一种三相四线统一电能质量调节器的零稳态误差控制策略  

A New Zero Steady-State Error Control Strategy Used in Three-Phase Four-Wire UPQC

作　　者：谭智力[1] 朱冬姣[1] 陈坚[2] 董浩斌[1] 

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

出　　处：《电工技术学报》2011年第10期77-83,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50807049)

摘　　要：对三相四线统一电能质量调节器(UPQC),当电源电压和负载电流不平衡或存在畸变时,常规p-q-r轴上的比例-积分(PI)调节器无法获得零稳态误差。为解决这个问题,提出了一种在p-q-r轴上的交流等效PI调节器,详细分析了利用它获得零稳态误差的原理,提出了常规PI调节器加交流等效PI调节器的控制策略,推导出了在改进p-q-r坐标上的控制方程,给出了系统的控制框图。实验结果表明,采用的控制方法较好地实现了UPQC的补偿性能。通过比较发现,对于同样的双闭环控制策略,采用了交流等效PI调节器的UPQC的补偿性能好于未采用时的补偿性能,证明了交流等效PI调节器对减小UPQC的稳态误差是有效的。For three-phase four-wire UPQC,when source voltage or load current are unbalance or distort,conventional proportional-integral controller on the p-q-r axis can not eliminate steady-state error.To solve this problem,an AC equivalent proportional-integral controller in p-q-r axis is proposed.Its principle of eliminating steady-state error to zero is analyzed and a new control strategy by using of it with conventional proportional-integral controller is presented.A principle analysis of the proposed control strategy is described in particular.Meanwhile the control formulas on the improved p-q-r coordinate are deduced in detail.The control schematic diagram based on these formulas is presented.Experiment result shows that UPQC efficiently carry out its compensation function while adopting the proposed control strategy.

关 键 词：统一电能质量调节器 交流等效PI控制器 零稳态误差 双闭环控制 

分 类 号：TM714.2[电气工程—电力系统及自动化]