| 含逆变型分布式电源的不平衡配电网短路电流计算方法研究 |
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| 引用本文： | 邓成江,李海锋,曾德辉,肖瑞超,王钢.含逆变型分布式电源的不平衡配电网短路电流计算方法研究[J].陕西电力,2021,0(2):39-46. |
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| 作者姓名： | 邓成江 李海锋 曾德辉 肖瑞超 王钢 |
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| 作者单位： | （华南理工大学，广东 广州 510641） |
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| 摘 要： | 逆变型分布式电源（IBDG）的输出由其控制策略决定而具有很强的非线性，使传统配电网的短路电流计算方法不再适用，而配电网的不对称更是进一步增加了其短路计算的难度。根据对称分量法推导出不平衡配电网的故障点各序电流，提出一种基于序网络迭代修正的不平衡配电网短路电流计算方法，在每一次迭代中，根据当前节点各序电压分别修正IBDG的输出电流和各不对称元件补偿电流源的输出电流，利用节点电压方程得到新的节点各序电压和故障点各序电流，直到满足收敛条件。最后，基于PSCAD/EMTDC对含IBDG不平衡配电网的进行了仿真计算，验证了所提方法的准确性和有效性。
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| 关 键 词： | 逆变型分布式电源 对称分量法 不平衡配电网 短路电流计算方法 |
Calculation Method of Short-circuit Current in Unbalanced Distribution Network with Inverter-based Distributed Generation |
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| DENG Chengjiang,LI Haifeng,ZENG Dehui,XIAO Ruichao,WANG Gang.Calculation Method of Short-circuit Current in Unbalanced Distribution Network with Inverter-based Distributed Generation[J].Shanxi Electric Power,2021,0(2):39-46. |
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| Authors: | DENG Chengjiang LI Haifeng ZENG Dehui XIAO Ruichao WANG Gang |
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| Affiliation: | （South China University of Technology， Guangzhou 510641， China） |
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| Abstract: | The output of inverter-based distributed generator （IBDG） is determined by its control strategy and has a strong nonlinearity， making the calculation method of short-circuit current in traditional distribution network no longer applicable. Moreover， the asymmetry of distribution network further increases the difficulty of its short-circuit current calculation. To this end， the sequence current of fault points in unbalanced distribution network is deduced according to symmetrical component method. On this basis， a short-circuit current calculation method of the unbalanced distribution network is proposed based on the iterative correction of sequence network. In each iteration， the output current for IBDG and the compensation current source of each asymmetric component are respectively corrected according to the sequence voltage of the current node， then nodal voltage equation is used to get the new nodal sequence voltage and sequence current of the fault points， until the convergence condition is satisfied. Finally， based on PSCAD/EMTDC， the simulation calculation of the unbalanced distribution network with IBDGs is carried out， and the accuracy and effectiveness of the proposed method is verified. |
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| Keywords: | symmetrical component method unbalanced distribution network short-circuit current calculation method |
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