An Adaptive Setting Method for the Overcurrent Relay of Distribution Feeders Considering the Interconnected Distributed Generations

  • Jang Sung-Il (HANKOOK IED Co.) ;
  • Kim Kwang-Ho (Department of Electrical and Computer Engineering, Kangwon National University) ;
  • Park Yong-Up (Department of Electrical and Computer Engineering, Kangwon National University) ;
  • Choi Jung-Hwan (Taegwang E&C) ;
  • Kang Yong-Cheol (Division of Electronics and Information Engineering, Chonbuk National University) ;
  • Kang Sang-Hee (Department of Electrical Engineering, Myongji University) ;
  • Lee Seung-Jae (Department of Electrical Engineering, Myongji University) ;
  • Oshida Hideharu (Mitsubishi Electric Corporation) ;
  • Park Jong-Keun (School of Electrical Engineering, Seoul National University)
  • Published : 2005.12.01

Abstract

This research investigates the influences of distributed generations (DG), which are interconnected to the bus by the dedicated lines, on the overcurrent relays (OCR) of the neighboring distribution feeders and also proposes a novel method to reduce the negative effects on the feeder protection. Due to the grid connected DG, the entire short-circuit capacity of the distribution networks increases, which may raise the current of the distribution feeder during normal operations as well as fault conditions. In particular, during the switching period for loop operation, the current level of the distribution feeder can be larger than the pickup value for the fault of the feeder's OCR, thereby causing the OCR to perform a mal-operation. This paper proposes the adaptive setting algorithm for the OCR of the distribution feeders having the neighboring dedicated feeders for the DG to prevent the mal-operations of the OCR under normal conditions. The proposed method changes the pickup value of the OCR by adapting the power output of the DG monitored at the relaying point in the distribution network. We tested the proposed method with the actual distribution network model of the Hoenggye substation at the Korea Electric Power Co., which is composed of five feeders supplying the power to network loads and two dedicated feeders for the wind turbine generators. The simulation results demonstrate that the proposed adaptive protection method could enhance the conventional OCR of the distribution feeders with the neighboring dedicated lines for the DG.

Keywords

References

  1. P. P. Barker, and R. W. de Mello, 'Determining the impact of distributed generation on power systems: Part1-Radial distribution systems,' IEEE, Power Engineering Society Summer meeting, Vol. 3, pp. 1645-1656, 2000 https://doi.org/10.1109/PESS.2000.868775
  2. Thomas Ackermann, Goran Andersson, Lennart Soder, 'Electricity market regulations and their impact on distributed generation,' IEEE International Con. on Electric Utility Deregulation and Restructuring and Power Technologies, 2000, City University, London, 4-7, pp. 608 – 613, April 2000 https://doi.org/10.1109/DRPT.2000.855735
  3. W. J. S. Rogers, 'The parallel operation of a generating plant within a regional electricity company's distribution network,' IEE Colloquium on the parallel operation of a generating plant within a public electricity network, Chester, UK, Feb 1991
  4. Jiang Fan and S. K. Salman, 'The effect of integration of wind farms into utility network on voltage control due to the co-ordination of AVC relays,' Proc. of the 4th International Con. On Advances in Power System Control, Operation and Management, APSCOM-97, Hong Kong, pp. 260-265, November 1997
  5. D. T. Rizy, W. T. Jewell, and J. P. Stovall, 'Operational and design considerations for electric distribution systems with dispersed storage and generation (DSG),' IEEE Trans. on Power Apparatus and Systems, Vol. PAS-104, No. 10, pp. 2864-2871, October 1985 https://doi.org/10.1109/TPAS.1985.319131
  6. Hird C. M., Leite, H., Jenkins N. and Li H., 'Network voltage controller for distributed generation,' Generation, Transmission and Distribution, IEE Proceedings, Vol. 151, Issue: 2, 2pp. 150-156, March 2004 https://doi.org/10.1049/ip-gtd:20040083
  7. Roger C. Dugan and Dwight T. Rizy, 'Electric distribution protection problems associated with the interconnection of small, dispersed generation devices,' IEEE Trans. on Apparatus and Systems, Vol. PAS-103, No. 6, pp. 1121-1127, June 1984 https://doi.org/10.1109/TPAS.1984.318438
  8. H. B-L Lee, S. E. Chase, and R. D. Dugan, 'Overvoltage considerations for interconnecting dispersed generators with wye-grounded distribution feeders,' IEEE Trans. on Power Apparatus and Systems, pp. 3587-3594, December 1984
  9. Cooper Power Systems, Electrical distribution system protection, 3d ed. Cooper Industries, 1990
  10. Manitoba HVDC Research Centre, PSCAD/EMTDC user's manual. Canada, 1986
  11. Mita-Teknik, 'Technical Information - Calibration routine for WP4060 Connection Model,' Germany, 1999
  12. Paresh C. Sen, Principles of Electric Machines and Power Electronics. WILEY, Copyright © 1997
  13. Vestas Wind Systems A/S, Technical report of wind turbine generations, 2001