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A Voltage Estimation Method for Approximate Calculation of Power Flow in Power System

A power system and approximate calculation technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficult to give effective information on reactive power and voltage, and achieve fast calculation speed

Active Publication Date: 2019-03-08
STATE GRID CORP OF CHINA +2
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the unreasonable arrangement of reactive power and voltage that causes the power flow to fail to converge, conventional power flow calculation programs are often difficult to provide effective information on reactive power and voltage. Make tentative adjustments on transformer taps, machine terminal control voltage, etc. until the power flow converges

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  • A Voltage Estimation Method for Approximate Calculation of Power Flow in Power System
  • A Voltage Estimation Method for Approximate Calculation of Power Flow in Power System
  • A Voltage Estimation Method for Approximate Calculation of Power Flow in Power System

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Embodiment Construction

[0046] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0047] In the voltage estimation method of the present invention, on the basis of obtaining approximate active power flow results through DC power flow calculations, a virtual transformer branch is introduced for each voltage given node by using a virtual reference node, and each branch in the grid is The parallel structure of branch reactance and current source is represented by the Norton equivalent, and the node susceptance matrix is ​​formed according to the branch reactance. According to the reactive power of the unit and the...

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Abstract

The invention provides a voltage estimation method for power flow approximate calculation of a power system. The method comprises: step 1, performing direct-current power flow calculation on a grid to obtain a voltage phase angle theta of each node in the grid and active power Pbranch of each branch; step 2, constructing a grid equivalent model, and establishing a voltage estimation equation according to the model; and step 3, performing iterative calculation on the voltage estimation equation to obtain a voltage estimation result. Compared with the prior art, the voltage estimation method for power flow approximate calculation of the power system overcomes the defect that only the active power and the node voltage phase angle can be estimated by the direct-current power flow calculation, reserves the advantages of high speed and no convergence of the direct-current power flow calculation, and can estimate reactive power and node voltage amplitude based on the direct-current power flow calculation result, thereby comprehensively realizing power flow approximate calculation of the power system.

Description

technical field [0001] The invention relates to a voltage estimation method, in particular to a voltage estimation method for approximate calculation of power system power flow. Background technique [0002] Power flow calculation is the basis of power system calculation and analysis. The mathematical model of conventional power flow calculation is a set of nonlinear equations. When the data quality is good and the power flow calculation converges normally, the power flow results are generally accurate enough. However, due to the characteristics of the nonlinear equation itself, it often occurs that the power flow calculation does not converge. There are two reasons why the power flow calculation does not converge: the power flow equation has no solution, and the power flow equation has a solution but has not obtained a convergent solution. In addition, conventional power flow calculations require a large amount of calculations, and in situations where a large number of calc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 王虹富马士英侯俊贤陶向红肖静刘燕嘉范亚娜郅治张志强孙谊媊于永军祁晓笑秦艳辉王芳楠郑少鹏
Owner STATE GRID CORP OF CHINA
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