Abstract
With increasing PV power penetration in the modern power grid, a cost-effective solution to address PV intermittency becomes more and more compelling. The ramp rate of PV power can reach 60% of its rated capacity in just 30 seconds. Energy storage is a technically feasible solution to suppress the adverse impacts of injecting intermittent power output with such a high ramp rate into the grid, but its cost is very high. Therefore, to reduce the system cost of integrating PV and maximize the grid operation profit, optimal sizing of energy storage is necessary. In this paper, a method of optimizing energy storage size for controlling PV ramp rate is presented. The characteristics of PV ramp rate are first investigated. Based on the results, an energy dispatch model for controlling PV ramp rate with fast response energy storage is developed. The optimal size of energy storage which minimizes system operation cost to accommodate high PV penetration is subsequently determined.
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