Double closed loop control and analysis for shunt inverter of UPFC

2005 International Conference on Electrical Machines and Systems Pub Date : 2006-05-21 DOI:10.1109/TDC.2006.1668576

Yonggao Zhang, Liming Liu, Pengcheng Zhu, Xiaoyuan Liu, K. Yong, Gao Yanli

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引用次数: 4

Abstract

The paper presents an in-depth analysis for the dynamic performance of the shunt inverter of unified power flow controller (UPFC). The goal of the shunt inverter is stabling the node voltage and the dc-link capacitor voltage. The d-q math model of shunt invert based on three phase PWM converter is established in the paper. In order to improve the dynamic performance and control precision, the paper propose a double closed loop decoupling control scheme and briefly introduce the proceeding of control system design. Node voltage outer loop control system adopts indirect current droop control, which consists of PI regulation and scaling factors of droop characteristic. A current feed-forward link is introduced into dc-link capacitor voltage regulation. The simulation model is constructed by using MATLAB and the simulation results for a case study indicate that dc-link capacitor voltage and node voltage can be controlled efficiently, attest that control scheme and controller design are viable and effective. Furthermore, the proposed control scheme is validated by the experimental results on a 15-KVA laboratory-scale setup

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UPFC并联逆变器的双闭环控制与分析

本文对统一潮流控制器(UPFC)并联逆变器的动态性能进行了深入分析。并联逆变器的目标是稳定节点电压和直流电容电压。建立了基于三相PWM变换器的并联逆变器的d-q数学模型。为了提高系统的动态性能和控制精度，提出了一种双闭环解耦控制方案，并简要介绍了控制系统的设计过程。节点电压外环控制系统采用间接电流下垂控制，由PI调节和下垂特性比例因子组成。在直流电容电压调节中引入了电流前馈环节。仿真结果表明，直流链路电容电压和节点电压均能得到有效控制，验证了控制方案和控制器设计的可行性和有效性。最后，在15kva的实验装置上验证了所提出的控制方案

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2005 International Conference on Electrical Machines and Systems

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