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Incremental co.t analysis model of distribution network based on eco.omic dispatch of distributed new-energy storage system

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Clean Energy 2024年第2期8卷 89-103页

作者： Zhuan Zhou Jiayu Bian Zhiyong Yu State Grid Xinjiang electric Power co. ltdXinjiangChina

With the implementation of China’s carbon-peaking and carbon-neutrality strategy,new energy will achieve leapfrog *** to the good eco.omics of distributed new-energy generation,it can not only save users’own investment,but also help to achieve local co.sumption of new ***,it will also bring about a series of incremental co.ts to the power *** paper first enumerates the co.cept,development status and scheduling mode of a distributed new-energy storage *** on the above,it establishes a new-energy power generation model and an energy storage system charging and discharging model,and proposes a global optimization scheduling model for a distributed new-energy storage system,co.sidering the time-of-use electricity price and taking the lowest total operating co.t of the distributed new-energy power generation system as the objective ***,it proposes a distribution network incremental co.t analysis model based on the penetration of distributed new *** calculation results show that the incremental co.t of grid-co.nected distributed new energy is 1.0849,1.2585 and 1.3473 yuan/kWh,respectively,which indicates that the global dispatching model can optimize the power co.sumption structure of a distributed power generation system,and has the function of peak shaving and valley filling,but the incremental co.t of the distribution network will also increase.

关键词： distributed new energy electrochemical energy storage eco.omic dispatch distribution network co.t time-sharing price

Investigating Periodic Dependencies to Improve Short-Term Load Forecasting

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Energy Engineering 2024年第3期121卷 789-806页

作者： Jialin Yu Xiaodi Zhang Qi Zhong Jian Feng State Grid Zhejiang Jiaxing electric Power co. Ltd.Jiaxing314000China State Grid Zhejiang electric Power co. Ltd.Hangzhou310000China

With a further increase in energy flexibility for customers,short-term load forecasting is essential to provide benchmarks for eco.omic dispatch and real-time alerts in power *** electrical load series exhibit periodic patterns and share high associations with metrological ***,current studies have merely focused on point-wise models and failed to sufficiently investigate the periodic patterns of load series,which hinders the further improvement of short-term load forecasting ***,this paper improved Autoformer to extract the periodic patterns of load series and learn a representative feature from deep deco.position and *** addition,a novel multi-factor attention mechanism was proposed to handle multi-source metrological and numerical weather prediction data and thus co.rect the forecasted electrical *** paper also co.pared the proposed model with various co.petitive *** the experimental results reveal,the proposed model outperforms the benchmark models and maintains stability on various types of load co.sumers.

关键词： Load forecasting transformer attention mechanism power grid

Study on the influence of mechanism dispersion on transient reco.ery voltage distribution of modular DC vacuum circuit breakers

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High Voltage 2024年第2期9卷 346-355页

作者： Chongyang Huang Yongshuai Yin Shuxin Liu Hanwen Du Zengyu Shan Yundong Cao Shurui Yang Key Laboratory of Special electric Machines and High Voltage Apparatus in the Ministry of Education Shenyang University of TechnologyShenyangChina Shenyang Power Supply co.pany of State Grid Liaoning electric Power co. LtdShenyangChina Chifeng Power Supply co.pany of State Grid Mongolia electric Power co. LtdChifengChina

A simulation analysis and an experiment are carried out to investigate how the gap difference between the breaks of a direct current vacuum circuit breakers with multi-breaks(MB-DC VCB)caused by the mechanism dispersion of the breaker influences the distribution of TRV among the *** interruption model of MB-DC VCB,co.bining the co.tinuous transition model,is established to analyse the rising rate of transient reco.ery voltage and the dielectric strength reco.ery speed of the breaks for MB-DC VCB under different gap difference *** on the experimental platform of dual break DC vacuum circuit breaker breaking,the co.rectness of the simulation model is verified on a DC VCB with the double-breaks interruption experimental ***,a model is applied to the non-synchronous interruption simulation of a DC VCB with *** relationship between the TRVs of the breaks under different gap difference co.ditions is analysed using the co.parative analysis method,obtaining the maximum gap difference at the moment of breaking *** results of this study show that large-gap breaks have a higher TRV than small-gap breaks(the fracture of the action delay module),with double fractures reaching 1.4 times and triple fractures reaching a maximum of 1.52 times;the ability of small-gap breaks to withstand TRV is weak,giving rise to re-breakdown or even interruption failure;as the number of fractures increases,the maximum gap difference also *** the synchronous interruption ability of the MB-DC VCB is co.ducive to improving the interruption performance and interruption success rate of this type of a circuit breaker.

关键词： TRV transient distribution

Thermofluidic investigations of oil natural transformer:Closed-loop modelling and experimental validation

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High Voltage 2024年第1期9卷 230-240页

作者： Yuan Li Yiran Gao Chen Wang Chao Zhu Ying Li Yuankai Wang Guanjun Zhang State Key Laboratory of electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina electric Power Research Institute of State Grid Shaanxi electric Power co. Ltd.Xi'anChina TBEA Hengyang Transformer co. Ltd.HengyangChina

Excessively high temperatures inside a power transformer can accelerate the ageing rate and even cause unplanned *** estimating the hot-spot temperature(HST)of a power transformer is important for regulating the load and ensuring long-term *** this study,a closed-loop model of a 110-kV product transformer with an oil natural/air forced(ONAF)co.ling mode is built to predict HST,in which the co.pression ratio of windings,equivalent heat source and radiator geometry are *** to the flow field of the winding,the‘dead oil zone’and reverse oil flow are observed in the horizontal oil *** accuracy of the proposed model is experimentally validated by temperature-rise *** results show that the absolute errors between the measured results and simulation are below 5°C,and the average error is~2°***,the arrangements of windings and radiators are studied to enhance the oil *** adding 5 washers to the high-voltage winding,the average temperature can be decreased by 6°C co.pared with the case without a *** the radiator can also mitigate the characteristic temperatures,and the optimal height difference between the radiator and winding centre is suggested to be 0.66 m.

关键词： winding arrangement adding

Efficiency-oriented vehicle relocation of shared autonomous electric fleet in station-based car-sharing system

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 681-699页

作者： Ning Wang Hangqi Tian Jiahui Guo Huahua Wu Jian Lyu School of Automotive Studies Tongji UniversityShanghai 201804China State Grid Zhejiang electric Power co. Ltd.Hangzhou 310007China State Grid Zhejiang electric Vehicle Service co. Ltd.Hangzhou 310012China

Long waiting delays for users and significant imbalances in vehicle distribution are bothering traditional station-based one-way electric car-sharing system *** address the problems above,a“demand forecast-station status judgement-vehicle relocation”multistage dynamic relocation algorithm based on the automatic formation cruising technology was proposed in this *** stage one,a novel trip demand forecast model based on the long short-term memory network was established to predict users'car-pickup and car-return order volumes at each *** stage two,a dynamic threshold interval was determined by co.bining the forecast results with the actual vehicle distribution among stations to evaluate the status of each *** vehicle-surplus,vehicleinsufficient,vehicle-normal stations,and the number of surplus or insufficient vehicles for each station were *** stage three,setting driving mileage and carbon emission as the optimization objectives,an integer linear programming mathematical model was co.structed and the optimal vehicle relocation scheme was obtained by the co.mercial solver *** 43 stations and 187 vehicles in Jiading District,Shanghai,China,as a case study,results showed that rapid vehicle rebalancing among stations with minimum carbon emissions co.ld be realized within 15 min and the users’car-pickup and car-return demands co.ld be fully satisfied without any refusal.

关键词： Sustainable transportation One-way car-sharing Shared autonomous electric fleet Multistage dynamic relocation algorithm

Cloud-Edge co.laborative Federated GAN Based Data Processing for IoT-Empowered Multi-Flow Integrated Energy Aggregation Dispatch

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co.puters, Materials & co.tinua 2024年第7期80卷 973-994页

作者： Zhan Shi electric Power Dispatching co.trol Center Guangdong Power Grid Co.Ltd.Guangzhou510030China

The co.vergence of Internet of Things(IoT),5G,and cloud co.laboration offers tailored solutions to the rigorous demands of multi-flow integrated energy aggregation dispatch data *** generative adversarial networks(GANs)are instrumental in resource scheduling,their application in this domain is impeded by challenges such as co.vergence speed,inferior optimality searching capability,and the inability to learn from failed decision making ***,a cloud-edge co.laborative federated GAN-based co.munication and co.puting resource scheduling algorithm with long-term co.straint violation sensitiveness is proposed to address these *** proposed algorithm facilitates real-time,energy-efficient data processing by optimizing transmission power co.trol,data migration,and co.puting resource *** employs federated learning for global parameter aggregation to enhance GAN parameter updating and dynamically adjusts GAN learning rates and global aggregation weights based on energy co.sumption co.straint *** results indicate that the proposed algorithm effectively reduces data processing latency,energy co.sumption,and co.vergence time.

关键词： IoT federated learning generative adversarial network data processing multi-flowintegration energy aggregation dispatch

RL and AHP-Based Multi-Timescale Multi-Clock Source Time Synchronization for Distribution Power Internet of Things

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co.puters, Materials & co.tinua 2024年第3期78卷 4453-4469页

作者： Jiangang Lu Ruifeng Zhao Zhiwen Yu Yue Dai Kaiwen Zeng electric Power Dispatching and co.trol Center Guangdong Power Grid Co.Ltd.Guangzhou510600China

Time synchronization(TS)is crucial for ensuring the secure and reliable functioning of the distribution power Internet of Things(IoT).Multi-clock source time synchronization(MTS)has significant advantages of high reliability and accuracy but still faces challenges such as optimization of the multi-clock source selection and the clock source weight calculation at different timescales,and the co.pling of synchronization latency jitter and pulse phase *** this paper,the multi-timescale MTS model is co.ducted,and the reinforcement learning(RL)and analytic hierarchy process(AHP)-based multi-timescale MTS algorithm is designed to improve the weighted summation of synchronization latency jitter standard deviation and average pulse phase ***,the multi-clock source selection is optimized based on Softmax in the large timescale,and the clock source weight calculation is optimized based on lower co.fidence bound-assisted AHP in the small *** shows that the proposed algorithm can effectively reduce time synchronization delay standard deviation and average pulse phase difference.

关键词： Multi-clock source time synchronization(TS) power Internet of Things reinforcement learning analytic hierarchy process

Structural and Luminescent Properties of Mg_(0.25-x)Al_(2.57)O_(3.79)N_(0.21):xMn^(2+)Green-Emitting Transparent Ceramic Phosphor

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 533-540页

作者：郝留成 MIAO Xiaojun LI Kai ZHONG Jianying 涂兵田 YANG Zhangfu 王皓 pinggao Group co. LtdPingdingshan 467001China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory Xiangyang 430070China School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China

A series of spinel-type Mg_(0.25-x)Al_(2.57)O_(3.79)N_(0.21):xMn^(2+)(MgAlON:xMn^(2+))phosphors were synthesized by the solid-state reaction *** transparent ceramic phosphors were fabricated by pressureless sintering followed by hot-isostatic pressing(HIP).The crystal structure,luminescence and mechanical properties of the samples were systematically *** transparent ceramic phosphors with tetrahedrally co.rdinated Mn^(2+)show strong green emission centered around 515 nm under blue light *** the Mn^(2+)co.centration increases,the crystal lattice expands slightly,resulting in a variation of crystal field and a slight red-shift of green emission *** weak absorption peaks in the transmittance spectra originate from the spin-forbidden ^(4)T_(1)(^(4)G)→^(6)A_(1) transition of Mn^(2+).The decay time was found to decrease from 5.66 to 5.16 ms with the Mn^(2+)*** present study co.tributes to the systematic understanding of crystal structure and properties of MgAlON:xMn^(2+)green-emitting transparent ceramic phosphor which has a potential application in high-power light-emitting diodes.

关键词： transparent ceramic phosphor green emission MgAlON photoluminescence

Optimal scheduling of flexible grid-side resources and auxiliary service co.t allocation model co.sidering renewable-energy penetration

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Clean Energy 2024年第4期8卷 90-102页

作者： Bin Bai Yanli Xiao Rui Zhao Xin Ju Shangke Liu State Grid Ningxia electric Power co. Ltd.Economic Technology Research InstituteYinchuan 750011China

Renewable energy has penetrated power grid enterprises on a large *** to the intermittency and volatility of renewable energy generation,it is necessary to build new flexible grid-side resources to ensure the safe and stable operation of the power grid,which will cause great pressure on co.t allocation for power grid *** article co.siders four types of flexible grid-side resources and co.structs a dual-level co.figuration optimization model for flexible grid-side resources under the penetration of renewable en*** on the co.figuration results,the co.t scale of flexible grid-side resources is estimated and an improved ancillary service co.t allocation model based on the Shapley value method is proposed to smooth the allocation of ancillary service co.ts in the co.t of flexible grid-side resources between the two main bodies of renewable energy and *** calculation results show that,when the penetration rate of renewable-energy power is 30%and 35%,respectively,the co.t of flexible grid-side resources is 9.606 billion yuan and 21.518 billion yuan,*** proportion of ancillary service co.ts allocated to load is relatively high-about five times that of the ancillary service co.ts allocated to renewable energy-and the higher the penetration rate of renewable energy,the higher the proportion of ancillary service co.ts allocated to renewable energy.

关键词： renewable-energy penetration flexible grid-side resources ancillary service co.ts Shapley allocation model