基于QPR与TD-FUZZY-PI双闭环单相PWM负载控制策略研究

Study on Control Strategy of Single-phase PWM Load Based on Double Closed-loop of QPR and TD-FUZZY-PI Controller

针对PWM整流电路中晶闸管器件的特点及系统参数随环境的摄动造成直流电压输出不理想的问题,提出了新的双闭环控制策略,即电压外环采用跟踪-微分器+参数自整定模糊PI(TD-FUZZY-PI)控制,电流内环采用准比例谐振(QPR)控制,并对所用控制策略进行了仿真分析。仿真结果表明:文中方法较传统双闭环PI控制不仅过渡过程具有良好的动、静态特性,波形质量明显得到改善;而且电流内环实现了正弦量幅值和相位的无静差调节,提高了功率因数。

According to the characteristics of the thyristor devices of PWM rectifier circuit and system parameters perturbation with the environment DC voltage output is not ideal. This paper presented a new double closed-loop control strategy. Under the mode of voltage and current double closed-loop control structure, the voltage loop adopted tracking differentiator ＋ parameters self-tuning fuzzy PI （TD-FUZZY-PI） control, current inner loop used quasi proportional resonant （QPR） control, and the control strategy was used for simulation analysis. The simulation results show that not only transition process has good dynamic and static characteristics, the waveform quality was improved obviously, but also the astatic adjustment of amplitude and phase sinusoidal in the current inner loop is achieved, improving the power factor under the control of the proposed method compared with traditional double closed-loop PI.