A method for calculating power flow of distribution network
A technology of power flow calculation and distribution network, applied in the field of power system, can solve the problem of node number layering, etc., and achieve the effect of high result accuracy and fast convergence speed.
Inactive Publication Date: 2018-12-18
ZHEJIANG UNIV CITY COLLEGE
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[0008] The invention provides a power flow calculation method, which is simple and convenient, has fast convergence speed and high accuracy of results, so as to solve the difficulties of node numbering layering and loop processing existing in the traditional power flow calculation method
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0047] The invention provides a power flow calculation method, which is simple and convenient, has fast convergence speed and high result accuracy, and solves the difficulties such as node number layering and loop processing existing in the traditional power flow calculation method. It mainly includes the following steps:
[0048] S1: For a given distribution network, determine the number of nodes in the grid as n and the number of branches as m, and abstract ...
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A method for calculating power flow of a distribution network comprises the following steps: S1, arbitrarily numbering nodes of the distribution network; using an n * m correlation matrix to representH for the distribution network structure based on a graph theory method, wherein n is the number of nodes of the distribution network and m is the number of branches of the distribution network; S2,establishing the relationship among the node current vector, the node voltage vector, the branch current vector, the branch voltage vector, the impedance matrix and the correlation matrix; 3, removingthe node current vector, the node voltage vector and the row of the feeder node in the correlation matrix, and constructing a power flow equation; and S4, setting the initial value for iteration until convergence to obtain a power flow solution. The calculation method of the invention does not need to process the affine distribution network and the Meshed distribution network separately, can carry out arbitrary numbering on the nodes in the distribution network, and does not need to sequentially number and stratify the nodes, so that the method is simple and convenient, the convergence speedis fast, and the result accuracy is high.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a method for calculating power flow of a power distribution network. Background technique [0002] Power system power flow calculation is one of the most basic problems in power system stability analysis, and its task is to calculate the power flow distribution of a given network. [0003] The power flow calculation of the distribution network is widely used in the planning and transformation of the power grid, fault diagnosis, network reconfiguration and so on. With the continuous development of microgrid, a fast and general power flow calculation method is more needed in power grid analysis. [0004] The distribution network has the characteristics of 1) affine / Meshed structure; 2) the impedance ratio is higher than R / X; 3) the number of branches and nodes is large, so when the traditional power flow calculation method of the transmission network such as: Gauss-Seidel iteration me...
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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 李艳君沈弢潘树文
Owner ZHEJIANG UNIV CITY COLLEGE