基于电压和有功性能指标的电力系统应急分析

Satyanarayana Burada, D. Joshi, K. Mistry
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引用次数: 28

摘要

目前,电力系统的安全保护是运行工程师的一项重要工作,可以通过在线安全评估来完成。当电力系统发生意外事件时,应急分析是预测系统运行状况的最佳方法之一。为了进行偶然性分析,操作员必须通过对系统进行负荷流分析,了解每条母线的电压、功率和电压角等参数。牛顿-拉夫森法在较短的时间内给出准确的结果,是最佳的潮流分析方法。本文在MATLAB环境下对标准的6母线和5母线电力系统的所有线路停电事故进行了仿真。针对每次线路停电事故,对系统进行了潮流分析,并计算了有功功率和电压性能指标。这两个性能指标将提供关于在特定线路中断时通过线路的有功功率流和总线电压的变化的想法。这两个指标的总和将给出性能指标值,通过该指标值将给出线路的严重程度排序。并从负荷流结果上比较了低等级和高等级线路停电事故。这种突发事件分析有助于操作工程师了解哪条线路中断对系统是危险的,以及应该采取什么预先行动来最大限度地减少该特定线路中断的影响。
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Contingency analysis of power system by using voltage and active power performance index
Now a days power system protection is an important task for an operating engineer, which can be done by doing online security assessment. Contingency analysis is one of the best methods to forecast the condition of power system if any unwanted event occured in the power system. To do contingency analysis first the operator has to know the parameters like voltage, power and voltage angle at each and every bus by doing load flow analysis on the system. Newton Raphson method is the best load flow method as it gives accurate results in less time. In this paper all line outage contingencies in a standard 6 bus and 5 bus power system has been done in MATLAB environment. For each line outage contingency, load flow analysis has been done on the system and the active power and voltage performance indices have been calculated. These two performance indices will give the idea about the change in active power flow through the lines and voltages at the buses for a particular line outage. Summation of these two indices will give the performance index value through which ranking of severity will be given to the lines. And from the load flow results comparison has been done between low rank and high rank line outage contingencies. This contingency analysis helps the operational engineer to know which line outage is dangerous to the system and what prior action is to be taken to minimize the effect of that particular line outage.
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