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Load model identification method based on transformer substation measurement

A load model and identification method technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem that the accuracy of the load model needs to be improved, and achieve the effect of preventing premature phenomenon and improving convergence accuracy.

Inactive Publication Date: 2014-06-18
STATE GRID CORP OF CHINA +2
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AI Technical Summary

Problems solved by technology

Although previous research has achieved certain results, as the power grid becomes more and more complex, the accuracy of the load model still needs to be improved.

Method used

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  • Load model identification method based on transformer substation measurement
  • Load model identification method based on transformer substation measurement
  • Load model identification method based on transformer substation measurement

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Embodiment

[0028] figure 1 It is a flow chart of a specific embodiment of the load model identification method based on substation measurement in the present invention. Such as figure 1 As shown, the load model identification method based on substation measurement of the present invention includes the following steps:

[0029] S101: Divide the motor group, equivalent to the induction motor:

[0030] The power grid is interconnected as one, and its analysis and calculation need the support of the whole network data, and the operation, management and dispatch of the power system are layered and partitioned, so it is extremely difficult and cumbersome to obtain the whole network data in real time. value model, the present invention adopts a hierarchical coordination method between power grids for calculation. Therefore, the substations in the power grid are divided into motor groups first, and each motor group is represented by an equivalent induction motor and a static load. The specif...

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Abstract

The invention discloses a load model identification method based on transformer substation measurement. The load model identification method comprises the steps of performing homology cluster division on transformer substations in a power grid, constructing load models of equivalent induction motors, constructing an identification criterion function, optimizing load parameters to be identified in the load models according to a response between input voltage and an output of an actual system by a particle swarm algorithm, and counting the load models of different stations to obtain a regional power grid load model parameter library. According to the load model identification method, an initial active power proportional coefficient Kpm and a rated initial load rate coefficient Mlf are introduced into the identified parameters, so that the influence caused by the time-varying characteristic of a load amplitude value is eliminated, and the load models are more accurate; due to the arrangement of a speed adjustment factor and an inertia factor of the particle swarm algorithm, the convergence precision of the algorithm is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system load models, and more specifically relates to a load model identification method based on substation measurement. Background technique [0002] The power system is an organic whole composed of four major parts: power generation, power transmission, power distribution and power load. Among them, the power load is the general term for the electrical equipment in the power network, and sometimes includes the distribution network used to connect the power equipment. Since the power system has the characteristics that electric energy cannot be stored in a large amount and the power grids are highly correlated with each other, when the power grid is in a normal state, all links of the power grid maintain a dynamic balance, and when any part of the power grid fails, the rest of the power grid may be severely affected. The large impact will eventually lead to local disturbance of the power ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 丁理杰王均黄琦魏巍刘影张周晶郭巍朱超
Owner STATE GRID CORP OF CHINA
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