共查询到18条相似文献,搜索用时 125 毫秒
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暂态稳定性能指标的大小能够反映电力系统事故的严重程度,可以作为事故选择的依据。该文提出一种以选出严重事故为目标,通过快速计算性能指标的综合值进行事故扫描的综合性能指标法。该方法严重事故捕获率高、计算速度快,能够满足动态安全分析系统在线应用的要求。通过NEW ENGLAND 10机系统的仿真算例,验证了该方法的有效性。 相似文献
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暂态稳定性能指标的大小能够反映电力系统事故的严重程度,可以作为事故选择的依据.该文提出一种以选出严重事故为目标,通过快速计算性能指标的综合值进行事故扫描的综合性能指标法.该方法严重事故捕获率高、计算速度快,能够满足动态安全分析系统在线应用的要求.通过NEW ENGLAND 10机系统的仿真算例,验证了该方法的有效性. 相似文献
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一种基于ANN技术的预想事故自动选择方法 总被引:1,自引:0,他引:1
本文提出了一种基于人工神经元网络(ANN)技术的预想事故自动选择方法,利用快速解耦潮流计算的迭代一次法(FDLF1)构造了分别对应于支路有功潮流越限的有功功率性能指标PIp 和对应于节点电压模值和发电机无功出力越限的电压- 无功性能指标PIVQ。用BP算法训练多层感知型神经元网络以求得对应于不同运行状态和不同网络拓扑结构的性能指标。通过算例分析,并与其它经典方法的比较,本方法在计算精度和速度方面非常令人满意,而且具有较高的事故捕获率。 相似文献
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本文开发了一种基于人工神经元网络和快速付里叶变换技术进行预想事故快速选的方法。利用快速解耦潮流计算的迭代一次法分别构造了反映预想事故严重程度的有功性能指标PIp和无功性能指标PIv,同是还构造了一个多层感知型神经元网络并用BP算法加以训练。 相似文献
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本文提出了一种基于人工神经元网络(ANN)技术的预想事故自动选择方法,利用快速解耦潮流计算的迭代一次法(FDLF1)构造了分别对应于支路有功潮流越限的有功功率性能指标PIP和对应于节点电压模值和发电机无功出力越限的电压-无功性能指标PLVQ。用BP算法训练多层感知型神经元网络以求得对应于不同运行状态和不同网络拓扑结构性能指标。通过算例分析,并与其它经典方法的比较,本方法在计算精度和速度方面非常令人 相似文献
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综合性能指标法是用于事故扫描的一种比较有效的方法,然而利用该方法每次得到的性能指标排序表只能利用一次,利用率不高。为此,通过对线路两端设定事故,将综合性能指标表进行重组,使其能重复利用,同时提出了利用改进后的综合性能指标表来判断线路不同位置发生事故严重性的方法。该方法简单、准确性较好,可以满足工程和科研上的需求。 相似文献
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简要地介绍了用常规方法计算电感值存在的困难,推导出一种计算电感的公式 ,从而绕开了对磁材磁性能指标如B,及μ值的准确了解,而能顺利计算出所需的电感值。 相似文献
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The objective of this paper is to propose a fast, accurate, and robust method for ranking contingencies according to their severities as far as voltage stability is concerned. In general terms, the proposed procedure consists of obtaining the operating state and computing performance indices for each contingency of a predefined list. The contingencies are then ranked according to their performance indices. The proposed method can be used as a real time operation tool, since its computational effort is very small. The proposed method is able to pick most of the severe contingencies, resulting in very good capture ratios. Simulation results are shown for small test and large realistic power systems. 相似文献
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ABSTRACT A simple and efficient method for optimal selection of weights, along with higher order performance indices for voltage contingency selection, has been suggested in this paper. Some of the existing performance indices for voltage contingency selection has been critically reviewed. The proposed performance indices are able to eliminate misranking and masking effects. The post-outage quantities have been computed, using a new set of distribution factors, defined in terms of pre-outage real and reactive power flows in transmission lines/ outputs of generators. The proposed algorithm has been tested on IEEE 14-bus system and a practical 75-bus Indian system. 相似文献
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基于统计学习的模糊暂态稳定事故筛选与排序 总被引:3,自引:0,他引:3
暂态稳定事故筛选与排序的目的是针对一组预想事故集合挑选出严重事故或滤除掉无害事故,以减少待分析的预想事故数目,满足在线动态安全分析的需要.文中提出一种基于统计学习的模糊暂态稳定事故筛选与排序方法,该方法采用了反映事故严重程度的10个性能指标,并通过样本学习,在每个指标集合上具体定义了系统稳定性的模糊隶属度函数;然后综合运用这10个性能指标的稳定性模糊隶属度得到的平均稳定性模糊隶属度,对预想事故集合按严重性进行了排序;接着根据排序结果,结合所设定的稳定阈值,将无害事故过滤掉.最后,用新英格兰10机39节点网络验证了该方法的有效性. 相似文献
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A. O. Ekwue 《Electric Power Systems Research》1991,20(3):215-223
Automatic contingency selection in a power system determines a priori the set of contingencies to be investigated. The paper proposes a technique which determines performance indices for voltage drop and line overloads using a second-order load flow program based on rectangular coordinates and a compensation procedure for single-line outage evaluation. 相似文献
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Fast contingency screening is expected to be an integral part of any practical online dynamic security analysis (DSA). Ranking of contingencies requires the use of severity indices, and for DSA such an index must be a measure of stability. From experience in static security analysis, it is well known that some indices work better than others for particular power systems and that combinations of indices usually work better than a single index. For DSA, which is still in its infancy, severity indices are more complex and very few have been tested for screening. In this paper, several indices are proposed for contingency screening in online DSA. These indices are based on the concepts of coherency, transient energy conversion between kinetic energy and potential energy and three dot products of system variables. Test results on realistic power systems show the promise of these indices in contingency screening 相似文献
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K. Shanmukha Sundar H.M. Ravikumar 《International Journal of Electrical Power & Energy Systems》2012,34(1):29-37
This paper focuses on the optimal power flow solution and enhancement of system performance without sacrificing the security of the system via optimal location and optimal sizing of Thyristor Controlled Series Compensator (TCSC) when the system is operating under normal and network contingency conditions. The paper presents a secured optimal power flow solution by integrating TCSC with the optimization model developed under normal and contingency cases. The optimization model developed in this paper is solved by using linear programming method. New indices called Thermal Capacity Index (TCI) and Contingency Capacity Index (CCI) are proposed for placing the TCSC at appropriate location under normal and network contingency conditions respectively. Once the location to install TCSC is identified, the optimal setting of TCSC is determined through the software code written in MATLAB. The proposed approach is carried out on 6-bus, IEEE 14-bus and IEEE 118-bus test systems and the simulation results are presented to validate the proposed method. 相似文献
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模糊子集和Taylor级数相结合的快速事故筛选方法 总被引:1,自引:1,他引:0
为避免在暂态稳定分析中稳定与不稳定状态的漏报,文中结合模糊子集理论和高阶Taylor级数,提出了一种用于在线暂态安全分析的快速事故筛选方法。该方法首先定义了7种 反映事故严重程度的性能指标,并把它们作为模糊隶属函数的组合特征输入量,然后通过多 元 多变量的模糊隶属函数,产生一个能够指示相对稳定裕度的连续分布的暂态稳定指标。基于这个连续分布的稳定指标,可为运行人员提供3条带,即“绝对”稳定带(稳定指标大)、“绝 对 ”不稳定带(稳定指标小)、“模糊”带(稳定指标处于中间值,即稳定与不稳定边界地带 ),有了这3条带,就可对预想事故进行快速的暂态稳定识别。计算仿真结果表明了该方法 的快速性、可靠性和有效性。 相似文献