Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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A Case Study on the Islanding Detection Protection of PV System and ESS System

태양광 발전과 ESS 시스템의 연계운전시 단독운전 방지 사례 연구

  • Lim, Jong Rok (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Hwang, Hye-Mi (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Shin, Woo Gyun (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Ju, Young-Chul (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Jung, Young Seok (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Kang, Gi-Hwan (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research) ;
  • Ko, Suk-Whan (Photovoltaics Laboratory, New and Renewable Energy Institute, Korea Institute of Energy Research)
  • 임종록 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 황혜미 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 신우균 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 주영철 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 정영석 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 강기환 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실) ;
  • 고석환 (한국에너지기술연구원 신재생에너지연구소 태양광 연구실)
  • Received : 2019.01.03
  • Accepted : 2019.02.20
  • Published : 2019.02.28
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Abstract

BIPV or BAPV installation applied to building is increasing through public utility mandates enterprise. Solar PV energy generates only during the day, but if it is operated in convergence with ESS, which stores electrical energy, it can restrain the fossil energy used in buildings throughout the day. A solution is to converge with PV system and ESS. However, PV systems and ESS connected to the power grid in parallel can cause problems of electrical stability. A study was conducted on the case of failure to detect islanding operation under the parallel operation of PV generation and ESS that are connected in parallel to power grid. Experiments conducted various non-islanding detections under the operating conditions. In the experiment results, when one PCS - PV inverter or ESS inverter - was operating under the islanding condition, it stopped working within 0.5 seconds of the Korean grid standard. However, when both of PV inverter and ESS inverter were operating at the same time under the islanding situation, the anti-islanding algorithm did not operate normally and both inverters continuously supplied power to the connected RLC loads. islanding detection Algorithm developed by each inverter manufacturer has caused this phenomenon. Therefore, this paper presented a new test standard for islanding detection.

Keywords

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Fig. 1 Configuration diagram for islanding detect test

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Fig. 2 The test results for islanding detect of one inverter

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Fig. 3 The results for islanding detect of case 3 (R load capacity: 40 [kW])

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Fig. 5 The results for islanding detect of case 5 (R load capacity: 10 [kW])

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Fig. 4 The results for islanding detect of case 4 (R load capacity: 0 [kW])

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Fig. 6 The results for islanding detect of case 6(R load capacity: 15 [kW])

Table 1 Specification of test inverters

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Table 2 The description of test case for inverter output and load capacity

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