scispace - formally typeset
Search or ask a question
Proceedings ArticleDOI

A novel hysteresis bandwidth (NHB) calculation to fix the switching frequency employed in active power filter

TL;DR: In this article, a revisory method for the hysteresis bandwidth calculation procedure is proposed that makes switching frequency invariable significantly in active power filters (APF) that increases the switching frequency and switching losses in power systems.
Abstract: Variable switching process is the main issue in practical implementation of fixed band hysteresis current controller in active power filters (APF) that increases the switching frequency and switching losses in power systems. Preventing this case, the Adaptive Hysteresis Current Control (AHCC) has been introduced and developed by many researchers. By this way, The Hysteresis Band (HB) will change adaptively by system parameters in order to control the switching speed and fix the switching frequency. In this paper a revisory method for the hysteresis bandwidth calculation procedure is proposed that makes switching frequency invariable significantly. The APF Simulations using proposed method (NHB) in Matlab/Simulink environment has been done. Results including switching frequency and current source TDH have been given to prove the efficiency of this method.

Content maybe subject to copyright    Report

Citations
More filters
Proceedings ArticleDOI
17 Dec 2015
TL;DR: In this paper, a single-phase single-switch bridgeless power factor corrector (PFC) boost Vienna rectifier is used as an onboard electric vehicle (EV) battery charger.
Abstract: This paper presents a single-phase single-switch bridgeless power factor corrector (PFC) boost Vienna rectifier as an onboard electric vehicle (EV) battery charger. The presented topology generates 3-level voltage waveform at the input which eliminates harmonic contents significantly while using small filters. The reduced number of parts used in this topology makes it appealing for EV industries to develop this PFC rectifier as a compact battery charger. Modelling of the single- phase Vienna rectifier is performed and a cascaded PI controller is designed to regulate the DC bus voltage at 400V to charge EV batteries as well as drawing low harmonic grid current and ensuring unity power factor operation of the converter. Simulations are done to validate the good dynamic performance of the single-switch rectifier and adopted controller in generating regulated and low ripple DC voltage from AC grid to supply EV batteries.

39 citations

Proceedings ArticleDOI
01 Sep 2015
TL;DR: In this paper, a multilevel boost PFC (Power Factor Correction) rectifier is presented in which a simple controller is implemented on the studied converter to generate a constant voltage at the output while generating a five-level voltage waveform at the input without connecting the load to the neutral point of the DC bus capacitors.
Abstract: A multilevel boost PFC (Power Factor Correction) rectifier is presented in this paper controlled by cascaded controller and multicarrier pulse width modulation technique. The presented topology has less active semiconductor switches compared to similar ones reducing switching losses as well as the number of required gate drives that would shrink manufactured box significantly. A simple controller has been implemented on the studied converter to generate a constant voltage at the output while generating a five-level voltage waveform at the input without connecting the load to the neutral point of the DC bus capacitors. Multicarrier PWM technique has been used to produce switching pulses from control signal. Multi-level voltage waveform harmonics has been analyzed comprehensively which affects the size of input current and required filters directly. Full simulation and experimental results confirm the good dynamic performance of the proposed five-level PFC boost rectifier in delivering power from AC grid to the DC loads while correcting the power factor at the AC side as well as reducing the current harmonics remarkably.

33 citations

Proceedings ArticleDOI
01 Nov 2015
TL;DR: This paper presents a 7-level cascaded H-bridge (CHB) multilevel inverter using a single DC source to validate the effective voltage balancing procedure integrated into switching technique and consequently generating the 7- level voltage waveform at the output with low harmonic contents.
Abstract: This paper presents a 7-level cascaded H-bridge (CHB) multilevel inverter using a single DC source. The second DC bus is a capacitor that its voltage is controlled by switching sequences. The capacitor voltage is regulated at half of the DC source amplitude to have seven voltage levels at the output. Seven voltage levels include each DC bus voltage, their sum and subtraction. Switching pattern is designed based on the redundant switching states and multicarrier level-shifted pulse width modulation (PWM) technique to help controlling the capacitor voltage at the desired level. Simulation results are presented to validate the effective voltage balancing procedure integrated into switching technique and consequently generating the 7-level voltage waveform at the output with low harmonic contents.

30 citations

Proceedings ArticleDOI
24 Dec 2012
TL;DR: This paper devises a novel fixed-band fixed-frequency (FBFF) hysteresis current control strategy that aims to eliminate completely the mentioned calculations while keeping merits of the adaptive methods.
Abstract: A practical concern with implementing the fixed band hysteresis current control in active power filters (APF) is its variable switching pattern that results in increasing the risk of occurrence of resonance in power systems. To avoid this situation, adaptive hysteresis current control methods with the variable hysteresis bands have been recommended in literature. However, these methods impose an absolutely huge amount of complex computations on the system which, in turn, slows down its response time and thereby, limits the switching frequency. This paper devises a novel fixed-band fixed-frequency (FBFF) hysteresis current control strategy that aims to eliminate completely the mentioned calculations while keeps merits of the adaptive methods. In other words, the suggested strategy employs an algorithm that is similar to the fixed-band variable-frequency hysteresis methods; however, the outcomes are identical to the variable-band fixed-frequency hysteresis current control techniques. Employing the proposed FBFF method to control an APF leads to an accurate modulation performance with the least possible calculations required in a filtering procedure. Several simulations are done using MATLAB/Simulink to verify validity of the proposed method.

19 citations

Proceedings ArticleDOI
03 Jun 2015
TL;DR: Results validate the efficiency of the 7-level PUC APF in eliminating the nonlinear load harmonics and also prove the good dynamic performance of the implemented controller in regulating the capacitors voltages of the PUC converter.
Abstract: In this paper the three-phase 7-level Packed U-Cell (PUC) converter has been employed as a shunt active power filter (APF) to compensate the load harmonics in a power network. Using multilevel converter as APF results in generating low distortion waveforms as well as operating in low switching frequency. A PI controller has been used to compensate the load harmonics and to correct the source side power factor. Real-time simulations are performed in RT-Lab using OPAL-RT simulator. Results validate the efficiency of the 7-level PUC APF in eliminating the nonlinear load harmonics and also prove the good dynamic performance of the implemented controller in regulating the capacitors voltages of the PUC converter.

14 citations


Cites methods from "A novel hysteresis bandwidth (NHB) ..."

  • ...Different topologies and configurations have been proposed for the APFs that mostly used two-level conventional inverters [3, 7-9]....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: In this paper, an adaptive hysteresis-band control method where the band is modulated with the system parameters to maintain the modulation frequency to be nearly constant is described, and an interior permanent magnet (IPM) synchronous machine load is considered.
Abstract: An adaptive hysteresis-band control method where the band is modulated with the system parameters to maintain the modulation frequency to be nearly constant is described. Although the technique is applicable to general AC motor drives and other types of load, an interior permanent magnet (IPM) synchronous machine load is considered. Systematic analytical expressions of the hysteresis band are derived as functions of system parameters. An IPM machine drive system with a voltage-fed current-controlled PWM (pulse width modulation) inverter has been computer simulated to study the performance of the proposed method. >

510 citations


"A novel hysteresis bandwidth (NHB) ..." refers methods in this paper

  • ...The switching frequency of the hysteresis current control method depends on how fast the current changes from the upper limit to the lower limit of the hysteresis band, or vice versa [ 6 , 8]....

    [...]

  • ...AHCC was presented to solve this problem [ 6-8 ]....

    [...]

  • ...To avoid this situation, adaptive hysteresis current controller methods with the variable hysteresis band have been recommended in literature [ 6 , 7]. Hence, a variable hysteresis band is defined for each phase so that the switching frequency remains almost constant....

    [...]

  • ...The conventional HB formula which is calculated with normal direction of the filter current is [ 6 , 7]: 2...

    [...]

01 Jan 2002

346 citations


"A novel hysteresis bandwidth (NHB) ..." refers methods in this paper

  • ...Hysteresis current control is one of the most appropriate PWM switching methods to produce reference current in APFs [4]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a direct current-space-vector control of an active power filter (APF) based on a three-level neutral-point-clamped (NPC) voltage-source inverter is presented.
Abstract: This paper presents a direct current-space-vector control of an active power filter (APF) based on a three-level neutral-point-clamped (NPC) voltage-source inverter. The proposed method indirectly generates the compensation current reference by using an equivalent conductance of the fundamental component using APF's dc-link voltage control. The proposed control can selectively choose harmonic current components by real-time fast Fourier transform to generate the compensation current. The compensation current is represented in a rotating coordinate system with chosen switching states from a switching table implemented in a field-programmable gate array. In addition, a three-phase four-wire APF based on a three-level neutral-point-clamped inverter is also presented. The proposed APF eliminates harmonics in all three phases as well as the neutral current. A three-phase three-wire NPC inverter system can be used as a three-phase four-wire system since the split dc capacitors provide a neutral connection. To regulate and balance the split dc-capacitor voltages, a new control method using a sign cubical hysteresis controller is proposed. The characteristics of the APF system with an LCL-ripple filter are investigated and compared with traditional current control strategies to evaluate the inherent advantages. The simulation and experimental results validated the feasibility of the proposed APF.

240 citations


"A novel hysteresis bandwidth (NHB) ..." refers background in this paper

  • ...INTRODUCTION In recent years, shunt active power filters have being applied by many industries and researchers to remove the current harmonics caused by nonlinear loads [1-3]....

    [...]

Journal ArticleDOI
TL;DR: This paper deals with the hardware implementation of a shunt active filter (SAF) for compensation of reactive power, unbalanced loading, and harmonic currents and its effectiveness with Adaline-based control for load compensation.
Abstract: This paper deals with the hardware implementation of a shunt active filter (SAF) for compensation of reactive power, unbalanced loading, and harmonic currents. SAF is controlled using an adaptive-linear-element (Adaline)-based current estimator to maintain sinusoidal and unity-power-factor source currents. Three-phase load currents are sensed, and using least mean square (LMS) algorithm-based Adaline, online calculation of weights is performed and these weights are multiplied by the unit vector templates, which give the fundamental-frequency real component of load currents. The dc bus voltage of voltage source converter (VSC) working as a SAF is maintained at constant value using a proportional-integral controller. The switching of VSC is performed using hysteresis-based pulsewidth-modulation indirect-current-control scheme, which controls the source currents to follow the derived reference source currents. The practical implementation of the SAF is realized using dSPACE DS1104 R&D controller having TMS320F240 as a slave DSP. The MATLAB-based simulation results and implementation results are presented to demonstrate the effectiveness of the SAF with Adaline-based control for load compensation.

207 citations


"A novel hysteresis bandwidth (NHB) ..." refers background in this paper

  • ...INTRODUCTION In recent years, shunt active power filters have being applied by many industries and researchers to remove the current harmonics caused by nonlinear loads [1-3]....

    [...]

Book
04 Apr 2013

151 citations


"A novel hysteresis bandwidth (NHB) ..." refers methods in this paper

  • ...The hysteresis current control technique is the most suitable method for current control of Voltage Source Inverters (VSIs) in APFs due to its very fast response and good accuracy....

    [...]

  • ...Hysteresis current control is one of the most appropriate PWM switching methods to produce reference current in APFs [4]....

    [...]