Power-frequency parameters of long-distance extreme-high-voltage (EHV) and ultra-high-voltage (UHV) transmission lines are the basis of power system modelling and analysis, but these parameters are especially difficult to accurately measure due to the reactance-dominated nature and strong external interference. An accurate power-frequency parameter measurement approach is proposed in this study. The idea is to utilise frequency response curve to indirectly extrapolate transmission line parameters at power frequency. As no direct measurement is conducted at power frequency, the potential power-frequency interference is avoided. A resonance-based measurement method is employed to eliminate the effect of large impedance phase angle of EHV/UHV systems and identify positive- and zero-sequence resistance with enhanced accuracy. In order to validate the effectiveness of the proposed approach, a prototype instrument was developed and used to measure power-frequency parameters of a scale-down laboratory transmission line system. Comparative results confirmed the accuracy priority of the proposed approach over existing power-frequency measurement methods. In addition, the anti-interference performance in terms of the impact of the parallel in-service transmission line also indicates the proposed approach is more advantageous as it has lower capacity requirement on the measurement device.

References

1. 1)
  - 2. North American Electric Reliability Corporation: ‘Power system model validation: a white paper by the NERC model validation task force of the transmission issues subcommittee’, 2010. Available at http://www.nerc.com/docs/pc/mvwg/MV_White_Paper_Final.pdf.
2. 2)
  - 11. Hu, Z., Xiong, M., Li, C., et al: ‘New approach for precisely measuring the zero-sequence parameters of long-distance double-circuit transmission lines’, IEEE Trans. Power Deliv., 2016, 31, (4), pp. 1627–1635.
3. 3)
  - 1. Grainger, J., Stevenson, W.: ‘Power systems analysis’ (McGraw-Hill, 1994).
4. 4)
  - 21. Nourai, A., Keri, A.J.F., Shih, C.H.: ‘Shield wire loss reduction for double circuit transmission lines’, IEEE Trans. Power Deliv., 1988, 3, (4), pp. 1854–1864.
5. 5)
  - 5. Kurokawa, S., Pissolato, J., Tavares, M.C., et al: ‘A new procedure to derive transmission-line parameters: applications and restrictions’, IEEE Trans. Power Deliv., 2006, 21, (1), pp. 492–498.
6. 6)
  - 12. Hu, Z., Xiong, M., Shang, H., et al: ‘Anti-interference measurement methods of the coupled transmission-line capacitance parameters based on the harmonic components’, IEEE Trans. Power Deliv., 2016, 31, (6), pp. 2464–2472.
7. 7)
  - 20. Omicron Energy: ‘Impedance measurement on high-voltage lines’, 2016. Available at https://www.omicronenergy.com/en/products/transmission-lines/lineimpedance-measurement/cpc-100-cp-cu1/.
8. 8)
  - 16. Martinez, J.A., Gustavsen, B., Durbak, D.: ‘Parameter determination for modeling system transients part I: overhead lines’, IEEE Trans. Power Deliv., 2005, 20, (3), pp. 2038–2044.
9. 9)
  - 22. Li, B., Guo, F., Li, X., et al: ‘Circulating unbalanced currents of EHV/UHV untransposed double-circuit lines and their influence on pilot protection’, IEEE Trans. Power Deliv., 2014, 29, (2), pp. 825–833.
10. 10)
  - 8. Wang, Y., Xu, W., Shen, J.: ‘Online tracking of transmission-line parameters using SCADA data’, IEEE Trans. Power Deliv., 2016, 31, (2), pp. 674–682.
11. 11)
  - 13. Hu, Z., Chen, Y.: ‘New method of live line measuring the inductance parameters of transmission lines based on GPS technology’, IEEE Trans. Power Deliv., 2008, 23, (3), pp. 1288–1295.
12. 12)
  - 7. North American Electric Reliability Corporation: ‘Maintaining transmission line ratings consistent with as-built conditions: good utility practices’, 2015. Available at http://www.nerc.com/pa/rrm/bpsa/Facility_Ratings_Alert_DL/Maintaining_Transmission_Line_Ratings_Good_Utility_Practices_December_2015.pdf.
13. 13)
  - 15. Meyer, W.S., Dommel, H.W.: ‘Numerical modelling of frequency-dependent transmission-line parameters in an electromagnetic transients program’, IEEE Trans. Power Appar. Syst., 1974, PAS-93, (5), pp. 1401–1409.
14. 14)
  - 19. Standardization Administration of the People's Republic of China: ‘Round wire concentric lay overhead electrical stranded conductors (GB/T 1179-2008)’, 2008.
15. 15)
  - 17. Carson, J.R.: ‘Wave propagation in overhead wires with ground return’, Bell Syst. Tech. J., 1926, 5, (4), pp. 539–554.
16. 16)
  - 9. Filho, M.B.D.C., de Souza, J.C.S., Meza, E.B.M.: ‘Off-line validation of power network branch parameters’, IET Gener. Transm. Distrib., 2008, 2, (6), pp. 892–905.
17. 17)
  - 3. Ma, J., Han, D., Sheng, W.J., et al: ‘Wide area measurements-based model validation and its application’, IET Gener. Transm. Distrib., 2008, 2, (6), pp. 906–916.
18. 18)
  - 14. Hu, Z., Xu, Z., Fan, J., et al: ‘Novel method of live line measuring the zero sequence parameters of transmission lines with mutual inductance’. 2009 IEEE Power Energy Society General Meeting, 2009, pp. 1–4.
19. 19)
  - 23. Horton, R., Wallace, K.: ‘Induced voltage and current in parallel transmission lines: causes and concerns’, IEEE Trans. Power Deliv., 2008, 23, (4), pp. 2339–2346.
20. 20)
  - 4. Xu, Z.Y., Jiao, S.H., Ran, L., et al: ‘An online fault-locating scheme for EHV/UHV transmission lines’, IET Gener. Transm. Distrib., 2008, 2, (6), pp. 789–799.
21. 21)
  - 10. Du, Y., Liao, Y.: ‘On-line estimation of transmission line parameters, temperature and sag using PMU measurements’, Electr. Power Syst. Res. , 2012, 93, pp. 39–45.
22. 22)
  - 6. Standardization Administration of the People's Republic of China: ‘Standard for hand-over test of electric equipment – electric equipment installation engineering (GB 50150-2006)’, 2006.
23. 23)
  - 18. CIGRE Working Group 13.05: ‘The calculation of switching surges C II. Network representation for energization and re-energization studies on lines fed by an inductive source’. Technical Report 32, 17-42, Electra, 1974.

Method for accurately measuring the power-frequency parameters of EHV/UHV transmission lines

References

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