In this paper, we study the existence of solutions for 2l order (n × n) cooperative systems governed by Dirichlet and Neumann problems involving hyperbolic operators with an infinite number of variables and with ...In this paper, we study the existence of solutions for 2l order (n × n) cooperative systems governed by Dirichlet and Neumann problems involving hyperbolic operators with an infinite number of variables and with variable coefficients. The necessary and sufficient conditions for optimality of the distributed control with constraints are obtained and the set of inequalities that defining the optimal control of these systems are also obtained.展开更多
To further investigate car-following behaviors in the cooperative adaptive cruise control（CACC） strategy,a comprehensive control system which can handle three traffic conditions to guarantee driving efficiency and s...To further investigate car-following behaviors in the cooperative adaptive cruise control（CACC） strategy,a comprehensive control system which can handle three traffic conditions to guarantee driving efficiency and safety is designed by using three CACC models.In this control system,some vital comprehensive information,such as multiple preceding cars’ speed differences and headway,variable safety distance（VSD） and time-delay effect on the traffic current and the jamming transition have been investigated via analytical or numerical methods.Local and string stability criterion for the velocity control（VC） model and gap control（GC） model are derived via linear stability theory.Numerical simulations are conducted to study the performance of the simulated traffic flow.The simulation results show that the VC model and GC model can improve driving efficiency and suppress traffic congestion.展开更多
当微电网由并网模式进入离网模式时,储能变流器和光伏逆变器采用传统控制方式可能会造成微电网系统振荡、储能系统过充和过放的问题。采用储能变流器和光伏逆变器并联运行的微电网结构,通过分析微电网各电源出力情况,提出一种在微电网...当微电网由并网模式进入离网模式时,储能变流器和光伏逆变器采用传统控制方式可能会造成微电网系统振荡、储能系统过充和过放的问题。采用储能变流器和光伏逆变器并联运行的微电网结构,通过分析微电网各电源出力情况,提出一种在微电网离网时刻,考虑储能系统荷电状态(State of charge,SOC)的变主从协同控制策略,即将主从控制、对等控制、分层控制的优势结合起来,实现储能变流器在二次调压调频的下垂控制和PQ控制间灵活切换,实现微电网的平滑离网,防止储能系统过充和过放。最后搭建仿真模型,对所提方法的有效性进行验证。展开更多
文摘In this paper, we study the existence of solutions for 2l order (n × n) cooperative systems governed by Dirichlet and Neumann problems involving hyperbolic operators with an infinite number of variables and with variable coefficients. The necessary and sufficient conditions for optimality of the distributed control with constraints are obtained and the set of inequalities that defining the optimal control of these systems are also obtained.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.71571107 and 11302110)The Scientific Research Fund of Zhejiang Province,China(Grant Nos.LY15A020007,LY15E080013,and LY16G010003)+2 种基金The Natural Science Foundation of Ningbo City(Grant Nos.2014A610030and 2015A610299)the Fund from the Government of the Hong Kong Administrative Region,China(Grant No.City U11209614)the K C Wong Magna Fund in Ningbo University,China
文摘To further investigate car-following behaviors in the cooperative adaptive cruise control（CACC） strategy,a comprehensive control system which can handle three traffic conditions to guarantee driving efficiency and safety is designed by using three CACC models.In this control system,some vital comprehensive information,such as multiple preceding cars’ speed differences and headway,variable safety distance（VSD） and time-delay effect on the traffic current and the jamming transition have been investigated via analytical or numerical methods.Local and string stability criterion for the velocity control（VC） model and gap control（GC） model are derived via linear stability theory.Numerical simulations are conducted to study the performance of the simulated traffic flow.The simulation results show that the VC model and GC model can improve driving efficiency and suppress traffic congestion.
文摘当微电网由并网模式进入离网模式时,储能变流器和光伏逆变器采用传统控制方式可能会造成微电网系统振荡、储能系统过充和过放的问题。采用储能变流器和光伏逆变器并联运行的微电网结构,通过分析微电网各电源出力情况,提出一种在微电网离网时刻,考虑储能系统荷电状态(State of charge,SOC)的变主从协同控制策略,即将主从控制、对等控制、分层控制的优势结合起来,实现储能变流器在二次调压调频的下垂控制和PQ控制间灵活切换,实现微电网的平滑离网,防止储能系统过充和过放。最后搭建仿真模型,对所提方法的有效性进行验证。
