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2nd International Conference on Electronics, Energy and Measurement, IC2EM 2023

作者： Moussa, Faycal Hadj Mihoub Sidi Morsli, Abdelkader Tlemcani, Abdelhalim Belmili, Hocine Nouri, Hassan Medea Algeria Bou-Ismail Tipaza Algeria Electronics and Control Research Group Department of Engineering Design and Mathematics Power Systems Bristol United Kingdom

ISBN: (纸本)9798350314243

This article presents a comparative study of two topologies of three-phase photovoltaic inverters connected to the grid, between the usual two-level inverter and three-level NPC (Neutral Point Clamped) inverter. Inverter control and the boost converter MPPT controller are based on the SRF-dq method and the INC algorithm respectively. The comparison relies on evaluating the overall efficiency and harmonic distortion of the inverter. All circuits are modeled and simulated using Matlab-Simulink. The results obtained indicate satisfaction with the quality, of the current and voltage injected into the electrical grid, and reflect that both inverters are efficient and comply with IEEE-519 standard recommendations, but the three-level inverter performs better results than the two-level inverter. © 2023 IEEE.

关键词： Harmonic distortion

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Design of a Solar Pumping System with Battery Storage Based on Three-Port DC-DC Converter 6

Design of a Solar Pumping System with Battery Storage Based ...

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6th International Youth Conference on Radio Electronics, Electrical and power engineering, REEPE 2024

作者： Zaid, A. Abu Abdelsalam, Ibrahim Marei, M.I. College of Engineering Technology Arab Academy for Science Technology Maritime Transport Electrical Power Systems Department Cairo11742 Egypt College of Engineering Technology Arab Academy for Science Technology Maritime Transport Electrical and Control Department Cairo2033 Egypt Ain Shams University Faculty of Engineering Electrical Power and Machines Department Cairo11769 Egypt

ISBN: (纸本)9798350382891

This paper introduces a design for a photovoltaic (PV) pumping system that incorporates battery bank storage. A three-port DC-DC converter (TPC) is employed to integrate the PV, battery bank, and induction motor drive (IMD) based pumping system. The purpose of the battery bank is to provide support to the pump during shading conditions to prevent frequent suspension and down-thrust situations. Additionally, the proposed system aims to maintain the free-floating impeller operating range by imposing rotational speed limits on the pump. The input ports of the TPC consist of the PV port, which is controlled to harvest the maximum power point (MPP) using the perturb and observe technique, and the battery port. The output port is linked to a DC bus using passive rectifier to supply power to the variable speed V/F IMD. The battery port is regulated to sustain the DC bus voltage in a desired voltage range that ensures the impeller operation under free-floating conditions. The proposed system is simulated using MATLAB/Simulink software. The simulation results are discussed to evaluate the dynamic performance. © 2024 IEEE.

关键词： DC-DC converters

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Achieving an Accurate Random Process Model for PV power Using Cheap Data:Leveraging the SDE and Public Weather Reports

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CSEE Journal of power and Energy systems 2025年第1期11卷 124-135页

作者： Yiwei Qiu Jin Lin Zhipeng Zhou Ningyi Dai Feng Liu Yonghua Song College of Electrical Engineering Sichuan UniversityChengdu610065China State Key Laboratory of the Control and Simulation of Power Systems and Generation Equipment Tsinghua UniversityBeijing 100087China State Key Laboratory of Internet of Things for Smart City University of MacaoMacao999078China Department of Electrical Engineering Tsinghua UniversityBeijing100087China

Stochastic differential equation (SDE)-based random process models of renewable energy sources (RESs) jointly capture evolving probability distribution and temporal correlation in continuous time. It enabled recent studies to remarkably improve performance of power system dynamic uncertainty quantification and optimization. However, considering the non-homogeneous random process nature of PV, there still remains a challenging question: how can a realistic and accurate daily SDE model for PV power be obtained that reflects its weather-dependent and non-Gaussian uncertainty in operation, especially when high-resolution numerical weather prediction (NWP) or sky imager is unavailable for many distributed plants? To fill this gap, this article finds that an accurate SDE model for PV power can be constructed only using the data from low-resolution public weather reports. Specifically, for each day, an hourly parameterized Jacobi diffusion process recreates temporal patterns of PV volatility. Its parameters are mapped from the day's public weather reports to reflect varying weather conditions using a simple learning model. The SDE model jointly captures intraday and intrahour volatility. Statistical examination shows that the proposed approach outperforms a selection of the latest deep learning-based time series models on real-world data collected in Macao.

关键词： Photovoltaic(PV)power random process stochastic differential equation(SDE) stochastic optimization time series modeling uncertainty quantification weather report

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Hybrid Switched-Inductor Switched-Capacitor High Step-Down Converter

Hybrid Switched-Inductor Switched-Capacitor High Step-Down C...

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2024 Energy Conversion Congress and Expo Europe, ECCE Europe 2024

作者： Stala, Robert Bhatnagar, Pallavee Mondzik, Andrzej Waradzyn, Zbigniew Pirog, Stanislaw Folmer, Szymon Gupta, Krishna Kumar Agh University of Krakow Department of Power Electronics and Energy Control Systems Kraków Poland National Institute of Technical Teachers' Training and Research Department of Electrical and Electronics Engineering and Education Bhopal India Thapar Institute of Engineering and Technology Electrical and Instrumentation Engineering Department Patiala India

ISBN: (纸本)9798350364446

This paper presents a hybrid DC-DC converter composed of switch-mode DC-DC converters and switched-capacitor circuits. The system has continuous voltage regulation, low voltage stress across switches, low inductor current, low input and output current ripple values, and high frequency of the output capacitor voltage ripples. Operation of the converter, its efficiency and loss distribution in transistors are demonstrated in the paper. © 2024 IEEE.

关键词： Capacitor bank

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Integrated Distribution Management System:Architecture,Functions,and Application in China

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Journal of Modern power systems and Clean Energy 2022年第2期10卷 245-258页

作者： Wenchuan Wu Penghua Li Bin Wang Yingshang Liu Tao Xu Hongwei Du Yan He the State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China the Electric Power Control Center of China Southern Power Grid Corporation GuangzhouChina the National Electric Power Control Center of State Grid Corporation of China BeijingChina NARI Technology Co. Ltd.NanjingChina Beijing Guoke Hengtong Technology Co. Ltd.BeijingChina

As massive distributed energy resources(DERs)are integrated into distribution networks(DNs)and the distribution automation facilities are widely deployed,the DNs are evolving to active distribution networks(ADNs).This paper introduces the architecture and main function modules of an integrated distribution management system(IDMS)and its applica-tions in *** system consists of three subsystems,including the real-time operation and control system(OCS),outage management system(OMS),and operator training simulator(OTS).The OCS has a hierarchical architecture with three levels,including the local controller for DER clusters,the optimization of DNs incorporated with multi-clusters,and the coordina-tion operation of integrated transmission&distribution(T&D)*** OMS is developed based on the geographical information system(GIS)and coordinated with *** in the OTS,both the ADN and its host transmission network(TN)are simulated to make the simulation results more *** main functions of the three subsystems and their interaction data flows are described and some typical application scenarios are also presented.

关键词： Active distribution network(ADN) integrated distribution management system(IDMS) operation and control system(OCS) outage management system(OMS) operator training simulator(OTS) geographical information system(GIS).

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Comparison of Photovoltaic System Performance under Different Conditions 5

Comparison of Photovoltaic System Performance under Differen...

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5th IEEE International Conference on Modern Electrical and Energy System, MEES 2023

作者： Pavlik, Marek Kalinov, Andrii Technical University of Koice Department of Electric Power Engineering Koice Slovakia Kremenchuk Mykhailo Ostrohradskyi National University Department of Systems of Automatic Control and Electric Drive Kremenchuk Ukraine

ISBN: (纸本)9798350359787

With increasing energy prices, greater attention is being directed towards alternative energy sources. Common households are increasingly adopting photovoltaic systems to reduce their electricity costs. However, many households are unaware that various situations can impact the production of solar energy. In this contribution, a research study was conducted where a small portion of the photovoltaic panel was shaded. The results demonstrate how even minor shading can affect the production of electrical energy from the photovoltaic panel. Additionally, it is important to realize that many photovoltaic systems consist of photovoltaic panels connected in series. This contribution highlights how a single damaged or shaded photovoltaic panel can influence the production of other photovoltaic panels in the series. © 2023 IEEE.

关键词： Photoelectrochemical cells

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Locating Faults on Overhead power Transmission Lines of 110 kV and Above Using Emergency Mode Parameters

Locating Faults on Overhead Power Transmission Lines of 110 ...

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International Youth Conference on Radio Electronics, Electrical and power engineering (REEPE)

作者： Dmitriy Sharygin Galina Filatova Andrey Yablokov Department of electric power systems automatic control Ivanovo State Power Engineering University (ISPU) Ivanovo Russia

ISBN: (数字)9798331531836

ISBN: (纸本)9798331531843

The article is devoted to the development of new fault location algorithms based on emergency mode parameters at instantaneous values on overhead power transmission lines of 110 kV and above. Increasing the accuracy of fault location algorithms is an important and urgent task. The methodological and simulation errors of fault location are directly related to the configuration of the power transmission line. The presence of parallel power transmission lines, mutual induction or branch substations affects the accuracy of fault location. In this work, the authors modernize their own previously developed fault location algorithms based on instantaneous values for complex power transmission line configurations. The developed fault location algorithms do not require additional corrections or means for processing primary signals and can be successfully applied when using data from digital in-strumental transformers. The studies of the algorithms were carried out on the simulation models of the overhead power lines in the Simulink/MATLAB software package. The remote fault location of the damage was carried out according to the parameters of the emergency mode. The assignment of parameters for the simulation modeling is carried out using the Monte Carlo method with subsequent statistical processing of the results and the construction of a justified inspection zone.

关键词： Instrument transformers power transmission lines Accuracy Substations Voltage measurement Software packages Software algorithms Fault location Inspection Transmission line measurements

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Development of the Experimental Set-Up for Testing MV Voltage Transformers Resistance to Ferroresonance

Development of the Experimental Set-Up for Testing MV Voltag...

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International Conference on Industrial engineering, Applications and Manufacturing (ICIEAM)

作者： A. N. Antonov V. D. Lebedev Department of electric power systems automatic control Ivanovo State Power Engineering University (ISPU) Ivanovo Russia

ISBN: (数字)9798331512194

ISBN: (纸本)9798331512200

In $6-10 \text{kV}$ distribution networks the operation of voltage transformers can be affected by many dangerous phenomena, among which ferroresonances are particularly notable. In order to prevent such processes, many manufacturers have developed various versions of anti-resonance voltage transformers. Nevertheless, there is a problem of experimental confirmation of the anti-resonance properties claimed by the manufacturers. This paper presents an in-situ test rig to test 6-10 kV voltage transformers for ferroresonance resistance. Experiments were conducted to detect subharmonic ferroresonance on the physical test bed and the corresponding oscillograms were obtained. The presented experimental set-up allows testing voltage transformers to prevent ferroresonance phenomena in networks with isolated neutral in the most effective way.

关键词： Resistance Thyristors Voltage transformers Distribution networks Production Industrial engineering Ferroresonance Manufacturing Surges Testing

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Condition Evaluation of power Cables Based on BiLSTM with Siamese Attention

Condition Evaluation of Power Cables Based on BiLSTM with Si...

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2023 Panda Forum on power and Energy, PandaFPE 2023

作者： Lin, Menglong Chen, Jianning Zhou, Yuanxiang Pan, Zehua Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China Beijing Electric Power Research Institute State Grid Beijing China

ISBN: (纸本)9798350321173

The fast and accurate state evaluation of cable plays an important role in the safe and reliable operation of power system. Thus a high-voltage cables condition evaluation model based on siamese-attention bidirectional long short-term memory (SA-BiLSTM) is proposed in this paper. First, the attention mechanism was used to optimize the BiLSTM network, which can complete parallel training while obtaining global information. then the optimized network was adopted to build a siamese neural network framework, realizing data classification by calculating the Euclidean distance between feature vectors. Finally, the model was trained and tested through the online monitoring data of high-voltage cables from engineering. The results showed that the accuracy rate, precision, recall rate, F1 score and Matthews correlation coefficient of the SA-BiLSTM model was increased at least by 7.92%, 11.79%, 11.41%, 12.04%, and 20.90%, respectively, compared with other models. © 2023 IEEE.

关键词： Long short-term memory

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Modulated Degradation Rates of Bone Mineral-Like Calcium Phosphate Glass to Support the Proliferation and Osteogenic Differentiation of Bone Marrow-Derived Stem Cells

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Journal of Bionic engineering 2024年第4期21卷 1960-1974页

作者： Lizhe He Yuye Huang Jiafei Gu Xiaoling Liu Jun Yin Xiang Gao Department of Neurosurgery The First Affiliated Hospital of Ningbo UniversityNingbo315010China Center for Medical and Engineering Innovation The First Affiliated Hospital of Ningbo UniversityNingbo315010China The State Key Laboratory of Fluid Power Transmission and Control Systems Key Laboratory of 3D Printing Process and Equipment of Zhejiang ProvinceSchool of Mechanical EngineeringZhejiang UniversityHangzhou310028China Faculty of Science and Engineering University of Nottingham Ningbo ChinaNingbo315100China

With an elemental composition similar to bone mineral,and the ability to release phosphorus and calcium that benefit bone regeneration,Calcium Phosphate Glass(CPG)serves as a promising component of bone tissue engineering ***,the degradation of CPG composites typically results in increased acidity,and its impact on bone-forming activity is less *** this work,we prepared 3D-printed composite scaffolds comprising CPG,Poly-ε-caprolactone(PCL),and various Magnesium Oxide(MgO)*** the MgO content effectively suppressed the degradation of CPG,maintaining a physiological pH of the degradation *** the degradation of CPG/PCL scaffolds resulted in upregulated apoptosis of Rat Bone Marrow-derived Stem Cells(rBMSC),scaffolds containing MgO were free from these negative impacts,and an optimal MgO content of 1 wt%led to the most pronounced osteogenic differentiation of *** work demonstrated that the rapid degradation of CPG impaired the renewability of stem cells through the increased acidity of the surrounding media,and MgO effectively modulated the degradation rate of CPG,thus preventing the negative effects of rapid degradation and supporting the proliferation and osteogenic differentiation of the stem cells.

关键词： Phosphate glass Polymer composites 3D printing Bone tissue engineering Scaffolds

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