| 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,(3): |
| MIAO Huiyu,MEI Jun,ZHANG Chenyu,ZHENG Jianyong,MEI Fei.A novel topology of n +1 hybrid modular multilevel converter and its control strategy[J].Electric Power Automation Equipment,2018,(3): |
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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。 |
| 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 |
| DOI：10.16081/j.issn.1006-6047.2018.03.012 |
| 分类号:TM46 |
| 基金项目: |
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| A novel topology of n +1 hybrid modular multilevel converter and its control strategy |
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MIAO Huiyu1, MEI Jun1, ZHANG Chenyu2, ZHENG Jianyong1,3, MEI Fei3,4
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1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.State Grid Jiangsu Electric Power Research Institute, Nanjing 211103, China;3.Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Zhenjiang 212000, China;4.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. |
| Key words: hybrid modular multilevel converter hybrid modulation submodule capacitor voltage balance capacitor precharge |
