PHOTOVOLTAIC SYSTEM INTERFACE WITH A DC-DC BOOST CONVERTER IN D-STATCOM FOR POWER QUALITY IMPROVEMENT

Abstract

In this paper, a three-phase three-wire Distribution STATic COMpensator (DSTATCOM) which is fed by Photovoltaic (PV) array or battery operated DC-DC boost converter is proposed for power quality improvement in the distribution system. The proposed DSTATCOM consists of a three-leg Voltage Source Converter (VSC) with a DC bus capacitor. The PV array or battery operated boost converter is proposed to maintain the DC link voltage of the DC bus capacitor for continuous compensation for the load. The control of DSTATCOM is achieved by using IcosΦ controlling algorithm which is used to generate the reference currents. The switching of VSC will occur by comparing the source current with the reference current using Hysteresis based Pulse Width Modulation (PWM) current controller. The performance of the DSTATCOM is validated using MATLAB software with its simulink and Power System Blockset (PSB) toolboxes.

Keywords

• Distribution Static Compensator, Photo Voltaic Array, Boost Converter, Voltage Source Converter, IcosΦ Controlling Algorithm.

References

1. source currents ( ) are compared with the source currents ( ) in hysteresis based PWM current controller for generating gate signals for IGBT switches of VSC based DSTATCOM. Simulation Results and Discussion The analysis of PV or battery interfaced to boost converter operated DSTATCOM for a three-phase threewire system has been done using MATLAB software using SIMULINK and Power System Blockset (PSB) toolboxes and hence the performance has been shown. The source current without compensation and injected current waveform is shown in Figure 5. The source current waveform is shown in Figure 6. Figure 5. Source current without compensation and Injected current waveform with IcosΦ controlling algorithm Figure 6. Source current waveform with IcosΦ controlling algorithm Figure 7. Phase A Current harmonics and its THD waveform for without and with controlling algorithm Figure 8. Active Power Waveforms Figure 9. Reactive Power Waveforms The Phase A current harmonics and its THD waveform for without and with IcosΦ controller is shown in Figure 7. The active power waveform for IcosΦ controller is shown in Figure 8. The reactive power waveform for IcosΦ controller is shown in Figure 9. The DC bus capacitor voltage waveform is shown in Figure Figure 10. DC bus capacitor voltage Table Comparison of THD values of DSTATCOM before and after compensation Phases Before compensation After compensation Phase A 98 25 Phase B 98 21 Phase C 98 25 Conclusion The simulation of the Photovoltaic (PV) array or battery operated DC-DC boost converter fed three-leg VSC based DSTATCOM has been carried out for reactive power compensation, source harmonic reduction and load current compensation in the distribution system. The DSTATCOM was controlled by IcosΦ algorithm. The boost converter is used to step up the voltage so as to match the dc link voltage of the three-leg VSC based DSTATCOM for continuous compensation. The comparison of THD values of DSTATCOM before and after compensation is shown in Table 2. The THD value is below the permissible limit of 5% (IEEE-519-1992).
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23. M. G. Nair and G. Bhuvaneswari, “A novel shunt active filter algorithm: simulation and analog circuit-based implementation”, International Journal of Energy Technology and Policy, vol. 4, pp. 118-125, 2006. V. Kamatchi Kannan received the B.E. and M.E degrees, from Bharathiyar Univ. and Anna Univ. in 2002 and 2007 respectively. After working as a Lecturer (from 2007) in the Dept. of Electrical and Electronics Engineering in K.S.R. College of Engineering, Tiruchengode, India - affiliated to Anna Univ. and he has been working as a Sr. Assistant Professor in the Dept. of
24. Electrical and Electronics Engineering at K.S.R. College of Engineering, Tiruchengode, India - affiliated to Anna Univ. since July 2010. His area of interest includes photovoltaic array, Converters and FACTS Controllers. He is a member of ISTE and IEEE. Dr. N. Rengarajan received the B.Sc., B.Tech., M.E. and Ph.D. degrees, from Madras University, Anna University Bharathidhasan University and Bharathidhasan University in 1980, 1983, 1993 and 2004 respectively. After working as a Lecturer (from 1988) in the Dept. of Electronics and Communication Engineering in Mookambigai College of Engineering and as an Sr.Lecturer (from 1991) in the Dept. of Electrical and Electronics Engineering in National
25. Institute of Technology, Trichy and in Nizwa College of Technology, Sultanate of Oman and as a Professor and Principal (from 2005) at Vivekanandha Institute of Engineering and Technology for women and at Sethu Insttiute of Technolgy. He has been working as a Principal at K.S.R. College of
26. Engineering, Anna University since 2008. His research interest includes Power System and Control and Soft Computing Techniques. He is a member of ISTE and IEEE.