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Coordination control for output voltage of optical-storage independent microgrid based on adaptive optimisation

International Journal of Powertrains 2023年第4期12卷 299-310页

作者： Zhou, Haocheng Lu, Fengting Liu, Youchun Product Research & Development Center Jiangsu Electric Power Information Technology Co. Ltd. Nanjing210024 China

The optical-storage independent microgrid system has complex structure, and the change of load parameters will lead to insufficient stability of output voltage. Therefore, a coordination control method for output voltage of optical-storage independent microgrid based on adaptive optimisation is proposed. The topological graph of optical-storage independent microgrid is constructed to obtain the load state parameters of optical-storage independent microgrid for constructing the optimisation model of load state parameters. Through adaptive adjustment of step and square wave response, the load state optimisation parameters are obtained by fusion processing, and then the output voltage of the optical-storage independent microgrid is constrained. The output voltage stability of optical-storage independent microgrid is adjusted, and the coordination control of output voltage stability of optical-storage independent microgrid is realised. The simulation results show that the optical-storage independent microgrid controlled by this method has good output voltage stability and strong adaptive parameter optimisation ability. Copyright © 2023 Inderscience Enterprises Ltd.

关键词： Stability

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Accommodation Capacity Evaluation of Distributed PV Considering Security Constraints of Feeders and Substation Areas

Accommodation Capacity Evaluation of Distributed PV Consider...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Xu, Yan Hu, Peng Dong, Jiansheng Li, Jun Wang, Ning Jiangsu Frontier Electric Technology Product Technology Research and Development Center Nanjing China

ISBN: (纸本)9798350300222

The integration of distributed photovoltaic (PV) has become a crucial way to integrate new energy into power grids with the proposal of the new power system construction strategy. However, ensuring the stable operation of the power grid and the reliable consumption of new energy poses a significant challenge. To address this challenge, this paper proposes an accommodation capacity evaluation method for distributed PV, considering the security constraints of feeders and substation areas. The technical requirements and accommodation mechanism of distributed PV are elaborated, and an evaluation model is established, including objective functions and safety constraints such as main station rated capacity and load distribution. Furthermore, a feeder-area bi-level model solution method is proposed, and the maximum accommodation capacity of distributed PV is solved using the particle swarm optimization (PSO) algorithm, with the node and line number rules given. Finally, the feasibility and effectiveness of the proposed method are verified in a practical power grid example, demonstrating that the proposed method can comprehensively obtain the accommodation capacity of PV, considering various security constraints of the feeders and substation areas. This method provides a guarantee for the safety and stability of new power systems with the large-scale integration of new energy. © 2023 IEEE.

关键词： Particle swarm optimization (PSO)

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Power quality comprehensive evaluation method of regional distribution network based on random forest 4

Power quality comprehensive evaluation method of regional di...

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4th International Conference on New Energy and Power Engineering, ICNEPE 2024

作者： Chen, Zhenxing Zhang, Haitao Sun, Hongxiao Gao, Baoguo Tianjin Richsoft Electric Power Information Technology Co. Ltd. Research and Development Center Tianjin China Tianjin Richsoft Electric Power Information Technology Co. Ltd. Research and Product Center Tianjin China

ISBN: (纸本)9798331516086

In this paper, a comprehensive evaluation method considering both steady state and transient state indexes is proposed for power quality evaluation in regional distribution network operation. The steady-state evaluation index includes voltage deviation, frequency deviation, three-phase unbalance and harmonic distortion rate, while the transient evaluation index only includes voltage drop. The weight of the comprehensive evaluation model is composed of subjective weight and objective weight in a product weighted way, wherein the subjective weight is determined based on analytic hierarchy process, the evaluation function is established for the steady-state index in the objective weight to satisfy the Cauchy distribution, and the evaluation membership function is established for the transient index according to the voltage sag evaluation system proposed by IEEE1564-2014. The operation principle of the random forest algorithm is analyzed, and the solution flow of the comprehensive evaluation model is designed based on the random forest algorithm. Through the analysis of the operation results of the simulation algorithm, the comprehensive evaluation model provides a targeted governance guide for power quality, reduces the difficulty of power quality factor identification, and improves the efficiency of power quality governance. © 2024 IEEE.

关键词： Power distribution networks

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A deep learning approach for error detection and quantification in extrusion-based bioprinting

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Materials Today: Proceedings 2022年 70卷 131-135页

作者： Bonatti, Amedeo Franco Vozzi, Giovanni Kai Chua, Chee De Maria, Carmelo Department of Information Engineering and Research Center "Enrico Piaggio" University of Pisa Pisa Italy Engineering Product Development Pillar Singapore University of Technology and Design Singapore

Quality control in extrusion-based bioprinting (EBB) represents a crucial step to: i) reduce the trial-and-error process and associated material consumption, ii) achieve standard results across different set-ups and laboratories to comply with relevant health standards, and iii) so accelerate the translation of Tissue Engineered products to more impactful clinical applications. In this context, machine learning algorithms represent a key enabling technology that is currently being explored in literature for quality control in EBB, thanks to their ability to learn relevant features from a training dataset and generalize to new, unseen data. In this work, we present a novel application of a deep learning model to EBB, namely a convolutional Long Short-Term Memory (LSTM) autoencoder, to extract a relevant quality measure from videos taken from a frontal view during the printing process. In particular, a comprehensive dataset was built by varying multiple printing parameters and using different EBB set-ups. The data was then used to train the model and validate it using videos containing different types of errors (i.e., under- or over-extrusion). Results highlight that the approach can effectively detect relevant extrusion-related problems in a proportional way to the error magnitude, and so can be applied as a quality control solution for the EBB process. © 2022

关键词： Long short-term memory

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Insight into the quality deterioration induced by microorganisms in Litopenaeus vannamei during superchilling storage

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Food Science and Human Wellness 2024年第6期13卷 3461-3471页

作者： Chuang Pan Kaiying Yang Xianqing Yang Haiyun Wu Chunsheng Li Shuxian Hao Yongqiang Zhao Shengjun Chen Xiaoshan Long Key Laboratory of Aquatic Product Processing Ministry of Agriculture and Rural AffairsNational Research and Development Center for Aquatic Product ProcessingSouth China Sea Fisheries Research InstituteChinese Academy of Fishery ScienceGuangzhou 510300China Co-Innovation Center of Jiangsu Marine Bio-industry Technology Jiangsu Ocean UniversityLianyungang 222005China College of Food Science and Technology Guangdong Ocean UniversityZhanjiang 524088China Collaborative Innovation Center of Seafood Deep Processing Dalian Polytechinc UniversityDalian 116034China Key Laboratory of Effi cient Utilization and Processing of Marine Fishery Resources of Hainan Province Sanya Tropical Fisheries Research InstituteSanya 572000China Graduate School of Marine Science and Technology Tokyo University of Marine Science and TechnologyTokyo 1088477Japan

Quality deterioration induced by microbial community in Litopenaeus vannamei during superchilling storage were demonstrated in this *** this study,6 microorganisms were identified as the biomarkers by 16S rDNA sequencing and 71 differential metabolites were identified by untargeted *** correlation analysis between microorganisms and differential metabolites revealed that Oceanicaulis,Aliihoeflea,Prauserella,Chelativorans and Pseudoalteromonas had the potential to be the important microorganisms of deterioration of superchilled ***,the spearman correlation analysis revealed that lightness value had highly significant correlation with Shewanella(P<0.01),and thiobarbituric acid content,total viable count value,total sulfhydryl content,trichloroacetic acid-soluble peptide and Ca2+-ATPase activity showed significantly correlation with Oceanicaulis,Prauserella,Chelativorans,Aliihoefl ea and Pseudoalteromonas(P<0.05).This study offers a better understanding for mechanisms behind quality degradation induced by microorganisms,which may help the quality maintaining of Pacific white shrimp during superchilling storage.

关键词： Superchilling Psychrophiles Untargeted metabolomics Litopenaeus vannamei Quality

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Naked-Eye 3D Display System Based on Microlens Array

Naked-Eye 3D Display System Based on Microlens Array

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The 2023 International Conference on Display technology, (ICDT 2023)

作者： Wu, Congrui Ma, Xitong Tang, Xiaojun Li, Xin Duan, Ran Zhao, Xingxing Zhou, Xing BOE Technology Group Co Ltd Research Institute of IoT and AI Beijing China BOE Technology Group Co Testing and Certification Center Beijing China BOE Technology Group Co Ltd LCD Product Development Center Beijing China

3D display technology can bring users 3D stereoscopic and realistic visual experience. At present, many types of 3D display technologies have been developed in this field. Among them, naked eye 3D is a more advanced 3D display technology. Compared with traditional polarized 3D display technology, it allows people to directly observe the stereo vision effect without polarized glasses. The naked-eye 3D technology discussed in this paper is based on micro-lens array, which is an important branch in the field of naked-eye 3D display. In this paper, the real-time human eye tracking technology is used to capture the user's human eye coordinates, and the pixel layout on the display module is adjusted in real time according to the human eye coordinate position, so as to ensure that the images taken into the human eye within any visual angle range have a threedimensional effect. BOE has accumulated many advanced technologies in the field of display and artificial intelligence, especially in the fields of high-resolution display, new display and human eye tracking. This paper focuses on the naked eye 3D display system independently developed by BOE. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Eye tracking

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A low complexity JPEG coding system 4

A low complexity JPEG coding system

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4th International Conference on Neural Networks, Information and Communication Engineering, NNICE 2024

作者： Zhang, Xing Zhang, Xiaoqiang Zheng, Xinxing Xu, Mingyu Anhui Polytechnic University School of Integrated Circuit Wuhu China Anhui Automotive Display Integrated System Engineering Research Center Wuhu China School of Information and Artificial Intelligence Wuhu Institute of Technology Wuhu China Wuhu Automot. Intelligent Product Development and Application Engineering Technology Research Center Wuhu China

ISBN: (纸本)9798350394375

In the field of image compression, the traditional JPEG encoding uses a lot of multiplication operations in the discrete cosine transform and quantization. In order to reduce the computational complexity and meet the real-time requirements of the system, a low-complexity 8∗8 orthogonal transformation matrix is proposed for low-bit-rate image compression, which only contains 0 and 1, without multiplication and shift operations. In addition, an approximate quantization table is designed to replace the traditional quantization table, in which addition and multiplication are not required, only shift operations are required. The results show that the image quality obtained by approximate quantization is basically the same as that of standard quantization, and the proposed coding framework can also be implemented on FPGA. © 2024 IEEE.

关键词： Discrete cosine transforms

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Spatial Display System Based on Cylindrical Lens technology

Spatial Display System Based on Cylindrical Lens Technology

引用

SID International Symposium Digest of Technical Papers, 2023

作者： Ma, Xitong Wu, Congrui Tang, Xiaojun Xin, L. Duan, Ran Zhao, Xingxing Zhou, Xing Zhang, Ziyue BOE Technology Group Co Ltd Research Institute of IoT and AI Beijing China BOE Technology Group Co Testing and Certification Center Beijing China BOE Technology Group Co. Ltd LCD Product Development Center Beijing China

Compared with traditional two-dimensional displays, three dimensional displays can bring users a more realistic visual experience. In recent years, with the development of naked eye 3D technology, users can completely get rid of the shackles of glasses and experience stereoscopic visual effects more freely. The 3D display technology based on the cylindrical lens is a vital technology branch in the field of stereoscopic display. The lens light splitting and eye tracking technology are used to ensure that the image taken into the human eye at any viewing angle has correct parallax, thus giving people a three-dimensional feeling. BOE has accumulated numerous technologies in the display field, especially in the fields of high-resolution display and new display. This paper focuses on the space reality display system independently developed by BOE. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Eye tracking

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Measurement-based Modeling of High Frequency Equivalent Circuit of Permanent Magnet Synchronous Motor of Electric Vehicle 13

Measurement-based Modeling of High Frequency Equivalent Circ...

引用

13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Yang, Shuangjie Zhai, Li Hu, Guixing Beijing Institute of Technology National Engineering Research Center of Electric Vehicles Beijing China Hangzhou Hikvision Digital Technology Co. Ltd Product Research & Development Center Hangzhou China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

The high-frequency circuit model of drive motor will affect the accuracy of electromagnetic interference (EMI) prediction of electric drive system. Therefore, a measurement-based high-frequency equivalent circuit modeling method for the permanent magnet synchronous motor (PMSM) of electric vehicles (EVs) is proposed. The common mode (CM) and differential mode (DM) impedance of star-connected PMSM is measured using a vector network analyzer (VNA). According to resonance points on the impedance curve, the circuit topology of motor winding is determined and parameters are calculated, the high-frequency CM and DM equivalent circuit models of PMSM are established respectively. There is a clear correlation between the components and geometry of the motor. The simulation and measurement comparison results verify the accuracy of the model. The influence of the motor impedance on the conducted EMI is analyzed through the system conducted emission test. Using this model, main components of PMSM that cause conducted emission to exceed the standard can be found, which provides a theoretical basis for suppressing conducted EMI exceeding the standard point. © 2022 IEEE.

关键词： Equivalent circuits

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Grain Yield,Biomass Accumulation,and Leaf Photosynthetic Characteristics of Rice under Combined Salinity-Drought Stress

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Rice science 2024年第1期31卷 118-128,I0023页

作者： WEI Huanhe GENG Xiaoyu ZHANG Xiang ZHU Wang ZHANG Xubin CHEN Yinglong HUO Zhongyang ZHOU Guisheng MENG Tianyao DAI Qigen Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops/Key Laboratory of Saline-Alkali Soil Reclamation and Utilization in Coastal Areas the Ministry of Agriculture and Rural Affairs of China/Research Institute of Rice Industrial Engineering TechnologyYangzhou UniversityYangzhou 225009China Institute of Agricultural Science and Technology Development/Joint International Research Laboratory of Agriculture and Agri-Product Safety the Ministry of Education of ChinaYangzhou UniversityYangzhou 225009China

Simultaneous stresses of salinity and drought often coincide during rice-growing seasons in saline lands,primarily due to insufficient water resources and inadequate irrigation ***,combined salinity-drought stress poses a major threat to rice *** this study,two salinity levels(NS,non-salinity;HS,high salinity)along with three drought treatments(CC,control condition;DJ,drought stress imposed at jointing;DH,drought stress imposed at heading)were performed to investigate their combined influences on leaf photosynthetic characteristics,biomass accumulation,and rice yield ***,drought,and their combination led to a shortened growth period from heading to maturity,resulting in a reduced overall growth *** yield was reduced under both salinity and drought stress,with a more substantial reduction under the combined salinity-drought *** combined stress imposed at heading caused greater yield losses in rice compared with the stress imposed at ***,the combined salinity-drought stress induced greater decreases in shoot biomass accumulation from heading to maturity,as well as in shoot biomass and nonstructural carbohydrate(NSC)content in the stem at heading and ***,it increased the harvest index and NSC remobilization *** and drought reduced the leaf area index and SPAD value of flag leaves and weakened the leaf photosynthetic characteristics as indicated by lower photosynthetic rates,transpiration rates,and stomatal *** reductions were more pronounced under the combined ***,drought,and especially their combination,decreased the activities of ascorbate peroxidase,catalase,and superoxide dismutase,while increasing the contents of malondialdehyde,hydrogen peroxide,and superoxide *** results indicated a more significant yield loss in rice when subjected to combined salinity-drought *** individual and combined stresses of salinity and dro

关键词： antioxidant defense system combined salinity-drought stress drought stress photosynthetic characteristics rice salinity stress

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