Excitation Control Method of Aeronautical Three-Stage Start-up Generator System in Start-up Stage
A technology for start-up generation and start-up phase, which is applied in the direction of motor generator/starter, AC motor control, control system, etc., and can solve the problems of inconstant excitation magnetic field of main generator and increased complexity of optimal start control of main generator, etc. , to achieve the effects of constant size, constant relative speed, and reduced complexity
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[0031] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0032] The principle block diagram of the inventive method is as figure 2As shown, the current vector amplitude of the two-phase current of the exciter is obtained through sampling, calculation, and filtering, and the current vector amplitude of the modulation voltage is obtained through PI control after taking the difference from the current reference value; by comparing the current speed with the intermediate speed, Select different phase angle calculation formulas to obtain the modulation voltage vector phase angle. The modulated voltage vector drives the two-phase inverter to supply power to the two-phase exciter through a PWM modulation method. In this embodiment, the two-phase inverter adopts a double full-bridge two-phase inverter (such as image 3 shown), the voltage modulation method adopts SVPWM, and the rotational speed sensor adopts a resolver.
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