中文摘要：

针对LCL滤波器的谐振峰特性会导致系统不稳定、中大功率变流器中无源阻尼方法的阻尼损耗会引起严重发热问题，根据LCL滤波器的传递函数和电容支路电流对系统阻尼的影响，提出一种电容支路电流反馈有源阻尼策略和反馈参数设计方法。研究了电容支路电流反馈有源阻尼策略对系统谐振峰增益和开关频率处增益的影响，将该有源阻尼策略和无源阻尼法进行了对比研究。得出电容支路电流反馈有源阻尼控制策略反馈参数的设计方法。对带有LCL滤波器的并网逆变器进行了仿真研究，仿真结果表明这种有源阻尼策略能有效抑制LCL滤波器的谐振峰，降低输出电流在谐振频率处谐波，增加系统的稳定性。

英文摘要：

LCL filter resonance peak characteristics bring about system instability. In media and high power converter, loss of passive damping method causes serious problem of fever. An active damping control strategy of capacitor current feedback and design method was proposed based on the transfer function of LCL filter and the impact of capacitor current on the damping of the system. The impact of the proposed active damping strategy on system resonance peak gain and switching frequency gain was researched. Design method of feedback parameter in active damping strategy was obtained by comparing the active damping strategy with the reactive damping method. Simulation results of grid - inverter show that this active damping strategy restrains the resonance peak, reduces harmonics at resonance frequency and increases the stability of the system.