Performance of Eight Switches Based Unified Power Quality Conditioner for Enhancing the Quality of Power Using Intelligent Controller

Abstract
Objective: This study presents the unified power quality conditioner (UPQC) which is based on eight switch converter for dropping the total harmonic distortion. Alleviation of power quality is accomplished by power fed to the DC link of the converter and regulates the power using intelligent controller.

Methods: The function of UPQC is determined by how fast and precisely compensation signals are estimated. The UPQC has presented for reducing the coupling problem by the presence of switching leg. In the distributed system needs to explain the approaches for standard supply voltage droop and voltage swell.

Findings: The harmonics is reduced and produces the dynamic response in eight switch converter using genetic algorithm (GA).

Application/ improvements: In the distribution system eight switch converter based UPQC has generated the steady state and dynamic process of control in nonlinear load and/or utility voltage conditions is implemented in MATLAB Simulink.

Keywords: Unified Power Quality Conditioner (UPQC), Genetic Algorithm (GA), Total Harmonic Distortion (THD).

**摘要**
**研究目标**：本研究提出一种基于八开关变换器（eight switch converter）的统一电能质量调节器（Unified Power Quality Conditioner, UPQC），以降低总谐波失真（Total Harmonic Distortion, THD）。通过向变换器直流链路（DC link）馈入功率，并采用智能控制器（intelligent controller）对功率进行调节，实现电能质量的改善。
**研究方法**：统一电能质量调节器的性能取决于补偿信号的估算速度与精度。本研究提出的UPQC通过引入开关桥臂（switching leg）来削弱耦合问题。针对配电网（distributed system）中的标准供电电压降落（voltage droop）与电压骤升（voltage swell）问题，需对相应的处理方案进行阐述。
**研究结果**：采用遗传算法（Genetic Algorithm, GA）的八开关变换器可降低谐波畸变，并获得优异的动态响应性能。
**应用与改进**：针对非线性负载及电网电压异常工况，基于八开关变换器的UPQC可实现稳态与动态控制流程，本方案已在MATLAB/Simulink平台中完成仿真实现。
**关键词**：统一电能质量调节器（UPQC）、遗传算法（GA）、总谐波失真（THD）。