SimPowerSystems

AC Line-to-Ground Fault at the Rectifier

Now you modify the timer blocks in order to apply a line-to-ground fault. In the DC Fault Timer and Forced Delay blocks of psbhvdc12pulse, change the multiplication factor of 1 in the Transition Times to 100, so that the DC fault is now eliminated. In the AC Fault Timer block, change the multiplication factor in the transition times to 1, so that a six-cycle line-to-ground fault is now applied at the rectifier. Restart the simulation.

Figure 2-35: Rectifier, Inverter Signals for an AC Line Fault on Rectifier Side

Figure 2-36: Voltages and Currents on the 60 Hz Side for an AC Line Fault on the Rectifier Side

Notice the 120 Hz oscillations in the DC voltage and currents during the fault. When the fault is cleared at t = 0.7 s, the VDCOL operates and reduces the reference current to 0.3 p.u. The system recovers in approximately 0.4 s after fault clearing.

References

[1] Arrilaga, J., High Voltage Direct Current Transmission, IEEE Power Engineering Series 6, Peter Peregrinus, Ltd., 1983.

[2] Electromagnetic Transients Program (EMTP), Workbook IV (TACS), EL-4651, Volume 4, Electric Power Research Institute, 1989.

DC Line Fault

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