A Cost-Effective Power Ramp-Rate Control Strategy for Single-Phase Two-Stage Grid-Connected Photovoltaic Systems

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Abstract

In the case of a wide-scale adoption of grid-connected Photovoltaic (PV) systems, more fluctuated power will be injected into the grid due to the intermittency of solar PV energy. A sudden change in the PV power can potentially induce grid voltage fluctuations, and thus challenge the stability of the grid. Hence, this sudden active power change resulting in a large power ramp-rate should be avoided in practice. In fact, some grid regulations also released strict rules on active power ramp-rates for PV systems. This paper proposes a cost-effective control strategy to limit the power ramp-rate for two-stage grid-connected PV systems. The main concept of the proposed scheme is to modify the maximum power point tracking algorithm in such a way to regulate the PV power at the left side of the maximum power point curve. As a consequence, the power ramp-rate can be controlled according to the set-point. Experiments conducted on a 3-kW single-phase two-stage grid-connected PV system have verified that the proposed solution can accomplish fast dynamics, high accuracy, and high robustness in the power ramp-rate control for PV systems.
Original languageEnglish
Title of host publicationProceedings of the 8th Annual IEEE Energy Conversion Congress and Exposition (ECCE), 2016
Number of pages7
PublisherIEEE Press
Publication dateSep 2016
ISBN (Electronic)978-1-5090-0737-0
DOIs
Publication statusPublished - Sep 2016
Event 8th Annual IEEE Energy Conversion Congress & Exposition: ECCE 2016 - Milwaukee, WI, United States
Duration: 18 Sep 201622 Sep 2016
http://www.ieee-ecce.org/

Conference

Conference 8th Annual IEEE Energy Conversion Congress & Exposition
CountryUnited States
CityMilwaukee, WI
Period18/09/201622/09/2016
SponsorIEEE, IEEE Industry Applications Society (IAS), IEEE Power Electronics and Industry Applications Societies (PELS)
Internet address

Keywords

  • Active power control
  • Ramp power control
  • Maximum power point tracking
  • Power curtailment
  • PV systems
  • Grid-connected power converters

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