基于改进型SVPWM滞环控制并网逆变器优化研究

Research on Optimization of Grid-Connected Inverter Based on Improved SVPWM Hysteresis Control

永磁驱动系统采用直流端并网回馈时,针对并网逆变器对瞬态能量回馈时直流母线电压骤升较大,并网电流谐波畸变率高,采用传统双闭环PI控制策略无法获得理想效果。为此结合SVPWM和滞环控制的优点,提出了一种改进型并网逆变器SVPWM滞环控制策略,有效抑制了直流母线泵升电压峰值,降低了并网电流谐波畸变率,仿真验证了控制策略正确性。

When the permanent magnet drive system adopts DC end-connected feedback,the DC bus voltage rises sharply when the grid-connected inverter feeds back the transient energy,and the harmonic distortion rate of the grid connected current is high,and the traditional double closed-loop PI control strategy cannot obtain the ideal effct.Therefore,com-bined with the advantages of SVPWM and hysteresis control,an improved grid-connected inverter SVPWM hysteresis cont rol strategy is proposed.This strategy effectively suppresses the peak voltage of the DC bus pump and reduces the harmonic distortion rate of the grid connected current.The simulation verifies the correctness of the control strategy.