电力系统脆弱性节点的筛选方法研究
发布时间：2018-08-16 18:22
【摘要】：如今电力系统已经发展成为超大规模的复杂互联系统,这不仅使系统的运行行为更复杂,而且也使系统发生连锁故障的可能性增大,也更容易导致大面积停电事故的发生。评估电力系统的脆弱程度,为电力系统安全运行制定正确的应对措施提供一定的理论依据,是防范和减少电网停电事故的一项重要的基础性工作。 本文分析了电力系统节点脆弱性的特点,提出了将电力系统节点脆弱性分为状态脆弱性和结构脆弱性。建立了利用节点的相对电压裕度构建的节点状态脆弱性指标,研究了节点状态脆弱性的评估方法,利用改进的非线性潮流算法计算电力系统节点的临界电压,进而计算节点状态脆弱性指标；建立了利用节点的重要度构建的节点结构脆弱性指标,研究了节点结构脆弱性的评估方法,提出了利用节点收缩算法来获得各个节点的重要度,进而计算节点结构脆弱性指标；对这两方面给予适当的权重,构建了节点的综合脆弱性指标；研究了节点综合脆弱性的评估方法,提出了利用变权层次分析法确定各节点合理的权重值,进而计算节点综合脆弱性指标；利用MATLAB软件编程应用于IEEE14节点系统验证了所提电力系统脆弱性评估方法的有效性。比较了风电场接入前后电力系统节点综合脆弱性的变化,分析了风电场接入后对电力系统节点脆弱性的影响,利用MATLAB软件编程应用于接入风场的IEEE14节点系统,结果表明风电场的接入对系统大部分节点的脆弱度有所改进,但风电场并网节点的脆弱度则有所增大。
[Abstract]:Nowadays, power system has developed into a large scale complex interconnected system, which not only makes the operation behavior of the system more complex, but also increases the possibility of system cascading faults, and also easily leads to the occurrence of large-scale power outages. It is an important basic work to evaluate the vulnerability of power system and to provide some theoretical basis for making correct countermeasures for the safe operation of power system. It is also an important basic work to prevent and reduce power outages. In this paper, the characteristics of power system node vulnerability are analyzed, and it is proposed that the power system node vulnerability can be divided into state vulnerability and structural vulnerability. Based on the relative voltage margin of the node, the state vulnerability index of the node is established, and the evaluation method of the node state vulnerability is studied. The critical voltage of the power system node is calculated by using the improved nonlinear power flow algorithm. Then the node state vulnerability index is calculated, the node structure vulnerability index constructed by using the node importance degree is established, the evaluation method of node structure vulnerability is studied, and the importance degree of each node is obtained by using node contraction algorithm. And then calculate the structural vulnerability index of nodes; give appropriate weight to these two aspects, construct the comprehensive vulnerability index of nodes; study the evaluation method of node comprehensive vulnerability. A variable weight Analytic hierarchy process (VWAHP) is proposed to determine the reasonable weights of each node, and then to calculate the comprehensive vulnerability index of the nodes, and the effectiveness of the proposed method is verified by the application of MATLAB software to the IEEE14 node system. This paper compares the changes of the comprehensive vulnerability of power system nodes before and after the wind farm access, analyzes the influence of the wind farm access on the power system node vulnerability, and applies the MATLAB software to the IEEE14 node system connected to the wind field. The results show that the connection of wind farm improves the vulnerability of most nodes in the system, but the vulnerability of connected nodes increases.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM73
本文编号：2186799
[Abstract]:Nowadays, power system has developed into a large scale complex interconnected system, which not only makes the operation behavior of the system more complex, but also increases the possibility of system cascading faults, and also easily leads to the occurrence of large-scale power outages. It is an important basic work to evaluate the vulnerability of power system and to provide some theoretical basis for making correct countermeasures for the safe operation of power system. It is also an important basic work to prevent and reduce power outages. In this paper, the characteristics of power system node vulnerability are analyzed, and it is proposed that the power system node vulnerability can be divided into state vulnerability and structural vulnerability. Based on the relative voltage margin of the node, the state vulnerability index of the node is established, and the evaluation method of the node state vulnerability is studied. The critical voltage of the power system node is calculated by using the improved nonlinear power flow algorithm. Then the node state vulnerability index is calculated, the node structure vulnerability index constructed by using the node importance degree is established, the evaluation method of node structure vulnerability is studied, and the importance degree of each node is obtained by using node contraction algorithm. And then calculate the structural vulnerability index of nodes; give appropriate weight to these two aspects, construct the comprehensive vulnerability index of nodes; study the evaluation method of node comprehensive vulnerability. A variable weight Analytic hierarchy process (VWAHP) is proposed to determine the reasonable weights of each node, and then to calculate the comprehensive vulnerability index of the nodes, and the effectiveness of the proposed method is verified by the application of MATLAB software to the IEEE14 node system. This paper compares the changes of the comprehensive vulnerability of power system nodes before and after the wind farm access, analyzes the influence of the wind farm access on the power system node vulnerability, and applies the MATLAB software to the IEEE14 node system connected to the wind field. The results show that the connection of wind farm improves the vulnerability of most nodes in the system, but the vulnerability of connected nodes increases.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM73
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