雷电对变电站内智能组件影响规律与计算方法研究

发布时间：2018-10-31 21:04

【摘要】：智能电网是当今世界电力系统发展变革的最新动向,被认为是21世纪电力系统的重大科技创新和发展趋势。随着大批智能变电站试点工程投入建设,智能组件的需求急剧增加,其应用前景十分广阔。智能组件的安全运行对于智能电网至关重要,而智能组件的推广和使用面临变电站复杂电磁环境的挑战。雷电放电会对周围空间,包括控制室内造成传导或幅射的电磁干扰。本文主要内容为雷击对变电站的智能组件影响的计算方法以及影响规律的研究。变电站会受到直击雷、感应雷、侵入波的影响。智能变电站里的智能组件通过光缆连接传输信号,弱电系统通过电缆和现场连接,会受到直击雷的影响。若为低幅值雷电直击站内的金属架构,会在地网形成干扰电压,并在空间形成辐射场影响智能组件。通过研究直击雷和侵入波两种形式对智能变电站内智能组件影响的建模和计算方法与影响规律,最终提出降低智能组件端口处的浪涌电压为目标开展工作。本文的研究成果为通过计算雷电对智能组件的影响,总结研究不同避雷针位置、避雷器位置、电缆长短和走向对智能组件端口电压的影响规律,获得不同因素对智能组件端口浪涌干扰电压的影响规律。结合现有标准给出了智能组件的抗扰度限值,依据实例中的雷电概率设定智能变电站的耐雷水平,使智能组件端口特性不超标。并提出了智能设备雷害风险评估方法。
[Abstract]:Smart grid is the latest trend of power system development and transformation in the world. It is regarded as a major scientific and technological innovation and development trend of power system in the 21st century. With a large number of intelligent substation pilot projects put into construction, the demand for intelligent components increases rapidly, and its application prospect is very broad. The safe operation of smart components is very important for smart grid, and the promotion and use of intelligent components face the challenge of complex electromagnetic environment of substation. Laser discharge can cause conduction or radiation electromagnetic interference in the surrounding space, including the control room. The main content of this paper is the research on the calculation method and the influence law of the lightning strike on the intelligent component of substation. Substations will be affected by direct lightning, inductive lightning, and invading waves. Intelligent components in intelligent substations transmit signals through optical cables, and weak power systems are connected by direct lightning strikes through cables and field connections. If it is a metal structure in a low-amplitude lightning direct strike station, interference voltage will be formed in the ground grid and the radiation field will affect the intelligent module in space. By studying the modeling and calculating methods and the law of influence of direct strike lightning and intrusion wave on intelligent components in intelligent substations, it is proposed to reduce the surge voltage at the ports of intelligent components for the purpose of carrying out the work. The research results of this paper are as follows: through calculating the influence of lightning on intelligent assembly, the influence of different lightning rod position, arrester position, cable length and direction on the port voltage of intelligent assembly is summarized and studied. The influence of different factors on the surge interference voltage of intelligent module port is obtained. Based on the existing standards, the immunity limit of intelligent components is given, and the lightning resistance level of intelligent substations is set according to the lightning probability in an example, so that the port characteristics of intelligent components do not exceed the standard. A method of lightning hazard risk assessment for intelligent equipment is put forward.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM63

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