Grid Integration of Single-Stage SPV-STATCOM System Using Symmetric Cascaded Five-Level VSC

  • Maulik Kandpal
  • Ikhlaq HussainEmail author
  • Bhim Singh
Original Contribution


This work proposes a dual-function single-stage solar photovoltaic (SPV) grid-tied system with STATCOM (static compensator) capabilities using a three-phase five-level cascaded VSC (voltage source converter) operating at low switching frequency with low total harmonic distortion (THD) and low switching losses. The proposed SPV-STATCOM system works in three modes: i.e. Mode-1, in which only an active power is transferred to the grid, Mode-2, in which both active and reactive power are supplied to the grid and Mode-3, in which only reactive power is supplied to the grid, thereby utilizing the full capabilities of the SPV system. An incremental conductance algorithm is used to track power from SPV array which is fed to the grid. To synchronize the VSC to the grid, a decoupled current controller with feed-forward term and double decoupled synchronous reference frame phase-locked loop (DDSRF-PLL) is used. The use of a single-stage five-level cascaded VSC offers the advantages of low switching losses and the operation at high power and high voltage which results in an improvement in quality of power of the system. The simulated results demonstrate the system design and control scheme under varying conditions.


SPV-STATCOM DDSRF Cascaded H-bridge VSC Incremental conductance-based MPPT Power quality 



Funding was provided by the Department of Science and Technology, Government of India (Grant No. RP02583).


  1. 1.
    S. Kouro, J.I. Leon, D. Vinnikov, L.G. Franquelo, Grid-connected photovoltaic systems: an overview of recent research and emerging PV converter technology. IEEE Ind. Electron. Mag. 9(1), 47–61 (2015)CrossRefGoogle Scholar
  2. 2.
    A. Honrubia-Escribano, T. Garcia-Sanchez, E. Gomez-Lazaro, E. Muljadi, A. Molina-Garcia, Power quality surveys of photovoltaic power plants: characterisation and analysis of grid-code requirements. IET Renew. Power Gener. 9(5), 466–473 (2015)CrossRefGoogle Scholar
  3. 3.
    E. Romero-Cadaval, B. Francois, M. Malinowski, Q.-C. Zhong, Qing-Chang Zhong, Grid-connected photovoltaic plants: an alternative energy source, replacing conventional sources. IEEE Ind. Electron. Mag. 9(1), 18–32 (2015)CrossRefGoogle Scholar
  4. 4.
    R.K. Varma, S.A. Rahman, T. Vanderheide, New cntrol of PV solar farm as STATCOM (PV-STATCOM) for increasing grid power transmission limits during night and day. IEEE Trans. Power Deliv. 30(2), 755–763 (2015)CrossRefGoogle Scholar
  5. 5.
    Xiao Liu, Aaron M. Cramer, Yuan Liao, Reactive power control methods for photovoltaic inverters to mitigate short-term voltage magnitude fluctuations. Electr. Power Syst. Res. 127, 213–220 (2015)CrossRefGoogle Scholar
  6. 6.
    C. Jain, B. Singh, S. Goel, ILST control algorithm of single-stage dual purpose grid connected solar PV system. IEEE Trans. Power Electron. 29(10), 5347–5357 (2014)CrossRefGoogle Scholar
  7. 7.
    C. Jain, B. Singh, Single-phase single-stage multifunctional grid interfaced solar photo-voltaic system under abnormal grid conditions. IET Gener. Transm. Distrib. 9(10), 886–894 (2015)CrossRefGoogle Scholar
  8. 8.
    B. Singh, I. Hussain, Grid integration of single stage solar PV power generating system using 12-pulse VSC, in 6th IEEE India Int. Conf. Power Electronics (IICPE), kurukshetra, 8–10 Dec. 2014, pp. 1–6Google Scholar
  9. 9.
    C. Jain, B. Singh, A single-phase two-stage grid interfaced SPV system with adjustable DC link voltage for VSC under non ideal grid conditions, in IEEE Int. Conf. Power Electronics, Drives and Energy Systems (PEDES), Bombay, 16–19 Dec. 2014, pp. 1–6Google Scholar
  10. 10.
    B. Singh, S. Dwivedi, I. Hussain, A. K. Verma, Grid integration of solar PV power generating system using QPLL based control algorithm, in IEEE Power India Int. Conf. (PIICON), New Delhi, India, 5–7 Dec. 2014, pp. 1–6Google Scholar
  11. 11.
    S. Kumar, A. K. Verma, I. Hussain, B. Singh, Performance of grid interfaced solar PV system under variable solar intensity, in 6th India Int. Conf. Power Electronics (IICPE), Kurukshetra, 8–10 Dec. 2014, pp. 1–6Google Scholar
  12. 12.
    S. Deo, C. Jain, B. Singh, A PLL-less scheme for single-phase grid interfaced load compensating solar PV generation system. IEEE Trans. Ind. Inform. 11(3), 692–699 (2015)CrossRefGoogle Scholar
  13. 13.
    C. Zhang, S. Du, Q. Chen, A novel scheme suitable for high-voltage and large-capacity photovoltaic power stations. IEEE Trans. Ind. Electron. 60(9), 3775–3783 (2013)CrossRefGoogle Scholar
  14. 14.
    I. Hussain, B. Singh, Grid integration of large capacity solar PV plant using multipulse VSC with robust PLL based control, in IEEE Power India Int. Conf. (PIICON), New Delhi, India, 5–7 Dec. 2014, pp. 1–6Google Scholar
  15. 15.
    I. Hussain, B. Singh, Investigations on solar PV grid interfaced power generating system using two-level twelve-pulse double bridge converter, in 9th IEEE Int. Conf. Industrial and Information Systems (ICIIS), Gwalior, 15–17 Dec. 2014, pp. 1–6Google Scholar
  16. 16.
    W. Zhao, G. Konstantinou, M. Ciobotaru, V.G. Agelidis, Cascaded H-bridge multilevel converter for large-scale PV grid-integration with isolated DC-DC stage, in 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 25–28 June 2012, pp. 849–856Google Scholar
  17. 17.
    E. Villanueva, P. Correa, J. Rodriguez, M. Pacas, Control of a single-phase cascaded H-bridge multilevel inverter for grid-connected photovoltaic systems. IEEE Trans. Ind. Electron. 56(11), 4399–4406 (2009)CrossRefGoogle Scholar
  18. 18.
    N.A. Rahim, M.F.M. Elias, W.P. Hew, Transistor-clamped H-bridge based cascaded multilevel inverter with new method of capacitor voltage balancing. IEEE Trans. Ind. Electron. 60(8), 2943–2956 (2013)Google Scholar
  19. 19.
    M. Rashid, Power Electronics Circuits, Devices and Applications. 3rd edn. (Pearson Education Pte Ltd., 2004)Google Scholar
  20. 20.
    B. Wu, High-Power Converters and AC Drives (Wiley, 2006)Google Scholar
  21. 21.
    B. Xiao, L. Hang, J. Mei, C. Riley, L.M. Tolbert, B. Ozpineci, Modular cascaded h-bridge multilevel PV inverter with distributed mppt for grid-connected applications. IEEE Trans. Ind. Appl. 51(2), 1722–1731 (2015)CrossRefGoogle Scholar
  22. 22.
    Y. Liu, B. Ge, H. Abu-Rub, Modelling and controller design of quasi-Z-source cascaded multilevel inverter-based three-phase grid-tie photovoltaic power system. IET Renew. Power Gener. 8(8), 925–936 (2014)CrossRefGoogle Scholar
  23. 23.
    A. Alexander, M. Thathan, Modelling and analysis of modular multilevel converter for solar photovoltaic applications to improve power quality. IET Renew. Power Gener. 9(1), 78–88 (2015)CrossRefGoogle Scholar
  24. 24.
    B. Subudhi, R. Pradhan, A comparative study on maximum power point tracking techniques for photovoltaic power systems. IEEE Trans. Sustain Energy 4(1), 89–98 (2013)CrossRefGoogle Scholar
  25. 25.
    R. Teodorescu, M. Liserre, P. Rodríguez, Grid Converters for Photovoltaic and Wind Power Systems. (Wiley, 2011)Google Scholar
  26. 26.
    F. Xiong, W. Yue, L. Ming, W. Ke, L. Wanjun, A novel PLL for grid synchronization of power electronic converters in unbalanced and variable-frequency environment, in 2nd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 16–18 June 2010, pp. 466–471Google Scholar
  27. 27.
    IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, IEEE Std. 519-1992, 1993Google Scholar

Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  1. 1.Department of Electrical EngineeringIndian Institute of Technology DelhiNew DelhiIndia

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