Abstract
UHVDC converter station is the key position of UHVDC power system. Once lightning damage accident occurs, it may cause large-area power outage and have a very serious consequence. Therefore, UHVDC converter station requires reliable lightning protection measures. At present, the electrical distance between AC side arrester and protected equipment in UHVDC converter station has not been standardized. This paper will give the critical value of safe electrical distance between AC side arrester and protected equipment by simulation calculation. Firstly, the lightning intruding wave overvoltage level on the equipment on the AC side of UHVDC converter station under typical operation mode will be given by simulation. Secondly, the critical value of safety distance between AC side arrester and protected equipment of converter station will be studied and determined. Thirdly, for the condition that the distance between the AC side arrester and the protected equipment of UHVDC converter station exceeds the critical value of safety distance, the strengthening measures of lightning protection of UHVDC converter station are proposed. The research results will provide data support for the standardized layout of lightning arresters in UHVDC converter stations.
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