Improved dfig dftc by using a fractional-order super twisting algorithms in wind power application

Abstract

Background: The direct flux and torque control are a robust, simple, and alternative approach control formulation that does not require decomposition into symmetrical components; the direct flux and torque control schemes have been proved to be preponderant for doubly-fed induction generators due to the simple implementation.
 Aim: This work presents the minimization of electromagnetic torque and rotor flux undulations of doubly-fed induction generators using fractional-order super twisting algorithms and modified space vector modulation techniques.
 Methods: The main role of direct flux and torque control is to regulate and control the electromagnetic torque and rotor flux of doubly-fed induction generators for wind turbine systems. The direct flux and torque control is a traditional control algorithm and robust technique. Fractional-order super twisting algorithms are a new and proposed nonlinear controller; characterized by a robust controller and a simpler algorithm, which gives a good harmonic distortion of current compared to other methods.
 Novelty: The A fractional-order super twisting algorithm is proposed. Proposed nonlinear controller construction is based on the traditional super twisting algorithm and fractional calculus to obtain a robust controller and reduces the electromagnetic torque and rotor flux undulations of doubly-fed induction generators. We use in our study a 1.5 MW doubly-fed induction generator integrated into a single-rotor wind turbine system to minimizes the electromagnetic torque, stator current, rotor flux undulations. As shown in the results figures using fractional-order super twisting algorithms ameliorate effectiveness especially minimizes the electromagnetic torque and rotor flux, and minimizes harmonic distortion of stator current (0.16 %) compared to the traditional control scheme.
 Results: As shown in the results figures using fractional-order super twisting algorithms ameliorate effectiveness especially minimizes the electromagnetic torque and rotor flux, and minimizes harmonic distortion of stator current (0.16 %) compared to the traditional control scheme.
 Conclusion: The direct flux and torque control are a robust, simple, and alternative approach control formulation that does not require decomposition into symmetrical components; the direct flux and torque control schemes have been proved to be preponderant for doubly-fed induction generators due to the simple implementation.

Robust Neural Control of Wind Turbine Based Doubly Fed Induction Generator and NPC Three Level Inverter

“…We present in preferred way the dynamics electrical model of the DFIG-generator in a synchronous reference frame (d, q) rotating at an angular speed of ω s . According to [14][15][16][17][18][19][20][21][22][23], the basic equations used to model the DFIG-generators in the rotating d-q reference frame are written as [24][25][26]:…”

“…The stator and rotor flux are expressed by [4,5]: where: R s , R r , L s and L r are respectively the resistance and inductance of the stator and the rotor; M is the mutual inductance, I sd , I sq , I rd , I rq represent the d and q components of the stator and rotor currents; ω s is the stator angular frequency (ω r = ω s −P Ω mec ); ω r is rotor angular frequency, and P number of pole pairs. Equation (11) represents the expression of electromagnetic torque [2,9,[26][27][28]:…”

“…The working reference for the control is that related to the rotating field so that the axis (𝑑) coincides with the direction desired flow, which can be rotor, stator, or air gap. Thus, it is possible to orient the different flows of the machine [3,[17][18][19][20][21][22][23][24][25][26][27][28][29].…”

“…( 21) active and reactive powers can be controlled via rotor currents. That is why we call this approach indirect method [25][26][27][28][29].…”

Amelioration Effectiveness of Torque and Rotor Flux Control Applied to the Asynchronous Generator for Dual-rotor Wind Turbine using Neural Third-order Sliding Mode Approaches

“…However, the proposed DTC with third-order sliding mode is simple to control, easy to implement, robust algorithm, and reduces the THD value of stator current and power ripple compared to the DTC strategy with PI controllers. Fractional-order second-order continuous sliding mode approach was proposed to improve the characterisitics of DTC control with a modified SVM technique to control the asynchronous generator-based wind turbine [31]. The proposed nonlinear DTC control is more robust than classical DTC with a modified SVM technique.…”