Effect of PV-inverter's reactive power injection and location on low-voltage distribution power systems

Name: Mongkol Danbumrungtrakul

Organization : Rajamangala University of Technology Isan Nakhonratchasima. Faculty of Engineering and Technology

Email : mongkol.da@rmuti.ac.th

Name: Thanakrit Sriwisutthichai

Organization : Rajamangala University of Technology Isan Nakhonratchasima. Faculty of Engineering and Technology

Email : golf-pt1955@hotmail.com

Name: Phinit Srithorn

Organization : Rajamangala University of Technology Isan Nakhonratchasima. Faculty of Engineering and Technology

Email : phinit.sr@rmuti.ac.th

keyword: Inverters (Electricity)

LCSH: Photovoltaic power systems

; Power system analysis

LCSH: Electric power distribution

LCSH: Reactive power (Electrical engineering)

Abstract: This paper presents the effects of PV gridconnected inverter installation in low-voltage distribution power systems; its reactive power and locations were considered. The objective is to realise the system power losses, transformer loadings, and voltage profile in order to prepare for the penetration of PV grid-connected inverter. A computer program has been used for analyzing when PV system located near transformer, at the middle, and at the far end of feeder lines. The PV grid-connected inverters were rated from 0 to 100% of the overall loads, and can inject both real and reactive power relating to its power factor varying from 0.5 to unity. Results show that the right sized PV grid-connected inverters can help reducing the overall loss, and location near transformer is more suitable for high power PV systems than other locations; less drawbacks compared to other locations far away from transformer. It can be seen the reactive power injected from 0.8 power-factor PV inverters is the best for reducing power losses and sharing transformer’s burden; results also signify that over-injected reactive power is a direct cause of over-voltage problem, especially at the far end of feeder lines. This summaries that bulk PV grid-connected inverters installation should be located near transformer, in order to prevent problem due to the excessive powers in the systems

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2022

Modified: 2025-08-22

Issued: 2025-08-22

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BibliograpyCitation : In Electrical Engineering Academic Association (Thailand) and Rajamangala University of Technology Isan Khon Kaen Campus. Faculty of Engineering. The 2022 International Electrical Engineering Congress (iEECON 2022) (P01860). Khon Kaen : Rajamangala University of Technology Isan, 2022

eng

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