不平衡电网下三相PWM整流器模型预测控制及纹波抑制方法  

Model Predictive Control and Ripple Suppression Method for Three-phase PWM Rectifier Under Unbalanced Grid Condition

作　　者：胡裕峰 叶鹤松 孔亮 许榕 HU Yufeng;YE Hesong;KONG Liang;XU Rong(Jiujiang Power Supply Company,State Grid Jiangxi Electric Power Co.,Ltd,Jiujiang 332000,China)

机构地区：[1]国网江西省电力有限公司九江供电分公司,九江332000

出　　处：《电力系统及其自动化学报》2025年第1期54-63,共10页Proceedings of the CSU-EPSA

基　　金：国网江西省电力有限公司科技项目-面向新型电力系统的“光储直柔”协同技术及综合应用研究(5218D023000C)。

摘　　要：针对三相电网不平衡故障下的电压型PWM整流器的直流电压二次纹波和网侧电流谐波,研究了一种纹波抑制方法。基于传统的双闭环控制结构,提出电网不对称故障下参考电流计算方法。利用模型预测控制取代电流环PI控制,结合PWM调制环节固定开关频率,根据电流预测模型和电流误差最小原则,不仅减小了网侧电流谐波和直流母线侧电压纹波,而且降低了平均开关次数进而减少了器件损耗。通过建立的交流侧110 V、直流侧300 V、输出功率0.7 k W的实验平台进行了实验验证,表明该系统具有良好的稳态性能。仿真结果和实验结果验证了所提出控制方法的有效性以及理论分析的正确性。A ripple suppression method is studied in this paper for the DC voltage secondary ripple and grid-side cur-rent harmonics of voltage-based PWM rectifiers under three-phase unbalanced grid faults.Based on the traditional dual-closed-loop control structure,a reference current calculation method under unbalanced grid faults is proposed.The model predictive control replaces the current loop PI control,and the fixed switching frequency is realized by combin-ing the PWM modulation.According to the current prediction model and the principle of minimum current error,the proposed method can not only suppress the grid-side current harmonics and DC bus voltage ripple,but also reduce the average switching times and the losses of devices.Finally,an experimental platform of 0.7 kW output power with 110 V on AC side and 300 V on DC side was established,which had a good steady-state performance.Simulation and experi-mental results verified the effectiveness of the proposed control method and the correctness of theoretical analysis.

关 键 词：三相不平衡 三相PWM整流器 模型预测控制 

分 类 号：TM732[电气工程—电力系统及自动化]