| 引用本文: | 谭会征,李永丽,陈晓龙,赵曼勇,刘 年,黄维芳.带低电压穿越特性的逆变型分布式电源对配电网短路电流的影响[J].电力自动化设备,2015,35(8): |
| TAN Huizheng,LI Yongli,CHEN Xiaolong,ZHAO Manyong,LIU Nian,HUANG Weifang.Influence of inverter-interfaced distributed generator with low-voltage ride-through capability on short circuit current of distribution network[J].Electric Power Automation Equipment,2015,35(8): |
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| 摘要: |
| 逆变型分布式电源（IIDG）的大规模接入使得原有的配电网短路电流计算方法不再适用，这就给含IIDG配电网的继电保护整定带来了困难。在对IIDG的低电压穿越特性及控制策略分析的基础上，给出了含单个以及2个IIDG的配电网短路电流计算的通用方法。该方法将IIDG等效为只包含在正序网络中的压控电流源模型，并通过分析发生不同类型故障时含IIDG配电网的等效电路图或复合序网图，建立了短路电流计算方程，进而推导了短路电流计算公式。通过在PSCAD中进行建模仿真，验证了该方法的正确性。最后，根据推导得到的短路电流计算公式，利用MATLAB软件分析了含IIDG配电网短路电流随系统参数以及IIDG容量变化的一般规律。 |
| 关键词: 逆变型分布式电源 配电网 低电压穿越 正序控制 短路电流计算 故障特性分析 |
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| 基金项目:南方电网公司重点科技项目（K-KY2013-116） |
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| Influence of inverter-interfaced distributed generator with low-voltage ride-through capability on short circuit current of distribution network |
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TAN Huizheng1, LI Yongli1, CHEN Xiaolong1, ZHAO Manyong2,3, LIU Nian2, HUANG Weifang2,3
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1.Tianjin University，Tianjin 300072，China;2.Power Dispatching Control Center of China Southern Power Grid，Guangzhou 510623，China;3.Electric Power Research Institute of China Southern Power Grid，Guangzhou 510080，China
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| Abstract: |
| The existing methods of short circuit current calculation for distribution network is no longer applicable due to the large-scale integration of IIDG（Inverter-Interfaced Distributed Generator），which makes the relay protection setting of IIDG-contained distribution network much difficult. The low-voltage ride-through characteristics of IIDG and its control strategy are analyzed，based on which，a universal method of short circuit current calculation is proposed for the distribution network with one or two IIDGs. It makes the IIDG equivalent to a voltage-controlled current-source model contained only in the positive-sequence network，establishes the short circuit current calculation equations by analyzing the equivalent circuit or compound-sequence network of the IIDG-contained distribution network for different types of faults，and deduces the short circuit current calculating formulas. Its correctness is proved by the results of PSCAD simulation. According to the deduced calculating formulas，the general variation rules of short circuit current along with the variation of system parameters and IIDG capacity are analyzed by MATLAB for the IIDG-contained distribution network. |
| Key words: inverter-interfaced distributed generator distribution networks low-voltage ride-through positive control short circuit current calculation fault characteristic analysis |
