• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.726-737
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• 2017

The use of energy storage systems (ESSs) has become a feasible solution to solve the wind power intermittency issue. However, the use of ESSs increases the system cost significantly. In this paper, an optimal power flow control scheme to minimize the ESS capacity is proposed by using the zero-phase delay low-pass filter which can eliminate the phase delay between the dispatch power and the wind power. In addition, the filter time constant is optimized at the beginning of each dispatching interval to ensure the fluctuation mitigation requirement imposed by the grid code with a minimal ESS capacity. And also, a short-term power dispatch control algorithm is developed suitable for the proposed power dispatch based on the zero-phase delay low-pass filter with the predetermined ESS capacity. In order to verify the effectiveness of the proposed power management approach, case studies are carried out by using a 3-MW wind turbine with real wind speed data measured on Jeju Island.

• 전력전자학회논문지
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• 제21권2호
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• pp.160-167
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• 2016

An energy storage system (ESS) is applied to increase the energy efficiency of large plants or buildings that consume much energy, to improve the power quality of power systems, and to stabilize renewable energy source such as photovoltaic or wind turbine. The ESS is composed of a power conditioning system (PCS) and an energy storage. The battery is used as the energy storage. The battery is needed to design and verify a hardware and control system of PCS. Usually, a battery simulator is used instead of a battery, which is costly and hard to manage. In this paper, the development of the battery simulator for performance verification of the MW-class PCS is described. The battery simulator simulates the charging and discharging characteristics of batteries to design and verify the hardware and control system of PCS.

• Journal of Electrical Engineering and Technology
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• 제13권3호
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• pp.1173-1184
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• 2018

The lifetime of a lithium-ion battery is one of the most important issues of the energy storage system (ESS) because of its stable and reliable operation. In this paper, the lifetime management method of the lithium-ion battery for energy storage system is proposed. The lifetime of the lithium-ion battery varies, depending on the power usage, operation condition, and, especially the selected depth of discharge (DOD). The proposed method estimates the total lifetime of the lithium-ion battery by calculating the total transferable energy corresponding to the selected DOD and achievable cycle (ACC) data. It is also demonstrated that the battery model can obtain state of charge (SOC) corresponding to the ESS operation simultaneously. The simulation results are presented performing the proposed lifetime management method. Also, the total revenue and entire lifetime prediction of a lithium-ion battery of ESS are presented considering the DOD, operation and various condition for the nations of USA and Korea using the proposed method.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.137-138
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• 2013

This paper proposes the single-phase double-conversion UPS(Uninterruptible Power Supply) with ESS(Energy Storage System). The Proposed system is operating in three modes, which are normal mode, battery mode, and bypass mode. Not only in black-out but also in peak load times, the system is operating in battery mode which is using the stored energy of the battery to manage the power effectively. The validity of proposed system could be verified by simulations and experiments.

• 한국전자통신학회논문지
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• 제13권1호
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• pp.29-34
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• 2018

ESS가 연계된 시스템은 24시간 충 방전 스케줄링을 수행되어야 하므로 시스템이 중단되지 않고 운영, 관리되어야 하며, 전력 IT설비의 고장 발생이나 통신장애가 발생된 경우라도 ESS시스템의 스케줄링이 정상적으로 이루어져야 한다. 따라서, 다양한 장애가 발생하더라도 이를 능동적으로 대처하여 고정밀의 전력데이터를 수집, 관리하고 ESS 시스템을 제어하는 시스템이 요구되고 있다. 본 논문에서는 태양광 발전설비와 연계된 ESS 시스템을 대상으로 통신 장애 발생을 대처하는 통신 이중화된 전원관리유닛과 마이크로그리드 사이트 관리, 유지보수 및 모니터링을 수행할 수 있는 통합 관리 시스템을 제안한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.213-214
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• 2015

국내에 수요자원 거래시장은 개설이 되었지만 아직까지 여러 목적에 맞는 최적 입찰전략에 대해서는 논의된 바가 많지 않다. 본 논문에서는 수요자원 중에서도 특히 산업용 수용가 ESS(Energy Storage System)에 대해서 경제성 DR(Demand Response) 시장에 참여 할 때 최대의 이익의 얻을 수 있는 입찰전략을 제시하였다. 그리고 이익 뿐만 아니라 유찰 위험까지 고려할 수 있는 현대 포트폴리오 이론을 적용한 입찰전략을 제시하였다.

• 전기학회논문지
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• 제64권10호
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• pp.1508-1516
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• 2015

This paper proposes the optimal operation of ESS (Energy Storage System) in the substation of urban railway in an economical point of view. Since the load patterns of urban railway have different characteristics with the general power demand pattern, the characteristics motivate us to develop the optimal operation algorithm for ESS under Korean electricity billing system. We also introduce two different ESS operation strategies for peak load shaving and electricity consumption charge minimization respectively, and formulate each scheme. Historical data from Namgwangju substation are used for economical comparison of the strategies. The results show that the proposed algorithm is the most cost-effective ESS operation scheme among the strategies and reduces around 5 percent of electric charges compared to the charge without ESS operation.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 추계학술대회 논문집
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• pp.239-240
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• 2013

The increased demand for conventional energy sources, and international oil price rises are driving societies toward research and development of renewable energy. A large number of their installations and penetrations will bring an instability distribution power system. Also, load concentration problem at specific time can cause the shortage of power reserve margin. To deal with these problems, the development of energy storage systems (ESS) is required. This paper proposes the 1MW grid-connected ESS with Li-ion battery and power conditioning system (PCS). The performances of the 1MW grid-connected ESS are evaluated and verified with the PSCAD/EMTDC based simulation test.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.639-640
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• 2015

본 논문에서는 일간 시간대별 에너지저장장치 (Energy Storage System, ESS) 최적 충 방전량 스케줄링을 이용하여 계통연계형 마이크로그리드 내에 설치되는 ESS의 용량을 산정한다. 대상 마이크로그리드의 과거 부하데이터를 이용하여 절감하고자 하는 양을 정하고, 이를 이용하여 전력변환장치(Power Conditioning System, PCS)의 정격출력량을 산정한다. ESS용량의 기준점을 정하여 이분법 적용구간을 설정하고, 반복연산을 통해 최적 ESS용량을 찾는 과정을 제시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.615-616
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• 2015

신재생에너지인 태양광발전으로 발생하는 전력과 부하에서 소비되는 소비전력으로 ESS(Energy Storage System)의 한 종류인 BESS(Battery Energy Storage System)의 운영 알고리즘을 제안 및 실증하고, 그 알고리즘은 부하를 평준화 시켜 계통에 걸리는 부담을 줄이고, 비용을 최소화 하며, 경제적으로 뛰어난 전력운영을 목표로 한다.