基于有源阻尼器的并联逆变器集群集中式谐振抑制策略

为应对并联逆变器集群系统接入配电网所引起的的谐振问题,文中提出了一种基于有源阻尼器的谐振抑制策略。有源阻尼器通过对系统谐振频率的检测,只在谐振频率处添加一并联谐波电导,动态的增加系统阻尼,有效治理系统的谐波谐振。同时,文中还引入了准PR控制,克服了光伏集群接入对传统的PR控制器稳态误差和鲁棒性能带来的不利影响。文中所述控制策略在不改变原有逆变器硬件结构和控制算法的基础上,利用并联有源阻尼器灵活地抑制系统的并联谐振。最后通过算例,在MATLAH/Simulink中验证了为重所提的基于有源阻尼器的谐振抑制策略的的正确性和有效性。

A Centre Resonance Mitigation Strategy for Clustered Grid-connected PV Inverters Based on Hybrid Active Damper

In order to deal with resonance problem caused by the access of clustered PV inverters, this paper proposes a resonance mitigation control strategy based on hybrid active damper.The proposed strategy only added parallel harmonic conductance in resonance frequency using the resonance detection method, which increases the system damping dynamically, and controls the harmonic resonance effectively.Meanwhile, the proposed control strategy also introduced quasi PR control to overcome the challenges of steady-state error and robustness caused by the clustered PV inverters.The proposed control strategy in this paper, on the basis of without changing the original hardware structure and control algorithm, inhibits the paralleled harmonic resonance flexibly by using parallel active damper.Finally, the effectiveness of the proposed control strategy is validated in MATLAH/Simulink.