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Continuous load flow calculation method based on partial geometrical parameterization

A technique of local geometry, power flow method, applied in computing, computer control, AC network with the same frequency from different sources, etc., can solve calculation failure, power flow bifurcation point calculation failure, local parameterization method non-power flow bifurcation Problems such as point calculation failure

Active Publication Date: 2013-05-22
TSINGHUA UNIV
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Problems solved by technology

Both types of methods have the problem of calculation failure. The local parameterization method has the problem of calculation failure of non-power flow bifurcation points, while the global parameterization method has the problem of failure of calculation of power flow bifurcation points.

Method used

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  • Continuous load flow calculation method based on partial geometrical parameterization
  • Continuous load flow calculation method based on partial geometrical parameterization
  • Continuous load flow calculation method based on partial geometrical parameterization

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Embodiment

[0063] In order to illustrate the implementation process of the inventive method, the IEEE14 node system (http: / / motor.ece.iit.edu / data / ) is used as an example. The convergence criterion of continuous power flow calculation is unified as ‖Δx|| ∞ -5 . The power growth direction of all load nodes and generator nodes is 0.1 times of the base state power.

[0064] In the initial stage, ordinary power flow is used to calculate the power flow results after the load factor increases, until the number of iterations of ordinary power flow calculation exceeds 20, switch to the local geometric parameterized continuous power flow calculation method, and continue to calculate the power flow.

[0065] Select the node 5 with the fastest voltage drop in the grid as the local geometric parameterization node, and select the value of N as 25. According to the formula (19), the parameterization variable t in the next step can be obtained β . growing t β , stop calculation until λfigure 2 As s...

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Abstract

The invention relates to a continuous load flow calculation method based on partial geometrical parameterization and belongs to the technical field of dispatching automation of electric power system and power grid emulation. The method comprises a node voltage which is fastest to descend and parameterization variable defined by the slope of a straight line decided by a load growth factor. Around a branch point, a one-dimensional partial geometrical parameter constraint equation is added to obtain a nonsingular extension load flow equation to enable continuous load flow to cross the branch point to reliably draw a complete PV curve. The continuous load flow calculation method has the advantages of being high in efficiency, robust, and suitable for large power network online application.

Description

technical field [0001] The invention belongs to the technical field of power system scheduling automation and power grid simulation, and in particular relates to a continuous power flow method based on local geometric parameterization. Background technique [0002] Continuous power flow is an important tool for power system voltage stability assessment. The purpose of continuous power flow calculation is to solve the maximum load of the power system. The PV curve obtained from the continuous power flow calculation can provide information on the voltage stability and voltage stability margin of the power system. [0003] Traditional continuous power flow calculation methods can be mainly divided into two categories: local parameterization and global parameterization methods. These two types of methods all have the problem of calculation failure. The local parameterization method has the problem of calculation failure of non-power flow bifurcation points, while the global par...

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Application Information

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IPC IPC(8): G06F19/00
CPCG05B15/02H02J3/06
Inventor 吴文传张伯明孙宏斌郭庆来巨云涛
Owner TSINGHUA UNIV
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