Fault recovery control strategy of a two-stroke free-piston linear generator

This paper proposes a recovery control strategy of a two-stroke free-piston linear generator. The recovery process is implemented through switching the linear electric machine into motoring mode once certain unstable operation like misfire occurs during stable cycles. Various operation states are illustrated. Both the steady operation strategy and the fault recovery strategy are analyzed and simulated. The analysis experiments results show that the proposed recovering strategy is feasible and easy to be implemented. The unstable situation can be effectively recovered during 20ms or less, and has no negative influence on the next stable operation.