DC-AC inverters for static condenser and dynamic voltage restorer applications

There has been significant interest in general classes of power electronic-based active power conditioners such as static condensers and dynamic voltage restorers. These systems are discussed in this paper with a focus on the inverter output stage. The inverters considered include conventional six- and twelve-pulse square wave, pulse-width modulated, and multi-level inverters. Current- and voltage-controlled inverters are considered where appropriate. Each of these inverter topologies has been successfully applied to a number of applications such as adjustable-speed motor drives and static VAr compensators but only limited information is available concerning the use of various topologies with active power conditioning equipment. This paper is intended to assimilate the information that is available in a convenient manner so as to provide the basis for continued research in this area.