三相电压型PWM整流器的稳定性研究  

Research on the Stability of the Three-phase Voltage Source PWM Rectifier

作　　者：钟炎平[1] 陈耀军[1] 吴胜华[1] 

机构地区：[1]空军预警学院,湖北武汉430019

出　　处：《电气自动化》2013年第2期10-12,共3页Electrical Automation

摘　　要：对三相电压型PWM整流器在整流和有源逆变两种工作状态下的稳定性进行了研究。通过对闭环传递函数的研究,指出在采用线性PI控制时,PWM整流器存在一个随负载变化的可变极点,因而系统的动态性能随负载的不同而改变,并且在有源逆变工作状态下系统存在不稳定极点。探讨了PI控制器比例增益对系统稳定性的影响,指出比例增益在整流状态下不能太高,在有源逆变状态下不能太低,因此在设计整流器控制参数时应综合考虑。The stability of the three-phase-voltage-source PWM rectifier which works in rectifier and regenerative operating modes is studied in this paper. With the closed loop transfer function it would be found that a changeful pole which can move with the load exists in the system and the dynamic performance would change with the load. When the PWM rectifier works in regenerative operating mode the changeful pole would become an unstable pole. The system stability causing by the gain of the PI regulator is discussed, and it is pointed that the proportion gain can not get too large in rectifier operating mode and too small in regenerative operating mode, so the design of the control parameter for the PWM rectifier must be gotten a balance.

关 键 词：PWM整流器 稳定 控制 根轨迹 传递函数 

分 类 号：TM464[电气工程—电器]