J.H. Xu

Bio: J.H. Xu is an academic researcher from Centre national de la recherche scientifique. The author has contributed to research in topics: Voltage source & Harmonics. The author has an hindex of 2, co-authored 3 publications receiving 20 citations.

Simulation and experimentation of a voltage source active filter compensating current harmonics and power factor

Abstract: This paper describes a simple control method of voltage source active filters which compensate simultaneously the harmonics and reactive power absorbed by nonlinear loads. The calculation of active filter current references is based on the principle that the active component of load currents can be estimated by a PI regulator which controls the capacitor voltage of the active filter. By choosing appropriate parameters for the PI regulator, satisfactory static and dynamic performances can be obtained. The theoretical study is firstly confirmed by numerical simulation of a three-phase active filter-rectifier system and then by experimentation through a single-phase low-power model. >

A new approach to control by model of a voltage source GTO active power filter

Abstract: Harmonics generated by high power conventional AC/DC converters have become a serious problem for the AC mains as they can only be removed by using bulky passive filters. However, the remarkable progress made by power electronic devices in recent years makes it possible to concieve the self-adaptable harmonic suppressor called active power filter. In this paper we described a new approach of PWM control based on a modelisation of the active power filter decoupling reactor. The system under consideration is composed of a voltage source active power filter and a SCR rectifier bridge supplying an inductive load. The rectifier generates harmonic currents. The active power filter should detect and compensate them in order to approach the sinewave current in the mains. The harmonic current reference is calculated according to the method based on the calculation of the instantaneous power described by Akagi, Nabae and Atoh (1986). The GTOs are controlled by using the space vector method. Each GTO will switch one time per sampling period of 670 μs. This control has a good aptitude to minimize undesirable harmonic currents. In order to take into account of the delay time corresponding to the calculation time of the microprocessor a prediction of the current references is used. The whole system described above is studied in this paper. The modeling and numerical simulation using the specified open loop control are considered. The reliability of the system with respect to the variation of the system parameters is investigated.

A review of active filters for power quality improvement

Abstract: Active filtering of electric power has now become a mature technology for harmonic and reactive power compensation in two-wire (single phase), three-wire (three phase without neutral), and four-wire (three phase with neutral) AC power networks with nonlinear loads. This paper presents a comprehensive review of active filter (AF) configurations, control strategies, selection of components, other related economic and technical considerations, and their selection for specific applications. It is aimed at providing a broad perspective on the status of AF technology to researchers and application engineers dealing with power quality issues. A list of more than 200 research publications on the subject is also appended for a quick reference.

Comparison of fuzzy logic and proportional integral controller of voltage source active filter compensating current harmonics and power factor

Abstract: This paper presents and compares the performance of two control techniques namely fuzzy logic FL and proportional integral PI applied to a voltage source inverter operating as an active power filter. The controllers permit to compensate harmonics and reactive power generated by the non-linear load simultaneously. This work is performed in order to make an accurate comparison of fuzzy logic controller and classical control technique such as PI controller. The fuzzy logic controller implemented uses Sugeno method, and is optimized by using adaptive neuro fuzzy inference system ANFIS. Steady state and transient performance are compared for different methods. The obtained results show the fuzzy logic controller is performing much better than the PI controller over a wide operating range.

Active power filter for three-phase current harmonic cancellation and reactive power compensation

Abstract: To address power quality problems in industrial power systems, a new control scheme for three-phase active power filter is proposed. The control scheme includes two functional modules such as a current harmonic cancellation module and a reactive power compensation module. The current harmonic cancellation module is based on a multiple adaptive feed-forward cancellation algorithm for selective current harmonic identification. The reactive power compensation module utilizes the measured voltage and the estimated fundamental current to calculate reactive power. After the above information has been calculated, the corrective current reference signals can be generated for the active filter. In this way, the two control functions are integrated together so that one active filter can accomplish two functions simultaneously. Simulation results under different operating conditions demonstrate that the proposed control scheme can successfully cancel harmonic current and compensate reactive power at the point of common coupling.

Active power line conditioners for power quality improvement -A prospective

Abstract: Active Power line Conditioning (APLC) of electric power has now become a mature technology for eliminating harmonics and reactive power compensation in two-wire (single-phase), three-wire (three-phase without neutral) and fourwire (three-phase with neutral) ac power networks 'This paper presents a comprehensive status of APLC configurations, control strategies, selection of components, and related economic and technical considerations It is aimed to provide a broad prospective on the status of APLC technology to researchers and application engineers dealing with power quality issues

Indirect current control techniques of three phase APF using fuzzy logic and proportional integral controller: comparative analysis

Abstract: This work presents a comparative study of two indirect current control techniques based on proportional integral (PI) controller and on a fuzzy logic controller applied to a voltage source inverter operating as an active power filter. The performance of the fuzzy controller depends on the choice of membership function and the inference of fuzzy rules that does not require an accurate mathematical model of power converter. The objective of this paper is to design a fuzzy controller using a Sugeno method, then optimizing it using an adaptive neuro-fuzzy inference system (ANFIS) and thereafter compare the simulation results with a proportional integral controller (PI). The output of these controllers is used to calculate the peak supply current. Simulation results are presented using Matlab. It is demonstrated that the fuzzy logic controller improves the performance of the active filter.