500kV变电站过电压仿真及保护方案研究

发布时间：2018-05-04 21:02

本文选题：雷电过电压 + 操作过电压　；参考：《华北电力大学》2017年硕士论文

【摘要】：作为电力系统的枢纽,变电站在整个电力系统的高效安全运行中发挥重要作用。当变电站中的设备遭到损失将直接影响电力系统的安全可靠运行,造成重要的经济损失。据各国实际的运行经验看,雷电过电压和操作过电压是引起变电站内过电站事故的主要原因。据统计每年约有40%-70%的电力系统故障是由雷击引起的。同时随着电压等级的提升,操作过电压的幅值也在不断攀升,对电力系统的影响也越来越大,目前操作过电压也成为决定电力系统绝缘水平的重要依据。本文以华能魏家峁煤电联营发电厂500kV变电站为研究对象,使用ATP-EMTP仿真软件对变电站内主要设备进行模型,包括雷电流模型、输电线路模型、杆塔模型、避雷器模型等。在雷电波入侵变电站计算方面,主要研究不同运行方式下变电站内主要设备的过电压情况,分析影响过电压的因素,进而提出降低过电压水平的措施。在操作过电压方面,计算了变电站内开断输电线路、开断空载变压器以及隔离开关操作过电压。研究影响操作过电压的因素,并提出降低操作过电压水平的相关措施。最后,根据仿真计算结果,确定500kV变电站内的绝缘配合,优化绝缘配置,对魏家峁电厂500kV变电站的防过电压措施进行指导,提出改进意见。
[Abstract]:As the hub of power system, substation plays an important role in the efficient and safe operation of the whole power system. When equipment loss in substation will directly affect the safe and reliable operation of power system, causing important economic losses. According to the practical operation experience of many countries, lightning overvoltage and operating overvoltage are the main causes of accidents in substation. According to statistics, about 40-70% of power system faults are caused by lightning strike every year. At the same time, with the increase of the voltage level, the amplitude of the operating overvoltage is rising, and the influence on the power system is becoming more and more great. At present, the operating overvoltage has become an important basis for determining the insulation level of the power system. This paper takes the 500kV substation of Huaneng Weijiaomao coal power plant as the research object, and uses the ATP-EMTP simulation software to model the main equipments in the substation, including lightning current model, transmission line model, pole tower model, lightning arrester model and so on. In the calculation of lightning wave intrusion substation, the overvoltage situation of the main equipment in the substation under different operation modes is studied, the factors affecting the overvoltage are analyzed, and the measures to reduce the overvoltage level are put forward. In the aspect of operating overvoltage, the switching off transmission line, the no-load transformer and the switching off overvoltage in the substation are calculated. This paper studies the factors affecting overvoltage and puts forward some measures to reduce the level of overvoltage. Finally, according to the results of simulation calculation, the insulation coordination in 500kV substation is determined, the insulation configuration is optimized, the measures to prevent overvoltage in 500kV substation of Weijiaomao Power Plant are directed, and the improvement suggestions are put forward.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63;TM863

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