同杆多回线复杂故障计算的二相回路法研究
发布时间：2018-08-06 16:24
【摘要】：同杆多回线具有输电走廊窄、占地面积小、节省投资、建设速度快等优点,在我国受到了越来越多的应用。而随着电网规模的不断扩大,单向重合闸等设备的应用,复杂故障发生的概率也越来越高。二相回路法能够解耦线路,使得故障计算更加简单,所以针对同杆多回线复杂故障计算的二相回路法研究具有现实意义。二相回路法目前只被应用于解耦同杆双回线,计算同杆双回线简单故障,所以研究同杆多回线复杂故障计算的二相回路法十分必要。本文首先介绍了二相回路法的原理,对其解耦同杆双回线形成独立回路的过程进行了分析,进而将二相回路法进行改进,得到了改进后的各序二相回路分量和二相回路,将其推广到了同杆多回线中,使它能够解耦同杆多回线路,并且列出了利用改进的二相回路法计算同杆多回线简单故障的步骤。然后本文对两端口网络法的原理进行了介绍,将改进后的二相回路法与两端口网络法结合,得到了二相回路坐标下的两端口网络法,接着进行深入分析,将其推广到了多端口网络法中,列出各故障端口电压方程,得到了二相回路坐标下的多端口网络法。随后列出了利用二相回路法计算同杆多回线复杂故障的步骤,使其能够计算同杆多回线任意重数的复杂故障,这样也就得到了同杆多回线复杂故障计算的二相回路法的原理。最后本文建立了一个同杆三回线输电系统,在PSCAD/EMTDC中搭建模型,对一个具体的同杆三回线双重故障列出了利用改进的二相回路法计算和通过PSCAD/EMTDC仿真分析的过程,并且改变了线路参数,综合比较了三种线路参数下多种同杆三回线双重故障的算例数据,证明了本文同杆多回线复杂故障计算的二相回路法的研究是正确的。
[Abstract]:With the advantages of narrow transmission corridor, small area, low investment and fast construction speed, the same pole multi-circuit line has been applied more and more in our country. With the expansion of power grid and the application of unidirectional reclosure, the probability of complex faults is higher and higher. The two-phase circuit method can decouple the circuit and make the fault calculation simpler, so it is of practical significance to study the two-phase loop method for the complex fault calculation of the same rod multi-circuit line. The two-phase loop method is only used to decouple the double-circuit line of the same rod and calculate the simple fault of the double-circuit line of the same rod, so it is necessary to study the two-phase loop method for the complex fault calculation of the multi-circuit line of the same rod. In this paper, the principle of the two-phase loop method is introduced, and the process of forming an independent loop by decoupling the double-loop of the same rod is analyzed. Then, the two-phase loop method is improved, and the components and the two-phase loop of the improved two-phase loop are obtained. The method is extended to the same pole multicircuit line, which can decouple the same pole multicircuit line, and the steps of calculating the simple fault of the same pole multicircuit line by using the improved two-phase loop method are listed. Then, this paper introduces the principle of two-port network method, combines the improved two-phase loop method with two-port network method, and obtains the two-port network method under the two-phase loop coordinate, then carries on the thorough analysis. It is extended to the multi-port network method, and the voltage equations of each fault port are listed, and the multi-port network method under the two-phase loop coordinates is obtained. Then the steps of calculating the complex faults of the same rod multicircuit line by using the two-phase loop method are listed, so that it can calculate the complex faults with arbitrary multiplicity of the same rod multi-circuit line, and the principle of the two-phase circuit method for the calculation of the complex faults of the same rod multi-circuit line is obtained. Finally, this paper establishes a three-circuit transmission system with the same rod, builds a model in PSCAD/EMTDC, and lists the process of calculating and analyzing by using the improved two-phase loop method and PSCAD/EMTDC simulation analysis for a specific double fault of the same three-circuit line. And the line parameters are changed, and the calculation data of multiple double faults of the same rod three-circuit line under three kinds of line parameters are compared synthetically. It is proved that the two-phase loop method for the complex fault calculation of the same rod multi-circuit line in this paper is correct.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
[Abstract]:With the advantages of narrow transmission corridor, small area, low investment and fast construction speed, the same pole multi-circuit line has been applied more and more in our country. With the expansion of power grid and the application of unidirectional reclosure, the probability of complex faults is higher and higher. The two-phase circuit method can decouple the circuit and make the fault calculation simpler, so it is of practical significance to study the two-phase loop method for the complex fault calculation of the same rod multi-circuit line. The two-phase loop method is only used to decouple the double-circuit line of the same rod and calculate the simple fault of the double-circuit line of the same rod, so it is necessary to study the two-phase loop method for the complex fault calculation of the multi-circuit line of the same rod. In this paper, the principle of the two-phase loop method is introduced, and the process of forming an independent loop by decoupling the double-loop of the same rod is analyzed. Then, the two-phase loop method is improved, and the components and the two-phase loop of the improved two-phase loop are obtained. The method is extended to the same pole multicircuit line, which can decouple the same pole multicircuit line, and the steps of calculating the simple fault of the same pole multicircuit line by using the improved two-phase loop method are listed. Then, this paper introduces the principle of two-port network method, combines the improved two-phase loop method with two-port network method, and obtains the two-port network method under the two-phase loop coordinate, then carries on the thorough analysis. It is extended to the multi-port network method, and the voltage equations of each fault port are listed, and the multi-port network method under the two-phase loop coordinates is obtained. Then the steps of calculating the complex faults of the same rod multicircuit line by using the two-phase loop method are listed, so that it can calculate the complex faults with arbitrary multiplicity of the same rod multi-circuit line, and the principle of the two-phase circuit method for the calculation of the complex faults of the same rod multi-circuit line is obtained. Finally, this paper establishes a three-circuit transmission system with the same rod, builds a model in PSCAD/EMTDC, and lists the process of calculating and analyzing by using the improved two-phase loop method and PSCAD/EMTDC simulation analysis for a specific double fault of the same three-circuit line. And the line parameters are changed, and the calculation data of multiple double faults of the same rod three-circuit line under three kinds of line parameters are compared synthetically. It is proved that the two-phase loop method for the complex fault calculation of the same rod multi-circuit line in this paper is correct.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75
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相关期刊论文 前10条
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