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This paper presents the performance evaluation of a hybrid filter for current harmonic elimination and improved input power factor. Hybrid filter consists of a shunt active power filter and passive filters. In the proposed scheme, shunt active power filter operates at a very low switching frequency, thus giving higher conversion efficiency. The combined operation of shunt active power filter and passive...
The paper design a current control based active power filter (APF) for improving power quality by reactive power compensation and harmonic filtering. The designed APF is based on a voltage source inverter (VSI), where the VSI is controlled by two loops, the voltage control loop and the current control loop. The voltage control loop is used to regulate the DC link capacitor voltage of the VSI. Via...
Active power filter (APFs) has been used to mitigate the harmonic pollution in an electrical network. Reference current estimation is an important part for control of an active power filter. In any inaccuracy in generation of reference current, it yields to poor compensation in load current harmonics. This paper deals with five types of time domain control techniques for real time compensating current...
Most common problem arising in supply network is current harmonics because of the increased use of nonlinear loads. Traditionally passive and active filters are best solutions for harmonic removal, but they have some practical limitations. Solution to these limitations is to use hybrid active power filters (HAPF) which are different combinations of passive and/or active filters. HAPF inherit the efficiency...
Shunt active power filters (APF) are widely used in power systems to eliminate the current harmonics and to compensate reactive power due to their accurate and fast operation. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the...
In this paper, a novel control algorithm for three-phase four-wire shunt active power filter for the compensation of instantaneous harmonic current components in nonlinear loads is presented. Fundamental signal extraction is carried out using Harmonic Tuned Filter (HTF) without the Phase Locked Loop (PLL). HTF can efficiently determine the fundamental signal components from distorted voltage or current...
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...
The procedure for calculating controller parameters of the APFs implemented into a multibus industrial power system for harmonic voltage mitigation is presented. The node voltage detection control strategy is applied and the basic controller parameters are found under the condition that demanded THD factors at the buses where the APFs are placed will be obtained. A cooperative control of several APFs...
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