Fast Terminal Sliding Mode Control with Nonlinear Disturbance Observer for Buck Converter with Space Vector Pulse Width Amplitude Modulation

Motor drive systems using permanent magnet synchronous motors (PMSMs) and high-voltage batteries frequently encounter current ripples and reduced efficiency during lowspeed operation. To address this issue, a bidirectional buck converter with space vector pulse width amplitude modulation (SVPWAM) can be implemented to improve the inverter efficiency. For optimal SVPWAM control, this paper proposes a method using fast terminal sliding mode control (FTSMC). This method not only enhances inverter efficiency but also improves torque control performance and reduces RMS values compared to the proportional-integral (PI) control method. In addition, the effectiveness of the proposed method, especially with parameter updater is clarified through simulations and experiments.