电工技术学报2012，Vol.27Issue(4)：110-116,7.
无阻尼LCL滤波器的并网变流器稳定性控制策略
A Stability Control Strategy for PWM Converter With Undamped LCL-Filter
摘要
Abstract
LCL filter is more and more widely used in PWM converter connected to the grid for its good filter performance.However,it can easily cause the system unstable due to resonances in the underdamping,which make it difficult to maintain the system stable without additional damping.The influence of the AC-side current sampling point and sampling frequency on the stability of current loop is systematically studied based on the mathematical model of the three-phase PWM converter with undamped LCL filter,and then a novel stability control strategy is proposed i.e.amplitude frequency characteristic and phase frequency of control object are improved by regulating sampling frequency to control phase-lag of digital system delay so as to achieve system stability.Simulation and experimental results effectively verify its validity and feasibility.关键词
PWM变流器/LCL滤波器/无阻尼/采样频率/稳定性Key words
PWM converter/LCL filter/without damping/sampling frequency/stability分类
信息技术与安全科学引用本文复制引用
李军,李玉玲,陈国柱..无阻尼LCL滤波器的并网变流器稳定性控制策略[J].电工技术学报,2012,27(4):110-116,7.基金项目
教育部新世纪人才资助计划 （）
国家自然科学基金（50707030）资助项目 （）
