基于负荷电压的DVR补偿策略分析方法及最小能量控制  

Analysis Method of DVR Compensation Strategy Based on Load Voltage and Minimum Energy Control

作　　者：孙哲[1] 郭春林[1] 肖湘宁[1] 徐永海[1] 刘颖英[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京市昌平区102206

出　　处：《中国电机工程学报》2010年第31期43-49,共7页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重大项目(2007BAA12B03);电力系统国家重点实验室开放基金重点项目(SKLD09KZ09)~~

摘　　要：动态电压恢复器(dynamic voltage restorer,DVR)的补偿策略对于补偿效果有很大影响。针对传统分析方法的不足,提出一种基于暂降前负荷电压的相量图分析方法,该方法物理概念清晰,确定DVR补偿范围时简洁方便,在分析复杂电压暂降的补偿策略时具有很大优势,且可适用于负荷不平衡情形。给出该分析方法的基本思路与过程,并以三单相桥共用直流母线型DVR为例,对其补偿策略进行研究,通过该方法实现在发生不平衡电压暂降且负荷不平衡时最小能量的补偿策略,并给出实现零有功补偿的条件,有效地延长了DVR补偿时间。仿真结果验证了该方法的正确性。The compensation strategy of the dynamic voltage restorer （DVR） has significant impact on the compensation result. A new analysis method based on pre-sag load voltage was proposed to ovcrcome the shortcomings of the traditional method. The new method chooses the pre-sag load voltage phasor as the reference phasor and puts the centre of the limit compensation voltage circle at the terminal of the system voltage phasor. It has characteristics of both definite physical concept and convenient method in determining compensation range. Moreover, it has great advantages in analyzing the complicated voltage sag and unbalanced load as well. The basic theory and process of the new method was explained and compensation strategy of the three single-phase DVR which shares the common DC link was analyzed. Using the new method, the minimum energy compensation strategy was realized through the simulation when unbalanced voltage sag happened in the case of the unbalanced load. The conditions for zero active power compensation was also analyzed which could prolong the compensation time. The simulation result shows the Correctness of the theoretical analysis.

关 键 词：动态电压恢复器 补偿策略 分析方法 不平衡电压暂降 不平衡负荷 最小能量补偿策略 

分 类 号：TM76[电气工程—电力系统及自动化]