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Energies 2016, 9(12), 993; doi:10.3390/en9120993

Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors

1
Department of Electrical Engineering, National Central University, Taoyuan 32001, Taiwan
2
Department of Electrical Engineering, National United University, Miaoli 360, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Ali Bazzi
Received: 11 August 2016 / Revised: 14 November 2016 / Accepted: 21 November 2016 / Published: 25 November 2016
(This article belongs to the Special Issue Power Electronics Optimal Design and Control)
View Full-Text   |   Download PDF [6541 KB, uploaded 25 November 2016]   |  

Abstract

This paper outlines the modeling and controller design of a novel two-stage photovoltaic (PV) micro inverter (MI) that eliminates the need for an electrolytic capacitor (E-cap) and input current sensor. The proposed MI uses an active-clamped current-fed push-pull DC-DC converter, cascaded with a full-bridge inverter. Three strategies are proposed to cope with the inherent limitations of a two-stage PV MI: (i) high-speed DC bus voltage regulation using an integrator to deal with the 2nd harmonic voltage ripples found in single-phase systems; (ii) inclusion of a small film capacitor in the DC bus to achieve ripple-free PV voltage; (iii) improved incremental conductance (INC) maximum power point tracking (MPPT) without the need for current sensing by the PV module. Simulation and experimental results demonstrate the efficacy of the proposed system. View Full-Text
Keywords: ripple voltage cancellation technique; input current; sensorless; incremental conductance maximum power point tracking; active-clamped current-fed push-pull DC-DC converter ripple voltage cancellation technique; input current; sensorless; incremental conductance maximum power point tracking; active-clamped current-fed push-pull DC-DC converter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, F.J.; Chiang, H.C.; Chang, J.K. Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors. Energies 2016, 9, 993.

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