As reactive power compensation equipment

synchronous condenser is widely installed in ultra high voltage direct current（ UHVDC） project

which can effectively solve the problem of insufficient reactive power support capability of the power system. Firstly

this paper systematically analyzes the mathematical model of the synchronous condenser

and summarizes the electrical parameters which affect the dynamic performance optimization of the synchronous condenser. The good reactive power output characteristics of synchronous condenser are verified by simulation analysis and practical engineering application effect. Then synchronous condenser is compared with other reactive power compensation equipment

and the results show that the synchronous condenser has stronger transient voltage regulation and dynamic voltage support ability. On this basis

the existing reactive voltage control of synchronous condense are described in detail

and the pros and cons of control methods are analyzed. Finally

the key technologies that need to be studied in the future development of synchronous condenser are discussed based on the current grid requirements for synchronous condenser.