电力系统电压稳定性分析指标的研究与应用

发布时间：2019-05-06 13:37

【摘要】：随着工业化、现代化水平的提高,京津唐、珠三角、长三角地区逐步形成了一系列特大型城市和重负荷中心。这些区域具有外受电比例大,无功设施建设相对不足,电网有功承载能力有限的特点,电压稳定性问题较为严重。电力系统电压稳定性分析指标可以用于对电网的电压稳定性进行评估,并能够对电网系统中的薄弱区域进行辨识。基于指标计算结果,可以在电网中加装无功补偿来提高关键节点或区域的电压稳定性。因此,合理的电力系统电压稳定性分析指标,具有一定的工程应用价值。本文对电力系统电压稳定性分析指标进行了研究。按照静态指标和暂态指标两类,在已经提出的指标的基础上进行改进,提出了一些适用性和准确性更强的新的指标,并在算例系统对所提出指标的数值进行计算和对比分析。然后根据指标计算结果提出无功补偿配置方案,并与其他配置方案进行对比,研究各种指标在引导动态无功补偿配置方面的应用效果。主要包括如下内容:(1)对工程中常用的静态电压稳定指标中的阻抗模裕度指标和灵敏度指标的原理进行了分析,并提出了一种基于网络导纳矩阵的静态电压稳定指标——电压关联裕度指标。以北京现状电网为例,对三种静态电压稳定性指标的数值进行了计算和对比分析,并基于有功裕度验证了这三种静态电压稳定性指标对薄弱节点和薄弱区域的评估能力。(2)对于大比例受端系统,介绍了一种基于时域仿真的暂态电压稳定指标——电压跌落面积指标;对于多直流馈入系统,分析并完善了一种考虑动态元件的多馈入短路比指标。并分别以北京现状电网、华东远景年规划电网为例,对上述两个指标的性能进行了分析。(3)对本文中涉及的阻抗模裕度指标、灵敏度指标、电压关联裕度指标、电压跌落面积指标和考虑动态元件模型的多馈入短路比指标在引导无功补偿配置方面的应用进行了研究。根据上述指标在算例系统中的节点薄弱性排序来制定无功补偿装置加装方案,并与未加装时及其他加装方案进行对比,验证了本文所提指标的有效性和在引导无功补偿配置方面的应用价值。论文成果可对电力系统的静态和暂态电压稳定性进行更加完备的分析,较为有效地对电网系统中的电压稳定性薄弱区域、薄弱节点进行辨识。基于本论文中所提出的电压稳定性分析指标,可以制定出更加高效的动态无功补偿方案,提高无功补偿的配置效果。
[Abstract]:With the improvement of industrialization and modernization, a series of super-large cities and heavy load centers have gradually formed in Beijing-Tianjin-Tang, Pearl River Delta and Yangtze River Delta. These areas have the characteristics of large proportion of external electricity, insufficient construction of reactive power facilities, limited active power carrying capacity of power grid, and serious problem of voltage stability. The voltage stability index of the power system can be used to evaluate the voltage stability of the power network and identify the weak areas in the power system. Based on the calculated results, reactive power compensation can be added to the grid to improve the voltage stability of key nodes or regions. Therefore, reasonable power system voltage stability index has certain engineering application value. In this paper, the voltage stability index of power system is studied. According to the static index and the transient index, some new indexes with stronger applicability and accuracy are put forward, and the numerical values of the proposed indexes are calculated and compared with each other in an example system, which is improved on the basis of the indexes that have been put forward. Then the reactive power compensation configuration scheme is put forward according to the result of index calculation, and compared with other configuration schemes, and the application effect of various indexes in guiding dynamic reactive power compensation configuration is studied. The main contents are as follows: (1) the principles of impedance mode margin index and sensitivity index in the commonly used static voltage stability index are analyzed. A static voltage stability index-voltage correlation margin index based on network admittance matrix is proposed. Taking Beijing current power grid as an example, the numerical values of three static voltage stability indexes are calculated and compared. Based on the active power margin, the evaluation ability of these three static voltage stability indexes for weak nodes and weak regions is verified. (2) for large proportion of receiving systems, A transient voltage stability index-voltage sag area index based on time domain simulation is introduced. For multi-feed-in system, an index of multi-feed short-circuit ratio considering dynamic elements is analyzed and perfected. Taking Beijing current power grid and East China long-term planning power grid as examples, the performance of the above two indexes is analyzed. (3) the impedance mode margin index, sensitivity index, voltage correlation margin index, which are involved in this paper, are analyzed. The application of voltage sag area index and multi-feed short-circuit ratio index considering dynamic element model in guiding reactive power compensation configuration is studied. According to the ranking of node weakness of the above indexes in the numerical example system, the scheme of adding reactive power compensation device is worked out, and compared with the non-installed and other installation schemes. The validity of the proposed index and its application value in guiding reactive power compensation configuration are verified. The results of this paper can make a more complete analysis of the static and transient voltage stability of the power system, and identify the weak nodes and the weak regions of the voltage stability in the power system more effectively. Based on the voltage stability index proposed in this paper, a more efficient dynamic reactive power compensation scheme can be worked out, and the configuration effect of reactive power compensation can be improved.
【学位授予单位】：中国电力科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712

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