The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Required Capacity Assessment of Energy Storage System for Relieving Operation Condition of SPS Using Generator Acceleration Energy

발전기 가속에너지를 이용한 고장파급방지장치 운전조건 완화용 전기저장장치 적정용량 산정방안

  • Song, Seung-Heon (Smart Grid Research Center, Dept. of Electrical Engineering, Chonbuk National University) ;
  • Choi, Woo-Yeong (Smart Grid Research Center, Dept. of Electrical Engineering, Chonbuk National University) ;
  • Gwon, Han-Na (Smart Grid Research Center, Dept. of Electrical Engineering, Chonbuk National University) ;
  • Kook, Kyung Soo (Dept. of Electrical Engineering, Chonbuk National University)
  • Received : 2018.11.06
  • Accepted : 2018.12.07
  • Published : 2019.01.01
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Abstract

Due to the highly concentrated power plants integrated through the limited transmission lines in Korea, a Special Protection System(SPS) has been applied to stabilize the power systems by instantly tripping the pre-determined generators in a large-scaled power plant when a fault occurs on the drawing transmission lines. Moreover, power outputs of those generators are constrained to avoid any activation of Under Frequency Load Shedding(UFLS) even after those generators are tripped by SPS action. For this, this paper proposes a method for calculating the required capacity of Energy Storage System(ESS) expected to relieve the operating constraints to generators using its fast response for controlling power system frequency. The proposed method uses the generator acceleration energy to derive the stable condition during the SPS action. In addition, its effectiveness is verified by the case studies adopting actual SPS operations in Korean power systems.

Keywords

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그림 1 발전기 차단용 고장파급방지장치에 의한 과도안정도 확보 Fig. 1 SPS Application to Transient Stability

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그림 2 전기저장장치를 이용한 과도 안정도 확보 Fig. 2 ESS Application to Transient Stability

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그림 3 고장 지속시간동안의 가속에너지 산정 Fig. 3 Accelerating energy calculation for the fault duration time

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그림 4 임계고장제거시간 산정절차 Fig. 4 Procedure of Calculating CCT

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Fig. 5 Simulation Result of Transient Stability Analysis 그림 5 과도 안정 해석 모의 결과

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그림 6 전기저장장치 적정용량 산정 절차 Fig. 6 Assessment Procedure of Required ESS Capacity

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그림 7 765kV 송전선로 고장 시 고장파급방지장치 및 전기저장 장치 동작 모의 절차 Fig. 7 Simulation Procedure for operating SPS and ESS at the Fault on 765kV T/L

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그림 8 전기저장장치 적정용량 적정성 검증 결과 (동해안 사례 연구) Fig. 8 Simulation result for validating the ESS capacity (east coast case)

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그림 9 전기저장장치 적정용량 적정성 검증 결과(서해안 사례 연구) Fig. 9 Simulation result for validating the ESS capacity(west coast case)

표 1 전기저장장치 적정용량 산정 결과(동해안 사례 연구) Table 1 Assessment result of required ESS Capacity (east coast case)

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표 2 전기저장장치 적정용량 산정 결과 (서해안 사례 연구) Table 2 Assessment result of required ESS Capacity (west coast case)

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References

  1. "The 8th Basic Plan for Long-term Electricity Supply and Demand", MOTIE, Dec, 2017.
  2. "The Criteria and Procedures to Determine the Limit of Generator Shedding by SPS to Enhance Transient Stability", KPX, March, 2014.
  3. Jae-Gul Lee, Solyung Jung, Jung-Hum Choi, Yong-Hak Kim, Yong-Beum Yoon, "A Study on Energy Storage System (ESS) Application for Dynamic Stability Improvement and Generation Constraint Reduction", Trans. KIEE. Vol. 66, No. 11, Nov, 2017.
  4. Hyeong-Pil Bang, Hwa-Chang Song, Yong-Gu Ha, Gu-Han Kim, Tea-Ok Kim, "ESS Operation Strategy to Secure Power System Stability", KIEE conference, July, 2017.
  5. SeungHeon Song, WooYeong Choi, KyungSoo Kook, HwaChang Song, GuHan Kim, TaeOk Kim, "A Study on the Application of BESS for the Operation Condition Mitigation of SPS", KIEE conference, July, 2017.
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