| 引用本文: | 郑超,吕思卓,马世英,高凯,张鑫.计及有源设备“质”“量”差异的直流短路比[J].电力自动化设备,2019,39(6): |
| ZHENG Chao,L? Sizhuo,MA Shiying,GAO Kai,ZHANG Xin.DC short circuit ratio considering difference of “quality” and “quantity” for active device[J].Electric Power Automation Equipment,2019,39(6): |
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| 摘要: |
| 提出了一种计及有源设备动态特性差异——无功属性“质”的差异和无功大小“量”的差异的直流短路比新指标MISCRCQQ，并给出了其计算流程。通过大容量感应电动机负荷接入的多直流馈入受端系统仿真结果表明，所提直流短路比的数值大小的变化趋势与电网动态电压支撑能力的变化态势具有一致性，可有效解决多源环境下采用传统短路比评估失效的问题。 |
| 关键词: 短路比 电网强度 动态电压支撑 有源设备 多类型 特性差异 |
| DOI：10.16081/j.issn.1006-6047.2019.06.021 |
| 分类号:TM721.1 |
| 基金项目:国家电网公司科技项目(系统保护动作行为全过程智能分析、控制决策与评价关键技术研究)(XT71-18-022) |
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| DC short circuit ratio considering difference of “quality” and “quantity” for active device |
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ZHENG Chao1, L? Sizhuo1, MA Shiying1, GAO Kai2, ZHANG Xin1
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1.China Electric Power Research Institute, Beijing 100192, China;2.State Grid Liaoning Province Electric Power Company, Shenyang 110006, China
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| Abstract: |
| A new index MISCRCQQ for direct current short circuit ratio is proposed, which considers the difference of dynamic characteristics of active devices, that is, the difference of both “quality” and “quantity” for reactive power. The calculation process of MISCRCQQ is also given. Simulative results on multi-HVDC infeed system with large capacity induction motor access show that the magnitude of MISCRCQQ exhibits a same changing trend as the dynamic voltage support capability of power grid. Therefore, MISCRCQQ can effectively solve the evaluation failure problem of traditional short circuit ratio under multi-source environment. |
| Key words: short circuit ratio power grid strength dynamic voltage support active device diversification charac-teristic difference |
