Abstract
The control system for a Doubly Fed Induction Generator (DFIG) supplied by a grid-connected Current Source Converter (CSC) is presented in this paper. Nonlinear transformation of DFIG model to the multi-scalar form is proposed. The nonlinear control strategy of active and reactive power of DFIG is realized by feedback linearization. In the proposed control scheme, the DFIG model and CSI parameters are included. Two Proportional-Integral (PI) controllers are dedicated for the control of the respective active and reactive powers. The control variables are the dc-link input voltage vector and the angular speed of the inverter output current. The proposed control approach is characterized by satisfactional dynamics and provides enhanced quality of the power transferred to the grid. In the simulation, evaluation of the characteristic operating states of the generator system, correctness of the feedback linearization and the dynamics of active and reactive power control loops are studied. Simulation results are adequately provided.
Highlights
Simulation studies were performed to analyze the operation of the proposed control system based on active and reactive powers and nonlinear transformations of variables
The authors carried out comparative tests of four Doubly Fed Induction Generator (DFIG) system scenarios:
Oscillations do not appear in the system dynamics when the nonlinear control scheme is deplored
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Generators (DFIGs) as a variable-speed drive for wind turbines are: reduction of stress in the mechanical structure, acoustic noise reduction, and the possibility to control active and reactive power. They have been widely adopted in wind energy conversion systems since the early 1990s because of the advancement and low-cost power electronic converters. The main contribution of the paper is that in the proposed method there are only two PI controllers of the active and reactive stator power with the new linearized feedback control law in the control system structure. The proposed nonlinear control structure of DFIG with the CSI is compared with the classical Field-Oriented Control by using the simulation results and quantitative approach based on the tracking errors
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