• 전기학회논문지
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• 제65권6호
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• pp.979-986
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• 2016

At present, electric power industry around the world are being gradually changed to a new paradigm, such as electrical energy storage system, the wireless power transmission. Demand for ESS, the core technology of the new paradigm, has been growing worldwide. However, it is essential to estimate the optimal capacity of ESS facilities for frequency regulation because the benefit would be saturated in accordance with the investment moment and the increase of total invested capacity of ESS facilities. Hence, in this paper, the annual optimal mathematical investment model is proposed to estimate the optimal capacity and to establish investment plan of ESS facility for frequency regulation. The optimal mathematical investment model is newly established for each season, because the construction period is short and the operation effect for the load by seasons is different unlike previous the mathematical investment model. Additionally, the marginal operating cost is found by new mathematical operation model considering no-load cost and start-up cost as step functions improving the previous mathematical operation model. ESS optimal capacity is established by use value in use iterative methods. In this case, ESS facilities cost is used in terms of the value of the beginning of the year.

• 전기학회논문지
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• 제66권6호
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• pp.905-910
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• 2017

As the development of BESS(Battery Energy Storage System), the application of BESS in load frequency control is considered as effective method. So, KEPCO(Korea Electric Power Corporation) have installed about 236MW ESS for GF(Govner Free) function from 2014. In this paper, we implemented Simulink Model for KEPCO GF ESS and analyzed one year historical operation data generated by Simulink model and actually measured frequency data. The operation results were divided into action for maintaining SOC and frequency. In addition, we also analyzed cycle life of GF ESS using two ESS cycle life model. We concluded the ESS cycle life models are not appropriate, because Most of the SOC swing in operation results are below 10%.

• 전기학회논문지
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• 제67권8호
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• pp.1009-1018
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• 2018

As the generation of renewable energy increases rapidly, the stability of the grid due to its intermittency becomes a problem. The most appropriate way to solve this problem is to combine and operate the renewable generators with the ESS(Energy Storage System). However, since the revenues of operating the ESS are less than the investment cost, many countries are implementing various incentive policies for encouraging investment of the ESS. In this paper we estimated optimal capacity of the ESS to maximize profits of renewable energy generation businesses under the incentive policy of Korea and analyzed the impact of the incentive policy on the future electric power system of Jeju island. The simulation results show that the incentive policy has significantly improved the profitability of the renewable energy businesses generation business. But the volatility of the net demand has increased as the energy stored in the ESS is discharged intensively at the time of the incentive application.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1849-1854
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• 2010

Energy Storage System(ESS) is installed at feeding line of railway substation. ESS will absorb regenerative energy when train braking and also charge electric energy when feeding line is no load condition. Absorbed and charged energy will be supplied when train is accelerating condition. Due to ESS the energy variation will be minimized and this effect is estimated.

• 전기학회논문지
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• 제67권8호
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• pp.1024-1030
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• 2018

Recently, the large scaled energy storage system(ESS) which has various functions such as peak saving, demand management, output stabilization of renewable energy and frequency regulation(FR) is being energetically installed and operated. Especially, as the use case of frequency regulation ESS, the KEPCO has demonstrated the total of 376[MW] ESS since 2014. However, there are no operational experiences and international technical standards on frequency regulation application in ESS. Therefore, this paper propose the evaluation algorithm for power system performance of ESS by considering the frequency characteristics between governor of existing generator and frequency regulation ESS, in order to verify the power system performance of ESS. And also, this paper propose an evaluation modeling for small scaled power system including the existing generator, frequency control ESS and customer loads based on the PSCAD/EMTDC S/W. From the simulation results in 360[MW] model power system, it is confirmed that frequency regulation ESS has better performances than conventional generators.

• 정보처리학회논문지B
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• 제11B권1호
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• pp.45-52
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• 2004

본 연구에서는 ESS_WMCE를 제안한다. 이 논문은 ESS_WMCE상에서 실행되는 EDSS의 설계와 구축을 기술한다. EDSS는 웹 기반 멀티미디어 공동 작업 환경에서의 동기화 오류 제어 시스템이다. 훅킹 방법에 의하여 오류를 감지하고 오류 전단 기법은 응용 공유 시스템을 이용한 수정된 모델이다. 두레는 컴퓨터 지원 협동 작업을 위한 응용을 개발하기 위하여 지원되는 좋은 프레임워크 모델이다. 이 시스템은 기본적인 서비스 기능을 가지고 있고 기능들은 객체 지향 개념으로 구현되어 있다. 이것은 소프트웨어 기술을 사용하여 웹 기반 멀티미디어 공동 작업 환경에서 발생되는 소프트웨어 오류를 신속하게 감지하고 공유시키는 데 적합하다. 본 논문은 공유되는 객체를 접근하기 위하여 URL 동기화뿐만 아니라 오류를 공유할 수 있다. 오류 발생 시에 오류 감지는 MS-Windows API에 있는 훅 킹(hooking) 방법을 이용한다. 감지된 오류는 공유되는 객체를 접근하기 위하여 오류공유가 가능하다.

• 한국산학기술학회논문지
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• 제18권5호
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• pp.738-744
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• 2017

최근 신재생에너지의 확대 보급과 더불어 전기저장장치(ESS, Energy Storage System)가 활발하게 도입되고 있다. 하지만 현재 전기저장장치에 대한 도입효과와 경제성 및 계통에 미치는 영향에 대한 구체적인 평가방법이 없어 효과적인 도입운용이 어려운 실정이다. 특히 주파수조정용 ESS에 대한 국제적인 기술표준 및 제도가 마련되지 않아, 이의 설치에 따른 전기품질, 계통영향, 기여도 등은 물론 편익 산정에 대한 종합적인 연구가 필요한 실정이다. 따라서 본 논문에서는 주파수조정용 ESS의 성능검증 방안을 마련하기 위하여, 기존발전기의 주파수조정 성능평가 방법인 미국 PJM의 AGC(Automatic Generation Control, 발전기 자동발전제어) 성능 평가방식을 분석하여, 주파수조정용 ESS의 성능평가 알고리즘을 제안하였고, 고가발전기의 정산금과 화력발전기의 정산금을 이용하여 500MW급의 주파수조정용 ESS의 도입에 따른 편익을 산정할 수 있는 경제성 평가 알고리즘을 제시하였다. 제안한 알고리즘의 유용성을 확인하기 위하여, 실 계통 데이터를 바탕으로 시뮬레이션을 수행한 결과, 전기저장장치가 기존의 발전기에 비하여 아주 우수한 성능을 가지고 있음을 확인하였고, 500MW 도입시 연간 약 3,457~4,296억의 편익이 발생함을 확인하였다.

• 전력전자학회논문지
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• 제22권4호
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• pp.330-335
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• 2017

Increased fossil fuel consumption causes global warming, environmental pollution, and abnormal climate change. Wind-generated power installation is proposed to solve this problem. Recently, the wind power plant construction case encourages the installation of the energy storage system (ESS) to improve the intermittency of wind power. The maximized ESS operation profits connected to wind power are not generated in the simplest operation pattern of charging at night and discharging at day. The battery charging efficiency improvement should be considered to get more profits. Thus, there is a possibility of increasing ESS operation profits by analyzing the battery AC and DC charging/discharging efficiency and the yearly average sealed maintenance free (SMP) in hours. In this paper, the battery impedance characteristic, AC and DC charging/discharging efficiency, and the yearly average SMP are analyzed. The operation scenario to improve the ESS battery charging efficiency connected to wind power is proposed and verified via simulation.

• 조명전기설비학회논문지
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• 제28권5호
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• pp.82-91
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• 2014

The combined generator system by integrating several renewable energy sources can share the electrical infrastructure and therefore have the advantage of constructing not only the transmission system but also the power conversion system. Among the various combined renewable system, the wind power and wave power has a high possibility of future growth due to the economic feasibility in offshore environment. This kind of large-scale combined systems might be follow the determination by the transmission system operator's directions and control the output profile by focusing at PCC. However, both renewable energies are depend on the unpredictable environmental variation; it is needed to do the compensation devices. In this paper, the ESS compensation plan is proposed to do output determination of the combined generator system by paying attention to active power of utility grid with the analysis of the controllable elements of the wind and wave power generator. The improvement of the new application technique of the combined system is confirmed through using the PSCAD/EMTDC. The entire simulation process was designed by adopting the active power control according to the reference signal of TSO.

• 전기전자학회논문지
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• 제23권1호
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• pp.188-192
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• 2019

전기저장장치가 주파수조정예비력 자원으로써 전력계통 운영에 대한 기여도가 증가됨에 따라 전기저장장치 설비용량의 신뢰성 확보가 요구되고 있으며, 이를 위해서는 전기저장장치의 가용용량에 고장률을 고려할 필요가 있다. 그러나 기존의 전기저장장치 고장률 산정방안은 전기저장장치 설비의 구조적 특징을 정확히 고려하지 못해 전기저장장치의 가용용량을 정확히 반영하지 못하고 있다. 본 논문에서는 전기저장장치 설비의 특징을 분석하고 이를 반영한 전기저장장치의 고장률 산정방안을 제안하였고 사례연구를 통하여 제안된 방안의 유효성을 검토하였다.