Many of the current implementations of exoskeletons for the lower extremities are conceived to either augment the user's load-carrying capabilities or reduce muscle activation during walking. Comparatively little research has been conducted on enabling an exoskeleton to increase the agility of lower-limb movements. One obstacle in this regard is the inertia of the exoskeleton's mechanism, which...

The behavioural repertoire of male flies includes visually guided chasing after moving targets. The visuomotor control system for these pursuits belongs to the fastest found in the animal kingdom. We simulated a virtual fly, to test whether or not experimentally established hypotheses on the underlying control system are sufficient to explain chasing behaviour. Two operating instructions for st...

This paper addresses the problem of dynamic frequency control in a diesel-based mini-grid. It is shown that a virtual synchronous machine (VSM) can support dynamic frequency control by adding virtual inertia and damping to the system. However, it is found that the typical formulation of damping power does not work properly when the grid forming gen-set operates in droop mode because of the unkn...

Many of the current implementations of exoskeletons for the lower extremities are conceived to either augment the user’s load-carrying capabilities or reduce muscle activation during walking. Comparatively little research has been conducted on enabling an exoskeleton to increase the agility of lower-limb movements. One obstacle in this regard is the inertia of the exoskeleton’s mechanism, which...

In grid-forming control, the swing equation of a synchronous machine is emulated by power controller. Thereby, frequency droop, power-oscillation damping, and/or virtual inertia can be obtained. this letter, it shown that phase-locked loop—which normally grid following—can designed so as to, in turn, emulate generic controller, thus, becoming grid-forming.

Abstract Depletion of fossil fuel, global warming, and their environmental pollution clarify the importance renewable energy sources (RESs). However, high penetration RESs decreases power systems inertia, hence, system becomes more sensitive to disturbances. This results in problems with frequency control because it increases rate change may lead load shedding or tripping generating units. pape...

An islanded microgrid (MG) including low-inertia converter-based distributed generations (DGs) is subjected to instability. The virtual inertia concept was proposed alleviate the stability issues by imitating synchronous generators behavior. This paper spotlights on optimization of generator (VSG) parameters and impedances (VI) in MGs using particle swarm (PSO). A small-signal model for MG deve...

Abstract Given the high proportion of wind power frequency/voltage stability problems, system based on synchronized coordinates (DFIG) mathematical model doubly-fed motor, studies a current source containing inertial link type turbine virtual synchronous control strategy, and loop design inner ring. Established in Matlab/Simulink simulation generator, generator realized inertia. Simulation resu...