The simulation and analysis of the usage of segment strings and bridge currents in photovoltaic system

Xiaoyang Li, Teruhisa Kumano

Research output: Contribution to journalArticle

Abstract

In photovoltaic (PV) generation system, PV panels can be easily covered by shadows from obstacles around the power station. Usually, these shadows do not cover all of the panels so they are called partial shades. In this situation, PV system loses its power output very large. This paper gives a software and hardware's proposal to increase power output of PV system which is covered by partial shades. Because we used short bridges across neighboring strings and ammeters on them, we can get current data from them. Using these data we can realize some functions like judgment of the partial shades' area, power loss's forecasting, PV panels' online monitoring and so on. In this paper, we will propose an algorithm which can judge the position of partial shade automatically. As the result, it could judge the position of random 1 place partial shade, random 2 places partial shades and random 0, 1, 2 places partial shades. Next, we will propose a new MPPT algorithm which is using the data of bridge currents to make chopper system setting faster and more accurate.

Original languageEnglish
Pages (from-to)549-559
Number of pages11
JournalIEEJ Transactions on Power and Energy
Volume138
Issue number7
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • Bridge currents
  • Judgment of partial shade's position
  • Partial shade countermeasure
  • Photovoltaic system
  • Segment strings

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