RESEARCH ON IMPROVED SCHEME OF DISTRIBUTION NETWORK CURRENT PROTECTION APPLICABLE TO INVERTER-INTERFACED DISTRIBUTED GENERATOR ACCESS

Liu Junyi; Liu Meiyuan; Ning Zhiheng; Dai Zhihui

doi:10.19912/j.0254-0096.tynxb.2024-1860

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 367-375. DOI: 10.19912/j.0254-0096.tynxb.2024-1860

RESEARCH ON IMPROVED SCHEME OF DISTRIBUTION NETWORK CURRENT PROTECTION APPLICABLE TO INVERTER-INTERFACED DISTRIBUTED GENERATOR ACCESS

Dai Zhihui, Liu Junyi, Liu Meiyuan, Ning Zhiheng

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Abstract

The distribution network structure, operation characteristics and fault characteristics have been changed by the access of distributed generation. Because the traditional current protection scheme of distribution network does not take into account the synergistic response and output fluctuation characteristics of distributed generator, this leads to a decrease in the sensitivity of the protection and may cause the protection to lose selectivity. To address this problem, an improved current protection scheme for distribution networks with inverter-interfaced distributed generators （IIDGs） is proposed, based on the IIDG output fluctuation. The scheme can iteratively calculate the short circuit current under normal operation, adjust the setting values of phases Ⅱ and Ⅲ of upstream line current protection and phase I of the downstream line current protection in real time, and solve the IIDG output range applicable to the setting, to ensure that the downstream line operates correctly when the new energy output fluctuates. Finally, it has been confirmed that the proposed scheme significantly enhances the sensitivity of phases Ⅱ and Ⅲ of upstream protection of the IIDG access points by Matlab programming and PSCAD/EMTDC simulations. Additionally, it ensures the selectivity of phase I of downstream protection, thereby improving the effectiveness of stepped current protection.

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fault current / iterative methods / energy storage / improved current protection scheme / output fluctuation

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Dai Zhihui, Liu Junyi, Liu Meiyuan, Ning Zhiheng. RESEARCH ON IMPROVED SCHEME OF DISTRIBUTION NETWORK CURRENT PROTECTION APPLICABLE TO INVERTER-INTERFACED DISTRIBUTED GENERATOR ACCESS[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 367-375 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1860

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