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Excitation control method and device used in starting process of aeronautical tertiary brushless AC synchronous motor

An AC synchronous motor, starting process technology, applied in the control system, control generator, electrical components and other directions, can solve the problem of affecting the load capacity of the main generator, the fluctuation of the main generator rotor flux linkage, and the inability to effectively exert the excitation of the exciter. output capacity, etc.

Active Publication Date: 2013-01-16
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the exciter adopts the single-phase AC excitation method, it still faces the following problems: 1) At a suitable excitation frequency, due to the large inductive reactance of the exciter, the stator excitation current of the exciter is much smaller than its rated value, and cannot effectively exert The excitation output capacity of the exciter causes the rotor excitation of the main generator to be weak, which affects the load capacity of the main generator in the motoring state; 2) Compared with the DC excitation method, the rotor of the main generator in the single-phase AC excitation method Fluctuation of the flux linkage is large, which affects the running stability of the main generator in the motoring state; 3) When the unit reaches a certain speed, the excitation output capacity of the exciter using the DC excitation method will be better than that using the single-phase AC excitation method , when the DC excitation mode is adopted, the load running performance of the main generator can be effectively improved
Based on the above reasons, when the unit reaches a certain speed, it is necessary to switch the exciter from AC excitation to DC excitation. The flux linkage of the generator rotor fluctuates greatly, and the generated torque ripple may easily cause the unit to fail to start

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  • Excitation control method and device used in starting process of aeronautical tertiary brushless AC synchronous motor
  • Excitation control method and device used in starting process of aeronautical tertiary brushless AC synchronous motor
  • Excitation control method and device used in starting process of aeronautical tertiary brushless AC synchronous motor

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Embodiment Construction

[0048] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0049] The excitation control method of the aviation three-stage brushless AC synchronous motor starting process in this embodiment ( figure 2 ):

[0050] The principle block diagram of the inventive method is as figure 2 As shown, the modulation degree of the AC excitation component is determined by the motor speed ω r Determined, the modulation degree of the DC excitation component is determined by the rated excitation current i of the exciter * and the actual excitation current i are adjusted by the PI regulator, and its adjustment upper limit M Dmax The degree of modulation M by the AC excitation component A It is determined that the finally obtained AC / DC excitation output is synthesized according to the modulation algorithm proposed by the present invention, and the variable value for controlling the H-bridge inverter is obtained to realize the excita...

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Abstract

The invention relates to an excitation control method and device used in the starting process of an aeronautical tertiary brushless AC synchronous motor. When the motor stops, a controller can output the maximum AC excitation quantity for an exciter to excite; when the motor rotates at a certain speed, the AC excitation quantity starts to decrease linearly, meanwhile, a PI (Proportion Integration) regulator regulates and intervenes DC excitation quantity, and the regulation upper limit is comprehensively determined by the magnitude of AC excitation component and the bus voltage of the controller. When the AC component decreases to zero, the exciter enters the DC excitation mode. When the excitation control method is used for starting the tertiary brushless AC synchronous motor, flux linkage fluctuation of a main generator rotor, caused when the exciter directly switches the excitation mode, is avoided, and the running stability of a unit which conducts excitation switching in the starting process is effectively improved.

Description

technical field [0001] The invention relates to an excitation control method and device in the starting process of an aviation three-stage brushless AC synchronous motor, which is a control method for solving the excitation problem of an aviation three-stage brushless AC synchronous motor in the starting process by using single-phase space vector modulation The method belongs to the technical field of AC motor transmission. Background technique [0002] The dual-function integration of starting / generating is an important development direction of the future aviation AC power system. At present, three-stage brushless AC synchronous motors are widely used in aviation high-power AC power systems (see figure 1 ) as a generator, when the motor is used to realize the starting function of the aeroengine, the main generator will run in an electric mode. Since the motor is a brushless structure, when the motor is stationary, if the exciter is still in the power generation state The ...

Claims

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Application Information

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IPC IPC(8): H02P9/08
Inventor 刘卫国马鹏骆光照蒋鸿姜宇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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