计及多种分布式电源的配电网三相潮流问题研究

发布时间：2018-09-07 07:23

【摘要】：当今世界正面临着来自能源和环境的严峻挑战,探索新能源发电技术迫在眉睫,分布式电源因其诸多优点越来越受到全球电力领域专家的关注。分布式电源接入配电网给配电网的网络结构、功率损耗、电压分布带来了巨大影响。要对含有分布式电源的配电网做细致研究,必须以潮流计算为基础。因此,本文对含有分布式电源的配电网的三相潮流问题进行了深入的研究：1.研究和总结了分布式电源并网对配电网的影响,分析和比较了潮流、三相潮流的计算方法,拟定了以牛顿法计算三相潮流的核心思想；结合牛顿法三相潮流建立了配电网所含电气元件的三相相序模型,将多种分布式电源分为四种节点类型并给出了各节点类型的分布式电源在三相潮流计算中的处理方法。2.详细分析了牛顿法计算三相潮流的原理步骤,及其严重影响收敛性的初值敏感问题。针对该问题提出了牛顿类潮流计算收敛性定理,并给出了详细证明。该定理为潮流计算中所选初值是否合理有效提供了可靠依据,解决了用牛顿法进行潮流计算时因初值选取不当导致潮流收敛过慢或者无法收敛的问题。通过在IEEE标准节点测试系统的仿真及通辽电网的实例分析,验证了该定理的正确性。3.针对含有分布式电源的配电网多节点结构复杂的特点,及其所固有的初值选取难的问题,将牛顿法与遗传算法相结合提出了N-GA三相潮流计算方法。该方法利用遗传算法的全局寻优能力选取牛顿法潮流计算中的初值,解决了初值选取的盲目性问题。同时提出了牛顿类潮流计算迭代次数估计定理,给出了牛顿类潮流计算最大迭代次数估计算法,这就更大程度的提高了所选初值对潮流计算的合理性。选取IEEE33节点测试系统对N-GA算法进行了仿真分析,证明了系统三相平衡及不平衡时该方法的有效性、快速性和准确性。最后,总结了论文的主要研究结论和需要进一步深入研究的内容。
[Abstract]:Nowadays, the world is facing severe challenges from energy and environment. It is urgent to explore new energy generation technology. Distributed power generation (DG) has attracted more and more attention from global power experts because of its many advantages. The network structure, power loss and voltage distribution of the distribution network are greatly influenced by the access of the distributed power generation to the distribution network. In order to study the distribution network with distributed generation, it is necessary to base on power flow calculation. Therefore, in this paper, the three-phase power flow problem of distribution network with distributed generation is studied deeply. This paper studies and summarizes the influence of distributed power generation on distribution network, analyzes and compares the calculation methods of power flow and three-phase power flow, and formulates the core idea of calculating three-phase power flow by Newton method. Based on Newton's three-phase power flow, a three-phase sequence model of electrical components in distribution network is established. The distributed generation is divided into four node types and the processing method of each node type distributed power supply in three-phase power flow calculation is given. The principle and steps of calculating three-phase power flow by Newton method are analyzed in detail, and the initial value sensitivity problem which seriously affects convergence is analyzed in detail. A convergence theorem for Newtonian power flow calculation is presented and proved in detail. This theorem provides a reliable basis for whether the initial value selected in power flow calculation is reasonable and effective, and solves the problem that the power flow convergence is too slow or unable to converge due to improper selection of initial value in power flow calculation by Newton method. The correctness of the theorem is verified by the simulation of the IEEE standard node test system and the analysis of the Tongliao power network. In view of the complex structure of multi-nodes in distribution network with distributed generation and the inherent difficulty in selecting the initial value, a three-phase power flow calculation method for N-GA is proposed by combining Newton method with genetic algorithm. In this method, the global optimization ability of genetic algorithm is used to select the initial value in power flow calculation of Newton method, and the blind problem of initial value selection is solved. At the same time, the iterative degree estimation theorem for Newtonian power flow calculation is proposed, and the algorithm for estimating the maximum iterative degree of Newton power flow calculation is given, which improves the rationality of the selected initial value to the power flow calculation to a greater extent. The IEEE33 node test system is selected to simulate and analyze the N-GA algorithm, which proves the effectiveness, rapidity and accuracy of the method when the system is balanced and unbalanced. Finally, the paper summarizes the main research conclusions and needs further research.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744

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