SVC在抚顺西部地区电网的应用研究

发布时间：2018-08-24 08:20

【摘要】：电力系统及电力企业管理运行的基本目标是安全、优质、经济的向用户提供电能,电压是衡量电能质量的重要指标之一。若电压偏低,系统元件的能量损耗和功率损耗增大,还可能对系统的稳定性造成威胁,甚至导致电压崩溃；若电压偏高,电器设备的绝缘功能会遭到破坏,危及设备安全。静止无功补偿装置(SVC),可以对系统无功功率进行快速补偿,以保持电压的平稳性,降低网损,是提高电力系统经济运行的一项十分有效的措施。通过对系统无功功率进行补偿,从而保持电压平衡,这也是在当今电力系统中广泛应用的.本文通过对抚顺西部地区电网的电压情况、负荷特性及无功功率现状进行调查分析,得出了抚顺西部地区电网以电冶炼、电解等冲击性负荷为主的特点,分析了其网内无功补偿容量不足、调压方式单一、电压合格率偏低等问题。提出了在李石寨变安装一种新型的66kV直挂式静止无功补偿装置(SVC)的解决方案,并从接线方式、晶闸管阀触发方式、控制系统电源三方面详细分析该套SVC与传统SVC的区别。证明了该套新型SVC较传统SVC应用于李石寨变具有运行更稳定、响应速度更快、系统故障率低的优点。最后,设计了基于SVC装置的李石寨变电压控制解决方案和投运试验,通过分析李石寨变的无功缺额,确定了SVC的容量,通过投运试验,校核SVC装置接线是否正确,并测试了在高压状态下SVC各机械组件运行状态及系统故障时SVC对母线电压的支持作用。除此之外,本文还比较了SVC运行前后,抚顺地区西部电网电压和网损变化情况。
[Abstract]:The basic goal of management and operation of power system and power enterprise is to provide electricity to users safely, high-quality and economically. Voltage is one of the important indexes to measure power quality. If the voltage is on the low side, the energy loss and power loss of the system components will increase, which may threaten the stability of the system and even lead to the voltage collapse. If the voltage is too high, the insulation function of the electrical equipment will be destroyed and the safety of the equipment will be endangered. The static Var compensation device (SVC),) can compensate the reactive power of the power system quickly to keep the voltage stable and reduce the network loss. It is a very effective measure to improve the economic operation of the power system. It is widely used in power system nowadays by compensating reactive power to maintain voltage balance. Based on the investigation and analysis of the voltage, load characteristics and reactive power status of the western Fushun power network, the paper draws the conclusion that the main characteristics of the western Fushun power network are electric smelting, electrolysis and other impact loads. The problems such as insufficient reactive power compensation capacity, single voltage regulation mode and low qualified voltage rate are analyzed. This paper presents a solution to install a new type of 66kV direct-mounted static Var compensation device (SVC) in Li Shizhai, and analyzes in detail the difference between the SVC and traditional SVC from three aspects: connection mode, thyristor valve trigger mode and control system power supply. It is proved that the new SVC has the advantages of more stable operation, faster response speed and lower failure rate than that of the traditional SVC. At last, the solution and operation test of Li Shizhai variable voltage control based on SVC device are designed. By analyzing the reactive power vacancy of Li Shizhai transformer, the capacity of SVC is determined, and the connection of SVC device is checked by operation test. At the same time, the supporting effect of SVC on bus voltage under high voltage state of SVC mechanical components and system fault is tested. In addition, the variation of voltage and network loss in western power grid of Fushun area before and after SVC operation are compared.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761.12

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