基于电流延时补偿的逆变器控制策略

Inverter Control Strategy Based on Current Delay Compensation

针对三电平逆变器并网系统,研究了一种基于电流延时补偿的逆变器控制策略。首先,根据三电平逆变器并网系统的拓扑,研究了一种改进空间矢量调制策略,可以有效降低共模电压。然后,研究基于电容电流反馈的有源阻尼控制方法和补偿延时的电流半周期控制策略,分析表明半周期控制策略能够避开阻抗极性跃变,提高系统稳定性。最后,通过仿真和试验验证了该方法的有效性。

An inverter control strategy based on current delay compensation is studied for the three-level inverter grid connection system.Firstly,according to the topology of the three-level inverter grid connection system,an improved space vector modulation strategy is studied,which can effectively reduce the common mode voltage.Then,the active damping control method based on capacitive current feedback and the current half-cycle control strategy based on compensation delay are studied.The analysis shows that the half-cycle control strategy can avoid impedance polarity jump and improve the stability of the system.Finally,the effectiveness of the method is verified by simulation and experiment.