Abstract
With the increasing penetration of clean energy into the power grid year by year, the randomness and weak inertia brought by clean energy pose new challenges to the power grid to maintain frequency stability. In this paper, the load frequency control (LFC) model of a two-area interconnected power grid with battery energy storage system (BESS) is established. The power output constraint of battery energy storage is designed based on the state of charge (SOC), and the particle swarm optimization (PSO) algorithm is used to minimize the frequency regulation cost of energy storage. As the goal, an economical power distribution control strategy for battery energy storage is calculated. In addition, the fractional-order PID (FOPID) controller is used as the main controller of LFC. The simulation results indicate that the LFC scheme proposed in the paper has certain advantages on adjusting the system frequency deviation and saving the frequency regulation cost.
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