A Hybrid Power Control Concept for PV Inverters with Reduced Thermal Loading

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Abstract

This letter proposes a hybrid power control concept for grid-connected Photovoltaic (PV) inverters. The control strategy is based on either a Maximum Power Point Tracking (MPPT) control or a Constant Power Generation (CPG) control depending on the instantaneous available power from the PV panels. The essence of the proposed concept lies in the selection of an appropriate power limit for the CPG control to achieve an improved thermal performance and an increased utilization factor of PV inverters,and thus to cater for a higher penetration level of PV systems with intermittent nature. A case study on a single-phase PV inverter under yearly operation is presented with analyses of the thermal loading, lifetime, and annual energy yield. It has revealed the trade-off factors to select the power limit and also verified the feasibility and the effectiveness of the proposed control concept.
Original languageEnglish
JournalIEEE Transactions on Power Electronics
Volume29
Issue number12
Pages (from-to)6271-6275
Number of pages5
ISSN0885-8993
DOIs
Publication statusPublished - 2014

Keywords

  • Photovoltaic inverters
  • Constant power generation
  • Maximum power point tracking
  • Efficiency
  • Thermal loading
  • Reliability

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