scholarly journals Performance improvement of the variable speed wind turbine driving a DFIG using nonlinear control strategies

2021 ◽  
Vol 12 (4) ◽  
pp. 2470
Author(s):  
Chojaa Hamid ◽  
A. Derouich ◽  
T. Hallabi ◽  
O. Zamzoum ◽  
M. Taoussi ◽  
...  
Keyword(s):  
Sliding Mode ◽  
Control Strategies ◽  
Dynamic Performance ◽  
Harmonic Distortion ◽  
Maximum Power ◽  
Control Approach ◽  
Pi Regulator ◽  
Point Tracking ◽  
Power Point ◽  
Doubly Fed

In this research paper, a nonlinear Backstepping controller has been proposed in order to improve the dynamic performance of a doubly fed induction generator (DFIG) based Wind Energy conversion System, connected to the grid through a back-to-back converter. Firstly, an overall modeling of proposed system has been presented. Thereafter, three control techniques namely backstepping (BSC), sliding mode (SMC) and field-oriented control (FOC) using a conventional PI regulator have been designed in order to control the stator active and reactive powers of the DFIG. In addition, the maximum power point tracking (MPPT) strategy has been investigated in this work with three mechanical speed controllers: BSC, SMC and PI controller with the aim of making a synthesis and a comparison between their performances to determine which of those three techniques is more efficient to extract the maximum power. Finally, a thorough comparison between the adopted techniques for the DFIG control has been established in terms of response time, rise time, total harmonic distortion THD (%) of the stator current, static errors and robustness. The effectiveness and robustness of each control approach has been implemented and tested under MATLAB/Simulink environment by using a 1.5 MW wind system model.

scholarly journals Sliding Mode Controllers for Standalone PV Systems: Modeling and Approach of Control

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Y. Chaibi ◽  
M. Salhi ◽  
A. El-jouni
Keyword(s):  
Sliding Mode ◽  
Electrical Energy ◽  
Maximum Power ◽  
Output Current ◽  
Pv System ◽  
Maximum Power Point ◽  
Control Approach ◽  
Point Tracking ◽  
Current Controller ◽  
Power Point

This paper presents a single-phase standalone photovoltaic (PV) system with two stages of converters. The aim of this work is to track the maximum power point (MPP) so as to transfer the maximum available power to the load and to control the output current in order to feed the AC load by a sinusoidal current. These goals are attained by using the sliding mode to design control laws in order to command the boost DC-DC and the inverter switches. Thus, a maximum power point tracking (MPPT) and an output current controller based on the sliding mode are proposed. The innovative aspect of this work is to propose a standalone PV system with the controllers based only on the sliding mode control approach. The proposed system is modeled and simulated under MATLAB Simulink under fast variations of irradiance and temperature. Then, the obtained results using the suggested MPPT are compared to those using the incremental conductance (IC) method. These results demonstrate the superiority of the sliding mode MPPT in terms of the tracking speed, the efficiency, and the time of response. Moreover, the current controller provides an output current of high quality with a THD of 3.47%. Furthermore, for accurate results, these controllers are evaluated under the fluctuations of two daily climatic profiles (sunny and cloudy) and compared those of the IC method. The results illustrate that the sliding mode MPPT has the potential of generating more electrical energy than the IC MPPT with benefits of up to 13.02% for the sunny daily profile and 27.57% for the cloudy one.

scholarly journals Robust maximum power point tracking control for photovoltaic system based on second order sliding-mode

2020 ◽  
Vol 9 (3) ◽  
pp. 284
Author(s):  
A. Fezzani ◽  
N. Bouarroudj ◽  
S. Drid ◽  
L. Zaghba
Keyword(s):  
Sliding Mode ◽  
Maximum Power Point Tracking ◽  
Second Order ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Control Approach ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
Second Order Sliding Mode

<div data-canvas-width="397.1720469663374">This paper proposes a control approach of a maximum power point of a photovoltaic (PV) system using the second order sliding mode approach. The main objective of the proposed paper is to track the maximum power point (MPP) using super twisting algorithm (STA) with a one-loop control method and augment efficiency of the output power system. The structure of a proposed approach is simple and robust aging the atmospheric changes. Such control approach solution has several advantages such as simple implementation, robustness; reduce the chattering phenomenon and good dynamic response compared to traditional first-order sliding mode control algorithm. The controller circuit adapts the duty cycle of the switch electronic device of the DC/DC converter to search maximum power point tracking as a function of evolution of the power input. The effectiveness and feasibility of the proposed control are verified by simulation in MATLAB /Simulink environment and dSPACE-based hardware in loop platform.</div>

scholarly journals Fixed- and variable-frequency sliding mode controller–maximum power point tracking converter for two-stage grid-integrated photovoltaic system employing nonlinear loads with power quality improvement features

2019 ◽  
Vol 52 (7-8) ◽  
pp. 896-912
Author(s):  
Ravichandran Chinnappan ◽  
Premalatha Logamani ◽  
Rengaraj Ramasubbu
Keyword(s):  
Sliding Mode ◽  
Maximum Power Point Tracking ◽  
Active Power Filter ◽  
Maximum Power ◽  
Sliding Mode Controller ◽  
Maximum Power Point ◽  
Power Filter ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

This article presents a reliable and efficient photovoltaic sliding mode voltage-controlled maximum power point tracking DC-DC converter–active power filter integration system to supply real power to grid. This integrated active power filter system performs power quality enhancement features to compensate current harmonics to make distortion-free grid supply current and reactive power employing nonlinear loads. The proposed proportional–integral–derivative–based sliding mode controller is designed with fixed-frequency pulse-width modulation based on equivalent control approach. The main objective of this paper is to design a photovoltaic system with a new sliding surface to force the photovoltaic voltage to follow the reference maximum power point voltage with the alleviation of slow transient response and disadvantages of chattering effects of variable-frequency hysteresis modulation sliding mode controller–maximum power point tracking. The perturbations caused by the uncertainties in climatic conditions and converter output bulk oscillations during grid integration are also mitigated. The features of the proposed photovoltaic–active power filter integration system are confirmed at different operating conditions through PSIM simulation software, and its performance is also compared with a conventional variable-frequency sliding mode-controlled maximum power point tracking. The obtained simulation and experimental results give good dynamic response under various operating conditions of environmental and local load conditions.

Fuzzy Logic Controller for Cascaded H-Bridge Multilevel Inverter

2015 ◽  
Vol 4 (3) ◽  
pp. 105
Author(s):  
N. Sivakumar ◽  
A. Sumathi
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Harmonic Distortion ◽  
Tracking Algorithm ◽  
Maximum Power ◽  
Total Harmonic Distortion ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point

This paper proposes fuzzy logic controller based seven-level hybrid inverter for photovoltaic systems with sinusoidal pulse width-modulation (SPWM) techniques. Multi-Level Inverter technology have been developed in the area of high-power medium-voltage energy scheme, because of their advantages such as devices of high dv/dt rating, higher switching frequency, unlimited power processing, shape of output waveform and desired level of output voltage, current and frequency adjustment.This topology can be used there by enabling the scheme to reduce the Total Harmonic Distortion (THD) for high voltage applications. The Maximum Power Point Tracking algorithm is also used for extracting maximum power from the PV array connected to each DC link voltage level. The Maximum Power Point Tracking algorithm is solved by Perturb and Observer method.It has high performance with low Total Harmonic Distortion and reduced by this control strategy. The proposed system has verified and THD is obtained by using MATLAB/simulink.The result is compared with the hardware prototype working model.

Sign in / Sign up

Export Citation Format

Share Document