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http://dx.doi.org/10.5762/KAIS.2020.21.11.746

A study on the voltage rise of the inverter output terminal according to the low voltage Grid connection of solar power generation  

Cho, Kang-yeon (Korea Electrical Safety Corporation)
Eo, Ik-soo (Dept. of Electrical Engineering, Honam University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.11, 2020 , pp. 746-752 More about this Journal
Abstract
As environmental issues have been taken seriously, the number of solar power generation facilities has rapidly increased in Korea. The voltage at the output stage of an inverter increases in a system that connects a small-capacity photovoltaic power generation to low-voltage power distribution. This degrades the quality of the low-voltage distribution system and adversely affects the load facility. In this study, a solution was obtained to increase the voltage at the output stage of the solar inverter according to the connection of the low-voltage distribution system. The voltage can be controlled by using reactive power factor control inverters. If the secondary tap is adjusted, the voltage can be adjusted to about 15 V, but there is a problem in that the tap is not adjusted unless the KEPCO distribution regulation voltage is out of the range of 220±13V. If the number of inverters is limited, the inverter can be started within the inverter overvoltage range. If it is connected to three phases, the voltage is distributed. The results indicated that power factor control and active voltage control inverters were easy to apply in the field.
Keywords
Photovoltaic Power Generation; Low-voltage Distribution System; Overvoltage; Active Voltage Control; Power Factor Control;
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