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The LC hybrid active power filter (LC-HAPF) is able to compensate reactive power and harmonics with operating voltage lower than the grid voltage. The quasi proportional-resonant (PR) controller could reduce the current tracking error by increasing the open loop gain at the selected frequency. Multiple PR controllers have been adopted for improving harmonic compensation in LCL filter coupled grid-connected...
Compliance is an important property in machine, but mechanism to realize compliance is not adequate to the demand. In this paper, the variable stiffness linkage (VSL) was designed to achieve safety assurance, stability improvement and energy conservation in robots and mechanical applications. Stiffness change could be realized by changing the position of the slider on each leaf spring. In order to...
The geomagnetic storms influence the operation of power systems, and do harm to the electrical equipment, and even lead to large-scale power outages. The purpose of this paper is to analysis the effect of geomagnetic storms on parallel transmission lines. In this paper, the coupled interference relationship of magnetic storms and transmission lines are analyzed. And the interference of magnetic storms...
This paper provides a classification of in-pipe robots or robotic mechanisms in literature with the help of axiomatic design theory (ADT). The existing classification of these designs focuses on either their mobility or contact of the robot with the pipe inner surface. Such classification fails to provide a framework to guide the design of such robots. In this paper, we first propose a new approach...
The insulation defects in a cable joint may be formed in its manufacturing and long-term operation processes, and will cause the power system faults due to electrical or thermal breakdown of cable insulation. In this work, based on the electromagnetic-thermal coupled theory, the 3-D models of a 64/110 kV power cable joint with and without the presence of insulation defects are set up, then the electromagnetic...
To study firing signal propagation of hierarchical neuronal network, this paper investigates a neuronal network with FHN (FitzHugh-Nagumo) nodes. Average firing rate is applied to show the performance of the propagation. Signal raster plots in different layer demonstrate intuitively propagation process. Moreover, effects of the connection probability, the random connection number, the number of branches...
In order to solve the common problems of dual-motor asynchrony in dual-drive synchronization control system, and achieve precise synchronization control of dual-screw drive system, an improved cross coupling control algorithm based on disturbance compensation is proposed in this paper and the corresponding mathematical model is established. First, setting several groups' parameters of the disturbance...
This work handles the design of a stabilization control for a high-speed craft in order to improve comfort and security in maritime transport. The goal is to damp the coupled dynamics of heave, pitch and roll by using active stabilization surfaces such as flaps, T-foil and fins. The methodology used is based on the Quantitative Feedback Theory (QFT) robust technique. Two approaches depending on the...
As the power source of hydraulic system, hydraulic pump determines the reliability and life of the electro-hydraulic dynamic control and actuation system in an aircraft. For hydraulic pump, higher rotation speed and larger load pressure means higher power density, however, as well as stronger multi-field coupling effect and larger stress deformation and thermal deformation of the key rotating and...
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