Influence of Synchronous Condenser on Voltage Stability of HVDC

The new type large capacity synchronous condensers are designed to satisfy the strong demand of dynamic reactive power support for the converter station of HVDC system. However, its operating characteristics have great difference with static reactive power compensation equipment. Therefore, it is very important to study the influence of synchronous condenser on the voltage stability of the HVDC system. In this paper, the dynamic operating characteristics of synchronous condenser connected to the rectifier station are studied during the voltage sag under the different transmitted active power and reactive power reserve of sending-end system. The voltage of AC-DC systems during the voltage sag are compared under the different conditions, respectively. The ability of synchronous condenser on maintaining voltage stability and transmitted active power of DC transmission systems is analyzed. The result of this paper can provide theoretical basis on synchronous condenser applying to converter station of HVDC systems.