Excitation control method for dual-axis excitation turbogenerator

A technology of turbo-generator and biaxial excitation, which is applied in the direction of synchronous generator control and generator control through magnetic field changes, which can solve the problem of the reduction of the ampere-turns of the excitation winding and the reduction of the synthetic excitation magnetomotive force, which limits the stable operation of the generator Limits, unfavorable power system stability and other issues, to achieve the effect of increasing the degree of freedom, realizing the same frequency and asynchronous operation, and reducing the system oscillation time

Pending Publication Date: 2019-04-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

There is only one set of excitation winding on the rotor of a traditional synchronous generator, and the direction of its excitation magnetomotive force can only be fixed on the d-axis of the rotor, which limits the stable operation limit of the generator and is not con

Method used

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  • Excitation control method for dual-axis excitation turbogenerator
  • Excitation control method for dual-axis excitation turbogenerator
  • Excitation control method for dual-axis excitation turbogenerator

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[0035] Example:

[0036] According to the technical scheme of the present invention, a 300MW dual-shaft excitation steam turbine generator is designed. The rotor cross-section of the generator is as follows: figure 1 As shown, the rotor is a two-pole recessed-pole structure, and the two sets of windings on the rotor are perpendicular to each other in space; when single-axis excitation, the d-axis excitation winding is fed with DC current, and the q-axis excitation winding is open circuit; when dual-axis excitation, the two sets of windings Direct current is supplied respectively. A vector illustration of a magnetic field such as figure 2 shown.

[0037] When there is only one set of excitation windings to apply no-load excitation current, the air-gap flux density waveform and the air-gap flux density fundamental wave component when the core is saturated are not considered, such as image 3 As shown, the air gap flux density fundamental wave amplitude is 0.8944T. When the ...

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Abstract

The invention belongs to the technical field of the control of a two-axis excitation generator and particularly relates to an excitation control method for a two-axis excitation turbogenerator. The method comprises the steps that: two sets of excitation windings on d and q axes of a rotor are set, the excitation windings are uniformly distributed on the surface of the rotor and are symmetrical, winding axes are perpendicular to each other, direct current is introduced to the two sets of excitation windings to generate two excitation fundamental wave magnetomotive forces, the position of an airgap synthetic magnetomotive force relative to the rotor is changed by adjusting the proportions of the two excitation fundamental wave magnetomotive forces while a combined excitation magnetomotive force is maintained to be unchanged, and therefore, the static stability limit of the two-axis excitation turbine generator is improved. The two-axis excitation turbine generator can operate at any rotation speed under the corresponding excitation control, the same-frequency asynchronous operation of the generator is realized, the anti-interference ability of the generator is effectively improved,and the power supply reliability of a key area is ensured.

Description

technical field [0001] The invention belongs to the technical field of biaxial excitation generator control, and in particular relates to an excitation control method of a biaxial excitation turbogenerator. Background technique [0002] With the development of large-scale combined power systems, the structure and operation mode of the power grid are becoming more and more complex and changeable, especially for long-distance high-power transmission lines, "strong direct and weak AC" power grid structure, and new energy grid-connected operation modes. The stable operation of the power system brings huge security risks, and the reliability of the power system faces great challenges. Therefore, how to provide power system stability and reliability becomes very important. [0003] As an important component of the power system, the synchronous generator's stable operation ability has an important impact on the stability of the power system. There is only one set of excitation win...

Claims

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Application Information

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IPC IPC(8): H02P9/14H02P103/20
CPCH02P9/14H02P2103/20
Inventor 许国瑞罗超龙李伟力刘晓芳罗应立
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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