三相四线UPQC直流侧电容电压波动机理及抑制方法  

DC Side Capacitor Voltage Fluctuation Reason and Inhibition Method for Three-phase Four-wire UPQC

作　　者：谭智力[1] 朱冬姣[1] 陈坚[2] 

机构地区：[1]中国地质大学机电学院,湖北省武汉市430074 [2]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《电力系统自动化》2010年第7期61-65,74,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50807049);中国地质大学优秀青年教师资助计划项目(CUGQNL0842)~~

摘　　要：当三相四线统一电能质量调节器(UPQC)工作于不平衡及非线性条件下时,直流侧电容电压波动不可避免,将直接影响串、并联补偿器的正常变换,进而影响UPQC的补偿性能。文中详细分析了这种波动不可避免的原因,提出了直流电压调节系数的概念,推导出其表达式,分析了利用其消除电容电压波动影响的原理,并将其作为抑制直流侧电压波动的措施应用于带负载电压前馈的并联侧直接电流控制策略和串联侧双闭环控制策略。实验结果表明,采用这种方法可以抑制直流侧电容电压波动对串、并联补偿器的影响,与未加入此种抑制措施的控制策略相比,UPQC的补偿性能得到了提高,表明了这种措施的有效性。When a three-phase four-wire unified power quality conditioner（UPQC） works under unbalanced and nonlinear conditions,the voltage fluctuations on the DC side are inevitable.These fluctuations will directly affect the series and parallel converters of UPQC transforming normally.The causes and the inevitability of fluctuation of voltage on the DC side are discussed in detail.In order to eliminate the negative effect of voltage fluctuations on the series and parallel converters,the concept of DC voltage regulation coefficient is proposed.It is deduced from the principle of sinusoidal pulse width modulation（SPWM） which is then used as a suppression measure of voltage fluctuation on DC side in the direct current control strategy with load voltage feed-forward for parallel converter and the double-closed-loop control strategy for series converter.Experimental results show that using these control strategies,the impact of voltage fluctuations on DC side on the series and parallel converters can be inhibited.Compared with the control strategy without the DC voltage regulation coefficient,UPQC compensation performance has been improved,indicating that the control strategies are effective.The work is jointly supported by National Natural Science Foundation of China（No.50807049）and the Research Foundation for Outstanding Young Teachers,Chinese University of Geosciences（Wuhan）（No.CUGQNL0842）.

关 键 词：统一电能质量调节器 直流电压波动 直流电压调节系数 控制策略 

分 类 号：TM761[电气工程—电力系统及自动化]