【作者】 李源；

【导师】 李林川；

【作者基本信息】 天津大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 配电网络重构是提高配网经济性和可靠性的重要手段,是配电管理系统的重要组成部分。在理论上,配电网络重构是一个复杂的非线性组合优化问题,传统的数学优化方法在处理此类问题时有很大的局限性。本文建立了一种考虑多种负荷方式的配电网络重构模型,通过多种负荷方式模拟负荷的变化,综合考虑多种负荷方式下的网损,从而实现一段时间内的配电网络重构,使得重构结果更接近该时间段内配电网络的实际最优运行结构,有效地解决了静态重构模型不能反应负荷变化和动态重构模型需要频繁进行开关操作的缺点。在算法上,本文采用二进制粒子群优化算法解决配电网络重构问题。引入动态惯性权重调整策略,能更有效地利用种群进化信息,提高了算法的收敛速度和精度。同时,根据配电网络结构的特点,采用了基于环路开关集的编码方式,有效地降低了不可行解产生的概率。在此基础上,本文提出了基于二进制粒子群优化考虑多种负荷方式的配电网络重构算法。针对重构过程中网络结构变化较大的问题,本文提出了一种简单易行的配电网络辐射状判别方法,并对一种基于支路电流和节点电压的配电网络潮流算法进行了改进,使得算法的通用性得到很大提高。通过IEEE-16节点和IEEE-33节点两个典型配电网络重构算例的验证,表明本文提出的算法能够有效地解决配电网络重构问题,收敛性好,实际效果较好。更多还原

【Abstract】 Distribution network reconfiguration is an important method for operationoptimization and network reliability, and plays an important part in DistributionManagement System. In theory, network reconfiguration is a complicated problem ofnonlinear combinational optimization. The traditional mathematical optimizationmethods have great limitations in dealing with such issues.A model considering multi-load mode for distribution network reconfiguration ispresented in this paper, which can simulate the variation of load with multi-load mode.It can achieve network reconfiguration for a period of time, and is closer to the actualoptimal operation. Also, this model can solve the limitation of the staticreconfiguration model which can’t reflect the variation of load and the defect of thedynamic reconfiguration model which requires frequent operation on switchesBinary Particle Swarm Optimization (BPSO) is applied to solve the problem ofdistribution network reconfiguration in this paper. Dynamic inertia weight adaptationstrategy is introduced for BPSO, which uses the evolution information of thepopulation and can improve velocity and precision of convergence. Also, an improvedencoding mode based on switches of loops of network is introduced according to thecharacteristics of distribution network, which can reduce the probability of infeasiblesolutions. And based on these, a method based on improved BPSO for distributionnetwork reconfiguration considering multi-load mode is presented in this paper.A simple method for identifying radial structures of distribution network isapplied in reconfiguration, and an improved algorithm based on branch current andnode voltage for power flow calculation of distribution network is presented in thispaper, which can be applied to network of variational structure.The results of two testing systems of distribution network justify that the methodproposed in this paper can solve the problem of distribution network reconfigurationefficiently, which has better convergent performance and can get better result.更多还原