• 제목/요약/키워드: Electric power and energy

검색결과 3,159건 처리시간 0.031초

실시간 시뮬레이터 기반의 스마트 인버터 제어기능 시험 환경 구축 및 시험 결과 (Test bed for Advanced function of Smart Inverter and Results Based on Real-Time Simulation Platform)

  • Sim, Junbo;Ban, Minho;Lim, Hyeonok;Cho, Seong-Soo
    • KEPCO Journal on Electric Power and Energy
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    • 제7권1호
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    • pp.107-114
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    • 2021

  • High penetration of renewable energy generators causes unnecessary investment for power system facilities. Especially with Korean government policies such as Renewable Energy 3020 and Inter-connection support Responsibility of KEPCO for 1 MW DERs, the applications of DER interconnection in distribution system have been increasing. To save the investment, smart control functions for DERs are required and the test bed for the inverters which have not been prepared are necessary to insure DER inter-connection stability. For this, test bed for advanced functions of a smart inverter has been constructed and the tests for necessary functions have been implemented. In this paper, the test bed and environment as well as specifications are introduced and the test results for the validation of the functions are analyzed.

  • https://doi.org/10.18770/KEPCO.2021.07.01.107 인용 PDF KSCI

Development of the Control System for Fast-Responding Frequency Regulation in Power Systems using Large-Scale Energy Storage Systems

  • Lim, Geon-Pyo;Park, Chan-Wook;Labios, Remund;Yoon, Yong-Beom
    • KEPCO Journal on Electric Power and Energy
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    • 제1권1호
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    • pp.9-13
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    • 2015

  • Energy storage systems (ESS) can be used to provide frequency regulation services in a power system to replace traditional frequency regulation power plants. Battery ESS, in particular, can provide "fast-responding frequency regulation," wherein the facility can respond immediately and accurately to the frequency regulation signal sent by the system operator. This paper presents the development and the trial run results of a frequency regulation control system that uses large-scale ESS for use in a large power system. The control system was developed initially for the 4 MW ESS demonstration facility in Jocheon Jeju Island, and was further developed for use in the 28 MW ESS facility at the Seo-Anseong substation and the 24 MW ESS facility at the Shin-Yongin substation to provide frequency regulation services within mainland Korea. The ESS facility in Seo-Anseong substation responds to a sudden drop in frequency via governor-free control, while the ESS facility in Shin-Yongin responds via automatic generator control (AGC).

  • https://doi.org/10.18770/KEPCO.2015.01.01.009 인용 PDF KSCI

ESS 안전성 개선을 위한 결로 운전 조건 고려 고체절연물 연면 절연파괴특성 분석 (Analysis on Solid Insulator Flashover Characteristics on Moisture Contamination for Electrical Insulation Improvement of ESS)

  • 김진태;이승용;김지영;석복렬
    • KEPCO Journal on Electric Power and Energy
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    • 제7권2호
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    • pp.317-321
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    • 2021

  • As the large-scale renewable energy power plant increases, the high-capacity and compact Energy Storage System (ESS) is required. However, this trend could reduce the insulation reliability of ESS. In this study, the surface flashover characteristics for four types of solid insulators are investigated in the uniform electric field with AC and Lightning Impulse (LI) voltage waveforms under various contamination levels. In addtion, insulator surfaces are compared based on the contact angle before and after surface flashover. The experimental results show that AC flashover voltage is dependent on the materials and the contamination level, but LI flashover voltage is only associated with the contamination level. Especially, AC flashover voltage of PC (PolyCarbonate) is higher than that of other insulators, which is associated with the unique and sequential creepage discharge propagation pattern of PC. The localized discharges on the surface of PC form corresponding tracking points. Then, the interconnected trackings result in the complete flashover. This flashover patterns degrade the surface of PC much more than that of epoxy and Bulk Molding Compoud (BMC). Thus, the contact angle of PC is significantly reduced compared to that of other insulators. The increased hydrophilicity in the surface of PC enhances the insulator surface conductivity.

  • https://doi.org/10.18770/KEPCO.2021.07.02.317 인용 PDF KSCI