Abstract
In this paper, we propose a microgrid (MG) implementation method through Medium-Voltage Direct Current (MVDC) connection between Gapado Island and Marado Island in Korea. MVDC is a facility that can be efficiently applied between small power generation complexes. The structure of power generation facilities is mainly supplied by diesel generators, while solar and wind power generators supply additional power. An Energy Storage System (ESS) is also used to reduce the output fluctuations of wind and solar power generation. Since power systems in such areas are low-voltage and low-power distribution systems, problems can arise in terms of power management due to power generators with variable output characteristics such as solar power and wind power generators. In addition, when a major power source such as a diesel generator is dropped, the power system collapses. However, these problems can be solved by interchanging the power between the micro-grids through the connection of MVDCs. With the MVDC connected, we verify the impact of the power system on Marado Island and Gapado Island due to the input and opening of solar, wind and diesel generators. The proposed configuration uses the PSCAD/EMTDC simulation program.
Highlights
Microgrids using renewable energy sources have been actively constructed in island areas where there are no commercial power connections to the rest of the world
In order to solve this problem, this paper proposes a method to stabilize the power system through the complementary operation, in the case of power output problem, in each island, by linking it with the Medium-Voltage Direct Current (MVDC) model of power system of Gapado Island and Marado Island located in the south area of South Korea
When the two diesel generators installed on Gapado Island drop out, the 1 MW Power Conversion System (PCS) with a 2 MWh battery is switched to emergency mode in normal mode by applying the same method as MVDC
Summary
Microgrids using renewable energy sources have been actively constructed in island areas where there are no commercial power connections to the rest of the world. Among the ESS, batteries are being used most often to mitigate the fluctuation of renewable energy sources with the tendency that prices have recently been getting lower. In operating such a power system, it is necessary to find a way to reduce the existing diesel power that is being operated on each island and to use the output of renewable energy source as much as possible.
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