Fault-Tolerant Control of Doubly Salient Electromagnetic Generator Based on Capacitor Split-Phase Bridge Converter Under Loss of Excitation

Doubly salient electromagnetic machine (DSEM) has the advantages of simple construction, easy power generation control, and convenient fault deexcitation, making it a promising application in the aviation field. Aviation power generation system puts forward higher requirements for the reliability of generators. Despite the various studies on the fault-tolerant control of DSEM, there are few studies on fault-tolerant control of excitation fault in aviation power generation systems. Therefore, the main purpose of this article is to achieve a fault-tolerant power generation (FTPG) system for doubly salient electromagnetic generator (DSEG) on the event of excitation fault and improve the fault tolerance ability of the system, which can improve output power and reduce the copper loss of DSEG under loss of excitation. This article analyzes the basic principle of normal power generation about DSEG, establishes its equivalent circuit after excitation loss, and dissects the control strategy for the FTPG with loss of excitation based on a bridge converter. Besides, this article also proposes a fault-tolerant control system and its control strategy based on a capacitor split-phase bridge (CSPB) converter for DSEG, with higher generated power as well as lower copper loss. Based on the above hypothesis, experiments are performed on a power generation system for 12-/8-pole DSEG to verify the feasibility of the proposed method.