三相四线制系统瞬时功率理论的比较研究  

Comparative Study of Three-phase Fourwire System Instantaneous Power Theory

作　　者：侯世英[1] 潘翀[1] 吕厚余[1] 李学远[1] 

机构地区：[1]重庆大学高电压与电工新技术教育部重点实验室,重庆400044

出　　处：《高电压技术》2007年第5期114-117,共4页High Voltage Engineering

摘　　要：为深入分析应用于三相四线制系统的3种瞬时功率理论,由3种瞬时功率的定义出发,利用自由度观点和能量守恒原理,分析了各种瞬时功率理论的各自特点,并利用仿真软件MATLABLE建立了三相四线制带不对称负荷的仿真模型,对比了3种瞬时功率理论的分析结论。结果表明:传统瞬时功率理论在全局补偿中有优势;改进瞬时功率理论较适用于对各种谐波分量进行精细补偿的场合;p-q-r坐标系的瞬时功率理论具有能量守恒和无功功率相互独立的特点,适用于独立无功补偿场合。From view of reactive power compensation in three-phase four-wire systems, the authors logically analyze and compare the p-q-r theory with other kinds of instantaneous power theories which are widely applied in power compensation on current detecting algorisms in three-phase four-wire system thoroughly. With the definitions of the instantaneous power theories and from the viewpoints of control freedom and principle of energy conservation, the advantages and disadvantages of these theories are concluded. After the logically deducing, the authors establish a model of a nonlinear load of there phase four wire system with MATLABLE simpower system, then applied the theories in practice. It is concluded that traditional instantaneous power theory is useful in total compensation, by which both reactive power and active power depends on reactive current, but does not comfort with energy conservation. The adapted instantaneous power theory which comply with energy law, is valuable in precise current compensation. The instantaneous power theory in p-q-r coordinates in which the energy conservation and reactive power is independent each other, is important in reactive power independent compensation. The p-q-r theory provides two degrees of freedom to control the system currents by only compensating the instantaneous imaginary power without using any energy storage element. The definition of powers maintains conservatism agrees well with the general understanding of power. Simulation results show the superiority of the p-q-r theory both in definition and compensation. The p-q-r theory extends power theory family with its outstanding advantages, it will be wildly applied in reactive power compensation.

关 键 词：三相四线制系统 瞬时功率理论 p-q—r坐标系 自由度 能量守恒原理 无功补偿 

分 类 号：TM711[电气工程—电力系统及自动化]