基于电流重构的PWM整流器控制研究

在深入研究PWM 整流器拓扑和数学模型的基础上，提出一种基于相电流重构和虚拟磁链的PWM 整流器无传感器控制策略。三相交流电流可根据直流母线电压和开关管信号进行重构，重构电流进行调理滤波后可用于建立虚拟电网磁链从而估算出坐标变换所需的角度信息。该控制策略不仅可作为无传感器控制系统独立运行，也可作为传统PWM 整流器的一种备用控制方案，降低因传感器故障造成的影响，提高系统的可靠性。实验部分搭建了基于RT‐LAB半实物实时仿真硬件电路和 TMS320F28335数字处理器的实验平台，实验结果证明了该控制策略的正确性和可行性。

Control Strategy research based on current reconstruction for PWM rectifier

The control strategy is proposed after deep research of the topology and mathematical model of PWM rectifier ,which is based on phase current reconstruction and virtual flux .The three‐phase alternating current can be reconstructed according to the DC bus voltage and switch signal .After conditioning filter ,the reconstructed current can create a virtual grid flux to get the information needed to estimate the angle of voltage and current for coordinate transformation .The control strategy can not only be used as an sensorless control strategy for PWM rectifier ,but also can be use as an alternate control strategy to reduce the impact caused by sensor failure and improve the reliability of system .The experimental platform was designed which is based on RT‐LAB real‐time simulation hardware circuitry and digital processors TMS320F28335 .The experiment result shows the correctness and feasibility of this control strategy .