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The ground return current of a high voltage direct current system will intrude the transformers adjacent to the grounding electrode in the case of monopole operation, leading to the half-cycle saturation of transformers. To mitigate the adverse effect, placing dc blocking devices (BDs) in transformer neutrals is popularly advocated. The conventional switching method of BDs may redirect the dc flow...
Base on the consideration of system reliability, HVDC control and protect system and other larger industrial control systems tend to use redundant dual network communications channels network architecture. The difficulty of this communications architecture are the selection the correct channel as the main working channel to transmit process data, fault detection of the working network channel and...
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