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This paper present three-phase four-wire active filter for power line conditioning (PLC) to improve power quality in the distribution network. The active power filter (APF) is implemented with PWM based current controlled voltage source inverter (VSI). This VSI switching signals are generated through proposed three-level hysteresis current controller (HCC) that achieves significant reduction in the...
This paper presents a novel synchronous reference frame (SRF) controlled five-level cascaded multilevel inverter based shunt active filter for power line conditioners (PLCs) to improve the power quality in the distribution system. The SRF based compensation is developed by sensing load currents only, which require for harmonics and reactive power compensation due to non-linear loads. The attempt is...
In this paper optimal control strategies for active power filters working under non-sinusoidal voltage are approached using Pareto Optimal based multi-objective optimization. Where the voltages are distorted, there is some conflict between power factor improvement, current harmonics mitigation, and cost issues. The Strength Pareto multi objective optimization approach is used to simultaneously optimize...
In this paper, a neural network based reference current computation method for active power filter (APF) control under non-ideal mains voltage with different load condition is proposed. The neural network controller has been designed to extract fundamental frequency components from non-sinusoidal and unbalanced currents. These fundamental frequency components will be used as unit templates. The APF...
The configuration and principle of shunt active power filter is introduced briefly in this paper. A digitally controlled shunt active power filter based on double DSP is designed for the three-phase four-wire system. The main circuit of the shunt active power filter selects a four-leg voltage-source inverter, and a dynamic hysteresis-band current control is used to track the current. A control strategy...
In this paper, a novel neural network based phase locked loop (PLL) less reference current computation method for active power filter (APF) control under non-ideal mains voltage conditions with different load condition is proposed. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been designed to extract fundamental frequency components from non-sinusoidal...
This paper deals with a novel configuration of single-phase hybrid active power filter. One of the advantages of the proposed hybrid filter is its adjustable capability to determine voltage rating and current rating of active power stage by selecting appropriate values for its passive filter parameters. Equivalent circuit of proposed hybrid filter has been presented and its filtering characteristic...
Model-based simulations by commercial simulation packages, such as EMTP/ATP, PSCAD/EMTDC and MATLAB/SIMULINK often provide convenience for testing and analyzing the power quality studies. Nowadays, the real-time simulation techniques are highly developed to enhance the capabilities of traditional off-line simulations. This paper presents the real-time simulation techniques for a shunt active passive...
This paper presents a technique with instantaneous power theory in order to control APF under non-ideal mains voltage conditions. The quality of the electrical current becomes a major concern. Power electronic equipments draw non-sinusoidal currents from the utility, causing interference with adjacent sensitive loads and limit the utilization of the available electrical supply. In this paper a parallel...
As a kernel technique of active power filter (APF), harmonic detection and its tracking method are investigated in this paper. Firstly, according to APF discussed here, an adaptive notch filter is presented and the LMS algorithm is examined to meet the crucial requirements of the filter's tracking behavior under time-varying condition. Secondly, an upgraded method is emphasized on the basis of the...
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