新型双钳位三电平PWM整流器双平衡调制策略研究  

Research on double-balanced modulation strategy of the new twin-clamp three-level PWM rectifier

作　　者：石振刚 吴跃斌 孙冲 张林浩 武超飞 李涵 Shi Zhengang;Wu Yuebin;Sun Chong;Zhang Linhao;Wu Chaofei;Li Han(Electric Power Research Institute of State Grid Hebe Electric Power Co.,Ltd.,Shijiazhuang 050021,China.;State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050021,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021 [2]国网河北省电力有限公司,石家庄050021

出　　处：《电测与仪表》2022年第1期183-189,共7页Electrical Measurement & Instrumentation

基　　金：国网河北省电力有限公司科技项目(KJ2019069)。

摘　　要：针对传统二极管钳位三电平整流器存在桥臂内侧开关关断过电压及直流侧中点电位偏移的问题,对一种新型高压、大功率双钳位三电平整流器进行了研究。分析了其工作原理及双钳位工作机制,推导出其在旋转坐标系下的数学模型,根据电流路径不能突变的特点,提出了能够同时满足直流侧电容及钳位电容电压平衡的“双平衡”调制方法。并通过MATLAB仿真和基于DSP+FPGA控制器样机的实验验证,结果均证实了“双平衡”调制方法的正确性及新型拓扑结构的可推广性。Aiming at the traditional diode clamped three-level rectifier has the problems of switching off over-voltage on the inner side of bridge arm and the deviation of neutral point potential on the DC side,a new type of high-voltage and high-power double-clamp three-level converter is studied in this paper.Its working principle and double clamp mechanism are analyzed,and its mathematical model in rotating coordinate system is deduced.According to the characteristic that the current path cannot be changed abruptly,a double balance modulation method is proposed,which can satisfy the voltage balance of DC side capacitance and clamp capacitance at the same time.Simulation and experimental verification are conducted through MATLAB simulation and DSP+FPGA based controller prototype,and the results show that the double balance modulation method is correct and the new topology can be extended.

关 键 词：双钳位 双平衡调制 电流通路 抑制过电压 中点电位 

分 类 号：TM33[电气工程—电机]