Model Predictive Control with Fixed Switching Frequency for the Dual PWM Converter Based PMSG System

Abstract

In the daul PWM converter system of permanent magnet synchronous generator, the passivity can achieve global asymptotic stability and improve the robustness to external disturbances of the system. However, the power ripple on the grid-side is still large. Aiming at this problem, an model predictive control with fixed switching frequency is proposed in this paper. The mathematical model of the grid-side converter is established and analyzed, then the cost functions of the model predictive control is selected based on the active and the reactive power error. Furthermore, according to the analysis and the derivation of the cost function, SVPWM technique is applied to achieve the fixed switching frequency, so as to reduce the switching losses. The simulation and the experimental results show that the proposed model predictive control scheme can depress the power ripple on the grid-side effectively.