The broadband frequency characteristics of major equipment in the ±800 kV converter station and their influences to the short-circuit fault transient

Abstract Due to the wide application of high-order resonant and nonlinear electric equipment in the UHVDC converter station, the electromagnetic transient process is a complex issue during the short-circuit fault transient of the system caused by lightning strike or other reasons. In this study, firstly, an operating ±800 kV DC line is artificially short-circuited to simulate the flashover fault process. The instantaneous voltages and currents and the electrical fields are measured by advanced sensors and high sampling rate recording devices at different points in the converter station, in order to comprehensively study the high-frequency characteristics of the UHVDC system. Then, the portal impedances of the major UHVDC equipment as well as the stray parameters are systematically measured in an actual ±800 kV station. Based on the data measured, the accurate high-frequency characteristics of the ±800 kV converter station are analyzed. The results of the study can be used to guide the EMC and relay protection designs of the UHVDC converter station, so that the stability of the system can be improved.

[1]  B. Gustavsen,et al.  Application of vector fitting to state equation representation of transformers for simulation of electromagnetic transients , 1998 .

[2]  Adam Semlyen,et al.  Practical transfer function estimation and its application to wide frequency range representation of transformers , 1993 .

[3]  Xiaoyu Yang,et al.  An overview of power transmission systems in China , 2010 .

[4]  R. T. Harrold.  The Spectrum Analyzer Applied to the Measurement of EHV Power Line Radio Noise , 1971 .

[5]  Jinliang He,et al.  Experimental study of transients and electrical fields caused by lightning flashover in the uhvdc converter station , 2014, 2014 International Conference on Lightning Protection (ICLP).

[6]  Yilu Liu,et al.  A computer program for HVDC converter station RF noise calculations , 1994 .

[7]  Bo Zhang,et al.  Mechanism of ±800 kV HVDC converter abnormal block fault caused by lightning transient , 2014 .

[8]  Christof Humpert,et al.  Long distance transmission systems for the future electricity supply – Analysis of possibilities and restrictions , 2012 .

[9]  Y. Liu,et al.  Measurement of the frequency dependent impedance of major station equipment , 1990 .

[10]  C. Paul.  Introduction to electromagnetic compatibility , 2005 .

[11]  B. W. Jakel,et al.  Electromagnetic environment near HVDC thyristor valves , 1999 .

[12]  Y. Liu,et al.  Modeling of converter transformers using frequency domain terminal impedance measurements , 1993 .

[13]  Jos Arrillaga,et al.  Power Systems Electromagnetic Transients Simulation , 2002 .

[14]  S. E. Wright,et al.  HDVC converter station tests in the 0.1 to 5 MHz frequency , 1988 .

[15]  Shuiming Chen,et al.  Simulation Analysis on Conducted EMD Caused by Valves in $\pm$ 800 kV UHVDC Converter Station , 2009, IEEE Transactions on Electromagnetic Compatibility.