Harmonics Mitigation of a Microgrid System using Modified SRF-UPQC Method

Abstract

Objectives: To describe the mitigation of power quality problem using modified Synchronous Reference Frame (SRF) Unified Power Quality Conditioner (UPQC) method. To design a Micro grid system using solar PV/wind/energy storage system like battery and power quality analysis i.e. reduction of harmonics and compensation of reactive power flow of the Microgrid system without using phased locked loop (PLL) circuit. Methods/Statistical Analysis: In the proposed system solar PV/Wind/ Battery system are combined to form a Microgrid using MATLAB Simulink environment and the power quality problem is solve by using modified Synchronous Reference Frame (SRF) Unified Power Quality Conditioner (UPQC) method. In order to identify a suitable controller for better compensation of UPQC, modified SRF method is used. This method mainly focuses on regulation on DC link voltage and unit vector generation. PLL circuit is required in case of conventional SRF method for vector orientation but in the proposed method vector orientation is obtain without using PLL. Findings: The drawback of PLL is eliminated by using modified SRF method and the result shown in First Fourier Transform (FFT) analysis that modified SRF method has a better performance than normal SRF method considering both harmonic elimination and reactive power compensation. The performance of the system is verified under both the condition i.e. microgrid with UPQC and without UPQC. The proposed controller compensates harmonics from 16.29% to 3.33% and maintains the DC link voltage constant. Application/Improvements: The issues in the power distribution system are voltage sag, swell, harmonics in both current and voltage waveform. In order to achieve a pure sinusoidal waveform with proper magnitude and phase is a great concern and UPQC is a device which can mitigate all PQ related problem in Microgrid system. This proposed work mainly used in power distribution system based on Microgrid.