MMC预充电子模块电容电压均衡特性仿真建模

发布时间：2018-06-01 16:42

本文选题：模块化多电平换流器 + 子模块电容均衡特性　；参考：《电网技术》2017年12期

【摘要】：模块化多电平换流器在预充电阶段会出现子模块电压分布不均的现象,严重时会导致子模块旁路,进而影响系统的正常运行。基于MMC预充电过程子模块电容电压的均衡特性,提出了MMC预充电模型搭建方法。该模型充分考虑实际阀塔各导体结构之间的寄生电容参数,以及子模块取能电源等效电阻参数对子模块电压均衡特性的影响。针对超大规模子模块数量下存在的计算效率低的问题,提出了预充电过程MMC单桥臂等效方法,以及换流阀寄生电容集成降阶方法。结合实际工程参数,通过仿真结果与实测数据的对比,验证了所提模型的正确性和有效性。在此基础上,进一步仿真分析了阀塔寄生电容、取能电源等效电阻、子模块均压电阻等参数对子模块电压均衡特性的影响规律,可为工程设计提供参考依据。
[Abstract]:The voltage distribution of the sub-module will be uneven in the precharge stage of the modularized multilevel converter, which will lead to the submodule bypass seriously, and then affect the normal operation of the system. Based on the capacitance voltage equalization of the sub-module of MMC precharge process, a MMC precharge model is proposed. The model fully considers the parasitic capacitance parameters among the conductor structures of the actual valve tower and the effect of the equivalent resistance parameters of the submodule energy source on the voltage equalization characteristics of the sub-modules. In order to solve the problem of low computational efficiency under the large number of sub-modules, the equivalent method of MMC single arm in precharge process and the method of reducing the order of parasitic capacitance integration of converter valve are proposed. The correctness and validity of the proposed model are verified by comparing the simulation results with the measured data in combination with the actual engineering parameters. On this basis, the influence of parameters such as parasitic capacitance of valve tower, equivalent resistance of energy source and voltage sharing resistance of sub-module on voltage equalization characteristics of sub-module is further simulated and analyzed, which can provide reference for engineering design.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);荣信汇科电气技术有限责任公司;
【基金】：国家重点研发计划项目(2016YFB0900904)~~
【分类号】：TM46;TM721.1

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