【摘要】 针对三相电压型PWM整流器受到负载扰动和电网波动的影响较大问题,在分析其数学模型的基础上,根据输入输出之间的功率平衡关系,提出了一种改进的前馈控制策略。前馈信号同时包含了电网电压和负载的信息,通过快速调节交流侧进线电流,使得系统功率平衡得以维持。在所搭建的实验室平台上做了相应的模拟实验,验证了控制策略的有效性,提高了系统对负载扰动和电网波动的抗干扰能力。更多还原

【Abstract】 Since three-phase voltage source PWM rectifier is vulnerable to the disturbance of both load and grid voltage,an improved feedforward control strategy is proposed based on the power balance relationship between the input and output of rectifier,which is deduced according to the mathematic model of the rectifier.Feedforward signal includes the information of both grid voltage and DC side load.Power balance between the input and output can be maintained by adjusting AC side currents.Experiments have been done on the laboratory platform and results verify the effectiveness of the control strategy proposed.Robustness of the rectifier to the disturbance of both load and the grid voltage has been improved.更多还原