【作者】 王蕾；

【导师】 佟玉鹏；

【作者基本信息】 东北大学 ， 电力电子与电力传动， 2009， 硕士

【摘要】 伊春市友好选矿厂位于小兴安岭友好林区附近,距离供电站55公里,使得10KV高压线路不得不采用长距离输电,远远超出了10KV供电线路的经济半径。为此,给该供电系统带来了许多问题。由于无功功率在电网中长距离传输时会造成网络损耗以及受电端电压下降,因此大量的无功功率在电网中传输必然使电能利用率大大降低且严重影响供电质量。使得选矿厂中大功率电机无法正常启动,选矿厂无法正常投产,造成了很大的经济损失。本文根据存在的这一问题,经过分析提出在电网中的适当位置装设高压无功补偿装置的可行性建议。本文主要研究了无功补偿对电网性能的改善,无功补偿装置的控制方式及原理,和控制器的软硬件设计。系统硬件上采用了市面上性价比最高51系列单片机AT89S52进行控制,具有控制运算速度高,实时性好的特点。在软件上,采用C语言编程,遵循模块化设计原则,提高了系统的通用性和维护的简易程度。在投切原则上,与常见的九区图控制方案相比较,结合现场的实际情况,设计出了电压无功综合控制的模糊推理算法,避免了轻载振荡,反复投切等难题。为了实现装置应具有的功能,本文设计并制作了较为完整的控制电路及其外围设备的硬件电路。它们包括触发电路、数据采集电路、显示电路、看门狗电路及键盘操作电路等。文中还设计编写了整个控制系统的控制程序,给出了控制软件的结构框图。在本文的最后根据系统现场的运行情况,分析了补偿装置功能的实现,提出了该动态无功补偿装置的不足之处和改进提高的方法。更多还原

【Abstract】 Youhao concentrating mill in Fichun is located near forested areas in Lesser Khingan Mountains,55 km distant from the supply station, which causes that 10KV high voltage line cannot help but adopt long-distance transmission beyond economic radius of 10KV power supply line. Therefore many issues are brought to the power supply system.As a result of network loss and receiving end voltage droop which happen during the long distance transmission through power system caused by reactive power, plenty of reactive power transmitting through power system necessarily greatly reduce the PUE and severely influence the quality of supply, which gets the larger power motor of the mill unable to startup and put into operation normally, which brings about tremendous economic loss. On the basis of the issue the article analyzes and puts forward feasibility proposal of installing high voltage SVC at the proper position of power system.The article mainly studies the improvement of power system capability by SVC, SVC control mode and theories, hardware & software design of controller. The system adopts AT89S52, the highest cost performance in the market as hardware to control, which has the characters of high control operation speed and fine real time ability. In software adopting C Programming and following blocking design principle improve system popularity and maintenance simplicity. In switching principles, compared to the common ninearea map control solution, combining the actual situation of the scene reasoning algorithm of Integrated control for reactive voltagein fussy is designed avoiding light load oscillation, repeated switching etc. For the sake of achieving the function that should be owned by the equipment the paper designs and makes rather complete control circuit and hardware circuit of peripheral equipment. They include trigger circuit, display circuit, watchdog timer, keyboard circuit etc. In the paper, the control program of the whole control system is also compiled showing the structured flowchart of the control software. In the end, the paper analyzes the achievement of the SVC function according to the on-the-spot running situation of the system and puts forward the deficiencies of the dynamic SVC and improving methods.更多还原