A synchronous condenser, also known as a synchronous capacitor or synchronous compensator, is a large, rotating, direct-driven, synchronous motor with its shaft mechanically coupled to an AC source of leading or lagging power factor correction. These machines are rotating stability! They work on the same principles as any other synchronous! They are not generally used to drive anymechanism and do not convert or supply mechanical power. Instead, theyare used in power transmission and distribution systems at a busbar of an electrical power system to either generate or absorb reactive power! They are mainly used for power factor correc! They can be overexcited, supplying reactive power (capacitive), or underexcited, absorbing reactive power (inductive). In the over! overexcited mode, it supplies reactive power like a capacitor bank, improving the power factor. In the underexcited mode! absorbs reactive power, much like an inductor, decreasing the power factor. The condensers help in stabilizing the power grid! and providing necessary! during system disturbances. They are often useas a fast response to system problems, helping to maintain stability when the system is subjected to! disturbances. They are frequently used in remote areas where static capacitors would be uneconomical (due to low ! loads) or ineffective (for! temperatures). They are usually a high m! rating, and their field windings are eithe! or separately excited.