| 引用本文: | 贾科,汪执雅,戴明,毕天姝,李晨曦,张弛.分布式光伏接入对110 kV主变中性点电压的影响分析[J].电力自动化设备,2018,(11): |
| JIA Ke,WANG Zhiya,DAI Ming,BI Tianshu,LI Chenxi,ZHANG Chi.Influence of distributed PV integration on neutral point voltage of 110 kV main transformer[J].Electric Power Automation Equipment,2018,(11): |
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| 摘要: |
| 110 kV主变在非直接接地运行方式下，当变压器低压侧存在分布式光伏接入时，发生单相接地短路故障等情况可能会引起变压器中性点过电压问题，对中性点的绝缘造成威胁。分析了发生故障后网络的故障特性、线路保护的动作情况以及中性点电压偏移问题；在此基础上，分析了线路保护动作后分布式光伏接入对中性点电压偏移问题可能造成的恶化，并讨论了光伏容量和本地负荷的影响；给出了含分布式光伏配电网110 kV主变加装间隙保护的相关建议。 |
| 关键词: 分布式电源 光伏发电 中性点电压 间隙保护 有源配电网 接地故障 过电压 |
| DOI：10.16081/j.issn.1006-6047.2018.11.027 |
| 分类号:TM615;TM761 |
| 基金项目:国家重点研发计划基金资助项目(2018YFB0904104)；国家自然科学基金资助项目(51725702,51407067) |
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| Influence of distributed PV integration on neutral point voltage of 110 kV main transformer |
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JIA Ke1, WANG Zhiya1, DAI Ming1, BI Tianshu1, LI Chenxi1, ZHANG Chi2
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1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China
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| Abstract: |
| When the 110 kV main transformer with distributed PV(PhotoVoltaic) integration at the low voltage side operates in the non-direct-grounding mode, the single-phase grounding fault may cause the problem of neutral point overvoltage for the transformer, which threatens the insulation of the neutral point. The fault characteristics of network, the action of line protection and the voltage deviation of neutral point after faults are analyzed, based on which, the possible deterioration of the neutral point voltage deviation caused by the integration of distributed PV after line protection action is analyzed, the influences of PV capacity and local load are discussed, and then the relevant suggestion of installing gap protection for the 110 kV main transformer in the distribution network integrated with distributed PV is given. |
| Key words: distributed power generation photovoltaic generation neutral point voltage gap protection active distribution network grounding fault overvoltage |
