We designed an improved direct-current capacitor voltage balancing control model predictive control(MPC)for single-phase cascaded H-bridge multilevel photovoltaic(PV)inverters.Compared with conventional voltage balanc...We designed an improved direct-current capacitor voltage balancing control model predictive control(MPC)for single-phase cascaded H-bridge multilevel photovoltaic(PV)inverters.Compared with conventional voltage balanc-ing control methods,the method proposed could make the PV strings of each submodule operate at their maximum power point by independent capacitor voltage control.Besides,the predicted and reference value of the grid-connected current was obtained according to the maximum power output of the maximum power point tracking.A cost function was con-structed to achieve the high-precision grid-connected control of the CHB inverter.Finally,the effectiveness of the proposed control method was verified through a semi-physical simulation platform with three submodules.展开更多
COVID-19 is now rapidly spreading worldwide.While the majority of COVID-19 patients show only mild or moderate symptoms,some could deteriorate quickly and may succumb to a sudden death.It is therefore important to ide...COVID-19 is now rapidly spreading worldwide.While the majority of COVID-19 patients show only mild or moderate symptoms,some could deteriorate quickly and may succumb to a sudden death.It is therefore important to identify who will be more likely to develop severe outcomes and be treated with particular or preventive care.Here in this literature survey,we collected epidemiologic and clinical data from 36 articles on 51,270 patients with different severity of COVID-19,aiming to characterize the population that are prone to severe condition and bad outcomes.These data reveal that old males and those with high BMI or underlying diseases,especially cardiovascular disease,hypertension and diabetes,are overrepresented among severe cases.High leukocyte and lymphopenia are common features in severe and critical patients.Upon deterioration of the disease,both CD4^(+) and CD8^(+)T cells are decreased,while almost all serum cytokines,especially pro-inflammatory cytokines,increased.展开更多
基金Research on Control Methods and Fault Tolerance of Multilevel Electronic Transformers for PV Access(Project number:042300034204)Research on Open-Circuit Fault Diagnosis and Seamless Fault-Tolerant Control of Multiple Devices in Modular Multilevel Digital Power Amplifiers(Project number:202203021212210)Research on Key Technologies and Demonstrations of Low-Voltage DC Power Electronic Converters Based on SiC Devices Access(Project number:202102060301012)。
文摘We designed an improved direct-current capacitor voltage balancing control model predictive control(MPC)for single-phase cascaded H-bridge multilevel photovoltaic(PV)inverters.Compared with conventional voltage balanc-ing control methods,the method proposed could make the PV strings of each submodule operate at their maximum power point by independent capacitor voltage control.Besides,the predicted and reference value of the grid-connected current was obtained according to the maximum power output of the maximum power point tracking.A cost function was con-structed to achieve the high-precision grid-connected control of the CHB inverter.Finally,the effectiveness of the proposed control method was verified through a semi-physical simulation platform with three submodules.
基金This work was supported by grants from the National Natural Science Foundation of China(No.91749205)China Ministry of Science and Technology(No.2016YFE0108700)to J.D.J.H.
文摘COVID-19 is now rapidly spreading worldwide.While the majority of COVID-19 patients show only mild or moderate symptoms,some could deteriorate quickly and may succumb to a sudden death.It is therefore important to identify who will be more likely to develop severe outcomes and be treated with particular or preventive care.Here in this literature survey,we collected epidemiologic and clinical data from 36 articles on 51,270 patients with different severity of COVID-19,aiming to characterize the population that are prone to severe condition and bad outcomes.These data reveal that old males and those with high BMI or underlying diseases,especially cardiovascular disease,hypertension and diabetes,are overrepresented among severe cases.High leukocyte and lymphopenia are common features in severe and critical patients.Upon deterioration of the disease,both CD4^(+) and CD8^(+)T cells are decreased,while almost all serum cytokines,especially pro-inflammatory cytokines,increased.
