Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on the Site Acceptance Test(SAT) Evaluation Algorithm of Energy Storage System using Li-ion Battery

리튬이온전지를 이용한 전기저장장치의 SAT용 성능평가 알고리즘에 관한 연구

  • Received : 2019.04.30
  • Accepted : 2019.06.07
  • Published : 2019.06.30
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Abstract

Recently, standardization of installation progress and technology of site acceptance test(SAT) for energy storage system(ESS) are being required due to performance of ESS depending on working condition and environment even though the quality and safety of each component of ESS　is guaranteed. And also, it has been required to perform not only performance testing by H/W equipments but also performance verification by S/W tool, in order to more accurately and reliably validate the performance of the ESS in advanced countries. Therefore, this paper proposes evaluation algorithm for SAT to evaluate performance of ESS and presents modeling of SAT test equipment for ESS by using PSCAD/EMTDC. Furthermore, 30[kW] scaled portable test equipments is implemented based on the proposed algorithm and modeling. From the various simulation and test results, it is confirmed that performance of ESS related to characteristics of capacity and Round-trip efficiency, Duty-cycle efficiency, low voltage ride through(LVRT) and Anti-islanding can be accurately evaluated and that the simulation results of PSCAD/EMTDC are identical to test results of 30[kW] test equipment.

ESS는 각 제품의 품질 및 안전성이 보장되더라도 현장에서 조립하는 사람 혹은 환경에 따라 완성 품질이 달라지므로, 설치공정의 표준화 및 현장에 설치된 ESS에 대한 안전성 시험평가기술의 개발이 요구되고 있다. 또한, 선진국에서는 ESS의 성능을 보다 정확하고 신뢰성 있게 검증하기 위하여, H/W에 의한 성능 시험뿐만 아니라 S/W에 의한 성능검증도 요구하고 있는 실정이다. 따라서 본 논문에서는 현장에 설치되어 있는 ESS의 성능을 평가하기 위하여 SAT(Site Acceptance Test)용 평가알고리즘을 제안하였다. 또한, 전력계통 상용해석 프로그램인 PSCAD/EMTDC를 이용하여 ESS의 SAT용 시험장치를 모델링 하고, 이를 바탕으로 30[kW]급 시험장치를 구현하였다. 상기에서 제안한 평가알고리즘을 이용하여 다양한 시뮬레이션과 특성시험을 비교한 결과, 용량 및 Round-trip 효율, Duty-cycle 추종특성, LVRT 특성, Anti-islanding특성에 대한 ESS의 성능을 정확하게 평가할 수 있었고, 모델링에 의한 특성과 시험장치에 의한 특성이 거의 동일하게 나타나, 본 논문에서 제안한 평가알고리즘의 유용성을 확인하였다.

Keywords

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Fig. 1. Pattern of capacity and Round-trip

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Fig. 2. Capacity and Round-trip test algorithm

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Fig. 3. Pattern of PNNL-22010

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Fig. 4. Duty-cycle algorithm

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Fig. 5. LVRT test algorithm

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Fig. 6. Anti-islanding test algorithm

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Fig. 7. Entire modeling of potable test equipment for ESS

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Fig. 8. Configuration of portable test equipment for ESS

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Fig. 9. Characteristic of Capacity and Round-trip

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Fig. 10. Characteristic of Duty-cycle

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Fig. 11. Characteristic of LVRT

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Fig. 12. Characteristic of Anti-islanding

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Fig. 13. Characteristic of Capacity and Round-trip

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Fig. 14. Characteristic of Duty-cycle

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Fig. 15. Characteristic of LVRT

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Fig. 16. Characteristic of Anti-islanding

Table 1. Classification for SAT

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Table 2. Instantaneous voltage drop condition of LVRT

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Table 3. Output condition of ESS

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Table 4. Test condition of Anti-islanding A

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Table 5. Test condition of Anti-islanding B&C

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Table 6. Simulation conditions

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