Improved Strategy of an MPPT Based on the Torque Estimator for Variable Speed Turbines

Touati, Abdelwahed; Abdelmounim, Elhassane; Mohamed, Azah; Moutabir, Ahmed; Majdoul, Radouane

doi:10.15866/iremos.v8i6.7122

Cited by 9 publications

(15 citation statements)

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“…In this section, we use the previous equations to simulate both the generator and the controllers. In [23], we had already dealt MPPT system. Thus, in this simulation, we focus on the comparison of the simulation results of the FTSMC technique and the second order sliding mode control.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

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Comparative study between fast terminal and second order sliding mode controls applied to a wind energy conversion system

Touati

Majdoul

Taouni

et al. 2021

IJEECS

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A he wind energy conversion system (WECS) consists of many subsystems, which present control difficulties due to the strong nonlinearities of the models and the effects of internal or external disturbances. In this work, the WECS is based on a doubly feed induction generator (DFIG) directly connected to the stator side network and interconnected via a power converter on the rotor side. The aim of the control strategy is to achieve regular regulation of the powers supplied by the generator and to produce energy of better quality. in order to improve the dynamic behavior of the doubly fed induction generator (DFIG); a comparative study is presented between two advanced control strategies; the second order sliding mode control and the FTSMC fast terminal sliding mode control. The proposed advanced tracking controller is synthesized based on the Lyapunov stability theory and guarantees the existence of the sliding mode around the sliding surface in a finite time. The analysis of the simulation results under the Matlab/Simulink environment confirms the effectiveness of the proposed methods through the performances obtained.

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Section: Simulation Results and Analysismentioning

confidence: 99%

“…In order to test the robustness of the two control laws, a voltage dip is caused between the instants t1= 0.4 s and t2= 0.6 s as shown in Figure 14. In a previous work [23], we had synthesized a DVR system to compensate for voltage drops. The wind speed is kept constant at 24 m/s.…”

Section: Robustness Of Controllersmentioning

confidence: 99%

Comparative study between fast terminal and second order sliding mode controls applied to a wind energy conversion system

Touati

Majdoul

Taouni

et al. 2021

IJEECS

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“…The theory of SOSMC [6,20] is an alternative to the problem of CSMC. In this approach, the term discontinuous no more appears directly in the synthesized control but in one of its superior derivatives, which has the advantage of reducing the chattering.…”

Section: Principle Of Sosmcmentioning

confidence: 99%

“…Second, its capacity to provide variable speed operation means that energy can always be extracted even at low wind speeds and that DFIG rotates at the optimal rotational speed for each wind speed, which minimizes mechanical stress, improves energy quality, and compensates for torque and power pulsations. Finally, the rotor-side converter (RSC) can be controlled to place the turbine system at an operating point where energy extraction is maximal through a technique called 'Maximum Power Point Tracking (MPPT)' [4][5][6][7]. There are several approaches to the transformation of DFIG in the literature to successfully achieve control of the wind system, we find like Stator Voltage Orientation (SVO) [8] and Stator Flux Orientation (SFO) [9], in many cases, these approaches have been successfully combined with linear and non-linear controls like proportionalintegral controller (PIC) [10,11],Classic Sliding Mode Controller (CSMC) [11] and Adaptadtive Backstepping controller(ABC) [12] with High Gain Observer (HGO) [13] to control the DFIG effectively but under stable network conditions.…”

Section: Introductionmentioning

confidence: 99%

“…To remedy this problem a nonlinear control is necessary, we find CSMC is a nonlinear control technique derived from variable structure control system theory used in [11] is robust but its performance is marred by high frequency low oscillations called chattering. An advanced version of the CSMC is the SOSMC using the super-twisting algorithm for its design, which has been proven in [6,20] to be robust against internal disturbances such as parameter variations and system uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Kalman Observer Contribution to a Second Order Sliding Mode Control for Wind Turbine Based on DFIG During the Network Voltage Dip

Loulijat¹,

Ababssi²,

Mohamed³

2021

IJIES

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The main problem of the Doubly-Fed Induction Generator (DFIG) is its sensitivity to network disturbances especially voltage dip due to its stator windings being directly linked to the network. A voltage dip in the network results from high current peaks in the stator windings, since the stator and rotor are electromagnetically coupled, so these peaks provoke inrush current hard at the delicate back-to-back converters and an overcharge of the DC-LINK capacitor. In this perspective, several researchers are realized a linear and nonlinear controller with a passive protection method (PPM). The objective of this paper is to develop modelling and control models based on a true DFIG model considering the effect of all the parameters of a stator winding. The Second-Order Sliding Mode controller (SOSMC) is the non-linear control strategy used to control the dynamics of the DFIG through the rotor-side and network-side power converters under normal network conditions. When a voltage dip is detected, the Kalman observer (KO) contributes to a non-linear controller and the latter is coupled to a passive protection method that contains crowbar and DC-chopper circuits to improve the dynamics of the DFIG system to cross the network fault. Also, a comparative study is carried out between the developed controller and other linear ,non-linear approaches exist in the literature. The results obtained, under a maximum voltage dip (100%) on the 60 kV network, confirm its robustness and superiority in terms of limiting the DFIG graders at the beginning and on termination of a fault. In terms of Ir and Vdc values during a voltage dip, our control strategy does not exceed 1.45p.u and 1.2p.u, on the contrary, the ABC with HGO which is developed recently reaches 2.2p.u and 0.4p.u.

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Improvement of the Non-linear Control Strategy of a Wind Turbine by a High-Gain Observer

Loulijat

Ababssi

Mohamed

2021

Digital Technologies and Applications

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Improved Strategy of an MPPT Based on the Torque Estimator for Variable Speed Turbines

Cited by 9 publications

References 0 publications

Comparative study between fast terminal and second order sliding mode controls applied to a wind energy conversion system

Comparative study between fast terminal and second order sliding mode controls applied to a wind energy conversion system

Kalman Observer Contribution to a Second Order Sliding Mode Control for Wind Turbine Based on DFIG During the Network Voltage Dip

Improvement of the Non-linear Control Strategy of a Wind Turbine by a High-Gain Observer

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