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Energies 2017, 10(6), 752; doi:10.3390/en10060752

Control Method Based on Demand Response Needs of Isolated Bus Regulation with Series-Resonant Converters for Residential Photovoltaic Systems

1,†
,
1,†,* , 1,†
,
2,†
,
2,†
and
2,†
1
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
2
Tianjin Research Institute of Electric Science Co., Ltd. (TRIED), Tianjin 300301, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Gabriele Grandi
Received: 24 April 2017 / Revised: 14 May 2017 / Accepted: 19 May 2017 / Published: 27 May 2017
(This article belongs to the Section Electrical Power and Energy System)

Abstract

Considering the effects of isolation and high efficiency, a series-resonant DC-DC converter (L-L-C type, with two inductors and a capacitor) has been introduced into a residential photovoltaic (PV) generation and storage system in this work, and a voltage gain curve upwarp drifting problem was found. In this paper, the reason of upwarp drifting in the voltage gain curve is given, and a new changing topological control method to solve the voltage regulation problem under light load conditions is proposed. Firstly, the ideal and actual first harmonic approximation (FHA) models are given, and this drifting problem is ascribed to the multiple peaks of higher-order resonance between resonant tank and parasitic capacitors. Then the paper presents the pulse-frequency-modulation (PFM) driver signals control method to translate the full-bridge LLC into a half-bridge LLC converter, and with this method the voltage gain could easily be reduced by half. Based on this method, the whole voltage and resonant current sharing control methods in on-line and off-line mode are proposed. The parameters design and optimization methods are also discussed in detail. Finally, a residential PV system platform based on the proposed parallel 7-kW full-bridge LLC converter is built to verify the proposed control method and theoretical analysis. View Full-Text
Keywords: full-bridge series-resonant converter; light load; parasitic parameters; high order resonant; residential photovoltaic system full-bridge series-resonant converter; light load; parasitic parameters; high order resonant; residential photovoltaic system
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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

Zhang, S.-H.; Luo, F.-Z.; Wang, Y.-F.; Liu, J.-H.; He, Y.-P.; Dong, Y. Control Method Based on Demand Response Needs of Isolated Bus Regulation with Series-Resonant Converters for Residential Photovoltaic Systems. Energies 2017, 10, 752.

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