Fault Analysis of Inverter in Monopolar HVDC System

One of the different kinds of electrical energy is high voltage direct current (HVDC). Some previous researchers work on the Monopolar HVDC systems using Matlab/Simulink environment to carry out their analyses. The analyses that are carried out include single phase to ground fault, double phase to ground fault and three phase to ground fault. It is discovered, among others, that for single phase to ground fault on AC side of the inverter the three phase voltages and three phase currents show no effect except at the rectifier side. But it is clear in our present findings that with reference to single phase to ground fault, the three phase voltages have transient and oscillation waveforms that exclude phase A that decreases to zero and the three phase currents that have a high unstable waveform. We further show that the causes of increase in DC transmission line depend on the severity of the fault that is implemented at the inverter side. Therefore, transmission network is extremely important and engineers can use this result when doing their careful analyses.

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The authors declare no conflict of interest.

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The datasets used in this study are openly available at [repository link] and the source code is available on GitHub at [GitHub link].

This work did not receive any external funding.