配电网接纳分布式电源网架适应性策略研究

发布时间：2018-03-07 03:01

本文选题：配电网　切入点：分布式电源　出处：《华北电力大学(北京)》2016年硕士论文　论文类型：学位论文

【摘要】：随着分布式发电技术及并网技术的快速发展,越来越多的分布式电源并入配电网运行,在带来经济效益和社会效益的同时也给配电网的规划设计、运行控制及故障恢复带来诸多影响。如何经济高效地对配电网进行更新改造以确保现状网络对大量分布式电源的安全消纳,是目前分布式电源并网及配电网建设面临的关键问题。为此,本文研究的主要目的在于通过对分布式电源并网影响的研究,针对配电网络建立全面、科学的评价体系,以此为基础提出具有工程实用价值的配电网适应性改造方案,力求达到资金投入、消纳水平与经济运行的多目标最优。本文研究的主要内容可概括如下：仿真分析分布式电源并网条件不同时对配电网稳态运行及短路故障的影响情况,总结得到分布式电源并网对配电网相关线路、变压器、开断设备及电流保护等主要设备的影响,并以此为基础提出配电网接纳分布式电源网架适应性评价指标体系,利用层次分析法和主成分分析法为评价指标赋权,并给出相应的评价方法及流程。该评价方法所需数据与工程实际相衔接,指标计算简便、意义明确,具有良好的普遍适用性和工程实用性。通过对某地区实际配电网进行适应性评价,定位配电网运行薄弱环节,并针对评价结果提出配电网适应性改造原则及改造策略。其中,改造策略包括配电设备改造方法和拓扑结构改造方法两部分内容,分别对两类改造方法进行算例分析,结果表明,应用所提方法确定的适应性改造方案对配电网薄弱设备及网架结构薄弱环节具有较强的针对性和实效性。分布式电源并网条件相同时,改造前后配电网设备及网架运行情况得到明显改善,配电网对分布式电源的消纳能力显著提高。
[Abstract]:With the rapid development of distributed generation technology and grid-connected technology, more and more distributed power sources are incorporated into the distribution network operation, which brings economic and social benefits to the distribution network planning and design. Operation control and fault recovery bring many effects. How to update and transform distribution network economically and efficiently to ensure the safety of the current network to a large number of distributed power generation, The main purpose of this paper is to establish a comprehensive and scientific evaluation system for the distribution network through the study of the influence of the distribution network. On the basis of this, the adaptive transformation scheme of distribution network with practical engineering value is put forward to achieve the capital input. The main contents of this paper can be summarized as follows: the simulation analysis of the influence of distributed power supply on the steady state operation and short circuit fault of distribution network under different conditions of grid connection at the same time. The influence of distributed power grid connection on distribution network related lines, transformers, turn-off equipments and current protection is summarized. Based on this, an index system for evaluating the adaptability of distributed power grid is put forward. The analytic hierarchy process (AHP) and principal component analysis (PCA) are used to empower the evaluation index, and the corresponding evaluation method and process are given. The data needed by the evaluation method are connected with the engineering practice, the calculation of the index is simple, and the significance is clear. It has good general applicability and engineering practicability. By evaluating the adaptability of distribution network in a certain area, the weak link of distribution network operation is located, and according to the result of evaluation, the principle and strategy of adaptive transformation of distribution network are put forward. The transformation strategy includes two parts: the transformation method of distribution equipment and the method of topological structure transformation. The examples of the two kinds of transformation methods are analyzed, and the results show that, The adaptive transformation scheme determined by the proposed method has strong pertinence and effectiveness for weak equipment and weak links of grid structure in distribution network. Before and after the transformation, the operation of distribution network equipment and grid structure has been improved obviously, and the absorption capacity of distribution network to distributed generation has been improved significantly.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM727

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