基于空间矢量的PWM整流器直接功率控制

Direct power control with constant switching frequency for PWM rectifier

为克服传统型直接功率控制开关频率不固定的缺点,提出了一种基于空间矢量调制的三相Boost型PWM整流器直接功率控制策略(DPC-SVM)。用虚拟磁链估计器代替电压传感器,运用瞬时功率理论,估算虚拟磁链来计算有功和无功功率,采用电压外环和功率内环的控制方式,并做了仿真研究。研究和分析表明,DPC-SVM的应用使系统具有结构和算法简单、动态响应快、高功率因数、开关频率固定和低谐波等特性。

In order to overcome the unstable frequency of traditional direct power control switching,a novel and simple direct power control of three-phase pulse-width-modulated rectifiers using space-vector modulation（DPC-SVM） was introduced.The line voltage sensors were replaced by a virtual flux estimator.The instantaneous power theory was applied to calculate the active and reactive power by estimating the virtual flux,the voltage of outer and inner power control mode was adopted and a simulation study was done.The results show that the application of DPC-SVM make the system own the features,like simple structure and algorithm,good dynamic response,high power factor,constant switching frequency and low harmonic.