Abstract
Non-linear devices draw non-sinusoidal currents from the source; hence, they cause harmonic distortions in power systems. The shunt active power filter (SAPF) is a well-known method for alleviating current harmonics, compensating the reactive power and improving the power factor; however, the effective design of an SAPF is quite challenging and a thrust area of research. The current controlling technique, switching pulse generation technique and parameter selection are cumbersome tasks in SAPF design. SAPF performance depends on the proper selection of many parameters, such as filter interfacing impedance, DC-link capacitor and PI-controller gains. The effect of these parameters on the performance of SAPF has been studied and optimum values have been obtained by using the Taguchi method. This paper also indicates the benefits of using the Taguchi method compared with existing genetic algorithm (GA) for optimizing the parameters of the SAPF. An instantaneous reactive power theory (IRPT)-based SAPF has been modeled and simulated in MATLAB/Simulink. The SAPF’s parameters have been optimized by using the both proposed Taguchi SNR and the existing GA method. With optimized values of parameters results have been obtained, analyzed and the superiority of the proposed Taguchi method over the existing GA method is discussed. The simulation results were also validated with experimental results.
Highlights
Harmonic contamination is a major issue in power systems, because of the tremendous usage of power electronic equipment and various non-linear loads in recent years
The Taguchi method is capable of optimizing many parameters with lesser experimentation and provides information about the effect of parameter variation on the performance of an shunt active power filter (SAPF) based on the sensitivity of the parameters
The smaller the total harmonic distortion (THD), the better the SAPF; we considered that a smaller signal-to-noise ratio (SNR) ratio was better for analyzing the results
Summary
Harmonic contamination is a major issue in power systems, because of the tremendous usage of power electronic equipment and various non-linear loads in recent years. Harmonic interference adversely affects the power quality under many aspects, such as, given that most of power electronic equipment is non-linear in nature, when used as a load, it draws a non-sinusoidal current from ac sources, generating undesirable current harmonics in the supply side, degrading the power quality [1]. The passive filter is one of the simplest methods of harmonic compensation. Reliable and cost effective, but they have major disadvantages, such as resonance problems and static compensation. Because of these drawbacks, active power filters (APFs) have become very popular as power conditioning devices for harmonic and reactive power compensation [2]
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