三相并网变流器并联系统中载波不一致的环流抑制方法
Reduction Control of Circulating Current Caused by Different Carriers in Parallel Three-phase Grid-connected Converters
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摘要: 在分析环流产生原因的基础上,研究了由载波不同步所引起的高频环流问题,建立了一个载波周期内的环流的数学模型,提出了根据一个开关周期内高频环流的变化特性实现载波同步的方法,将高频环流的幅值限定在一定范围内。最后通过搭建变流器并联运行平台进行相关对比实验,验证了所提出的控制方法的可行性和有效性。Abstract: The high frequency circulating current caused by asynchronous carriers is studied emphatically prior to an analysis of the circulating current.The mathematical model of high frequency circulating current in the switching cycle is proposed.The carrier synchronization is realized according to the high frequency circulating current characteristics in a switching cycle,with the high frequency circulating current amplitude limited within a definite range.Finally,the experimental setup of parallel converters is built in the laboratory to verify the feasibility and effectiveness of the method proposed.
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