Impact of redox flow battery and capacitive energy storage devices in performance enhancement of restructured AGC of a CCGT incorporated hydro-thermal system

This article presents the effect of redox flow battery (RFB) and capacitive energy storage (CES) devices in enhancing the automatic generation control of a combined cycle gas turbine (CCGT) incorporated hydro-thermal power system under realistic restructured scenario. Stochastic fractal search optimized integral minus proportional-derivative with first-order-filter (I-PDF) controller is employed as secondary control for both control areas along with unique control action of CCGT consisting of air-flow and temperature control. Performance comparison of integral, proportional-integral, proportional-integral-derivative and I-PDF controller in absence of RFB and CES establishes the superiority of later. Simulations are carried out for bilateral transactions to investigate the extent of damping oscillations considering the presence of four combinations of RFB and CES namely RFB and CES at both areas simultaneously, RFB/CES at areal/area2 with CES/RFB at area2/areal. Results infer that RFB located at both control areas damps out the oscillations better than the other three combinations.