Flexible arrangement of static converters for grid connected wind energy conversion systems

This paper presents a new flexible arrangement of static converters for grid connected Wind Energy Conversion Systems (WECS). The proposed arrangement uses three phase voltage fed back-to-back mass produced power converter modules with reconfiguration switches. The main features of the proposed flexible arrangement are: (i) expanded reactive power capability limits, (ii) high efficiency mainly under low wind conditions where the active power is reduced, and (iii) low current harmonic content. In addition, a detailed description of the operating modes, as well as the grid, generator and circulating current controllers design are given. Finally, simulation results demonstrate the good performance and flexibility of the proposed arrangement.