fayçal Almi - Profile on Academia.edu (original) (raw)
Papers by fayçal Almi
In this paper, we propose a new robust adaptive control scheme for a permanent magnet synchronous... more In this paper, we propose a new robust adaptive control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS), our aim is to ensure maximum power capture in varying wind environments, the proposed control scheme exploits the universal approximation property of fuzzy logic systems (FLS) to adaptively approximate the control law, the hyperbolic tangent function is introduced as a smooth approximation of the sign function to ensure smoothness and robustness against approximation errors. Stability and convergence of the closed loop system are proved using Lyapunov stability theory, numerical simulation is carried out on a typical 3kW PMSG based wind turbine and the results are compared with those found in previous works.
Energy Procedia, 2012
In this paper we propose to investigate, model, optimize and simulate the connection of a 3Kwc do... more In this paper we propose to investigate, model, optimize and simulate the connection of a 3Kwc domestic photovoltaic generator to the three-phase power network throughout a current-controlled voltage source inverter. The current-controlled voltage source inverter tasks are: Tracking the PVG maximum power point. Injecting the maximum power into a three phase electrical network with unit power factor. The totality of the produced energy by the PVG has to be injected in the network, whereas the electricity requirement for domestic use has to be withdrawn from the network supply .This is in order to avoid batteries storage problems .As well as the realization of a decoupling system which can protect the generator from perturbations that can reach the electrical network supply.
Protection of Hybrid (Wind/Photovoltaic) Generator Connected to Mono-Phase Electrical Network Supply
This paper describes the analysis and design of a hybrid (Wind/PV) power system for domestic appl... more This paper describes the analysis and design of a hybrid (Wind/PV) power system for domestic applications connected to mono-phase grid. The connection of a generation system to the utility grid requires a robust phase locked loop (PLL) and continuous detection of utility grid status (such as outage, over-/under-voltage and over-/under frequency).The sizing of this system is mainly based on the price quality factor of the extracted energy. In this design each system is controlled individually to operate in its maximum power point (MPPT). The simulation results and the sensibility analysis show that our generator is able to exploit the complementarity between the two energy sources (wind/ PV) and provides a reliable energy production. It is found that, to obtain grid voltage and grid current at unity power factor, the grid side parameters have to be tuned properly by designing the filter and proper modulation scheme for grid inverter interface.
This paper deals with power control of a wind and solar hybrid generation system for interconnect... more This paper deals with power control of a wind and solar hybrid generation system for interconnection operation with electric distribution system. Power control strategy is to extract the maximum energy available from varying condition of wind speed and solar irradiance while maintaining power quality at a satisfactory level. In order to capture the maximum power, variable speed control is employed for wind turbine and maximum power point tracking is applied for photovoltaic system. The grid interface inverter transfers the energy drawn from the wind turbine and PV array into the grid by keeping common dc voltage constant. To ensure safety these inverters automatically shut down in the event of : High/Low grid AC-voltage; High/Low grid frequency; Grid Failure; or Inverter malfunction. Modeling and simulation study on the entire control scheme is carried out using a power system transient analysis tool, Matlab Simulink. The simulation results show the control performance and dynamic behavior of the wind/PV system.
In this paper a detailed sizing method of stand-alone Photovoltaic–Wind hybrid systems is propose... more In this paper a detailed sizing method of stand-alone Photovoltaic–Wind hybrid systems is proposed and evaluated by the design and the development of flexible software basing on techno-economic analysis and using Object-Oriented Programming. First, a short review of the different sizing programs is given after, a detailed sizing methodology for PV–Wind systems is presented; finally, new software for sizing such systems is conceived. This computer program is building around fundamentals photovoltaic and wind generators models, storage capacity model, Loss of Power Supply Probability (LPSP) algorithm and a proposed techno-economic algorithm to determine the system that would guarantee a reliable energy supply with a lowest investment.
In this paper, we propose a new robust adaptive control scheme for a permanent magnet synchronous... more In this paper, we propose a new robust adaptive control scheme for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS), our aim is to ensure maximum power capture in varying wind environments, the proposed control scheme exploits the universal approximation property of fuzzy logic systems (FLS) to adaptively approximate the control law, the hyperbolic tangent function is introduced as a smooth approximation of the sign function to ensure smoothness and robustness against approximation errors. Stability and convergence of the closed loop system are proved using Lyapunov stability theory, numerical simulation is carried out on a typical 3kW PMSG based wind turbine and the results are compared with those found in previous works.
Energy Procedia, 2012
In this paper we propose to investigate, model, optimize and simulate the connection of a 3Kwc do... more In this paper we propose to investigate, model, optimize and simulate the connection of a 3Kwc domestic photovoltaic generator to the three-phase power network throughout a current-controlled voltage source inverter. The current-controlled voltage source inverter tasks are: Tracking the PVG maximum power point. Injecting the maximum power into a three phase electrical network with unit power factor. The totality of the produced energy by the PVG has to be injected in the network, whereas the electricity requirement for domestic use has to be withdrawn from the network supply .This is in order to avoid batteries storage problems .As well as the realization of a decoupling system which can protect the generator from perturbations that can reach the electrical network supply.
Protection of Hybrid (Wind/Photovoltaic) Generator Connected to Mono-Phase Electrical Network Supply
This paper describes the analysis and design of a hybrid (Wind/PV) power system for domestic appl... more This paper describes the analysis and design of a hybrid (Wind/PV) power system for domestic applications connected to mono-phase grid. The connection of a generation system to the utility grid requires a robust phase locked loop (PLL) and continuous detection of utility grid status (such as outage, over-/under-voltage and over-/under frequency).The sizing of this system is mainly based on the price quality factor of the extracted energy. In this design each system is controlled individually to operate in its maximum power point (MPPT). The simulation results and the sensibility analysis show that our generator is able to exploit the complementarity between the two energy sources (wind/ PV) and provides a reliable energy production. It is found that, to obtain grid voltage and grid current at unity power factor, the grid side parameters have to be tuned properly by designing the filter and proper modulation scheme for grid inverter interface.
This paper deals with power control of a wind and solar hybrid generation system for interconnect... more This paper deals with power control of a wind and solar hybrid generation system for interconnection operation with electric distribution system. Power control strategy is to extract the maximum energy available from varying condition of wind speed and solar irradiance while maintaining power quality at a satisfactory level. In order to capture the maximum power, variable speed control is employed for wind turbine and maximum power point tracking is applied for photovoltaic system. The grid interface inverter transfers the energy drawn from the wind turbine and PV array into the grid by keeping common dc voltage constant. To ensure safety these inverters automatically shut down in the event of : High/Low grid AC-voltage; High/Low grid frequency; Grid Failure; or Inverter malfunction. Modeling and simulation study on the entire control scheme is carried out using a power system transient analysis tool, Matlab Simulink. The simulation results show the control performance and dynamic behavior of the wind/PV system.
In this paper a detailed sizing method of stand-alone Photovoltaic–Wind hybrid systems is propose... more In this paper a detailed sizing method of stand-alone Photovoltaic–Wind hybrid systems is proposed and evaluated by the design and the development of flexible software basing on techno-economic analysis and using Object-Oriented Programming. First, a short review of the different sizing programs is given after, a detailed sizing methodology for PV–Wind systems is presented; finally, new software for sizing such systems is conceived. This computer program is building around fundamentals photovoltaic and wind generators models, storage capacity model, Loss of Power Supply Probability (LPSP) algorithm and a proposed techno-economic algorithm to determine the system that would guarantee a reliable energy supply with a lowest investment.