电流闭环对三相PWM变流器输出阻抗的影响分析  

Influence of current close-loop control on the output impedance of three-phase PWM converter

作　　者：黄长亮[1] 姜一鸣[1] 周辉[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《电力系统保护与控制》2016年第20期128-133,共6页Power System Protection and Control

基　　金：国家自然科学基金资助项目(51277137;51177113);国家自然科学基金重大项目(51190102)~~

摘　　要：三相PWM变流器输出阻抗对其输出特性以及并网系统稳定性有着重要的影响。现有阻抗的研究多集中关注由变流器输出阻抗导致的交互影响问题,而对变流器本身输出阻抗特性分析较少。以三相PWM整流器为例,用小信号方法建立了整流器的开环阻抗模型以及考虑电流环和锁相环之后的阻抗模型,分析了电流环的引入对整流器阻抗的影响以及电流环参数与阻抗的关系。结果表明,与开环控制相比,引入电流环之后整流器的导纳幅值整体减小,在低频段减小的幅度与电流控制器的积分参数有关,在高频段减小的幅值与电流控制器的比例参数有关。仿真结果验证了分析方法的有效性和分析结果的正确性。The impedance of three-phase PWM converter is critical to its output character and also has influence to the whole system. The current research is mostly focused on the interaction caused by output impedance and the suppression method to the interaction. However, little literature paid attention to the output impedance itself. Using small-signal method, the impedance model of converter is established in the case of open-loop control and close-loop control considering the current loop and phase lock loop. The influence of introducing the current loop and the current control parameter on the rectifier output impedance is studied based on the small-signal model. The result shows that the introducing of current loop will reduce the amplitude of output admittance of rectifier. The decrease level in the low frequency range is mainly related to the integral parameter of current controller and the decrease level in the high frequency range is mainly related to the proportion parameter. The simulation result testifies the validity of the result.

关 键 词：等效输出阻抗 控制参数 三相PWM变流器 小信号 

分 类 号：TM46[电气工程—电器]