PWM整流器18扇区控制算法的研究

A control strategy of PWM rectifier based on 18 sectors

通过仿真分析了传统直接功率控制系统的原理及性能,并在PWM整流器的功率数学模型下分析了各开关矢量对瞬时功率的不同影响。在Matlab/Simulink环境下,搭建了基于18扇区的通用开关表直接功率控制系统的仿真模型,并与传统的开关表控制进行比较。仿真结果表明:基于18扇区的控制系统明显改善了对无功和有功的调节能力,系统控制性能得到了提高,同时验证了基于18扇区开关表控制策略的可行性。

The principle and properties of the direct power control （DPC） system for present three-phase boost type PWM rectifiers based on its Simulink model were analyzed. The instantaneous power mathematical model was introduced. The influences on instantaneous power exercised by all the six power switches were studied. In Matlab/Simulink environment, a new direct power control system simulation model was built based on 18 sectors, which was compared with the traditional switch table. Simulation results show that the new DPC system has a good control capability of the active and reactive power. Meanwhile, the new control strategy is proved feasible by Simulink.