2018 5th International Conference on Renewable Energy: Generation and Applications (ICREGA), 2018
Design of a mini prototype wave energy converter (WEC) system is considered in this paper. The pr... more Design of a mini prototype wave energy converter (WEC) system is considered in this paper. The prototype is based on permanent magnet linear generator (PMLG) with planar structure. The main objective of this work is to create a simple and low cost prototype of WEC system for study and teaching purposes. In the design procedure, optimization of the detailed parameters to obtain the output power with the barrier of physical dimensions is considered. The PMLG is combined with a linear actuator based on DC motor, sensors and data acquisition devices to represent a WEC system. The experimental test is performed to investigate the efficiency of the designed PMLG.
When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected t... more When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected to bypass diodes, a partial shading condition (PSC) occurs, which causes a global maximum power point (GMPP) and numerous local maximum power points (LMPPs) on the power-voltage (P-V) curve. Unlike conventional MPPT techniques that search for multiple LMPPs on the P-V curve, it is possible to track GMPP straightaway by designing a simple but robust MPPT technique that results in faster tracking speed and low power oscillations. Hence, in this study, an improved proportional-integral (PI) coordinated Maximum Power Point Tracking (MPPT) algorithm is designed to enhance the conversion efficiency of a PV system under PSC with fast-tracking speed and reduced power oscillations. Here, PI controllers are used to mitigating the steady-state errors of output voltage and current of PV system that later on passed through an incremental conductance (INC) algorithm to regulate the duty cycle of a dc–d...
Enhancing electrical power conversion of Wave Energy Converters (WECs) is a continuous research a... more Enhancing electrical power conversion of Wave Energy Converters (WECs) is a continuous research area. A variety of electrical circuits topologies have been considered, including passive and active topologies. In this paper, we propose a simple, inexpensive and efficient that combines a conventional six pulse rectifier with resonance phenomena. Electrical resonance was achieved by adding shunt capacitors between the rectifiers diodes. Capacitors value was selected based on dominant electrical frequency which, in turn, governed by the velocity of the translator of the Permanent Magnet Linear Generator (PMLG). The proposed circuit increased the output power and reduced harmonics compared to another resonance topology. Besides, the behaviour of the closed loop WEC system, including hydrodynamic interactions, was also simulated. The new resonance configuration resulted in a wider bandwidth with respect to sea state.
2018 5th International Conference on Renewable Energy: Generation and Applications (ICREGA), 2018
Design of a small scale wave energy converter (WEC) based on linear hydraulic system is considere... more Design of a small scale wave energy converter (WEC) based on linear hydraulic system is considered in this paper. The prototype consists of low speed rotary permanent magnet generator, hydraulic motor, accumulator, valves and pistons. It is incorporated with sensors, data acquisition and monitoring devices, and various mechanical components to create a WEC system and conduct the experiment (dry test). The test is conducted to show the performance and efficiency of the designed system. Additionally, another experiment is performed to check the conversion efficiency of the machine.
This article presents the design methodology of an alternative approach for implementing proporti... more This article presents the design methodology of an alternative approach for implementing proportional-resonant (PR) controller for single-phase grid-tied inverter. The developed PR controller is designed to regulate the grid current with the aim of controlling either the dc-link voltage or the active/reactive power injected into the grid. The control design is based on combining a state feedback controller with a disturbance observer. It turns out that the composite controller can be expressed as a PR controller plus an antiwindup scheme. The latter is required by the resonant portion of the PR controller to attenuate the effect of the control input saturation during transients. On the other hand, when the voltage harmonics are taken into account in the observer design, the composite controller reduces to multiple resonant controllers with an antiwindup scheme. The performance of the existing PR controller was investigated under control saturation to highlight the poor transient performances associated with modulating signal limitation. Experimental tests have been conducted to verify the the performance of the proposed controller. The obtained results demonstrated good transient performances compared with the existing PR controller, particularly during control saturation. Furthermore, performance results under voltage harmonics showed that the proposed controller can achieve accurate control of the current with low total harmonic distortion values.
International Journal of Robotics and Mechatronics, 2015
There are many advantages for having collaborative flight of multiple Unmanned Arial Vehicles (UA... more There are many advantages for having collaborative flight of multiple Unmanned Arial Vehicles (UAVs) rather than a single UAV. In this paper, a proposed formation flight algorithm is tested and a Graphical User Interface (GUI) is implemented on the ground station to allow for path planning and flight control. The proposed algorithm is based on a Hierarchal Leader-Follower formation, where the leader has more flexibility and independence, while the follower is completely dependent on the path taken by the leader. The path planning and the proposed formation flight algorithm are implemented on one axis and tested on two quadrotors. The proposed algorithm is implemented on real quadrotors and its ability to track the given path will be shown.
2018 5th International Conference on Renewable Energy: Generation and Applications (ICREGA), 2018
Design of a mini prototype wave energy converter (WEC) system is considered in this paper. The pr... more Design of a mini prototype wave energy converter (WEC) system is considered in this paper. The prototype is based on permanent magnet linear generator (PMLG) with planar structure. The main objective of this work is to create a simple and low cost prototype of WEC system for study and teaching purposes. In the design procedure, optimization of the detailed parameters to obtain the output power with the barrier of physical dimensions is considered. The PMLG is combined with a linear actuator based on DC motor, sensors and data acquisition devices to represent a WEC system. The experimental test is performed to investigate the efficiency of the designed PMLG.
When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected t... more When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected to bypass diodes, a partial shading condition (PSC) occurs, which causes a global maximum power point (GMPP) and numerous local maximum power points (LMPPs) on the power-voltage (P-V) curve. Unlike conventional MPPT techniques that search for multiple LMPPs on the P-V curve, it is possible to track GMPP straightaway by designing a simple but robust MPPT technique that results in faster tracking speed and low power oscillations. Hence, in this study, an improved proportional-integral (PI) coordinated Maximum Power Point Tracking (MPPT) algorithm is designed to enhance the conversion efficiency of a PV system under PSC with fast-tracking speed and reduced power oscillations. Here, PI controllers are used to mitigating the steady-state errors of output voltage and current of PV system that later on passed through an incremental conductance (INC) algorithm to regulate the duty cycle of a dc–d...
Enhancing electrical power conversion of Wave Energy Converters (WECs) is a continuous research a... more Enhancing electrical power conversion of Wave Energy Converters (WECs) is a continuous research area. A variety of electrical circuits topologies have been considered, including passive and active topologies. In this paper, we propose a simple, inexpensive and efficient that combines a conventional six pulse rectifier with resonance phenomena. Electrical resonance was achieved by adding shunt capacitors between the rectifiers diodes. Capacitors value was selected based on dominant electrical frequency which, in turn, governed by the velocity of the translator of the Permanent Magnet Linear Generator (PMLG). The proposed circuit increased the output power and reduced harmonics compared to another resonance topology. Besides, the behaviour of the closed loop WEC system, including hydrodynamic interactions, was also simulated. The new resonance configuration resulted in a wider bandwidth with respect to sea state.
2018 5th International Conference on Renewable Energy: Generation and Applications (ICREGA), 2018
Design of a small scale wave energy converter (WEC) based on linear hydraulic system is considere... more Design of a small scale wave energy converter (WEC) based on linear hydraulic system is considered in this paper. The prototype consists of low speed rotary permanent magnet generator, hydraulic motor, accumulator, valves and pistons. It is incorporated with sensors, data acquisition and monitoring devices, and various mechanical components to create a WEC system and conduct the experiment (dry test). The test is conducted to show the performance and efficiency of the designed system. Additionally, another experiment is performed to check the conversion efficiency of the machine.
This article presents the design methodology of an alternative approach for implementing proporti... more This article presents the design methodology of an alternative approach for implementing proportional-resonant (PR) controller for single-phase grid-tied inverter. The developed PR controller is designed to regulate the grid current with the aim of controlling either the dc-link voltage or the active/reactive power injected into the grid. The control design is based on combining a state feedback controller with a disturbance observer. It turns out that the composite controller can be expressed as a PR controller plus an antiwindup scheme. The latter is required by the resonant portion of the PR controller to attenuate the effect of the control input saturation during transients. On the other hand, when the voltage harmonics are taken into account in the observer design, the composite controller reduces to multiple resonant controllers with an antiwindup scheme. The performance of the existing PR controller was investigated under control saturation to highlight the poor transient performances associated with modulating signal limitation. Experimental tests have been conducted to verify the the performance of the proposed controller. The obtained results demonstrated good transient performances compared with the existing PR controller, particularly during control saturation. Furthermore, performance results under voltage harmonics showed that the proposed controller can achieve accurate control of the current with low total harmonic distortion values.
International Journal of Robotics and Mechatronics, 2015
There are many advantages for having collaborative flight of multiple Unmanned Arial Vehicles (UA... more There are many advantages for having collaborative flight of multiple Unmanned Arial Vehicles (UAVs) rather than a single UAV. In this paper, a proposed formation flight algorithm is tested and a Graphical User Interface (GUI) is implemented on the ground station to allow for path planning and flight control. The proposed algorithm is based on a Hierarchal Leader-Follower formation, where the leader has more flexibility and independence, while the follower is completely dependent on the path taken by the leader. The path planning and the proposed formation flight algorithm are implemented on one axis and tested on two quadrotors. The proposed algorithm is implemented on real quadrotors and its ability to track the given path will be shown.
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