Influencing Factors of the Power Fluctuation on the Ultra High Voltage Transmission Line Caused by Faults at the Remote Ends of the Interconnected Grid

Zhi An^*, Ansi Wang, Huadong Sun, Yong Tang

China Electric Power Research Institute, Beijing, China.

DOI: 10.4236/jpee.2014.24084                

Abstract

After the North China grid and the Central China grid get into connection with the UHVAC demonstration, a new phenomenon is discovered according to some simulations. That is, the faults at the remote end of the UHV interconnected grid will result in significant power fluctuation and voltage drop on the UHV transmission line and even system splitting. But the faults near the UHV line only have marginal effects. Further, the simulation results also indicate that the short-circuit current of the buses near the UHV line is larger than that of the buses far away from the UHV line. This phenomenon is divergent from the traditional view. In this paper, the detail will be introduced, and the factors influencing the system stability after faults are presented and analyzed. The results indicate that transmission power of the UHV line and of the lines between the remote end and the major grid influence the fluctuation on UHV line. The load model and the grid structure of the remote end also have effect on it. Finally, corresponding control scheme is presented to improve the operation conditions of the UHV interconnected grid and ensure its security and stability.

Keywords

Ultra High Voltage; UHV Interconnected Grid; Faults at Remote End; Power Fluctuation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Liu, Z.Y. (2005) Ultra-High Voltage Grid. China Economic Publishing House, Beijing.
[2]	Shu, Y.B. and Zhang, W.L. (2007) Research of Key Technologies for UHV Transmission. Proceedings of the CSEE, 27, 1-6.
[3]	Shu, Y.B., Zhang, W.L., Zhou, X.X., Tang, Y. and Guo, Q. (2007) Security Evaluation of UHV Synchronized Power Grid. Proceedings of the CSEE, 27, 1-6.
[4]	Zhang, W.L., Zhou, X.X., Yin, Y.H., Tang, Y. and Guo, Q. (2010) Composition and Security Analysis of “North China- Central China-East China” UHV Synchronous Power Grid. Proceedings of the CSEE, 30, 1-5.
[5]	Guo, J.B., Zhou, J., Guo, Q., et al. (2011) Digital and Analog Hybrid Simulation of Interconnected UHVAC/UHVDC Transmission System from North China via Central China to East China. Power System Technology, 35, 55-59.
[6]	Sun, Q.Z., Cai, Z.X., Li, A.M., Li, L. and Wu, K.C. (2009) A Short-Circuit Current Over-Limited Mechanism of 500 kV Power System and the Adaptability of Limiting Measures. Automation of Electric Power Systems, 33, 92-96.
[7]	Chen, F., Li, X.R., Chen, H.H., Tang, W.W. and Liu, Y.Y. (2004) Effect of Induction Motor Model Structure and Parameters on Simulating Computation of Electric Power System Transient Stability. Electric Power Automation Equipment, 24, 29-33.
[8]	Han, D., Ma, J., He, R.M., Yue, C.Y. and Zhang, J. (2008) Effect of Uncertainty in Load Model on Power System Dynamic Simulation. Proceedings of the CSEE, 28, 69-74.
[9]	Yang, J.X. and Ma, J. (2010) Impact of Load Model on the Error of Power System Hybrid Simulation. Journal of North China Electric Power University, 37, 38-42.
[10]	Zhang, H.B., Tang, Y., Zhang, D.X. and Hou, J.X. (2007) Present Situation and Prospect of Load Modeling Technique. Power System Technology, 31, 6-10.
[11]	Liu, J.Q., Tao, J.Q., Xu, X.W. and Zhang, H.P. (2007) A Survey on Research of Load Model for Stability Analysis in Foreign Countries. Power System Technology, 31, 11-15.
[12]	Zhang, H.B., Tang, Y., Zhang, D.X., et al. (2007) Analysis on Effects of Different Load Models on Transmitting Capacity of Northeast China Power Grid. Power System Technology, 31, 55-58.
[13]	Zhang, Y.K., Cai, Z.X., Li, A.M. and Xu, M. (2009) An Optimization Algorithm for Short-Circuit Current Limitation of 500 kV Power Grid by Adjusting Power Grid Configuration. Automation of Electric Power Systems, 33, 34-39.