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Damping modeling and checking method in finite element simulation process of steam turbine generator

A technology of turbo-generator and modeling method, which is applied in design optimization/simulation, electrical digital data processing, computer-aided design, etc. test, improve the calculation accuracy, and facilitate the implementation

Active Publication Date: 2019-09-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The traditional rotor damping modeling method has the disadvantages of large error and difficult calibration, and the result is not ideal when calculating the dynamic problems of the turbogenerator

Method used

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  • Damping modeling and checking method in finite element simulation process of steam turbine generator
  • Damping modeling and checking method in finite element simulation process of steam turbine generator
  • Damping modeling and checking method in finite element simulation process of steam turbine generator

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Embodiment Construction

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Taking a domestic QFSN-300-2 turbogenerator as an example, the validity of the damping modeling method in the finite element simulation process proposed by the present invention and the damping parameter verification method based on the principle of rotor AC impedance is verified. The basic parameters of the QFSN-300-2 turbogenerator are shown in Table 1. The measured rotor AC impedance of the generator is 9.54Ω under the AC voltage of 150V and 50Hz.

[0045] First, according to the B-H curve and structural data of the generator, the 2D model of the generator is established by using finite element simulation software, see figure 1 . In the model attribute setting stage, the known BH characteristic curve data is used to define the ferromagnetic material properties, and the air gap permeability is set as the vacuum permeability....

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Abstract

The invention discloses a damping modeling and checking method in a finite element simulation process of a steam turbine generator. The damping modeling method comprises the following steps of: a, defining ferromagnetic material attributes of a built generator two-dimensional model according to B-H curve data of a generator;; b, setting the top 1 of the large tooth area of the rotor as a single-layer conductor structure; c, setting the tops of the small teeth of the rotor to be of a single-layer conductor structure; d, enabling the rotor damping strips to be made of aluminum alloy; and e, building a plurality of damping cages. The checking method of the modeling method comprises the following steps: a, building an external circuit, and performing simulation to obtain an excitation currenteffective value I; b, calculating a simulation value Z'of the alternating current impedance of the generator rotor; c, calculating the checking criterion a% of the alternating current impedance of thegenerator rotor; and d, setting a damping model according to the requirement on the precision of the damping model to accurately judge the threshold X. The calculation precision of the built finite element simulation model of the steam turbine generator can be improved, and damping parameters in the built simulation model can be conveniently and reliably verified.

Description

technical field [0001] The invention relates to the technical field of steam turbine generator damping winding modeling and parameter verification. Background technique [0002] Turbogenerator is one of the most important equipments in the power system, and its operating characteristics, especially the dynamic characteristics, play an important role in the stability of the power system. In the dynamic process of the generator, the rotor damping plays an important role. The rotor damping can suppress and weaken the harmonic magnetic field, asynchronous magnetic field or abrupt magnetic field that may appear inside the turbogenerator, which can reduce the fluctuation of the excitation current and reduce the occurrence of overshoots in the excitation winding. voltage potential, and also reduce torque fluctuations or shocks of the generator during dynamic processes. [0003] In the finite element simulation of turbogenerators, most of the traditional damping models are designed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 武玉才周婕李永刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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