Table of Content

Open Access Review

A Review of North American Prospects for Power and Hot-Water Generation with Thermal Energy

Received: 20 November 2023;  Published: 21 February 2024;  doi: 10.21926/jept.2401007

Abstract

This article outlines an innovative approach to explore thermal energy extraction for power generation or industrial hot water applications. Unlike traditional steady-state models, this approach embraces time-variant scenarios, explicitly incorporating a cyclical fluid circulation strategy to maintain a stable surface fluid temperature or power output. By introducing an increasing and decreasing stepwise rate sequence and an intermittent circulation strategy, the method aims to optimize efficiency in response to va [...]

52 340

Open Access Original Research

Nonlinear Optimal Control for a PMLSG-VSC Wave Energy Conversion Unit

Received: 16 September 2023;  Published: 21 February 2024;  doi: 10.21926/jept.2401006

Abstract

This article aims to treat the nonlinear control problem for the complex dynamics of a wave energy unit (WEC) that consists of a Permanent Magnet Linear Synchronous Generator (PMLSG) and a Voltage Source Converter (VSC). The article has developed a globally stable nonlinear optimal control method for this wave power generation unit. The new method avoids complicated state-space model transformations and minimizes the energy dispersion by the control loop. A novel nonlinear optimal control method is proposed for the [...]

71 392

Open Access Review

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Received: 09 December 2023;  Published: 07 February 2024;  doi: 10.21926/jept.2401005

Abstract

The main challenge in designing offshore renewable energy structures is to ensure their structural integrity on a life cycle basis while operating in harsh environments and, in parallel, being financially competitive and environmentally friendly concerning other types of energy systems. The Oscillating Water Column (OWC) converters are among the first energy converters to be developed and deployed into the sea due to their relative simplicity of operation and relatively small number of moving parts. This review pro [...]

78 610

Open Access Research Article

Monitoring Energy-Loss-Driven-Cost by Using Earned Value Simulation in Complex Systems

Received: 24 July 2023;  Published: 06 February 2024;  doi: 10.21926/jept.2401004

Abstract

The economic impact of energy loss stemming from end-user electricity consumption is a significant concern, with historical trends revealing escalating costs. Effectively managing both peak and off-peak demands remains a formidable challenge due to the unpredictable nature of consumer behaviors, leading to energy wastage. This study delves into the nexus of demand uncertainty, financial repercussions, and potential strategies to mitigate energy losses in the evolving landscape of electricity consumption.that causes [...]

66 524

Open Access Original Research

LFO Damping Enhancement in Multimachine Network Using African Vulture Optimization Algorithm

Received: 20 June 2023;  Published: 30 January 2024;  doi: 10.21926/jept.2401003

Abstract

The prolonged presence of low-frequency oscillation (LFO) in power system networks (PSN) poses a significant threat to their stability. Hence, engineers and researchers have continuously developed effective strategies to mitigate the issue and enhance the stability of the PSN. This article proposes a new approach using the African Vultures Optimization Algorithm (AVOA) to design robust Power System Stabilizers (PSS) and enhance the LFO damping in multi-machine networks. The damping ratio-based objective function mi [...]

58 628

Open Access Original Research

Proposal for the Sustainable Electrification of a Primary Healthcare Centre (PHC) Facility in Nigeria

Received: 06 August 2023;  Published: 24 January 2024;  doi: 10.21926/jept.2401002

Abstract

Energy is a prerequisite to running health facilities and is, therefore, key to the success of the service. Karshi primary healthcare centre (PHC) facility is confronted with an unreliable power supply that leads to a high cost of generating power from diesel to operate its equipment. This facility needs a sustainable and reliable electricity supply and therefore a change in their energy system to enable it improve its quality of healthcare delivery services. A solar energy-based electricity generation system that [...]

100 664

Open Access Editorial

Acknowledgment to Reviewers of Journal of Energy and Power Technology in 2023

Received: 04 January 2024;  Published: 05 January 2024;  doi: 10.21926/jept.2401001

Abstract

The editors of Journal of Energy and Power Technology would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2023. We greatly appreciate the contribution of expert reviewers, which is crucial to the journal's editorial process. We aim to recognize reviewer contributions through several mechanisms, of which the annual publication of reviewer names is one. Reviewers can download a certificate of recognition directly from our submission system. Additionally, reviewers can [...]

232 1085

Open Access Original Research

Stability Analysis of Autonomous Microgrid Operated at Constant-Frequency with the Consideration of Reactive Power Balance

Received: 01 September 2023;  Published: 29 November 2023;  doi: 10.21926/jept.2304039

Abstract

Large-scale autonomous microgrids have potential application values as they can increase renewable energy penetration level without compromising the stability of the existing large power systems. Before their widespread implementation, critical issues like stability analysis etc need to be solved. This paper analyses the stability in an autonomous microgrid operated at constant frequency with the consideration of reactive power balance. Difference equations of reactive power for the grid-forming generator are const [...]

151 1333

Open Access Original Research

Array Formation Testing with Multiple Azimuthal and Axial Pressure Transducers

Received: 12 April 2023;  Published: 27 November 2023;  doi: 10.21926/jept.2304038

Abstract

An early formation tester operating a “sink probe” that extracts fluids from the borehole, also measures pressures at its location; pressures are additionally collected at two passive sensors, one situated 180 deg away and the second about meter axially. These positions are not conducive to accurate permeability predictions, since pressure transient signals used for inverse analysis attenuate very rapidly. Closer probe spacings offer formation evaluation advantages at low mobilities because Darcy pressure dissipati [...]

132 1247

Open Access Research Article

Saving is Losing: Pumping Cost vs. GHG Emissions in Water Distribution Systems

Received: 26 May 2023;  Published: 21 November 2023;  doi: 10.21926/jept.2304037

Abstract

Global climate change has necessitated the reduction of GHG emissions. Water distribution system (WDS) pumping adds to these emissions and, therefore, should be reduced. Under electricity hourly cost tariffs, utilities are incentivized to pump during the nighttime hours. This can have a deleterious effect, however, on GHG emissions. To quantify this effect, a modeling study of twelve real WDSs was performed with an electricity tariff. The systems all had the typical tank-level-based pump controls but also time-base [...]

169 1323

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