Technical issues of voltage regulation in distribution system with large reverse power flow from photovoltaic systems and its solutions

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes measurements, causes, and countermeasures of voltage reduction, spread of voltage unbalance, and voltage flicker, which are technical issues of voltage regulation in distribution system in recent years. The voltage measured in the distribution feeder with large reverse power flow from photovoltaic systems is explained by relationship between voltage rise by active power and voltage reduction by reactive power. The spread of voltage unbalance, which is also related to the large reverse power flow, is caused by unbalanced mutual impedance of threephase distribution wires arranged horizontally or vertically. Frequency feedback method with step injection of reactive power, which is one of islanding detections installed into PCS, is attributed to voltage flicker in the distribution system.

Original languageEnglish
Pages (from-to)441-444
Number of pages4
JournalIEEJ Transactions on Power and Energy
Volume140
Issue number6
DOIs
Publication statusPublished - 2020

Keywords

  • Distribution system
  • Photovoltaic system
  • Unbalance voltage
  • Voltage flicker
  • Voltage fluctuation
  • Voltage regulation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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