| Title |
A Study on Safety Evaluation Method Considering Fault Cases in ESS |
| Authors |
김윤호(Yun-Ho Kim) ; 김지명(Ji-Myung Kim) ; 김경화(Kyung-Hwa Kim) ; 이예빈(Ye-Bin Lee) ; 노대석(Dae-Seok Rho) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.8.887 |
| Keywords |
Safety Evaluation Method; RPN Method; Energy Storage System; Fault Cases; Fault Characteristics; PSCAD/EMTDC S/W |
| Abstract |
Recently, the installation of energy storage system(ESS) has been increased, in order to overcome the intermittent issues of renewable energy sources and control peak power demand. However, fire accidents in ESS have been continuously occurred, which have greatly affected the ESS market. Accordingly, the Korean government has estimated the causes of the fire accidents to ensure the safety of the ESS, and short circuits and grounded faults are being evaluated as one of the important electrical hazards causing fire accidents.
Therefore, this paper classifies major fault cases such as the short circuits in DC line, battery rack, PCS arm, and grounded fault in AC line based on the fire accident examples in ESS, and presents the safety evaluation method using the RPN(risk priority number) algorithm, which consists of severity, occurrence and detection degrees. Where, the severity degree is comprehensively evaluated by considering the impact of fault cases and the magnitude of the fault current, while the occurrence degree is determined by the exposure condition of fault cases, and the detection degree is estimated with the function and number of installed protection devices. Moreover, this paper performs the modeling of the fault cases in ESS using PSCAD/EMTDC S/W, and presents the fault characteristics depending on the simulation conditions. From the simulation results based on the proposed modeling and safety evaluation method, it is confirmed that the short circuit in DC line has most severe influence on the safety of ESS. |