| 级联H桥变流器电容电压均衡约束条件 |
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| 引用本文： | 刘秋降,吴命利,吴丽然. 级联H桥变流器电容电压均衡约束条件[J]. 电力系统自动化, 2016, 40(15): 113-119 |
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| 作者姓名： | 刘秋降 吴命利 吴丽然 |
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| 作者单位： | 北京交通大学电气工程学院, 北京市 100044,北京交通大学电气工程学院, 北京市 100044,北京交通大学电气工程学院, 北京市 100044 |
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| 基金项目： | 中国铁路总公司科技研究开发计划重点课题资助项目(2015J008-F) |
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| 摘 要： | 通过建立级联H桥变流器数学模型,分析了引起电容电压不均衡原因,建立了调制波微调量叠加法的微分方程与传递函数,求出了均压控制下电容电压稳态解析解。针对多模块下调节器参数整定问题,分析确定了调制波微调量叠加法可靠工作的相角约束和比例系数约束条件。进而指出了变流器在感性、容性工作状态之间切换时电容均压控制稳定工作条件。利用PSCAD/EMTDC软件搭建了三相三级联变流器模型,通过仿真验证了所提出的约束条件的有效性。
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| 关 键 词： | 级联H桥变流器 直流电压均衡 约束条件 多电平变流器 |
| 收稿时间： | 2015-06-13 |
| 修稿时间： | 2016-06-16 |
Constraints for Balancing Capacitor Voltage of Cascaded H-bridge Converters |
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| LIU Qiujiang,WU Mingli and WU Liran. Constraints for Balancing Capacitor Voltage of Cascaded H-bridge Converters[J]. Automation of Electric Power Systems, 2016, 40(15): 113-119 |
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| Authors: | LIU Qiujiang WU Mingli WU Liran |
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| Affiliation: | School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China,School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China and School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | This paper establishes a mathematical model of cascaded H-bridge converters and analyzes the factors which cause capacitor voltage unbalance. Further, the differential equation and transfer function are presented to describe the modulated wave adjustment balancing method. The analytical solution of the capacitor voltage steady value is obtained under balanced voltage control condition. In order to set appropriate controller parameters of many sub-modules, phase and proportion coefficient constraints are studied and calculated. Likewise, when the converter switches between the inductive work mode and capacitive work mode, DC capacitor balanced voltage control must conform to the constraints. A model for a three-phase converter is developed via PSCAD/EMTDC. Simulation results have verified that the phase and proportion coefficient constraints are effective. This work is supported by the Science and Technology Development Plan of China Railway Corporation(No. 2015J008-F). |
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| Keywords: | cascaded H-bridge converter DC voltage balance constraints multilevel converter |
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