Showing papers on "Switched-mode power supply published in 2022"
TL;DR: In this paper , a single-phase transformerless capacitorless power factor correction rectifier is proposed, and the proposed topology shares a common ground with the grid and the load.
Abstract: Transformer and electrolytic capacitors (Ecaps) in light-emitting diode (LED) drivers lead to increased cost and shortened lifespan. Therefore, eliminating the transformer and Ecaps of the LED driver can not only achieve a lightweight design but also extend the service life. In this article, a novel single-phase transformerless capacitorless power factor correction rectifier is proposed. The proposed topology shares a common ground with the grid and the load. Thus, the reduced common-mode current is obtained, and the demand for an isolation transformer is eliminated. In addition, this article presents a unidirectional active buffer circuit to isolate the pulsating power, and the capacitor of the buffer circuit is multiplexed as an output filter. Compared with similar works, a lower voltage on the decoupling capacitor, fewer power components, and a simple control unit are obtained. Then, the operation principle and switching modes as well as the parameter design and implementation of the control strategy are elaborated systematically. Finally, an 80-W experimental prototype is built, and the experimental results confirm the feasibility of the proposed rectifier by reaching the efficiency up to 97.1% and the power factor to 0.984 at a wide range of operating voltage.
9 citations
TL;DR: In this paper , a comprehensive review of the evolution of the application scope of linear-type DC-DC converters in the power supply context and the present research trends is provided, and the discussion focuses on supercapacitor-assisted low-dropout (SCALDO) regulator design and its scope in the portable device power management together with SCALDObased dual output and reduced switch designs.
Abstract: With the introduction of switch-mode power supplies (SMPS) in the mid-1970s, the efficiency of DC–DC conversion rose from 60 to 80% and SMPS became a popular power supply solution. However, linear regulators have not become obsolete. The modern power management system in portable devices supports a complex mix of DC–DC converters, combining switch-mode power supplies (SMPS), switched capacitor converters (SCCs), and linear regulators in the form of low-dropout regulators (LDOs). LDOs are used to supply low-voltage DC power rails with very low noise and high current slew rate capability, which are usually fed by the output rail of SMPS. This paper provides a comprehensive review of the evolution of the application scope of linear-type DC–DC converters in the power supply context and the present research trends. First, we review the context of linear DC–DC converters in detail, particularly in portable device power supplies. Then, the details of LDO regulators and their recent industry development and research trends are discussed. Then, the discussion focuses on supercapacitor-assisted low-dropout (SCALDO) regulator design and its scope in the portable device power management together with SCALDO-based dual output and reduced switch designs, and finally, the conclusions follow.
4 citations
TL;DR: In this paper , the authors present a different magnetic parts design and manufacturing techniques of power supplies, design and selection criteria of switching elements as well as the optimal design of control loops based on small-signal stability modeling and an appropriate stability criterion.
Abstract: Power quality in terms of power factor (PF), efficiency, and total harmonic distortions (THDs) is an important consideration in power supplies designed for 5G telecom servers. This paper presents a different magnetic parts design and manufacturing techniques of power supplies, design and selection criteria of switching elements as well as the optimal design of control loops based on small-signal stability modeling and an appropriate stability criterion. The designed telecom power supply consists of the power factor correction (PFC) stage to increase the input power factor and the isolated phase-shift pulse width modulation (PWM) zero-voltage switching (ZVS) DC–DC converter stage to regulate the supply voltage to the specified load value while maintaining a high conversion efficiency. A two-stage outdoor telecom power supply with a power rating of 2 kW was designed and fabricated on a printed circuit board (PCB). The distinct two-stage power components of the power supply were subjected to loss analysis. Furthermore, PSIM simulation and experiments were used to demonstrate the total harmonic distortions (THDs), voltage ripples, power efficiency, and PF performance of the supply current for the proposed power supply under various operating situations. This work produces an industrial high power density power supply with a high PF, low THD and high conversion efficiency which is suitable for telecom power server applications.
4 citations
16 May 2022
TL;DR: In this paper , the authors considered the types of interference in the power supply network of electronic means and proposed methods for increasing the noise immunity of electronic devices under the influence of interference through power supply.
Abstract: A frequent cause of violation of the noise immunity of modern electronic means are microsecond, nanosecond impulse interferences on the power supply network or dynamic voltage changes. These tasks are especially relevant for the elements of control systems of energy facilities. The paper considers the types of interference in the power supply network of electronic means. An analysis of the propagation of impulse noise has been carried out. Models have been developed and an analysis of the functioning of digital elements under the influence of interference through the power supply port has been carried out. The typical areas of functioning of electronic means are singled out depending on the amplitude and duration of interference in the power supply network. Methods for increasing the noise immunity of electronic means under the influence of interference through the power supply are considered.
4 citations
25 Mar 2022
TL;DR: In this paper , an instantaneous reactive power theory-based PI controller is implemented for power quality enhancement in 3-phase 4-wire power distribution systems to maintain IEEE 519 standard, eliminate voltage-related power quality problems and reduce harmonics in the three-phase distribution supply.
Abstract: The main cause of power quality troubles are failure supply & load unbalances. The power quality problems related to voltage point of common coupling and voltage deformation, voltage flicker, voltage unbalance, voltage sag and voltage expansion. Power quality problems in 3-phase 4-wire power distribution systems are failure of capacitor banks, noise, vibrations, and induction motors. This article describes how to use DSTATCOM to improve power quality in 3-phase 4-wire power distribution systems. An instantaneous reactive power theory-based PI controller is implemented in this manuscript for power quality enhancement. The main objectives of this paper are to maintain IEEE 519 standard, eliminate voltage-related power quality problems and reduce harmonics in the three-phase distribution supply.
4 citations
01 Mar 2022
TL;DR: In this article , a shunt FACTS device was used to improve the voltage profile by compensating reactive power with Thyristor based LC filter in conjunction with low DC link voltage VSC based Inverter.
Abstract: The power quality issues is the major concerned because of increase in power demand as well as integration of various distributed generation system in to the grid. This result in to the increase in voltage instability, power flow fluctuations, voltage flickers, voltage sag/swell and harmonics in the power system. This paper is based on a shunt FACTS device used to improve the voltage profile by compensating reactive power with Thyristor based LC filter in conjunction with low DC link voltage VSC based Inverter. Modelling and design of the said topology is presented in the paper. Also MATLAB simulation design with various type of load conditions are provided in the paper.
3 citations
TL;DR: In this paper , a one-phase direct current (DC) power supply equipped with a shunt active filter feature enabled the possibility of compensation (minimisation) of reactive and distortion power, generated by a group of loads, that was connected to the same power grid node as the power supply.
Abstract: This work focuses on the use of a one-phase direct current (DC) power supply equipped with a shunt active filter feature, which enabled the possibility of compensation (minimisation) of reactive and distortion power, generated by a group of loads, that was connected to the same power grid node as the power supply. A tuned inductor, which was included at the input of the controlled current source (constituting the main part of the power supply) allowed for an improvement in the quality of the compensation process, compared to a device with a fixed inductive filter This resulted in a visible reduction of the nonlinear distortions of the grid current. The improvement was made possible by extending the frequency response of the current source, which allowed to increase the dynamics of the current changes at the input of the power supply. This solution represents a new approach to such power devices. This work describes the principle of operation of the proposed converter solution and presents selected test results for a laboratory model of an electric system with this device.
3 citations
TL;DR: In this article , a hybrid active power filter (HAPF) was used to reduce the harmonics contained in the output of a UPS connected to a nonlinear load, and the results of the investigation demonstrate that the HAPF with the fuzzy logic current controller has reasonable performance, with a significant reduction in current THD down to 1.09%.
Abstract: UPS Uninterruptible power supply) is used as backup when the input source, usually the national grid, fails to give power to a load. In addition to the growing use of electronic power devices in industrial and residential systems, such as UPS, controlled rectifiers, SMPS (Switch Mode Power Supplies), and DC Converters, there is a serious problem caused by harmonics in AC mains, which lowers the power quality. Harmonics can cause a variety of problems, including sensitive equipment failure, resonance issues, heated wires, power loss, and inefficient distribution systems. A passive or active power filter could be used to reduce harmonics. However, passive filters are more difficult to design and are bulkier. With the advancement of power electronics, active power filters were developed, and the best combination of both was supplied in the form of hybrid active power filters (HAPF). This study shows an approach to minimizing the harmonics contained in the output of a UPS connected to a nonlinear load. Experiments with several UPS types have been conducted under various nonlinear loads, as well as charging and discharging of batteries, and the proposed technique significantly reduces harmonics in a system with a HAPFs (hybrid active power filter) based on a unique FLCC (fuzzy logic current controller). In this paper, we use a fuzzy logic controller to generate pulse width modulation (PWM) switching signals in a single-phase half-bridge HAPF. The operation of the proposed PWM-FLCC will be studied in a steady and transient state. Based on a connection between the uninterrupted power supply (UPS) supplying a single-phase power to a nonlinear load, different power filter topologies and a brief review of reference current extraction (RCE) methods used in this study were also included and the most common configurations have been compared with their advantages and disadvantages to ensure the right selection of the power filter for UPS connected with the nonlinear load. The results of the investigation demonstrate that the HAPF with the fuzzy logic current controller has reasonable performance, with a significant reduction in current THD down to 1.09%, as per IEEE-519 standard.
3 citations
TL;DR: In this article , a low-cost power supply topology based on a push-pull converter is illustrated, and a control strategy for the power supply voltage to ensure constant average power operation of the device is presented.
Abstract: Atmospheric-pressure plasma treatments for industrial and biomedical applications are often performed using Dielectric Barrier Discharge reactors. Dedicated power supplies are needed to provide the high voltage frequency waveforms to operate these nonlinear and time-dependent loads. Moreover, there is a growing technical need for reliable and reproducible treatments, which require the discharge parameters to be actively controlled. In this work, we illustrate a low-cost power supply topology based on a push–pull converter. We perform experimental measurements on two different reactor topologies (surface and volumetric), showing that open loop operation of the power supply leads to a temperature and average power increase over time. The temperature increases by ΔTvol~120 °C and ΔTsup~70 °C, while the power increases by ΔPvol~78% and ΔPsup~60% for the volumetric (40 s) and superficial reactors (120 s), respectively. We discuss how these changes are often unwanted in practical applications. A simplified circuital model of the power supply–reactor system is used to infer the physical relation between the observed reactor thermal behavior and its electrical characteristics. We then show a control strategy for the power supply voltage to ensure constant average power operation of the device based on real-time power measurements on the high voltage side of the power supply and an empirical expression relating the delivered power to the power supply output voltage. These are performed with an Arduino Due microcontroller unit, also used to control the power supply. In a controlled operation the measured power stays within 5% of the reference value for both configurations, reducing the temperature increments to ΔTvol~80 °C and ΔTsup~44 °C, respectively. The obtained results show that the proposed novel control strategy is capable of following the transient temperature behavior, achieving a constant average power operation and subsequently limiting the reactor thermal stress.
3 citations
TL;DR: In this article , a resistor-diode−diode (RDD) shaping method was proposed to solve the problem of poor quality of the output pulse power from a high-voltage pulse current power supply (HV-PCPS) for DBD applications.
Abstract: High-voltage pulse power supplies are key power input devices for the study and application of discharge plasma. A high-voltage pulse current power supply (HV-PCPS) with an energy storage pulse transformer based on flyback topology can output microsecond pulsewidths with high-power, ultrahigh voltage, and high reliability, which are suitable for most dielectric barrier discharge (DBD) plasma applications. However, during the process of DBD driven by an HV-PCPS based on an energy storage pulse transformer, the output pulse voltage waveform quality is poor, making it not suitable for stable discharge long-term operation. This article aims to solve the aforementioned problem and proposes a novel resistor–diode–diode (RDD) shaping method. Not only can this novel method solve the problem of poor quality of the output pulse power from the HV-PCPS, guaranteeing stable discharge for various DBD electrodes, it can also limit the maximum output voltage amplitude. This prevents overvoltage breakdown when the output terminal is in an open state or a light load state because the HV-PCPS is acting as a current source. This article also analyzes the effectiveness of an RDD branch when solving the problem in theory, and gives a detailed parameter design method. Finally, a 30-kV HV-PCPS prototype is built to verify the effectiveness of the proposed RDD pulse shaping method. The average pulse power output of the whole prototype is greatly improved, and it can achieve an average pulse power output of 1 kW. Furthermore, the electrode loads of different DBD reactors can be driven by this technology.
3 citations
TL;DR: In this article , the boost circuit of switching power supply is modelled and simulated, and it is concluded that the surge current and peak voltage generated by the boosting circuit are the main causes of electromagnetic interference.
Abstract: Switching power supply is easy to produce electromagnetic interference in the working process. Switching power supply is both an interference source and a sensitive device. Therefore, the boost circuit of switching power supply is modelled and simulated. It is concluded that the surge current and peak voltage generated by the boost circuit are the main causes of electromagnetic interference. According to the reasons, the electromagnetic interference suppression measures are proposed. It mainly includes three measures, namely adding capacitors at both ends of the switching tube, adding a filter circuit at the low voltage input end of the switching power supply, adding an optical coupler equipment and adding a common-differential-mode synthetic choke coil filter. These measures all effectively reduce the influence of electromagnetic interference of the switching power supply, and they are beneficial to improve the reliability of the switching power supply.
24 Feb 2022
TL;DR: In this paper , the authors evaluated the performance of the voltage stabilizer for different conditions of the active power filter in the case of the single phase as well as the loads considered to be linear and non-linear.
Abstract: There are different compensating devices which are generally used in the case filtering system of the active part, balancing of the load as well as the correction in the case of the power factor while the regulation of the voltage can also be possible. The active power filters are used for the purpose of the elimination of the harmonics system and used for the case of the connection for the series as well as the shunt system. The present work is related to the electrical distribution system where the increasing condition for the single phase is very sudden as well as the loads considered to be linear as well as the non-linear. The voltage stabilizer when used for the case of the overcoming certain drawbacks related to the distribution system then the development of the active power filter has very crucial role to be played. The objectives of the present work consisting evaluation of the performance related to the voltage stabilizer for the different conditions of the active power filter.
29 Mar 2022
TL;DR: In this article , the authors proposed a power system security model to prevent power system failure and uninterrupted power supply by using some monitoring and controlling methods and providing fine power to our smart grid this helps us to maintain electrical power and sustainability for reliable electrical power system.
Abstract: The Power System is a complex network of transmission lines, transformers, circuit breakers, and other components. As a result, the system must be safe and dependable from generation through distribution, with a continuous power supply required from generation to consumer end. However, several variables may disrupt the power supply regulations, resulting in system failure or collapse. When the system is functioning in a steady-state condition, the parameters Bus voltage and Frequency magnitude are kept within the level to prevent these defects and failures. This is known as power system security. The required power supply without interruptions saves our domestic equipment and increases the overall performance of the system. Some of the factors that affect our power system like Poor power quality can also cause issues with electromagnetic compatibility and noise. It can cause sophisticated protective systems to malfunction or fail, as well as key control and communication systems to malfunction or fail. Connected power demands, such as lighting, heating, and motors, are less sensitive to fluctuations in supply voltage and more sensitive to supply availability (absence of interruptions). Electronic or digital equipment, on the other hand, is more sensitive to fluctuations in supply voltages. Voltage fluctuation, harmonic distortion, voltage imbalance, flicker, supply interruptions, voltage sags, voltage swells, and transients, among other things, all have an impact on power quality. The system’s load requirement is completed by balancing between real and reactive power. various power problems are generated in the power grid because of long power transmissions such as trees falling on line, snowfall, lightning strokes, and flooding with the equipment failure may happen. These power problems may affect the technological power devices that generated faulty distribution systems with some electrical noise. Like hissing noise, corona, and line losses also. So, from this, we prevent system failure and uninterrupted power supply by using some monitoring and controlling methods and providing fine power to our smart grid this helps us to maintain electrical power and sustainability for a reliable electrical power system.
TL;DR: In this article , the high-frequency EMI source caused by high-speed switching in the three-phase half-bridge converter is analyzed and quantitatively calculated, and a general method for suppressing three kinds of interference and improving the EMC performance of the drive power is proposed based on the transfer function.
25 May 2022
TL;DR: In this article , the performance of a grid-connected hybrid solar photovoltaic power system with unified power flow controller was analyzed. But, the authors did not consider the use of FACT devices to improve power quality.
Abstract: Power is an essential source for daily life. The way time is progressing, our power needs also increasing but the main concern in the power system is the reliability of supply which means continuity of power supply with improved power quality. Maintaining the sinusoidal bus voltage at the requisite magnitude and frequency improves power quality, and FACT's (Flexible ac-transmission system) devices are effective in improving power quality with good power transfer capacity. Overvoltage, voltage swell, harmonic distortion, and other issues with power quality exist. The power quality issues can be addressed with the use of FACT devices. The paper's main goal is to analyse the performance of a grid- connected hybrid solar photovoltaic power system with UPFC (Unified Power Flow Controller). A grid-connected solar power system is configured with a PV array, boost converter, voltage source inverter (VSI), UPFC, etc. The Unified Power Flow Controller (UPFC) is utilised with MATLAB/SIMULINK to fix the power quality issue and improve the output of the proposed model.
TL;DR: In this article , a unipolar high voltage pulsed power supply with power factor correction (PFC) was proposed to reduce the impact of high voltage on the power grid by introducing feedback clamping diode and reverse current blocking diode in a flyback converter.
Abstract: A high voltage with a very short duration and fast rising time is beneficial to generate uniform and diffuse plasma in dielectric barrier discharge (DBD) loads, and a power supply with a high power factor (PF) can reduce the impact on the power grid. According to two requirements, a unipolar high voltage pulsed power supply with power factor correction (PFC) is proposed in this paper. The power supply consists of a unipolar pulse high voltage generating unit, a PFC unit, and a driving circuit. By introducing a feedback clamping diode and a reverse current blocking diode in a flyback converter, repetitive nanosecond pulses are generated in the unipolar pulse high voltage generating unit. Because a discontinuous current mode strategy is adopted in the PFC unit and the driving signal is shared by the two units, a compact structure of the power supply is achieved, and a high PF is obtained. To validate the proposed pulsed power supply, an experimental setup is built for a DBD excimer lamp. The results show that the proposed power supply has the capability of not only providing a unipolar nanosecond pulse high voltage for the DBD excimer lamp but also achieving PF close to 1 and total harmonic distortion of less than 24%.
TL;DR: In this article , a two-stage AC-AC power supply is designed to specifically handle the operation and performance improvements of the power system with highly inductive loads, which includes an input interleaved power factor correction (PFC) stage to improve the input power factor (PF) and regulate the DC bus voltage required for the second stage, which is a voltage source inverter (VSI) with an output low pass filter to adjust the load harmonics contents.
Abstract: In this paper, a two-stage AC-AC power supply is designed to specifically handle the operation and performance improvements of the power system with highly inductive loads. The proposed power supply scheme includes an input interleaved power factor correction (PFC) stage to improve the input power factor (PF) and regulate the DC bus voltage required for the second stage, which is a voltage source inverter (VSI) with an output low pass filter to adjust the load harmonics contents and regulate the load voltage and frequency to the specified AC load values. The small-signal models of the PFC and VSI stages are obtained, and optimal voltage and current control loops for both stages are designed based on the obtained models to improve the required system power performance and stability. PSIM simulation is used to examine the performance of the proposed power supply under various input-output operation conditions. This work achieves a 500VA, (180-260)V RMS Power supply with an input PF of 99%, better output voltage regulation, and a lower THD value for the purpose of supplying industrial inductive loads.
20 Mar 2022
TL;DR: In this paper , a gate driver power supply (GDPS) for SiC MOSFETs in medium-voltage power converters is presented, and the main design considerations of the proposed GDPS are high voltage isolation, low coupling capacitance, and regulated output voltage.
Abstract: In this paper, a gate driver power supply (GDPS) for SiC MOSFETs in medium-voltage power converters is presented. The main design considerations of the proposed GDPS are high voltage isolation, low coupling capacitance, and regulated output voltage. We present a design procedure for the transformer with an air gap to achieve the design objectives. Due to the air gap, the coupling factor of the proposed transformer is significantly lower than that of transformers without air gaps. Therefore, a series-series compensation network is designed to drive the loosely coupled magnetic link to achieve high-efficiency power transfer and stable output voltage. The input and output voltages of the proposed power supply are designed to be 24 VDC, and the rated output power is 20 W. The proposed transformer exceeds a partial discharge inception voltage of 20 kV RMS and has a coupling capacitance of 2.1 pF. The enclosure of the power supply is characterized by a creepage distance of 152 mm and a clearance distance of 80 mm between the input and output terminals of the GDPS. Compared with the commercially available high voltage gate driver power supply ISO5125I-120, the output power of the developed power supply is increased by four times, and the isolation strength doubled.
TL;DR: In this article , the authors proposed a new architecture for the hybrid distribution transformer (HDT) with a partially rated power converter connected in series with the existing distribution transformer, and the proposed system synthesizes a voltage vector to compensate for the voltage sags/swells and the grid voltage harmonics.
Abstract: This article proposes a new architecture for the hybrid distribution transformer (HDT) with a partially rated power converter connected in series with the existing distribution transformer. The proposed single-phase system is constructed by adding a three-legged power converter in series to the existing transformer's primary side. Here, the way the converter is connected to the transformer's two taps provides the following advantages: 1) It is possible to reduce the power converter's power rating, and 2) An additional current loop, which gives a degree of freedom, is added. For better power quality, the proposed system synthesizes a voltage vector to compensate for the voltage sags/swells and the grid voltage harmonics. Furthermore, it improves the grid's power factor to increase the power transmission efficiency. The proposed system meets the needs of smart grids in terms of resilience. The configuration, control strategies, analysis, and activation/deactivation sequence of the proposed system are discussed in this article. Real-scale simulations and lab-scale experiments were performed to validate the proposed system, and the system's effectiveness was verified through the obtained results.
TL;DR: In this article, an equivalent model of the bilateral power supply system is established, and it is found that the balanced power is mainly affected by the phase deviation of the feeder voltage of the two adjacent traction substations.
TL;DR: In this paper , the design of an IC+MOS switching power supply, including EMI filter circuit, rectifier filter, self-excited power supply circuit, switching converter, output filter circuit and control circuit, is described.
Abstract: This paper describes the design of an IC+MOS switching power supply, including EMI filter circuit, rectifier filter circuit, self-excited power supply circuit, switching converter, output filter circuit and control circuit, and the parameters and design process involved in each part of the circuit are analyzed. The rationality of the design is verified by simulation and circuit construction, and the stable output of voltage is realized, the core components are domestic components.
01 Jan 2022
TL;DR: In this article , the effects of using capacitor for VAR compensation to the quality of electrical power supply and distribution system based on simulation run with Matlab Simulink software are analyzed.
Abstract: Electrical load in industrial sector is mainly inductive that requires large amount of reactive power supply. Large reactive power consumption may give problems to electrical power supply and distribution system such as lower power factor, higher power loss for both electrical power distribution system and all electrical power devices connected in it, and higher voltage drop in electrical power distribution system. Therefore, a measure known as reactive power compensation (VAR compensation) by connecting power capacitor as reactive power source need to be taken. However, VAR compensation measure may give other problems to the electrical power supply and distribution system. This paper describes effects of using capacitor for VAR compensation to the quality of electrical power supply and distribution system based on simulation run with Matlab Simulink software. Three different kinds of VAR compensation method are analysed i.e., connecting a small capacitor for each inductive load, connecting a large capacitor at the electrical power supply side in which its reactive power flow is controlled by SVC (static VAR compensator) method and connecting a large capacitor at the electrical power supply side in which its reactive power flow is controlled by TSC (thyristor switched capacitor) method. Analysis results show that all the three VAR compensation methods successfully improve or increase power factor of the electrical power supply and distribution system close to unity. However, both the SVC and TSC VAR compensation methods increase harmonic content of voltage and current of the electrical power supply and distribution system as indicated by its high total harmonic distortion (THD) value. On contrary, the VAR compensation method by connecting a small capacitor for each inductive load brings no effect on increasing of harmonic content of voltage and current of the electrical power supply and distribution system.
26 Aug 2022
TL;DR: In this article , the performance of a grid-connected hybrid PV power system with UPFC was examined by MATLAB, where the main concern of power is continuity of supply and its quality.
Abstract: Power is an essential source for daily life. The main concern of power is continuity of supply and its quality. The FACT devices are a critical component of a reliable power supply with better power quality. These devices adjust for overvoltage, voltage swell, harmonic distortion, and so on. The performance of a grid-connected hybrid PV power system with UPFC is examined by MATLAB.
21 Apr 2022
TL;DR: In this paper , a detailed performance investigation of the adaptive hysteresis band controller-based shunt active power filter (SAPF) is presented in Matlab/Simulink platform and the simulation results are analyzed considering harmonic reduction, power factor correction and also the reactive power compensation.
Abstract: A significant observation is concluded after revising numerous published research articles that there has been a noteworthy rise in the utilization of power electronics based converter systems for different purposes such as grid connected distributed generation systems, high voltage DC (HVDC) transmission systems, adjustable speed drives (ASD), flexible AC transmission (FACT) systems, electric arc furnaces, industrially used uninterrupted power supply (UPS) systems and also many other industrial applications. The above-mentioned applications utilizes the nonlinear power electronic converter systems either as a load or as an interface. The nonlinear loads are accountable for the injection of reactive power and harmonic currents to the utility grid thereby largely affecting the amount of grid voltage and the power quality. The active power filters are capable of compensation of reactive power, voltage and current harmonics, control of the terminal voltage, restrain the flicker, and improvement of the voltage balance in the three phase grid systems. In this research work, a detailed performance investigation of the adaptive hysteresis band controller-based shunt active power filter (SAPF) is presented in Matlab/Simulink platform and the simulation results are analyzed considering harmonic reduction, power factor correction and also the reactive power compensation.
TL;DR: In this article , the authors presented a computer simulation model of the unity power factor uninterruptible power supply (UPS) topology using single-phase matrix converter (SPMC) that focuses on the switching integration for both rectifier and inverter operations.
Abstract: This paper presents a computer simulation model of the unity power factor uninterruptible power supply (UPS) topology using single-phase matrix converter (SPMC) that focuses on the switching integration for both rectifier and inverter operations. The proposed integrated switches capable of controlling the SPMC to operate as a rectifier operation to charge the DC battery during the normal operation and to switch the SPMC to operate as an inverter during power outage conditions continuously and instantaneously using a single power converter circuit. The use of a single power converter circuit can solve the typical UPS system that requires at least two separate power converter circuits, thus contributing to the higher power semiconductor losses and complicated control circuits. With the proposed circuit topology, it can improve the power density of the power electronics converter system resulting in low power losses. The active power filter (APF) function has been used to improve the supply current waveform to follow the shape of the sinusoidal reference current to be in phase with the supply voltage waveform, thus reduce the total harmonic distortion (THD) level and improve the power factor. To verify the proposed operation, the selected simulation results are presented, and the proposed work has been done through the MATLAB/Simulink.
08 Jun 2022
TL;DR: In this paper , the mechanisms of the coordination are described in detail and examples of reactive power dispatch algorithms reveal the potential for reactive power delivery to high voltage system as a consequence of the reactive power sharing between individual generating modules.
Abstract: In the recent years, distributed generation modules are penetrating into the low voltage and medium voltage distribution system. In medium voltage systems, however, the more emphasis is on the coordination of voltage control due to the impact to the low voltage systems, and reactive power over distribution transformer due to the impact to high voltage systems. Throughout the paper, the mechanisms of the coordination are described in detail and examples of reactive power dispatch algorithms reveal the potential of reactive power delivery to high voltage system as a consequence of the reactive power sharing between individual generating modules.
TL;DR: In this paper , a two-stage factorized power architecture (FPA) dc-dc converter is proposed, which caters to applications that require high efficiency, high power density, low ripple, and high dynamic response of space-borne low-voltage and high-current power supply.
Abstract: In this article, we propose a two-stage factorized power architecture (FPA) dc–dc converter, which caters to applications that require high efficiency, high power density, low ripple, and high dynamic response of space-borne low-voltage and high-current power supply. The first-stage 48 V intermediate bus converter (IBC) adopts the six-phase interleaving magnetic integration buck converter (IMIBC). A new array high symmetry multi-phase coupled inductor (CI) is constructed, and a general zero-voltage switching (ZVS) control strategy is proposed. The designed IBC provides 2.4 kW power with a density of up to 1400 W/in3 and efficiency up to 97.15%. The second-stage point of load converter (POLC) adopts the four-phase interleaving magnetic integration LLC dc/dc transformer (DCX). A new method of current sharing, which is based on the inverse coupling resonant inductor, is proposed. This method yields good current sharing under a 15% mismatch of resonance parameters. A highly symmetrical four-phase resonant CI and a four-phase magnetic integration transformer are developed; the design of magnetic components is optimized by constructing a high-precision magnetic circuit mode. The designed POLC has a power density of up to 700 W/in3 and an efficiency of up to 97.1%. Finally, the experimental prototype is fully tested against a similar type of Vicor’s products. According to the results, the power supply designed in this article has several benefits with regard to efficiency, power density, transient response speed, and ripple.
TL;DR: In this paper , the authors considered the problem of the efficiency of phase voltage regulation on the capacitor battery to use it as a source to compensate for reactive power, and the results of the study are presented, which justify the effectiveness of the technique for obtaining a dynamic source of reactive power based on the use of a variable voltage regulator with a capacitive load.
Abstract: The tasks of dynamic compensation of reactive power are solved by means of flexible AC transmission systems using power electronics devices. The object of this study is a variable voltage regulator with a capacitive load. This paper considered the problem of the efficiency of phase voltage regulation on the capacitor battery to use it as a source to compensate for reactive power. The results of the study are presented, which justify the effectiveness of the technique for obtaining a dynamic source of reactive power based on the use of a thyristor voltage regulator with a capacitive load. A comparative study of two regimes of the regulator was carried out: the phase-controlled mode of closing fully controlled semiconductor gates and the phase-controlled mode for opening single-core semiconductor gates. Analytical expressions for angular characteristics of power according to the main harmonics are derived. It is shown that under the first mode the current through the capacitor is capacitive, which makes it possible to obtain a thyristor-adjustable capacitor battery for dynamic compensation of reactive power in power supply systems. It was found that under the second mode, simultaneously with the regulation of reactive power, there is a phenomenon of consumption from the active power supply network according to the main harmonics. This means that the regulation of current through an ideal capacity using ideal phase-controlled semiconductor gates is accompanied by the consumption of the active component of the current from the power supply network. The resulting component of active power in the electrical circuit without active resistances is proposed to be called "active artificial shear power". The results have been confirmed by studies on virtual models
TL;DR: In this paper , a low-voltage DC-AC soft-switching full-bridge topology, with an innovative, driven technique to achieve a zerovoltage transition, is presented and discussed.
Abstract: The auxiliary power supply in a power converter is a key topic in the optimization of the converter’s low-voltage electronic circuit performance. In this article, a low-voltage DC-AC soft-switching full-bridge topology, with an innovative, driven technique to achieve a zero-voltage transition, is presented and discussed. The full-bridge converter drives a high-frequency transformer (called the main transformer) that on the secondary side, distributes an AC voltage and current to the several electronic circuit’s supplies. Every power supply is composed of an HF transformer (called load transformer) that converts the AC secondary voltage of the main transformer to the voltage and current levels requested by the electronic circuit. In this paper, the operating conditions are first investigated by several simulation results. Furthermore, an actual DC-DC power converter is used as a workbench for an experimental investigation of the effectiveness of the proposed auxiliary DC-AC soft-switching topology, and the AC distribution approach, to realize the several points of load power supply requested. Finally, the advantages and drawbacks of this auxiliary power supply solution are critically discussed, providing guidelines for the power converter designer.
01 May 2022
TL;DR: In this article , an equivalent model of the bilateral power supply system is established, and it is found that the balanced power is mainly affected by the phase deviation of the feeder voltage of the two adjacent traction substations.
Abstract: Bilateral power supply can improve the power supply capacity and extend the power supply distance in high-speed railway traction power supply system (TPSS). However, the balanced power generated after bilateral power supply hinders its widespread application. In order to reduce or eliminate the balanced power, in this paper, an equivalent model of the bilateral power supply system is established, and it is found that the balanced power is mainly affected by the phase deviation of the feeder voltage of the two adjacent traction substations. The influence of balanced power on the node voltage and power flow distribution of the power system is analyzed with the IEEE 14-bus test system, and then a new voltage phase shifter suitable for TPSS is proposed to reduce the balanced power. The simulation and case study show that the proposed phase shifter can effectively adjust the phase difference and significantly reduce the balanced power, which lays a foundation for the implementation of bilateral power supply in electrified railway.