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Polar coordinate Newton method load flow calculation method suitable for research purpose

A power flow calculation and polar coordinate technology, which is applied to AC networks with the same frequency from different sources, complex mathematical operations, AC network circuits, etc. It can solve problems such as linear equations and solve functions that cannot be performed well, and improve program stability. , the effect of simplifying the corresponding relationship and increasing the amount of calculation

Pending Publication Date: 2022-05-31
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0053] Although the method of Chinese patent CN201010509556.5 simplifies the corresponding relationship between the nodes and the rows and columns of the equation coefficient matrix, and greatly reduces the difficulty of programming, it requires special treatment when solving the correction equation for power flow calculation, and cannot use the excellent linear equation provided by the programming language solve function

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  • Polar coordinate Newton method load flow calculation method suitable for research purpose
  • Polar coordinate Newton method load flow calculation method suitable for research purpose
  • Polar coordinate Newton method load flow calculation method suitable for research purpose

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Embodiment Construction

[0113] The present invention is further described below in conjunction with the accompanying drawings. according to Figure 1 The flowchart of the polar coordinates of the Newtonian method power flow calculation is shown and Figure 2 The flow block diagram of the Jacobian matrix of the present invention shown, a power flow calculation is performed on an actual large power grid. The actual large-scale grid has 445 nodes and contains a large number of small impedance branches, and in order to make the conventional power flow calculation method can also be calculated, these small impedance branches are changed to normal branches. The convergence accuracy of the power flow calculation is 0.00001.

[0114] For comparison, the power flow calculation of the actual large power grid was performed using the following three methods:

[0115] Conventional method: conventional polar coordinate Newton method power flow calculation method;

[0116] Patent method: Patent CN201010509556.5 method;

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Abstract

The invention discloses a polar coordinate Newton method load flow calculation method suitable for research purposes, and provides a Newton method load flow calculation method which is easy to modify and maintain for researchers performing further research on the basis of polar coordinate Newton method load flow calculation. For a power system with n nodes, node numbers are irrelevant to node types, a Jacobian matrix for load flow calculation is stored according to (2n) * (2n), elements of rows corresponding to delta Q and columns corresponding to delta U of PV nodes are 0, elements of rows and columns related to balance nodes are 0, but diagonal elements are not reset, and original calculation values are reserved. Therefore, a linear equation solving function with excellent performance provided by a programming language can be used for solving a correction equation for load flow calculation, the programming difficulty is reduced, the calculation speed is improved, and the reliability of the algorithm is ensured. Implementation examples show that the correction equation can be solved by using a linear equation solving function provided by a programming language, the load flow calculation speed is increased, and the programming difficulty is reduced.

Description

Technical field [0001] The present invention relates to a power system Newton method power flow calculation method, in particular a polar coordinate Newton method power flow calculation method suitable for research purposes. Background [0002] Power system power flow calculation is a basic calculation to study the steady-state operation of the power system, which determines the operating state of the entire power system according to the given operating conditions and network structure of the power system. Power flow calculation is also the basis for other analysis of power systems, such as safety analysis, transient stability analysis, etc. Power flow calculation is used. Due to its reliable convergence, fast computing speed and moderate memory requirements, Newton's method has become the mainstream method of current trend computing. Newton's method is divided into polar coordinates and Cartesian coordinates, and both forms of Newtonian power flow calculation have been widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06G06F17/16G06F17/11
CPCH02J3/06G06F17/16G06F17/11H02J2203/10H02J2203/20Y04S10/50
Inventor 姚玉斌任田峰
Owner DALIAN MARITIME UNIVERSITY
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