Journal
ENERGIES
Volume 15, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/en15176473
Keywords
reverse power flow; on-load tap changer; photovoltaic generation; distribution system
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2022R1G1A1013373]
- National Research Foundation of Korea [2022R1G1A1013373] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The increasing use of photovoltaics in distribution systems has led to the need for technological changes. Researchers have proposed a method for operating load switches using measured voltage and addressing the feeder with the largest voltage problem. Case studies have shown that this method effectively solves the voltage problem and increases hosting capacity.
The increasing use of photovoltaics (PVs) in distribution systems owing to the low-carbon policy has given rise to the need for various technological changes. In particular, the operation of on-load tap changers (OLTCs) has attracted attention. In traditional distribution systems, the OLTC operates via a line-drop compensator (LDC), which focuses on the load to solve the low-voltage problem; however, the problem of over-voltage caused by PVs persists. Currently, a method for operating an OLTC using the measured voltage is being researched; however, solving the voltage problem for several feeders connected to a main transformer (MT) is not viable. Therefore, this study proposes an OLTC operation method to address the feeder with the largest voltage problem depending on the direction of power flow. The proposed method selects a point where the OLTC operates using the difference between the measured and reference voltages. Setting the reference voltage can solve the problem that occurs due to the direction of power flow. Finally, the effectiveness of the proposed method is verified via case studies. Based on the results, we can conclude that the proposed method effectively solves the voltage problem, and an increase in hosting capacity can be expected.
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