Decentralized Nonlinear Control Using DSE & Normal Forms

In this chapter a nonlinear control scheme is presented for decentralized control of power system dynamics. The method uses an optimal control law, which has been derived in the general framework of nonlinear control using normal forms. This is done by first modeling the subtransient dynamics of power systems in a normal form and then deriving the optimal control law using the obtained normal form. Asymptotic stability of the whole system under the derived control has been proved. The control method utilizes dynamic state estimates as inputs. It is demonstrated using simulations on an example test system that the method can be used to ensure both transient stability and small signal stability of power systems.