Unfunctionality of the instantaneous p-q theory for the control of series active filters

Proliferation of power electronics converters and electronic equipments has dramatically increased electric pollution in electrical distribution power systems. The distorted current draw by these nonlinear loads distorts the supply voltage which may then give rise to harmonic currents at distribution networks, even when at these locations no harmonic generating equipment is present. Furthermore, voltage unbalances, sags, and swells are other power quality issues related to the supply voltage required to be considered for compensation. Consequently, the use of active filters as an affordable solution for power quality is indispensable. These devices increase the efficiency and sustainability of modern power systems and can also help higher penetration of renewable fluctuating power into the network. Subsequently, many theories have been developed to control active filters and then perform compensation of unwanted harmonics, unbalances, sags, and swells. Depending on the issues, the control algorithms employed in series active filters differ. However, the majority of those algorithms deal with proportional integrator PI or PIDs which create a delay in the compensation. To eliminate this delay the latest approaches try to integrate the instantaneous compensation theory in Series active filters. This time domain approach was proposed by Akagi [1] under the name “p-q theory” or “instantaneous power theory”. It is the most widely spread theory for three-phase shunt active filters. This paper discusses the application of the mentioned theory for the control of series active filter and to evaluate its efficiency in a typical network using SimPowerSystems tools of MATLAB‥

[1]  Liu Jinjun,et al.  An instantaneous detecting approach of harmonic voltage for the series active power filter , 1998, POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151).

[2]  A.E. Emanuel,et al.  Summary of IEEE standard 1459: definitions for the measurement of electric power quantities under sinusoidal, nonsinusoidal, balanced, or unbalanced conditions , 2004, IEEE Transactions on Industry Applications.

[3]  Alireza Javadi,et al.  Modeling, Simulation and Real-time Control of Active Filters , 2009 .

[4]  Czarnecki.  Closure on “Instantaneous Reactive Power ${\rm p}$-${\rm q}$ Theory and Power Properties of Three-Phase Systems” , 2008 .

[5]  Ambrish Chandra,et al.  A Novel Structure for Three-Phase Four-Wire Distribution System Utilizing Unified Power Quality Conditioner (UPQC) , 2006 .

[6]  Kamal Al-Haddad,et al.  A New Control Technique for Three-Phase Shunt Hybrid Power Filter , 2009, IEEE Transactions on Industrial Electronics.

[7]  Hirofumi Akagi,et al.  Instantaneous power theory and applications to power conditioning , 2007 .

[8]  Alireza Javadi,et al.  Real-time laboratory implementation results of an active filter , 2010, 2010 9th International Conference on Environment and Electrical Engineering.

[9]  A.M. Stankovic,et al.  A controller to compensate voltage sags, unbalance and harmonic distortion using a series active filter , 2002, Proceedings of the 41st IEEE Conference on Decision and Control, 2002..

[10]  G. Oliver,et al.  A real-time power Hardware-in-the-Loop implementation of an active filter , 2010 .

[11]  Jinjun Liu,et al.  A series active power filter adopting hybrid control approach , 2001 .

[12]  J. Arellano-Padilla,et al.  Transient performance of an active filter under harmonic power variations , 2000, ISIE'2000. Proceedings of the 2000 IEEE International Symposium on Industrial Electronics (Cat. No.00TH8543).

[13]  S. Round,et al.  The transient and steady state performance of a shunt active filter using measured site data , 1998, 8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227).