含分布式电源的配电网络供电恢复研究

华北电力高校本科毕业设计（论文） 毕 业 设 计论文 院 系 电力工程系 专业班级 电气化专业0505班 学生姓名 赵 懿 指导老师 徐玉琴 含分布式电源的配电网络供电复原问题探讨 题 目 二○○九年六月 II 含分布式电源的配电网络供电复原问题探讨 摘要 含分布式电源配电网发生故障后，通过对开关的操作可以变更网络的运行方式，包括孤岛运行的方式，选择一种最优方案，进行故障复原提高供电牢靠性。 本文对配电网进行分析，建立配电网的变结构耗散网络模型，并对配电网的潮流算法进行了改进，采纳收敛速度快的前推回代算法进行潮流计算，对包含分布式电源的配电网进行简化计算，分布式电源节点等效为PQ节点，从而可以节约计算的时间，提高了计算的效率。 其次，在介绍遗传算法原理的基础上，对编码方法及相应的遗传操作策略、评判方法以及适应度函数的设计等进行了一些改进，针对遗传算法的局限性、选择操作、交叉率与变异率的选取问题，对遗传操作步骤作了改进，采纳适应度比例法与最佳个体保存法相结合的选择方法，在优化过程中采纳改进自适应调整的交叉率和变异率，削减了使搜寻陷入局部最优的可能性，提高了计算效率。 最终，建立故障复原的数学模型，以复原负荷最大为目标函数，应用遗传算法搜寻最优解，算例结果验证了该算法的效果，并对含分布式电源后对配电网复原重构的影响进行了分析。 关键词配电网；故障复原；遗传算法；前推回代法；潮流计算；分布式电源 Research on distribution network service restoration considering distributed generation Abstract When, after the failure of distribution network, through the operation of the switch can change the network operating mode, select an optimal program for Reconstruction Recovery and improve the reliability of the power supply. In this paper, first of all determine fault section in order to isolate faults. Analysis of the distribution network, the establishment of distribution network dissipation variable structure network model, and the trend of distribution network to improve the algorithm, the fast convergence of the previous generation of back flow calculation algorithm, which can save computing time and improve the efficiency of the calculation. Secondly, introducing the principle of genetic algorithm based on the coding and corresponding genetic manipulation strategies, uation s and the design of fitness function for a number of improvements, etc., in view of the limitations of genetic algorithm, select the operation, cross-rate and mutation rate selection problem, steps made of genetic improvement, the use of the fitness ratio of law and the best combining individual preservation of choice, used in the optimization process to improve the adaptive adjustment of the cross-rate and mutation rate, reduced so that a local search the best possibility to improve the computational efficiency. Finally, the establishment of Reconstruction Recovery mathematical model in order to restore the maximum load as the objective function, the application of genetic algorithm search for the optimal solution, simulation results verify the effectiveness of the algorithm, and with distributed power grid after the impact of the analysis. Keywords distribution network; Recovery Reconstruction; genetic algorithm; back on behalf of the er ; flow calculation; distributed power 目 录 摘要I AbstractII 1引言1 1.1配电网特点1 1.2含分布式发电的配电网故障后的运行方式1 1.2.1 分布式发电与孤岛运行1 1.2.2 孤岛运行特征及其对稳定性的影响3 1.3配电网供电复原的意义3 1.4配电网供电复原的探讨与发展4 1.4.1常用的优化方法4 1.4.2 最优流模式算法4 1.4.3支路交换法5 1.4.4人工智能方法5 1.5本文的主要工作5 2 配电网的简化及潮流计算6 2.1配电网的变结构耗散模型6 2.1.1配电网的无向图描述6 2.1.2配电网的有向图描述7 2.2配电网的变结构网络模型7 2.2.1基形变换7