有源前端变频器中PWM整流器的仿真研究

Simulation Research of PWM Rectifier in Active Front End Drive

为了减小船舶电力系统中的谐波干扰和实现船舶制动时能量回馈,有源前端(Active Front End,AFE)变频器逐渐在电力推进船舶中得到应用。针对AFE变频器的关键部件PWM(Pulse Width Modulation)整流器进行了研究,在建立三相电压型PWM整流器数学模型的基础上,采用前馈解耦控制策略,实现了有功功率和无功功率的解耦控制。通过PSCAD/EMTDC(Power System Computer Aided Design/Electromagnetic Transient in DC Sys-tem)软件环境下的仿真研究,对单位功率因数整流和有源逆变进行了比较,表明PWM整流器可以实现能量双向流动,控制系统具有较好的动态性能。

To minimize harmonic interference and realize energy-feedback during braking, active front end（AFE）drives have been gradually applied in electric propulsion ships. The PWM rectifier as a key component for AFE drive is studied. In order to decouple active power and inactive power, feed-forward controller is designed based on a mathematical model of three-phase voltage source PWM rectifier. Through simulation with PSCAD/EMTDC software, unit power factor rectifiers and active converters are compared. The results show that PWM rectifier can realize bi-directional energy flow and improve the dynamic performance of the controller.