his paper presents the analysis of real power system

events recorded at a light industrial site to determine the effect of

a shunt active filter on power quality. The shunt active fdter is

shown to improve power quality by lowering the distodon of the

supply voltage in both the transient and steady state. The shunt

active filter power rating and other design information are also

determined. The performance degradation of the shunt active

fdter when it has a limited rating is then demonstrated. In one

case the voltage distortion is made worse by the active fdter. The

requirements that various transient events, including capacitor

switching and induction motor starts, place on the shunt active

tilter design ace outlined. These requirements are such that the

required switching frequencies exceed those attainable with

ICBTs and transient ratings dominate the active fdter design

constraints. -his　paper presents the　analysis of　real power　system

events recorded at a　light industrial　site　to determine the　effect of

a　shunt　active filter　on power　quality.　The　shunt　active　fdter is

shown to　improve　power　quality　by lowering　the　distodon　of　the

supply　voltage　in both the　transient　and　steady state.　The shunt

active　filter power　rating　and other　design　information　are also

determined.　The　performance　degradation　of　the　shunt　active

fdter when it has a limited　rating　is　then demonstrated.　In one

case the　voltage　distortion is　made worse by the　active fdter.　The

requirements　that　various　transient　events,　including　capacitor

switching　and　induction　motor　starts, place　on　the　shunt　active

tilter design ace　outlined.　These requirements are　such that　the

required　switching　frequencies　exceed　those　attainable with

ICBTs　and　transient　ratings　dominate　the　active　fdter　design

constraints.