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access icon openaccess Influence of transition resistance and fault moment on DC system commutation process caused by two-phase fault of AC system

This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 04/09/2018, Accepted 19/09/2018, Published 23/10/2018

Commutation failure caused by the fault of AC system at inverter side seriously affects the safety and stability of high-voltage direct current (HVDC) system. Although two-phase fault is a typical asymmetrical fault, the studies on commutation failure caused by two-phase fault are few compared with the studies on commutation failure caused by three-phase fault or single-phase fault. In this study, the features of two-phase fault occurring on commutation bus is analysed theoretically. The analysis shows that the transition resistance will affect the amplitude and phase of the commutation voltage at Y-Y and Y-D1 transformer valve sides. Furthermore, the change regularity of the commutation voltage along with the change of transition resistance is given. Taking interphase short circuit as an example, the influence of different fault moments on commutation process is studied. For the first commutation process before the fault, the possible cases of commutation failure are given for fault moments in one cycle. For the first commutation process after the fault, a calculation method of critical voltage drop is given. Simulation results verify the correctness of the analysis.

Inspec keywords: power system stability; failure analysis; power transmission reliability; commutation; HVDC power transmission; power transformers; fault diagnosis; power transmission faults; invertors; safety systems

Other keywords: HVDC system safety; typical asymmetrical fault; DC system commutation process; single-phase fault; inverter; commutation voltage; Y-Y transformer valve; transition resistance; AC system; critical voltage drop calculation method; two-phase fault; Y-D1 transformer valve; HVDC system stability; commutation bus; three-phase fault; fault moments; interphase short circuit; high-voltage direct current system; commutation failure

Subjects: Power system control; DC-AC power convertors (invertors); Reliability; Plant engineering, maintenance and safety; Transformers and reactors; d.c. transmission

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