Study on the Insulation Resistance Detection Technique of Photovoltaic Power Generation Facilities

  • Authors

    • Ki-Yeon Lee
    • Dong-Woo Kim
    • Young-Bae Lim
    • Soon-Young Kwon
    • In-Ho Ryu
    https://doi.org/10.14419/ijet.v7i3.24.22647
  • DC Power Line, Insulation Resistance, Electrical Safety, Asymmetric Detection Circuit, Ground fault, Photovoltaic Facilities.

  • Abstract

    Background/Objectives:This paper explains the insulation resistance detection technology to secure electrical safety as there is possibility of electricity disaster in the case of insulation failure in DC power line of photovoltaic power generation facilities.

    Methods/Statistical analysis:An algorithm was developed to measure and calculate insulation performance of each power line by using an asymmetric high resistance circuit for voltage size generated in a live condition. It calculates total insulation resistance including DC power facilities by using an asymmetric voltage measurement circuit, and then insulation resistance of each (+)/(-) power line by using a symmetric voltage measurement circuit. A failure location can be assumed based on the ratio of calculated insulation between (+) and (-) power lines.

    Findings:In the case of DC power facilities, realtime monitoring of insulation condition is not possible as leakage current cannot be measured by using ZCT. Currently, the megger is used for measurement in a power-off condition. However, test in a live condition can detect photovoltaic panel failure or insulation condition of power lines. In this paper, we developed an algorithm for insulation performance by using an asymmetric high resistance detection circuit as well as technology to detect failure location of string based on the characteristics of photovoltaic power facilities. Accordingly, we suggested methods to secure electrical safety with realtime monitoring of DC power facilities and testing equipment.

    Improvements/Applications:The future development of insulation monitoring equipment in a live condition and state diagnosis device using the DC power line insulation performance algorithm will contribute to electrical safety of DC power facilities.

     

  • References

    1. [1] Won-Pyo Hong. A Matlab/Simulink-Based PV array-Supercapacitor Model Employing SimPowerSystem and Stateflow Tool Box. Journal of the Korean Institute of Illuminating and Electrical Installation Engineers. 2014Dec;28(12):18-29.

      [2] Xiaomeng Su, Yaojie Sun, and Yandan Lin. Analysis on Leakage Current in Transformerless Single-Phase PV Inverters Connected to the Grid, Power and Energy Engineering Conference, pp.1-5, 2011.

      [3] Mandeep Singh, Rajeev Khurana, Prateek Jain. Low Cost High Voltage Battery String Monitoring System. 2015; 2015 Intl. Conference on Computing and Network Communications (CoCoNet'15), Dec. 16-19.

      [4] IEC. IEC 60479-1; Effects of current on human beings and livestock – Part1: General aspects 2005.

      [5] T. Tran-Quoc, H. Colin, C. Duvauchelle, B. Gaiddon, C. Kieny, C. LE Thi Minh, et al.Transformerless Inverters and RCD: What’s the Problem?. 2010; 25th European Photovoltaic Solar Energy Conference and Exhibition, pp.4554-4559.

      [6] Hee-Sun Kim, Song-Yop Hahn, Hoo-Sek Han. Development of DC Leakage Current Sensor for Solar Power Generation System. The Transactions of the Korean Institute of Electrical Engineers. 2014;63(6), pp. 828～833.

      [7] F. L. Hunt. Megger and other tests on suspension insulators. Proceedings of the American Institute of Electrical Engineers. 2013;35(6):861-864.

      [8] Ministry of Trade, Industry and Energy. Electric Utility ACT. https://elaw.klri.re.kr, last accessed 21 MAR 2017.

      [9] Jishun Jiang, Hua Ji. Study of Insulation Monitoring Device for DC System Based on Multi-switch Combination. 2009 Second International Symposium on Computational Intelligence and Design.2009:429-433. DOI:10.1109/ISCID.2009.115

      [10] Kyu-Tae Kim, Kwang-Min Yu. A New Methodfor Insulation Resistance Measurementat Low Voltage Levelusing Changeof Effective Resistance. XIX IMEKO World CongressFundamental and Applied MetrologySeptember 6−11, 2009, Lisbon, Portugal. pp.958-959

  • Downloads

  • How to Cite

    Lee, K.-Y., Kim, D.-W., Lim, Y.-B., Kwon, S.-Y., & Ryu, I.-H. (2018). Study on the Insulation Resistance Detection Technique of Photovoltaic Power Generation Facilities. International Journal of Engineering & Technology, 7(3.24), 206-209. https://doi.org/10.14419/ijet.v7i3.24.22647

    Received date: 2018-12-01

    Accepted date: 2018-12-01