一种电流源型并网逆变器的有源阻尼控制策略

An active damping control strategy for grid-connected current source inverter

针对微网中电流源型并网逆变器中滤波器自身谐振问题,比较分析了无源阻尼和有源阻尼谐振抑制方法,提出了一种基于输出滤波电容谐波电压检测的有源阻尼控制策略,给出一种虚拟电阻计算方法.基于该控制策略建立了系统仿真模型.仿真结果表明,应用有源阻尼控制方案可很好地抑制滤波器自然谐振频率附近由逆变器输出高次谐波电流及由电网谐波电压在滤波器中产生的谐振.

This paper,in accordance with the deep analysis of resonance suppression methods of passive damping and active damping,proposes an active damping control strategy on the basis of harmonic voltage detection on output capacitor voltage and forwards a virtual resistor calculation method.An inverter system simulation model is set up and gained simulation results demonstrate that the resonance,which triggered by harmonic current form inverter side or harmonic voltage from grid side,can be well suppressed around the nature resonance frequency of output filter.