| 引用本文: | 戴志辉,刘雪燕,刘自强,陈思琦,李毅然,秦良栋.基于限流电抗电压积分值的环状柔性直流配电网保护方案[J].电力自动化设备,2020,40(12): |
| DAI Zhihui,LIU Xueyan,LIU Ziqiang,CHEN Siqi,LI Yiran,QIN Liangdong.Protection scheme for ring flexible DC distribution grids based on integration of current-limiting reactance voltage[J].Electric Power Automation Equipment,2020,40(12): |
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| 摘要: |
| 直流故障电流上升速度快，故障影响范围广，传统的交流故障检测方法不再适用。为此，基于系统复频域模型提出一种基于直流线路限流电抗电压积分值的多端直流环网故障快速检测方法。首先，详细分析了多端环状柔性直流配电网中各元件的时域和复频域等效模型。在此基础上，给出了限流电抗电压的计算方法，其实现了系统等效模型在时域和复频域上的转化，求解简单，建模难度低，且对不同系统的建模有普适性。其次，提出一种基于限流电抗电压积分值的故障检测方法，其抗噪能力强且具有一定的耐受过渡电阻能力。最后，在PSCAD/EMTDC中搭建仿真模型，验证了所提计算方法的正确性和保护方案的可行性。 |
| 关键词: 直流配电系统 拉普拉斯变换 复频域等效 限流电抗电压 单端量保护 |
| DOI：10.16081/j.epae.202009031 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金资助项目(51877084)；国家重点研发计划项目(2016YFB0900203)；河北省自然科学基金资助项目(E2018502063) |
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| Protection scheme for ring flexible DC distribution grids based on integration of current-limiting reactance voltage |
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DAI Zhihui1, LIU Xueyan1, LIU Ziqiang1, CHEN Siqi1, LI Yiran1, QIN Liangdong2
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1.Hebei Key Laboratory of Distributed Energy Storage and Microgrid, North China Electric Power University, Baoding 071003, China;2.State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050021, China
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| Abstract: |
| The traditional AC fault detection methods are not applicable for DC fault identification conside-ring the fact that DC fault current rises rapidly and has a wide influencing range. Therefore, a fast fault detection approach based on the integration of current-limiting reactance voltage for the multi-terminal DC ring network is proposed based on the complex frequency domain model of the system. Firstly, the equivalent models of each component of multi-terminal DC ring network in both time domain and complex frequency domain are analyzed in detail. Based on this, the calculation method of current-limiting reactance voltage is elaborated, by which the transformation of the system model between time domain and complex frequency domain is realized. The calculation method has the advantages of simple solution, low modeling difficulty and universality for modeling of different systems. Subsequently, a fault detection method based on the integration of current-limiting reactance voltage is proposed, which has strong anti-noise ability and a certain ability against transition resistance. Finally, the validity of the proposed calculation method and the feasibility of the protection scheme are verified via PSCAD/EMTDC based simulations. |
| Key words: DC distribution grid Laplace transform complex frequency domain equivalence current-limiting reactance voltage single-ended protection |
