摘要
在PWM整流器的众多控制策略中,直接功率控制(DPC)策略的应用越来越广泛。目前常用的一种直接功率控制方法是采用瞬时功率和开关表相结合的不定频直接功率控制,这种方法计算功率时需要较多传感器测量线路电压电流,导致控制系统结构复杂、抗干扰能力差。针对上述问题,提出了一种基于虚拟磁链定频直接功率控制方法,并有效地与空间电压矢量(SVM)相结合,在简化控制电路结构的同时提高了控制策略的精度。通过对2种直接功率控制方法的对比仿真,验证了定频直接功率控制具有更好的动、静态控制性能。
Direct Power Control（DPC） has been used more and more widely in PWM rectifier control strategies. At present, a typical direct power control method is indefinite frequency based on instantaneous power and switching table. This method needs many volt- age and current measurement sensor to compute power,leading to complex control system structure, poor anti-inteKerence ability. A direct power control of fixed switching frequency is proposed which is based on virtual flux and voltage space vector （SVM）. It re- duces the number of the sensor, simplifies the control circuit structure and improves the control precision. The simulation results of two methods in Matlab/Simulink show that direct power control with constant switching frequency power has better dynamic and static control performance compared with uncertain frequency direct power control method.
出处
《陕西电力》
2017年第5期64-68,74,共6页
Shanxi Electric Power
