• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.3
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• pp.371-381
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• 2016

This paper presents a study on reliability assessment and new contribution function development of power system including Wind Turbine Generator(WTG) combined with Battery Energy Storage System(BESS). This paper develops and proposes new reliability contribution function of BESS installed at wind farms. The methodology of reliability assessment, using Monte Carlo Simulation(MCS) method to simulate sample state duration, is proposed in detail. Forced Outage Rate(FOR) considered probabilistic approach for conventional generators is modelled in this paper. The penetration of large wind power can make risk to power system adequacy, quality and stability. Although the fluctuation of wind power, BESS installed at wind farms may smooth the wind power fluctuation. Using small size system as similar as Jeju island power system, a case study of reliability evaluation and new proposed contribution function of power system containing WTG combined with BESS is demonstrated in this paper, which would contributes to BESS reliability contribution and assessment tools of actual power system in future.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.134-135
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• 2012

This paper analyzes the characteristics of the power system of Jeju island in 2014, which has wind farms with the support of BESSs (Battery Energy Storage Systems). In the simulation, the electrical loads are predicted based on Korea Power Exchange's data and the wind turbines are considered with new installed plans within 2014. The situation that some wind farms are forced to disconnect from the grid instantaneously is considered. The BESSs are controlled by using SOC (State of Charge) and power smoothing control algorithm. The simulation results show the effectiveness of the proposed method.

• Journal of the Korean Solar Energy Society
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• v.40 no.3
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• pp.21-31
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• 2020

The government mandates gradually zero energy building and Photovoltaic power generation systems installed in buildings are emerging as the most realistic alternative to increase the independence rate of building energy. In this study, we propose a method to reduce the power consumption of households by increasing the PV capacity of balconies and applying the method used the charged electric power stored in batteries after sunset. In order to evaluate the electric power energy savings of the residential BESS, a balcony PV 1.2 kW and a battery pack 2 kWh were installed for 9 houses in 4 apartments in Seoul and Gyeonggi-do. The BESS is charged when the balcony PV is generated electric power, and when solar power generation is finished, it supplies power to the electric appliances connected to the load. As a result of installing the solar PV module 1.2 kW and 2 kWh class BESS for 3 households located in Seoul and Gyeonggi-do, the average electric power consumption saving rate was 40%. The reduction in electricity consumption in the case of zero generation surplus power by maximizing the utilization rate of BESS has been improved to about 53%. Therefore, in order to increase the self-sufficiency rate of electric energy in apartment houses, it is effective to increase the solar photovoltaic capacity of the balcony and apply the residential BESS. In the future, it is believed that the balcony PV and home BESS will play a key role in achieving mandatory zero-energy housing.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.459-460
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• 2016

본 논문은 분산전원과 베터리에너지저장장치로 구성된 독립형 DC 마이크로그리드에서 배터리 에너지저장장치의 SoC변동에 따른 새로운 출력 전압 제어 방식을 제안하고 동작과 성능을 분석한 내용에 대하여 기술하고 있다. 제안하는 제어 방식은 SoC를 검출하여 일정한 게인 값을 곱하고 그 결과를 기저전압에 더해 DC Grid전압을 산출하는 방식이다. 제안하는 시스템의 동작타당성을 체계적으로 비교 분석하기 위해 PSCAD/EMTDC 소프트웨어를 이용하여 검증하였다. 이를 기반으로 하드웨어 시뮬레이터를 제작하고 실험을 실시하여 실제 독립형 DC 마이크로그리드에 적용 가능성을 확인하였다.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.163-164
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• 2011

본 논문은 스마트그리드용 배터리 에너지 저장장치(Battery Energy Storage System, BESS)와 같은 대용량 전력변환장치의 개발 및 성능검증 시험에 사용된 대용량 시험설비에 대해 기술하였다. 대용량 시험설비는 모의 수 배전 계통 설비, DC Power Supply, 부하설비로 구성되어 있다. 모의 수 배전 설비는 개발 시험규격과 계통 상황을 모의하고, DC Power Supply는 연료전지나 배터리 등의 DC Source, 수동부하장치는 전력 변환 설비의 각종 부하들을 모의하기 위해 설계 제작하여 스마트그리드용 2MVA BESS의 성능검증 시험에 이용하고 있다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.220-221
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• 2011

본 논문에서는 EV (Electric Vehicle)용 충전 인프라 구축을 위한 BESS (Battery Energy Storage System)의 용량을 산정한다. 이를 위해 실제 대형마트의 데이터를 이용하여 EV용 충전 인프라가 구축될 경우의 추가수요전력량을 산출하고 현재의 전력수급량을 바탕으로 EV 보급시의 최대수요전력량을 예측한다. 이들을 계약전력과 비교하여 필요전력량을 분석하고 이를 바탕으로 충전 인프라에 이용되는 BESS의 용량을 산정한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.189-190
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• 2015

본 논문은 배터리에너지저장장치(BESS)를 적용하여 전력계통의 2차 주파수조정 보조서비스를 제공하기 위한 제어 방안을 검토한다. BESS가 계통운영기관의 자동발전제어를 통한 2차 주파수조정 보조서비스에 참여하기 위해서는 제어 요구량에 대한 정확한 추종이 가능 해야하고 이를 위한 효율적인 SOC 관리가 요구된다. 이를 위해 본 논문에서는 2차 주파수조정 보조서비스 제어신호를 제어대상 배터리의 SOC에 따라 배분하고 SOC가 가용범위를 벗어 날 경우 SOC 회복제어를 수행하도록 제어 방안을 제안하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.4
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• pp.529-536
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• 2015

With the growing interest of microgrid all over the world, many studies on microgrid operation are being carried out. The battery energy storage system(BESS) is a key equipment for effective operation of the microgrid. In this paper, we analyze the characteristics of the charge and discharge output voltage of the battery and the characteristics of the life-span variation and the investment cost when the state-of-charge (SOC) changes. The formulas to represent the quality of the charge and discharge output voltage of the battery and the economics due to the life-span variation and the investment cost according to DOD(Depth of Discharge) are derived. The methodology of determining the proper operation ranges of the battery SOC with varying the weighting of the quality of its charge and discharge output voltage of the battery and the economics due to its life-span variation and the investment cost is presented using these formulas.

• KEPCO Journal on Electric Power and Energy
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• v.1 no.1
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• pp.29-32
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• 2015

Since the characteristics of Renewable Energy Sources like wind turbine generators are very different from those of existing thermal power generators and their response to the sudden change of the frequency are not as good as that from thermal power generators. Especially when the penetration level of the wind power generation is substantially high, the output from the WTG would be possibly limited to keep the stability of power systems. For this, this paper implements the process for calculating the dynamic penetration limit of WTG and analyze the potential application of BESS for increasing the dynamic penetration limit of WTG.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.4
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• pp.595-606
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• 2022

Korea has the characteristics of traditional power system such as large-scale power generation and large-scale power transmission systems, including 20 GW large-scale power generation complexes in several regions with unit generator capacity exceeding 1.4 GW, 2-3 ultra-high-voltage transmission lines that transport power from large-scale power generation complexes, and 6 ultra-high-voltage transmission lines that transport power from non-metropolitan areas to the metropolitan area. Due to the characteristics of the power system, the penetration level for renewable energy is low, but due to frequency stability issue, some generators are reducing the output of generators. In the future, the issue of maintaining the stability of the power system is expected to emerge as the most important issue in accordance with the policy of expanding renewable energy. When non-inertial inverter-based renewable energy, such as solar and wind power, surges rapidly, the means to improve the power system stability in an independent system is to install a natural inertial resource synchronous condenser (SC) and a virtual inertial resource BESS in the system. In this study, we analyzed the effect of renewable energy on power system stability and the BESS effect to maintain the minimum frequency through a power system simulation. It was confirmed that the BESS effect according to the power generation constraint capacity reached a maximum of 122.81 %.