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Power system load flow calculation method based on hot start and quasi-Newton method

A technology of power system and power flow calculation, applied in the field of power system

Active Publication Date: 2020-09-22
NORTHEASTERN UNIV
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Problems solved by technology

Among them, interval analysis has been successfully used to solve linear problems, but the power system power flow model is a large nonlinear system, so there are still many shortcomings in using it for power flow analysis research

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  • Power system load flow calculation method based on hot start and quasi-Newton method
  • Power system load flow calculation method based on hot start and quasi-Newton method
  • Power system load flow calculation method based on hot start and quasi-Newton method

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Embodiment Construction

[0060] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0061] This embodiment adopts the power system power flow calculation method based on hot start and quasi-Newton method of the present invention to perform power flow calculation on the IEEE14 node system, IEEE30 node system, IEEE118 node system, and IEEE145 node system. The processor of the computer used for power flow calculation in this embodiment is intel(R) Core(TM) i7-7700HQ CPU@2.80GHz2.81GHz, the RAM is 8GB, and the operating system is MATLAB R2019b.

[0062] In this embodiment, the IEEE14 node system includes 5 generators and 20 branches, the total installed capacity is 772.4MW, and the total load is 259MW; the IEEE30 node system is as follows figure 1 As shown, ...

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Abstract

The invention provides an electric power system load flow calculation method based on hot start and a quasi-Newton method and relates to the technical field of electric power systems. The method comprises the following steps of firstly, establishing a linear power balance equation of a power system according to the structure and parameters of the power system, and obtaining an initial solution ofa bus node voltage; then determining a coefficient matrix M of quasi-Newtonian load flow calculation, and replacing inverse of a jacobian matrix in an iterative matrix equation of load flow calculation by using M to carry out power system load flow iterative calculation; introducing a relaxation factor into the coefficient matrix M, and searching an optimal value of the relaxation factor by utilizing a genetic algorithm; finally, calculating an initial coefficient matrix M0 according to the initial solution of the bus node voltage and the optimal value of the relaxation factor; and utilizing acoefficient matrix M to replace the inverse of the jacobian matrix in the iterative matrix equation of the Newton-Raphson method to carry out load flow calculation, carrying out load flow calculation, obtaining the voltage amplitude and a phase angle of a bus node of a power system, and obtaining the transmission power of each line.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a power system power flow calculation method based on hot start and quasi-Newton method. Background technique [0002] Power flow calculation is an initial calculation method to maintain the normal operation of the power system, and it is the beginning of research on power system optimization, planning, voltage stability and other topics. Power flow analysis is based on the power balance equation of the power system, which can be solved using numerical techniques such as Gauss-Seidel, Newton-Raphson, and their variants. However, with the continuous expansion of the scale and complexity of modern power grids, especially the closer connection between renewable energy and microgrids and traditional power grids, it is often difficult to ensure reliable convergence based on traditional cow-pulling methods, and fast The accuracy of the decoupled power flow algorithm is difficult...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 王占山刘明凯杨东升万富康
Owner NORTHEASTERN UNIV
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