Impact of Fire-Through and Misfire in Rectifier Valves on a Turbine Generator Neighboring to a HVDC Inverter Station

In general, a fault that is far away from a generator would not cause serious impact to the generator. However, it is not the case for a generator in a HVDC system. For a HVDC link, the rectifier end is usually in several hundreds of kilometer away from the inverter end. It is found in this paper that both the fire-through and misfire faults happened in the rectifier valves may still make a serious impact on the inverter side generators. However, the impacting phenomena are different. A sustained fire-through fault happened in rectifier valves may induce the torsional interaction between the HVDC link and a nearby turbine generator in inverter end. This provides the chance for an electromechanical resonance to build up. A misfire fault happened in a rectifier valve could induce a non-negligible transient power disturbance on a turbine generator neighboring to the HVDC inverter station. The disturbing frequencies will be non-characteristic for the generator. On occasion of any of the torsional modes of the turbine generator are invaded, the torsional torque amplification effect would be significant.

並列關鍵字

HVDC Link ； turbine generator ； fire-through ； misfire

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