Comparative Study of DPC and Backstepping Controllers in a Doubly Fed Induction Generator-Based Wind Energy Conversion System

Abstract

This paper makes a comparison of two applied control strategies on wind energy conversion systems based on doubly fed induction generator technology: non-linear backstepping and direct power control. Much more effective in managing disturbances and uncertainties is the backstepping, with its nonlinear strategy and robustness. On the other hand, DPC is simple with very quick responses, but it is subject to the constraints of oscillation in the control variables and variable switching frequency. This paper makes a comparative study in assessing the robustness and performance of each method within the different operating regimes of the DFIG, based on simulation results. It is concluded that backstepping is a better solution for a long-time-performance problem, while DPC presents an effective approach for applications that require a faster response and easier method of implementation.