电力网络扩建并网后静态安全分析方法

发布时间：2018-03-27 06:34

本文选题：静态安全分析　切入点：潮流计算　出处：《吉林大学》2017年硕士论文

【摘要】：电力能源是一个国家工业发展的基础,国民经济发展的命脉,是国计民生的基本保障,电力安全直接关系着国民经济的健康发展和社会的长治久安。近些年来,我国电力系统向大机组、大电网、大容量、远距离输电发展,逐步建设完善特高压电网骨干网架,统筹各个电压等级的坚强网架建设。新建发输变电工程如火如荼地进行着,电力事故也常有发生,本文针对电力网络扩建及并网过程中可能出现影响网络稳定运行的问题,研究了静态安全分析方法。论文主要工作如下:1.研究了电力网络各个元件的结构及数学模型,归纳总结了潮流计算的数学模型、牛顿-拉夫逊潮流计算方法的基本原理和计算步骤。2.研究了电网静态安全分析基本原理及方法,总结概括了电网静态安全分析的工作流程及具体实施办法,主要包括:负荷预测、电力平衡、潮流运行方式选择、静态安全分析等。3.选择某工程实例,对该电力网络新建500k V变电站及并网后静态安全问题进行分析。根据工程实际情况进行了负荷预测、电力平衡分析,选取两种基本潮流运行方式,分别研究了正常运行方式、检修方式和特殊运行方式下的潮流、过载及地区电压分析,针对静态安全分析中出现的问题,给出了具体控制措施。4.针对静态安全分析中出现电压越限中的电压偏低问题,对低压优化控制措施的基本原理进行了推导,提出了一种基于解析灵敏度的低压优化控制措施。利用IEEE-39经典算例以及某地区实际电网实例,对低压优化控制措施的顺序进行了仿真分析,结果表明,首先在网络中无功补偿灵敏度大的负荷节点进行必要的无功功率补偿,如果无功功率补偿后,该低压点电压未能恢复至正常水平,则再逐渐切除该负荷点一定量的负荷。在实际应用中,这样的低压优化措施,电压改善效果更显著,避免了对全局信息的依赖,计算简单,处理速度快,适合在线应用,具有应用价值。
[Abstract]:Power energy is the foundation of a country's industrial development, the lifeblood of national economic development, and the basic guarantee of national economy and people's livelihood. Power security is directly related to the healthy development of the national economy and the long-term stability of the society. In recent years, The power system of our country is developing towards large generating units, large power grids, large capacity and long distance transmission, gradually building and perfecting the backbone network of UHV power grids, and coordinating the construction of strong grid structures of various voltage levels. The new generation, transmission and transformation projects are in full swing. Electric power accidents also often occur. This paper aims at the problems that may affect the stable operation of power network in the process of power network expansion and interconnection. The main work of this paper is as follows: 1. The structure and mathematical model of each component of power network are studied, and the mathematical model of power flow calculation is summarized. The basic principle and calculation steps of Newton-Raphson power flow calculation method. 2. The basic principle and method of power grid static safety analysis are studied, and the work flow and concrete implementation method of power grid static safety analysis are summarized. Mainly include: load forecasting, power balance, power flow operation mode selection, static safety analysis, etc. 3. Select a project example, This paper analyzes the static safety problems of the new 500kV substation and connected to the grid. According to the actual situation of the project, load forecasting, power balance analysis, two basic power flow operation modes are selected, and the normal operation mode is studied respectively. The power flow, overload and area voltage analysis under maintenance mode and special operation mode. Aiming at the problems in static safety analysis, the specific control measures are given. 4. Aiming at the problem of low voltage in voltage overrun in static safety analysis, In this paper, the basic principle of low voltage optimal control is deduced, and a low voltage optimal control method based on analytical sensitivity is put forward. An example of IEEE-39 is used as well as an example of an actual power network in a certain area. The sequence of low voltage optimal control measures is simulated and analyzed. The results show that the reactive power compensation is necessary at the load node with high reactive power compensation sensitivity in the network, and if the reactive power compensation is followed by reactive power compensation, If the voltage of the low-voltage point fails to return to its normal level, then the load of the load point is gradually removed. In practical application, the voltage improvement effect of such low-voltage optimization measures is more remarkable, and the dependence on global information is avoided, and the calculation is simple. The processing speed is fast, suitable for the online application, has the application value.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732

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