by Chenchang Li  , Jianqiang Hu  , Jie Yu  , Jieci Xue  , Runze Yang  , Yijie Fu  and Bo Sun

Received: 23 April 2021;  Published: 15 July 2021;  doi: 10.21926/jept.2103033

Due to the uncertainty and volatility of wind speed, its natural output power also exhibits strong volatility. In order to avoid the negative effects of the excessive fluctuation of the output power of wind turbines in the wind farm and the power grid, it is very important to accurately predict and reasonably plan and control the output power of the wind farm. Model predictive control (MPC) is a type of advanced control method that can deal with a multi-input multi-output nonlinear system. Compared to the tradition [...]

by Xiuhui Tang  , Daming Zhang  and Hua Chai

Received: 19 May 2021;  Published: 08 July 2021;  doi: 10.21926/jept.2103032

In AC microgrid systems, technical issues resulting from the power control effect are the power control method efficiency and the filter resonance since voltage-frequency interference and filtering resonance may cause significant control input reduction and oscillation. A simple and robust solution is to regulate active power flow by adding an optimal passive damping resistor. The optimal LCL filter parameterization process in this paper provides an innovative approach to obtain the optimal quality factor and the o [...]

by Shih-Ang Hsu

Received: 13 December 2020;  Published: 06 July 2021;  doi: 10.21926/jept.2103031

In September 2020 Hurricane Sally affected the north central Gulf of Mexico. Making use of the anemometers data available at 4 oil rigs over the affected region, it is found that, when the atmospheric stability was near-neutral, the gust factor (G) decreases linearly with height from approximately 1.28 at 35m above the sea surface to 1.18 at 160 m. In other words, G decreases linearly at the rate around 8% per 100 m from the typical hub height to beyond common hub height. Based on the linear equation found in this [...]

by Aditya Sharma  , Opeyemi Bello  , Catalin Teodoriu  and Hamidreza Karami

Received: 15 February 2021;  Published: 30 June 2021;  doi: 10.21926/jept.2102030

The Industry 4.0 is here, and advanced technologies are widely available for domains such oil and gas which are traditionally slow in adopting extreme new technologies. This paper presents the design architecture and implementation of effective data acquisition (DAQ) and monitoring system applied to an experimental sucker rod pumping unit for both event occurrence and educational purpose using latest technological advancements and industry 4.0 principles. The designed framework allows control and monitoring of anal [...]

by Kenji Morita  and Bun Tsuchiya

Received: 26 March 2021;  Published: 24 June 2021;  doi: 10.21926/jept.2102029

In this review, various studies on the Li depth profiles of metal/electrolyte/metal capacitors and batteries of Au/LCO/LATP/Pt, LCO/LiPON/Si, and LMO/LiPON/NbO with different metal electrodes at both sides (by bias; LCO =LiCoO2, LATP =Li3.1Al0.86Ti1.14Ge1.27P1.73O12, LMO =LiMn2O4, NbO = Nb2O5) using the in-situ reflection ERD (ERD) technique with 9MeV O+4 ion beam and transmission ERD (TERD) technique with 5MeV He+2 ion beam, respectively, are described. For capacitors, the transport fraction of Li-ion in the elect [...]

by Xiang-Yu Sun  , Ping-Hong Jhou  , Min-Ze Lu  and Chang-Ming Liaw

Received: 25 February 2021;  Published: 22 June 2021;  doi: 10.21926/jept.2102028

This paper presents the development of a wind Interior Permanent-Magnet Synchronous Generator (IPMSG) based bipolar DC microgrids along with various switch-mode rectifiers. Firstly, the wind IPMSG is established and adequately controlled to possess satisfactory generating characteristics during different driven speeds and loads. Later, the boost switch-mode rectifier (SMR) based bipolar DC bus is established. Further, three-phase single-switch (3P1SW) boost SMR, three-phase two-switch (3P2SW) three-level boost SMR, [...]

by Nicholas J Cook

Received: 14 April 2021;  Published: 25 June 2021;  doi: 10.21926/jept.2102027

A refined and extended version of the Offset Elliptical Normal mixture model has been developed to parameterise the seasonal diurnal wind vector automatically. Automated using R scripts, the method eliminates any potential risk of confirmation bias posed by the manual supervision in the original method. Refinements to the method include the latest algorithms for clustering of Gaussian mixtures, with Bayesian regularisation to set the number of components and to limit the predisposition to overfit. A new extension u [...]

by Peng Li  , Chi-Yao Chang  and Amsini Sadiki

Received: 02 April 2021;  Published: 28 June 2021;  doi: 10.21926/jept.2102026

A numerical model describing the ballistic behavior of a commercially used initiator is presented in this article. This model was built on the principle of conservation of mass and energy in the multi-phase framework incorporated with multi-loaded conditions. After obtaining the information about the grain size distribution in each composite, a fixing factor was proposed based on the surface area ratio of the composites. Thus, the solid propellant burning process based on distributed grain size was described, and t [...]

by Shih-Ang Hsu

Received: 16 April 2021;  Published: 16 June 2021;  doi: 10.21926/jept.2102025

During a tropical cyclone (TC) worldwide, the Regional and Mesoscale Meteorological Branch (RAMMB) of NOAA/NESDIS (http://rammb.cira.colostate.edu/) issues real-time TC surface wind analyses. The purpose of this article is to provide value-added estimations of several meteorological and oceanographic (met-ocean) parameters including overwater friction velocity and turbulence intensity, variation of the wind speed with height, significant wave height, peak or dominant wave period, wind-driven currents and wind-stres [...]

by Andrew C. Chien  , Eric Y. Lin  and Nicole J. Ye

Received: 26 April 2021;  Published: 11 June 2021;  doi: 10.21926/jept.2102024

The metallic copper, alkaline earth metal oxide, boron, and perovskite were incorporated on the surface of a Ni-cermet anode, and the performance of the modified Solid Oxide Fuel Cell (SOFC) anode was evaluated. The cell performance was analyzed by voltage-current characteristics (V-I curve) and H2-CH4 step reactions (P-t curve) in a potentiostatic mode. Besides, we also determined if a metallic phase or high electronic conductivity of the anode is important for a cell to perform well when H2 is used as a fuel, whe [...]