Power flow calculation method for flexible interconnecting alternating current-direct current hybrid power distribution network

Abstract

The invention provides a power flow calculation method for a flexible interconnecting alternating current-direct current hybrid power distribution network. The power flow calculation method comprises the steps of A, establishing an alternating current power distribution system model and a direct current power distribution system model; B, disassembling the alternating current and direct current hybrid power distribution system; C, establishing a mathematical model for a power exchange interface between an alternating current sub network and a direct current sub network; D, carrying out power flow calculation on the alternating current sub network; E, carrying out power flow calculation on the direct current sub network; and F outputting the power flow calculation result. According to the technical scheme provided by the invention, the alternating current and direct current hybrid power distribution system is disassembled into the alternating current system and the direct current system; different power flow calculation methods are carried out on the alternating current system and the direct current system separately; and in addition, power exchange is only implemented on certain calculation nodes, so that the calculation speed is greatly enhanced.

Description

technical field [0001] The invention relates to a power flow calculation method for the operation of a distribution network, in particular to a power flow calculation method for a flexible interconnected AC-DC hybrid distribution network. Background technique [0002] The AC-DC hybrid distribution network can better accommodate distributed power sources and DC loads, alleviate the contradiction between limited corridors of urban power grid sites and high load density, and at the same time provide dynamic reactive power support at the load center and improve the security and stability of the system. In the AC-DC hybrid distribution network, the flexible DC technology changes the topology of the distribution network and improves the power flow control capability between sub-areas. However, the network and a large number of DC devices appearing in the AC-DC hybrid distribution system have greatly changed the grid structure and operation mode of the traditional AC distribution n...

AI Technical Summary

Problems solved by technology

In the engineering calculation of ultra-large-scale AC-DC hybrid distribution network, it is often encountered that the convergence of power flow calculation is difficult or even non-convergent, resulting in the inability to effectively obtain a feasible solution, which seriously restricts work efficiency and affects subsequent security and stability calculation analysis.

The existing power flow calculation methods for AC systems are relatively mature, but the convergence of power flow calculations for ultra-large-scale AC-DC hybrid distribution systems has always been difficult. At the same time, the power flow calculation algorithms for AC and DC networks are mainly concentrated in the field of transmission networks The structure and parameter asymmetry of the power network, the complexity of the network scale and other characteristics lead to the difference between the calculation method of AC and DC mixed power flow and the power flow calculation method in the transmission network.

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