配电网潮流计算与重构方法的研究

发布时间：2019-04-18 22:14

【摘要】：近几年来，我国大力发展智能电网，这对于优化资源配置、提高供电可靠性、节能环保有着重要意义。配电网自动化是智能电网建设的关键环节，准确、快速的潮流计算为配电网的分析提供依据，网络重构则可以实现配电网的经济优化运行。本文围绕配电网三相潮流计算、经济性重构，以及分布式电源接入后的配电网潮流计算和网络重构等问题展开研究。首先，针对配电网三相不对称、网络规模大等特点，研究了大规模配电网的三相潮流计算方法。建立了配电网馈线、变压器和负荷的三相数学模型，讨论了常用的配电网潮流计算算法；针对已有的各类潮流算法在计算大规模配电网潮流上的缺陷，将求解大规模稀疏线性方程组的共轭梯度平方(Conjugate GradientSquare，CGS)迭代法引入到潮流计算当中，通过对线性方程组迭代方式的优化，提出了一种结合Jacobi预处理的CGS三相潮流算法。4个不同规模IEEE算例的仿真结果证明，该算法具有较好的收敛性和优良的求解速度，适合于计算大规模配电网潮流。其次，将生物学上的人工培植杂交方法引入配电网重构。详细介绍了人工培植杂交方法的原理和配电网支路的分类方法，阐述了重构过程中的染色体编码方式和物种染色体初始化过程、物种变异过程和物种杂交过程，针对在变异和杂交过程中产生少量不可行解的问题提出了修复方法，并提出了基于人工培植杂交的配电网重构算法，IEEE33节点和IEEE69节点仿真算例结果表明该重构算法具有较好的鲁棒性和快速的收敛性。最后，研究含分布式电源的配电网潮流计算和网络重构方法。介绍了几类分布式电源，讨论了分布式电源在配电网潮流计算和配电网重构中的节点类型转换处理方式，给出了在处理含分布式电源的配电网潮流计算和重构的流程，，进行了潮流计算和网络重构算例的仿真和分析，验证了所提算法在含分布式电源配电网中的适用性。
[Abstract]:In recent years, the development of smart grid in China is of great significance for optimizing the allocation of resources, improving the reliability of power supply, and saving energy and environmental protection. Distribution network automation is the key link of smart grid construction. Accurate and fast power flow calculation provides the basis for distribution network analysis and network reconfiguration can realize the economic optimization operation of distribution network. This paper focuses on three-phase power flow calculation of distribution network, economic reconfiguration, distribution network power flow calculation and network reconfiguration after distributed power supply access. Firstly, the calculation method of three-phase power flow in large-scale distribution network is studied according to the characteristics of three-phase asymmetry and large-scale distribution network. The three-phase mathematical models of feeder, transformer and load in distribution network are established, and the common calculation algorithms of power flow in distribution network are discussed. The conjugate gradient square (Conjugate GradientSquare,CGS) iterative method for solving large-scale sparse linear equations is introduced into the power flow calculation for large-scale power flow calculation, aiming at the shortcomings of the existing power flow algorithms in large-scale distribution network power flow calculation. By optimizing the iterative mode of linear equations, a three-phase power flow algorithm based on Jacobi pretreatment is proposed. The simulation results of four different scale IEEE examples show that the proposed algorithm has good convergence and excellent solution speed. It is suitable for calculating the power flow of large-scale distribution network. Secondly, the hybrid method of artificial cultivation in biology is introduced into distribution network reconfiguration. In this paper, the principle of artificial culture hybridization method and the classification method of distribution network branch are introduced in detail. The chromosome coding method, the initialization process of species chromosome, the process of species variation and the process of species hybridization in the process of reconstruction are described in detail. In order to solve the problem of producing a small number of infeasible solutions in the process of mutation and hybridization, a repair method is proposed, and an algorithm of distribution network reconfiguration based on artificial cultivation hybridization is proposed. The simulation results of IEEE33 node and IEEE69 node show that the reconstruction algorithm has good robustness and fast convergence. Finally, the power flow calculation and network reconfiguration of distribution network with distributed power supply are studied. This paper introduces several kinds of distributed power supply, discusses the node type conversion processing mode of distributed power supply in distribution network power flow calculation and distribution network reconfiguration, and gives the flow chart of power flow calculation and reconfiguration of distribution network with distributed power supply in the process of processing power flow calculation and reconfiguration of distribution network with distributed power supply. Simulation and analysis of power flow calculation and network reconfiguration examples are carried out to verify the applicability of the proposed algorithm in distribution networks with distributed power sources.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744

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