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Wednesday 10 February 2016

An Improved SVPWM based Shunt Active Power Filter for Compensation of Power System Harmonics


 ABSTRACT:

Space vector pulse width modulation (SVPWM) has been extensively utilized in the three-phase voltage source inverters (VSI) for the benefit of fixed switching frequency, full utilization of DC bus voltage and superior control. In recent times, SVPWM technique was applied for active power filter (APF) control application, as the APF is nothing but of a current controlled VSI. The conventional SVPWM based APF has high computational burden due to complex trigonometric
calculations and sector identification involved to generate the compensating signal, hence the response time for compensation is slow. In this paper, an improved SVPWM technique based shunt APF is presented based on the effective time concept. The effective time concept eliminates the trigonometric calculations and sector identification, thereby it reduces the computational effort. Simulation results demonstrate the efficacy of the APF with the improved SVPWM based control strategy. The response time for compensation is 0.02sec.

KEYWORDS:
1.      SVPWM
2.       Shunt APF
3.      VSI

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM
            


Figure 1. Configuration of Improved SVPWM based shunt APF

CIRCUIT DIAGRAM:
                       
             
Figure 2. Proposed SVPWM control for APF topology

EXPECTED SIMULATION RESULTS:
                      
            

Figure 3. Simulation results (a) Source voltages, (b) Load currents, (c) Compensated source currents, and (d) Filter currents (APF).
                          
                              
Figure 4.DC Bus voltage of the proposed shunt APF

CONCLUSION:

 In this paper, an improved SVPWM based shunt APF is proposed, which is suitable for digital control realization. This method requires less computation when compared to the conventional SVPWM technique as it eliminates the complex trigonometric calculation and sector identification, The performance of shunt APF with this proposed SVPWM method for harmonic compensation is examined and proved to be worthy where the THD of the source currents was reduced from 24.38% to 4.47% and the response time for harmonic compensation is 0.02 sec.

REFERENCES:

[1] H. Akagi, E. H. Watanabe, and M. Aredes, Instantaneous Power Theory and Applications to Power Conditioning, M. E. El-Hawari, Ed. New York: Wiley, 2007.
[2] Recommended Practice for Harmonic Control in Electric Power Systems, IEEE Std. 519-1992, 1992.
[3] Limits for Harmonic Current Emission, IEC 61000-3-2, 2001.
[4] H. Akagi, “New trends in active filters for power conditioning,” IEEE Trans. Ind. Appl., vol. 32, no. 2, pp. 1312–1332, Nov./Dec. 1996.

[5] F. Z. Peng, “Application issues of active power filters,” IEEE Ind. Appl.Mag., vol. 4, no. 5, pp. 21--30, Sep./Oct. 1998.