Active Disturbance Rejection Control of Doubly-Fed Induction Generators Driven by Wind Turbines

Abstract

This paper proposes a robust active disturbance rejection control (ADRC) scheme to improve the low voltage ride through (LVRT) of a doubly-fed induction generator (DFIG) for wind turbine applications. There are two main parts of the DFIG control system: controlling the rotor side converter (RSC) and controlling the grid side converter (GSC). This digest replaces the proportional-integral (PI) controllers conventionally used in DFIG control with ADRC-based robust controllers. Each ADRC contains an extended state observer (ESO) for disturbance estimation, a simple proportional controller, and a proportional compensator which compensates the output of the proportional controller with the ESO-estimated disturbance to generate the final output of the ADRC scheme. The RSC inner current loop PI controllers are replaced with ADRCs in this paper. The simulations are conducted on a PSCAD/EMTDC switching level model of a 3.6 MW DFIG wind turbine connected to a power grid to verify the LVRT enhancement using the proposed ADRC method.