Small-impedance branch network contained compensation-method polar coordinate Newton method tidal current calculation method

A technology of power flow calculation and low impedance, which is used in computing, electrical digital data processing, and AC networks with the same frequency from different sources. Effects of Convergence Problems

Inactive Publication Date: 2017-05-24
DALIAN MARITIME UNIVERSITY
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  • Small-impedance branch network contained compensation-method polar coordinate Newton method tidal current calculation method
  • Small-impedance branch network contained compensation-method polar coordinate Newton method tidal current calculation method
  • Small-impedance branch network contained compensation-method polar coordinate Newton method tidal current calculation method

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Embodiment Construction

[0090] Below in conjunction with accompanying drawing, the present invention is further described, according to Figure 3-4 The flow shown performs a power flow calculation for a real large power grid. The actual large grid has 445 nodes and contains a large number of small impedance branches. Among them, there are 49 small impedance branches with x≤0.001, 41 small impedance branches with x≤0.0001, and 22 small impedance branches with x≤0.00001. Among them, the smallest impedance value is the small impedance branch l between node 118 and node 125 118-125 x=0.00000001, transformation ratio k=0.9565, and k is located at the node 118 side. The convergence accuracy of the power flow calculation is 0.00001. In order to verify the convergence of the present invention to calculate the small impedance branch power system containing resistance not 0, the small impedance branch l 118-125 , l 60-122 and l 287-310 The resistor is changed to r=0.0001. Each method used sparse matrix ...

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Abstract

The invention discloses a Newton method tidal current calculation method of small-impedance branch PQ endpoint variable jacobian matrix. The method includes: determining branch types T connected to two end nodes according to size of branch resistance and reactance; adopting different methods to calculate jacobian matrix of the PQ endpoint and other nodes of the small-impedance branch; calculating a modified equation. The jacobian matrix calculation method different from other nodes is adopted to the PQ endpoint of the small-impedance branch during iteration, and the problem about convergence in analyzing the small-impedance branch contained electrical power system with rectangular coordinate Newton tidal current calculation method is solved; when the conventional rectangular coordinate Newton tidal current calculation method is non-convergent, the method can be convergent reliably, and the number of times of iterations is fewer as compared with an existing technology; the problem that convergence in analyzing the small-impedance branch contained electrical power system with the conventional rectangular coordinate Newton tidal current calculation method can be effectively solved, meanwhile, tidal current calculation can be performed on the normal electrical power system, and adverse effect is avoided.

Description

technical field [0001] The invention relates to a power flow calculation method of a power system with a small impedance branch, in particular to a power flow calculation method of the polar coordinate Newton method of the power system. 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 power system according to the given operating conditions and network structure of the power system. 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. Due to the advantages of reliable convergence, fast calculation speed and moderate memory requirements, Newton's method has become the mainstream method for power flow calculation. Newton's method is divided into two forms: polar coordinates and rectangular coordinates. Both ...

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Application Information

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IPC IPC(8): G06F19/00H02J3/06
CPCG16Z99/00H02J3/06
Inventor 姚玉斌吴志良王丹
Owner DALIAN MARITIME UNIVERSITY
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