Cascading faults have been identified as the primary cause of multiple power outages in recent years.With the emergence of integrated energy systems(IES),the conventional approach to analyzing power grid cascading fau...Cascading faults have been identified as the primary cause of multiple power outages in recent years.With the emergence of integrated energy systems(IES),the conventional approach to analyzing power grid cascading faults is no longer appropriate.A cascading fault analysis method considering multi-energy coupling characteristics is of vital importance.In this study,an innovative analysis method for cascading faults in integrated heat and electricity systems(IHES)is proposed.It considers the degradation characteristics of transmission and energy supply com-ponents in the system to address the impact of component aging on cascading faults.Firstly,degradation models for the current carrying capacity of transmission lines,the water carrying capacity and insulation performance of thermal pipelines,as well as the performance of energy supply equipment during aging,are developed.Secondly,a simulation process for cascading faults in the IHES is proposed.It utilizes an overload-dominated development model to predict the propagation path of cascading faults while also considering network islanding,electric-heating rescheduling,and load shedding.The propagation of cascading faults is reflected in the form of fault chains.Finally,the results of cascading faults under different aging levels are analyzed through numerical examples,thereby verifying the effectiveness and rationality of the proposed model and method.展开更多
To investigate the optimum growth conditions and screen atrazine-degrading strains,two atrazine-degrading strains named Z9 and Z42 were isolated from black earth in a cold area with a long-term application of atrazine...To investigate the optimum growth conditions and screen atrazine-degrading strains,two atrazine-degrading strains named Z9 and Z42 were isolated from black earth in a cold area with a long-term application of atrazine by standard enrichment techniques.Z9 utilizes atrazine as both the nitrogen and carbon source whereas Z42 utilizes atrazine as the sole nitrogen source to grow.The atrazine degradation rates of the two strains reached 77.7%and 65.6%,respectively after 14 days culture in a liquid medium with an atrazine concentration of 100 mg/L.Z9 and Z42 were identified as Microbacterium sp.and Arthrobacter sp.The optimum inoculation amount and rotation speed for Z9 and Z42 to grow and degrade atrazine are 3%and 120 r/min respectively.展开更多
基金supported by Shanghai Rising-Star Program(No.22QA1403900)the National Natural Science Foundation of China(No.71804106)the Noncarbon Energy Conversion and Utilization Institute under the Shanghai Class IV Peak Disciplinary Development Program.
文摘Cascading faults have been identified as the primary cause of multiple power outages in recent years.With the emergence of integrated energy systems(IES),the conventional approach to analyzing power grid cascading faults is no longer appropriate.A cascading fault analysis method considering multi-energy coupling characteristics is of vital importance.In this study,an innovative analysis method for cascading faults in integrated heat and electricity systems(IHES)is proposed.It considers the degradation characteristics of transmission and energy supply com-ponents in the system to address the impact of component aging on cascading faults.Firstly,degradation models for the current carrying capacity of transmission lines,the water carrying capacity and insulation performance of thermal pipelines,as well as the performance of energy supply equipment during aging,are developed.Secondly,a simulation process for cascading faults in the IHES is proposed.It utilizes an overload-dominated development model to predict the propagation path of cascading faults while also considering network islanding,electric-heating rescheduling,and load shedding.The propagation of cascading faults is reflected in the form of fault chains.Finally,the results of cascading faults under different aging levels are analyzed through numerical examples,thereby verifying the effectiveness and rationality of the proposed model and method.
基金supported by National Natural Science Foundation(30970525)Key Science and Technology Project of China-Israel Cooperation Fund of Department of Science and Technology,Heilongjiang Province,China(WB07N01)+3 种基金National Scientific and Technological Supporting Project,China(2007BAD87B03)Natural Science Fund Project of Heilongjiang Province(E2007-16)Main Youth Fund of Department of Education of Heilongjiang Province(1152G006)Innovating Group Fund of Northeast Agricultural University(CXT003-1-2).
文摘To investigate the optimum growth conditions and screen atrazine-degrading strains,two atrazine-degrading strains named Z9 and Z42 were isolated from black earth in a cold area with a long-term application of atrazine by standard enrichment techniques.Z9 utilizes atrazine as both the nitrogen and carbon source whereas Z42 utilizes atrazine as the sole nitrogen source to grow.The atrazine degradation rates of the two strains reached 77.7%and 65.6%,respectively after 14 days culture in a liquid medium with an atrazine concentration of 100 mg/L.Z9 and Z42 were identified as Microbacterium sp.and Arthrobacter sp.The optimum inoculation amount and rotation speed for Z9 and Z42 to grow and degrade atrazine are 3%and 120 r/min respectively.
