Power Quality means to maintain purely sinusoidal current wave form in phase with a purely sinusoidal voltage wave form. Power quality improvement using traditional compensation methods include many disadvantages like electromagnetic interference, possible resonance, fixed compensation, bulkiness etc. So power system and power electronic engineers need to develop adjustable and dynamic solutions using custom power devices. These power conditioning equipments use static power electronic converters to improve the power quality of distribution system customers. The devices include Active Power Filter (APF), dynamic voltage restorer (DVR) and Unified Power Quality Conditioner (UPQC). APF is a compensator used to eliminate the disturbances in current. There are basically two types of APFs: the shunt type and the series type. This paper examines the control of Shunt Active Power Filter (SAPF) from two different aspects: Synchronous Detection Method (SDM) and digital control based on instantaneous power theory (p-q theory). Simulation results using MATLAB SIMULINK demonstrates the application of these methods to the control of APF. Moreover, this work shows that digital control provides better power quality improvement than SDM.
[1]
Mauricio Aredes,et al.
New control algorithms for series and shunt three-phase four-wire active power filters
,
1995
.
[2]
Mauricio Aredes,et al.
New concepts of instantaneous active and reactive powers in electrical systems with generic loads
,
1993
.
[3]
K. P. Basu,et al.
Three-Phase Shunt Active Power Filter
,
2008
.
[4]
J. Nastran,et al.
Active power filter for nonlinear AC loads
,
1994
.
[5]
Júlio S. Martins,et al.
Active filters with control based on the p-q theory
,
2000
.
[6]
Mauricio Aredes,et al.
Shunt active filter for power quality improvement
,
2001
.
[7]
C. Sankaran.
Power Quality
,
2001
.