LAUSR

In this article, a linear switched active disturbance rejection controller (LSADRC) is proposed for the speed and voltage control of the permanent magnet starter/generator (PMS/G). Different from the existing works, a type of linear switched extended state observer (LSESO) is newly introduced. The observer gains of the LSESO are not fixed anymore but adaptively changed with the value of the system state. First, the relationships are analyzed between the observer bandwidth and the control performance. Then, the whole working process is divided into three regions by the value of the system state and the switching regulations are designed. Furthermore, the stability conditions are derived for the switched error system with an ensured ${\mathcal {L}}_{2}$ gain. Finally, the effectiveness of the proposed method is verified in the 5.5-kW PMS/G platform. The results illustrate the LSADRC can both achieve the smoothness of the control signal and robustness of the PMS/G system.