by Yi-Chun Hsu  , Min-Ze Lu  and Chang-Ming Liaw

Received: 18 December 2020;  Published: 28 April 2021;  doi: 10.21926/jept.2102018

This paper proposes a Wind Turbine Emulator (WTE) using an Indirect Field Oriented (IFO) Induction Motor (IM). The IM drive can be controlled as a conventional prime mover in speed mode, or a wind turbine in torque-speed mode via robust observed torque control. This paper presents key issues for establishing a high-performance IFO IM drive. Further, this study develops a wind turbine load Interior Permanent-Magnet Synchronous Generator (IPMSG) followed by a three-phase Vienna Switch-Mode Rectifier (SMR). It receive [...]

by Oleksandr Skrylnyk  , Emilie Courbon  , Nicolas Heymans  and Marc Frère

Received: 18 December 2020;  Published: 14 April 2021;  doi: 10.21926/jept.2102017

Hybrid solar thermal systems are regarded as a promising solution for delivering clean thermal energy for building sector, especially when combining them with different renewable energy sources. Solar energy production usually does not match the thermal energy demand, and the energy storage must be integrated. Thermochemical energy storage is particularly adapted to be used with solar thermal applications. In this article, the design of the combined solar thermochemical energy storage system is demonstrated. The ex [...]

by Chen-Wei Yang  , Min-Ze Lu  , Wei-Ming Ma  and Chang-Ming Liaw

Received: 23 December 2020;  Published: 07 April 2021;  doi: 10.21926/jept.2102016

This paper presents a three-phase full-bridge boost switch-mode rectifier (SMR) fed switched-reluctance motor (SRM) drive with energy storage buffer. First, the power circuits and control schemes of the two power stages are properly designed. Except for having good line drawn power quality, the boostable DC-link voltage of the SRM drive can enhance the SRM driving performance in wide speed range. And the recovered regenerative braking energy can be sent back to the grid successfully. Then, a battery storage system [...]

by Anna Castaldo  , Emilia Gambale  and Giuseppe Vitiello

Received: 19 January 2021;  Published: 02 April 2021;  doi: 10.21926/jept.2102015

Zinc silicates thin films have been obtained by a solid state two steps reaction, consisting in the sputtering deposition of alternating layers of Silicon and Zinc oxide reagents, followed by their annealing carried out at temperatures ranging from 300° to 560 °C, in air or under vacuum. Transparent and chemically stable amorphous orto- and meta- Zinc silicates, respectively Zn2SiO4 and ZnSiO3 , can guest nanoaggregates of reagents (Silicon and/or ZnO ) depending on a careful modulation of the reaction advancement. [...]

by Shih-Ang Hsu

Received: 21 December 2020;  Published: 24 March 2021;  doi: 10.21926/jept.2101014

In order to improve offshore wind power operation and maintenance (O&M), particularly during tropical and non-tropical cyclones, short-term forecasts or nowcasts up to 6 hours of meteorological and oceanographic (met-ocean) parameters including wind, waves, currents and turbulence intensity are needed. On the basis of numerous air-sea and wind-wave interaction experiments, datasets are analyzed including those from simultaneous measurements of wind and waves during Hurricane Wilma. Formulas are presented for nowcas [...]

by Peter Leary  and Peter Malin

Received: 30 November 2020;  Published: 19 March 2021;  doi: 10.21926/jept.2101013

In interest of accurately modelling wellbore production in convective geothermal systems, we draw attention to two approaches to numerical simulation of crustal fluid flow. The historical ‘’strong’’ approach simulates the fluid mass conservation condition on a localised finite difference mesh approximation to poroelastic continua. The more flexible ‘’weak’’ approach globally enforces fluid mass conservation by in effect integrating over all numerical mesh cells. Strong formulation crustal flow simulation emerged fr [...]

by Aurore Raoux  , Ilan Robin  , Jean-Philippe Pezy  , Anne-Claire Bennis  and Jean-Claude Dauvin

Received: 08 October 2020;  Published: 17 March 2021;  doi: 10.21926/jept.2101012

The French coast of the Atlantic and English Channel (EC) is promising for the development of Marine Renewable Energy (MRE), including wind, wave, and tidal stream, due to the high velocity of currents in some parts of the area. This paper, focusing on wind and tidal energy, discusses how the implementation of MRE converters influences biodiversity, and vice versa, through biofouling and reef effects. The understanding of these interactions requires the knowledge of the hydro-sedimentary conditions and the macrofau [...]

by Aly Mousaad Aly  and Milad Rezae

Received: 26 December 2020;  Published: 04 March 2021;  doi: 10.21926/jept.2101011

During their lifecycle, wind turbines can be subjected to multiple hazard loads, such as high-intensity wind, earthquake, wave, and mechanical unbalance. Excessive vibrations, due to these loads, can have detrimental effects on energy production, structural lifecycle, and the initial cost of wind turbines. Vibration control by various means, such as passive, active, and semi-active control systems provide crucial solutions to these issues. We developed a novel control theory that enables semi-active controller tuni [...]

by Hironori Takagi  , Koichi Kakimoto  , Daishuke Mori  , Sou Taminato  , Yashuo Takeda  , osamu yamamoto  and Nobuyuki Imanishi

Received: 12 January 2021;  Published: 24 February 2021;  doi: 10.21926/jept.2101010

The demand for high energy density rechargeable batteries beyond lithium-ion batteries has increased for electric vehicles. In the present study, a novel high energy density rechargeable aqueous lithium battery was proposed. The battery was composed of a lithium metal anode, a lithium-stable non-aqueous electrolyte, a water-stable lithium-ion conducting solid electrolyte of Li1.4Al0.4Ge0.2Ti1.4(PO4)3-epoxy-TiO2 separator, and a hydroquinone sulfonic acid (HQS)/benzoquinone sulfonic acid (BQS) redox couple in an aqu [...]

by F.A Hamad  , E. Emenike  , Abbas Mohammed  , S. Gooneratne  and P. Russell

Received: 01 December 2020;  Published: 31 January 2021;  doi: 10.21926/jept.2101009

In this paper, the primary aim is to look at the fundamental melting/solidification processes of polyethylene glycol 1500 (PEG 1500) for energy storage – insulation to prolong the cooling time of pipelines in unexpected shut-down conditions, prevent/minimize the wax deposition, and hydrate formation. Polyethylene glycol 1500 was selected because its melting temperature is >317 K making it a suitable candidate as lagging material to prevent wax deposition and hydrate formation in subsea oil pipelines. Experimental a [...]