配电网故障恢复优化算法研究

发布时间：2018-02-09 01:16

本文关键词： 配电网潮流计算孤岛划分故障恢复算法　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：我国电力需求越来越大，电力事业也不断发展，电网的自动化水平随之提高，配电自动化就是其中的一个重要方面。配电网故障发生后，迅速完成对故障的识别、隔离和处理，是配电自动化的一项重要任务。充分考虑配电网的实际运行情况，研究高效、实用的算法，形成故障恢复软件，对于实现故障隔离后非故障失电区快速恢复供电具有十分重要的意义。同时，分布式发电技术大量应用于配电网中，对传统配电网产生了重大的影响，因此，在研究配电网故障恢复时，不得忽略DG的影响，要将其纳入考虑范围内。本文主要对配电网故障处理中的故障恢复部分进行了深入的研究。分析了我国配电网结构和运行特点，同时兼顾到故障恢复快速可靠的要求，采用前推回推潮流算法计算配电网三相潮流，以此为基础，进行后续的故障恢复工作。将故障恢复工作分为两步进行，首先针对非故障失电区内的DG，采用动态孤岛划分策略，通过离线生成的数据提高搜索效率，并通过在线动态搜索，形成最佳孤岛；然后，将孤岛作为可调度负荷，参与到孤岛外失电网络的供电恢复中，提出两种故障恢复算法。一是改进二进制粒子群算法，规定粒子位移更新规则，以保证配电网的辐射状运行要求，并针对算法本身易于“早熟”的缺陷进行了改进；二是支路交换—粒子群算法，结合了支路交换法快速高效和粒子群算法全局寻优的特点，将粒子位移取为联络开关，对于形成的环网，采用支路交换法确定要打开的分段开关，可显著提高算法的计算速度，通过IEEE33节点配电系统算例对两种算法进行了对比验证，结果表明，两种算法均能得到最优恢复方案，并且支路交换—粒子群算法相较于改进二进制粒子群算法，计算效率很高。最后，通过含分布式发电的综合算例验证了本文算法结果的可靠性，，并通过对实际示范线路的仿真测试，验证了本文算法的实用性。本文的故障恢复算法综合考虑了DG的影响及配电网的特点，能够在短时间内得出恢复结果，随着DG的接入量不断增大，该算法具有很高的实用价值，将其运用到配电自动化中，可以迅速形成故障恢复方案，协助调度人员作出决策。
[Abstract]:With the increasing demand for electric power and the continuous development of power industry in China, the automation level of the power network has been improved, and distribution automation is one of the important aspects. After the fault of the distribution network occurs, the identification, isolation and treatment of the fault are quickly completed. Distribution automation is an important task. Considering the actual operation of the distribution network, studying the efficient and practical algorithm and forming the fault recovery software, it is very important to realize the fast recovery of the power supply in the non-fault power loss area after the fault isolation, at the same time, Distributed generation technology is widely used in distribution network, which has a great impact on traditional distribution network. Therefore, DG influence should not be ignored in the study of distribution network fault recovery, and it should be taken into account. In this paper, the fault recovery part of distribution network fault processing is studied deeply. The structure and operation characteristics of distribution network in China are analyzed, and the requirement of fast and reliable fault recovery is considered. The forward push-back power flow algorithm is used to calculate the three-phase power flow in the distribution network, and the subsequent fault recovery work is carried out. The fault recovery work is divided into two steps. Firstly, the dynamic islanding strategy is adopted for DG in the non-fault power loss area. The data generated offline can improve the search efficiency and form the best isolated island through on-line dynamic search. Then, the isolated island is used as the schedulable load to participate in the restoration of power supply of the off-line power loss network. Two kinds of fault recovery algorithms are proposed. One is to improve the binary particle swarm optimization (BPSO) algorithm by prescribing the rules of particle displacement updating to ensure the radial operation requirements of the distribution network, and to improve the algorithm itself because it is easy to "precocity"; The second is branch commutation-particle swarm optimization algorithm, which combines the fast and high efficiency of branch switching method and the global optimization of particle swarm optimization algorithm. The particle displacement is taken as a contact switch. For the formed ring network, the branch switching method is used to determine the segmental switch to be opened. The calculation speed of the algorithm can be improved significantly. The comparison between the two algorithms is carried out through the example of IEEE33 node distribution system. The results show that the two algorithms can obtain the optimal recovery scheme. And the branch commutation-particle swarm optimization algorithm is more efficient than the improved binary particle swarm optimization algorithm. Finally, the reliability of the proposed algorithm is verified by a comprehensive example with distributed generation. The practicability of the proposed algorithm is verified by the simulation test of the actual demonstration circuit. Considering the influence of DG and the characteristics of distribution network, the fault recovery algorithm in this paper can get the recovery result in a short time. With the increasing of DG access, the algorithm has a high practical value. The fault recovery scheme can be formed quickly by applying it to distribution automation, and it can help dispatcher to make decision.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM73

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