scholarly journals Novel Nonlinear Control and Optimization Strategies for Hybrid Renewable Energy Conversion System

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Z. Jai Andaloussi ◽  
A. Raihani ◽  
A. El Magri ◽  
R. Lajouad ◽  
A. El Fadili
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Control Strategy ◽  
Reactive Power ◽  
Sliding Mode ◽  
Voltage Regulation ◽  
Lyapunov Theory ◽  
Conversion System ◽  
Energy Conversion System ◽  
Hybrid Renewable Energy

This article deals with a hybrid renewable energy conversion system (HRECS) interconnected to the three-phase grid in association with their power conversion components, i.e., AC/DC rectifier and DC/AC inverter. The HRECS is built around a permanent magnet synchronous wind turbine generator and a photovoltaic energy conversion system. Comparing to traditional control methods, a new multiobjective control strategy is developed to enhance system performances. This makes it possible to account in addition to optimal turbine speed regulation and PV-MPPT and three other important control objectives such as DC-link voltage regulation and the injected reactive power in the grid. To achieve these objectives, a novel control strategy is developed, based on a nonlinear model of the whole “converters-generators” association. The robustness and the stability analysis of the system have been proved using the Lyapunov theory and precisely the backstepping control and the sliding mode control. The performances of the proposed controllers are formally analyzed with respect to standard control solutions illustrated through simulation.

scholarly journals A non-linear control strategy for a PV conversion system with energy storage

2021 ◽  
Vol 297 ◽  
pp. 01023
Author(s):  
Ghizlane Traiki ◽  
Abdelmounime El Magri ◽  
Rachid Lajouad ◽  
Omar Bouattane
Keyword(s):  
Energy Storage ◽  
Energy Conversion ◽  
Control Strategy ◽  
Sliding Mode ◽  
Maximum Power ◽  
Parameter Uncertainties ◽  
Control Approach ◽  
Power Extraction ◽  
Conversion System ◽  
Energy Conversion System

A nonlinear control of a PV Energy Conversion System (PVECS) with energy storage system and maximum power extraction is presented. The control strategy is designed in two steps. Firstly, a MPPT algorithm is designed to tracking the maximum power point in variable irradiations, battery state of charge (SOC) and load changes. Then, thanks to its many advantages such as simplicity against parameter uncertainties, a Sliding Mode Control approach (SMC) is applied to control the standalone PV energy conversion system. Finally, the performances of MPPT techniques and SMC controller in the closed loop are checked using the MATLAB/SIMULINK.

scholarly journals Nonlinear control of grid-connected wind energy conversion system without mechanical variables measurements

2021 ◽  
Vol 12 (2) ◽  
pp. 1139
Author(s):  
Karim Noussi ◽  
Abdelmajid Abouloifa ◽  
Hanane Katir ◽  
Ibtissam Lachkar ◽  
Fouad Giri
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Reactive Power ◽  
Sliding Mode ◽  
High Gain ◽  
Wind Energy Conversion System ◽  
Wind Energy Conversion ◽  
Conversion System ◽  
Energy Conversion System ◽  
Grid Side

This article addresses the problem of controlling an overall wind energy conversion system (WECS) formed by a wind turbine connected to the grid via a doubly fed introduction generator (DFIG) and an AC/DC/AC converter. The main control objectives are fourfold: (i) designing an output feedback speed controller that makes the DFIG rotate at the optimal value delivered by the MPPT strategy, (ii) controlling the stator reactive power so as to be null, (iii) guaranteeing the DC-link voltage in the grid side converter to be at a given constant value, (iv) ensuring a unitary power factor. A high gain observer is synthesized, in order to provide estimated values of the mechanical variables. To achieve the control objectives, a sliding mode controller involving the mechanical observer is designed. The performance of the system configuration based on the 2MW-DFIG with the proposed controller is evaluated by a numerical simulation under a realistic wind profile using MATLAB/SIMULINK/SimPowerSystems environment.

Study on Mechanical Automation with Simulation of Wind Energy Conversion System Based on Sliding Mode Control

2013 ◽  
Vol 738 ◽  
pp. 227-230
Author(s):  
San Tang ◽  
Wu Wang
Keyword(s):  
Sliding Mode Control ◽  
Energy Conversion ◽  
Wind Power ◽  
Control Strategy ◽  
Sliding Mode ◽  
Wind Energy Conversion System ◽  
Wind Energy Conversion ◽  
Mode Control ◽  
Conversion System ◽  
Energy Conversion System

The exploitation of wind power will improve the energy structure and ease the power shortage, which is an effective approach to solving the world energy crisis. But the wind power generation system was a typical nonlinear system, which was hard to be controlled exactly by traditional controllers and the sliding mode control was proposed, the mathematical models of wind energy conversion system was created, which was combined with mechanical automation and electrical, the sliding mode control strategy was presented, the sliding surface was designed with equivalent controller and switching controller. The model and control strategy was established with MATLAB and the simulation result shows this control system with speed tracking performance, which can effectively implement maximum energy capture.

scholarly journals Modeling and Coordinated Control Strategy of Large Scale Grid-Connected Wind/Photovoltaic/Energy Storage Hybrid Energy Conversion System

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Lingguo Kong ◽  
Guowei Cai ◽  
Sidney Xue ◽  
Shaohua Li
Keyword(s):  
Energy Storage ◽  
Energy Conversion ◽  
Hybrid System ◽  
Control Strategy ◽  
Large Scale ◽  
Coordinated Control ◽  
Hybrid Energy ◽  
Conversion System ◽  
Energy Conversion System ◽  
Continuous Power

An AC-linked large scale wind/photovoltaic (PV)/energy storage (ES) hybrid energy conversion system for grid-connected application was proposed in this paper. Wind energy conversion system (WECS) and PV generation system are the primary power sources of the hybrid system. The ES system, including battery and fuel cell (FC), is used as a backup and a power regulation unit to ensure continuous power supply and to take care of the intermittent nature of wind and photovoltaic resources. Static synchronous compensator (STATCOM) is employed to support the AC-linked bus voltage and improve low voltage ride through (LVRT) capability of the proposed system. An overall power coordinated control strategy is designed to manage real-power and reactive-power flows among the different energy sources, the storage unit, and the STATCOM system in the hybrid system. A simulation case study carried out on Western System Coordinating Council (WSCC) 3-machine 9-bus test system for the large scale hybrid energy conversion system has been developed using the DIgSILENT/Power Factory software platform. The hybrid system performance under different scenarios has been verified by simulation studies using practical load demand profiles and real weather data.

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