三相整流器直接功率控制方法研究

Study of the Direct Power Control Method Based on the Three-phase Rectifiers

根据直接功率控制原理,分析了瞬时有功功率和无功功率对于三相PWM控制系统的作用,并根据坐标变换理论得到了瞬时有功功率和无功功率.另外,为了减少误差,在瞬时有功功率分析中引入了电流补偿.最后根据传统的开关表对系统进行控制.仿真结果进一步说明了所用方法的合理性和有效性.

Basing on the control principle of direct power,the influence of the instantaneous active power and reactive power on the three phase PWM control system is analyzed,and the instantaneous active power and reactive power according the coordinate transformation theory is obtained.Furthermore,in order to reduce errors,the current compensation was introduced in the analysis of the instantaneous active power.Finally the traditional switching table was used to control the system.The simulation results further indicate this method is reasonable and valid.