A Global Linear Symmetry Method Based on Equivalent Conductance Compensation for Obtaining Power Flows in DC Power Networks

Abstract

An equivalent conductance-compensated global linear symmetric method for obtaining DC power grid flow. Firstly, an equivalent conductance-compensated global linear relationship between node injection power and node translational voltage is established based on the node load parameters and node power parameters in the DC power network. (101); then according to the equivalent conductance compensation type global linear relational formula and the power balance node number, establish the equivalent conductance compensation type global linear symmetry model (102) of the power flow in the DC power network; then according to the equal amount conductance compensation type global linear symmetry Model, using the M-P inverse matrix to establish the equivalent conductance compensation type global linear symmetric matrix relation (103) of the whole network node translation voltage with respect to the non-power balanced node injection power; finally according to the equivalent conductance compensation type global linear symmetric matrix relation , calculating the voltage value of each node in the DC power network and the transmission power value of each branch (104). This method has a small amount of calculation, no convergence problem, and high precision when the operating state of the DC power network changes in a large range.

Description

technical field [0001] The invention relates to the field of electric power engineering, in particular to an equal conductance compensation type global linear symmetry method for obtaining the flow of a DC power network. Background technique [0002] At present, the technical and economic advantages of DC transmission are rapidly promoting the construction and development of DC power grids. The power flow acquisition method as the basis of DC power grid regulation, especially the fast, reliable and accurate global linear power flow model and calculation method, needs to be developed urgently. [0003] The existing DC power network power flow acquisition method is to first establish a nonlinear node power balance equation model, and then use an iterative method to solve it. Due to the nonlinearity of the model of node power balance equations, this method not only has a large amount of iterative calculation and is slow in speed, but also has the problem of non-convergence or ...

AI Technical Summary

Problems solved by technology

If the local linear power flow model based on the linearization of the operating base point is used, it cannot meet the accuracy requirements for regulation when the operating state of the DC power grid changes in a large range

Therefore, the existing DC power grid power flow acquisition methods either have slow calculation speed and unreliable convergence problems, or are not suitable for large-scale changes in the operating status of DC power grids.

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