Abstract
Power generated by wind turbines changes due to variation in wind speed that is independent of the load power. Rechargeable batteries could be used as a reserve power source to alleviate unbalance between the load power and power generated by wind turbines. A supervisory controller is proposed for an integrated wind turbine-battery system (wind turbine electrically connected to a rechargeable battery). The switching conditions for wind turbine controller operating in multi-input and single-input control modes are discussed. Stability of the wind turbine controller switching between the two modes is analyzed using linearized, open-loop approximation of wind turbine dynamics at the switching instants. A Common Quadratic Lyapunov Function (CQLF) is established for both control modes to prove the system stability. Simulation results demonstrating system stability are also discussed.
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