基于虚拟磁链的三电平PWM整流器定频DPC

Research on the DPC With Fixed Switching Frequency of Three-level PWM Rectifier Based on Virtual Flux

将基于新颖的虚拟电网磁链定向的定频直接功率控制(DPC)策略应用于三电平PWM整流器,不仅可以固定开关频率,简化滤波器设计,而且通过构造出来的虚拟电网磁链作为定向矢量,可以很好地抑制谐波和干扰,实现对PWM整流器的高动态性能控制。重点对传统虚拟电网磁链中存在的两方面不足,即虚拟电网磁链估算中存在的积分初值问题和初始角观测问题,分别提出了改进措施。最后通过仿真和实验验证了观测方法的正确性和控制策略的有效性。

Based on novel virtual grid flux-oriented, this paper applies a direct power control（DPC） with fixed switch- ing frequency to three-level PWM rectifier, which not only can fix switching frequency, simplify the design of filter, but also can restrain harmonic and interference effectively through the virtual grid flux as the oriented vector, thus re- alize the high dynamic performance control of PWM converter.And the focus of this article is to put forward the im- provement measures of two shortcomings existed in the traditional virtual grid flux.Finally,the experimental results verify the correctness of the observation methods and the effectiveness of the control strategy.