Nonlinear disturbance attenuation controller for turbo-generators in power systems via recursive design

The paper proposes a nonlinear robust controller for steam governor control in power systems. Based on dissipation theory, an innovative recursive design method is presented to construct the storage function of single machine infinite bus (SMIB) and multi-machine power systems. Furthermore, the nonlinear L₂-gain disturbance attenuation control strategy is achieved for speed governor control of turbo-generators without requiring the solution of an HJI inequality. With multi-machine power system control, all the variables in the control law are only relevant to the state variables of the local generator, thus a decentralized control strategy is achieved. Simulation results of a 4-machine system show that the controller can enhance power transient stability and dynamic performance.