该文通过分析三重移相(triple phase shift,TPS)控制下双主动全桥(dual active bridge,DAB)变换器的等效电路,推导出传输功率以及电感电流有效值与控制量输入之间的统一模型,并根据控制量之间的关系,划分DAB变换器的6种工作模式。然后,...该文通过分析三重移相(triple phase shift,TPS)控制下双主动全桥(dual active bridge,DAB)变换器的等效电路,推导出传输功率以及电感电流有效值与控制量输入之间的统一模型,并根据控制量之间的关系,划分DAB变换器的6种工作模式。然后,通过揭示控制量的扰动对于传输功率及电感电流有效值的影响,提出针对电流有效值的全局最优化条件,统一不同功率段和不同工作模式的优化问题。全局最优化条件的解即为电感电流有效值最小的控制策略。最后搭建实验平台进行验证,实验结果证明了文中理论分析的正确性和控制策略的有效性。展开更多
In this study,the super typhoon KROSA(2007)was simulated using a mesoscale numerical model Global and Regional Assimilation and Prediction System(GRAPES)with a two-moment mixed-phase microphysics scheme.Local rainfall...In this study,the super typhoon KROSA(2007)was simulated using a mesoscale numerical model Global and Regional Assimilation and Prediction System(GRAPES)with a two-moment mixed-phase microphysics scheme.Local rainfall observations,radar and satellite data were also used to analyze the precipitation structure and microphysical features.It was shown that low-level jets and unstable temperature stratification provided this precipitation process with favorable weather condition.Heavy rainfall centers were located in the north and east part of KROSA with the maxima of 6-hourly total rainfall during the simulation more than 100 mm.The quantities of column solid water and column liquid water were generally equivalent,indicating the important role of ice phase in precipitation formation.Results of CloudSat showed that strong convection occurred in the eyewall around the cyclonic center.According to the simulation results,heavy precipitation in the northeast part of the typhoon was mainly triggered by convective clouds,accompanied by the strongest updraft under the melting level.In the southwest part of KROSA,precipitation intensity was rather homogeneous.The ascending center occurred in high-level cold clouds,favoring the formation and growth of ice particles.展开更多
文摘该文通过分析三重移相(triple phase shift,TPS)控制下双主动全桥(dual active bridge,DAB)变换器的等效电路,推导出传输功率以及电感电流有效值与控制量输入之间的统一模型,并根据控制量之间的关系,划分DAB变换器的6种工作模式。然后,通过揭示控制量的扰动对于传输功率及电感电流有效值的影响,提出针对电流有效值的全局最优化条件,统一不同功率段和不同工作模式的优化问题。全局最优化条件的解即为电感电流有效值最小的控制策略。最后搭建实验平台进行验证,实验结果证明了文中理论分析的正确性和控制策略的有效性。
基金"Abnormal Changes and Mechanism Study Before and After Typhoon Landing"(2009CB421500)from the National Key Basic Research Program(973 Program)
文摘In this study,the super typhoon KROSA(2007)was simulated using a mesoscale numerical model Global and Regional Assimilation and Prediction System(GRAPES)with a two-moment mixed-phase microphysics scheme.Local rainfall observations,radar and satellite data were also used to analyze the precipitation structure and microphysical features.It was shown that low-level jets and unstable temperature stratification provided this precipitation process with favorable weather condition.Heavy rainfall centers were located in the north and east part of KROSA with the maxima of 6-hourly total rainfall during the simulation more than 100 mm.The quantities of column solid water and column liquid water were generally equivalent,indicating the important role of ice phase in precipitation formation.Results of CloudSat showed that strong convection occurred in the eyewall around the cyclonic center.According to the simulation results,heavy precipitation in the northeast part of the typhoon was mainly triggered by convective clouds,accompanied by the strongest updraft under the melting level.In the southwest part of KROSA,precipitation intensity was rather homogeneous.The ascending center occurred in high-level cold clouds,favoring the formation and growth of ice particles.
