In this paper, we study the containment control problem for nonlinear second-order systems with unknown parameters and multiple stationary/dynamic leaders. The topologies that characterize the interaction among the le...In this paper, we study the containment control problem for nonlinear second-order systems with unknown parameters and multiple stationary/dynamic leaders. The topologies that characterize the interaction among the leaders and the followers are directed graphs. Necessary and sufficient criteria which guarantee the control objectives are established for both stationary leaders(regulation case) and dynamic leaders(dynamic tracking case) based protocols. The final states of all the followers are exclusively determined by the initial values of the leaders and the topology structures. In the regulation case, all the followers converge into the convex hull spanned by the leaders,while in the dynamic tracking case, not only the positions of the followers converge into the convex hull but also the velocities of the followers converge into the velocity convex hull of the leaders.Finally, all the theoretical results are illustrated by numerical simulations.展开更多
A new method is presented in this paper for fitting VFC*ss (voltage to frequency converter) output functions by using high order neural networks. The nonlinear estimation is implemented when the VFC110 is used at a...A new method is presented in this paper for fitting VFC*ss (voltage to frequency converter) output functions by using high order neural networks. The nonlinear estimation is implemented when the VFC110 is used at a full scale output frequency of 4 MHz. Two kinds of on line dynamic calibrating circuits are designed to improve the sampling precision. This method can also be applied to different industrial applications.展开更多
Outer synchronization between two different fractional-order general complex dynamical networks is investigated in this paper. Based on the stability theory of the fractional-order system, the sufficient criteria for ...Outer synchronization between two different fractional-order general complex dynamical networks is investigated in this paper. Based on the stability theory of the fractional-order system, the sufficient criteria for outer synchronization are derived analytically by applying the nonlinear control and the bidirectional coupling methods. The proposed synchronization method is applicable to almost all kinds of coupled fractional-order general complex dynamical networks. Neither a symmetric nor irreducible coupling configuration matrix is required. In addition, no constraint is imposed on the inner-coupling matrix. Numerical examples are also provided to demonstrate the validity of the presented synchronization scheme. Numeric evidence shows that both the feedback strength k and the fractional order a can be chosen appropriately to adjust the synchronization effect effectively.展开更多
This paper presents a new method for finding the natural frequency set of a linear time invariant network. In the paper deriving and proving of a common equation are described. It is for the first time that in the co...This paper presents a new method for finding the natural frequency set of a linear time invariant network. In the paper deriving and proving of a common equation are described. It is for the first time that in the common equation the natural frequencies of an n th order network are correlated with the n port parameters. The equation is simple and dual in form and clear in its physical meaning. The procedure of finding the solution is simplified and standardized, and it will not cause the loss of roots. The common equation would find wide use and be systematized.展开更多
近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系...近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系统的模型;然后,将其接入SNOP的直流侧,形成智能光储软开关(SNOP integrated with energy storage and photovoltaics,PE-SNOP),在此基础上建立柔性有源配电网的潮流调控模型,采用二阶锥规划算法进行求解;最后,利用改进的IEEE 33节点配电网模型对所提优化模型和算法进行了求解与验证,并与SNOP、智能储能开关单独优化的结果进行了对比。结果表明,所提模型有效提升了SNOP的调节能力,能够实现削峰填谷、抵抗随机扰动的作用,可改善系统运行状态,有效提高配电网运行经济性。展开更多
基金supported by the National Natural Science Foundation of China(61203354)
文摘In this paper, we study the containment control problem for nonlinear second-order systems with unknown parameters and multiple stationary/dynamic leaders. The topologies that characterize the interaction among the leaders and the followers are directed graphs. Necessary and sufficient criteria which guarantee the control objectives are established for both stationary leaders(regulation case) and dynamic leaders(dynamic tracking case) based protocols. The final states of all the followers are exclusively determined by the initial values of the leaders and the topology structures. In the regulation case, all the followers converge into the convex hull spanned by the leaders,while in the dynamic tracking case, not only the positions of the followers converge into the convex hull but also the velocities of the followers converge into the velocity convex hull of the leaders.Finally, all the theoretical results are illustrated by numerical simulations.
文摘A new method is presented in this paper for fitting VFC*ss (voltage to frequency converter) output functions by using high order neural networks. The nonlinear estimation is implemented when the VFC110 is used at a full scale output frequency of 4 MHz. Two kinds of on line dynamic calibrating circuits are designed to improve the sampling precision. This method can also be applied to different industrial applications.
基金supported by the National Natural Science Foundation of China (Grant No. 60873133)the National High Technology Research and Development Program of China (Grant No. 2007AA01Z478)
文摘Outer synchronization between two different fractional-order general complex dynamical networks is investigated in this paper. Based on the stability theory of the fractional-order system, the sufficient criteria for outer synchronization are derived analytically by applying the nonlinear control and the bidirectional coupling methods. The proposed synchronization method is applicable to almost all kinds of coupled fractional-order general complex dynamical networks. Neither a symmetric nor irreducible coupling configuration matrix is required. In addition, no constraint is imposed on the inner-coupling matrix. Numerical examples are also provided to demonstrate the validity of the presented synchronization scheme. Numeric evidence shows that both the feedback strength k and the fractional order a can be chosen appropriately to adjust the synchronization effect effectively.
文摘This paper presents a new method for finding the natural frequency set of a linear time invariant network. In the paper deriving and proving of a common equation are described. It is for the first time that in the common equation the natural frequencies of an n th order network are correlated with the n port parameters. The equation is simple and dual in form and clear in its physical meaning. The procedure of finding the solution is simplified and standardized, and it will not cause the loss of roots. The common equation would find wide use and be systematized.
文摘近年来,以现代电力电子装置为基础的智能软开关(soft normally open point,SNOP)逐渐成为配电网重要的一环,为进一步充分发挥SNOP拓扑结构优势,提出在SNOP直流侧接入光储一体化系统对柔性配电网进行潮流优化。首先分析储能系统和光伏系统的模型;然后,将其接入SNOP的直流侧,形成智能光储软开关(SNOP integrated with energy storage and photovoltaics,PE-SNOP),在此基础上建立柔性有源配电网的潮流调控模型,采用二阶锥规划算法进行求解;最后,利用改进的IEEE 33节点配电网模型对所提优化模型和算法进行了求解与验证,并与SNOP、智能储能开关单独优化的结果进行了对比。结果表明,所提模型有效提升了SNOP的调节能力,能够实现削峰填谷、抵抗随机扰动的作用,可改善系统运行状态,有效提高配电网运行经济性。
