Energy Harvesting and Systems最新文献_第6页

Modelling of a piezoelectric beam with a full-bridge rectifier under arbitrary excitation: experimental validation 任意激励下带全桥整流的压电梁的建模:实验验证

Energy Harvesting and Systems Pub Date : 2023-01-04 DOI: 10.2139/ssrn.4176712

M. Febbo, S. P. Machado, A. Oliva, Matias Ortiz, Nicolas Pereyra

{"title":"Modelling of a piezoelectric beam with a full-bridge rectifier under arbitrary excitation: experimental validation","authors":"M. Febbo, S. P. Machado, A. Oliva, Matias Ortiz, Nicolas Pereyra","doi":"10.2139/ssrn.4176712","DOIUrl":"https://doi.org/10.2139/ssrn.4176712","url":null,"abstract":"Abstract This paper presents a set of nonlinear differential equations to model a piezoelectric energy harvesting (PEH) system with a full-bridge waveform rectifier (FWR) under arbitrary base excitations. The PEH comprises a piezoelectric element modeled as a current source with a capacitor in parallel, which are connected with an inductor and a resistor. The inductor is proposed to smooth the current generated by the piezoelectric element under rapid mechanical variations and improve the convergence of the set of differential equations. The equations are obtained using piecewise linear modelling for the diodes. The main advantage of this piecewise linear modelling is considering different bias points to represent the nonlinear characteristics of real diodes. Numerical simulations are employed to obtain the optimum inductor value through a comparison with an analytical result, validated with experimental tests. A real case of random acceleration in a bike is applied to the PEH-FWR to evaluate the performance of the proposed equations. They are validated with experiments, a LTspice formulation and a numerical previous one. The proposed formulation can estimate the output DC voltage and energy for a large range of excitation frequencies, including resonant and nonresonant conditions and arbitrary or harmonically externally excited PEHs with FWR.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72600445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modelling of a piezoelectric beam with a full-bridge rectifier under arbitrary excitation: experimental validation 任意激励下带全桥整流的压电梁的建模:实验验证

Energy Harvesting and Systems Pub Date : 2023-01-04 DOI: 10.1515/ehs-2022-0099

Mariano Febbo, Sebastian P. Machado, Alejandro Oliva, Matias Ortiz, Nicolas Pereyra

{"title":"Modelling of a piezoelectric beam with a full-bridge rectifier under arbitrary excitation: experimental validation","authors":"Mariano Febbo, Sebastian P. Machado, Alejandro Oliva, Matias Ortiz, Nicolas Pereyra","doi":"10.1515/ehs-2022-0099","DOIUrl":"https://doi.org/10.1515/ehs-2022-0099","url":null,"abstract":"Abstract This paper presents a set of nonlinear differential equations to model a piezoelectric energy harvesting (PEH) system with a full-bridge waveform rectifier (FWR) under arbitrary base excitations. The PEH comprises a piezoelectric element modeled as a current source with a capacitor in parallel, which are connected with an inductor and a resistor. The inductor is proposed to smooth the current generated by the piezoelectric element under rapid mechanical variations and improve the convergence of the set of differential equations. The equations are obtained using piecewise linear modelling for the diodes. The main advantage of this piecewise linear modelling is considering different bias points to represent the nonlinear characteristics of real diodes. Numerical simulations are employed to obtain the optimum inductor value through a comparison with an analytical result, validated with experimental tests. A real case of random acceleration in a bike is applied to the PEH-FWR to evaluate the performance of the proposed equations. They are validated with experiments, a LTspice formulation and a numerical previous one. The proposed formulation can estimate the output DC voltage and energy for a large range of excitation frequencies, including resonant and nonresonant conditions and arbitrary or harmonically externally excited PEHs with FWR.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135499681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi capacitor modeling for triboelectric nanogenerators with multiple effective parameters 多有效参数摩擦纳米发电机的多电容建模

Energy Harvesting and Systems Pub Date : 2022-12-23 DOI: 10.1515/ehs-2022-0059

Mohsen Keykha, Mohsen Hosseni

引用次数: 0

“Design and development of magnetic field harvester to power wireless sensors in smart Grid” 智能电网无线传感器磁场采集器的设计与开发

Energy Harvesting and Systems Pub Date : 2022-12-12 DOI: 10.1515/ehs-2022-0046

Pavana H, Rohini Deshpande

引用次数: 0

Design of control system for solar power generation based on an improved bat algorithm for an island operation 基于改进蝙蝠算法的孤岛运行太阳能发电控制系统设计

Energy Harvesting and Systems Pub Date : 2022-12-08 DOI: 10.1515/ehs-2022-0045

Amoh Mensah Akwasi, Xie Wei

{"title":"Design of control system for solar power generation based on an improved bat algorithm for an island operation","authors":"Amoh Mensah Akwasi, Xie Wei","doi":"10.1515/ehs-2022-0045","DOIUrl":"https://doi.org/10.1515/ehs-2022-0045","url":null,"abstract":"Abstract Solar energy is sustained using the principle of photovoltaic effect through a solar photovoltaic (PV) system as the main receiver of sunlight for the island. The use of photovoltaic (PV) systems to generate power from solar energy has increased in recent years due to its availability and sustainability. The proposed bat algorithm provides a very quick confluence and high accuracy since it interactively merges with the exploration advancements with the substantial distinctive signal search during the maximum power point tracking process from the PV array. The improved bat algorithm proposes a signal search method to increase the speed and tracks more power at a longer distance by using the signal between the bat and its prey. An energy storage system (ESS) stores solar energy and releases it into the system for use when energy generation from the source is low. DC to DC converter controls and regulates the output generated voltage from the PV array. DC to AC converter converts DC power produced to AC power to be supplied to the island for use. The design and simulation were performed in MATLAB Simulink and the result shows the effectiveness of the proposed design.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"2007 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83341671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Energy harvesting for mobile agents supporting wireless sensor networks 支持无线传感器网络的移动代理的能量收集

Energy Harvesting and Systems Pub Date : 2022-12-05 DOI: 10.1515/ehs-2022-0086

Minh Le Nguyen, Cuong V. Nguyen, Hoa T. Tran, F. Viola

引用次数: 2

Innovative high-speed method for detecting hotspots in high-density solar panels by machine vision 基于机器视觉的高密度太阳能板热点检测的创新高速方法

Energy Harvesting and Systems Pub Date : 2022-12-05 DOI: 10.1515/ehs-2022-0100

H. Yazdani, M. Radmehr, Alireza Ghorbani

{"title":"Innovative high-speed method for detecting hotspots in high-density solar panels by machine vision","authors":"H. Yazdani, M. Radmehr, Alireza Ghorbani","doi":"10.1515/ehs-2022-0100","DOIUrl":"https://doi.org/10.1515/ehs-2022-0100","url":null,"abstract":"Abstract The occurrence of hotspots in photovoltaic panels is one of the most common problems of solar power plants, which reduces the output power of photovoltaic arrays and can also cause irreparable damage to the solar cells. There are several ways to identify hotspots, including using custom datasets using thermographic camera images, which will be later used to teach YOLO and Faster R-CNN computer vision algorithms. In practice, it is observed that the YOLO algorithm is many times faster than the Faster R-CNN in high-density solar panels. Therefore, the applied method is the safest choice for automatic hotspot detection in large-scale photovoltaic power plants to improve overall efficiency. In this paper, by comparing the performance of methods such as Faster R-CNN with YOLO, we concluded that the YOLO algorithm has far better advantages in terms of quality of detection, and speed. Therefore, this factor makes the use of YOLO significantly helps to speed up the troubleshooting of solar modules caused by hotspots, and this factor improves the efficiency of solar power plants in the long run. Meanwhile, in the studies for this paper, the results extracted by Python have been optimized as an algorithm to be used for hotspot detection.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80244285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design, simulation and performance analysis of photovoltaic solar water pumping system 光伏太阳能水泵系统设计、仿真及性能分析

Energy Harvesting and Systems Pub Date : 2022-12-01 DOI: 10.1515/ehs-2022-0040

Ali O. M. Maka, Mubbashar Mehmood, T. Chaudhary

{"title":"Design, simulation and performance analysis of photovoltaic solar water pumping system","authors":"Ali O. M. Maka, Mubbashar Mehmood, T. Chaudhary","doi":"10.1515/ehs-2022-0040","DOIUrl":"https://doi.org/10.1515/ehs-2022-0040","url":null,"abstract":"Abstract The solar photovoltaic system is one of the technologies which is used to pump water in rural, isolated and desert areas where electric connection to the main grid is a problem. The study area is selected because of its higher natural resources of solar radiation over the year. Thus, that encourages us to adopt this study in order to understand the effects of various operating parameters on performance behaviour, which leads to enhancing the system design. This paper aims to assess the solar water pump system’s design and estimated performance in real environmental conditions. The PVsyst has been used to design and simulate a system which allows us to analyse the operating behaviour of a photovoltaic solar water pumping system. The solar PV pumping system design is considered; the photovoltaic module has characteristics and the pumping system characteristics. The photovoltaic array losses due to temperature were estimated about −14.3% and the soiling losses represented approximately −5%. The results showed that performance losses were significant variance in the months of the summer season from May to July. Therefore, their implication on the water flow rates significantly decreases throughout the months of the summer season from May to July, respectively.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85725972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Hybrid optimization for optimal positioning and sizing of distributed generators in unbalanced distribution networks 不平衡配电网中分布式发电机最优定位和最优规模的混合优化

Energy Harvesting and Systems Pub Date : 2022-11-29 DOI: 10.1515/ehs-2021-0046

S. Mhetre, I. Korachagaon

引用次数: 0

Preparation of Na2HPO4⋅12H2O-based composite PCM and its application in air insulated box Na2HPO4·12h2o基复合材料PCM的制备及其在空气绝缘箱中的应用

Energy Harvesting and Systems Pub Date : 2022-11-21 DOI: 10.1515/ehs-2021-0025

M. Zheng, Yue-ping Li, Xiaojian Peng, Shuai Zhang

{"title":"Preparation of Na2HPO4⋅12H2O-based composite PCM and its application in air insulated box","authors":"M. Zheng, Yue-ping Li, Xiaojian Peng, Shuai Zhang","doi":"10.1515/ehs-2021-0025","DOIUrl":"https://doi.org/10.1515/ehs-2021-0025","url":null,"abstract":"Abstract In order to provide continuous supply for succeeding application, abundant electricity energy and solar energy can be stored by means of thermal storage technology. In the present paper, the heat energy storage/exothermic tests are conducted to evaluate the performance of thermal energy storage and release of electricity energy in the self – designed heat storage box equipped with the composite phase change material (PCM), the delivery of heat to surrounding environment is through an air blower directly. The composite PCM consisting of Na2HPO4⋅12H2O and Na3PO4⋅12H2O at the ratio of 7:3 is used to carry out the tests, which is with stable solidification property. Following results are obtained from this research: (1) The solidification temperature of the composite PCM is 33.4 °C with reduced supercooling degree of 2.6 °C; (2) The is phase change exothermic enthalpy value of the composite PCM is 178.02 J/g; (3) The self – designed “peak load shifting” heat storage equipment for electricity energy is with the energy exchange efficiency of 89.59%. The achievements of this research show the applicability of the thermal storage technology by means of the composite PCM.","PeriodicalId":36885,"journal":{"name":"Energy Harvesting and Systems","volume":"32 1","pages":"85 - 92"},"PeriodicalIF":0.0,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89453672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0