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Synchronous generator q shaft parameter on-line identification method

A technology of synchronous generator and identification method, which is applied to control generator, motor generator control, electronic commutation motor control and other directions, and can solve the problems of different sensitivity characteristics of q-axis parameters.

Inactive Publication Date: 2013-01-30
STATE GRID ANHUI ELECTRIC POWER CO LTD +1
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AI Technical Summary

Problems solved by technology

In the process of parameter identification research on an actual power grid unit, it is found that the sensitivity characteristics of the q-axis parameters of different units are different

Method used

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  • Synchronous generator q shaft parameter on-line identification method
  • Synchronous generator q shaft parameter on-line identification method
  • Synchronous generator q shaft parameter on-line identification method

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Embodiment Construction

[0040] A method for online identification of q-axis parameters of a synchronous generator, comprising the following steps:

[0041] (1) The parameter identification of the synchronous generator adopts the fifth-order model of the generator. This fifth-order model takes into account the effects of excitation winding, damping winding D, Q and rotor dynamics, but ignores the electromagnetic transient process of stator d winding and q winding, that is, pΨ in the stator voltage equation d =pΨ q =0. The fifth-order model equation of the generator is described as follows:

[0042] T d 0 ′ dE q ′ dt = E fd - [ E q ′ + ( x d - ...

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Abstract

The invention discloses a method for utilizing PMU (power management unit) disturbance data to carry out on-line identification on a synchronous generator q shaft parameter. The derivation process of an identification theory is as follows: an error objective function of q shaft parameter identification is obtained according to a generator five-stage model, then, the relative sensitivity of the objective function for each parameter of a q shaft is obtained by aiming at the unit of a practical electric network, a unit is divided into two types, namely an A type and a B type according to the characteristics of the parametric sensitivity of different units, and a method used for identifying the q shaft parameter of the A type unit is provided. The identification method provided by the invention is simple and is less in time consumption, and can be used for improving the identification precision of synchronous reactance.

Description

technical field [0001] The invention relates to the field of parameter identification of synchronous generators, in particular to a method for online identification of q-axis parameters of synchronous generators for different parameter sensitivity characteristics by using actually measured PMU disturbance data. Background technique [0002] The accuracy of the synchronous generator model and parameters is related to the safe and stable operation of the power grid. At present, most of the generator parameters used in power system analysis and simulation are theoretical values ​​or design values ​​provided by the manufacturer, or a simplified model is used as a last resort. Since the influence of actual operating conditions such as eddy current, hysteresis, and saturation cannot be taken into account, the results obtained It is often inconsistent with the actual working conditions, seriously affecting the accuracy and reliability of system analysis and calculation. For this r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 王正风陈实汤伟毕天姝胡世骏薛安成朱六璋万涛汪春燕
Owner STATE GRID ANHUI ELECTRIC POWER CO LTD
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