双PWM变换器的功率快速平衡控制

Fast Power-balancing Control for Dual PWM Converters

研究了一种用于双PWM变换器的直流母线功率平衡控制方法。该方法根据网侧和机侧变流器数学模型推导出各自的功率微分方程,并在网侧变流器控制中引入机侧变流器功率微分,使得网侧变流器功率及时跟踪机侧变流器功率让直流母线电容功率保持不变;为简化负载功率微分的计算,永磁同步电机采用IP控制方法。同时,为了更好地稳定直流母线电压,在网侧变流器的外环控制中采用直流母线电压的控制方法,从而在直流母线电容容量较小时,直流母线电压仍保持稳定。仿真及实验结果验证了所提出的控制方法的有效性及优越性。

A dc-link power-balancing control method is applied to a dual PWM converters system.Based on the converter and inverter power differential equations derived by their mathematical model,the strategy is to fully utilize the inverter dynamics in controlling the converter dynamics so that the converter power matches the required inverter power exactly and thus the dc-link capacitor power can keep invariant.To simplify the calculation of the load power differential,the IP control method is used in the permanent magnet synchronous motor.At the same time,in order to keep the dc-link voltage more stable,the outer loop of the converter is the dc-link voltage control.So the dc-link voltage remains stable even a very small amount of the dc-link capacitance is used.Simulation and experimental results verify the effectiveness and superiority of the proposed method.