一种基于有源阻尼的光伏上网谐振抑制方法

A Resonance Suppression Method for Photovoltaic Grid System Based on Active Damping

为了解决光伏逆变系统产生谐振、造成能量损耗、影响电能质量的问题,利用电容电流反馈抑制谐振的特性,提出一种有源阻尼的光伏上网谐振抑制方法.通过系统阻尼系数确定电容等效并联阻值,通过根轨迹法设计比例谐振控制器参数.在Matlab/Simulink中搭建仿真模型,结果表明基于电容电流反馈的有源阻尼方式能有效抑制谐振,且能在各种负载情况下稳定地输出高质量电压波形,具有较好的动态性能和鲁棒性.

For the resonant spike problem of photovoltaic inverter system,an active damping mode based on the capacitive current feedback is proposed to suppress the filter resonant.The capacitance equivalent parallel resistance value is determined by the system damping coefficient,and the proportional resonant controller parameters are designed by the root trajectory method.A simulation model is built in Matlab/Simulink,which proves that the active damping method based on capacitive current feedback can suppress resonance effectively and stably output high quality voltage waveform under various loads.The system has good dynamic performance and robustness.