Load flow calculation method and device for large-scale power distribution network

Abstract

The embodiment of the invention provides a load flow calculation method and device for a large-scale power distribution network, and the method comprises the steps: decomposing a target power distribution network into a plurality of sub-networks, and obtaining an equation for solving a contact branch current value between the sub-networks; calculating constant impedance, constant current and constant power parameters of each subnet ZIP load model; calculating a node admittance matrix of each subnet according to the constant impedance parameters, and improving the node admittance matrix; calculating the node injection current of the current iteration according to the node voltage of the current iteration and the constant current and constant power parameters; obtaining the current iterationcontact branch current according to the improved node admittance matrix, the current iteration node injection current and an equation used for solving the contact branch current between the subnets;obtaining the node voltage phasor of the next iteration according to the contact branch current of the current iteration if the difference value between the contact branch current of the previous iteration and the next iteration is greater than the convergence criterion. According to the embodiment of the invention, the efficiency and flexibility of load flow parallel computing are considered.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power system analysis and calculation, and more specifically, to a method and device for calculating power flow in a large-scale distribution network. Background technique [0002] With the continuous improvement of the automation level of the power system, the distribution system, as an important part of the power network, has been paid more and more attention in the power system, especially in the calculation of the power flow of the distribution network in the optimization of the distribution network. With the massive access of distributed power sources, electric vehicles and other equipment, the distribution network has gradually changed from a traditional passive network to an active active distribution network with a more complex structure. Requirements for real-time calculation of distribution network. Therefore, it has become the key to study large-scale power distribution s...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low efficiency of parallel computing and poor flexibility of sub-network solution existing in the prior art, the embodiment of the present invention provides a large-scale distribution network power flow calculation method and device

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