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Calculation method of power system power flow based on hot start and quasi-Newton method

A technology of power system and power flow calculation, applied in the field of power system, to achieve the effects of improving control efficiency and practicability, increasing calculation speed, and improving calculation accuracy

Active Publication Date: 2021-11-05
NORTHEASTERN UNIV LIAONING
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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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  • Calculation method of power system power flow based on hot start and quasi-Newton method
  • Calculation method of power system power flow based on hot start and quasi-Newton method
  • Calculation method of power system power flow 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 a power system power flow calculation method based on hot start and quasi-Newton method, and relates to the technical field of power systems. This method first establishes the linear power balance equation of the power system according to the structure and parameters of the power system, and obtains the initial solution of the bus node voltage from it; then determines the coefficient matrix M of the quasi-Newton power flow calculation, and uses M instead of the Newton method for power flow calculation The inverse of the Jacobian matrix in the iterative matrix equation is used to iteratively calculate the power system power flow; at the same time, the relaxation factor is introduced into the coefficient matrix M, and the optimal value of the relaxation factor is found by using the genetic algorithm; finally, according to the initial solution of the bus node voltage and the relaxation factor The optimal value calculation initial coefficient matrix M 0 , and use the coefficient matrix M to replace the inverse of the Jacobian matrix in the iterative matrix equation of the power flow calculation, iteratively carry out the power flow calculation, and obtain the voltage amplitude and phase angle of the bus node of the power system, and then obtain the transmission of each line power.

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...

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Application Information

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Patent Type & Authority Patents(China)
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 LIAONING
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