최형석(Hyoung-Seok Choi) ; 정태훈(Tae-Hoon Jeong) ; 태동현(Dong-Hyun Tae) ; 이후동(Hu-Dong Lee) ; 노대석(Dae-Seok Rho)
Recently, installation of renewable energies and ESS(energy storage system) has been increased to solve energy depletion and crisis of climate change. Especially, the importance of ESS is emerging as its multiple functions such as frequency regulation, power quality improvement, demand management, stabilization of renewable energy, and so on. However, the frequency of lightning strike is increasing due to rapid climate change, and then lightning surge is induced through power line, control cables and communication line and finally it leads to malfunction and damage of control power devices in ESS. Therefore, this paper proposes a design method of a 2-port surge protection device to protect the control power supply of ESS from lightning surges.
And also, this paper implements a surge protection device based on the proposed method. In other words, a 2-port surge protection device is designed and implemented based on the concept of LPZ(lightning protection zone) which is defined by the international standards “IEC 62305-3” and “IEC 62305-4,” in order to protect ESS from the LEMP(lightning electromagnetic pulse) through a power line. In addition, from the test results with combination and impulse wave according to “KS C IEC 61643-11,” it is confirmed that the proposed method is useful to keep residual voltage within 1.5[kV] of surge withstanding value.