潮流计算方法的实用化改进
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摘要
调度员潮流模块在能量管理系统分析软件中处于核心地位,它不仅是分析软件的必备功能,而且是一些其他功能的基础。本文以工程实践为出发点,以提高计算速度、提高计算精度、改善收敛性为目标,对在线潮流计算提出了三点实用化改进:(1)考虑到潮流计算速度的要求,提出了一种考虑节点类型因素的节点优化方法。(2)针对实际系统中并列母线存在电压差的问题,为了提高计算精度,提出在潮流计算中使用小阻抗支路代替零支路作为母联开关刀闸组的模型,并给出其阻抗值的计算方法。(3)针对含小阻抗支路电网,提出使用双精度类型变量,采用两次高斯赛德尔法选取初值后再使用牛顿拉夫逊法的方法,解决了含小阻抗支路电网潮流计算的收敛性问题。最后,将本文提出的三点改进应用于定西电网实际算例,结果表明,其简单易行,可靠有效,对于解决实际工程中出现的问题具有很好的借鉴性。
The on-line load flow calculation is in the core position in the energy management system analysis software.It is not the basic function of the analysis software but also the basis of other funtions.Based on the engineering practice,in order to improve the calculation speed and precision,three practical improvements are advanced in the field of on-line load flow calculation in the paper:(1)In order to improve the speed of load flow calculation,we propose a modified method which is using different methods to deal with different type of nodes.(2)In the practical system,there is voltage difference in the coordinate bus.In order to improve the calculation precision,a model which is using small impedance branch instead of zero impedance branch as breaker which connects two buses is advanced and the impedance calculation method is also presented.(3)It is found that using Gauss-Seidel method twice and then using Newton-Raphson method can solve the convergence problem in the process of the load flow method being applied to dealing with the case of the small impedance branches.After apllied the improvements to DingXi District grid,it is proved that the method is easy and of great credibility and validity.It can be used for reference in the practical projects.
The on-line load flow calculation is in the core position in the energy management system analysis software.It is not the basic function of the analysis software but also the basis of other funtions.Based on the engineering practice,in order to improve the calculation speed and precision,three practical improvements are advanced in the field of on-line load flow calculation in the paper:(1)In order to improve the speed of load flow calculation,we propose a modified method which is using different methods to deal with different type of nodes.(2)In the practical system,there is voltage difference in the coordinate bus.In order to improve the calculation precision,a model which is using small impedance branch instead of zero impedance branch as breaker which connects two buses is advanced and the impedance calculation method is also presented.(3)It is found that using Gauss-Seidel method twice and then using Newton-Raphson method can solve the convergence problem in the process of the load flow method being applied to dealing with the case of the small impedance branches.After apllied the improvements to DingXi District grid,it is proved that the method is easy and of great credibility and validity.It can be used for reference in the practical projects.
引文
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[10]董良英,房大中,林旭军.含统一潮流控制器的电力系统新型潮流算法.电力系统及其自动化学报,2001,13(2):8-10.
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[14]童强,彭建春.一种新的含UPFC的电力系统潮流算法.继电器,2006,34(2):20-23.
[15]顾伟,黄河,蒋平.用于三相电力系统潮流计算的UPFC稳态模型.高电压技术,2005,31(3):71-73.
[16]张扬,毛雪雁,徐政.用于电网稳态和暂态分析的统一潮流控制器模型.电网技术,2002,26(7):30-33.
[17]基于DF8002系统的高级应用软件(PAS)使用手册.烟台东方电子信息产业股份有限公司,2003.
[18]王小林,陈颜涛.地调系统中零阻抗支路的处理方法.研究与分析,2006,35(2):45-47.
[19]刘强民,朱锦峰,吕国勇,张少军.随州EMS系统中对零阻抗支路的改进处理方法.华中电力,2009,1:21-24.
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