考虑配电自动化与分布式电源接入的配电系统可靠性评估

发布时间：2018-06-22 23:27

本文选题：配电系统 + 可靠性评估　；参考：《华北电力大学》2017年硕士论文

【摘要】：配电系统拓扑复杂、元件维数较高,其供电可靠性的高低与用户息息相关。不断提高配电系统的供电可靠性是当前电力系统一直努力的方向。作为智能电网的基础,配电自动化开关具有动作迅速、准确度高等优点,近年来在配电系统中得到了广泛的应用。与此同时,分布式电源凭借其环保清洁、运用灵活等优点,也越来越多地接入到配电系统。分布式电源接入并实现配电自动化后,配电系统可靠性评估的模型、方法和指标与传统的可靠性评估均存在较大的差别,因而有必要对接入后的配电系统进行建模,并提出新的可靠性评估算法。本文分别实现了考虑配电自动化与含分布式电源的配电系统可靠性评估。与传统的手动开关相比,配电自动化开关具有良好的动作特性,开断操作甚至可在几秒内完成;但动作过程可能会导致负荷点经历瞬时停电,而传统配电系统可靠性评估的研究并未过多考虑瞬时停电事件。针对这方面的不足,本文将配电自动化开关在故障恢复过程中的动作时序进行分析后,引入了瞬时停电频率指标。同时考虑到含多联络及多分段开关配电系统供电恢复路径的多样化,对供电恢复过程进行建模,采用改进遗传算法实现了故障重构;根据得到的最优重构方案,基于故障模式后果分析法实现可靠性评估。针对分布式电源接入后配电系统的可靠性评估,本文首先建立风电机组和光伏电源的出力模型,然后分别从是否可作主电源的备用和是否与主电源存在通路两方面对分布式电源进行了分类,并从故障恢复的角度构建含不同类型DG的故障重构方案;最后根据得到的方案,采用序贯蒙特卡洛模拟算法实现含分布式电源的配电系统可靠性评估。
[Abstract]:The topology of distribution system is complex and the dimension of components is high. The reliability of power supply is closely related to the users. Improving power supply reliability of distribution system is the direction of current power system. As the basis of smart grid, distribution automation switch has been widely used in distribution system in recent years because of its advantages of quick operation and high accuracy. At the same time, distributed power supply (DG) is more and more connected to distribution system because of its environmental protection and cleanness and flexibility. After the distributed power supply is connected and the distribution automation is realized, the reliability evaluation model, method and index of the distribution system are different from the traditional reliability evaluation, so it is necessary to model the distribution system after the access. A new reliability evaluation algorithm is proposed. In this paper, the reliability evaluation of distribution system including distribution automation and distributed generation is realized. Compared with the traditional manual switch, the distribution automation switch has good operation characteristics, and the on-off operation can be completed in a few seconds, but the operation process may lead to the transient blackout at the load point. However, the traditional research on reliability evaluation of distribution systems does not take transient power outages into account. In view of this deficiency, this paper introduces the instantaneous power outage frequency index after analyzing the operation time sequence of distribution automation switch in the process of fault recovery. At the same time, considering the diversification of power supply recovery paths in multi-connection and multi-segment switching distribution systems, the power supply recovery process is modeled, and the fault reconstruction is realized by using improved genetic algorithm. Reliability evaluation is realized based on fault mode consequence analysis method. In order to evaluate the reliability of distribution system after distributed power supply is connected, this paper first establishes the model of wind turbine and photovoltaic power supply. Then it classifies the distributed power supply from the aspects of whether it can be used as the backup of the main power supply and the existence path of the main power supply, and constructs the fault reconstruction scheme with different types of DG from the point of view of fault recovery; finally, according to the obtained scheme, The sequential Monte Carlo simulation algorithm is used to evaluate the reliability of distribution system with distributed power supply.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732

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