Abstract
This paper proposes a decentralized nonlinear synergetic governor controller (NSGC) for turbine generators to enhance power system stability by using synergetic control theory and the feedback linearization technique. The precise feedback linearization model of a turbine-generator with a steam valve control is obtained, at first, by using a feedback linearization technique. Then based on this model, a manifold is defined as a linear combination of the deviation of the rotor angle, speed deviation, and speed derivative. The control law of the proposed NSGC is deduced and the stability condition of the whole closed-loop system is subsequently analyzed. According to the requirement of the primary frequency regulation, an additional proportional integral (PI) controller is designed to dynamically track the steady-state value of the rotor angle. Case studies are undertaken based on a single-machine infinite-bus system and the New England system, respectively. Simulation results show that the proposed NSGC can suppress the power oscillations and improve transient stability more effectively in comparison with the conventional proportional-integral-derivative (PID) governor controller. Moreover, the proposed NSGC is robust to the variations of the system operating conditions.
Highlights
Maintaining the stability of the power system under various disturbances is one of the critical issues of concern for the power operators, especially for the power system integration of bulk renewable energy [1,2,3,4,5,6,7]
The rotor angle reaches its new steady value smoothly under the control of the nonlinear synergetic governor controller (NSGC), while there is an obvious oscillation under the control of PID governor
It can be seen that the macro-variable decays quickly after the disturbance occurs and due to the rotor angle reference adjustment by the proportional integral (PI) regulator, it maintains a smaller value until the system approaches the equilibrium point
Summary
Maintaining the stability of the power system under various disturbances is one of the critical issues of concern for the power operators, especially for the power system integration of bulk renewable energy [1,2,3,4,5,6,7]. In [22], an optimal robust governor is designed by taking into account uncertainties explicitly caused by the nonlinear characteristics of the turbine This approach will guarantee the stability and the performance of the speed control loop for the entire turbine operating range. Training a network to handle the parameter changes not encountered a priori requires time These nonlinear controllers for turbine governors can suppress the oscillation and improve the system stability, but most of them only consider the speed adjustment regardless of the power regulation. A nonlinear synergetic governor controller (NSGC) for turbine generators is proposed to enhance power system stability by using synergetic control theory and the feedback linearization technique. Case studies are undertaken based on a single-machine infinite-bus system and the New England system to verify the effectiveness of the propose NSGC, respectively
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