Enhanced Direct Power Control Strategy of a DFIG-Based Wind Energy Conversion System Operating Under Random Conditions

Abstract

The main objective of this paper is the performances analysis of an Enhanced Direct Power Control (EDPC), applied to Doubly Fed Induction Generator (DFIG) driven by variable speed Wind Turbine (WT). This control strategy uses hysteresis regulators and switching table for active and reactive powers control. These latter are estimated using rotor currents and grid voltages instead of a traditional measurement of stator currents. In addition, the EDPC switching table is based on the position of the rotor flux instead of the stator flux in order to have better regulation accuracy because the rotor voltage vector directly influences the rotor flux and has a proportional relationship with the active and reactive powers. All the operating modes (sub-synchronous, super-synchronous, synchronous and over-speed) of the variable speed WT-DFIG system and the possibility of local reactive power compensation are reported and discussed in this paper. Depending on the operating zone of the WT, Maximum Power Point Tracking (MPPT) technique and pitch angle control are considered to optimize the wind energy efficiency. The validation of the proposed EDPC strategy has been performed through simulation tests under MATALB/Simulink, the obtained results show robustness and good performances with low THD of the generated currents.

Three-Phase Single-Stage Photovoltaic System With Synchronverter Control: Power System Simulation Studies

“…Another grid forming approach is direct power control (DPC), in which output voltage gives the phase angle reference and that is why it is categorized in a grid forming converter [9]- [10]. The enhanced direct power control (EDPC) is proposed in [11], for Doubly Fed Induction Generator (DFIG) driven by variable speed Wind Turbine (WT) application. In this approach, the switching pattern for VSCs is produced from hysteresis control.…”

Hybrid MPPT Control: P&O and Neural Network for Wind Energy Conversion System

“…Several maximum power point (MPP) extraction techniques have been proposed in the literature [24][25][26][27][28][29][30]. It can be divided into indirect and direct MPPT methods [31,32]. The indirect method is based on knowledge of the wind turbine system properties [33].…”

Multilevel Converter and Fuzzy Logic Solutions for Improving Direct Control Accuracy of DFIG-based Wind Energy System

“…Several approaches have recently been taken to increase the DC performances. They are applied to the two-level (2L) back-to-back converter in the DFIG by incorporating other techniques [13]. For the GSC control, several methods have been tested to reduce the variation of the DPC switching frequency [14][15][16].…”