Abstract

In wind energy conversion systems, the fundamental frequency step-up transformer acts as a key interface between the wind turbine and the grid. Recently, there have been efforts to replace this transformer by an advanced power electronics based solid-state transformer (SST).

This paper proposes a configuration that combines the doubly fed induction generator (DFIG) based wind turbine and SST operation. The main objective of the proposed configuration is to interface the turbine with the grid while providing enhanced operation and performance. In this work, SST controls the active power to/from the rotor side converter (RSC), thus, eliminating the grid side converter (GSC).

The proposed system meets the recent grid code requirements of wind turbine operation under fault conditions. Additionally, it has the ability to supply reactive power to the grid when the wind generation is not up to its rated value. A detailed simulation study is conducted to validate the performance of the proposed configuration.