Enhanced I/F Starting Control Method of Brushless Synchronous Starter/Generator with High-Frequency Signal Injection

The main generator (MG) of the aviation brushless synchronous starter/generator (BSSG) has damping windings in the rotor and its stator inductance is very small, leading to the difficulty of directly applying the traditional high-frequency injection method to sensorless starting control of BSSG at zero-and low-speed range. The I/F starting control method is an open-loop scheme with the advantages of a simple algorithm, easy implementation, and applicability to various machines, so it is a very competitive zero-and low-speed sensorless starting scheme for BSSG. However, due to the heavy load and significant torque fluctuations of BSSG, traditional I/F starting control methods could cause difficulty in regulation, out-of-step fault, and poor reliability. To solve this issue, this paper proposes an enhanced I/F starting control method based on the special structural characteristics of BSSG. This method preserves the advantages of the traditional I/F algorithm while effectively resisting external disturbances, reducing the regulation difficulty and the risk of out-of-step, thus achieving highly reliable zero-and low-speed sensorless starting control of BSSG. The effectiveness of this method is verified by simulation.