摘要
分析了PWM整流器虚拟磁链直接功率控制(DPC)的工作原理与特性;针对由于传统开关表构造的不足导致系统调节能力不稳定的问题提出了一种基于虚拟磁链的PWM整流器直接功率控制新调制策略,通过重新构造开关表的方法来改进整流器的调节能力与输入输出性能。仿真结果表明,该调制方法使无功电流在靠近整流器电压矢量附近区域内的失控现象得到明显削弱,能够有效地对有功功率和无功功率进行控制,使整流器更接近单位功率因数运行。
The paper analyzed working pr nc e and characteristics of virtual flux direct power control for PWM rectifier. It put forward a novel modulation based on virtual flux in order to resolve the problem of strategy of direct power control of PWM rectifier unsteady of system adjustment caused by structure deficiecy of traditional switching table, which through restructure switching table to improve adjustment ability and characteristics of input and output of rectifier. The simulation result showed that the novel strategy can weaken the phenomenon that reactive current is out of control near the voltage vector, control active power and reactive power effectively and ensure rectifier operates under unit power factor.
出处
《工矿自动化》
2009年第11期41-45,共5页
Journal Of Mine Automation
