![]() ![]() Hence, the torsional vibration of the coupled rotor on coupling elements is compared for the controlled and uncontrolled scenarios. The coupling elements of the turbine and generator are most susceptible to shear failure. The coupled equations are solved in MATLAB using the Newmark‐beta integration method. The finite element (FE) method is used to model the rotor elements. The variation in the electromagnetic torque of the synchronous generator during various electrical faults is evaluated using a dq0 model. Proportional and velocity feedback is used as a control law. In this paper, a theoretical study is performed to control the torsional vibration of a turbo‐generator rotor using a piezoelectric material, namely a polyvinylidene fluoride (PVDF) layer, as a sensor and actuator. Reduction in the torsional vibration of heavy rotors (eg, turbo‐generator rotors) is important for the safe and efficient functioning of the power plant. The proposed method yields 0.011% shaft fatigue life loss under the most adverse islanding condition against 100% obtained with an online monitoring and protection system (OMPS). Islanding on the local load is allowed when the actual shaft torque is smaller than the critical torque. The turbine generator is shut down when the actual shaft torque during islanding exceeds the critical torque. The risk of shaft fatigue damage is predicted by comparing the actual shaft torque with the critical torque. This is substituted in the torque function to obtain the critical torque. Fatigue study determines the local load size required to mitigate shaft torsional vibrations and avoid fatigue life loss during islanding. Induced transient torque is first modeled. The method is based on predicting the risk of shaft fatigue damage. Therefore, a protection method is proposed in this work. Transient torques induced at the moments of islanding and removing the utility load from the island may cause shaft fatigue life loss and lead to fatigue damage. Interconnection standards recommend removing the utility load from the island. A distributed generation steam turbine generator (hereafter referred to as turbine generator) improves the supply reliability of the local load when operated as a backup supply during islanding. ![]()
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January 2023
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