A streamlined start-up procedure for grid-connected photovoltaic system with DC power optimizers

Trung-Hieu Uong, Leonardo Callegaro

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

1 Citation (Scopus)

Abstract

In traditional grid-tied photovoltaic (PV) systems, the power output drops significantly when partial shadowing occurs between different PV modules in a string, as the PV string current is limited to the value delivered by the weakest module. This issue is mitigated by coupling a dc-dc converters (micro-converter) to every PV module, each being operated at the maximum power point (MPP). In this scenario, without communication links between the distributed micro-converter and the grid-tied inverter, a system start-up procedure must be carefully designed to avoid over-voltages occurring at the micro-converters/inverter interface, eventually leading to system breakdown or failure. In this paper, the control algorithm of each converter is enhanced to provide a seamless start-up operation, so that PV units can safely start transferring power to the inverter and the grid. Improving from previous works, the proposed control technique is simple and removes the need for current sensors at the output of each micro-converter and at the inverter dc-link, providing an economical advantage. Simulation results demonstrate the successful system start-up behavior, whilst confirming the benefits of the proposed control technique.

Original languageEnglish
Title of host publication2022 Second International Conference on Sustainable Mobility Applications, Renewables and Technology (SMART)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Electronic)9781665471466, 9781665471459
ISBN (Print)9781665471473
DOIs
Publication statusPublished - 2022
Event2nd International Conference on Sustainable Mobility Applications, Renewables and Technology, SMART 2022 - Cassino, Italy
Duration: 23 Nov 202225 Nov 2022

Conference

Conference2nd International Conference on Sustainable Mobility Applications, Renewables and Technology, SMART 2022
Country/TerritoryItaly
CityCassino
Period23/11/2225/11/22

Keywords

  • solar power-optimizers
  • distributed photovoltaic power system
  • dc-dc converter
  • grid-tied inverter

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