不对称网络的节点导纳矩阵及潮流的非膨胀算法

发布时间：2018-03-08 12:08

本文选题：节点电压法　切入点：不动点非膨胀算法　出处：《广西大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着现代电网的不断发展,特别是智能电网的提出,使得配电网的重要性越来越突出。对于发电和输电而言,配电网络是保障供电可靠性、安全性的最主要环节,也是落实智能电网的核心环节。由于电力电子元件在配网中的应用、元件参数的不对称、用电负荷的多样性所造成的三相负荷不对称、分布式电源的接入及系统运行条件改变所引起的不对称等,以上这些因素使得配电网的不平衡问题越来越突出。与三相对称系统相比较,三相不对称配电网络分析须进一步解决的核心问题是,三相负荷不对称、三相线路参数不对称问题和配电网络PQ负荷的潮流迭代算法问题。为解决线路参数不对称问题,本文将三相互感耦合及参数不对称的线路进行去互感处理,将线路等值为三相网形电路,使三相不对称网络分析计算可延续较成熟的对称电路分析的节点电压法。相分量模型能够反映系统实际运行的物理特性,能够简明、直观、准确地描述配电网的运行状况,对配电网进行计算与分析不需要像对称分量法那样严格的条件限制。其次,针对配电网络中重PQ负荷点、缺少PV节点的电压支撑的具体特点,提出了一种不动点非膨胀迭代算法,该算法采用节点负荷等值导纳逐次逼近的方式可较好解决PQ负荷点多的辐射梳状配电网高精度潮流的快速迭代问题,并从求解非线性方程组数学角度对本文算法的非膨胀特性进行数学论证,最后采用IEEE33节点、IEEE IEEE123节点配电系统进行仿真,其仿真结果也验证了算法的超线性收敛、非膨胀特性理论分析的正确性及算法在配电网潮流计算中的可行性。随着能源危机和环境问题的加剧,新能源越来越受到重视,与之相对应的分布式发电技术成为未来配电网的发展趋势。随着社会经济的发展,传统的集中式供电模式的缺陷越来越突出,已无法满足当前电力供应的需求。分布式电源的接入给传统配电网注入活力,但同时也对配电网提出了新的挑战。分布式电源的接入改变了配电网原有的结构和运行方式。传统的配电网潮流计算方法已经无法满足含分布式电源的配电网潮流计算。本文对接入配电网的分布式电源模型进行研究,将提出的不动点非膨胀潮流算法推广到含分布式电源的配电网潮流计算。对IEEE33节点的弱环配电网络网络及辐射状网络进行仿真,其仿真结果验证本文算法在含分布式电源配电网络潮流计算中的适用性
[Abstract]:With the continuous development of modern power grid, especially the proposal of smart grid, the importance of distribution network is more and more prominent. For power generation and transmission, distribution network is the most important link to ensure the reliability and security of power supply. Because of the application of power electronic components in distribution network, the asymmetry of component parameters and the diversity of power load, the three-phase load is asymmetric. The imbalance problem of distribution network becomes more and more serious because of the asymmetry caused by the access of distributed generation and the change of system operating conditions, which is compared with the three-phase symmetric system. The key problems to be solved in the analysis of three-phase asymmetrical distribution network are three-phase load asymmetry, three-phase line parameter asymmetry and power flow iterative algorithm for distribution network PQ load. In this paper, the circuit with three-phase mutual inductance coupling and parameter asymmetry is treated with de-inductance, and the circuit is equivalent to three-phase network circuit. The phase component model can reflect the physical characteristics of the actual operation of the system, and it can describe the distribution network operation state succinctly, intuitively and accurately. The calculation and analysis of distribution network need not be as strict as the symmetrical component method. Secondly, considering the specific characteristics of heavy PQ load point in distribution network, the voltage support of PV node is lacking. In this paper, a fixed point nonexpansive iterative algorithm is proposed. The fast iterative problem of high precision power flow in the radiation comb distribution network with multiple PQ load points can be solved by the successive approximation of nodal load equivalent admittance. The non-expansion characteristic of the algorithm is proved from the point of view of solving the nonlinear equations. Finally, the IEEE33 node / IEEEIEEE-based distribution system is simulated. The simulation results also verify the superlinear convergence of the algorithm. The correctness of the theoretical analysis of non-expansion characteristics and the feasibility of the algorithm in power flow calculation of distribution network. With the intensification of energy crisis and environmental problems, more and more attention has been paid to new energy. With the development of society and economy, the defects of traditional centralized power supply mode become more and more serious. Can no longer meet the current demand for power supply. Access to distributed power supply reinvigorates the traditional distribution network. But it also poses a new challenge to the distribution network. The access of distributed generation has changed the original structure and operation mode of the distribution network. The traditional power flow calculation method of distribution network can no longer meet the tide of distribution network with distributed generation. In this paper, the distributed power generation model connected to the distribution network is studied. The proposed fixed point non-expansion power flow algorithm is extended to the power flow calculation of distribution network with distributed power supply. The weak loop distribution network and radiation network of IEEE33 node are simulated. The simulation results verify the applicability of the proposed algorithm in the power flow calculation of distribution networks with distributed power sources.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM744

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