When a short-circuit fault between phases a-b occurs in the inverter-side converter bus, the bus voltage decreases, and the DC voltage then decreases to close to 0, resulting in a rise in the
An in-depth analysis is made on the frequent commutation failure of ±800kV UHVDC power transmission project in the initial operation stage. The investigation shows that
The results of many existing research have shown that the main causes of commutation failure are the commutation bus voltage amplitude drop or phase deviation
Hence, when the converter valve of the inverter is short-circuited or firing pulse is lost and various short-circuit faults occur in the AC system on the inverter side, commutation failure would result.
A novel method is developed to assess the commutation failure risk. In the multi-infeed HVDC system, the interaction between inverter stations is an important factor that
This paper analyzes the influence of voltage amplitude reduction, zero-crossing displacement, and volt-age waveform distortion on the commutation process based on the phenomenon of
Since the DC voltage is zero during a period following the commutation failure, no active power will be transmitted during this time. The system recovers in approximately 0.45s after...
Commutation failures are very frequent dynamic events in high voltage dc (HVDC) transmission systems. Commutation failure is mostly observed at the inverter side of HVDC links, where
In this paper we investigate the behavior of the HVDC inverter following three phases AC fault to ground. The model is implemented in the Digital Real Time Simulator (DRTS) Hypersim
The proposed commutation failure suppression method based on the dynamic tracking of the turn-off angle setting compares the expected DC voltage with the actual DC
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