MMC-HVDC直流单极接地故障分析与换流站故障恢复策略

发布时间：2018-05-13 06:01

本文选题：MMC-HVDC + 单极接地故障　；参考：《中国电机工程学报》2014年21期

【摘要】：直流母线单极接地故障是模块化多电平换流器高压直流输电(modular multilevel converter based HVDC,MMC-HVDC)的典型故障,分析其故障特性对于故障的诊断、保护的设计及相关参数的优化具有工程意义,另外,故障清除后的恢复也是需研究的重点问题。针对典型交流接地方式,建立了避雷器不动作时直流单极接地故障暂态分析模型,分析了接地装置参数对故障特性的影响,同时定性分析了避雷器动作对故障特性的影响。针对换流站的故障恢复问题,深入分析了上、下桥臂电容电压的再平衡机制,分析表明其再平衡速度取决于桥臂电阻、调制度等参数,并基于理论分析,设计了一种附加控制器以加速电容电压再平衡,降低其对系统和控制参数的依赖。最后基于PSCAD/EMTDC搭建双端MMC-HVDC仿真模型,验证了故障特性分析和故障恢复策略的正确性和有效性。
[Abstract]:DC bus monopole grounding fault is a typical fault of modularized multilevel converter HVDC / HVDC / HVDC. It is of engineering significance to analyze its fault characteristics for fault diagnosis, protection design and optimization of related parameters. Recovery after fault clearing is also a key issue to be studied. The transient analysis model of DC monopole grounding fault is established for typical AC grounding mode. The influence of grounding device parameters on fault characteristics and the effect of lightning arrester action on fault characteristics are analyzed qualitatively. Aiming at the problem of fault recovery of converter station, the rebalancing mechanism of capacitor voltage of upper and lower arms is deeply analyzed. The analysis shows that the rebalance speed depends on the parameters of bridge arm resistance, regulation and so on, and based on theoretical analysis, An additional controller is designed to accelerate capacitor voltage rebalancing and reduce its dependence on system and control parameters. Finally, a two-terminal MMC-HVDC simulation model based on PSCAD/EMTDC is built to verify the correctness and effectiveness of fault characteristic analysis and fault recovery strategy.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);南方电网科学研究院;
【基金】：国家863高技术基金项目(2013AA050105) 中央高校基本科研业务费专项资金资助(2014XS03)~~
【分类号】：TM721.1

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