Simulation of ride through capability of adjustable speed drive for type A and type B voltage sags and well using Buck-Boost converter

Abstract

Voltage sags and swell are common in our supply systems. Adjustable Speed Drives are susceptible to voltage sags occurring due to faults in electric power systems. There are different techniques to enhance ride through capability of ASD's during voltage sag and swell conditions. These are aimed at maintaining the DC-link voltage constant by injecting energy from an external source. The Buck-Boost converter maintains the ASD dc bus voltage under sag and swells conditions. In this paper, simulation results are presented for the verification of the proposed Buck-Boost converter topology. Buck-Boost converter provides the ride-through capability during sag and swell.

Dual 3-Phase Bridge Multilevel Inverters for AC Drives with Voltage Sag Ride-through Capability

“…Besides the cost of these storage elements, in some solutions the use of an extra power converter was also proposed, which further increases the system cost. Another solution was presented in [22], which uses a DC-DC buck-boost converter after the diode rectifier. However, this solution requires extra power semiconductors, higher voltage capacitors, and an extra storage element (inductor).…”

“…However, these solutions are costly, have limited lifetimes (DC electrolytic capacitors or batteries), and/or are dependent on the voltage sag level and duration. In [22] another topology is presented to improve the voltage through the AC drive. However, this solution requires an extra DC-DC converter that increases the cost, losses, and complexity of the system.…”