Hierarchical impedance analysis method for medium-voltage and low-voltage hybrid distribution network
A distribution network, hierarchical technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of huge node branch volume, limited analysis range, no power flow analysis, etc., to ensure safe and reliable operation Data foundation, the effect of improving efficiency
Active Publication Date: 2019-03-19
STATE GRID ANHUI ELECTRIC POWER +3
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Problems solved by technology
Due to the complex topological structure of the distribution network and the huge number of node branches, distribution automation collection and control points are limited. In the distribution network analysis, the first is to perform line loss, three-phase balance, and load transfer based on the supply-demand balance relationship of key nodes. Analysis, no accurate power flow analysis; second, the scope of analysis is limited to the medium voltage power grid above 10kV
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[0052] refer to figure 1, the method of the present invention includes two parts of model building and model solving. The analysis object of the present invention is a medium-low voltage hybrid distribution network, which includes both a 10kV or 22kV medium-voltage distribution network and a 400V low-voltage distribution network. In order to simplify the construction of the mathematical model and improve the optimization solution efficiency, the present invention divides the medium and low voltage hybrid distribution network into medium voltage distribution network, low voltage distribution network and household network, and analyzes the root nodes, stems and Nodes and leaf nodes, the starting node of each level of distribution network is used as the root node, the intermediate transition node is used as the stem node, and the end node is used as the leaf node. Specifically, refer to figure 2 and image 3 Example circuit topology shown:
[0053] The medium-voltage distribu...
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The invention discloses a hierarchical impedance analysis method for a medium-voltage and low-voltage hybrid distribution network, which can be used for operation analysis of a distribution network. The method comprises firstly introducing a hierarchical division method into the medium-voltage and low-voltage hybrid distribution network, and dividing the distribution network into a medium-voltagedistribution network, a low-voltage distribution network and a household grid; then analyzing the root nodes, the leaf nodes and the stem nodes of the distribution networks in various levels; establishing an equivalent circuit model and mathematical models of the distribution networks in respective levels; solving the models by a multiple linear regression method, and solving the local optimization of distribution networks in respective levels to obtain an initial impedance value; obtaining a global equation by the simultaneous equations of the networks in respective levels and constructing aglobal residual sum of square equation; solving the least squares with the minimum residual sum of square as a target, so as to obtain the impedance values of various lines in the medium-voltage and low-voltage hybrid distribution network. The method can improve the efficiency of impedance analysis, provides a reliable data foundation for network analysis and regulation of the distribution network, and ensures the safe operation of the power grid.
Description
technical field [0001] The invention relates to the technical field of distribution network operation analysis, in particular to a hierarchical impedance analysis method for medium and low voltage hybrid distribution networks. Background technique [0002] With the advancement of smart grid construction, the current situation of "heavy transmission and light distribution" in my country's power grid construction has gradually changed, and the goal of full coverage construction of distribution automation systems and power information collection systems has rapidly improved the status quo of my country's power distribution construction. . Distribution automation realizes automatic monitoring of distribution network operation through telemetry, remote signaling and remote control of control nodes such as transformers, switching stations, and ring network cabinets in 10kV and above distribution networks, and improves the reliability and economy of distribution network operations. ...
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Login to View More IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 张波赵永红肖坚红唐亮疏奇奇梁晓伟张良周宇孙筵翔陶晓峰吕朋朋周永真许少哲黄时
Owner STATE GRID ANHUI ELECTRIC POWER