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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2023, Vol. 44 ›› Issue (10): 327812-327812.doi: 10.7527/S1000-6893.2022.27812

• Electronics and Electrical Engineering and Control • Previous Articles    

Multi⁃loop energy control method of linear active disturbance rejection for solar⁃powered UAVs

Jiaqi SHAO, Xiaohui ZHANG(), Hanyu XI, Zirong LIU   

  1. School of Aerospace Engineering,Beijing Institute of Technology,Beijing  100081,China
  • Received:2022-07-14 Revised:2022-08-01 Accepted:2022-09-30 Online:2023-05-15 Published:2022-10-14
  • Contact: Xiaohui ZHANG E-mail:shelhuei@bit.edu.cn
  • Supported by:
    Aeronautical Science Foundation of China(2020Z005072001)

Abstract:

To achieve high-efficiency management and control of solar cell/lithium battery hybrid energy systems for solar-powered UAVs, we propose a multi-loop control method based on Linear Active Disturbance Rejection Control (LADRC) to dynamically control the voltage/current of the power system, realizing efficient use of solar energy and avoiding overcharging of lithium batteries. The LADRC method is used to actively eliminate the system disturbance, improve the robustness and stability of the controller, and quickly and stably respond to the external dynamic changes during the maneuvering process of the solar UAV. A joint control method combining Maximum Power Point Tracking (MPPT) loop, voltage regulation loop and current limiting loop is designed to realize the simultaneous control of multiple state quantities of the energy management controller. A competition mechanism is introduced to settle the frequent working mode switching of the controller. The LADRC controller mathematical model is first established for the MPPT loop, and the dynamic response is compared with the PID method. A solar cell/lithium battery hybrid energy test platform is then built to couple the irradiation of the solar wing with the flight attitude, and the octagonal flight simulation test conducted for the proposed multi-loop control method. The results show that the maximum power point tracking time of the single/multi-loop control system based on the LADRC method can be reduced by 40%-70%, and the control system is more stable with accelerated transient response. During the flight simulation test, the proposed multi-loop control method can smoothly switch the working mode of the controller according to the flight load and battery power state, so that the photovoltaic system can always output with the best energy efficiency. The research results can provide a theoretical basis and engineering technical support for the high-efficiency flight of solar-powered UAVs.

Key words: solar power, UAVs, hybrid power, energy control strategy, multi-loop control, Linear Active Disturbance Rejection Control (LADRC)

CLC Number: