
Filtering Techniques for Power Quality Improvement 38-11
for high-power nonlinear loads. e other alternative is the use of a UPQC to compensate voltage and
current problem simultaneously. However, the use of UPQC is an expensive solution.
38.5.1 Passive Filters
Passive lters are combinations of inductors, capacitors, and damping resistors connected in series or in
parallel to present the appropriate high or low impedance to the current or voltage harmonics. Various
topologies of passive lter are available and have dierent compensation characteristics and applica-
tions. ey are generally used as shunt passive lters or series passive lters ...