A Comparative study of control topologies for single-phase UPS inverter system
Uninterruptible Power Supplies (UPS) have several closed loop control topologies for control of Voltage Source Inverter (VSI). The topologies vary mainly due to choice of control/feedback variable. This paper attempts to categorize different control topologies and highlights the similarities/differences between them. Further, an analytical study on the basis of steady-state and transient performance, design complexity and cost is also presented. Respective control strategies under different loading conditions have been simulated in MATLAB environment in Discrete Time Frame (DTF) for comparative analysis.
Abstract The forms of the temperature and downwind spectra are examined in the well-mixed and overlying stable layers of the tropical boundary layer. The data were obtained from the tethered balloon system designed for GATE. In the mixed layer, the spectra exhibit an inertial subrange. Preliminary data indicate that a buoyant subrange obeying a −3 power law exists over a range of wavenumbers in the stable layer.