Dynamic voltage restorer with battery energy storage for voltage dip mitigation

Abstract

The `dynamic voltage restorer' (DVR) consists of a DC voltage link connected to a three-phase inverter. It responds rapidly to voltage sags. The load voltage is negligibly effected by voltage sags of 0.4 pu. The resulting transients are small and quickly fall. The damping in the circuit is less for higher power DVR's. Slightly higher transient oscillations are expected. The important systems issues surrounding the circuit of a Dynamic Voltage Restorer using battery energy storage for voltage dip mitigation are discussed. The connection arrangement, filtering, system control and effect of real power storage are examined.