Electrically triggered Vacuum Surface Flashover Switches (VSFS) are suitable for high voltage and high power conversion applications because of their advantages of high turn-on speed, high insulation recovery speed, s...
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To address the precision limitation of traditional thermal models and the computational inefficiency of electromagnetic-thermal coupling finite element models, this work proposes a multidimensional correction-based el...
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This paper proposes an improved MultiFunction Common Mode Choke (MCMC), and designs a high energy density hybrid EMI filter (HEF). MCMC improves the suppression effect and energy density of the filter by using the Cur...
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Bipolar medium-voltage DC(MVDC)and lowvoltage DC(LVDC)grids have the advantages of flexible integration of distributed renewable-energy generation and reliable power *** order to achieve voltage conversion,power trans...
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Bipolar medium-voltage DC(MVDC)and lowvoltage DC(LVDC)grids have the advantages of flexible integration of distributed renewable-energy generation and reliable power *** order to achieve voltage conversion,power transfer,and electrical isolation for bipolar MVDC and LVDC grids,a high-power DC-DC converter is ***,this paper proposes an isolated bipolar modular multilevel DCDC converter(BiMMDC)with power self-balancing capability for interconnection of MVDC and LVDC *** proposed BiMMDC consists of two series connected MMCs in the MV stage to configure a bipolar MVDC interface,and interleaved converters combined with a dual-transformer are designed in the LV stage to configure the bipolar LVDC interface and to provide a self-balancing *** circuits of two series-connected MMCs and a dual-transformer with interleaved converters are *** that,operation principles of the proposed BiMMDC are introduced,considering balanced/unbalanced power transfer of bipolar LVDC grid and monopolar shortcircuit or open-circuit faults at MVDC *** control scheme is also presented for the proposed BiMMDC under different operating ***,a Matlab simulation and controller hardware-in-the-loop(CHIL)evaluation results are provided to validate the feasibility and effectiveness of the proposed typology and its operating performance.
With the transition to cleaner energy sources, a high proportion of renewable devices often needs to be connected to the grid through long transmission lines, which increases the risk of system instability. The system...
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High-frequency power electronic switching devices generate significant high-frequency magnetic fields in their surrounding space. High-frequency magnetic field energy harvesting devices offer higher output power densi...
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Power-to-hydrogen by electrolysis(PtHE)is a promising technology in the carbon-neutral evolution of *** not only contributes to renewable energy integration but also accelerates decarbonization in industrial sectors t...
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Power-to-hydrogen by electrolysis(PtHE)is a promising technology in the carbon-neutral evolution of *** not only contributes to renewable energy integration but also accelerates decarbonization in industrial sectors through green hydrogen *** paper presents a comprehensive review of PtHE ***,technical solutions in PtHE technology are introduced to clarify pros and cons of one ***,the multiphysics coupling and the multi-energy flow are investigated to reveal the insight mechanism during operation of compactly assembled industrial PtHE ***,the development trends of core components in PtHE plants,including electrocatalysts,electrode plates and operation strategy,are reviewed,*** thrusts needed for PtHE in carbon-neutral transition are also ***,three configurations of the PtHE plant in energy system integration are introduced,which can achieve renewable energy integration and efficient energy *** Terms-Carbon neutrality,power-to-hydrogen nby electrolysis(PtHE),multiphysics coupling,multidisciplinary.
Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for...
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Explorations into new electrolytes have highlighted the critical impact of solvation structure on battery performance,Classical molecular dynamics(CMD)using semi-empirical force fields has become an essential tool for simulating solvation ***,mainstream force fields often lack accuracy in describing strong ion-solvent interactions,causing disparities between CMD simulations and experimental *** some empirical methods have been employed in some of the studies to address this issue,their effectiveness has been *** CMD research,supported by quantum chemical calculations and experimental data,reveals that the solvation structure is influenced not only by the charge model but also by the polarization *** empirical approaches that focused solely on adjusting ion-solvent interaction strengths overlooked the importance of polarization *** on this insight,we propose integrating the Drude polarization model into mainstream force fields and verify its feasibility in carbonate,ether,and nitrile *** experimental results demonstrate that this approach significantly enhances the accuracy of CMD-simulated solvation *** work is expected to provide a more reliable CMD method for electrolyte design,shielding researchers from the pitfalls of erroneous simulation outcomes.
Typhoons can cause large-area blackouts or partial outages of distribution *** define a partial outage state in the distribution network as a gray state and propose a gray-start strategy and two-stage distribution net...
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Typhoons can cause large-area blackouts or partial outages of distribution *** define a partial outage state in the distribution network as a gray state and propose a gray-start strategy and two-stage distribution network emergency recovery framework.A phase-space reconstruction and stacked integrated model for predicting wind and photovoltaic generation during typhoon disasters is proposed in the first *** provides guidance for second-stage post-disaster emergency recovery *** emergency recovery scheduling model is established in the second stage,and this model is supported by a thermal power-generating unit,mobile emergency generators,and distributed *** generation includes wind power generation,photovoltaics,fuel cells,***,we con-sider the gray-start based on the pumped storage unit to be an important first step in the emergency recovery *** model is val-idated on the improved IEEE 33 node system,which utilizes data from the 2022 super typhoon“Muifa”in Zhoushan,Zhejiang,*** indicate the superiority of a gray start with a pumped storage unit and the proposed emergency recovery strategy.
Generator tripping scheme(GTS)is the most commonly used scheme to prevent power systems from losing safety and ***,GTS is composed of offline predetermination and real-time scenario ***,it is extremely time-consuming ...
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Generator tripping scheme(GTS)is the most commonly used scheme to prevent power systems from losing safety and ***,GTS is composed of offline predetermination and real-time scenario ***,it is extremely time-consuming and labor-intensive for manual predetermination for a large-scale modern power *** improve efficiency of predetermination,this paper proposes a framework of knowledge fusion-based deep reinforcement learning(KF-DRL)for intelligent predetermination of ***,the Markov Decision Process(MDP)for GTS problem is formulated based on transient instability ***,linear action space is developed to reduce dimensionality of action space for multiple controllable ***,KF-DRL leverages domain knowledge about GTS to mask invalid actions during the decision-making *** can enhance the efficiency and learning ***,the graph convolutional network(GCN)is introduced to the policy network for enhanced learning *** simulation results obtained on New England power system demonstrate superiority of the proposed KF-DRL framework for GTS over the purely data-driven DRL method.
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