用于解决电网输电阻塞的机组降压运行方案多阶段优选方法

发布时间：2018-04-04 11:06

本文选题：机组降压运行　切入点：电压偏移率　出处：《电力自动化设备》2017年01期

【摘要】：针对电网存在的500 kV网络传输容量不足问题,提出一种机组降压运行方案的多阶段优选方法。首先,根据机组电压等级和机组容量与负荷的匹配度确定降压机组方案的候选集合;然后,选取系统网损、线路潮流过载率、电压偏移率、静态电压稳定裕度、静态灵敏度和短路电流作为机组降压运行方案的评价指标,并构建线性加权的优化模型,采用变异系数法计算优化模型的权重,根据优化结果对待选降压方案进行综合排序;最后,对降压运行方案进行N-1校核和稳定性计算,综合分析各个方案对电网的安全稳定性影响,最终优选出降压运行方案。以某电网为例,结果表明所提方法能够有效缓解500 kV网络输电阻塞问题,降低网络损耗、优化网络架构。
[Abstract]:In order to solve the problem of insufficient transmission capacity in 500 kV power network, a multi-stage optimal selection method of unit voltage reduction operation scheme is proposed.Firstly, according to the voltage grade of the unit and the matching degree between the unit capacity and the load, the candidate set of the decompression unit scheme is determined. Then, the system network loss, line power flow overload rate, voltage offset rate, static voltage stability margin are selected.The static sensitivity and short-circuit current are used as the evaluation indexes of the operation scheme of the unit, and the linear weighted optimization model is constructed. The weight of the optimization model is calculated by using the variation coefficient method, and the selected voltage reduction scheme is ranked synthetically according to the optimization results.Finally, the N-1 check and stability calculation are carried out to analyze the influence of each scheme on the security and stability of the power network, and finally select the optimal operation scheme.Taking a power network as an example, the results show that the proposed method can effectively alleviate the transmission congestion problem of 500 kV network, reduce the network loss and optimize the network architecture.
【作者单位】：湖南大学电气与信息工程学院;国网湖南省电力公司经济技术研究院;
【基金】：国家电网公司科技项目(5216A213509X)~~
【分类号】：TM732

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