Failure analysis method based on phase change two-phase short circuit fault HVDC inverter side

The present invention provides a two-phase short circuit fault based transducer HVDC inverter side phase failure analysis method of the two-phase phase short circuit fault occurs in the inverter side of the bus, through the two-phase short circuit fault impedance, the two-phase short circuit fault, valve side line voltage when four two-phase short circuit fault impedance to ground via the two-phase short circuit fault, etc., i.e. commutation voltage, calculated changes in detail with respect to normal operating conditions the amplitude and phase of each of various fault line voltage calculated a converter transformer connected in different valve side a, b, and c-phase inverter shutdown valve angle, the conclusion that the influence of the two-phase short circuit fault commutation failure. The calculated extinction angle, although not accurately reflect whether the converter valve commutation failure occurs, but failed to prevent the phase change is still a certain significance.