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A Continuous Power Flow Calculation Method Based on Line Voltage Stability Index

A line voltage stability and power flow calculation technology, applied in calculation, electrical components, circuit devices, etc., can solve problems such as long calculation time, non-adaptiveness, and non-convergence of continuous power flow calculations

Active Publication Date: 2016-03-23
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a continuous power flow calculation method based on the line voltage stability index, which solves the non-convergence problem of the existing power flow calculation method when calculating the continuous power flow and Long calculation time due to non-adaptive step size control strategy

Method used

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  • A Continuous Power Flow Calculation Method Based on Line Voltage Stability Index
  • A Continuous Power Flow Calculation Method Based on Line Voltage Stability Index
  • A Continuous Power Flow Calculation Method Based on Line Voltage Stability Index

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Embodiment 1

[0060] Taking the IEEE14 node system as an example to conduct experiments and analysis, the simulation results are as follows Figure 4 to Figure 8 shown. see figure 2 , this implementation mode is realized by the following steps:

[0061] 1) Read the basic data of power flow calculation and form the system network impedance matrix, set the initial state k=1, and the initial calculation stage flag S 1 = 1, the initial step size σ 1 =1, loss factor u 1 =1, load growth factor λ 1 =1; The specific algorithms for forming the grid node impedance matrix include: node admittance matrix inversion method, branch addition method, see the following literature: Literature [1], "Steady-state Analysis of Electric Power System", Chen Heng, China Electric Power Publishing House , 1995, pp. 139-195;

[0062] 2) Execute power flow calculation to find out the voltage amplitude and phase angle of each load node and the power of each line; the specific methods of power flow calculation incl...

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Abstract

The invention discloses a continuous power flow computation method based on a line voltage stabilization index, and solves problems of poor convergence and long computation time during conventional continuous power flow computation. The line voltage stabilizatiaon index which can effectively describe the partial characteristics of system voltage instability is provided, reactive power consumption of a line is selected as a new parameterization equation according to the index, and an extension continuous power flow equation is constructed; and a step length control strategy is provided and self-adaptively selected according to the different continuous power flow computation stages judged by utilizing angular variation of forecast direction vectors of the extension continuous power flow equation. The method not only overcomes defects of undefined physical significance during selection of a conventional parameterization equitation and poor convergence, but also obviously improves the computational efficiency and shortens computation time through the provided self-adaptive step length control strategy, thereby having remarkable theoretical and technical advantages.

Description

technical field [0001] The invention relates to a continuous power flow calculation method based on a line voltage stability index, which belongs to the field of power system operation analysis and safety control. Background technique [0002] The continuous power flow problem is a combination of the continuity method and the static stability of the power system. By adding continuity parameters to the conventional power flow equation, it overcomes the divergence problem of the conventional power flow calculation method when the system operating point is close to the voltage instability point, and can calculate the voltage stability margin of the system more accurately. Continuous power flow has been widely used in power system static stability assessment and system maximum available transmission capacity calculation, and has become a basic calculation engine in power system operation, planning and energy management systems. It has important support and guiding significance....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 何禹清毛丽林徐超雷川丽
Owner STATE GRID CORP OF CHINA
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