实时电流跟踪型并网逆变器谐波抑制方法

Approach of Harmonic Suppression for Real-Time Current-Tracking Grid-Connected Inverter

提出了一种改进的带非线性负载的三相并网逆变器谐波抑制方法,此方法不仅简单,而且与传统的谐波抑制方法相比具有较强的鲁棒性.利用检测电流的方式以及两个PI控制器的调节作用实现谐波电流的实时跟踪.通过Matlab/Simulink仿真结果表明提出的实时电流跟踪型并网逆变器谐波抑制策略不仅可以抑制非线性负载带给电网的谐波干扰,而且当负载大小变化后仍可以实现有效抑制.

An improved approach of harmonic suppression oI three-phase grid-connected inverter with nonlinear load is proposed. It is not only simple but also the robustness is stronger than the conventional harmonic suppression method. The mode of current detection and the adjusting of two PI controllers are used to achieve the real-time harmonic current tracking. The results of simulation by Matlab/Simulink show that the method of harmonic suppression for real-time current-tracking gridconnected inverter proposed can not only restrain the harmonic interference, which is given by the nonlinear load, but also implement efficacious suppression even though we change the magnitude of the load.