NDLI: Enhancing Microinverter Energy Capture With Submodule Differential Power Processing

Content Provider	IEEE Xplore Digital Library
Author	Shibin Qin Barth, C.B. Pilawa-Podgurski, R.C.N.
Copyright Year	1986
Abstract	Differential power processing (DPP) is a power electronics system architecture that configures dc-dc converters in parallel with the PV string to improve its power yield. The parallel nature of the DPP architecture brings a number of benefits, such as low converter power rating and low power losses, all of which make DPP especially suitable for submodule-level maximum power point tracking (MPPT). Meanwhile, microinverters typically perform only module-level MPPT and do not address power losses due to uncompensated submodule mismatch. In this paper, we introduce DPP converters into a microinverter system to improve its energy capture by recovering power losses due to submodule mismatch. The control method to interface DPP converters with a microinverter for submodule MPPT is presented and the tradeoff between tracking accuracy and control overhead is analyzed. A small-footprint DPP converter is designed. A digitally assisted windowed sensing technique is also implemented to address the challenge of precise current sensing. Altogether, the proposed solution seamlessly integrates DPP into the existing microinverter design. To demonstrate the effectiveness of the proposed solution, a hardware prototype has been built and tested with an off-the-shelf commercial microinverter. The improvement in energy capture with DPP converters has been experimentally verified.
Sponsorship	IEEE Power Electronics Society
Starting Page	3575
Ending Page	3585
Page Count	11
File Size	1527619
File Format	PDF
ISSN	08858993
Volume Number	31
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage control Inverters Energy capture Hardware Maximum power point trackers Algorithm design and analysis Sensors power converters Differential power processing maximum power point trackers micro-inverter photovoltaic power systems
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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