High Dynamic Response Sensorless Voltage Stability Control for Permanent Magnet Synchronous Starter-Generator in Aerospace Application

To improve the output voltage quality during sensorless power generation, this paper proposes a load current feedforward based sensorless voltage stability control with estimation error compensation for the dual three-phase permanent magnet synchronous starter-generator in aerospace applications. The overall control framework includes three key parts: the sliding mode observer (SMO), the load current feedforward, and the estimation error compensation. The SMO performs the sensorless control part. To improve the estimation accuracy, the estimation error compensation is proposed to remedy the errors caused by the first-order low-pass filter, sampling delay, and dead time. Moreover, to suppress the DC bus voltage sags under heavy load and improve the voltage recovery speed during load mutation, a load current feedforward compensation method is firstly proposed. The simulation results show that this new control method possesses good estimation accuracy and excellent voltage stability control performance. Under complex working conditions such as sudden load change and speed variation, the output voltage quality can be guaranteed to meet the standard.