基于DPC-SVM控制的三電平PWM整流器仿真研究

摘要：直接功率控制（DPC）和電壓定向矢量控制（VOC）是PWM整流器常用的控制技術。DPC控制動態響應比較快，但其穩態性比較差，而且開關頻率不固定，給濾波器的設計帶來困難。VOC控制精度高，但算法實現比較復雜。在此基礎上提出了一種空間電壓矢量控制與直接功率控制結合的控制策略，即DPC-SVM。該控制結構為直流輸出電壓外環，功率控制內環，無功功率參考值設為0，以達到單位功率因數，設計了功率環的參數，對系統進行了仿真研究。結果表明，所提出的控制技術有好的動靜態性能，直流母線電壓超調量小，電流諧波總畸變率小，并且彌補了直接功率控制和電壓定向矢量控制的缺點。
敘詞：三電平 PWM整流器 直接功率控制 電壓定向矢量控制 Abstract：Direct power control (DPC) system and conventional voltage oriented control (VOC) system are often used to control rectifiers. The dynamic performance of DPC is better, but the steady performance is not so good. and the switching frequency of DPC is changeable, and it brings difficulties in designing the filters. VOC is better in that two aspects, but it is difficulty .So this paper researches into a control method of DPC combined with space vector modulationDPC-SVM. The new method uses closed-loop DC voltage control as outside control and closed-loop power control as internal control, and gets analyze result by Simulink software on the base of math model. It is shown that the new strategy exhibits less deviation of the current, and the dynamic performance of is better as well as the steady performance. As a result, the new method can set off disadvantages of DPC and VOC. Keyword：Three-level , PWM Rectifier , Direct power control , Voltage oriented control