The voltage stability of the hybrid HVDC system based on the sensitivity analysis method

Combined with an HVDC transmission system closely, the voltage stability of the system is studied which is based on the sensitivity analysis method. First, a hybrid HVDC system sensitivity calculation method is deduced. On the basis of the method, the active and reactive power sensitivity matrix which is about the voltage amplitude of several AC transmission system important nodes to the DC channel and AC channel is calculated. The sensitivity matrix of the transmission active power and the absorbed reactive power of DC system is calculated under different control modes of DC system, as well as several important nodes voltage sensitivity under different control mode. Integrated the sensitivity indicators above, the operation control mode of AC/DC hybrid transmission system and the measures to improve the voltage stability are studied, providing the technical reference for the safe and stable operation of AC/DC hybrid transmission system.