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Open AccessArticle

Analysis of DC Link Energy Storage for Single-Phase Grid-Connected PV Inverters

1
School of Electrical & Electronic Engineering, Bilecik Seyh Edebali University, Bilecik 11230, Turkey
2
Barbara Hardy Institute, University of South Australia, Adelaide 5095, Australia
3
School of Electrical & Electronic Engineering, University of Adelaide, Adelaide 5005, Australia
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(6), 601; https://doi.org/10.3390/electronics8060601
Received: 16 April 2019 / Revised: 23 May 2019 / Accepted: 24 May 2019 / Published: 29 May 2019
(This article belongs to the Special Issue Grid Connected Photovoltaic Systems)
Single-phase grid-connected photovoltaic (PV) inverters (GCI) are commonly used to feed power back to the utility. However, the inverter output power fluctuates at 100 Hz, which can be seen by the PV panel, and this reduces the PV output power. It is important to determine and analyze the correlation between the array voltage and current ripple and the average output power reduction of PV array. Therefore, this paper investigates the relationships between the oscillations due to single-phase switching and the DC link energy storage for PV GCIs. The balanced ripple definition is introduced and compared with the more common centered ripple definition. Some examples are provided that demonstrate the importance of these results, in the inverter design industry. The analysis presented here incorporates inductor trade-offs, which are verified with experimental results. View Full-Text
Keywords: DC link energy storage; energy efficiency; fluctuations; photovoltaic systems; grid-connected inverter; solar power generation DC link energy storage; energy efficiency; fluctuations; photovoltaic systems; grid-connected inverter; solar power generation
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Ertasgin, G.; Whaley, D.M.; Ertugrul, N.; Soong, W.L. Analysis of DC Link Energy Storage for Single-Phase Grid-Connected PV Inverters. Electronics 2019, 8, 601.

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