Extended State Observer Based Global Terminal Sliding Mode Control for Three-Phase Voltage-Source PWM Rectifier

For improving the performance of three phase voltage source pulse width modulation rectifier (VSR) under large signal disturbance, this paper proposes an extended state observer (ESO) based global fast terminal sliding mode control (GFTSMC). The ESO is designed to observe and compensate for the total disturbances which include both the external disturbances and the unmeasured states and modeling uncertainties. The GFTSMC is proposed to enhance the dynamic response of output voltage and reduce AC harmonic content. The proposed control strategy is compared and verified with PI control method and sliding mode control method with exponential reaching law (ERL-SMC) by numerical simulation. The results confirm the superiority of the proposed control strategy in dynamic performance and disturbance rejection.