EPE Association: EPE-PEMC 2008 - Topic: Active Filtering and Unity Power Factor Correction Circuits

EPE-PEMC 2008 - Topic: Active Filtering and Unity Power Factor Correction Circuits
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Active Filtering and Unity Power Factor Correction Circuits

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   A Novel Hybrid Modulation Method for Cascaded H-Bridge Active Power Filter
By Yonggang Chen [View]
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Abstract: Abstract:In this paper, a novel hybrid modulation method is presented based on the analysis of the existing modulation method, the phase-shifted PWM modulation and the level-shifted PWM modulation. The novel modulation is best fitted for the active power filter based on the cascaded H-bridge converter. It's supported by the simulation with Matlab/Simulink. The simulation results show that the efficiency of the APF can be improved greatly with the novel hybrid modulation method.

   Active Line Shaping of a Single Phase Rectifier Using the Switching Function Technique
By Christos Marouchos [View]
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Abstract: Operation of the Active Line Shaping Single Phase Rectifier with the switching instances pre-calculated is presented. The required input current at unit power factor to feed the dc load is set. The Switching Function Technique is applied to derive the necessary modulation function of the dc side switch. The analysis leads to the calculation of the parameters of the modulation function and the switching instances of the dc side switch. An analytical equation of the line current is also derived. Optimisation is then possible in order to achieve the minimum switching losses by minimising the switching instances for the best quality of input line current. The results are supported by PSPICE simulations.

   Apparent Power Ratio of the Shunt Active Power Filter
By A. Kouzou [View]
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Abstract: The main purpose of this paper is the evaluation of the Shunt Active Power Filter apparent power ratio between the apparent power generated by the source power system to the load and the compensation apparent power produced by the shunt APF to force the currents circulating toward the source to be sinusoidal and balanced. This ratio allows defining the compensations capability for different perturbations in AC power system such as current unbalance, phase shift current and undesired harmonics generated by non linear load. This capability is determined by the maximum rate of the apparent power that can be delivered. In this paper a method of evaluation of this ratio is proposed, it is based on the definition of the effective apparent power as defined in IEEE 1459-2000 which was proved to be a suitable amount to be concerned in the design process of different devices.

   Control of Reactive Power in Double-Fed Machine Based Wind Park
By Elżbieta Bogalecka [View]
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Abstract: Different aspects of reactive power regulation problem in wind farms are presented in this paper. In the first part some background of the reactive power control in wind parks is presented, including motivations for its use and methods that can be used. In general, there are active (wind generator, compensator) and passive methods (L, C) of reactive power compensation. A simulation model of the wind park (model of doubly fed induction generator (DFIG) based wind turbines, transformers, cable lines between wind farm and PCC, control system). has been done to verify the efficacy of proposed methods. Conclusions about need and possibilities of reactive power control have been drawn From simulations in steady and transient state. Next features with special regards to limits of the DFIG working as wind generator are presented. In the final part of the paper selected methods of reactive power control are described and simulation results are presented.

   Shunt Active Power Filter with Improved Dynamic Performance
By Krzysztof Piotr Sozanski [View]
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Abstract: This paper describes a shunt active power filter (APF) with improved dynamic performance. When the value of load current changes rapidly, the typical APF transient response is too slow, and the line current suffers from dynamic distortion. This distortion causes an increase in harmonic content in the line current, which is dependent on a time constant. The APF control current dynamics is dependent on the inverter output time constant consisting of APF output inductance and resultant impedance of load and mains. In the proposed circuit transient performance of APF is improved using a modified output inverter. According to this modification the APF dynamics are improved. The Matlab simulation results of a modified APF are also presented in the paper.

   The Research on the Active Power Filter Based on the Cascaded H-Bridge Converter
By Yonggang Chen [View]
[Download]

Abstract: The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of dc capacitor voltages of the H-bridge units. In this paper, an improved method for dc capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting the modulation waves, it makes the dc capacitor voltages balancing in the accepted tolerance without any additional units. The method is validated by simulation and experiment.

EPE-PEMC 2008 - Topic: Active Filtering and Unity Power Factor Correction Circuits
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2008 - Conference > EPE-PEMC 2008 - Topic: Active Filtering and Unity Power Factor Correction Circuits
	[return to parent folder]

	A Novel Hybrid Modulation Method for Cascaded H-Bridge Active Power Filter By Yonggang Chen	[View] [Download]
Abstract: Abstract:In this paper, a novel hybrid modulation method is presented based on the analysis of the existing modulation method, the phase-shifted PWM modulation and the level-shifted PWM modulation. The novel modulation is best fitted for the active power filter based on the cascaded H-bridge converter. It's supported by the simulation with Matlab/Simulink. The simulation results show that the efficiency of the APF can be improved greatly with the novel hybrid modulation method.

	Active Line Shaping of a Single Phase Rectifier Using the Switching Function Technique By Christos Marouchos	[View] [Download]
Abstract: Operation of the Active Line Shaping Single Phase Rectifier with the switching instances pre-calculated is presented. The required input current at unit power factor to feed the dc load is set. The Switching Function Technique is applied to derive the necessary modulation function of the dc side switch. The analysis leads to the calculation of the parameters of the modulation function and the switching instances of the dc side switch. An analytical equation of the line current is also derived. Optimisation is then possible in order to achieve the minimum switching losses by minimising the switching instances for the best quality of input line current. The results are supported by PSPICE simulations.

	Apparent Power Ratio of the Shunt Active Power Filter By A. Kouzou	[View] [Download]
Abstract: The main purpose of this paper is the evaluation of the Shunt Active Power Filter apparent power ratio between the apparent power generated by the source power system to the load and the compensation apparent power produced by the shunt APF to force the currents circulating toward the source to be sinusoidal and balanced. This ratio allows defining the compensations capability for different perturbations in AC power system such as current unbalance, phase shift current and undesired harmonics generated by non linear load. This capability is determined by the maximum rate of the apparent power that can be delivered. In this paper a method of evaluation of this ratio is proposed, it is based on the definition of the effective apparent power as defined in IEEE 1459-2000 which was proved to be a suitable amount to be concerned in the design process of different devices.

	Control of Reactive Power in Double-Fed Machine Based Wind Park By Elżbieta Bogalecka	[View] [Download]
Abstract: Different aspects of reactive power regulation problem in wind farms are presented in this paper. In the first part some background of the reactive power control in wind parks is presented, including motivations for its use and methods that can be used. In general, there are active (wind generator, compensator) and passive methods (L, C) of reactive power compensation. A simulation model of the wind park (model of doubly fed induction generator (DFIG) based wind turbines, transformers, cable lines between wind farm and PCC, control system). has been done to verify the efficacy of proposed methods. Conclusions about need and possibilities of reactive power control have been drawn From simulations in steady and transient state. Next features with special regards to limits of the DFIG working as wind generator are presented. In the final part of the paper selected methods of reactive power control are described and simulation results are presented.

	Shunt Active Power Filter with Improved Dynamic Performance By Krzysztof Piotr Sozanski	[View] [Download]
Abstract: This paper describes a shunt active power filter (APF) with improved dynamic performance. When the value of load current changes rapidly, the typical APF transient response is too slow, and the line current suffers from dynamic distortion. This distortion causes an increase in harmonic content in the line current, which is dependent on a time constant. The APF control current dynamics is dependent on the inverter output time constant consisting of APF output inductance and resultant impedance of load and mains. In the proposed circuit transient performance of APF is improved using a modified output inverter. According to this modification the APF dynamics are improved. The Matlab simulation results of a modified APF are also presented in the paper.

	The Research on the Active Power Filter Based on the Cascaded H-Bridge Converter By Yonggang Chen	[View] [Download]
Abstract: The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of dc capacitor voltages of the H-bridge units. In this paper, an improved method for dc capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting the modulation waves, it makes the dc capacitor voltages balancing in the accepted tolerance without any additional units. The method is validated by simulation and experiment.