Abstract

Reactive power compensation plays a key role in reducing distribution losses by improving power factor. A three phase three wire DSTATCOM consisting of a five level H-bridge Voltage Source Converter (VSC) is proposed for improving power factor in the distribution system at the Point of Common Coupling (PCC) when the load is continuously changing. The sliding mode control algorithm is used for reactive power compensation and achieve unity power factor. To accomplish this DSTATCOM is controlled to supply or absorb reactive power at PCC. Sinusoidal PWM method is used for obtaining the switching pulses for the cascaded H-bridge converter. The performance of the DSTATCOM controlled distribution system is validated by simulations using MATLAB/Simulink software and Power System block set toolboxes.

Keywords:

Multi level inverter, power quality, power factor, reactive power compensation, sine PWM, voltage source converter,

References

1. Akagi, H., E.H. Watanabe and M. Aredes, 2007. Instantaneous Power Theory and Applications to Power Conditioning. John Wiley and Sons, New Jersey.
   CrossRef    
2. Chen, B. and Y.A. Hsu, 2008. Minimal harmonic controller for a STATCOM. IEEE T. Ind. Electron., 55(2): 655-664.
   CrossRef    
3. Ghosh, A. and G. Ledwich, 2003. Load compensating DSTATCOM in weak AC systems. IEEE T. Power Deliver., 18(4): 1302-1309.
   CrossRef    
4. Hung-Chi, T. and C. Chia-Chi, 2006. Nonlinear STATCOM controller using passivity-based sliding mode control. Proceeding of the Asia Pacific Conference on Circuits and Systems, pp: 1996-1999.
   
5. Hurng-Liahng, J., W. Kuen-Der, W. Jinn-Chang and C. Wen-Jung, 2008. A three-phase four-wire power filter comprising a three-phase three-wire active power filter and a zig-zag transformer. IEEE T. Power Electr., 23(1): 252-259.
   CrossRef    
6. IEEE Std. 519, 1993. 519-1992-IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems. pp: 1-112. DOI: 10.1109/IEEESTD.1993.114370.
   CrossRef    
7. Ledwich, A. and A. Ghosh, 2002. A flexible DSTATCOM operating in voltage or current control mode. IEE Proc-C, 149(2): 215-224.
   CrossRef    
8. Lin, B.R. and Y.A. Ou, 2004. Active power filter based on three-phase two-leg switch-clamped inverter. Electr. Pow. Syst. Res., 72(1): 63-72.
   CrossRef    
9. Montero, M.I.M., E.R. Cadaval and F.B. Gonzalez, 2007. Comparison of control strategies for shunt active power filters in three-phase four-wire systems. IEEE T. Power Electr., 22(1): 229-236.
   CrossRef    
10. Mingchao, X. and M. Yanhui, 2013. Integral sliding mode control strategy of D-STATCOM for unbalanced load compensation under various disturbances. Math. Probl. Eng., 2013: 1-14.
    
11. Muni, B.P., S.E. Rao, J.V.R. Vithal, S.N. Saxena, S. Lakshminarayana, R.L. Das, G. Lal and M. Arunachalam, 2003. Development of ± 500 kVAR DSTATCOM for distribution utility and industrial applications. Proceeding of the Conference on Convergent Technologies for the Asia-Pacific Region (TENCON-03), 1: 278-282.
    CrossRef    
12. Singh, B. and J. Solanki, 2009. An implementation of an adaptive control algorithm for a three-phase shunt active filter. IEEE T. Ind. Electron., 56(5): 2811-2820.
    CrossRef    
13. Singh, B.N., A. Chandra and B. Singh, 1999. Performance of sliding mode and fuzzy controllers for a static synchronous series compensator. IEE Proc-C, 146(2): 200-206.
    CrossRef    
14. Singh, B.N., B. Singh, A. Chandra and K. Al-Haddad, 2000. Digital implementation of an advanced static compensator for voltage profile improvement, power-factor correction and balancing of unbalanced reactive loads. Electr. Pow. Syst. Res., 54(2): 101-111.
    CrossRef    

Competing interests

The authors have no competing interests.

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