基于最大供电能力的中压配电网联络结构优化

发布时间：2018-03-03 11:32

  本文选题：配电网　切入点：最大供电能力　出处：《东北电力大学》2017年硕士论文　论文类型：学位论文

【摘要】：国家能源局印发的《配电网建设改造行动计划(2015—2020年)》提出,将优化完善结构、消除薄弱环节作为重点任务,开展配电网网架优化行动,加强中压配电网站间联络,构建坚强的负荷转移通道,提升供电灵活性及可靠性,提升城镇地区供电能力及供电安全水平。同时,由于配电网通常采用“闭环设计,开环运行”,而联络线作为闭环中的重要一环,起着提高供电可靠性、加强供电能力和提高设备利用率的关键作用,是供电恢复和负荷转带的重要通道,故联络结构规划结果的优劣直接影响了整个配电网的运行安全性及经济性。本文建立一种基于帕累托最优的主变联络结构规划模型。首先,在考虑N-1安全准则及实际运行条件的基础上,分析主变短时允许过载系数及负荷二次转供过程对配电网最大供电能力(Total Supply Capability,TSC)的影响,建立基于馈线互联关系的TSC计算模型,采用线性规划法实现对模型的求解,同时,利用馈线负载均衡模型得到配电网达到TSC时负荷的最优分布情况。其次,为兼顾联络结构规划的有效性和经济性,建立计及配电网TSC和最小联络费用的联络结构多目标规划模型,在计算联络费用时,考虑地理因素的影响,采用带有精英策略的非支配排序遗传算法(Non-dominated Sorting Genetic Algorithm-Ⅱ,NSGA-Ⅱ)对模型进行求解,将所得帕累托前沿中的个体作为备选方案,利用变异系数法和TOPSIS法对其进行排序,选取最佳联络结构规划方案。所得规划结果不仅包含各主变间联络通道建设结果,同时明确地表明通道内联络支路的数量及位置。最终,工程实例分析结果表明该方法是正确、有效的。
[Abstract]:The Plan of Action for the Construction and Transformation of Distribution Networks (2015-2020), issued and issued by the State Energy Administration, proposes that optimizing and perfecting the structure, eliminating weak links as a key task, carrying out the optimization of the distribution network structure, and strengthening the liaison between the medium-voltage distribution websites, Build a strong load transfer channel, improve the flexibility and reliability of power supply, improve the power supply capacity and safety level in urban areas. At the same time, because the distribution network is usually "closed-loop design," As an important link in the closed loop, the tie line plays a key role in improving the reliability of power supply, strengthening the power supply capacity and improving the utilization rate of the equipment. It is an important channel for power supply recovery and load transfer. Therefore, the result of the connection structure planning has a direct impact on the safety and economy of the whole distribution network. In this paper, a Pareto optimal model of the main transformer connection structure planning is established. On the basis of considering the N-1 security criterion and practical operation conditions, this paper analyzes the influence of the short-time allowable overload coefficient and the secondary load transfer process of the main transformer on the maximum power supply capacity of the distribution network Total Supply capability TSC, and establishes a TSC calculation model based on the feeder interconnection relationship. The linear programming method is used to solve the model. At the same time, the optimal distribution of load when the distribution network reaches TSC is obtained by using the feeder load balancing model. Secondly, in order to give consideration to the efficiency and economy of the connection structure planning, A multi-objective programming model with TSC and minimum contact cost for distribution network is established. The influence of geographical factors is taken into account in the calculation of liaison cost. Non-dominated Sorting Genetic algorithm (NSGA- 鈪，

本文编号：1560867