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A Matlab-Based Polar Coordinate Newton Method Power Flow Calculation Method

A technology of power flow calculation and polar coordinates, applied in the direction of calculation, AC network with the same frequency of different sources, instruments, etc., can solve the problems of underutilization and slow calculation speed.

Inactive Publication Date: 2018-10-30
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

This method is very fast when implemented in a compiled programming language such as C language, but the calculation speed is very slow when implemented in an interpreted programming language such as Matlab. At the same time, this patent does not make full use of the characteristics of Matlab that is good at matrix operations and complex number operations.

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  • A Matlab-Based Polar Coordinate Newton Method Power Flow Calculation Method
  • A Matlab-Based Polar Coordinate Newton Method Power Flow Calculation Method
  • A Matlab-Based Polar Coordinate Newton Method Power Flow Calculation Method

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Embodiment Construction

[0137] Below in conjunction with accompanying drawing, the present invention is further described, according to Figure 3-4 The flow shown is calculated for a modified 445-node actual system example.

[0138] 445 nodes The actual large-scale power system has 445 nodes and 544 branches, including a large number of small impedance branches. In order to compare various methods, these small impedance branches are changed to normal impedance branches to meet the requirements of various methods.

[0139] The calculation example of the 445-node actual system is calculated by using the present invention and several comparison methods, and the convergence precision is 0.00001 during the calculation. Several power flow calculation algorithms are:

[0140] Method 1: the method of Chinese patent ZL201010509556.5, which is realized by Matlab language.

[0141] Method 2: The Chinese patent ZL201010509556.5 method is implemented in Matlab language, but the equation solving algorithm direc...

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Abstract

The invention discloses a polar coordinate Newton method load flow calculation method based on Matlab. By means of matrix operation and complex operation, a jacobian matrix is formed and node power is calculated according to the programming features of Matlab, and the method includes the following steps of calculating a jacobian initial calculation matrix, calculating node complex power, calculating an initial jacobian matrix block sub-matrix, modifying diagonal elements of the jacobian matrix block sub-matrix through the node complex power, forming the jacobian matrix through the jacobian matrix block sub-matrix, and adjusting the jacobian matrix. The method is implemented on a Matlab platform, and scientific researchers can test and analyze the calculation result by conveniently using various tools and functions provided by Matlab. It is proved through practices that the scientific researchers conveniently write, modify and adjust a program, the calculation speed is basically close to the speed achieved on a C language platform, and an excellent analysis tool is provided for the scientific research of the scientific researchers.

Description

technical field [0001] The invention relates to a power system Newton method power flow calculation method, in particular to a polar coordinate Newton method power flow calculation method suitable for research purposes. Background technique [0002] Power system power flow calculation is a basic calculation for studying the steady-state operation of the power system. It determines the operating state of the entire network according to the given operating conditions and network structure. The power flow calculation is also the basis of other analysis of the power system, such as safety analysis, transient stability analysis, etc., all use power flow calculation. Polar coordinate Newton method power flow calculation method is the most commonly used power flow calculation method, and researchers often conduct further research on the basis of polar coordinate Newton method power flow calculation. Practical commercial software employs advanced techniques such as sparse matrix te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06G06F17/50
CPCG06F30/398H02J3/06Y02E60/00
Inventor 姚玉斌曹井川王丹
Owner DALIAN MARITIME UNIVERSITY
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