有源阻尼技术是实现LCL滤波器谐振峰值抑制的有效方法,目前已经有多种有源阻尼方案被提出。但已有文献对有源阻尼方案进行分析时均未涉及有源阻尼的机理问题,未给出各方案提出的依据。该文深入分析有源阻尼技术,指出有源阻尼实质上是对系统谐振峰值附近对应的输出频率成分的反馈控制,当该反馈为负反馈时可以实现较好的抑制效果,且反馈深度越深,谐振峰值抑制效果越好。在此基础上,不仅解释了现有基于逆变器侧电感电流、滤波电容电流及其电压反馈控制的有源阻尼技术的本质,还得到了基于包括滤波电容、逆变器侧电感以及网侧电感在内的有源阻尼反馈环节的设计要求,并推演了LCL滤波并网系统中可行的有源阻尼控制方案。实验结果验证了理论分析的正确性。 Active Damping is an effective method to suppress the resonant peak of LCL filter. So far, a variety of active damping schemes have been proposed. However, the existing literature does not refer to the mechanism of active damping when analyzing the active damping solution, and does not provide any basis for the proposals. This paper analyzes the active damping technology in-depth, and points out that the active damping is essentially the feedback control of the corresponding output frequency components near the resonance peak of the system. When the feedback is negative feedback, the better damping effect can be achieved and the deeper the feedback depth , The better the resonance peak suppression effect. On this basis, it not only explains the essence of the existing active damping technology based on the inverter side inductor current, the filter capacitor current and its voltage feedback control, but also based on including the filter capacitor, inverter side inductance and network side Inductance of the active damping feedback, including the design requirements, and deduced LCL filtering and grid system feasible active damping control scheme. The experimental results verify the correctness of the theoretical analysis.