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Performance of Four-Leg VSC based DSTATCOM using Single Phase P-Q Theory

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Abstract

This paper presents single-phase P-Q theory for four-leg VSC based distributed static compensator (DSTATCOM) in the distribution system. The proposed DSTATCOM maintains unity power factor at source, zero voltage regulation, eliminates current harmonics, load balancing and neutral current compensation. The advantage of using four-leg VSC based DSTATCOM is to eliminate isolated/non-isolated transformer connection at point of common coupling (PCC) for neutral current compensation. The elimination of transformer connection at PCC with proposed topology will reduce cost of DSTATCOM. The single-phase P-Q theory control algorithm is used to extract fundamental component of active and reactive currents for generation of reference source currents which is based on indirect current control method. The proposed DSTATCOM is modelled and the results are validated with various consumer loads under unity power factor and zero voltage regulation modes in the MATLAB R2013a environment using simpower system toolbox.

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Correspondence to Bangarraju Jampana.

Appendix

Appendix

Three phase supply voltage: 415 V, 50 Hz

Supply impedance: Rs = 0.06Ω, Ls = 4mH

Loads

  1. (i)

    Linear load: RL = 15 Ω and L = 25 mH

  2. (ii)

    Non-linear R–C loads: three single phase diode bridge rectifier with R = 15 Ω and C = 500 µF

  3. (iii)

    Non-linear R–L loads: three single phase diode bridge rectifier with R = 15 Ω and L = 200 mH; ripple filter at PCC: Rf = 5 Ω and Cf = 5 μF

DSTATCOM

  • dc bus capacitor Cdc = 3000μF

  • dc bus voltage PI controller: Kpd = 120, Kid = 700

  • ac bus voltage PI controller: Kpq = 250, Kiq = 1100

  • PWM switching frequency: fs = 10 kHz.

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Jampana, B., Veramalla, R. & Askani, J. Performance of Four-Leg VSC based DSTATCOM using Single Phase P-Q Theory. J. Inst. Eng. India Ser. B 98, 65–76 (2017). https://doi.org/10.1007/s40031-016-0218-8

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  • DOI: https://doi.org/10.1007/s40031-016-0218-8

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