基于瞬时无功功率理论的三相不平衡负荷补偿  

Compensation for three-phase unbalanced load based on instantaneous reactive power theory

作　　者：韦钢[1] 陈森环[1] 蔡阳[1] 卢炜[2] 

机构地区：[1]上海电力学院上海市电站自动化技术重点实验室,上海200090 [2]杭州供电局,浙江杭州310000

出　　处：《电力自动化设备》2010年第2期59-63,共5页Electric Power Automation Equipment

基　　金：上海市重点学科资助项目(J51301)~~

摘　　要：在研究当前补偿装置的基本原理以及补偿信号检测方法的基础上,针对不平衡负荷下的电力系统提出了一种基于瞬时无功功率理论补偿导纳的新算法。该算法以对称分量法为理论支撑,针对不平衡电路特点,通过理论分析得出以瞬时无功电流表达的补偿导纳通式,以该算法作为静态无功补偿器(SVC)控制策略,可在进行无功补偿的同时实现三相不平衡补偿。为有效改善SVC容量利用率,通过讨论补偿导纳的各种不同情况,对于晶闸管控制电抗器(TCR)并联固定电容型SVC的各项参数进行合理的分析,并总结了在不同的条件约束下所补偿范围的大小。最后结合SVC参数的合理选取,通过多种不同的算例分析验证了算法的正确性、有效性。The basic principles of current compensation devices and the detection methods of compensation signal are studied and an algorithm based on the instantaneous reactive power theory is proposed to calculate the compensatory admittance of three-phase unbalanced load,which,supported by symmetrical component method, derives the general formula of compensatory admittance,represented as the instantaneous reactive current,by the theoretical analysis according to the characteristics of asymmetric circuit. It can be used as the control strategy of SVC（Statie Var Compensator） to compensate both the reactive power and the three-phase unbalance. To improve the utilization rate of SVC capacity,the parameters of SVC comprising TCR （Thyristor Controlled Reactor） and parallel fixed-capacitor are analyzed for different conditions of compensatory admittance,and the compensation ranges are summarized for different conditions of restraint. Combined with the proper selection of SVC parameters,the correctness and effectiveness of proposed algorithm are verified by different case calculations.

关 键 词：不平衡负荷 瞬时无功 导纳算法 补偿 静态无功补偿器 

分 类 号：TM714.3[电气工程—电力系统及自动化]