Flexibility Assessment of Virtual Power Plant with Considering Dispatchable Wind Turbine

Nowadays, the uncertainty in the power system parameters has led to more operator flexibility requirements. Flexibility is the system’s capability to manage uncertainties and balance the supply-load equilibrium. This study presents an optimal operation model of distributed generation resources to supply electrical and thermal load as a virtual power plant for participating in the electricity market. Normalized up-ward and down-ward flexibility indices (FI) are expressed for demand response programs, conventional generators, and energy storage systems. Additionally, by assigning weights to each of the above indices, the up-ward and down-ward FI of the whole system has been calculated. The model has been evaluated on the standard 33-busses IEEE distribution system. The results show that the suggested flexibility model accurately quantifies the flexibility of the system, giving the system operator an adequate view of the system’s hourly flexibility.