Abstract
The quality of power that is degrading day by day is an important issue for all the consumers. The important factor for this is harmonics in the voltage and current waveforms which can be resolved by the use of hybrid series active power filter. The combination consists of a series active power filter and a shunt passive filter connected in parallel to the load. The method used in this paper is for the purpose of achieving good harmonic compensation and reduced total harmonic distortion for various types of nonlinear loads as per the standards of IEEE 519. The proposed HSAPF technique uses the synchronous reference frame method for generating the compensating signal with an intelligent PI controller that uses particle swarm optimization (PSO) technique to obtain the required gain values needed to improve the steady state response of the system. The concept of vigorous HSAPF has been authenticated through MATLAB simulation analysis, and the results obtained validate the accuracy of the method for the different load conditions.
Highlights
In the recent times, due to the increase in the power demand, the quality of the power supply has deteriorated drastically at a very rapid rate. e main reason behind this is the use of nonlinear loads in the system which injects harmonics in the system, and it distorts the current and voltage waveform and leads to poor power factor of the supply system [1].it is required to compensate these harmonics generated due to nonlinear loads in the system
Only passive filters were used for harmonic mitigation because of the simple advantage that they were cost effective and reliable, but on the other side, many drawbacks such as resonance and mistuning lead to their discontinuity in the system [2, 3]. ese drawbacks were recently overcome by the use of shunt active power filters in the system which behaves as a current source and compensates the harmonics injected by the nonlinear loads in the system
Out of the different combinations of the hybrid filters that are used in the literature [7,8,9,10,11], the HSAPF is the most promising one [12]. e other evolutionary algorithms such as genetic algorithm [13], bacterial foraging [14], artificial bee colony [15], and Mathematical Problems in Engineering gravitational search [16] have been recommended in the last decades, but particle swarm optimization with its simplicity has an edge over the existing techniques. e aim is to reduce the total harmonic distortion in both the load voltage as well as in the source current as per the IEEE standard 519. e first proposal was based on the instantaneous reactive power theory [17, 18]
Summary
Due to the increase in the power demand, the quality of the power supply has deteriorated drastically at a very rapid rate. e main reason behind this is the use of nonlinear loads in the system which injects harmonics in the system, and it distorts the current and voltage waveform and leads to poor power factor of the supply system [1]. Ese drawbacks were recently overcome by the use of shunt active power filters in the system which behaves as a current source and compensates the harmonics injected by the nonlinear loads in the system. Active power filters inject the same harmonics in the system as that of load, but they are opposite in phase to the load harmonics They were not preferable in the large systems due to cost limitations, and series active power filter came in the late 80s as a possible solution to the existing APFs. e different combinations of these series and shunt active power filters have efficiently removed the harmonics in the source current as well as in the load voltage.
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