A Continuous Power Flow Calculation Method Based on Local Geometry Parameterization

A technology of local geometry and power flow calculation, applied in calculation, AC network with different sources of the same frequency, electrical digital data processing, etc., can solve calculation failure, power flow bifurcation point calculation failure, local parameterization method non-power flow Problems such as bifurcation point calculation failure

Active Publication Date: 2016-02-10
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.

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  • A Continuous Power Flow Calculation Method Based on Local Geometry Parameterization
  • A Continuous Power Flow Calculation Method Based on Local Geometry Parameterization
  • A Continuous Power Flow Calculation Method Based on Local Geometry 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 power grid as the local geometric parameterization node, and select the value of N as 25. According to the formula, the parameterization variable t in the next step can be obtained β . growing t β , until λ figure 2 As shown, it can b...

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Abstract

A method for obtaining a continuous power flow of an electric power system is provided. The method comprises: establishing first power flow equations for PQ buses, and establishing second power flow equations for PV buses; establishing power flow equations according to the first flow equations, the second power flow equations, and a voltage magnitude and a voltage phase of a balance bus; choosing a bus having a fastest voltage drop as a parameterization bus, and defining a parameterization variable according to a voltage magnitude of the parameterization bus and the load growth factor; defining an equality constraint equation according to the parameterization variable, and generating an extended power flow equation according to the equality constraint equation and the power flow equations; solving the extended power flow equation by a plurality of iterations to obtain a plurality of load summations; generating a P-V curve according to the plurality of load summations.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCH02J3/06
Inventor 吴文传张伯明孙宏斌郭庆来巨云涛
Owner TSINGHUA UNIV
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