Global Linear Eccentricity Method Based on Equivalent Conductance Compensation for Acquiring DC Power Network Power Flow

Abstract

An equivalent conductance-compensated global linear eccentricity 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 reference node number, establish the equal conductance compensation type global linear eccentric model (102) of the power flow in the DC power network; then according to the equivalent conductance compensation type global linear eccentricity model , to establish the equivalent conductance-compensated global linear eccentricity matrix relational expression (103) of the non-reference node translation voltage with respect to the non-reference node injection power; finally, according to the equivalent conductance-compensated global linear eccentricity matrix relation and the reference node translational voltage value, calculate The voltage value of each node in the DC power network and the transmission power value of each branch (104); the calculation amount is small, there is no convergence problem, and the accuracy is high 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 eccentricity 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...

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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