STATCOMPOWER AND ENERGY SYSTEM ENGINEERINGGOA ENGINEERING COLLEGE SHIVI ARORA

STATCOM(Static Synchronous Compensator)Variable Source Type Compensator

Possibility of generating controllable reactive power without the use of ac capacitors or reactors, by using switching power converters was disclosed by Gyugyi in 1976.

Similar to Synchronous Compensator.

Operation of STATCOMA STATCOM consists of a SVS that is supplied by a dc storage capacitor Cdc.

The SVS is connected in shunt with the ac system bus through a coupling transformer with a leakage reactance of XT.

V-I characteristic of a STATCOM

Static Synchronous GeneratorPure reactive injection or absorption is neither possible nor desirable.The dc capacitor voltage can be regulated by replenishing the losses due to switching and in the coupling transformer circuit by drawing power from the ac system.Therefore must lag by a small amount such that the dc capacitor voltage is held constant.

Indirect control

via control of DC capacitor voltageThat in turn is controlled by controlling the angle of output voltage

Direct control

PWMAngle control

Tyristor-based versus Converter-based Controller

Instantaneous control of STATCOM