不平衡电网下单向能流三相三电平整流器的控制策略研究  

Control strategy of unidirectional three-phase three-level rectifier under unbalanced grids

作　　者：宋倩倩 袁巍 孟天帅 程红[1] 王聪[1] SONG Qianqian;YUAN Wei;MENG Tianshuai;CHEN Hong;WANG Cong(School of Mechanical and Electrical Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)机械与电气工程学院,北京100083

出　　处：《煤炭工程》2025年第3期172-179,共8页Coal Engineering

基　　金：国家自然科学基金项目(51577187);中央高校基本科研业务费“中国矿业大学(北京)博士研究生拔尖创新人才培育基金”(BBJ2024065)。

摘　　要：针对煤矿井下电网电压不平衡等工况下,矿用变频器系统可能出现单相电流过大、输入电流谐波增大等问题,以单向能流三相三电平矿用变频器前级整流器为研究对象,在分析该整流器拓扑工作原理和数学模型基础上,结合不平衡电网下的正、负序电压电流双闭环独立控制和相内电压均衡控制策略,研究并提出了一种采用零序电压反馈和负序电流前馈控制相结合的三层控制策略,实现了整流器单位功率因数运行,并解决了相间直流母线电压均衡问题。最后通过Matlab/Simulink仿真,验证了所提控制策略的有效性和可行性。Aiming at the problems of excessive single-phase current and increased input current harmonics that may occur in the mining converter systems under voltage unbalance of the underground coal mine grids,we took the unidirectional three-phase three-level mining converter front rectifier as the object of research,on the basis of analyzing the rectifier topology working principle and mathematical model,we combined the positive and negative sequence voltage and current double closed-loop independent control with the inner-phase voltage equalisation control strategy under the unbalanced grids,and proposed a three-layer control strategy combining the zero-sequence voltage feedback and the negative-sequence current feedforward control,which realized the rectifier's unit power factor operation and solved the problem of mutual-phase DC bus voltage equalisation.Finally,the Matlab/Simulink simulation was used to verify the effectiveness and feasibility of the proposed control strategy.

关 键 词：电网电压不平衡 整流器 零序电压 负序电流 相间电压 

分 类 号：TD608[矿业工程—矿山机电]