Multi-mode operation of Combined Cycle Gas Turbines with increasing wind penetration

As power systems evolve to incorporate greater
penetrations of variable renewables, the demand for flexibility
within the system is increased. Combined Cycle Gas Turbines
(CCGTs) are traditionally considered as inflexible units but those
which incorporate a steam bypass stack are capable of open-cycle
operation. Facilitating these units to operate in open-cycle mode
is shown to improve system reliability and reduce emissions. It
also yields benefits for the generators themselves via increased
revenues (in some circumstances) and reduced cycling.