| 一种新型的n +1混合式模块化多电平换流器拓扑结构及其控制策略 |
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| 引用本文： | 缪惠宇,梅军,张宸宇,郑建勇,梅飞.一种新型的n +1混合式模块化多电平换流器拓扑结构及其控制策略[J].电力自动化设备,2018,38(3). |
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| 作者姓名： | 缪惠宇 梅军 张宸宇 郑建勇 梅飞 |
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| 作者单位： | 东南大学 电气工程学院，江苏 南京 210096,东南大学 电气工程学院，江苏 南京 210096,国网江苏省电力公司电力科学研究院，江苏 南京 211103,东南大学 电气工程学院，江苏 南京 210096; 江苏省智能电网技术与装备重点实验室，江苏 镇江 212000,江苏省智能电网技术与装备重点实验室，江苏 镇江 212000; 河海大学 能源与电气学院，江苏 南京 211100 |
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| 摘 要： | 针对中压应用场合,提出一种新型的n+1混合式模块化多电平换流器(HMMC)拓扑结构。在传统单桥臂n个子模块的模块化多电平换流器(MMC)基础上,加入1个全桥子模块,使其电容电压控制为半桥子模块的一半,实现输出电压电平数由原先的n+1增长至2n+3。针对其结构提出一种混合式调制方式,在保证HMMC稳定工作的基础上,降低HMMC子模块的工作开关损耗。由于全桥、半桥子模块电容电压不一致,采用一种电容预充电方式,并对子模块电容电压建立数学模型,提出一种子模块电容电压平衡的控制策略。在MATLAB/Simulink软件中搭建仿真模型,仿真结果验证了所提拓扑结构和控制策略的有效性和正确性。
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| 关 键 词： | 混合式模块化多电平换流器 混合调制 子模块电容电压平衡 电容预充电 |
A novel topology of n +1 hybrid modular multilevel converter and its control strategy |
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| MIAO Huiyu,MEI Jun,ZHANG Chenyu,ZHENG Jianyong and MEI Fei.A novel topology of n +1 hybrid modular multilevel converter and its control strategy[J].Electric Power Automation Equipment,2018,38(3). |
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| Authors: | MIAO Huiyu MEI Jun ZHANG Chenyu ZHENG Jianyong and MEI Fei |
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| Affiliation: | School of Electrical Engineering, Southeast University, Nanjing 210096, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China,State Grid Jiangsu Electric Power Research Institute, Nanjing 211103, China,School of Electrical Engineering, Southeast University, Nanjing 210096, China; Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Zhenjiang 212000, China and Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Zhenjiang 212000, China; College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China |
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| Abstract: | A novel topology of n+1 HMMC(Hybrid Modular Multilevel Converter) is proposed for medium voltage application occasions. A full-bridge submodule is added to the traditional modular multilevel converter with n submodules in one arm, so that the capacitor voltage is controlled by half of half-bridge submodule, and the output voltage level increases from n+1 to 2n+3. The proposed strategy employs a hybrid modulation mode which can decrease the losses of HMMC submodule and guarantee steady-state operational condition for HMMC. Due to the difference in capacitor voltage between half-bridge submodule and full-bridge submodule, a capacitor precharge method is adopted and a model of submodule capacitor voltage is built, based on which a control strategy of submodule capacitor voltage balance is further proposed. Simulative results with MATLAB/Simulink validate the effectiveness and correctness of the proposed topology and control strategy. |
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| Keywords: | hybrid modular multilevel converter hybrid modulation submodule capacitor voltage balance capacitor precharge |
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