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Power grid loss online calculation method based on power flow distribution data after state estimation

A technology of power flow distribution and state estimation, applied to AC network circuits, AC networks with the same frequency from different sources, electrical components, etc., can solve the problem of low accuracy of the model, and achieve error correction, good convergence, and high precision Effect

Inactive Publication Date: 2017-09-15
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the published online loss calculation method based on SCADA system data for grid loss directly uses SCADA system data and models to calculate grid loss, which has the problem of low accuracy of the model and cannot truly reflect the actual loss of the grid.

Method used

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  • Power grid loss online calculation method based on power flow distribution data after state estimation
  • Power grid loss online calculation method based on power flow distribution data after state estimation
  • Power grid loss online calculation method based on power flow distribution data after state estimation

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Embodiment 1

[0051] The online calculation method of power grid losses based on the power flow distribution data after state estimation, such as figure 1 As shown, the method includes the following steps:

[0052] a. The power grid is a power grid with a voltage level of 35kV and above, and the power grid has a power grid dispatching SCADA system, and the power grid contains M transformers, N lines, S substations and H capacitive reactors;

[0053] b. From the interface of the power grid dispatching SCADA system, obtain the current I of the ith line in the power flow distribution data of the power grid after the state estimation i and the current I of the jth transformer j , the operating state S of the s-th substation s and the operating state H of the h-th capacitive reactor h , and the total power supply A of the grid ME ;

[0054] c. Combined with the nameplate parameters of the power grid components, offline acquisition of the no-load loss of all transformers in the power grid, t...

Embodiment 2

[0085] The online calculation method of main network power loss based on the power flow distribution data after state estimation provided in this implementation has been verified in the main network system of a central city in a certain province in my country. The verification system has 137 transformers, 29 power points, 200 load points, and 166 transmission lines.

[0086] In the on-line calculation method of main network power loss based on the power flow distribution data after state estimation in the present invention, the fixed loss calculation of the power grid on-line operating element in the step (d) includes the following sub-steps:

[0087] d1, transformer no-load loss A 1

[0088]

[0089] In the formula, A Tj represents the no-load loss of the jth transformer, when I j When ≠0, J j =1, when I j =0, J j =0,j=1,2,...,M;

[0090] d2. Corona loss A of high-voltage lines 2

[0091]

[0092] In the formula, A Li Represents the corona loss of the ith line...

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Abstract

The invention discloses a power grid loss online calculation method based on power flow distribution data after state estimation, and relates to loss calculation of an electric power system. According to the method, data acquisition after state estimation is performed by adopting a power grid dispatching SCADA system; bad data in the online monitoring is corrected; accuracy of use data is ensured while power grid loss is divided into a fixed loss part and a variable loss part to be calculated separately, and the total electric energy loss of the power grid is obtained by summation; and by combination with the SCADA system, power supply quantity data of the power grid is obtained, and then the electric energy loss rate of the power grid is calculated. The power grid loss online calculation method has the advantages that the power grid loss calculation model in the power grid dispatching SCADA system is corrected, and the calculation method has high adaptivity and calculation precision.

Description

technical field [0001] The invention relates to the field of electric power systems, in particular to an online power grid loss calculation method based on power flow distribution data after state estimation. Background technique [0002] Power loss is the amount of power lost in the process of supplying and selling electricity in the power grid, and it is an important economic indicator for evaluating the operation of the power grid. Essentially, in the process of power transmission, power loss inevitably occurs in each element of the power grid. How to calculate the power loss of the power grid is one of the basic conditions for evaluating the economic operation of the power grid. At the same time, energy conservation and loss reduction is a long-term national policy for my country's energy utilization. The theoretical calculation of power loss in power grid is the scientific basis for power network loss analysis and guidance for loss reduction. Therefore, carrying out ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/06
CPCH02J3/00H02J3/06H02J2203/20
Inventor 刘巨欧阳俊杨东俊阮博徐秋实姚伟
Owner STATE GRID CORP OF CHINA
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