Advanced control strategy for bidirectional three phase AC/DC converter

Abstract

This paper describes an advanced control strategy of a bidirectional three-phase PWM AC/DC converter embedded between a micro-grid and utility. This converter proves an ability to control a bidirectional power flow. Firstly, the improved control strategy is based on direct power control using a new switching lookup table obtained from the derivative analysis of the active and reactive power. Furthermore, the improved control strategy is verified by simulation. In addition, many operating modes are established due to verify the capability of a bidirectional power flow of the converter. Particularly, authors focus on three operating scenarios which are cited as follow: Inversion Mode (IM), Shut-Down Mode (S-DM) and Rectification Mode (RM). Moreover, the authors show the capability of the DPC with respect to the LVRT for Tunisian grid. Finally, the performances of this converter are validated experimentally using a Dspace 1104 board, a bidirectional AC/DC converter and the wind turbine using a SM connected with the rectifier. The simulation results compared to the experimental ones demonstrated the good performances of the proposed control strategy.