对于电压源型三相并网逆变器,采用LCL滤波比L滤波效果更佳。但LCL滤波器存在谐振问题,通常采用滤波电容支路串联电阻的方法进行抑制,电阻上存在附加损耗。为避免电阻损耗,可通过调整电流环结构实现与之类似的阻尼效果。针对数字反馈控制滞后的问题,提出一种改进型有源阻尼方法,并将其与其他方法的异同进行对比。最后,以7.2 k V·A三相4桥臂逆变器作为实验平台,通过实验结果验证了该方法的有效性。
【英文摘要】
For three phase voltage source grid connected inverter,LCL filter is more effective than L filter. ButLCL filter exists inherent resonance. Resistor in series with filter capacitor is adopted to avoid this problem. The loss ofresistor is not negligible. In order to avoid this loss,changing the structure of current loop is adopted to achieve thesimilar effect. Presented a improved active damping method,which aimed at the digital feedback control delay. Andthen its characteristics was compared and analyzed wi...
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