Aiming at the problems of increasing uncertainty of low-carbon generation energy in active distribution network(ADN)and the difficulty of security assessment of distribution network,this paper proposes a two-phase sch...Aiming at the problems of increasing uncertainty of low-carbon generation energy in active distribution network(ADN)and the difficulty of security assessment of distribution network,this paper proposes a two-phase scheduling model for flexible resources in ADN based on probabilistic risk perception.First,a full-cycle probabilistic trend sequence is constructed based on the source-load historical data,and in the day-ahead scheduling phase,the response interval of the flexibility resources on the load and storage side is optimized based on the probabilistic trend,with the probability of the security boundary as the security constraint,and with the economy as the objective.Then in the intraday phase,the core security and economic operation boundary of theADNis screened in real time.Fromthere,it quantitatively senses the degree of threat to the core security and economic operation boundary under the current source-load prediction information,and identifies the strictly secure and low/high-risk time periods.Flexibility resources within the response interval are dynamically adjusted in real-time by focusing on high-risk periods to cope with future core risks of the distribution grid.Finally,the improved IEEE 33-node distribution system is simulated to obtain the flexibility resource scheduling scheme on the load and storage side.Thescheduling results are evaluated from the perspectives of risk probability and flexible resource utilization efficiency,and the analysis shows that the scheduling model in this paper can promote the consumption of low-carbon energy from wind and photovoltaic sourceswhile reducing the operational risk of the distribution network.展开更多
The paper tries to analyze speech perception in terms of its structure, process, levels and models. Some problems concerning speech perception have been touched upon. The paper aims at providing some reference for ora...The paper tries to analyze speech perception in terms of its structure, process, levels and models. Some problems concerning speech perception have been touched upon. The paper aims at providing some reference for oral English teaching and learning in the light of speech perception. It is intended to arouse readers' reflection upon the effect of speech perception on oral English teaching.展开更多
This article presents a tentative analysis of the preliminary stage of speech perception, primarily concerning its process,complexity and theory models. Some problems related to language perception have been as well e...This article presents a tentative analysis of the preliminary stage of speech perception, primarily concerning its process,complexity and theory models. Some problems related to language perception have been as well explored. Finally some suggestions based on the present investigations have been proposed to the present English speaking teaching based on lexical chunks.展开更多
基金supported by Key Technology Research and Application of Online Control Simulation and Intelligent Decision Making for Active Distribution Network(5108-202218280A-2-377-XG).
文摘Aiming at the problems of increasing uncertainty of low-carbon generation energy in active distribution network(ADN)and the difficulty of security assessment of distribution network,this paper proposes a two-phase scheduling model for flexible resources in ADN based on probabilistic risk perception.First,a full-cycle probabilistic trend sequence is constructed based on the source-load historical data,and in the day-ahead scheduling phase,the response interval of the flexibility resources on the load and storage side is optimized based on the probabilistic trend,with the probability of the security boundary as the security constraint,and with the economy as the objective.Then in the intraday phase,the core security and economic operation boundary of theADNis screened in real time.Fromthere,it quantitatively senses the degree of threat to the core security and economic operation boundary under the current source-load prediction information,and identifies the strictly secure and low/high-risk time periods.Flexibility resources within the response interval are dynamically adjusted in real-time by focusing on high-risk periods to cope with future core risks of the distribution grid.Finally,the improved IEEE 33-node distribution system is simulated to obtain the flexibility resource scheduling scheme on the load and storage side.Thescheduling results are evaluated from the perspectives of risk probability and flexible resource utilization efficiency,and the analysis shows that the scheduling model in this paper can promote the consumption of low-carbon energy from wind and photovoltaic sourceswhile reducing the operational risk of the distribution network.
文摘The paper tries to analyze speech perception in terms of its structure, process, levels and models. Some problems concerning speech perception have been touched upon. The paper aims at providing some reference for oral English teaching and learning in the light of speech perception. It is intended to arouse readers' reflection upon the effect of speech perception on oral English teaching.
文摘This article presents a tentative analysis of the preliminary stage of speech perception, primarily concerning its process,complexity and theory models. Some problems related to language perception have been as well explored. Finally some suggestions based on the present investigations have been proposed to the present English speaking teaching based on lexical chunks.
