Short term active power support from DFIG with coordinated control of SSSC and SMES in restructured power system

Increasing wide spread use of wind power generation in power system continuously displaces synchronous generators. Variable speed wind turbines utilizing doubly fed induction generators (DFIG) are gaining prominence in power industry. Normally, DFIG does not offer any inertial response as its converter effectively decouples the inertia of DFIG from the system. Hence, the frequency control capability of the system gets deteriorated which results in higher rate of change of frequency following any load changes. With this assertion, the paper suggests frequency control function to have short term active power support from DFIG for frequency control of interconnected restructured power system. The presence of static synchronous series compensator (SSSC) in series with the tie-line and Superconducting Magnetic Energy Storage (SMES) at the terminal of one area further improves the area frequency responses for the PoolCo transactions. Different gains are optimized by particle swarm optimization to have optimal transient responses.