PWM控制瞬时值比较法的稳定性分析  

Stability Analysis on PWM Control Instantaneous Comparison Method

作　　者：周林[1] 徐明[1] 张凤[1] 王伟[1] 

机构地区：[1]重庆大学电气工程学院高电压与电工新技术教育部重点实验室,400044

出　　处：《电气应用》2007年第1期65-68,103,共5页Electrotechnical Application

摘　　要：有源电力滤波器(APF)是补偿电力系统谐波及无功功率的重要装置,其电流跟踪控制电路中的控制方法对其性能有很大的影响。定时控制的瞬时值比较法存在局部稳定性问题,为此本文提出了一种双向互补的瞬时值比较法,并对其进行了稳定性分析。结果表明,与传统的定时控制瞬时值比较法相比,它扩展了系统的稳定区域,降低了补偿电流误差。把它用于单相并联型APF,仿真结果验证了理论分析的正确性。Active power filter （APF） is an important equipment to compensate harmonic and reactive currents in power systems and its control manner of the current tracking control circuit has a great influence on its performance. Because the time-control instantaneous comparison method has a problem of localized instability, double-direction compensation instantaneous comparison method is presented and its stability is analyzed. The results verify that, compared with the typical time-control instantaneous comparison method, the stability region is enlarged and the error between compensating current and referenced signal is reduced by this improved method. Simulation results confirm the correctness of theoretic analyses when it is applied to the single-phase shunt APF.

关 键 词：瞬时值比较 有源电力滤波器 稳定性 双向互补 

分 类 号：TM712[电气工程—电力系统及自动化]