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신재생에너지의 출력제한 개선을 위한 VPL의 경제성평가 모델링
노성은(Seong-Eun Rho),이민행(Min-Haeng Lee),김지명(Ji-Myung Kim),김경화(Kyung-Hwa Kim),김응상(Eung-Sang Kim),노대석(Dae-Seok Rho) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.10
최근, 제주도의 신재생에너지 전원이 제주도 발전용량의 약 20%까지 증가하여, 신재생에너지의 출력제한이 빈번하게 발생하고 있다. 그리고, 신재생에너지를 연계하기 위한 전력설비 인프라의 부족으로 인하여 신재생에너지가 접속대기 중에 있어, 신재생에너지의 접속지연 문제를 해결하기 위한 연구의 필요성이 증가하고 있다. 이러한 문제를 해결하기 위하여, 전력설비 인프라의 증설 및 신설이 요구되지만, 막대한 건설비용과 오랜 건설기간이 소요되므로 어려움을 겪고 있는 실정이다. 따라서, 본 논문에서는 전력설비를 추가로 증설하거나 신설하지 않고, 신재생에너지 전원의 연계지점이나 수용가 말단 등에 ESS를 운용하여, 전력계통을 관리하는 가상적인 전력선로 운용기술인 VPL(virtual power line) 운용모델을 제시하고, 이를 도입하기 위한 타당성을 평가하기 위하여 VPL의 경제성평가 방안을 제시한다. 여기서, 경제성평가 모델링은 크게 비용요소와 편익요소로 구성되며, 비용요소는 설치비용과 운용비용, 편익요소는 신재생에너지의 출력제한 개선과 전력설비 투자지연에 의한 편익으로 구성된다. 이를 바탕으로, 규모(소규모, 중규모, 대규모)별 VPL의 도입 모델에 대하여, 현재가치 환산법을 이용하여 경제성평가를 수행한 결과, VPL의 적정한 용량을 선정하면 기존의 인프라 투자보다 효과적임을 알 수 있다. Recently, the proportion of renewable energy sources in Jeju Island has increased to approximately 20% of the power generation capacity. However, power curtailment of renewable energy sources frequently occurs. Many renewable energy sources are also waiting to be connected due to the lack of power system infrastructure. To solve these problems, an investment in power system infrastructure is required due to the enormous costs and long period of construction. Therefore, this paper presents an operation method for VPL, which is virtual power line operation technology to manage the power system. This is done by operating an ESS installed at the coupling point of a renewable energy source and the last point of the primary feeder without expanding the power system infrastructure. We also propose an economic evaluation method to perform a feasibility study of a VPL. The economic evaluation method was modeled with cost and benefit factors. The cost factors consisted of construction and operation costs. The benefit factors were composed of improvement of pricing of power curtailment and the benefit of deferred investment in power system infrastructure. From the simulation results for VPL models at the small, medium, and large scale, it was confirmed that the proper capacity of a VPL can be more economical than the investment cost of the expansion of power system infrastructure in the conventional method.
운용환경 및 용도를 고려한 ESS의 안전성 평가 방안에 관한 연구
이예빈(Ye-Bin Lee),김지명(Ji-Myung Kim),이민행(Min-Haeng Lee),노성은(Seong-Eun Rho),김세진(Se-Jin Kim),노대석(Dae-Seok Rho) 대한전기학회 2024 전기학회논문지 Vol.73 No.5
Recently, fire accidents in ESS installed for various applications have been occurred constantly and particularly those of long time operated ESS have been increased. Accordingly, researches are actively conducted on risk factor evaluations considering safety standards in ESS, and operation environments and applications of ESS are evaluated as major causes of fires and potential battery safety. Therefore, this paper proposes a risk priority number evaluation method composed of severity, occurrence and detection degrees, to estimate the safety level of ESS considering operation environments and applications. Where, the severity degree is quantitatively calculated by fault cases impact of applications, magnitude of fault current and building type of ESS, and the occurrence is determined by accident rates, operation environments and degradation rates, and also the detection is estimated with engineering technology of safety devices and battery capacity. This paper also performs the modeling of the fault analysis in ESS, which is composed of distribution system, customer load, fault devices and ESS in order to evaluate fault cases based on ESS applications. From the simulation results based on the proposed safety evaluation method, it is confirmed that frequency regulation and renewable energy applications in ESS mainly installed in mountain and coast areas is adversely affected by environment factors such as dust and humidity, and detailed measures related with continuous monitoring for operation environments are strongly required to ensure the safety in ESS.