基于H∞复合控制的并网逆变器控制策略研究

Research on Control Strategy of Grid Connected Inverter Based on H∞ Compound Control

为了实现对流入电网的谐波进行抑制,采用了一种电压前馈控制及H∞控制组成的复合控制为电流内环控制,PQ控制为外环控制的策略。H∞控制可以增强系统谐波的抗干扰能力,降低并网电流谐波,电压前馈控制的引入可以减小并网逆变器系统的稳态误差,提升系统的准确性。最后,通过Simulink进行仿真实验,分析引入电压前馈前后的并网电流波形,仿真结果表明所提方法能够提高并网逆变器的性能。

In order to suppress the harmonics flowing into the power grid,a current inner loop control composed of voltage feedforward control and H∞control is adopted,and PQ control is an outer loop control strategy.H∞control can enhance the anti-interference ability of system harmonics and reduce the grid connected current harmonics.The introduction of voltage feedforward control can reduce the steady state error of grid connected inverter system and improve the accuracy of the system.Finally,through Simulink simulation experiments,the grid current waveform before and after the introduction of voltage feedforward is analyzed.The results show that the proposed method can improve the performance of grid connected inverter.