基于网侧电流修正的新型LCL逆变控制器实现

The Achievement of Inverter's New LCL Controller and Reduced Order Observer Based on Grid-side Current Correction

相较于单L滤波器,LCL滤波器被广泛应用于三相大功率并网发电系统。LCL滤波器可在有效滤除高次谐波的同时减小滤波器的体积、降低滤波器的功率损耗。但使用LCL滤波器的并网发电系统的控制策略更复杂。在传统单电感控制策略的基础上,为解决LCL控制器的谐振问题,提出一种引入网侧电流修正量的新型控制器并进行分析。最后通过理论仿真和实验验证了控制策略的可行性。

Compared to single L filter,LCL filter is widely used in three-phase high power grid system,which can filter out the higher harmonics effectively and reduce the volume of the filter,while reducing the power loss of filter.But the use of LCL filter make control strategy of grid system more complicated,and there is a resonance problem.This paper proposes and analyzes a new strategy based on traditional single L filter control method to introduce the amount of correction of grid-side current to resolve the resonance problem.Finally,the theoretical simulation and experiment verify the feasibility of the new control strategy.