Enhancement of the direct power control applied to DFIG-WECS

Abstract

<span lang="EN-US">This work is dedicated to the study of an improved direct control of powers of the doubly fed induction generator (DFIG) incorporated in a wind energy conversion system 'WECS'. The control method adopts direct power control 'DPC' because of its various advantages like the ease of implementation which allows decoupled regulation for active and reactive powers, as well as a good performance at transient and steady state without PI regulators and rotating coordinate transformations. To do this, the modeling of the turbine and generator is performed. Therefore, the Maximum Power Point Tracking (MPPT) technology is implemented to extract optimal power at variable wind speed conditions. Subsequently, an explanation of the said command is spread out as well as the principle of adjusting the active and reactive power according to the desired speed. Then, the estimation method of these two control variables will be presented as well as the adopted switching table of the hysteresis controller model used based on the model of the multilevel inverters. Finally, the robustness of the developed system will be analyzed with validation in Matlab / Simulink environment to illustrate the performance of this command.</span>

Optimal tuning of proportional integral controller for fixed-speed wind turbine using grey wolf optimizer

“…In 17- (19) modelled the best positions of α β and δ Wolves while (20) represents the updating of positions of other Wolves from the best positions of α β and δ Wolves [29]. The A and C are variable vectors [30] presented in (21) and (22).…”

“…It is applied to the generator input for producing electrical power. The models representing the wind turbine mechanical power and torque [20][21][22][23] (1)…”

“…In this study, 1 is equal to 0.5176; 2 is equal to 116; 3 is equal to 0.4; 4 is equal to 5; 5 is equal to 21; and 6 is equal to 0.0068. Also, the wind turbine blade tip ratio λ is represented in (4) [20,24].…”

Implementation and Validation of Hybrid Control for a DFIG Wind Turbine Using an FPGA Controller Board

“…However, it suffers from chattering phenomena. Alami et al [8] proposed direct power control (DPC), which is characterized by its detachment from the internal parameters of the machine, but the hysteresis comparators remain the major drawback of this control. To overcome all deficiencies discussed previously, the nonlinear Backstepping approach is chosen based on its performances, simple implementation, and robustness.…”

Improvement of direct torque control applied to doubly fed induction motor under variable speed

“…In this perspective, a complete study of the architecture is proposed in order to elaborate the improved direct control of the torque law [3][4][5]. Then, the whole system is validated under the Matlab / Simulink environment to ensure the efficiency of the control.…”