三相电压型PWM整流器无电流传感器控制策略研究

摘要

三相电压型PWM整流器有间接电流控制和直接电流控制两种方式，两种控制方式各有优点。根据三相电压型PWM整流器的高频动态数学模型，提出了基于开关函数检测的无电流传感器控制策略。该控制策略兼有间接电流控制结构简单，成本低和直接电流控制动态响应速度快、限流容易、控制精度高等优点。实验结果验证了控制策略的可行性。%There are two basic control schemes for three-phase voltage-source PWM rectifier: the direct current control and indirect current control. The direct current control scheme achieves better dynamic and steady state performance, but its control cost is much higher than the indirect current control. Based on the dynamic high frequency mathematical model of three-phase voltage-source PWM rectifier, a novel sensorless current control strategy is presented for the first time, which is implemented by estimating the variables of the three-phase input current via other variables. The control strategy has super characters such as simple structure, low cost, good dynamic and steady state performance and ability to limit the input currents. A simple hardware implementation is proposed and the good experimental results are reported to confirm the quality of the presented strategy.