A new control strategy of realistic power system for reactive power tracking and preserving of active power for turbo-generator based on OFOPID

This paper presents a new control strategy for tracking the reactive power demand (RPD) from the turbo generator system at the infinite bus, while maintaining constant active power demand (APD). The positive and negative disturbances of RPD are applied by ±10 % of 0.6 pu while APD is applied at 0.8 pu. The tracking of RPD and APD depends on a new mathematical model to control simultaneously both of the governor valve position and the exciter field voltage by four gain parameters (G_P1, G_P2, G_P3 and G_P4). These parameters will be found applying the bus admittance matrix model. To improve the system dynamics, 10th parameters of two fractional order PID (FOPID) controllers are optimized (OFOPID) by particle swarm optimization (PSO). The simulations revealed that the settling time, rise time, overshoot and undershoot could be reduced to a smaller value than the recently published researches. The voltage level has been regulated at the generator terminals by ±1.3 % while its settling time is 0.15 s and preserving the generator frequency at the nominal value with an overshoot of ±0.0046 Hz. So, the proposed method is significantly improved and highly effective as compared to previous related works.