基于动态扇区双开关表直接功率控制研究

Research on Direct Power Control Based on Dynamic Sector Dual Switch Table

在分析基于动态扇区传统直接功率控制(DPC)策略使用一张开关表导致直流侧电压和无功功率波动大的问题基础上,优化开关矢量,采用基于动态扇区改进开关表的DPC控制策略。该控制策略通过引进1个三状态滞环比较器和1个功率幅度控制函数,设计了新的动态扇区双开关表模型。该模型可以根据系统具体的功率需求,适当选择开关表及开关矢量,产生相应的开关信号控制系统的工作模式,以达到快速跟踪系统指定功率的目的;同时还改进了快速划分动态扇区的新方案。最后,通过Matlab/Simulink仿真模型和实验进行验证。仿真及实验结果表明,双开关表可以提高整流器的输出动态特性并减小无功功率纹波。

Based on the analysis of the problem that the DC side voltage and the reactive power fluctuate by using a switch table based on the dynamic sector traditional direct power control strategy,the switch vector was optimized and the DPC control strategy based on the dynamic sector improvement switch table was adopted. By introducing a three state hysteresis comparator and a power amplitude control function,a new dynamic sector dual switch table model was designed. According to the specific power demand of the system,the switch table and the switch vector could be selected properly to produce the corresponding working mode of the switch signal control system,so as to achieve the purpose of fast tracking the system specified power. At the same time,the new scheme of fast partitioning dynamic sectors was also improved. Finally,the Matlab/Simulink simulation model and experiment show that the dual switch table can improve the output dynamic characteristics of rectifier and reduce reactive power ripple.