Suppression of Low Frequency Oscillation by Optimal Mechanical Steam-Turbine Controller

Oscillations in power system aggravations day by day with uncertainty in load variations and disturbances such as renewable penetrations. The present study proposes deployment of steam governors to supper oscillations in power system. The steam governor is equipped with fractional compensated lead lag action, where the gains are set by improved salp swarm algorithm (ISSA). The ITAE based objective function being considered with the remote signal speed deviation of generator taken as input for controller action. Sudden and discrete variations in reference voltage to generator, load and plug in electric vehicles (PEV) have been the source of low frequency oscillations and proposed steam governor being employed to suppress these oscillations. The tunning efficacy of ISSA has been contrasted with PSO and SSA techniques. The variations in speed have been analyzed for different disturbances with system eigen distributions and justification of proposed action has been established. Low frequency modelling of power system along with steam governor has been taken at an initial operating state. Time domain simulations have been carried out to analyses system behavior and it has been observed that proposed approach is much effective to oscillation suppression in power system.