ABSTRACT:
This paper presents a novel synchronous reference frame
based (SRF) control strategy for shunt hybrid active power filter (SHAPF). The
control strategy includes a direct current control (DCC) and an indirect
current control (ICC) strategy. SHAPF can achieve harmonic compensation and
dynamic reactive power compensation with the proposed controller. In this
proposed method, as distinct from studies in literature, dynamic reactive power
compensation and dc link voltage control is realized with ICC and harmonic
current compensation is realized with DCC. Also, the proposed controller
provides a variable SHAPF dc link voltage which is adjusted according to the
reactive power compensation requirements in order to decrease the switching losses
of converter and achieve power savings. The performance of proposed controller
is verified with experimental results.
KEYWORDS:
1.
Active Power Filter (APF)
2.
Harmonics
3.
Reactive Power Compensation
4.
Direct Current Control
5.
Indirect Current Control
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig. 1. Power Circuit Diagram of SHAPF
(a)
(b)
Fig.2. Reactive Power Trend (a) and
Current Harmonic Spec. (b) of Case I
(a)
(b)
Fig.3. Reactive Power Trend (a) and
Current Harmonic Spec. (b) of Case II
CONCLUSION:
This paper presents a SRF based controller
approach for SHAPF. In proposed control method, DCC strategy is preferred for
harmonic compensation control to maintain superior dynamic and steady state
performance on the compensation of low order harmonics. ICC strategy is used
for the reactive power compensation controller and the dc link voltage
controller to simplify the controller and provide a successful performance without
being affected by dynamic changes in active and reactive current components.
Additionally, the dc link voltage is determined with adaptive to the reactive
power demand of load by the proposed control method. By the help of this
ability, the switching losses of SHAPF is decreased by keeping only required
voltage level on dc link. The proposed control method is applied on the
laboratory prototype of SHAPF. The steady state and dynamic performance of
controller is verified with the experimental results.
REFERENCES:
[1] H. Fujita and H. Akagi, “A practical
approach to harmonic compensation in power systems-series connection of passive
and active filters,” IEEE Trans. Ind. Appl., vol. 27, no. 6, pp.
1020–1025, 1991.
[2] H. Akagi, “Active and hybrid filters
for power conditioning,” ISIE’2000. Proc. 2000 IEEE Int. Symp. Ind.
Electron. (Cat. No.00TH8543), vol. 1, 2000.
[3] H. Fujita, T. Yamasaki, and H.
Akagi, “A hybrid active filter for damping of harmonic resonance in industrial
power systems,” IEEE Trans. Power Electron., vol. 15, no. 2, pp.
215–222, Mar. 2000.
[4] S. Srianthumrong and H. Akagi,
“Medium-voltage transformerless ac/dc power conversion system consisting of a
diode rectifier and a shunt hybrid filter,” IEEE Trans. Ind. Appl., vol.
39, no. 3, pp. 874–882, May 2003.
[5] R. Inzunza and H. Akagi, “A 6.6-kV
Transformerless Shunt Hybrid Active Filter for Installation on a Power
Distribution System,” IEEE Trans. Power Electron., vol. 20, no. 4, pp.
893–900, Jul. 2005.
