The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural ar... more The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural areas where access to the grid is restricted. In this application, photovoltaic (PV) and pump system regulation are crucial to increase its overall efficiency. In this context, this work presents a simple and efficient off-grid SPV water pumping system (SPVWPS). The designed system is based on a DC-DC boost converter, a three-phase DC-AC inverter, and a three-phase induction motor (IM) coupled to the centrifugal pump. The proposed solution is operated using a control strategy that associates an improved fractional open-circuit voltage (FOCV) method for maximum power point tracking (MPPT) and closed-loop scalar control. This association avoids the use of a speed sensor/encoder and a current sensor for the IM. Finally, the effectiveness of the proposed off-grid SPVWPS and its control system for both steady-state and dynamic conditions of insolation change is verified using a 1KVA rated proto...
In this paper, a new design of a real-time low-cost speed monitoring and closed-loop control of t... more In this paper, a new design of a real-time low-cost speed monitoring and closed-loop control of the three-phase induction motor (IM) is proposed. The proposed solution is based on a voltage/frequency (V/F) control approach and a PI antiwindup regulator. It uses the Waijung Blockset which considerably alleviates the heaviness and the difficulty of the microcontroller’s programming task incessantly crucial for the implementation and the management of such complex applications. Indeed, it automatically generates C codes for many types of microcontrollers like the STM32F4 family, also used in this application. Furthermore, it offers a cost-effective design reducing the system components and increasing its efficiency. To prove the efficiency of the suggested design, not only simulation results are carried out for a wide range of variations in load and reference speed but also experimental assessment. The real-time closed-loop control performances are proved using the aMG SQLite Data Serv...
Speed sensorless control schemes have potential benefits for industrial applications because they... more Speed sensorless control schemes have potential benefits for industrial applications because they contribute to reducing process cost and they avoid using fragile sensors as encoders or resolvers in hostile environment. In addition, simplicity, reliability, and fast response of control structures to signal commands are much-needed features. In this paper, a new Speed Sensorless Direct Control (SSDC) technique allowing the achievement of these objectives is proposed. This technique combines Field Oriented Control (FOC) and Direct Torque Control (DTC) properties in the same approach. The estimated speed is reached only according to the measured current and voltage of the stator. DTC is extended to speed sensorless direct control with any notable modification. The proposed scheme is implemented to the induction machine benchmark and evaluated in real time under various possible scenarios of use. Experimental results show that the proposed SSDC has interesting capabilities to conduct in...
ABSTRACT To increase the output efficiency of a photovoltaic (PV) system, it is important to appl... more ABSTRACT To increase the output efficiency of a photovoltaic (PV) system, it is important to apply an efficient maximum power point tracking (MPPT) technique. This paper describes the analysis, the design and the experimental implementation of the tracking methods for a standalone PV system, using two approaches. The first one is the constant voltage (CV) MPPT method based on the optimum voltage, which was deduced experimentally, and considered as a reference value to extract the optimum power. The second one is the increment conductance (Inc- Cond) MPPT method based on the calculation of the power derivative extracted by the installation. The output controller can adjust the duty ratio to the optimum value. This optimum duty ratio is the input of a DC/DC boost converter which feeds a set of Moto-pump via a DC/AC inverter. This paper presents the details of the two approaches implemented, based on the system performance characteristics. Contributions are made in several aspects of the system, including converter design, system simulation, controller programming, and experimental setup. The MPPT control algorithms implemented extract the maximum power point (MPP), with satisfactory performance and without steady-state oscillation. MATLAB/Simulink and dSpace DS1104 are used to conduct studies and implement algorithms. The two proposed methods have been validated by implementing the performance of the PV pumping systems installed on the roof of the research laboratory in INSAT Tunisia. Experimental results verify the feasibility and the improved functionality of the system.
2014 IEEE 11th International Multi-Conference on Systems, Signals & Devices (SSD14), 2014
ABSTRACT Maximum power point trackers (MPPTs) play a vital role in photovoltaic (PV) systems beca... more ABSTRACT Maximum power point trackers (MPPTs) play a vital role in photovoltaic (PV) systems because they increase the efficiency of the solar photovoltaic system by increasing the power output. MPPT algorithms are necessary because PV arrays have a non linear voltage-current characteristic with a unique point where the power produced is maximum. The output power from the solar panel varies with solar irradiance, temperature and load. In this paper, we present different performances of a photovoltaic (PV) water pumping system. A prototype of experimental bench in installed in the laboratory of INSAT Tunisia. This paper presents the design and implementation of perturb& observe (P&O) MPPT algorithm which is responsible for driving the dc-dc boost converter to track maximum power point (MPP). And thereafter feeds a pump through a DC/AC inverter. For the best electrical and mechanical performance, all components of the solar pumping system are carefully matched. Correct sizing of the pump, motor and controlling devices, will allow the system to operate at the highest efficiency to ensure economical water pumping. The obtained experimental results illustrated by curves are represented and analyzed.
2014 5th International Renewable Energy Congress (IREC), 2014
ABSTRACT Analog Maximum Power Point Tracking (MPPT) controller circuit for photovoltaic (PV) sola... more ABSTRACT Analog Maximum Power Point Tracking (MPPT) controller circuit for photovoltaic (PV) solar system is an attractive solution due to its low cost and capability of easy integration with a normal DC/DC controller in several application like PV pumping system. This paper deals with this subject and presents an analog circuit that utilizes the coordinates of MPP to achieve maximum output power from the solar panel. The proposed controller can find the real MPP dynamically under different weather condition and its operation is depending on best choice of reference value such optimal voltage or current. The tracking performance of the proposed controller has been validated by experimental results using a test bench composed by 500 W PV panels connected to induction motor-centrifugal pump through DC/DC boost converter, three phases DC/AC converter and DSP card used as interface for command of DC/AC inverter and results registration.
7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014
ABSTRACT This paper presents a development and implementation of a simple but efficient photovolt... more ABSTRACT This paper presents a development and implementation of a simple but efficient photovoltaic water pumping system. The system employs maximum power point tracker (MPPT), is composed of PV generator, DC-DC boost converter, DC-AC converter, induction motor and centrifugal pump. Two MPPT algorithms, constant voltage and short-current pulse methods will be modeled and implemented in dspace environment for practical evaluation. Each model is responsible for driving the dc-dc boost converter to track maximum power point (MPP) by instantaneous digitally control of duty ratio which respect different weather conditions. The effectiveness and higher efficiency of the proposed MPPT schemes is demonstrated experimentally under various operating conditions.
Frontiers of Energy and Power Engineering in China, 2010
This paper presents the development of a test bench dedicated for electrical machines and energy ... more This paper presents the development of a test bench dedicated for electrical machines and energy control, as realized by the research team of the Power Systems and Electrical Machines Laboratory (RME) of the National Institute of Applied Sciences and Technology (INSAT) in Tunisia. The principal components of the proposed test bench are explained, and the respective characteristics are given. This
Frontiers of Energy and Power Engineering in China, 2010
This paper presents the development of a test bench dedicated for electrical machines and energy ... more This paper presents the development of a test bench dedicated for electrical machines and energy control, as realized by the research team of the Power Systems and Electrical Machines Laboratory (RME) of the National Institute of Applied Sciences and Technology (INSAT) in Tunisia. The principal components of the proposed test bench are explained, and the respective characteristics are given. This
The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural ar... more The main application of off-grid solar photovoltaic (SPV) systems is water extraction in rural areas where access to the grid is restricted. In this application, photovoltaic (PV) and pump system regulation are crucial to increase its overall efficiency. In this context, this work presents a simple and efficient off-grid SPV water pumping system (SPVWPS). The designed system is based on a DC-DC boost converter, a three-phase DC-AC inverter, and a three-phase induction motor (IM) coupled to the centrifugal pump. The proposed solution is operated using a control strategy that associates an improved fractional open-circuit voltage (FOCV) method for maximum power point tracking (MPPT) and closed-loop scalar control. This association avoids the use of a speed sensor/encoder and a current sensor for the IM. Finally, the effectiveness of the proposed off-grid SPVWPS and its control system for both steady-state and dynamic conditions of insolation change is verified using a 1KVA rated proto...
In this paper, a new design of a real-time low-cost speed monitoring and closed-loop control of t... more In this paper, a new design of a real-time low-cost speed monitoring and closed-loop control of the three-phase induction motor (IM) is proposed. The proposed solution is based on a voltage/frequency (V/F) control approach and a PI antiwindup regulator. It uses the Waijung Blockset which considerably alleviates the heaviness and the difficulty of the microcontroller’s programming task incessantly crucial for the implementation and the management of such complex applications. Indeed, it automatically generates C codes for many types of microcontrollers like the STM32F4 family, also used in this application. Furthermore, it offers a cost-effective design reducing the system components and increasing its efficiency. To prove the efficiency of the suggested design, not only simulation results are carried out for a wide range of variations in load and reference speed but also experimental assessment. The real-time closed-loop control performances are proved using the aMG SQLite Data Serv...
Speed sensorless control schemes have potential benefits for industrial applications because they... more Speed sensorless control schemes have potential benefits for industrial applications because they contribute to reducing process cost and they avoid using fragile sensors as encoders or resolvers in hostile environment. In addition, simplicity, reliability, and fast response of control structures to signal commands are much-needed features. In this paper, a new Speed Sensorless Direct Control (SSDC) technique allowing the achievement of these objectives is proposed. This technique combines Field Oriented Control (FOC) and Direct Torque Control (DTC) properties in the same approach. The estimated speed is reached only according to the measured current and voltage of the stator. DTC is extended to speed sensorless direct control with any notable modification. The proposed scheme is implemented to the induction machine benchmark and evaluated in real time under various possible scenarios of use. Experimental results show that the proposed SSDC has interesting capabilities to conduct in...
ABSTRACT To increase the output efficiency of a photovoltaic (PV) system, it is important to appl... more ABSTRACT To increase the output efficiency of a photovoltaic (PV) system, it is important to apply an efficient maximum power point tracking (MPPT) technique. This paper describes the analysis, the design and the experimental implementation of the tracking methods for a standalone PV system, using two approaches. The first one is the constant voltage (CV) MPPT method based on the optimum voltage, which was deduced experimentally, and considered as a reference value to extract the optimum power. The second one is the increment conductance (Inc- Cond) MPPT method based on the calculation of the power derivative extracted by the installation. The output controller can adjust the duty ratio to the optimum value. This optimum duty ratio is the input of a DC/DC boost converter which feeds a set of Moto-pump via a DC/AC inverter. This paper presents the details of the two approaches implemented, based on the system performance characteristics. Contributions are made in several aspects of the system, including converter design, system simulation, controller programming, and experimental setup. The MPPT control algorithms implemented extract the maximum power point (MPP), with satisfactory performance and without steady-state oscillation. MATLAB/Simulink and dSpace DS1104 are used to conduct studies and implement algorithms. The two proposed methods have been validated by implementing the performance of the PV pumping systems installed on the roof of the research laboratory in INSAT Tunisia. Experimental results verify the feasibility and the improved functionality of the system.
2014 IEEE 11th International Multi-Conference on Systems, Signals & Devices (SSD14), 2014
ABSTRACT Maximum power point trackers (MPPTs) play a vital role in photovoltaic (PV) systems beca... more ABSTRACT Maximum power point trackers (MPPTs) play a vital role in photovoltaic (PV) systems because they increase the efficiency of the solar photovoltaic system by increasing the power output. MPPT algorithms are necessary because PV arrays have a non linear voltage-current characteristic with a unique point where the power produced is maximum. The output power from the solar panel varies with solar irradiance, temperature and load. In this paper, we present different performances of a photovoltaic (PV) water pumping system. A prototype of experimental bench in installed in the laboratory of INSAT Tunisia. This paper presents the design and implementation of perturb& observe (P&O) MPPT algorithm which is responsible for driving the dc-dc boost converter to track maximum power point (MPP). And thereafter feeds a pump through a DC/AC inverter. For the best electrical and mechanical performance, all components of the solar pumping system are carefully matched. Correct sizing of the pump, motor and controlling devices, will allow the system to operate at the highest efficiency to ensure economical water pumping. The obtained experimental results illustrated by curves are represented and analyzed.
2014 5th International Renewable Energy Congress (IREC), 2014
ABSTRACT Analog Maximum Power Point Tracking (MPPT) controller circuit for photovoltaic (PV) sola... more ABSTRACT Analog Maximum Power Point Tracking (MPPT) controller circuit for photovoltaic (PV) solar system is an attractive solution due to its low cost and capability of easy integration with a normal DC/DC controller in several application like PV pumping system. This paper deals with this subject and presents an analog circuit that utilizes the coordinates of MPP to achieve maximum output power from the solar panel. The proposed controller can find the real MPP dynamically under different weather condition and its operation is depending on best choice of reference value such optimal voltage or current. The tracking performance of the proposed controller has been validated by experimental results using a test bench composed by 500 W PV panels connected to induction motor-centrifugal pump through DC/DC boost converter, three phases DC/AC converter and DSP card used as interface for command of DC/AC inverter and results registration.
7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014), 2014
ABSTRACT This paper presents a development and implementation of a simple but efficient photovolt... more ABSTRACT This paper presents a development and implementation of a simple but efficient photovoltaic water pumping system. The system employs maximum power point tracker (MPPT), is composed of PV generator, DC-DC boost converter, DC-AC converter, induction motor and centrifugal pump. Two MPPT algorithms, constant voltage and short-current pulse methods will be modeled and implemented in dspace environment for practical evaluation. Each model is responsible for driving the dc-dc boost converter to track maximum power point (MPP) by instantaneous digitally control of duty ratio which respect different weather conditions. The effectiveness and higher efficiency of the proposed MPPT schemes is demonstrated experimentally under various operating conditions.
Frontiers of Energy and Power Engineering in China, 2010
This paper presents the development of a test bench dedicated for electrical machines and energy ... more This paper presents the development of a test bench dedicated for electrical machines and energy control, as realized by the research team of the Power Systems and Electrical Machines Laboratory (RME) of the National Institute of Applied Sciences and Technology (INSAT) in Tunisia. The principal components of the proposed test bench are explained, and the respective characteristics are given. This
Frontiers of Energy and Power Engineering in China, 2010
This paper presents the development of a test bench dedicated for electrical machines and energy ... more This paper presents the development of a test bench dedicated for electrical machines and energy control, as realized by the research team of the Power Systems and Electrical Machines Laboratory (RME) of the National Institute of Applied Sciences and Technology (INSAT) in Tunisia. The principal components of the proposed test bench are explained, and the respective characteristics are given. This
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