含分布式电源的智能配电网保护策略

发布时间：2018-03-20 05:09

本文选题：配电网　切入点：分布式发电　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国可再生能源的大量开发利用,分布式发电作为一种高效利用可再生能源并且接入灵活的发电方式得到了广泛的关注。然而分布式发电大规模接入配电网,配电网原有的辐射性结构被改变,导致辐射型结构整定的原有配电网保护策略无法快速、准确动作。基于此背景,本文针对大规模分布式发电接入配电网给原有保护策略带来的影响进行了研究,以解决目前存在的问题。本文首先分析了现有配电网的结构、故障特点与保护配置现状,掌握当下配电网的网络结构与保护逻辑。接着对逆变型分布式发电的控制策略进行分类,并分析相应的故障电流特征,理论推导出分布式发电对配电网保护以及重合闸影响。此外仿真分析了分布式发电容量与接入位置对保护的影响。深入研究目前主流的含分布式发电的配电网保护策略,详细分析其优劣并着重研究了分区纵联保护策略。针对大容量分布式发电降低分区末端电流保护灵敏度的问题,提出了基于节点信息的配电网智能分区技术,并由此形成配电网节点信息矩阵,记录配电网的节点连接、断路器配置、分布式发电接入位置与容量和需调整定值的断路器编号情况。再依此矩阵对相应的保护进行重新整定,使其正确动作。此方案在分布式发电单元功率较大的情况下仍可正确切除故障,有较高的可靠性。上述针对分区纵联保护的改进方案有利于解决大规模分布式发电接入给配电网保护带来的影响,为分布式发电进一步发展与智能配电网保护方案的实施创造了条件。
[Abstract]:With the development and utilization of renewable energy in China, distributed generation, as a kind of efficient renewable energy and flexible power generation, has been paid more and more attention. However, distributed generation is connected to the distribution network on a large scale. The original radiation structure of the distribution network has been changed, which leads to the failure of fast and accurate operation of the original distribution network protection strategy set by the radiation structure. In this paper, the influence of large-scale distributed generation access to distribution network on the original protection strategy is studied in order to solve the existing problems. Firstly, the structure, fault characteristics and protection configuration of the existing distribution network are analyzed. Master the network structure and protection logic of the current distribution network. Then classify the control strategy of the inverter distributed generation and analyze the corresponding fault current characteristics. The influence of distributed generation on distribution network protection and reclosing is derived theoretically. In addition, the influence of distributed generation capacity and access location on protection is analyzed. This paper analyzes its merits and demerits in detail, and emphatically studies the strategy of zonal longitudinal protection. Aiming at the problem of reducing the sensitivity of terminal current protection for large capacity and distributed generation, a smart partition technology based on node information is proposed for distribution network. The node information matrix of distribution network is formed to record the node connection, circuit breaker configuration, the location and capacity of distributed generation access and the number of circuit breakers to be adjusted according to this matrix. This scheme can remove the fault correctly even when the power of the distributed generating unit is large. The improved scheme for zonal longitudinal protection is helpful to solve the impact of large-scale distributed generation access on distribution network protection. It creates conditions for the further development of distributed generation and the implementation of smart distribution network protection scheme.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM77

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