This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration s...This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo transportation.The LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive control.The transfer period is divided into several sections to reduce computational burden.The validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer simulation.Numerical results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.展开更多
Considering the stochastic delay problems existing in networked control systems, a new control mode is proposed for networked control systems whose delay is longer than a sampling period. Under the control mode, the m...Considering the stochastic delay problems existing in networked control systems, a new control mode is proposed for networked control systems whose delay is longer than a sampling period. Under the control mode, the mathematical model of such a system is established. A stochastic stabilization condition for the system is given. The maximum delay can be derived from the stabilization condition.展开更多
Integrator forwarding is a recursive nonlinear design technique for the stabilization of feed-forward systems. However, this method still has some limitation. An improved design method is proposed to extend the field ...Integrator forwarding is a recursive nonlinear design technique for the stabilization of feed-forward systems. However, this method still has some limitation. An improved design method is proposed to extend the field of application of this technique. This method is used to design a stabilizer for the inertia wheel pendulum system. Moreover, it is shown that the control Lyapunov function which is obtained from this method can also be used to design a globally asymptotically stabilizing controller with optimality.展开更多
以柔性直流为基础的配电网柔性互联与交直流混合配电网结构将给传统的配电系统运行方式带来巨大变革和挑战。首先简要介绍了一个含大规模新能源接入、集中式储能和负荷,以及融合交、直流微电网的典型多端直流配电网系统,并阐述了基本的...以柔性直流为基础的配电网柔性互联与交直流混合配电网结构将给传统的配电系统运行方式带来巨大变革和挑战。首先简要介绍了一个含大规模新能源接入、集中式储能和负荷,以及融合交、直流微电网的典型多端直流配电网系统,并阐述了基本的分层运行控制框架;然后针对底层稳定控制,分析了直流配电网电压基本控制策略;接着从直流配电网电压波动抑制、直流配电网稳定与阻尼控制,以及直流配电网多运行模式切换控制3个方面综述了提升直流配电网稳定性的关键控制技术。针对直流配电网优化运行关键技术,首先介绍了基于日前调度和实时优化控制的分层优化框架,然后从基于智能软开关(soft open point,SOP)的柔性互联配电网和复杂交直流配电网2类主要场景讨论了直流配电网长时间尺度下的优化调度问题。最后展望了直流配电网运行控制关键技术发展趋势。研究指出:就地控制需要更加柔性化以适应未来交直流配电网灵活功率控制的需求;优化运行控制将深度融合先进信息通讯、量测技术以及大数据、人工智能等技术。论文研究可为直流配电网的运行控制提供参考。展开更多
基金funded by the National Natural Science Foundation of China(12102487)Basic and Applied Basic Research Foundation of Guangdong Province,China(2023A1515012339)+1 种基金Shenzhen Science and Technology Program(ZDSYS20210623091808026)the Discovery Grant(RGPIN-2024-06290)of the Natural Sciences and Engineering Research Council of Canada。
文摘This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo transportation.The LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive control.The transfer period is divided into several sections to reduce computational burden.The validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer simulation.Numerical results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.
基金This project was supported by the National Natural Science Foundation of China (60274014, 60574088).
文摘Considering the stochastic delay problems existing in networked control systems, a new control mode is proposed for networked control systems whose delay is longer than a sampling period. Under the control mode, the mathematical model of such a system is established. A stochastic stabilization condition for the system is given. The maximum delay can be derived from the stabilization condition.
文摘Integrator forwarding is a recursive nonlinear design technique for the stabilization of feed-forward systems. However, this method still has some limitation. An improved design method is proposed to extend the field of application of this technique. This method is used to design a stabilizer for the inertia wheel pendulum system. Moreover, it is shown that the control Lyapunov function which is obtained from this method can also be used to design a globally asymptotically stabilizing controller with optimality.
文摘以柔性直流为基础的配电网柔性互联与交直流混合配电网结构将给传统的配电系统运行方式带来巨大变革和挑战。首先简要介绍了一个含大规模新能源接入、集中式储能和负荷,以及融合交、直流微电网的典型多端直流配电网系统,并阐述了基本的分层运行控制框架;然后针对底层稳定控制,分析了直流配电网电压基本控制策略;接着从直流配电网电压波动抑制、直流配电网稳定与阻尼控制,以及直流配电网多运行模式切换控制3个方面综述了提升直流配电网稳定性的关键控制技术。针对直流配电网优化运行关键技术,首先介绍了基于日前调度和实时优化控制的分层优化框架,然后从基于智能软开关(soft open point,SOP)的柔性互联配电网和复杂交直流配电网2类主要场景讨论了直流配电网长时间尺度下的优化调度问题。最后展望了直流配电网运行控制关键技术发展趋势。研究指出:就地控制需要更加柔性化以适应未来交直流配电网灵活功率控制的需求;优化运行控制将深度融合先进信息通讯、量测技术以及大数据、人工智能等技术。论文研究可为直流配电网的运行控制提供参考。
