特高压输电系统可控高抗研究

发布时间：2018-11-25 14:44

【摘要】：特高压电网的发展需要实现许多重大技术的突破,很多问题的根源在于特高压电网交流输电线路单位长度充电功率为5001(v超高压交流输电线路的4-5倍。长距离特高压输电线路需要安装高补偿度电抗器来限制工频过电压和操作过电压。当输电系统重载运行时,高补偿并联电抗器带来了较大无功负担对特高压线路的输电能力影响较大,电网运行经济负担加重,在特高压电网中安装可控高抗可以在一定程度上解决上述输电问题。可控高抗作为特高压输电线路上的重要设备,具有降低线路有功损耗,补偿线路电容效应,抑制操作过电压和谐振过电压、减少线路潜供电流,降低恢复电压,提高线路重合闸成功率的作用。与传统的固定高抗相比,可控高抗能够根据线路的传输功率的大小调节自身容量输出无功,对电网由于故障等原因造成的波动快速反应,能够均衡特高压电网系统的无功功率,提高电网的输电能力和可靠性,同时降低电网运行的经济负担。本文介绍了可控高抗的研究现状,对分级式可控并联的结构、原理等进行研究,结合特高压电网输电系统特性详细分析说明了可控高抗的工作方式,并给出了可控高抗相应的无功容量计算公式,总结分级式可控高抗响应速度快、精度高、可靠性高等特点,指出分级式可控高抗将是特高压输电线路无功补偿的主要选择之一。结合华东电网网架结构,在PSCAD软件中搭建华东特高压电网的模型进行分析,验证分级式可控高抗的工作原理及工作过程,分析可控高抗在抑制工频过电压和潜供电流的效果,在此基础上结合华东网架数据分析并选择合适的补偿方式和控制策略。
[Abstract]:The development of UHV power network needs to achieve many important technical breakthroughs, many problems are rooted in the UHV AC transmission line unit length charge power of 5001 (V EHV AC transmission line 4-5 times of the line). Long distance UHV transmission lines need to install high compensation reactor to limit power frequency overvoltage and operating overvoltage. When the transmission system operates under heavy load, the high compensation shunt reactor brings a large reactive power burden to the transmission capacity of UHV transmission lines, and the economic burden of the power network operation is increased. Installing controllable high reactance in UHV power grid can solve the above problems to some extent. As an important equipment in UHV transmission lines, controllable high reactance (THR) can reduce active power loss, compensate line capacitance effect, suppress overvoltage and resonant overvoltage, reduce potential supply current and restore voltage. The effect of improving the success rate of line reclosing. Compared with the traditional fixed high reactance, the controllable high reactance can adjust its own capacity output reactive power according to the transmission power of the transmission line, react quickly to the fluctuation of the power network caused by the fault and so on, and can balance the reactive power of the UHV power network system. Improve the transmission capacity and reliability of the grid, while reducing the economic burden of the grid operation. In this paper, the research status of controllable high reactance is introduced, the structure and principle of hierarchical controllable parallel connection are studied, and the working mode of controllable high reactance is explained by analyzing the characteristics of UHV power transmission system in detail. The formula for calculating reactive power capacity of controllable high reactance is given. The characteristics of high response speed, high precision and high reliability are summarized. It is pointed out that graded controllable high reactance will be one of the main choices of reactive power compensation for UHV transmission lines. Combined with the grid structure of East China Power Grid, the model of East China UHV power network is built in PSCAD software to verify the working principle and working process of hierarchical controllable high reactance, and to analyze the effect of controllable high reactance in suppressing power frequency overvoltage and potential supply current. On the basis of this, the data of East China Grid is analyzed and the appropriate compensation method and control strategy are selected.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761

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