【摘要】 传统背靠背双PWM换流系统中,当电网电压或负载状态突变时,直流母线电压波动幅度较大,若控制不当,将严重威胁系统的安全可靠运行。根据瞬时有功功率平衡关系,提出了一种功率前馈的抑制直流母线电压波动控制方法。通过建立负载状态前馈通道,将负载瞬时有功功率直接前馈到网侧瞬时有功功率控制环节,有效抑制了直流母线电压的波动,提高了系统的动态性能。搭建了Matlab/Simulink仿真模型及实验平台,对有、无功率前馈控制的直流母线电压波动情况进行了对比,结果表明,功率前馈控制策略可有效抑制直流母线电压波动。更多还原

【Abstract】 In traditional back-to-back dual-PWM converter system,when the grid voltage or load state changes suddenly,DC-bus voltage has large fluctuations,threating the safe operation of the system.A control method of DC bus voltage based on power feedforward is put forward,according to the instantaneous active power balance.In this strategy,the load active power was directly fed-forward to the grid-side given instantaneous active power node through a constructed load state feedforward channel.So,the DC-bus voltage fluctuation was inhibited effectively and the dynamic performance of the system had improved.Simulation model by Matlab / Simulink simulation platform and experimental platform are set up and the DC bus voltage fluctuations are contrasted.The results show that the power feedforward control strategy can effectively suppress the DC-bus voltage fluctuations.更多还原