中文摘要：

为厘清现有LCL滤波器的有源阻尼方法之间的关系和寻找新的有源阻尼结构,研究了抑制LCL谐振的有源阻尼方法的综合方法,构造基于反馈的有源阻尼统一分析模型,对采用单状态变量单补偿器反馈的有源阻尼方法进行了系统分析。通过传递函数和根轨迹图甄别出有效有源阻尼方法,详细分析了滤波电容电压反馈、滤波电容电流反馈和提出的网侧滤波电感电压反馈3种有源阻尼方法的特性。建立了3 kW实验样机对3种有源阻尼方法进行了性能对比研究,结果验证了有源阻尼综合方法的有效性。

英文摘要：

The synthetic AD（Active Damping） method of grid-connected inverter with LCL-fiher is studied to clarify the relationship between its existing AD methods and discover new AD structures. The unified feedback-based analytical model is established,the AD structures based on single state-variable and single compensator are systematically analyzed,and the effective ones are identified according to the transfer function and root locus chart. The characteristics of three AD technologies are analyzed in detail：filter capacitor voltage feedback,filter capacitor current feedback and the proposed grid-side inductor voltage feedback. With a 3 kW prototype,the comparison of performance among three AD technologies proves the effectiveness of the synthetic AD method.