Optimized control strategy based on dynamic redundancy for modular multilevel converter

被引：0
作者：
Liu, Gaoren [1 ]
Xu, Zheng [1 ]
Xue, Yinglin [2 ]
Tang, Geng [1 ]
机构：
[1] College of Electrical Engineering, Zhejiang University, Hangzhou
[2] State Power Economic Research Institute, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2014年 / 40卷 / 08期
关键词：
Ac redundancy; Dc redundancy; Dynamic redundancy; Modular multilevel converter; Redundancy protection; Utilization ratio of sub-modules;
D O I：
10.13336/j.1003-6520.hve.2014.08.042
中图分类号：
学科分类号：
摘要：
In order to improve the utilization ratio of sub-modules and reduce the capacitor voltage stress on the sub-modules for modular multilevel converter, we proposed a control strategy of modular with redundant sub-modules based on dynamic redundancy. Considering the synthetical effects of the AC and DC system, we proposed two indexes, namely, the dynamic redundancy and the utilization ratio of the sub-modules. In this strategy, under the given working conditions, the reference value of the capacitor voltage is derived according to the maximum output voltage of each converter arm and the adjustable safety margin. This method can improve the flexibility of the converter, and enhance the fault ride-through capability of the system. Moreover, we built a model of two-terminal MMC-HVDC system in PSCAD/EMTDC, and analyzed several operation modes of the system. Simulation results show that, by using the proposed strategy, the redundancy of the converter is adjustable dynamically and the redundancy protection under fault conditions is valid without obvious fluctuation of any index. Hence, the proposed strategy is valid and feasible.
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收藏
页码：2564 / 2571
页数：7
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