Energy function based security control and control actuator placement by sparse feedback design

This paper suggests a sparse feedback dynamic control scheme with unified power flow controller (UPFC) to prevent transmission system overload. An transient energy function (TEF) is developed to measure the security of the grid in dynamic. Firstly, a TEF are constructed based on AC dynamic model with transmission over-current tripping model. Then a power flows feedback control law is proposed to exploits the non-positive time derivative of the TEF with the accommodated admittance, to mitigate dynamic current violation. The accommodated admittance are obtained by TEF stability margin sensitivity analysis. With the proposed control method, the system can be driven to a stable state without current violation even if part of the UPFCs fails. Finally, the simulation results of 14 bus test case demonstrate the effectiveness, as well as the resilience of our proposed method.