S. Saetieo et al., THE DESIGN AND IMPLEMENTATION OF A 3-PHASE ACTIVE POWER FILTER BASED ON SLIDING MODE CONTROL, IEEE transactions on industry applications, 31(5), 1995, pp. 993-1000
This paper presents an active power filter for three-phase systems, Th
e work is motivated by the need for active filtration in a current-sou
rce excitation system for a variable-reluctance generator, The active
filter is comprised of a six-switch three-phase inverter, a de bus cap
acitor, and an isolation transformer. The isolation transformer is req
uired by the application, The leakage inductance associated,vith each
phase of the isolation transformer is used as the series impedance wit
h each phase, by which the inverter is able to actively shape the phas
e currents in order to compensate for the nonlinearities of all loads
within the point of common coupling, The active filter is controlled t
hrough two control loops, The inner current regulation loop uses slidi
ng-mode control by virtue of its ease of implementation, The outer vol
tage loop regulates the average voltage on the de bus capacitor, The o
uter voltage loop is responsible for correctly setting the commanded m
agnitude of the phase currents, This paper presents the analysis, desi
gn, and operation of the active filter, Experimental results are provi
ded for the active filter compensating a phase controlled rectifier wh
ich is drawing 10.4 kW,