IEEJ Journal of Industry Applications
Online ISSN : 2187-1108
Print ISSN : 2187-1094
ISSN-L : 2187-1094
Paper
Discontinuous Current Mode Control for Minimization of Three-phase Grid-Tied Inverters in Photovoltaic System
Hoai Nam LeJun-ichi Itoh
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2019 Volume 8 Issue 1 Pages 90-97

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Abstract

In this paper, a current control method for discontinuous current mode (DCM) is proposed for a three-phase grid-tied inverter to minimize inductors without worsening current total harmonic distortion (THD). In conventional continuous current mode (CCM) control, current THD increases as an inductor value is reduced because a zero-clamping phenomenon occurs due to dead-time. In the proposed DCM current control, a zero-current interval is intentionally controlled and a dead-time-induced error voltage is simply compensated with conventional dead-time feedforward compensation. The validation of the control method is confirmed by simulations and a 700-W prototype. Compared to conventional CCM current control, the current THD is reduced by 97.6% with the proposed DCM current control, whereas the inductor volume is reduced by 70%. In the experiments, the current THD is maintained below 5% over load range from 0.3p.u. to 1.0p.u. even when the inductance impedance is reduced to 0.5% of the inverter total impedance.

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© 2019 The Institute of Electrical Engineers of Japan
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