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access icon free Decoupling start control method for aircraft wound-rotor synchronous starter-generator based on main field current estimation

© The Institution of Engineering and Technology
Received 11/05/2018, Accepted 17/10/2018, Revised 07/10/2018, Published 19/10/2018

Wound-rotor synchronous starter-generator (WRSSG) has the advantages of less volume and weight, high safety and low cost in maintenance, so it is becoming increasingly popular in modern aircraft, especially for more-electric aircraft. The main machine (MM) and main exciter (ME) of the aircraft WRSSG are electromechanically coupled seriously, which makes the start control for the WRSSG complex in the starting mode. In this study, a decoupling start control method for aircraft WRSSG based on main field current estimation is proposed to solve the serious coupling problem and improve start control performance. In the proposed decoupling control method, the main field current is estimated first and used in the closed-loop excitation control for the ME to make the main field current meet the MM demand. With the desired field current, the MM is decoupled with the ME and controlled like a traditional synchronous motor to start the aircraft engine under maximum torque per ampere. The feasibility and effectiveness of the proposed decoupling control method is verified by experimental results.

Inspec keywords: rotors; aircraft power systems; closed loop systems; starting; aerospace engines; synchronous generators; synchronous motors; machine control

Other keywords: closed-loop excitation control; aircraft WRSSG; electric aircraft; starting mode; main exciter; ME; main machine; decoupling start control method; aircraft engine; synchronous motor; MM; aircraft wound-rotor synchronous starter-generator; main field current estimation

Subjects: Synchronous machines; Aerospace power systems; Control of electric power systems; Aerospace propulsion

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