Article
Energy & Fuels
Haitao Li, Wanqi Dong, Nan Zhang, Yifa Chen, Chao Feng
Summary: The ongoing research on AICD structure optimization aims to improve the water control performance of the device. By designing a low viscosity AICD and using orthogonal test, the structure was optimized and the influence of structure parameters on the flow field distribution in AICD was revealed. The water control performance of the optimized AICD was significantly improved compared to the original model under different conditions, as demonstrated by the analysis of water-oil pressure loss difference.
Article
Engineering, Electrical & Electronic
Heesung Roh, Youngwoo Ji, Jae-Yoon Sim
Summary: This brief introduces an energy harvester IC with a maximum power point tracking (MPPT) scheme that can operate in an ultra-wide input power range. By adaptively switching between fixed charge search (FCS) mode and fixed frequency search (FFS) mode, the proposed MPPT algorithm can achieve optimal performance based on the input power level. The implemented chip, using 180nm CMOS process, achieves a wide input power range of 12nW-to-180mW with a peak efficiency of 93.6% and occupies a small area of 1.14 x 1.24mm(2). The MPPT scheme based on hill climbing algorithm demonstrates a conversion efficiency of over 30% even at 12nW input power, while consuming a quiescent current of 2.2nA.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Chemistry, Multidisciplinary
Yun Chan Im, Seung Soo Kwak, Jonghyun Park, Yong Sin Kim
Summary: The proposed intermittent FOCV MPPT method reduces energy loss by refreshing all parameters regularly using an I-V curve tracer. The method consists of two phases: scan and set, and has shown a significant decrease in energy loss compared to conventional FOCV methods under daily temperature and illuminance distributions.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Sikandar Saleem, Muhammad Farhan, Safdar Raza, Fahim Gohar Awan, Arslan Dawood Butt, Nouman Safdar
Summary: This study proposes a single-phase grid-tied solar hybrid system with intelligent power-sharing capability, which extracts maximum power using maximum power point tracking algorithm and improves the power factor through a nonlinear controller. Simulation results demonstrate that the proposed control techniques achieve good performance in improving system efficiency and reducing harmonic distortion.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Dong-Ryeol Oh, Min-Jae Seo, Seung-Tak Ryu
Summary: A 7-bit 3 GS/s two-channel time-interleaved two-step flash analog-to-digital converter (ADC) with 7-GHz effective resolution bandwidth (ERBW) is presented. The ADC shows improved power efficiency and area efficiency as well as input bandwidth. Advanced calibration techniques enhance gain and interpolation linearity. The prototype ADC demonstrates high performance and power efficiency.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2022)
Article
Computer Science, Artificial Intelligence
Tao Hai, Jincheng Zhou, Noritoshi Furukawa
Summary: This article presents the design of a maximum Power Point Tracking (MPPT) controller for photovoltaic (PV) applications. The controller utilizes a Fuzzy Gain Scheduling of Proportional-Integral-Derivative (PID) type controller (FGS-PID) and scaling factors (SF) to enhance control performance and stability in the presence of fluctuations and varying conditions. The use of an adaptive two-level controller and the combination of fuzzy logic system (FLC) and PID control contribute to improved tracking accuracy, reduced settling time, and enhanced dynamic response compared to conventional methods.
Article
Engineering, Electrical & Electronic
Sandip Uprety, Hoi Lee
Summary: This article presents an integrated photovoltaic energy harvester for mobile applications, featuring an irradiance-aware hybrid algorithm and a slew-rate-enhanced fractional open-cell voltage method to improve tracking efficiency and power efficiency. The development achieves high efficiency energy conversion across a wide power range.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2021)
Article
Engineering, Electrical & Electronic
Kyutae Park, Byung-Wook Min
Summary: This article presents a group delay controller circuit based on the delay-sum method, which can be employed in self-interference cancellation circuits in full-duplex radio systems. Variable group delay is achieved by changing power ratios, with resonant reflective loads and asymmetric connections improving response flatness.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
P. Arokiya Prasad, P. Sivakumar
Summary: This paper proposes a new method of extracting maximum power from PV systems under low irradiation and overcast weather conditions using a biased transformer. By using three winding transformers to provide biased voltage and current, the proposed method obtains biased current and voltage from the grid and feeds them to the primary winding-two of the three winding transformers. The method is compared with the conventional incremental conductance method in terms of power, cost, and efficiency analysis.
INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Abeer Omar, Dalia Yousri, Hazem A. Attia, Dalia Allam
Summary: This paper proposes a robust MPPT controller based on the fractional-order incremental conductance method and fractional-order proportional integral controller to achieve high steady-state maximum power point tracking in solar PV systems. The controller integrates fractional-order properties for fast dynamics and high tracking accuracy.
ELECTRIC POWER SYSTEMS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Quanao Wu, Ping Luo, Hao Wang, Qianfeng Wu
Summary: This paper introduces a capacitor sample-hold oscillator architecture that achieves temperature-stabilized operation without a precise reference generator by using a capacitor to sample-hold the peak charge voltage of the previous phase as the reference for the current phase. The frequency of the oscillator depends on the RC time constants of capacitors charging or discharging and the comparator delay time. The architecture improves temperature stability by analyzing the temperature characteristics of the comparator delay time and using temperature compensated bias currents.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Computer Science, Artificial Intelligence
Guo Aihua, Xu Yihan, Kengo Suzuki
Summary: Fluctuations in the output power of photovoltaic systems under climate changes, especially radiation and temperature variations, pose important challenges. This paper proposes a maximum power point tracking method to eliminate power oscillations in PV systems in severe weather conditions. The improved shuffled frog-leaping algorithm and fuzzy controller are used to find optimal parameters. The combination of the fuzzy logic controller and ISFLA algorithm is employed to fine-tune the member functions. A storage system is utilized for increased stability and reliability. Simulation results demonstrate excellent tracking efficiency, with a 16% improvement compared to conventional MPPT controllers under partial shading conditions.
Article
Mathematics
Eneko Artetxe, Jokin Uralde, Oscar Barambones, Isidro Calvo, Imanol Martin
Summary: Photovoltaic energy is a renewable source that plays a crucial role in reducing greenhouse gas emissions and achieving sustainable energy generation. This study proposes a reinforcement learning-based control method to improve the speed and efficiency of photovoltaic power systems. By using a digital twin for simulation training and adjusting the reward function based on maximum power achieved, the RL control shows significant improvements in power output and settling time compared to traditional controllers in both simulations and real implementations.
Article
Engineering, Electrical & Electronic
Minghui Ou, Zhiyong Yang, Zhenjie Yan, Mingkun Ou, Shuanghong Liu, Shan Liang, Shengjiu Liu
Summary: This paper investigates the stability characteristics of zeros for sampled-data models with a triangle sample and hold. The results show that the triangle sample and hold can improve the stability properties of zeros compared to the traditional zero-order hold. An approximated method and the corresponding accurate sampled-data model are proposed in this paper.
Article
Engineering, Electrical & Electronic
Amit Kumar, Pradeep Kumar
Summary: This paper proposes a novel method for improving power quality in PV systems using DSTATCOM, with two-step control processes involving FLC and UVT/ADALINE-LMS controllers. The controllers aim to maintain sinusoidal source current, achieve unit power factor, and perform reactive power compensation in a grid-connected PV system.
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
(2021)
Article
Engineering, Electrical & Electronic
O. Lopez-Lapena, E. Serrano-Finetti, O. Casas
ELECTRONICS LETTERS
(2016)
Article
Engineering, Electrical & Electronic
Oscar Lopez-Lapena, Ernesto Serrano-Finetti, Oscar Casas
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2016)
Article
Agriculture, Multidisciplinary
Oscar Lopez-Lapena, Ramon Pallas-Areny
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2018)
Article
Automation & Control Systems
Oscar Lopez-Lapena
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2018)
Article
Automation & Control Systems
Oscar Lopez-Lapena, Maria Teresa Penella, Manel Gasulla
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2010)
Article
Automation & Control Systems
Oscar Lopez-Lapena, Maria Teresa Penella, Manel Gasulla
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2012)
Article
Engineering, Environmental
Marga Lopez, Xavier Martinez-Farre, Oscar Casas, Marcos Quilez, Jose Polo, Oscar Lopez, Gemma Hornero, Mirta R. Pinilla, Carlos Rovira, Pedro M. Ramos, Beatriz Borges, Hugo Marques, Pedro Silva Girao
Article
Agriculture, Multidisciplinary
Ernesto Serrano-Finetti, Caries Aliau-Bonet, Oscar Lopez-Lapena, Ramon Pallas-Areny
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2019)
Article
Computer Science, Information Systems
Oscar Lopez-Lapena, Jose Polo-Cantero
Summary: This article proposes a time-division multiplexing control algorithm and a circuit design to share the same laser diode and photodiode for power and downstream data transmission, providing a feasible solution to reduce implementation costs for sensor nodes.
IEEE INTERNET OF THINGS JOURNAL
(2022)
Article
Computer Science, Information Systems
Oscar Lopez-Lapena
Summary: A sensor-to-microcontroller interface circuit for inductive sensors that does not require calibration is presented. The circuit utilizes a microcontroller and other components to accurately estimate the inductance of the sensor, with low systematic error.
Article
Automation & Control Systems
M López, LG de Vicuña, M Castilla, P Gayà, O López
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2004)
Article
Engineering, Electrical & Electronic
O López, LG de Vicuña, M Castilla
ELECTRONICS LETTERS
(2001)
Article
Engineering, Electrical & Electronic
M Castilla, LG de Vicuña, M López, O López, J Matas
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2000)
