基于改进型PR调节器的三相PWM整流器控制

Three-phase PWM rectifier control based on improved PR regulator

应用三相PWM整流器在两相静止坐标系下电流矢量αβ分量的可解耦控制,解决了传统的基于两相旋转坐标系下三相PWM整流器控制系统电流矢量dq分量无法解耦控制的问题,提高了系统的控制性能。且采用改进型PR调节器控制代替传统的PI调节器控制能够对指定频率的交流信号实现稳态无静差跟踪控制,有效抑制低次谐波和高次谐波;相比于传统PR调节器对于系统波动过于敏感的特点,改进型PR调节器在能够保持谐振频率处的敏感度和高增益的基础上,可以增强系统稳定性。对此系统进行Matlab/Simulink仿真分析,验证了该方法的可行性。

The decoupling control of current-vector αβ components in two phase static coordinate system of three-phase PWM rectifier is applied,which solved the problem that current-vector dq components can’t be decoupled with two-phase rotating coordinate system in traditional three-phase PWM rectifier control system,and improved the control performance of the system. Astatic error tracking control of specified frequency AC signal can be realized with the improved PR regulator control instead of traditional PI regulator control,so the low-order and high-order harmonics are restrained efficiently. Compared with the character of the traditional PR regulator which is over-sensitive to system fluctuation,the sensitivity and high-gain at resonance frequency are maintained by PR regulator,and stability of the system is strengthened. The feasibility of the proposed method was verified by Matlab/Simulink simulation analysis.