Details

Autor(en) / Beteiligte

• Xiao, Pan
• Li, Peng
• Yan, Bo
• Pu, Ziheng
• Wu, Tian
• Fang, Chunhua
• Wang, Yu

Titel

Study on fault mechanism of LCCHVDC large disturbances under cloud-to-ground lightning with long continuous current

Ist Teil von

• Electric power systems research, 2022-12, Vol.213, Article 108790

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •A 500kV LCCHVDC lightning strike calculation model considering the long continuous current is first built.•Analyze the process of the commutation failure under the action of the lightning disturbance with long continuous current.•The blocking mechanism of HVDC transmission line under the lightning fault with long continuous current is studied. The safe and stable operation of the line commutated converter high voltage direct current (LCCHVDC) system is of great significance to the reliability of electricity supply. In order to clearly reveal the mechanism of LCCHVDC large disturbance fault under the Cloud-to-Ground (C-G) lightning with long continuous current, the HVDC-lightning simulation model considering long continuous current, actual control and protection systems is proposed. The effect of long continuous current on traveling wave protection is analyzed. Transient processes including commutation failure (CF), fault restart and blocking of the DC system under the lighting with long continuous current are simulated. The reasons for CF of LCCHVDC system caused by long continuous current are analyzed, and the influence of long continuous current amplitude and duration on fault restart process is studied. Results show that the long continuous current has little influence on the response characteristics of travelling wave protection, but during the regulation process of control system under lightning disturbance, the DC current control regulation quantity will increase due to the presence of long continuous current. If the amplitude of long continuous current exceeds 80 A, the CF will occur in the DC system. If the duration of long continuous current exceeds the deionization time, the line will fail to restart, and the line can be successfully restarted only if the long continuous current is over before the voltage begins to rise.