Abstract
Electric power converters are essential for process optimization and electric drives control. However, the presence of both DC and AC currents in the same circuit make difficult the diagnosis and protection of this type of systems. For this reason, a new ground fault location method for the controlled AC side is presented in this paper. It is based on a grounding resistor placed in the midpoint of the DC bus, where its voltage is measured simultaneously to the AC phase voltages. Applying a phasor operated equation, the phase where the fault is can be detected by angle comparison. Furthermore, an estimation of the fault location can be obtained. To corroborate the method, numerous simulations have been performed. The results show certain inaccuracy when the fault is near to the neutral of the system which is inconvenient since the phasor equation requires precise values. In contrast, the arc resistance nor AC phase current measurements in the fault location process are not needed. The effectiveness of the method makes the ground fault diagnosis in AC-DC systems practical and profitable.
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