基于高交流调制比的混合MMC配比约束方案设计
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1.山东理工大学 电气与电子工程学院,淄博 255000; 2.国网山东省电力公司东营供电公司,东营 257300

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TM743

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山东省自然科学基金项目(ZR2021ME057); 山东省研究生教育质量提升计划项目(SDYKC19103)资助


Design of hybrid MMC proportion constraint scheme based on high AC modulation ratio
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1. School of Electric and Electronic Engineering, Shandong University of Technology, Zibo, Shandong 255000, China; 2. State Grid Dongying Power Supply Company, Dongying 257300, China

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    摘要:

    全桥子模块的负电平输出性能,可使混合型MMC系统交流调制比大于1。基于高交流调制比的混合型MMC配比优化设计,可降低直流故障率,提升交流电网电压等级,扩展交直流电压运行区域,对柔性直流输电发展意义重大。因此,提出直流故障穿越与半桥子模块电容电压平衡约束的高交流调制比混合型MMC全桥比例设计方法;建立±500kV双端混合型MMC系统模型,分析直流故障量暂态特性与半桥子模块电容电压波动规律,得到混合型MMC配比综合优化设计方案。结果表明,全桥占比应不小于41%,随全桥比例增大,系统故障后电压恢复时间先减后增,故障自清除时间缩短,半桥子模块电容电压波动减小8.15kV,电容电压波动与交流调制比呈正相关变化;全桥比例为75%的MMC子模块故障处理能力强,综合性能最优。研究结果为MMC轻型化设计提供参考。

    Abstract:

    Because of the module's negative-level output performance of the full bridge, the hybrid MMC with an AC modulation ratio greater than 1 is satisfied. The optimal design of hybrid MMC ratio based on high AC modulation ratio, which can reduce the DC failure and increase the AC grid voltage level. The operating area of DC voltage is extended. It is of great significance to the development of flexible HVDC transmission. Therefore, a full-bridge proportional constraint considering DC fault ride-through and half-bridge sub-module capacitor-voltage balance based on the high AC modulation ratio was proposed. The transient characteristics of DC faults and the voltage fluctuations of half-bridge sub-module capacitors were analyzed in ±500kV double-ended hybrid MMC system model. The comprehensive optimization design scheme of the mixed MMC ratio was obtained. The results show that the propor-tion of the full bridge should not be less than 41%. The system voltage recovery time is first reduced and then increased after the fault. The fault self-clearing time is shortened, and the half-bridge sub-module capacitor voltage fluctuation is reduced by 8.15kV. The capacitor voltage fluctuation is positively correlated with the AC modulation ratio. The module fault handling capability and overall performance of MMC with a full bridge ratio of 75% is better. The research results provide a reference for the lightweight design of MMC.

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刘雨佳,何柏娜,张秋瑞,张婧茹,贺兴民,董彦辰.基于高交流调制比的混合MMC配比约束方案设计[J].电子测量技术,2022,45(15):6-13

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  • 在线发布日期: 2024-04-08
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