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Hybrid Network Model Based on Data Enhancement for Short-term Power Prediction of New PV Plants

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Journal of Modern Power Systems and Clean energy 2024年第1期12卷 77-88页

作者： Shangpeng Zhong Xiaoming Wang Bin Xu Hongbin Wu Ming Ding the anhui province key laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefei 230009China the State Grid anhui Electric Power Research Institute Hefei 230061China

This study proposes a hybrid network model based on data enhancement to address the problem of low accuracy in photovoltaic(PV)power prediction that arises due to insuffi cient data samples for new PV ***,a time-series gener ative adversarial network(TimeGAN)is used to learn the distri bution law of the original PV data samples and the temporal correlations between their features,and these are then used to generate new samples to enhance the training ***,a hybrid network model that fuses bi-directional long-short term memory(BiLSTM)network with attention mechanism(AM)in the framework of deep&cross network(DCN)is con structed to effectively extract deep information from the origi nal features while enhancing the impact of important informa tion on the prediction ***,the hyperparameters in the hybrid network model are optimized using the whale optimi zation algorithm(WOA),which prevents the network model from falling into a local optimum and gives the best prediction *** simulation results show that after data enhance ment by TimeGAN,the hybrid prediction model proposed in this paper can effectively improve the accuracy of short-term PV power prediction and has wide applicability.

关键词： New photovoltaic(PV)plant short-term predic tion time-series generative adversarial network(TimeGAN) hy brid network hyperparameter

Research on the dynamic characteristics of electric field distribution of the±1100 kV Ultra high voltage converter transformer valve‐side bushing using weakly ionised gas conductance model

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High Voltage 2022年第2期7卷 288-301页

作者： Qingyu Wang Peng Liu Huidong Tian Gengsheng Xie Zongren Peng Xi Yang State key laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina anhui Provincial laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefeiAnhuiChina

Ultra high voltage(UHV)converter transformer valve‐side bushings are the key equipment indirect current(DC)transmission projects,and are subjected to high voltage and large current with large number of harmonics *** electric field distribution of converter transformer valve‐side bushings is time‐dependent under DC voltage,polarity reversal voltage and actual voltage waveforms,and the electric and temperature field are coupling with each other in actual *** dynamic char-acteristics of the surface charges and the electric field distribution of China's first�1100 kV epoxy/paper-SF6 composite insulation converter trans former valve‐side bushing under 2 h DC withstand test voltage and polarity reversal voltage were analysed considering the natural ionisation,drifting,diffusion and recombination processes of positive and negative ions in SF6 gas and *** time‐dependent electro‐thermal coupling field of the bushing under the actual voltage waveform in one cycle was *** rationality of the simulation method adopted was verified through type tests of the UHV converter transformer valve‐side *** simulation results of the paper can provide a theoretical foundation for the design of converter transformer valve‐side bushings and it is of great significance to ensure the safe operation of converter stations.

关键词： converter distribution field

Inverse Proportion Technique Based Scheduling Strategy for energy Storage System Considering Load Demand Differences

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CSEE Journal of Power and energy Systems 2022年第5期8卷 1487-1496页

作者： Hejun Yang Zhenyu Hao Yinghao Ma Dabo Zhang anhui Provincial key laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefei 230009China State key laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044Chin

The energy storage system(ESS)as a demand-side management(DSM)resource can effectively smooth the load power fluctuation of a power ***,designing a more reasonable ESS operational strategy will be a prerequisite before incorporating the energy storage device into *** different load levels have different demands for the real-time chargedischarge power of an ESS,this paper proposes a heuristic ESS operation scheduling strategy which can take into account the electrical load demand *** this paper,firstly,two demand degree concepts for charging power and discharging power are defined to describe the differentiated ESS demand under the condition of different electrical load ***,an inverse proportion technique based ESS scheduling strategy,with the consideration of the load demand difference,is proposed in this ***,some evaluating indices are defined in this paper for describing the influence of the proposed strategy on the smoothing degree of the daily load ***,several case studies are designed to verify the validity and correctness of the proposed technique,and the results show that the proposed technique can effectively smooth the load curve and improve the ability of peak shaving and valley filling.

关键词： Demand response energy storage system load demand difference operation scheduling strategy peak shaving and valley filling

Integrated Planning of an Active Distribution Network and DG Integration in Clusters Considering a Novel Formulation for Reliability Assessment

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CSEE Journal of Power and energy Systems 2023年第2期9卷 561-576页

作者： Di Hu Lei Sun Ming Ding School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China anhui Provincial laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefei 230009China

The concept of DG clusters is introduced with highly penetrated integration of distributed generation(DG)into active distribution networks(ADNs).DG clusters are referred to as parts of an ADN,including DGs,distribution lines and *** formation of DG clusters helps to optimally dispatch DG outputs within *** this regard,an integrated planning strategy of ADNs and DGs in cluster(IPNDGC)is *** order to guarantee that the planning strategy meets the reliability requirements,a reliability assessment is considered in the proposed ***,reliability assessment is generally accomplished according to a fixed network topology and known DG allocation,which makes it difficult to integrate reliability into planning *** deal with this difficulty,a novel formulation method for reliability assessment is proposed considering the network topology uncertainties and isolated operating probabilities of DG *** reliability index(RI)represented by expected customer interruption cost(ECOST)is employed in the proposed planning *** planning model is formulated as a mixed integer second order conic programming planning *** actual distribution system is employed to illustrate the accuracy and efficiency of the proposed planning model.

关键词： DG cluster distribution network planning reliability

Optimization dispatching strategy for an energy storage system considering its unused capacity sharing

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Global energy Interconnection 2024年第5期7卷 590-602页

作者： Hejun Yang Zhaochen Yang Siyang Liu Dabo Zhang Yun Yu anhui province key laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefei 230009P.R.China State key laboratory of Operation and Control of renewable energy&Storage Systems China Electric Power Research InstituteBeijing 100192P.R.China Department of energy Technology Aalborg UniversityAalborg 9220Denmark

In renewable energy systems,energy storage systems can reduce the power fluctuation of renewable energy sources and compensate for the prediction ***,if the renewable energy prediction deviation is small,the energy storage system may work in an underutilized *** efficiently utilize a renewable-energy-sided energy storage system(RES),this study proposed an optimization dispatching strategy for an energy storage system considering its unused capacity ***,this study proposed an unused capacity-sharing strategy for the RES to fully utilize the storage’s unused capacity and elevate the storage’s service ***,RES was divided into“deviation-compensating energy storage(DES)”and“sharing energy storage(SES)”to clarify the function of RES in the operation ***,this study established an optimized dispatching model to achieve the lowest system operating cost wherein the unused capacity-sharing strategy could be ***,a case study was investigated,and the results indicated that the proposed model and algorithm effectively improved the utilization of renewable-energy-side energy storage systems,thereby reducing the total operation cost and pressure on peak shaving.

关键词： renewable energy energy storage system Sharing energy storage Power system dispatching Peak shaving

Bi-objective Layout Optimization for Multiple Wind Farms Considering Sequential Fluctuation of Wind Power Using Uniform Design

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CSEE Journal of Power and energy Systems 2022年第6期8卷 1623-1635页

作者： Yinghao Ma Kaigui Xie Yanan Zhao Hejun Yang Dabo Zhang anhui province key laboratory of renewable energy utilization and energy saving Hefei University of TechnologyHefei 230009China State key laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing 400044China School of Computer Science and Technology at University of Science and Technology of China Hefei 230027China

The fluctuation of wind power brings great challenges to the secure,stable,and cost-efficient operation of the power *** of the time-correlation of wind speed and the wake effect of wind turbines,the layout of wind farm has a significant impact on the wind power sequential *** order to reduce the fluctuation of wind power and improve the operation security with lower operating cost,a bi-objective layout optimization model for multiple wind farms considering the sequential fluctuation of wind power is proposed in this *** goal is to determine the optimal installed capacity of wind farms and the location of wind *** proposed model maximizes the energy production and minimizes the fluctuation of wind power *** improve the accuracy of wind speed estimation and hence the power calculation,the timeshifting of wind speed between the wind tower and turbines’locations is also considered.A uniform design based two-stage genetic algorithm is developed for the solution of the proposed *** studies demonstrate the effectiveness of this proposed model.

关键词： Wind farm layout optimization(WFLO) wind power fluctuation bi-objective optimization uniform design

Products and production routes for the catalytic conversion of seed oil into fuel and chemicals: a comprehensive review

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Science China Chemistry 2015年第7期58卷 1110-1121页

作者： Mazloom Shah Jian-Jun Dai Qing-Xiang Guo Yao Fu anhui province key laboratory of Biomass Clean energy Department of Chemistry University of Science and Technology of China

With the depletion of fossil resources, there is a need to find alternative resources of fuels and chemicals. The use of renewable feedstock such as those from seed oil processing is one of the best available resources that have come to the fore-front recently. This paper critically analyzes and highlights major factors in the biodiesel industry, such as seeds oil composition, production methods, properties of biodiesel, problems and potential solutions of using vegetable seed oil, the composition, quality and effective utilization of crude glycerol, the catalytic conversion of glycerol into possible fuels and chemicals.

关键词： seed oil catalytic conversion biodiesel glycerol fuels and chemicals

Synthesis of dihydrocapsaicin and dihydrocapsiate exclusively from lignocellulosic platform chemicals

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Green energy & Environment 2022年第3期7卷 519-524页

作者： Yan-Bing Li Hui-Ying Guo Chen-Qiang Deng Jin Deng Hefei National laboratory for Physical Sciences at the Microscale IChemCAS Key Laboratory of Urban Pollutant ConversionAnhui Province Key Laboratory of Biomass Clean EnergyDepartment of ChemistryUniversity of Science and Technology of ChinaHefeiAnhui230026China CAS key laboratory of renewable energy Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhouGuangdong510640China

Biorefinery is pivotal to the sustainability of modern chemical ***,since biomass is oxygen-enriched,new and green chemical strategies are required for expanding the biomass derived chemical *** this work,synthesis of natural products dihydrocapsaicin and dihydrocapsiate was achieved exclusively from lignocellulosic platform *** products dihydrocapsaicin and dihydrocapsiate were synthesized exclusively from lignocellulosic platform chemicals,using furfural(from hemicellulose)and methyl isopropyl ketone(from cellulose)through aldol condensation-hydrolysis-hydrodeoxygenation to synthesize 8-methylnonanoic acid and then combined with vanillin derivates(from lignin).This synthesis demonstrates the feasibility of constructing natural products entirely from renewable biomass platform through green *** utilization of inherent functional groups of biomass demonstrates their potential to open up chemical space.

关键词： space synthesis hydrolysis

Optimal day-ahead scheduling strategy of microgrid considering regional pollution and potential load curtailment

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Global energy Interconnection 2024年第6期7卷 749-760页

作者： Xie, Xinghua Yang, Hejun Wang, Bo Ma, Yinghao Zhang, Dabo Shen, Yuming anhui province key laboratory of renewable energy utilization and energy saving Hefei University of Technology Hefei 230009 China Hangzhou Science and Technology development branch Zhejiang Dayou Industrial Co. Ltd. Zhejiang Hangzhou 310051 China Institute of Economy and Technology State Grid Anhui Electric Power Co. Ltd. Hefei 230071 China

With the frequent occurrence of global warming and extreme severe weather, the transition of energy to cleaner, and with lower carbon has gradually become a consensus. Microgrids can integrate multiple energy sources and consume renewable energy locally. The amount of pollutants emitted during the operation of the microgrids become an important issue to be considered. This study proposes an optimal day-ahead scheduling strategy of microgrid considering regional pollution and potential load curtailment. First, considering the operating characteristics of microgrids in islanded and grid- connected operation modes, this study proposes a regional pollution index (RPI) to quantify the impact of pollutants emitted from microgrid on the environment, and further proposes a penalty mechanism based on the RPI to reduce the microgrid's utilization on non-clean power supplies. Second, considering the benefits of microgrid as the operating entity, utilizing a direct load control (DLC) enables microgrid to enhance power transfer capabilities to the grid under the penalty mechanism based on RPI. Finally, an optimal day-ahead scheduling strategy which considers both the load curtailment potential of curtailable loads and RPI is proposed, and the results show that the proposed optimal day-ahead scheduling strategy can effectively inspire the curtailment potential of curtailable loads in the microgrid, reducing pollutant emissions from the microgrid. © 2024

关键词： Microgrid Demand response Direct load control Pollutant emission