Rapid load flow calculation method and device for power distribution network under power system

Abstract

The invention discloses a rapid load flow calculation method and device for a power distribution network under a power system, and the method comprises the following steps: S1, generating a wiring diagram of the power distribution network, and obtaining a wiring mode of the power distribution network; s2, acquiring parameters and operating conditions of the power distribution network for load flow calculation; s3, performing rapid load flow calculation on the power distribution network by matching different load flow calculation methods according to the obtained wiring mode of the power distribution network, the parameters of the power distribution network and the operating conditions of the power distribution network; s4, displaying a calculation result through a display; and S5, carrying out reliability evaluation on the power distribution network. According to the method, drawing work such as manual placement of graphic elements on the diagram and drawing of connecting lines is not needed, the wiring diagram of the power distribution network can be automatically generated, so that the time for generating the wiring diagram is shortened, the wiring mode of the power distribution network can be obtained more quickly, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power flow calculation, and in particular relates to a method and device for fast power flow calculation of a distribution network under a power system. Background technique [0002] Power flow calculation is a term in electric power, which refers to the calculation of the distribution of active power, reactive power and voltage in the power grid under the given power system network topology, component parameters and power generation and load parameters. The power flow calculation is to determine the steady-state operating state parameters of each part of the power system according to the given grid structure, parameters and the operating conditions of generators, loads and other components. Usually the given operating conditions are the power of each power source and load point in the system, the voltage of the pivot point, the voltage of the balance point and the phase angle. The operating state parame...

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Problems solved by technology

The operating state parameters to be obtained include the voltage amplitude and phase angle of each bus node of the power grid, the power distribution of each branch, and the power loss of the network. However, various power flow calculation methods on the market still have various problems

[0003] For example, the authorized announcement number is CN110417021A, which discloses a method for calculating the three-phase power flow of distribution network based on the quick extraction of Jacobian elements. Matlab has rich functions and is good at matrix operations to form the effective row label array of Jacobian matrix and the effective Column label array, use Matlab's any function to judge whether there are non-zero elements in each row or column of the Jacobian matrix J, and the judgment results form arrays R and C, and then use Matlab's find function to find the position of the non-zero elements in array R and array C , and then form the effective row label array JR and the effective column array JC of the Jacobian matrix. Since Matlab's built-in functions and matrix operations are very fast, compared with the traditional loop method or logic function method, it greatly shortens the formation of the Jacobian matrix effective row. The time of the array and the effective column array improves the calculation speed and simplifies the programming, but it does not solve the existing problems of the existing fast power flow calculation method for the distribution network: it is inconvenient for the wiring diagram of the automatic distribution network and reduces the The speed of generating wiring diagrams increases time consumption, thereby reducing work efficiency. In addition, it is inconvenient to evaluate the reliability of the distribution network

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