Model predictive control of generator side converter in wave energy generation system with switching losses

To reduce harmonics and switching losses of the generator side converter in the wave energy generation system, a double-vector deadbeat model predictive torque control strategy with minimum switching loss is proposed for PMSM fed by a voltage source inverter (VSI). First, the discrete mathematical model is established, on this basis, the calculation expression for the reference voltage vector that satisfies the deadbeat condition of d-axis current and electromagnetic torque at the same time. Then, the double-vector modulation is improved. To reduce the switching frequency, the switching action mode and duty cycle of some sectors are optimized, ensuring that the switching action occurs in only one phase of the bridge arm in each carrier cycle. Furthermore, by deriving the analytical expressions for switching losses of double vector modulation before and after optimization, the effectiveness of the proposed method is theoretically demonstrated. Finally, a simulation model is constructed in the electric-thermal joint simulation environment of Matlab and Plecs, and the control performance and switching losses of the proposed method are compared with those under the traditional double-vector modulation.