考虑子模块均压约束的混合型模块化多电平换流器功率极限分析  

Analysis of maximum power operating region for hybrid MMC considering sub-module balancing constraint

作　　者：廖敏 许韦华 杨杰 李鹏飞 季明晶 鲁晓军 向往[2] 文劲宇[2] LIAO Min;XU Weihua;YANG Jie;LI Pengfei;JI Mingjing;LU Xiaojun;XIANG Wang;WEN Jinyu(Global Energy Interconnection Research Institute,Beijing 102209,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology (School of Electrical and Electronic Engineering,Huazhong University of Science and Technology),Wuhan 430074,China)

机构地区：[1]全球能源互联网研究院有限公司,北京102209 [2]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),湖北武汉430074

出　　处：《电力系统保护与控制》2019年第5期17-25,共9页Power System Protection and Control

基　　金：国家自然科学基金智能电网联合基金项目(U1766211);全球能源互联网集团有限公司科技项目~~

摘　　要：混合型模块化多电平换流器具备降压运行和不闭锁穿越直流故障的能力,子模块均压约束是其降压运行时对稳态功率运行范围起主要限制的运行约束。从满足子模块均压约束的换流器桥臂电流和桥臂电压的特性出发,分析了混合型模块化多电平换流器在降压运行时的功率极限运行范围。提出了快速确定混合型模块化多电平换流器可行功率运行域的计算方法。通过对比解析扫描计算的结果和电磁暂态仿真共同验证了计算方法的准确性和有效性。分析了全桥子模块比例对功率运行极限范围的影响。从功率运行能力的角度提出了全桥子模块最小比例的设计方法。Hybrid Modular Multilevel Converter(MMC)has the ability to operate under reduced DC voltage and ride through DC faults without blocking IGBTs.Sub-module balancing constraint places the dominant limit on the feasible power transferring region compared to other constraints when it operates under reduced voltage.This paper analyzes the characteristics of the arm current and arm output voltage that meet sub-module balancing constraint,and calculates the corresponding maximum power operating region when hybrid modular multilevel converter operates under reduced voltage.A fast calculation method is proposed to determine the feasible operating region.The effectiveness and accuracy of the proposed method is validated by comparing calculation results with a scanning method and cross-verified by electromagnetic simulation.The impact of the full-bridge sub-module ration on the operating region is analyzed.A new design model regarding full-bridge sub-module minimum ratio is provided from the perspective of power transferring ability.

关 键 词：混合型模块化多电平换流器 模块化多电平换流器 柔性直流输电 功率运行域 子模块均压 

分 类 号：TM721.1[电气工程—电力系统及自动化]