Improved power quality solutions using advanced solid-state switching and static compensation technologies

Abstract

Utility distribution networks, sensitive industrial loads and critical commercial operations all suffer from various types of outages and service interruptions which can cost significant financial loss per incident based on process down-time, lost production, idle work forces and other factors. The types of interruptions which are experienced can generally be classified as power quality related problems caused by voltage sags and swells, lightning strikes and other distribution system related disturbances. In many instances, the use of a solid-state transfer switch (SSTS) and/or a distribution level static compensator (D-STATCOM) can be some of the most cost-effective solutions for these types of power quality problems. The SSTS, which essentially consists of a pair of thyristor switch devices, enables seamless transfer of energy from a primary source to an alternate source in order to avoid service interruption upon a deficiency in power quality. The D-STATCOM, which consists of a thyristor-based voltage source inverter, uses advanced power electronics to provide voltage stabilization, flicker suppression, power factor correction, harmonic control and a host of other power quality solutions for both utility and industrial applications.