新型三相PWM整流器自适应滞环电流控制

在传统的三相PWM整流器滞环电流控制的基础上,提出一种新型的能动态调整滞环宽度的自适应滞环电流控制技术。在锁相回路控制的基础上增加一个简单、快速的滞环宽度预测模块,可实现滞环宽度动态调制及开关频率恒定的控制。在Matlab/Simulink环境中建立三相PWM整流器的仿真模型,并以自适应滞环电流控制器对整流器进行开关频率的控制。仿真结果表明,该控制方法可以实现网侧单位功率因数正弦波电流控制,能适应负载的扰动,直流电压输出稳定,具有良好的鲁棒性。

Novel Adaptive Hysteresis Band Current Control for Three-Phase PWM Rectifier

Based on conventional hysteresis band current control of three-phase PWM rectifier,a novel adap-tive hysteresis band control algorithm featuring dynamically modulate hysteresis band was presented.A simple and quick prediction of the hysteresis band was added to a phase-locked-loop control to modulate bandwidth dynamically and ensure constant switching frequency.In the platform environment of Matlab/Simulink,the simulation modules of three-phase PWM rectifier were built,the adaptive hysteresis band current controller was integrated into the recti-fier to control switching frequency,the simulation result indicated that the designed technique had the characteris-tics of drawing nearly sinusoidal current with unity power factor,adapting to load variation,stable DC voltage output and good robustness.