Direct-current power grid performance detection method and system based on virtual nodes
A DC power grid and virtual node technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of complex calculation of droop coefficient
Active Publication Date: 2021-05-18
ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER +1
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However, for a somewhat complex DC power grid topology, such as a mesh type, since there are no common actual nodes, the conductance matrix of the network has off-diagonal elements, and the calculation of the droop coefficient is more complicated
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[0060] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0061] The purpose of the present invention is to provide a method and system for detecting the performance of a DC power grid based on a virtual node, so as to realize the performance detection of a DC power grid without a common node based on the droop coefficient.
[0062] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further d...
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The invention discloses a direct-current power grid performance detection method and system based on virtual nodes. The method comprises the steps of obtaining impedance data of an actual direct-current power grid, and constructing an initial conductance matrix of the actualdirect-current power grid; combining actual nodes of which the voltage is equal to the average direct current side voltage of all actual nodes in the actual direct-current power grid into virtual nodes to obtain a reconstructed direct-current network; generating a conductance matrix of the reconstructed direct-current network as a reconstructed conductance matrix according to the initial conductance matrix; eliminating a branch which does not contain an actual node of which the voltage is equal to the voltage of the virtual node in the reconstructed direct-current network, and obtaining a simplified direct-current network; according to the reconstructed conductance matrix, generating a conductance matrix of the simplified direct-current network as a simplest conductance matrix; and calculating a droop coefficient of the direct-current power grid by using the simplest conductance matrix, and further determining the performance of the actual direct-current power grid. According to the invention, performance detection of the direct-current power grid without the common node based on the droop coefficient is realized.
Description
technical field [0001] The present invention relates to the technical field of DC power grid state detection, in particular to a virtual node-based DC power grid performance detection method and system. Background technique [0002] The droop coefficient is an important parameter to characterize the performance of the DC grid. If the droop coefficient is small, the dynamic response of the DC grid will be slow. If the droop coefficient is large, the frequency and voltage of the DC grid will vary widely, and the output of the DC grid will be unstable. [0003] For the radial DC grid topology, there is a common actual node in this topology. Therefore, the conductance matrix of the DC grid except the common actual node is a diagonal matrix, and the sag coefficient can be calculated through the diagonal elements of the conductance matrix. However, for a somewhat complex DC power grid topology, such as a mesh type, since there are no common actual nodes, there are off-diagonal ele...
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CPCG01R31/00Y02E60/60
Inventor 邵红博程昱明司瑞华张丽华王洋曹昕韩民晓李菡昊
Owner ECONOMIC TECH RES INST OF STATE GRID HENAN ELECTRIC POWER