Showing papers in "International Journal of Power Electronics and Drive Systems in 2014"
TL;DR: In this article, a multilevel inverter with reduced number of switches is proposed for a high power application and it is built with three Dc sources and six switches, and the results are validated through the harmonic spectrum of FFT window by using Matlab/simulink.
Abstract: In recent day’s Multilevel inverter (MLI) technologies become a incredibly main choice in the area of high power medium voltage energy control. Though multilevel inverter has a number of advantages it has drawbacks in the vein of higher levels because of using more number of semiconductor switches. This may leads to vast size and price of the inverter is very high. So in order to overcome this problem the new multilevel inverter is proposed with reduced number of switches. The proposed method is well suited for a high power application and it built with three Dc sources and six Switches. Multi carrier pwm technique is used for sine wave generation. The results are validated through the harmonic spectrum of the FFT window by using Matlab/simulink. The result of the proposed MLI is compared with the conventional MLI and other seven level existing topologies. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6089
34 citations
TL;DR: In this article, the authors proposed a novel method using the artificial neural network (ANN) for the improvement of the performances of a photovoltaic system composed of a PV array, an inverter, a motor asynchronous and a centrifugal pump.
Abstract: The article proposes a novel method using the artificial neural network (ANN) for the improvement of the performances of a photovoltaic system composed of a photovoltaic (PV) array, an inverter, a motor asynchronous and a centrifugal pump. For this type of system, different optimization strategies have been proposed to improve the over of the PV system efficiency, i.e. the PV generator is forced to operate at its maximum power point “MPPT”, generally, by the insertion of DC/DC boost converter between the photovoltaic array and the inverter. In this work we propose an approach, where optimization is realized without need adding a DC/DC converter to the chain, using field-oriented control through the monitoring of the voltage-fed inverter frequency. The motor is also ensured in all insolation conditions. A multilayer feed forward perception type NN is proposed for MPPT control, and the back-propagation algorithm is used for training. The performances of the drive with ANN-based MPPT are excellent. The maximum power point (MPP) can be easily obtained to frequency-controlled drive. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5875
33 citations
TL;DR: In this article, the form and function of modular multilevel inverters (MMI), with their different topologies, modulation, modeling and control schemes, have been investigated in a comprehensive manner with existing literature available.
Abstract: This article is devoted to the Multi-level inverters review and in particular to the form and function of modular multilevel inverters (MMI), with their different topologies, modulation, modeling and control schemes Detailed analysis with their functions of MMI has been made in comprehensive manner with existing literature available till date. All existing methods are compared in detail with proposal for the best methods available. The article has made strategic conclusions on MMI to make the system more robust in operation with less complexity in design and control. DOI: http://dx.doi.org/10.11591/ijpeds.v4i1.5020
29 citations
TL;DR: In this article, the adaptative backstepping control approach for a permanent magnet synchronous motor drive is discussed and analyzed using FPGA. And the experimental results carried from a prototyping platform are given to illustrate the efficiency and the benefits of the proposed approach and the various stages of implementation of this structure in FPGAs.
Abstract: In this paper, we present a new contribution of FPGAs (Field-Programmable Gate Array) for control of electrical machines. The adaptative Backstepping control approach for a permanent magnet synchronous motor drive is discussed and analyzed. We present a Matlab&Simulink simulation and experimental results from a benchmark based on FPGA. The Backstepping technique provides a systematic method to address this type of problem. It combines the notion of Lyapunov function and a controller procedure recursively. First, the adaptative and no adaptative Backstepping control approach is utilized to obtain the robustness for mismatched parameter uncertainties. The overall stability of the system is shown using Lyapunov technique. The simulation results clearly show that the proposed scheme can track the speed reference. Secondly, some experimental results are demonstrated to validate the proposed controllers. The experimental results carried from a prototyping platform are given to illustrate the efficiency and the benefits of the proposed approach and the various stages of implementation of this structure in FPGA. DOI: http://dx.doi.org/10.11591/ijpeds.v4i1.4645
23 citations
TL;DR: In this article, the authors compared the performance of Sine Pulse Width Modulation (SPWM), Third Harmonic Injection (THIPWM), and Space Vector Pulse Width modulation (SVPWM) for three-phase voltage source inverters.
Abstract: Pulse width modulation (PWM) technique is one of the vital issues for power electronic circuit control. A number of Pulse width modulation (PWM) techniques are increasingly applied in many new industrial applications that require superior performance. The most widely applied PWM technique for three-phase voltage source inverters are Sine Pulse Width Modulation (SPWM), Third Harmonic Injection Pulse Width Modulation (THIPWM) and Space Vector Pulse Width Modulation (SVPWM). SPWM is the most simple modulation technique that can realize easily in analog circuit. However, it has some drawbacks such as higher total harmonic distortion (THD), lower switching frequency and not capable in over modulation region. THIPWM and SVPWM both provide better THD compared to SPWM. SVPWM shows lower THD in over modulation region and in high frequency application compared to THIPWM. These three techniques are discussed, analyzed and compared in terms of modulation index, switching frequency and inverter input voltage in this paper. The modeling and simulation for all PWM techniques have been done by using MATLAB/SIMULINK and Origin 6.1. From the simulation results, SVPWM shows the best performance and meet IEEE 519 standard of current harmonics level. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5833
22 citations
TL;DR: In this paper, a combined operation of UPQC and PV-ARRAY is designed, which is composed of series and shunt inverters connected back to back by a dc-link to which pvarray is connected.
Abstract: In this paper, the design of combined operation of UPQC and PV-ARRAY is designed. The proposed system is composed of series and shunt inverters connected back to back by a dc-link to which pv-array is connected. This system is able to compensate voltage and current related problems both in inter-connected mode and islanding mode by injecting active power to grid. The fundamental aspect is that the power electronic devices (PE) and sensitive equipments (SE) are normally designed to work in non-polluted power system, so they would suffer from malfunctions when supply voltage is not pure sinusoidal. Thus this proposed operating strategy with flexible operation mode improves the power quality of the grid system combining photovoltaic array with a control of unified power quality conditioner. Pulse Width Modulation (PWM) is used in both three phase four leg inverters. A Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality improvement by reducing the distortions in the output power. The simulated results were compared among the two controller’s strategies With pi controller and fuzzy logic controller. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6184
20 citations
TL;DR: In this article, the Direct Rotor Field-Oriented Control (DRFOC) was used to control the motor by converting the unbalanced SPIM equations to the balanced equations.
Abstract: Nowadays, Field-Oriented Control (FOC) strategies broadly used as a vector based controller for Single-Phase Induction Motors (SPIMs). This paper is focused on Direct Rotor FOC (DRFOC) of SPIM. In the proposed technique, transformation matrices are applied in order to control the motor by converting the unbalanced SPIM equations to the balanced equations (in this paper the SPIM with two different stator windings is considered). Besides this control technique, a method for speed estimation of SPIM based on Extended Kalman Filter (EKF) to achieve the higher performance of SPIM drive system is presented. Simulation results are provided to demonstrate the high performance of the presented techniques. DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6098
19 citations
TL;DR: In this article, the authors proposed a new topology of cascaded multilevel inverter, with considerable reduction in the number of switches and DC voltage sources, without sacrificing the quality output of the inverter.
Abstract: This paper introduces new topology of cascaded multilevel inverter, with considerable reduction in the number of switches and DC voltage sources. The proposed topology is based on asymmetrical multilevel inverter which produces 21 levels of output with the use of 11 unidirectional switches, 3 diodes and 4 DC voltage sources. The advantages of this topology are reduction in the number of switches (2 nos.) and gate driver circuits (2 nos.), reduction in the number of DC sources (2 nos.) also cost, complexity, and space required for hardware is reduced without sacrificing the quality output of the inverter. To reduce the THD further Level shifting SPWM techniques such as PD, POD & APOD are used and comparison is shown on the basis of THDs obtained from the above SPWM techniques. Frequency of carrier waves is 1KHz, and modulation index is 1.0. To validate the proposed topology the circuit is simulated and verified by using MATLAB/Simulink. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.5810
17 citations
TL;DR: In this paper, an adaptive sliding mode control system with an adaptive switching gain is proposed instead of the speed PI controller, which causes the proposed speed sensorless RFOC drive system to become insensitive to uncertainties such as load disturbances and parameter variations.
Abstract: This paper presents a technique for speed sensorless Rotor Flux Oriented Control (RFOC) of 3-phase Induction Motor (IM) under open-phase fault (unbalanced or faulty IM). The presented RFOC strategy is based on rotational transformation. An adaptive sliding mode control system with an adaptive switching gain is proposed instead of the speed PI controller. Using an adaptive sliding mode control causes the proposed speed sensorless RFOC drive system to become insensitive to uncertainties such as load disturbances and parameter variations. Moreover, with adaptation of the sliding switching gain, calculation of the system uncertainties upper bound is not needed. Finally, simulation results have been presented to confirm the good performance of the proposed method.
17 citations
TL;DR: In this article, a simple SVPWM algorithm for diode clamped three level inverters based on standard two-level SVPW was presented, which can easily determine the location of reference vector, calculate the on-times, and selection of switching states.
Abstract: Multilevel inverters are increasingly being used in high-power medium voltage industrial drive applications due to their superior performance compared to conventional two-level inverters. Thre are a number of Pulse width modulation (PWM) techniques applied in recent years. The most widely applied PWM techniques are Sine Pulse Width Modulation (SPWM) and Space Vector Pulse Width Modulation (SVPWM). SPWM is the most simple modulation technique that can realize easily in analog circuit. However, it has some drawbacks such as higher total harmonic distortion (THD), lower effective DC utilization and lower switching frequency. Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. The complexity is due to the difficulty in determining the reference vector location, on times calculation, and switching states selection. This paper presents a simple SVPWM algorithm for diode clamped three level inverters based on standard two-level SVPWM which can easily determine the location of reference vector, calculate the on-times, the selection of switching states. Three level diode clamped inverter (3LDCI) using space vector modulation technique has been modeled and simulated using MATLAB/SIMULINK and Origin 6.1 with a passive R-L load that can be extended to any level. Simulation results are presented to verify the proposed SVPWM control in terms of THD. The results are compared with conventional sinusoidal pulse width modulation (SPWM) where SVPWM shows better performance than SPWM in terms of THD. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6038
17 citations
TL;DR: In this article, the authors proposed a single-switch bridgeless boost power factor correction (PFC) converter to achieve high efficiency in low cost, which utilizes only one active switching device for PFC operation as well as expecting higher efficiency than typical boost PFC converters.
Abstract: This paper proposes the single-switch bridgeless boost power factor correction (PFC) converter to achieve high efficiency in low cost. The proposed converter utilizes only one active switching device for PFC operation as well as expecting higher efficiency than typical boost PFC converters. On the other hand, the implementation cost is less than traditional bridgeless boost PFC converters, in where two active switching deivces are necessary. The operational principle, the modeling, and the control scheme of the proposed converter are discussed in detail. In order to verify the operation of the proposed converter, a 500W switching model is built in PSIM software package. The simulation results show that the proposed converter perfectly achieves PFC operation with only a single active switch. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5558
SIDI1
TL;DR: In this paper, a virtual flux direct power control-space vector modulation combined with backstepping control for three-phase five-level neutral point clamped shunt active power filter is proposed.
Abstract: This paper proposes a virtual flux direct power control-space vector modulation combined with backstepping control for three-phase five-level neutral point clamped shunt active power filter. The main goal of the proposed active filtering system is to eliminate the unwanted harmonics and compensate fundamental reactive power drawn from the nonlinear loads. In this study, the voltage-balancing control of four split dc capacitors of the five-level active filter is achieved using five-level space vector modulation with balancing strategy based on the effective use of the redundant switching states of the inverter voltage vectors. The obtained results showed that, the proposed multilevel shunt active power filter with backstepping control can produce a sinusoidal supply current with low harmonic distortion and in phase with the line voltage. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5621
TL;DR: In this article, the authors present a review on the different models of UPFC used in recent years and give sets of information for each model of the UPFC in AC transmission. And then they compare and feature of each model are examined.
Abstract: Unified Power Flow Controller (UPFC) is one of the most intriguing and, potentially, the most versatile classes of Flexible AC Transmission Systems (FACTS) devices. The UPFC is a device which can control simultaneously tree parameters line impedance, voltage, phase angle and dynamic compensation of AC power system. In order to analyse its true effects on power systems, it is important to model its constraints, due to various ratings and operating limits. This paper reviews on the different models of UPFC used in recent years and gives sets of information for each model of the UPFC in AC transmission. Then the different models are compared and features of each model are examined.
TL;DR: In this paper, a new single-phase structure for multilevel voltage source inverter is proposed which can generate a large number of levels with reduced number of IGBTs, gate driver circuits and diodes.
Abstract: Multilevel inverters with more number of levels can produce high quality voltage waveforms. In this paper, a new single-phase structure for multilevel voltage source inverter is proposed which can generate a large number of levels with reduced number of IGBTs, gate driver circuits and diodes. Three algorithms for determination of dc voltage sources’ magnitudes are presented which provide odd and even levels at the output voltage waveform. A comparison is presented between proposed multilevel inverter and conventional cascade topology. The proposed topology is analyzed by the experimental and simulation results. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6218
TL;DR: In this paper, a doubly fed induction generator based on grid-side and rotor-side converter control is presented for variable-speed wind turbine operation in grid connected mode for variable speed wind operation.
Abstract: Wind turbine WT occupies gradually a large part in world energy market, Doubly fed induction generator DFIG is mostly used in WT, it allow highly flexible active and reactive power generation control. This paper presents dynamic modeling and simulation of a doubly fed induction generator based on grid-side and rotor-side converter control. The DFIG, grid-side converter, rotor-side converter, and its controllers are performed in MATLAB/Simulink software. Dynamic response in grid connected mode for variable speed wind operation is investigated. Simulation results on a 3 MW DFIG system are provided to demonstrate the effectiveness of the proposed control strategy during variations of active and reactive power, rotor speed, and converter dc link voltage.
TL;DR: In this paper, a quasi-Z-Source DC-DC Converter (qZSC) with capability of dividing its output voltage to the same voltages and tracking maximum power point is proposed.
Abstract: This paper proposes a new structure for photovoltaic (PV) arrays with a new inverter topology. A quasi-Z-Source DC-DC Converter (qZSC) with capability of dividing its output voltage to the same voltages and tracking maximum power point is proposed. The Proportional-Integral Incremental Conductance (PI-IncCond) method is used for maximum power point tracking (MPPT). Description of proposed structure along with detailed simulation results that verify its feasibility are given to demonstrate the availability of the proposed system by MATLAB/Simulink software.
TL;DR: In this article, the form and function of modular multilevel converters with their modulation, design considerations, balancing issues, control schemes, and applications are discussed in a comprehensive manner.
Abstract: This article is devoted to the Multi-level converters review and specifically the form and function of modular multilevel converter (MMC) with their modulation, design considerations, balancing issues, control schemes, and applications. This article intends to make a detailed analysis of MMC with their controller related issues in comprehensive manner. It is an approach for MMC design and modulation schemes in easy manner. Furthermore, a five level MMC have been designed with optimal controller and verified by its experimental results and explored. In addition to that, this approach draws strategic conclusions on MMC towards making the system more robust in operation, less complex in design and control. DOI: http://dx.doi.org/10.11591/ijpeds.v4i3.5914
TL;DR: In this article, a single-phase 11-level (5 H-bridges) cascade multilevel DC-AC grid-tied inverter is presented, where each inverter bridge is connected to a 200 W solar panel.
Abstract: Photovoltaic energy is a wide kind of green energy. A high performance on these systems is needed to make the most of energy produced by solar cells. Also, there must be a constant adaptation due to the continuous variation of power production. Control techniques for Power Converters like the MPPT algorithm (Maximum Power Point Tracking) present very good results on photovoltaic chains. Nevertheless, losses on power elements reduce global performance and the voltage/current adaptation is not always possible. This paper presents a single-phase 11-level (5 H-bridges) cascade multilevel DC-AC grid-tied inverter. Each inverter bridge is connected to a 200 W solar panel. OPAL-RT lab was used as the hardware in the loop (HIL) real-time control system platform where a Maximum Power Point Tracking (MPPT) algorithm was implemented based on the inverter output power to assure optimal operation of the inverter when connected to the power grid as well as a Phase Locked Loop (PLL) for phase and frequency match. A novel SPWM scheme is proposed in this paper to be used with the solar panels that can account for voltage profile fluctuations among the panels during the day. Simulation and experimental results are shown for voltage and current during synchronization mode and power transferring mode to validate the methodology for grid connection of renewable resources. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6156
TL;DR: In this article, a model of the wind turbine with permanent magnet generator (PMSG) and its associated controllers is presented, the increase of wind power penetration in power systems has meant that conventional power plants are gradually being replaced by wind farms.
Abstract: In this paper, a model of the wind turbine (WT) with permanent magnet generator (PMSG) and its associated controllers is presented, The increase of wind power penetration in power systems has meant that conventional power plants are gradually being replaced by wind farms. In fact, today wind farms are required to actively participate in power system operation in the same way as conventional power plants. In fact, power system operators have revised the grid connection requirements for wind turbines and wind farms, and now demand that these installations be able to carry out more or less the same control tasks as conventional power plants. For dynamic power system simulations, the PMSG wind turbine model includes an aerodynamic rotor model, a lumped mass representation of the drive train system and generator model. In this paper we propose a model with an implementation in MATLAB / Simulink, each of the system components off-grid small wind turbines. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.4859
TL;DR: In this article, the authors proposed a hybrid AC/DC microgrid in alliance with Photo Voltaic (PV) energy, wind energy and Proton Exchange Membrane (PEM) fuel cells.
Abstract: This paper proposes a Hybrid AC/DC Microgrid in alliance with Photo Voltaic (PV) energy, Wind Energy and Proton Exchange Membrane (PEM) Fuel cells Microgrids are becoming increasingly attractive to the researchers because of the less greenhouse gases, low running cost, and flexibility to operate in connection with utility grid The Hybrid AC/DC Microgrid constitutes independent AC and DC subgrids, where all the corresponding sources and loads are connected to their respective buses and these buses are interfaced using an interfacing converter The Hybrid AC/DC Microgrid increases system efficiency by reducing the multiple reverse conversions involved in conventional RES integration to grid A Small Hybrid AC/DC Microgrid in grid connected mode was modeled and simulated in MATLAB-SIMULINK environment The simulation results proves the stable operation considering the uncertainty of generations and loads DOI: http://dxdoiorg/1011591/ijpedsv5i26188
TL;DR: In this paper, a wind turbine simulator based on a separately excited direct current (DC) motor was used as a prime mover for Permanent Magnet Synchronous Machine (PMSM) in order to extract maximum power from the wind.
Abstract: In this paper, a Wind Turbine Emulator (WTE) based on a separately excited direct current (DC) motor is studied. The wind turbine was emulated by controlling the torque of the DC motor. The WTE is used as a prime mover for Permanent Magnet Synchronous Machine (PMSM). In order to extract maximum power from the wind, PI and Fuzzy controllers were tested. Simulation results are given to show performance of proposed fuzzy control system in maximum power points tracking in a wind energy conversion system under various wind conditions. The strategy control was implemented in simulation using MATLAB/Simulink. DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5809
TL;DR: Decouple PI control for output active and reactive powers which is the common control technique for power converter of Doubly Fed Induction Generator (DFIG) and fuzzy logic control of DFIG wind turbine is presented and is compared with PI controller.
Abstract: In this paper, decouple PI control for output active and reactive powers which is the common control technique for power converter of Doubly Fed Induction Generator (DFIG) is presented. But there are some disadvantages with this control method like uncertainty about the exact model, behavior of some parameters or unpredictable wind speed and tuning of PI parameters. To overcome the mentioned disadvantages a fuzzy logic control of DFIG wind turbine is presented and is compared with PI controller. To validate the proposed scheme, simulation results are presented, these results showed that the performance of fuzzy control of DFIG is excellent and it improves power quality and stability of wind turbine compared to PI controller. The Fuzzy logic controller is applied to rotor side converter for active power control and voltage regulation of wind turbine. The entire work is carried out in MATLab/Simulink. Different faulty operating conditions are considered to prove the effective implementation of the proposed control scheme. DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.5966
TL;DR: In this paper, a comparative analysis of speed control of brushless DC motor (BLDC) drive fed with conventional two-level, three and five level diode clamped multilevel inverter (DC-MLI) is presented.
Abstract: This paper presents a comparative analysis of speed control of brushless DC motor (BLDC) drive fed with conventional two-level, three and five level diode clamped multilevel inverter (DC-MLI). The performance of the drive system is successfully evaluated using Fuzzy Logic (FL) based speed controller. The control structure of the proposed drive system is described. The speed and torque characteristic of conventional two-level inverter is compared with the three and five-level multilevel inverter (MLI) for various operating conditions. The three and five level diode clamped multilevel inverters are simulated using IGBT’s and the mathematical model of BLDC motor has been developed in MATLAB/SIMULINK environment. The simulation results show that the Fuzzy based speed controller eliminate torque ripples and provides fast speed response. The developed Fuzzy Logic model has the ability to learn instantaneously and adapt its own controller parameters based on disturbances with minimum steady state error, overshoot and rise time of the output voltage. DOI: http://dx.doi.org/10.11591/ijpeds.v4i1.4745
TL;DR: In order to minimize losses of the converter, a new high efficiency version of a Step-Up structure based on a commutation element integrating a low V dsmax voltage MOSFET and very low R dson is designed and realized.
Abstract: Considering the optimization of a photovoltaic system, several studies show the advantage in the choice of a distributed structure. For such structures small power converters such as the boosts and buck converters appear as most appropriate. We have analysed the efficiency of small power boost-converters especially dedicated for photovoltaic energy conversion systems working in the middle and high voltage ranges. The setup studied is a photovoltaic generator connected to an AC grid working in 230 Volts via an inverter. More over, we considered the possibility of multiple electrical energy sources as photovoltaic, wind systems in the same energy production system, which obliged an adaptive converter structure. We evaluated the losses in the various stages of a boost converter and point out the importance of the power MOSFET used as the commutation element. New transistors databases obtained from manufacturers show the nonlinear dependency between the resistance drain-source when passing, R dson and the maximum rating voltage when the transistor is off, V dsmax , for all transistor families. Thus nonlinear dependency induces a huge increase of losses with the voltage in the MOSFET, and as a direct consequence in the converter the more as V dsmax is higher. In order to minimize losses of the converter we have designed and realized a new high efficiency version of a Step-Up structure based on a commutation element integrating a low V dsmax voltage MOSFET and very low R dson . DOI: http://dx.doi.org/10.11591/ijpeds.v3i4.4484
TL;DR: In this article, a different topology of H-bridge based multilevel current source inverter is presented, where the number of power switching devices and isolated gate drive circuits can be reduced.
Abstract: Th is paper presents a different topology o f H-bridge based multilevel current-source inverter (CSI ). In this new topology, an H-bridge CSI is connected with a single or more current modules to generate a multilevel output current waveform with lower di/dt, and less distortion . Using the proposed multilevel CSI, the number of the power switching devices, and isolated gate drive circuits can be reduced. Moreover, chopper based DC current sources are presented to reduce the inductor size effectively to be in micro-Henry order, and ensure the balance of the intermediate current levels. The proposed topology is inherently able to reduce the inductor conduction losses if compared with the conventional multilevel CSIs and the H-bridge CSI. S even-level PWM inverter configuration s with non-isolated DC current sources and with a single DC power source are verified through computer simulation s. Furthermore, laboratory prototypes of seven-level CSI is setup and tested . The results show that the inverter circuit works properly to generate the multilevel output current waveform with low harmonics currents, small inductors and with less conduction losses which proves feasibility of the proposed multilevel CSI. Normal 0 false false false EN-US X-NONE X-NONE DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5603
TL;DR: In this paper, the converter topologies for 6/4 switched reluctance motor and asymmetric bridge converter topology for 8/6 switch reluctance motor are discussed and a closed loop for each converter is proposed.
Abstract: Switched reluctance motor (SRM) is becoming popular because of its simple construction, robustness and low-maintenance. This motor is very useful for high speed applications because no windings are placed on rotor and can also be used for variable speed applications in industries. Converter is one of the important elements in SRM which plays a very crucial role. In this paper various converter topologies for 6/4 switched reluctance motor and Asymmetric bridge converter topology for 8/6 switched reluctance motor are discussed. Finally a closed loop for each converter topology is proposed. The converter topologies are simulated by using MATLAB/SIMULINK. Constant speed is achieved in closed loop control. DOI: http://dx.doi.org/10.11591/ijpeds.v5i1.6133
TL;DR: In this paper, the authors present the speed performance analysis of indirect field-oriented control (FOC) induction motor drive by applying Proportional Integral (PI) controller, PI with Anti-Windup (PIAW) and Pre-Filter (PF) strategies.
Abstract: This paper presents the speed performance analysis of indirect Field Oriented Control (FOC) induction motor drive by applying Proportional Integral (PI) controller, PI with Anti-Windup (PIAW) and Pre- Filter (PF). The objective of this experiment is to have quantitative comparison between the controller strategies towards the performance of the motor in term of speed tracking and load rejection capability in low, medium and rated speed operation. In the first part, PI controller is applied to the FOC induction motor drive which the gain is obtained based on determined Induction Motor (IM) motor parameters. Secondly an AWPI strategy is added to the outer loop and finally, PF is added to the system. The Space Vector Pulse Width Modulation (SVPWM) technique is used to control the voltage source inverter and complete vector control scheme of the IM drive is tested by using a DSpace 1103 controller board. The analysis of the results shows that, the PI and AWPI controller schemes produce similar performance at low speed operation. However, for the medium and rated speed operation the AWPI scheme shown significant improvement in reducing the overshoot problem and improving the setting time. The PF scheme on the other hand, produces a slower speed and torque response for all tested speed operation. All schemes show similar performance for load disturbance rejection capability.
TL;DR: In this paper, a cost effective photovoltaic (PV) fed 3 phase induction motor drive which serves for rural pumping applications is proposed, where a new single stage battery less power conversion is employed by designing a maximum power point tracker (MPPT) embedded boost converter which makes the overall cost of the setup to go down considerably.
Abstract: This Paper emphasizes on proposing a cost effective photovoltaic (PV) fed 3 phase Induction motor drive which serves for rural pumping applications. Generally in a standalone system, the PV unit will charge the battery and the battery set up in turn will serve as a source for the inverter. A new single stage battery less power conversion is employed by designing a maximum power point tracker (MPPT) embedded boost converter which makes the overall cost of the setup to go down considerably. The realized as a prototype consisting PV array of 500watts, MPPT aided boost converter, three phase inverter and a three phase squirrel cage induction drive of 300 watts. An efficient and low cost micro controller dspic4011 is used a platform to code and implement the prominent perturb and observe MPPT technique .Sinusoidal pulse width modulation (SPWM) is the control technique employed for the three phase inverter. To validate the experimental results simulation of the whole set up is carried out in matlab /simulink environment. Simulation and hardware results reveal that the system is versatile. DOI: http://dx.doi.org/10.11591/ijpeds.v5i2.6209
TL;DR: In this paper, a comparison of a 7-level inverter with a 9-level system is made using MATLAB Simulink and the results verify the effectiveness of the proposed strategy in terms of computational efficiency as well as the capability of the inverter to produce very low distorted voltage with low switching losses.
Abstract: The use of multilevel inverters has become popular in recent years for high-power applications Multilevel Inverters are power converter systems composed by an array of power semiconductor sources that when properly connected and controlled can generate a multistep voltage waveform with variable and controllable frequency, phase and amplitude This study deals with the comparison of a 7-level inverter with a 9-level inverter system; the voltage source inverters (VSI) are modelled and simulated using MATLAB Simulink and the results are presented The test results verify the effectiveness of the proposed strategy in terms of computational efficiency as well as the capability of the inverter to produce very low distorted voltage with low-switching losses This research aims to extend the knowledge about the performance of different clamped multilevel inverter through harmonic analysis Simulations results validate up to the mark performance of the mentioned topologies DOI: http://dxdoiorg/1011591/ijpedsv5i16190
TL;DR: In this paper, a sliding mode current observer (SMCO) was implemented to estimate the rotor position, and a vector control method was employed to achieve the sensorless drive system.
Abstract: In this paper, experimental results of 3-phase permanent magnet synchronous motor (PMSM) sensorless speed control are presented. To estimate the rotor position, a sliding mode current observer (SMCO) was implemented. This observer estimates the back emfs of the motor in the stationary reference frame using only the measured voltages and currents of the motor. These emfs were utilized to obtain the rotor position. The speed of the motor was calculated by differentiating the rotor position angle. The stability of the proposed SMCO was verified using Lyapunov method to determine the observer gain. The saturation function was adopted in order to reduce the chattering phenomenon caused by the SMCO. A vector control method was employed to achieve the sensorless drive system. The control application was developed in C/C++ language and implemented using the Texas Instruments TMS320LF2812 digital signal processor (DSP). This new processor enables intelligent control for motors. We used to test the drive the MCK2812 which is a professional development kit available from Technosoft Company. The theoretical finding is validated with experimental results that show the effectiveness of the real-time implementation.