Abstract
Abstract Recent developments in hybrid automotive industry have led to an increasing interest in the integrated starter generator (ISG) which can perform both engine cranking and battery charging in a single machine. In this study, a permanent magnet synchronous machine (PMSM)-based ISG and a bidirectional converter are applied to a scooter. The analysis is especially focused on regulating the output DC voltage in generation mode via controlling the phase angle. For constant-voltage battery charging, the goal is to maintain the DC-link voltage under various engine speed and different loading conditions. The theoretical approach includes derivation of the system model for revealing the influence of system parameters. Besides, a control scheme using full-state feedback control with integral action is adopted to regulate the output voltage. Particularly, the linear quadratic regulator (LQR) methodology is applied to the linearized system model to acquire the control gains. Both simulations in Matlab/Simulink and experiments using a laboratory platform verify the validity and feasibility of the control strategy for the ISG application. Keywords: Integrated Starter Generator, Permanent-Magnet Synchronous Machine, DC-link voltage control, Voltage phase angle control, Linear Quadratic Regulator