附加Buck斩波控制的半桥型MMC融冰系统协同控制策略  

Coordinated Control Strategy of Half Bridge MMC Ice Melting System With Additional Buck Chopper Control

作　　者：朱旭东 李红颖 连兴文 徐根堂 成龙 辛业春 ZHU Xudong;LI Hongying;LIAN Xingwen;XU Gentang;CHENG Long;XIN Yechun(Kunming Bureau,EHV Power Transmission Company,CSG,Kunming 650217,China;Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education,Northeast Electric Power University,Jilin Jilin 132012,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司昆明局,昆明650217 [2]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012

出　　处：《南方电网技术》2022年第8期86-93,共8页Southern Power System Technology

摘　　要：将半桥型模块化多电平换流器(modular multilevel converter,MMC)应用于直流融冰系统,具有谐波含量低、体积小、经济性高、可提供无功功率支撑等优势。为了满足不同长度、电阻率的线路融冰需求,提出了一种附加Buck斩波单元的半桥型MMC融冰系统及其协同控制策略,实现直流电压的宽范围连续可调。针对直流侧不同融冰电流需求,提出了MMC桥臂电压主动控制方法,实现其直流出口电压的自适应调整,并综合考虑交流出口电压要求及最大调制比约束,设计了其与直流侧附加Buck斩波电路的协同配合方案,通过控制Buck斩波电路的占空比实现融冰线路电压的宽范围调节,在满足不同线路融冰需求的同时保证交流侧的电能质量。最后在MATLAB/Simulink中搭建仿真模型验证了所提协同控制策略的正确性和有效性。The application of half bridge modular multilevel converter(MMC)in DC deicing system has the advantages of low harmonic content,small volume,high economy and reactive power support.In order to meet the ice melting requirements of lines with different lengths and resistivities,a half bridge MMC ice melting system with Buck chopper unit and its cooperative control strategy are proposed to realize the wide range continuous adjustment of DC voltage.Aiming at the different deicing current requirements of DC side,an active control method of MMC bridge arm voltage is proposed to realize the adaptive adjustment of DC outlet voltage.Considering the requirements of AC outlet voltage and the constraint of maximum modulation ratio,the coordination scheme of MMC bridge arm voltage and DC side additional Buck chopper circuit is designed.The wide range of deicing line voltage is realized by controlling the duty cycle of Buck chopper circuit regulation in order to meet the ice melting needs of different lines at the same time to ensure the power quality of the AC side.Finally,a simulation model is built in MATLAB/Simulink to verify the correctness and effectiveness of the proposed cooperative control strategy.

关 键 词：直流融冰 半桥型MMC Buck斩波电路 最大调制比 协同控制策略 

分 类 号：TM721.1[电气工程—电力系统及自动化]