采用质因子分解法与希尔排序算法的MMC电容均压策略

发布时间：2018-07-12 12:37

本文选题：模块化多电平换流器 + 电容电压均衡　；参考：《中国电机工程学报》2015年12期

【摘要】：子模块电容电压均衡控制策略是保证模块化多电平换流器(modular multilevel converter,MMC)正常运行的重要环节。对于每相桥臂含有大规模数量子模块的模块化多电平换流器高压直流输电(modular multilevel converter based high voltage direct current,MMC-HVDC)系统,减小排序复杂度对MMC-HVDC工程控制器设计难度以及硬件需求的降低具有重要意义。该文基于质因子分解法提出一种优化的混合排序法,通过引入希尔排序算法大幅度降低排序次数,从而降低仿真时间,降低了对系统硬件的要求。推导适用于MMC-HVDC系统的希尔排序步长的时间复杂度,给出基于混合排序法的排序次数计算公式,分析分组层数对系统降低频率的影响,得到分组层数与混合排序法优化效率成反比例关系的结论。最后在PSCAD/EMTDC中搭建两端401电平MMC-HVDC模型进行仿真,仿真结果验证了混合排序法及分组层数对优化效率影响的分析的有效性与正确性。
[Abstract]:The capacitor voltage equalization control strategy of submodule is an important step to ensure the normal operation of the modularized multilevel converter (modular multilevel converter. For a modularized multilevel converter (HVDC) system with a large number of sub-modules per arm, it is of great significance to reduce the scheduling complexity for the design of MMC-HVDC engineering controller and the reduction of hardware requirements. This paper presents an optimized hybrid sorting method based on the qualitative factor decomposition method. By introducing the Hill sorting algorithm, the sorting times are greatly reduced, thus the simulation time is reduced and the hardware requirement of the system is reduced. The time complexity of Hill sorting step size for MMC-HVDC system is deduced, and the calculation formula of sorting times based on hybrid sorting method is given. The influence of the number of grouping layers on the frequency reduction of the system is analyzed. The conclusion that the number of grouping layers is inversely proportional to the optimization efficiency of hybrid sorting method is obtained. Finally, a 401 level MMC-HVDC model is built in PSCAD / EMTDC for simulation. The simulation results verify the validity and correctness of the hybrid sorting method and the effect of the number of packet layers on the optimization efficiency.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：国家自然科学基金项目(51177042) 国家863高技术研究发展计划项目(2013AA050105)~~
【分类号】：TM721.1

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