Voltage control with on-load tap changers in medium voltage feeders in presence of distributed generation
Artikel i vetenskaplig tidskrift, 2007

This paper discusses voltage regulation on medium-voltage feeders with distributed generation (DG) using on-load tap changer (LTC) and line drop compensation (LDC). The analysis shows that LTC is robust against DG, whereas DG can affect the effectiveness of the voltage regulation provided by LDC. However, with proper coordination between DG and LDC, it is possible to ensure voltage regulation without unnecessarily restricting the integration of DG. It is shown that, while lowering the LTC setting can increase the DG integration limit, even higher increase can be obtained by activating the LDC feature, which is present in most LTCs, but often not used. LDC regulation is also compared with other alternatives such as using a DG unit with voltage control capability and installing a line voltage regulator.

Voltage Regulation

Voltage Control.

Line Drop Compensation

On Load Tap Changer

Distributed Generation


Ferry Viawan

Chalmers, Energi och miljö, Elkraftteknik

Ambra Sannino


Jaap E Daalder

Chalmers, Energi och miljö, Elkraftteknik

Electric Power Systems Research

0378-7796 (ISSN)

Vol. 77 10 1314-1322


Annan elektroteknik och elektronik



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