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Synchronous generator q shaft parameter on-line identification method

A technology of synchronous generator and identification method, which is applied in the control of generator, motor generator control, electronic commutation motor control, etc., can solve the problem of different sensitivity characteristics of q-axis parameters

Inactive Publication Date: 2015-03-25
STATE GRID ANHUI ELECTRIC POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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Experimental program
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Embodiment Construction

[0030] An online identification method for the q-axis parameters of a synchronous generator includes the following steps:

[0031] (1) The parameter identification of synchronous generator adopts the fifth-order generator model. This fifth-order model takes into account the role of excitation winding, damper winding D, Q and rotor dynamics, but ignores the electromagnetic of stator d winding and q winding. Transient process, that is, pΨ in the stator voltage equation d =pΨ q =0; the fifth-order model equation of the generator is formula (1):

[0032] T d 0 ′ dE q ′ dt = E fd - [ E q ′ + ( X d - X d ′ ) I d + ( K G - 1 ) E q ′ ] T d 0 ′ ′ dE q ′ ′ dt = - E q ′ ′ - ( X d ′ - X d ′ ′ ) I d + E q ′ + T d 0 ′ ′ dE q ′ dt T q 0 ′ ′ dE...

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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 synchronous generator parameter identification, and in particular relates to a method for on-line identification of synchronous generator q-axis parameters based on different parameter sensitivity characteristics using actual 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, the generator parameters used in power system analysis, calculation and simulation are mostly theoretical values ​​or design values ​​provided by manufacturers, or simplified models are used as a last resort. Since eddy current, hysteresis, saturation and other actual operating conditions cannot be considered, the results obtained It is often inconsistent with the actual working conditions, which seriously affects the accuracy and credibility of system analysis and calculation. For this reason, the Sta...

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Application Information

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Patent Type & Authority Patents(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