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Mu-Shan Liao

Bio: Mu-Shan Liao is an academic researcher. The author has contributed to research in topics: AC power & Harmonics. The author has an hindex of 1, co-authored 2 publications receiving 16 citations.

Papers
More filters
Proceedings ArticleDOI
19 Aug 2001
TL;DR: In this paper, a simple control scheme which adopted the voltage source inverter to decrease current harmonics generated by the nonlinear load is presented, which can achieve high power factor, current harmonic elimination and reactive power compensation.
Abstract: This paper presents a simple control scheme which adopted the voltage source inverter to decrease current harmonics generated by the nonlinear load. The sliding mode control is used in the current control loop to achieve fast dynamics. Only the source currents are measured in the proposed control scheme to reduce the elements of current sensors needed in the conventional control approach. A simple proportional-integral controller is adopted in the voltage control loop to achieve slow dynamics. The proposed scheme can achieve high power factor, current harmonic elimination and reactive power compensation. A diode rectifier fed capacitive load as the nonlinear load is taken on the AC mains to demonstrate the effectiveness of the shunt active filter for reactive power and current harmonics compensation.

16 citations

Journal ArticleDOI
TL;DR: In this paper, a simple strategy and low cost control for the switching mode rectifier to work simultaneously as a power factor corrector and an active power filter (APF) to reduce current harmonics drawn from the nonlinear load are analyzed and presented.
Abstract: A simple strategy and low cost control for the switching mode rectifier to work simultaneously as a power factor corrector and an active power filter (APF) to reduce current harmonics drawn from the nonlinear load are analysed and presented in this paper. The principal component of the control circuit is an Intel 80196MC microcontroller that performs the dc bus voltage and line current control. The sliding mode control is used in the current loop to achieve fast line current dynamics. The source currents only are measured in the proposed control scheme instead of both the source and load currents needed in the conventional control approach. A simple proportional-integral control is adopted in the voltage loop to achieve slow dc bus dynamics. The proposed control strategy can achieve a high power factor and low current harmonics. No dedicated APF is needed in the proposed control strategy. To demonstrate the effectiveness of the integrated power factor compensator for elimination of reactive power and curr...

Cited by
More filters
Proceedings ArticleDOI
06 Jul 2018
TL;DR: This survey organizes and evaluates the existing reviews to identify the patterns and the new trends in this field and assemble the existing approaches concerning different aspects of active power filters and their control techniques.
Abstract: The rapid growth in nonlinear appliances over the past years has increased the power quality problems along the grid. This has called up a continuous research to develop the active power filters. The persistent development has produced numerous applications that have helped in improving the power quality. Although many publications were dedicated to reviewing active power filters, this survey organizes and evaluates the existing reviews to identify the patterns and the new trends in this field. This paper seeks to assemble the existing approaches concerning different aspects of active power filters and their control techniques. This review should be quite beneficial for engineers and researchers who are interested in solving power quality issues using active filters to be able to select the most adequate and preferable technique for their applications.

20 citations

Journal ArticleDOI
TL;DR: In this article, a sliding mode control with fixed switching frequency for three-phase three-leg voltage source inverter based four-wire shunt active power filter is proposed to improve phase current waveform, neutral current mitigation, and reactive power compensation in electric power distribution system.
Abstract: The present paper proposes a sliding mode control with fixed switching frequency for three-phase three-leg voltage source inverter based four-wire shunt active power filter. The aim is to improve phase current waveform, neutral current mitigation, and reactive power compensation in electric power distribution system. The performed sliding mode for active filter current control is formulated using elementary differential geometry. The discrete control vector is deduced from the sliding surface accessibility using the Lyapunov stability. The problem of the switching frequency is addressed by considering hysteresis comparators for the switched signals generation. Through this method, a variable hysteresis band has been established as a function of the sliding mode equivalent control and a predefined switching frequency in order to keep this band constant. The proposed control has been verified with computer simulation which showed satisfactory results.

16 citations

Journal Article
TL;DR: In this article, the authors developed a control and regulation method for the input DC voltages of a 5-level neutral point clamping (NPC) active power filter (APF), which is applied for the enhancement of medium-voltage network power quality by compensation of harmonic currents produced by an induction motor speed variator.
Abstract: The purpose of this paper is to develop a control and regulation method for the input DC voltages of a 5-level neutral point clamping (NPC) active power filter (APF). This APF is applied for the enhancement of medium-voltage network power quality by compensation of harmonic currents produced by an induction motor speed variator. In the first part, the authors present a topology of a 5-level NPC voltage source inverter and its simplified space vector pulse width modulation (SVPWM) control strategy. In the second part, the control strategy of the 5-level pulse width modulation current rectifier is presented. In the third part, to remedy to instability problem of the input DC voltages of the APF, the authors propose the feedback control of the 5-level rectifier associated with a simplified SVPWM with the redundant vectors method for the 5-level APF. After that, the sliding mode regulator used to control the APF is developed. The application of the proposed control algorithm offers the possibility of stabilizing the DC voltages of the APF. The stable DC bus supply associated with the sliding regulator of the APF allows the obtainment of low-harmonic content network currents with unity power factor. The instability problem associated with the use of the multilevel APF is solved. The obtained results are full of promise for the use of the multilevel APF in medium-voltage and high-power applications.

15 citations

Journal ArticleDOI
TL;DR: In this paper, a hybrid fuzzy sliding-mode controller (HFSMC) was proposed for a three phase shunt active filter to enhance the power quality and improve the reactive power profile in the distribution grid.
Abstract: Power quality has become an important issue in recent years due to the increasing use of solid-state switching devices and other nonlinear loads. These non-linear loads generate undesirable harmonics causing distortions in the current and voltage waveforms.Shunt active power filters have proven very effective to mitigate harmonics. This paper describes a hybrid fuzzy sliding-mode controller (HFSMC) for a three phase shunt active filter to enhance the power quality and improve the reactive power profile in the distribution grid.The proposed method attenuates the effect of both uncertainties and external disturbances, and eliminates the chattering phenomenon induced by classical sliding-mode control. Simulation are presented to demonstrate the effectiveness of the proposed control strategy. The results show that the proposed HFSMC control scheme is able to mitigate harmonic distortions, and provide reactive power compensation and power quality improvement.

6 citations

Journal ArticleDOI
TL;DR: The authors present a topology of five-level NPC Voltage Source Inverter (VSI) and propose a model of this converter and its PWM control strategy, and the sliding mode regulator used to control the active filter is developed.
Abstract: One of the most important drawbacks of the three phases five-level NPC (Neutral Point Clamped) Active Power Filter (APF) is the neutral point balance. As the consequence, the capacitors voltages of the input DC bus of the APF are not equal which constitutes the major limitation for the use of this power converter. In order to stabilize these DC voltages, it is proposed in this paper to study the cascade constituted by three phases three-level PWM rectifier-clamping bridge filter-five-level NPC APF. In the first part, the authors present a topology of five-level NPC Voltage Source Inverter (VSI), and then, they propose a model of this converter and its PWM control strategy. In the second part, the modeling and control of three-level PWM current rectifier is presented. In the third part, to remedy to instability problem of the input capacitors DC voltages of the APF, the authors propose feedback control of the three-level PWM rectifier followed by clamping bridge filter. After that, the sliding mode regulator used to control the active filter is developed. The obtained results are full of promise to use this topology of APF in high voltage and high power applications.

5 citations