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A calculation method for the short-circuit current contribution of current-control inverter-based distributed generation sources at balanced conditions
Electric Power Systems Research ( IF 3.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.epsr.2020.106839
Insu Kim

Abstract When a grid-connected inverter-based distributed generation (IBDG) source behaves as a current source that can limit its magnitude in current loop control, the contribution from the inverter to the short-circuit current (SCC) is not as significant as those from conventional synchronous generators. However, the increased IBDG sources can change the magnitude and phase angle of the SCC, so they should not be ignored in SCC calculation. The objective of this study is to present a method for calculating the SCC of an IBDG source of acting as an internally either limited or unlimited current source at balanced conditions. For this purpose, negative- and zero-sequence networks are transferred to a positive-sequence network with balanced IBDG sources. Subsequently, SCCs and zero-, negative-, and positive-sequence induced voltage are determined by using zero- and negative-sequence current injection matrices. Then, new SCC calculation equations for a single line-to ground, line-to-line ground, line-to-line, or three-phase fault are also derived. As a result, the proposed method improves the conventional method in terms of taking the contribution from a balanced IBDG source to SCC into account.

中文翻译:

一种平衡条件下基于电流控制逆变器的分布式电源短路电流贡献的计算方法

摘要 当并网逆变器分布式发电 (IBDG) 电源在电流环控制中充当可以限制其幅值的电流源时,逆变器对短路电流 (SCC) 的贡献不如那些来自传统的同步发电机。但是,增加的IBDG源会改变SCC的幅度和相位角,因此在SCC计算中不应忽略它们。本研究的目的是提出一种计算 IBDG 源在平衡条件下充当内部有限或无限电流源的 SCC 的方法。为此,负序和零序网络被转移到具有平衡 IBDG 源的正序网络。随后,SCC 和零-、负-、和正序感应电压是通过使用零序和负序电流注入矩阵来确定的。然后,还推导出单线对地、线对线接地、线对线或三相故障的新 SCC 计算方程。因此,所提出的方法在考虑平衡 IBDG 源对 SCC 的贡献方面改进了传统方法。
更新日期:2021-01-01
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