Abstract
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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