With the increasing share of wind power,it is expected that wind turbines would provide frequency regulation ancillary service.However,the complex wake effect intensifies the difficulty in controlling wind turbines an...With the increasing share of wind power,it is expected that wind turbines would provide frequency regulation ancillary service.However,the complex wake effect intensifies the difficulty in controlling wind turbines and evaluating the frequency regulation potential from the wind farm.We propose a novel frequency control scheme for doubly-fed induction generator(DFIG)-based wind turbines,in which the wake effect is considered.The proposed control scheme is developed by incorporating the virtual inertia control and primary frequency control in a holistic way.To facilitate frequency regulation in timevarying operation status,the control gains are adaptively adjusted according to wind turbine operation status in the proposed controller.Besides,different kinds of power reserve control approaches are explicitly investigated.Finally,extensive case studies are conducted and simulation results verify that the frequency behavior is significantly improved via the proposed control scheme.展开更多
Coronary artery disease(CAD),the most common type of cardiovascular disease(CVD),remains the leading cause of mortality in both developing and developed countries,accounting for approximately 17.3 million deaths in 20...Coronary artery disease(CAD),the most common type of cardiovascular disease(CVD),remains the leading cause of mortality in both developing and developed countries,accounting for approximately 17.3 million deaths in 2013,higher than the data in 1990.111 The American College of Cardiology(ACC)/American Heart Association(AHA)score is one of the typical and accurate model to evaluate the 10-year risk of a first hard atherosclerotic cardiovascular disease(ASCVD)event based on a sex-and-race large Pooled Cohort study.Moreover,the present study aimed to investigate the association between the ACC/AHA risk score and the Gensini Score(GS)system,and determine whether ACC/AHA score could predict the presence and severity of CAD.展开更多
Multiple epiphyseal dysplasia （MED; EDMI, OMIM 132400; EDM2, OMIM 600204; EDM3, OMIM 600969; EDM4, OMIM 226900; EDM5~ OMIM 607078; EDM6, OMIM 614135） is an autosomal dominant inherited disease of the skeletal system...Multiple epiphyseal dysplasia （MED; EDMI, OMIM 132400; EDM2, OMIM 600204; EDM3, OMIM 600969; EDM4, OMIM 226900; EDM5~ OMIM 607078; EDM6, OMIM 614135） is an autosomal dominant inherited disease of the skeletal system, characterized by mild short stature and early-onset degenerative joint disease, caused by heterogeneous genotypes involving more than six genes （COMP, COL9A 1, COL9A2, COL9A3, MATN3, DTDST）.However, in approximately 10-20% of all samples analyzed, a mutation cannot be identified in any of the six genes mentioned above, suggesting that the presence of other unidentified causative genes is also involved in the pathogenesis of MED.展开更多
As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand satisfaction.However,the intermittency of renewables and temporal uncert...As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand satisfaction.However,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale microgrids.Instead of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally efficient.Extensive case studies were conducted using 3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.展开更多
基金This work was partially supported by Natural Science Foundation of China(No.72071100)Guangdong Basic and Applied Basic Research Fund(No.2019A1515111173)Department of Education of Guangdong Province,and Young Talent Program(No.2018KQNCX223).
文摘With the increasing share of wind power,it is expected that wind turbines would provide frequency regulation ancillary service.However,the complex wake effect intensifies the difficulty in controlling wind turbines and evaluating the frequency regulation potential from the wind farm.We propose a novel frequency control scheme for doubly-fed induction generator(DFIG)-based wind turbines,in which the wake effect is considered.The proposed control scheme is developed by incorporating the virtual inertia control and primary frequency control in a holistic way.To facilitate frequency regulation in timevarying operation status,the control gains are adaptively adjusted according to wind turbine operation status in the proposed controller.Besides,different kinds of power reserve control approaches are explicitly investigated.Finally,extensive case studies are conducted and simulation results verify that the frequency behavior is significantly improved via the proposed control scheme.
基金This work was supported by the grants from the National Natural Science Foundation of China(No.81500212 and No.81800212)Zhejiang Natural Science Foundation(No.LY18H020007 and No.LQ17H020002)。
文摘Coronary artery disease(CAD),the most common type of cardiovascular disease(CVD),remains the leading cause of mortality in both developing and developed countries,accounting for approximately 17.3 million deaths in 2013,higher than the data in 1990.111 The American College of Cardiology(ACC)/American Heart Association(AHA)score is one of the typical and accurate model to evaluate the 10-year risk of a first hard atherosclerotic cardiovascular disease(ASCVD)event based on a sex-and-race large Pooled Cohort study.Moreover,the present study aimed to investigate the association between the ACC/AHA risk score and the Gensini Score(GS)system,and determine whether ACC/AHA score could predict the presence and severity of CAD.
文摘Multiple epiphyseal dysplasia （MED; EDMI, OMIM 132400; EDM2, OMIM 600204; EDM3, OMIM 600969; EDM4, OMIM 226900; EDM5~ OMIM 607078; EDM6, OMIM 614135） is an autosomal dominant inherited disease of the skeletal system, characterized by mild short stature and early-onset degenerative joint disease, caused by heterogeneous genotypes involving more than six genes （COMP, COL9A 1, COL9A2, COL9A3, MATN3, DTDST）.However, in approximately 10-20% of all samples analyzed, a mutation cannot be identified in any of the six genes mentioned above, suggesting that the presence of other unidentified causative genes is also involved in the pathogenesis of MED.
基金partially supported by Hong Kong RGC Theme-based Research Scheme(No.T23-407/13N and No.T23-701/14N)SUSTech Faculty Startup Funding(No.Y01236135 and No.Y01236235).
文摘As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand satisfaction.However,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale microgrids.Instead of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally efficient.Extensive case studies were conducted using 3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.
