计及风险的城市中压配电网规划决策

发布时间：2018-01-06 14:30

本文关键词：计及风险的城市中压配电网规划决策　出处：《东北电力大学》2017年硕士论文　论文类型：学位论文

【摘要】：城市中压配电网是国民经济和社会发展的重要公共基础设施,作为电力系统的末端环节,承担着直接向用户提供电能的任务,因此,合理的规划城市中压配电网是其为用户提供优质电能的有力保障。目前,在城市中压配电网规划领域,关注的焦点在于规划方法和规划方案的选择,而对于规划方案的优劣没有比较全面的衡量标准。本文以我国东北某城市经济技术开发区中压配电网规划项目为基础,研究了在已知供电可靠性统计数据下的规划区规划优先级确定问题、中压配电网接线方式的选择和综合评估问题以及电网规划方案的评估决策问题。针对东北某城市经济技术开发区配电网规划优先级的确定问题,以供电可靠性统计数据为基础,将规划区依据变电站主变互联关系划分为多个独立的供电分区,通过基于主成分分析的供电可靠性评估模型对多个供电分区进行可靠性评估,依据评估结果得到各供电分区的规划优先级;通过绘制各供电分区的指标满意度及重要性区域图,为配电网规划提供了理论依据。针对经开区配电网规划优先级的工程实例分析,验证了方法的有效性。基于满足中压配电网网架安全性的基本要求,依据基元接线理论建立了中压配电网接线方式选择模型和规则库,并基于模型和规则库在Visual Studio 2010工具平台上开发了中压配电网接线方式选择软件;依据规划区内边界条件确定基元变量,通过软件参数设置得到接线方式;为综合评估接线方式,从风险性、可靠性和经济性考虑构建接线方式综合评估指标体系,引入模糊隶属度函数量纲化各指标值,得到待评估接线方式的综合评分进而选出最优接线方式。最后,以经开区供电区域内接线方式选择的实例分析证明了方法的合理性。以中压配电网规划的目的为导向,从网架风险性、电网整体协调性、供电可靠性和经济性的角度考虑构建了规划电网方案综合评估指标体系;为了对规划电网的风险水平进行准确评估,引入了一种考虑网架结构缺陷带来潜在风险的配电网风险评估方法,通过建立网架风险指标体系,并结合风险量化值的计算及风险等级的划分确定规划电网的综合风险水平;基于配电网协调配合性的规划要求,从容载比合理度和负载均衡度两个方面对规划电网进行协调性评估。最后给出规划电网评估的具体实施步骤,以经开区某规划区域内的两个规划方案的工程实例分析验证了方法的有效性,对规划电网的评估决策具有指导意义。
[Abstract]:Urban medium voltage distribution network is an important public infrastructure for national economy and social development. As the terminal link of power system, it undertakes the task of providing electricity directly to users. Reasonable planning of urban medium voltage distribution network is the effective guarantee to provide high quality power to users. At present, in the field of urban medium voltage distribution network planning, the focus is on the choice of planning methods and planning schemes. However, there is no comprehensive measurement standard for the planning scheme. This paper is based on the mid-voltage distribution network planning project of a city economic and technological development zone in Northeast China. In this paper, the problem of determining the priority of the planning area under the known statistical data of power supply reliability is studied. The selection and comprehensive evaluation of the medium voltage distribution network connection mode and the evaluation decision of the power network planning scheme are discussed. The priority of the distribution network planning in a city economic and technological development zone in Northeast China is determined. Based on the statistical data of power supply reliability, the planning area is divided into several independent power supply zones according to the interconnection relationship of substation main transformer. The reliability evaluation model of power supply based on principal component analysis (PCA) is used to evaluate the reliability of multiple power supply zones, and according to the evaluation results, the planning priorities of each power supply zone are obtained. This paper provides a theoretical basis for distribution network planning by drawing the index satisfaction degree and importance area diagram of each power supply district, and analyzes the engineering example of priority of distribution network planning in open area. The validity of the method is verified. Based on the basic requirements of security of medium voltage distribution network, the selection model and rule base of medium voltage distribution network connection mode are established according to the basic wiring theory. Based on the model and rule base, the software of medium voltage distribution network connection mode selection is developed on the platform of Visual Studio 2010. The basic variables are determined according to the boundary conditions in the planning area, and the wiring mode is obtained by setting the software parameters. In order to evaluate the connection mode synthetically, the comprehensive evaluation index system is constructed from the consideration of risk, reliability and economy, and the dimensionalized index value of fuzzy membership function is introduced. Get the comprehensive score of the wiring mode to be evaluated and then select the optimal connection mode. Finally. The rationality of the method is proved by the example of the selection of the connection mode in the power supply area of the open area, which is guided by the goal of the medium voltage distribution network planning, and is based on the risk of the grid frame and the overall coordination of the power network. Considering the reliability and economy of power supply, the comprehensive evaluation index system of planning power network scheme is constructed. In order to accurately evaluate the risk level of the planned power grid, a distribution network risk assessment method considering the potential risk caused by the defects of the grid structure is introduced, and the risk index system of the grid structure is established. Combined with the calculation of the risk quantification value and the division of the risk grade, the comprehensive risk level of the planning power network is determined. Based on the planning requirements of coordination and coordination of distribution network, this paper evaluates the coordination of planning power network from two aspects: the reasonable degree of ease to load ratio and the load balance degree. Finally, the concrete implementation steps of planning network evaluation are given. The effectiveness of the method is verified by an engineering example of two planning schemes in a planning area, which is of guiding significance to the evaluation and decision of the planning power network.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM715

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