access icon free Plug-in repetitive control of single-phase grid-connected inverter for AC module applications

© The Institution of Engineering and Technology
Received 29/11/2015, Accepted 26/05/2016, Revised 01/05/2016, Published 20/01/2017

This study presents two-stage inverter topology for single-phase grid-connected photovoltaic (PV) applications and its control implementations. The two-stage systems are reliable and work well. Typically, the second stage inverts solar power into AC power, whereas the first stage which is used to increase low PV panel voltage can achieve maximum power point tracking. In this configuration, a boost or a flyback type DC/DC converter topology is usually employed. However, such converters have major drawbacks such as low efficiency and limited voltage gain due to power losses. In the proposed topology, a low-voltage PV panel can be connected to power grid through solar inverter by using high-gain DC/DC converter which has unique features such as galvanic isolation and continuous current for AC module applications. Conventional controller results in poor control performance due to the finite gain at desired frequencies. Hence, a plug-in repetitive controller is proposed to obtain low total harmonic distortions (THDs). The performance of the proposed system is provided for the system which injects the PV panel current in the maximum power point voltage to a grid of 220 V(rms) at a power range of 150–300 W with a unity power factor and a low input current THD.

Inspec keywords: maximum power point trackers; power grids; invertors; solar cell arrays; power conversion harmonics; electric current control; harmonic distortion

Other keywords: control implementations; low total harmonic distortions; plug-in repetitive current controller; solar inverter; low input current THD; flyback type DC-DC converter topology; power grid; single-phase grid-connected PV applications; high-gain DC-DC converter; AC module applications; maximum power point tracking; two-stage inverter topology; single-phase grid-connected inverter; single-phase grid-connected photovoltaic applications; low PV panel voltage enhancement; solar into AC power inversion; power 150 W to 300 W; voltage 220 V

Subjects: Current control; Control of electric power systems; Power electronics, supply and supervisory circuits; Solar cells and arrays

References

    1. 1)
    2. 2)
    3. 3)
    4. 4)
    5. 5)
    6. 6)
    7. 7)
    8. 8)
    9. 9)
    10. 10)
    11. 11)
    12. 12)
    13. 13)
    14. 14)
    15. 15)
    16. 16)
    17. 17)
    18. 18)
    19. 19)
    20. 20)
    21. 21)
    22. 22)
    23. 23)
    24. 24)
    25. 25)
    26. 26)
    27. 27)
    28. 28)
    29. 29)
    30. 30)
    31. 31)
    32. 32)
    33. 33)
    34. 34)
    35. 35)
      • 23. Cha, W.-J, Cho, Y.-W, Kwon, J.-M, et al: ‘Highly efficient microinverter with soft-switching step-up converter and single-switch-modulation inverter’, IEEE Trans. Ind. Electron., 2015, 62, (6), pp. 3516–3523.
    36. 36)
    37. 37)
    38. 38)
    39. 39)
    40. 40)
    41. 41)
    42. 42)
    43. 43)
    44. 44)
    45. 45)
    46. 46)
    47. 47)
    48. 48)
    49. 49)
    50. 50)
    51. 51)
    52. 52)
    53. 53)
    54. 54)
    55. 55)
    56. 56)
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-pel.2015.0950
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