In the context of increasing demand for flexibility and controllability in distribution networks,this paper proposes a dual-bus parallel supply(DBPS)system based on bipolar direct AC/AC conversion.First,the topology o...In the context of increasing demand for flexibility and controllability in distribution networks,this paper proposes a dual-bus parallel supply(DBPS)system based on bipolar direct AC/AC conversion.First,the topology of the DBPS system,which is composed of both conventional and flexible bus ports,is described.Then,through analyzing the principles of the DBPS sys-tem,the voltage flexible regulation range is obtained,and its superiority over a topological reciprocity system is achieved.Then,a control strategy for the DBPS system is proposed based on the theory of power flow regulation of distribution ring networks and the principles of flexible bus regulation of the DBPS system.Finally,simulation analyses on flexible control scenarios in different net-working modes of the DBPS system verify the correctness and validity of the proposed theory.展开更多
To elucidate the effect of calcite-regulated activated carbon(AC)structure on low-temperature denitrification performance of SCR catalysts,this work prepared a series of Mn-Ce/De-AC-xCaCO_(3)(x is the calcite content ...To elucidate the effect of calcite-regulated activated carbon(AC)structure on low-temperature denitrification performance of SCR catalysts,this work prepared a series of Mn-Ce/De-AC-xCaCO_(3)(x is the calcite content in coal)catalysts were prepared by the incipient wetness impregnation method,followed by acid washing to remove calcium-containing minerals.Comprehensive characterization and low-temperature denitrification tests revealed that calcite-induced structural modulation of coal-derived AC significantly enhances catalytic activity.Specifically,NO conversion increased from 88.3%of Mn-Ce/De-AC to 91.7%of Mn-Ce/De-AC-1CaCO_(3)(210℃).The improved SCR denitrification activity results from the enhancement of physicochemical properties including higher Mn^(4+)content and Ce^(4+)/Ce^(3+)ratio,an abundance of chemisorbed oxygen and acidic sites,which could strengthen the SCR reaction pathways(richer NH_(3)activated species and bidentate nitrate active species).Therefore,NO removal is enhanced.展开更多
基金supported in part by the National Natural Science Foundation of China(No.52107182).
文摘In the context of increasing demand for flexibility and controllability in distribution networks,this paper proposes a dual-bus parallel supply(DBPS)system based on bipolar direct AC/AC conversion.First,the topology of the DBPS system,which is composed of both conventional and flexible bus ports,is described.Then,through analyzing the principles of the DBPS sys-tem,the voltage flexible regulation range is obtained,and its superiority over a topological reciprocity system is achieved.Then,a control strategy for the DBPS system is proposed based on the theory of power flow regulation of distribution ring networks and the principles of flexible bus regulation of the DBPS system.Finally,simulation analyses on flexible control scenarios in different net-working modes of the DBPS system verify the correctness and validity of the proposed theory.
基金Supported by the Science and Technology Cooperation and Exchange special project of Cooperation of Shanxi Province(202404041101014)the Fundamental Research Program of Shanxi Province(202403021212333)+3 种基金the Joint Funds of the National Natural Science Foundation of China(U24A20555)the Lvliang Key R&D of University-Local Cooperation(2023XDHZ10)the Initiation Fund for Doctoral Research of Taiyuan University of Science and Technology(20242026)the Outstanding Doctor Funding Award of Shanxi Province(20242080).
文摘To elucidate the effect of calcite-regulated activated carbon(AC)structure on low-temperature denitrification performance of SCR catalysts,this work prepared a series of Mn-Ce/De-AC-xCaCO_(3)(x is the calcite content in coal)catalysts were prepared by the incipient wetness impregnation method,followed by acid washing to remove calcium-containing minerals.Comprehensive characterization and low-temperature denitrification tests revealed that calcite-induced structural modulation of coal-derived AC significantly enhances catalytic activity.Specifically,NO conversion increased from 88.3%of Mn-Ce/De-AC to 91.7%of Mn-Ce/De-AC-1CaCO_(3)(210℃).The improved SCR denitrification activity results from the enhancement of physicochemical properties including higher Mn^(4+)content and Ce^(4+)/Ce^(3+)ratio,an abundance of chemisorbed oxygen and acidic sites,which could strengthen the SCR reaction pathways(richer NH_(3)activated species and bidentate nitrate active species).Therefore,NO removal is enhanced.
