分布式发电对变压器中性点工频过电压特性的影响

2022 12th International Conference on Power and Energy Systems (ICPES) Pub Date : 2022-12-23 DOI:10.1109/ICPES56491.2022.10073131

Changhao He, Rui Qin, Baojun Xu, Yuyin Zhan, Haifeng Li

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引用次数: 0

摘要

分布式发电会给配电网的继电保护和自动化带来各种问题，也可能导致变压器中性点不接地过电压的严重后果。分析了单相接地故障下不接地变压器中性点工频过电压产生的机理。在此基础上，详细研究了110kV线路故障后DG对中性点过电压的影响。考虑到不同控制方式下存在旋转DG和逆变器接口DG (iidg)，测试结果表明，pq控制DG最容易使变压器中性点电压超过额定值，对中性点过电压的绝缘威胁也最大。

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Influence of Distributed Generation on Power Frequency Overvoltage Characteristics of Transformer Neutral Point

Distributed generation (DG) will bring various problems to the relay protection and automation of distribution network, which may also lead to serious consequences of the ungrounded transformer neutral point overvoltage. This paper analyzes the mechanism of power frequency overvoltage at the ungrounded transformer neutral point under single-phase grounding fault. Based on it, this paper studies the influence of DG on neutral point overvoltage after 110kV line fault in detail. Considering that there are rotational DGs and inverter-interfaced DGs (IIDGs) under different control modes, test results show that PQ-controlled DG makes the transformer neutral point voltage exceeds its rated value easiest, and it also has the greatest insulation threat to neutral point overvoltage.

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2022 12th International Conference on Power and Energy Systems (ICPES)

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