Single-Phase partial power unfolding inverter for photovoltaic string application

H. Renaudineau, F. Flores-Bahamonde, S. Kouro, J. W. Zapata

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)


Partial power converters, also know as fractional or differential power converters among other terminologies, is a very attractive concept that has gained an increasing attention during the last decades. Through a rearrangement of the traditional power conversion structures, the converter only processes a fraction of the total power while the rest is directly transmitted to the load. Consequently, a significant reduction in size and cost of the converter is achieved through the use of low-power ratings devices, allowing also higher efficiencies. Partial power converters have been proposed for various applications, such as photovoltaic (PV) systems. In PV applications single-phase grid-connected PV inverter are composed usually by two-stage power conversion, a full power DC-DC converter and a hard-switched high frequency PWM inverter. Although, different DC-DC partial power converter have been proposed as a first stage, most of the existing solutions deals with constant DC-DC regulation voltage, then the DC-AC grid tied inverter stage still requires to perform all the inversion through hard-switched PWM strategy. In this paper a partial power unfolding dc-dc stage is proposed, which generates a rectified sinusoidal current, leaving only the unfolding duty to the inverter stage. As a result, only one hard-switched PWM partial power stage composes the system, increasing the efficiency. The proposed partial power inverter is applied on a 3.3kW PV string inverter. Simulation results are provide to verify the interest of the proposed partial power DC-AC inverter.

Original languageEnglish
Title of host publicationProceedings of 2021 IEEE 30th International Symposium on Industrial Electronics, ISIE 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728190235
Publication statusPublished - 20 Jun 2021
Event30th IEEE International Symposium on Industrial Electronics, ISIE 2021 - Kyoto, Japan
Duration: 20 Jun 202123 Jun 2021

Publication series

NameIEEE International Symposium on Industrial Electronics


Conference30th IEEE International Symposium on Industrial Electronics, ISIE 2021


  • Fractional power conversion
  • Partial power converter
  • Photovoltaic
  • String inverter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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