【作者】 张黎；

【导师】 郭瑞鹏； 陶涛；

【作者基本信息】 浙江大学 ， 电气工程， 2010， 硕士

【摘要】 随着我国电网的飞速发展,电力系统的经济运行一直是电力部门所关注的问题,而无功优化是其中一项重要措施,它是降低电网损耗和提高电网运行电压水平的最有效手段。无功优化就是在城市电网规划的基础上,确定无功补偿设备的补偿位置和容量,以最经济的投资保证系统维持合理的电压水平,同时降低系统的网损,实现系统的安全经济运行。随着浙江电网的发展和调度自动化水平的提高,浙江省电网公司要求建立一套AVC省地协调系统。本文主要根据省地协调系统要求及杭州电网目前AVC系统的实际应用情况,对相关系统进行升级改造。强化地调DF8002AVC系统的优化计算功能、开发地调AVC系统与省调/县区AVC系统协调控制功能、将地调AVC系统中原有的操作中心功能和遥控遥调出口转移到市区AVC系统上、开发县区调AVC系统的协调控制功能,从而完成省地县三级AVC协调控制功能。本方案考虑省地县三级协调控制项目中地调AVC系统功能的实现、县区调AVC系统功能的实现、市区AVC系统功能实现。电力系统的无功优化问题属于OPF的一个组成部分,是一个动态、多目标、多约束、不确定性的非线形混合规划问题,涉及到无功补偿地点的选择、无功补偿容量的确定、变压器分接头的调节和发电机机端电压等配合等方面。本文主要研究了电网无功优化,即在以网损最小为目标函数的情况下,得到无功的最优潮流,在电厂侧是最优无功出力,在变电所侧是无功最优负荷。无功优化的结果确定了各个站点的优化电压,按此电压运行,无功也就是优化状态。无功优化的目标函数是线损最小,要使线损最小,必须使线路电流尽可能小,就应当避免无功在线路中的流动。在理想情况下,线路中没有无功流动,就意味着各个站点无功实现了就地平衡。因此把实现无功就地平衡作为AVC运行的基本原则,实际上也就体现了无功优化的要求。更多还原

【Abstract】 With the rapid development of our country’s electric power grid, electrical running of the electric power is always the concerning question of the electric company. The reactive power optimization is one of the important measure, which could reduce the power loss and improve the voltage quality effectively.With the development of Zhejiang Province’s electric Power and the improvement of the dispatching automation, a coordinated system of AVC is promoted by Zhejiang Power Grid Corporation. This paper mainly introduce the AVC system upgrade according to the provincial requirements and the current system. To strengthen the reactive power optimization function of regional network, to research the multi-level cooperation function, to transfer the operation center function and remote control function to urban monitoring center, and to research the county AVC system’s coordinate control function, what is this paper mainly introduces.The power system reactive power optimization problem belongs to the problems of OPF, which is a dynamic, multi-objective, multi-constraint, uncertainty, non-linear mixed programming problem, and the problem is involving the choice of location of reactive power compensation, reactive power compensation capacity determination, the regulation of transformer tap and generator terminal voltage and so on.This paper mainly studies the reactive power optimization reactive power in order to net loss minimization. That is the optimal reactive power output in the power plant and the optimal reactive power load in the substation, and to minimize line losses, the need to line current as small as possible.It should be avoided in the line reactive power flow under ideal circumstances.It means that each site achieved a local balance of reactive power. Therefore, to achieve the balance of reactive power locally is the basic principle of AVC to run.更多还原