【摘要】 提出了一种用于大容量调速系统的级联型PWM整流器新拓扑。与传统调速系统结构相比,该拓扑可以直接与电网连接,省去体积、重量极大的移相变压器,具有重要实际意义。根据该拓扑电路的电压电流关系,建立了数学模型,在此基础上,研究级联型PWM整流器的控制方法,并分析了电流、电压调节器的工作原理,提出直流母线电压平衡的控制策略。仿真结果验证控制方法的有效性。更多还原

【Abstract】 A new cascade H-Bridge PWM rectifier topology was presented.Compared to the traditional H-Bridge converter topology in high power electric drive systems,the new cascade rectifier allows the elimination of heavy and bulky transformer,reducing the cost.The mathematical model of the rectifier was established and the operating principle was discussed,based on which the control methods especially the voltage balancing strategies was proposed.Simulation results verify the validity of the method.更多还原