Abstract
This paper proposes a new AC line pilot protection scheme for AC/DC hybrid system on the basis of composite mode power difference, which can avoid the incorrect operation of AC line protection resulting from commutation failure. By analyzing the post-fault conducting states of inverter valves, the expressions of injection current from DC system in different operating states of inverter are derived. And combining the fault network of AC system, the models to calculate the 0/1/2-mode power injected from the backside systems of AC line are built. Then, the 0-mode power and 2-mode power are used to construct the composite mode power difference. Considering that the composite mode power varies with system topology, this paper forms the protection criterion according to the composite mode power difference which is related with the difference between system models of the backside systems in internal and external fault cases. Simulations based on RT-LAB platform confirm that, the presented method can correctly distinguish between different types of internal and external faults, and it is highly immune to the fault resistance and commutation failure.
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