He Cai

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In this paper, we consider the leader-following consensus problem for multiple uncertain rigid spacecraft systems with the attitude being represented by unit quaternion. Existing results on this problem rely on the assumption that all parameters of the rigid spacecraft system are known exactly. By employing a nonlinear distributed observer for the leader(More)
The leader-following consensus problem of multiple uncertain Euler-Lagrange systems under switching network topology was studied using the distributed observer approach in one of our recent papers. However, the distributed observer in that paper assumed that all the followers knew the system matrix of the leader system. In this paper, we first propose a(More)
AIM To investigate the diagnostic performance of liver stiffness measurement (LSM) by elastography point quantification (ElastPQ) in animal models and determine the longitudinal changes in liver stiffness by ElastPQ after splenectomy at different stages of fibrosis. METHODS Liver stiffness was measured in sixty-eight rabbits with CCl4-induced liver(More)
In this paper, a novel consensus-based distributed nonlinear hierarchical control approach is proposed for frequency and voltage regulation of an islanded AC microgrid under switching communication network. It is proved that the proposed control approach is robust against unreliable communication links as long as the switching graph associated with the(More)
For the battery energy storage system (BESS) consisting of multiple battery packages, package-level state-of-charge (SOC) balancing can provide safety redundancy in protecting battery packages from overcharging or overdischarging, and maintain the maximum power capacity of the overall BESS. In this paper, a distributed control scheme is proposed for(More)