提高PWM整流器抗负载扰动性能研究  

Research on Improvement of Anti-Disturbance Performance for Three-Phase PWM Rectifiers

作　　者：赵仁德[1] 贺益康[1] 刘其辉[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2004年第8期67-72,共6页Transactions of China Electrotechnical Society

基　　金：国家十五863资助项目(2001AA512023-3)。

摘　　要：提高PWM整流器抗负载扰动能力、减少直流母线电容量是PWM整流器重要的研究内容。文章首先深入分析了PWM整流器在传统带负载前馈的双闭环控制方式下负载突变时动态 响应受限制的问题,提出了稳态采用带负载前馈的双闭环、瞬态采用0*qi变结构控制的改进方 案,有效地提高了PWM整流器抗负载扰动的能力。其次在对PWM整流器动态分析的基础上, 提出了直流母线电容准确计算的解析表达式。仿真结果验证了变结构控制的有效性和母线电容计算的正确性。It is important to improve the anti-disturbance performance of three-phase voltage-source PWM rectifier and to reduce the capacitance of the dc-link capacitors. In this paper, the dynamic response limited problems of the PWM rectifier controlled by the traditional voltage and current doubly feed-back loops with the load current feed-forward compensation under output load sudden change was deeply examined and an improved control scheme was put forward firstly, in which the doubly feed-back control with load current feed-forward was used in the steady-state and the 0*qi structure-variable control was employed in the transient state in order to effectively enhance the anti-disturbance ability of the PWM rectifier. Secondly, based on the dynamic analysis of the PWM rectifier, a precise analytical expression for the computation of the dc-link capacitance was suggested. The effectiveness of the Structure-Variable Control Scheme and the correction of the dc-link capacitor computation were all verified by the computer simulation study.

关 键 词：PWM整流器 抗负载扰动 变结构控制 母线电容 交流励磁 

分 类 号：TM461[电气工程—电器]