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Monthly Reduced Time-Period Scheduling of Thermal Generators and Energy Storage Considering Daily Minimum Chargeable Energy of Energy Storage

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Energy Engineering 2025年第4期122卷 1469-1489页

作者： Xingxu Zhu Shiye Wang Gangui Yan Junhui Li Hongda Dong Chenggang Li Key Laboratory of Modern Power System Simulation Control and Green Power New Technology of the Ministry of Education Northeast Electric Power UniversityJilin132012China State Grid Jilin Electric Power Co. Ltd.Electric Power Science Research InstituteJilin130021China

To address the excessive complexity of monthly scheduling and the impact of uncertain net load on the chargeable energy of storage,a reduced time-period monthly scheduling model for thermal generators and energy storage,incorporating daily minimum chargeable energy constraints,was ***,considering the variations in the frequency of unit start-ups and shutdowns under different levels of net load fluctuation,a method was proposed to reduce decision time periods for unit start-up and shut-down *** approach,based on the characteristics of net load fluctuations,minimizes the decision variables of units,thereby simplifying the monthly ***,the relationship between energy storage charging and discharging power,net load,and the total maximum/minimum output of units was *** on this,daily minimum chargeable energy constraints were established to ensure the energy storage system meets charging requirements under extreme net load ***,taking into account the operational costs of thermal generators and energy storage,load loss costs,and operational constraints,the reduced time-period monthly schedulingmodel was *** studies demonstrate that the proposedmethod effectively generates economical monthly operation plans for thermal generators and energy storage,significantly reduces model solution time,and satisfies the charging requirements of energy storage under extreme net load conditions.

关键词： Monthly scheduling thermal generators energy storage daily minimum chargeable energy decision time-period reduction unit start-up and shut-down unit commitment renewable energy

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A Regional Coupling Enhanced Omnidirectional Wireless Power Transfer system With Low-Fluctuation Regulation Strategy

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IEEE Transactions on Power Electronics 2025年

作者： Li, Musong Zhang, Xian Chen, Zhixin Dai, Zhongyu Zhao, Liyuan Hebei University of Technology State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin300401 China

Omnidirectional wireless power transfer (OWPT) systems can significantly enhance the charging freedom of the receiver (RC). Nevertheless, variations of RC position bring upon non-negligible output fluctuations, affecting the system stability and efficiency. Existing researches focus on the optimization of magnetic coupling structure (MCS) while being constrained by high control complexity. In this letter, a regional coupling enhanced OWPT system with low-fluctuation regulation strategy is proposed for consumer electronics products (CEP). Firstly, a MCS with self-decoupling multi-transmitter coils (TCs) of the OWPT system is discussed in detail. Secondly, a regulation strategy with high output stability and system efficiency under different working conditions is proposed, which requires only the adjustment of the input phase shift angle on the corresponding TC. Finally, a 100 V/100 kHz experimental prototype is built to validate the regulation strategy of the OWPT system. Experimental results show that the output voltage can be stabilized between 6.31V and 6.67V within a 90° rotational range, with a maximum fluctuation rate of 4.78% and the system efficiency is all over 76%. Meanwhile, in the planar region, the output voltage remains stable between 28.6V and 29.7V, with a maximum fluctuation rate of 3.79% and an average system efficiency of 86.9%. © 1986-2012 IEEE.

关键词： Inductive power transmission

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Differential Protection for Distribution Grids Based on Dual Compressed Sensing Theory

Differential Protection for Distribution Grids Based on Dual...

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2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Duan, Yahui Wu, Tonghua Chen, Wei Dai, Wei Cao, Yuhan Cao, Wenjun School of China EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China The State Key Laboratory of Technology and Equipment for Defense against Power System Operational Risks Nari Technology Co. Ltd. Jiangsu211106 China The State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China State Grid Hebei Electronic Power Research Institute Hebei250002 China State Grid Shandong Electronic Power Research Institute Shandong050011 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

With the increasing integration of distributed renewable energy sources into distribution networks, the characteristics of fault currents in distribution networks have undergone significant changes. Traditional three-stage current protection is no longer sufficient to meet the protection requirements. In theory, a differential protection scheme can better fulfill the requirements of rapid and accurate fault detection and clearance in distribution networks. Differential protection relies on real-time communication for information exchange between devices, and many researchers have incorporated wireless networks such as 5G into distribution network differential protection. Given the exponential growth of data in distribution networks and the security considerations of wireless communication like 5G, this paper proposes a secure protection technique for distribution network differential protection based on dual compressed sensing theory. This technique employs two compressed sensing schemes to compress the data before transmission, reducing the amount of data transferred while enhancing security. Subsequently, secure determinations are made based on the data at both ends processed through the compressed sensing algorithm, ensuring the security of communication in distribution network differential protection while achieving the same level of protection performance as traditional differential protection schemes. © 2025 SPIE.

关键词： Compressed sensing Data transmission Matrices Data communications Wireless communications Network security Reconstruction algorithms Computer security Signal processing Signal to noise ratio

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A MIMO Neural Network Integrated with Maximum Likelihood Phase Recovery for Transoceanic Coherent Transmission

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Journal of Lightwave technology 2025年第12期43卷 5536-5544页

作者： Wang, Kaihui Wang, Chen Zheng, Tianqi Long, Jianyu Sang, Bohan Zhou, Wen Yu, Jianjun Fudan University State Key Laboratory of ASIC and System School of Information Science and Technology Shanghai200433 China

We proposed a low-complexity multi-input multi-output neural network integrated with a maximum likelihood phase recovery algorithm (MIMO-NN-BMLPR), which is adopted in long-haul coherent optical communication. Neural network based equalization can effectively overcome the nonlinear distortions induced during long-haul transmission. However, the forward neural network equalizer is difficult to track the phase of coherent optical signals. We integrate an additional maximum likelihood phase recovery layer with the MIMO-NN structure so that the phase noise can be compensated. In this work, 8-channel 100-GBaud dual-polarization (DP) PS-16QAM signals are successfully transmitted over 6400km and satisfy the normalized generalized mutual information (NGMI) threshold at 0.86. The proposed MIMO-NN-BMLPR integrates the low-complexity phase estimation with the NNE to improve the performance. Compared with the traditional DSP structure, the proposal prolongs the distance by 48.84% with a 39.80% complexity reduction. © 1983-2012 IEEE.

关键词： Optical communication

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Micro-convex structure-assisted laser-induced backside dry etching for high-efficiency fabrication of micro-groove array on fused silica toward manipulation of wetting characteristics

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Journal of Manufacturing Processes 2025年 145卷 236-251页

作者： Huang, Hu An, Hong Qian, Yongfeng Zhang, Zhiyu Jiang, Minqiang Yan, Jiwang Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Electron Microscopy Center Jilin University Changchun130022 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing100190 China School of Engineering Science University of Chinese Academy of Sciences Beijing101408 China Department of Mechanical Engineering Faculty of Science and Technology Keio University Yokohama223-8522 Japan

Fused silica has garnered significant attention in various industrial applications. The creation of surface micro/nanostructures on fused silica can impart specialized functional properties, such as extreme wettability, ultra-high transmittance, and excellent antimicrobial characteristics. Nonetheless, existing technologies for achieving surface micro/nanopatterning of fused silica, including wire electrical discharge machining, chemical etching, and electrochemical deposition, generally suffer from long processing cycles and high energy consumption, which are inconsistent with the development concept of the low-carbon economy. In this study, a novel approach termed micro-convex structure-assisted laser-induced backside dry etching (MCSALIBDE) is proposed for high-efficiency fabrication of micro-groove array on fused silica surfaces. The synergistic effect of enhanced heat conduction and plasma explosion in a confined space facilitates material ablation. The impact of processing parameters including scanning pitch and peak laser power intensity on the morphological and topographical features of the MCSALIBDE-processed fused silica surfaces is studied. Notably, the micro-groove structures with a depth-to-width ratio of 1.19 is fabricated. Furthermore, the wetting behaviors of the MCSALIBDE-processed fused silica surfaces before and after annealing treatment are studied. Experimental findings reveal that the MCSALIBDE-processed fused silica surfaces exhibit enhanced hydrophilicity compared to the untreated one. After annealing treatment, a transformation from hydrophilicity to superhydrophobicity is observed. The superhydrophobic surfaces produced under different laser parameters exhibit distinct adhesion and droplet bouncing behaviors. This work offers an in-depth understanding of the high-efficiency fabrication of micro/nanostructures on fused silica surfaces and as well the modulation of their wetting characteristics, heralding innovations in surface engineering fo

关键词： Wetting

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SkeletonMix: A Mixup-Based Data Augmentation Framework for Skeleton-Based Action Recognition

SkeletonMix: A Mixup-Based Data Augmentation Framework for S...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Zongye Zhang Huanyu Zhou Qingjie Liu Yunhong Wang State Key Laboratory of Virtual Reality Technology and System Beihang University Beijing China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Skeleton-based human action recognition has received widespread attention for its robustness to changes in the background and appearance of actors compared to the RGB modality. Data augmentation is widely used to explicitly regularize the model to prevent overfitting, especially when the number of labeled samples is scarce. However, compared to various augmentation methods available for the RGB modality, there are fewer works on the skeleton modality, especially a model-agnostic augmentation method that can be easily integrated into multiple models. We address the problem by proposing a comprehensive data augmentation framework named SkeletonMix, which contains a pair sample selection module for mixup and random augmentations tailored for skeleton modality. SkeletonMix is a non-learning framework and can be applied to different models in a plug-and-play manner. Extensive experiments on NTU RGB+D, NTU RGB+D 120 and PKU-MMD datasets demonstrate the effectiveness of our proposed framework under limited labeled training data. Our proposed method boosts the performance by a maximum of 7.5% on scarce training data setup (5% of training data).

关键词： Training data Speech recognition Signal processing Data augmentation Skeleton Robustness Data models Human activity recognition Speech processing Overfitting

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Effects of Nonmetallic Particles on Discharges and Breakdown of Liquid Nitrogen

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Xing, Yunqi Zheng, Xu Xiao, Kunran Wang, Mingyang Hebei University of Technology State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin300401 China

Aging of solid insulation and quenching heat of conductor in superconducting power equipment will degrade the insulation paper and generate fiber particle impurities, threatening the equipment's safe and stable operation. In this paper, the non-metallic particles in liquid nitrogen (LN2) are analyzed during force movement in DC, AC, and compound electric fields. The discharge and breakdown characteristics of LN2 containing particles under different electrode structures, voltage forms and particle properties are studied. The experiment results show that fiber particles have the least influence on the pin-plate electrode and breakdown voltage, and the influence of fiber particles on the plate-plate electrode and ball-ball electrode breakdown voltage is similar. The longitudinal electrode is easy to form a bridge under DC voltage, and the fiber particle concentration has a great influence on the initial discharge voltage and breakdown voltage. Particles move reciprocally in small amplitude under AC voltage and cannot form a bridge, but the insulation performance of LN2 is also weakened. Superposition voltage is more likely to cause insulation breakdown than the same value DC voltage, and the breakdown voltage is lower when the same polarity superposition than the different polarity. © 1994-2012 IEEE.

关键词： Electric breakdown of liquids

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Study on Insulation Characteristics of Moisture in the Buffer Layer of 66 kV AC XLPE Cables 19th

Study on Insulation Characteristics of Moisture in the Buffe...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Cao, Kangyangyong Xing, Hongquan Huang, Dawei Wei, Zhenhao Liu, Shili State Grid Changchun Power Supply Company Jilin China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (纸本)9789819613861

To address the frequent failure issues caused by defects in the buffer layer of high-voltage cross-linked polyethylene (XLPE) cables, research on buffer layer has become a hot topic at present. This paper first introduces the input impedance model of the 66 kV cable buffer layer and the corrugated aluminum sheath. The water content can change its resistance and capacitance, thereby affecting the resistivity and dielectric constant. Secondly, the paper introduces the intrinsic principles of frequency domain dielectric spectroscopy technology, where changes in water content alter the relaxation time of the Debye model, thereby changing the dielectric loss factor. Then, by conducting resistance and capacitance measurement experiments on a 6 cm long cable buffer layer, the paper derives the resistivity and dielectric constant variation curves. Through dielectric loss factor measurement experiments, it derives the dielectric loss factor curve, demonstrating the correlation between water content and the dielectric loss factor. The paper concludes that the dielectric loss factor curve is more sensitive to insulation conditions at low frequencies. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Dielectric losses

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Research on Spatio-temporal Non-uniformity Reduction Algorithm and Finite Element Method Verification of Digital Twin Model of Ultra-High Voltage Valve Side Bushing

Research on Spatio-temporal Non-uniformity Reduction Algorit...

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2024 International Conference on Mechatronics and Intelligent Control, ICMIC 2024

作者： Zhang, Shiling Wang, Pengbo He, Yongsheng Dai, Liangjun Deng, Baojia State Grid Chongqing Electric Power Company Electric Power Research Institute Yubei District Chongqing401123 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9781510686847

ISBN: (纸本)9781510686830

Efficient algorithms are an important representation and fundamental prerequisite for the interactive capability of digital twin models. The internal influencing factors and evolution characteristics of the ultra-high pressure valve side casing are complex, resulting in a huge amount of calculation for the twin model. The existing literature lacks a fast calculation method to meet the requirements of fast calculation. The application of classical intrinsic orthogonal decomposition (POD), snapshot POD, and singular value decomposition (SVD) POD to the digital twin reduction of the valve side casing has the problem of low efficiency and cannot meet the fast calculation needs of complex parameters in the digital twin model of the valve side casing. This article proposes the spatiotemporal non-uniform POD reduction algorithm suitable for the digital twin model of ultra-high pressure valve side casing. It decomposes into different regions in space and uses non-uniform sampling in time, which can effectively balance the accuracy and timeliness of the calculation of the digital twin model of ultra-high pressure valve side bushing. When calculating model at 0 seconds and 2.5 seconds, the errors of the spatiotemporal heterogeneity POD reduction calculation results were 0.006% and 0.002%, respectively, indicating that the reduction calculation results can meet the accuracy requirements;The calculation time has been reduced from the 2min12s and 3min45s to 6.78s and 9.61s, both of which have decreased by about 95%, significantly improving the calculation efficiency. © 2025 SPIE.

关键词： Bushings

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system Integration and Software Platform Engineering Implementation of Digital Twin Model for Ultra-high Voltage Converter Valve Side Bushing

System Integration and Software Platform Engineering Impleme...

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2024 International Conference on Mechatronics and Intelligent Control, ICMIC 2024

作者： Zhang, Shiling He, Yongsheng Dai, Liangjun Wang, Pengbo Deng, Baojia State Grid Chongqing Electric Power Company Electric Power Research Institute Yubei District Chongqing401123 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9781510686847

ISBN: (纸本)9781510686830

Compared with simulation technology, the prominent feature of digital twin technology is its complex interaction ability with the external information, which enables the digital twin function of the physical objects through complex interaction. Therefore, a complete digital twin system is formed, and the digital twin model can truly and effectively play its role. To achieve this, it is necessary to establish data interfaces that effectively connect with external information, physical field calculations, the visual displays, etc., to realize the system integration of digital twin models and verify their engineering feasibility. This article analyzes the functional requirements of the system integration, designs its functional framework, constructs functional modules of physical hardware layer, twin model layer, and human-computer interaction layer, and realizes the integration of valve side bushing digital twin model system with data exchange capability, data transmission capability, and coordination between various functional modules. Among generated parameters, E-field strength inside 220kV reduced ratio bushing is controlled within 3kV/mm, and the composite insulator umbrella skirt is installed outside the core. Total length of the bushing is 2465mm, the length of the bushing tail is 810mm, and the length of the hollow composite insulator is 1250mm. © 2025 SPIE.

关键词： Bushings

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