Robust Design of Damping Controller for Power System using a combination of Flower Optimization algorithm and Optimal Control Theory

Niharika Agrawal Agrawal; Mamatha Gowda

Abstract

The power system experience low frequency oscillations due to various disturbances. It is verynecessary to damp these oscillations else it will endanger the system security and stability. High gainand fast acting excitation systems do not provide the necessary damping torque and it can provide thesufficient synchronising torque only. Lack of damping torque causes the oscillations of generator rotor,So, Power system stabilizer (PSS) is used in the proposed work along with excitation system. PSSprovide an additional signal to the input of excitation system. So, that an electrical torque is producedby the PSS in the generator which is proportional to rotor speed deviation. The gains of the PSS havebeen tuned by a novel flower optimization algorithm. The PSS is used in the system to improve thestability. The stability is further improved using optimal control theory and feedback gain k is passedto the system which ensures and guarantees the robustness of the system. Thus, the proposed work is acombination of flower optimization method and LQR based optimal control method for damping thelow frequency oscillations in the system.

Abstract

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