1. Real-time remedial action against aperiodic small signal rotor angle instability
- Author
-
Jacob Østergaard, Hjortur Johannsson, and Tilman Weckesser
- Subjects
IEEE standards ,Engineering ,Power, Energy and Industry Applications ,Electric generator ,Boundary (topology) ,02 engineering and technology ,Remedial actions ,Signal ,law.invention ,load dispatching ,IEEE 14-bus test system ,law ,power system stability ,0202 electrical engineering, electronic engineering, information engineering ,Rotors (windings) ,aperiodic small signal rotor angle instability ,Control methods ,Impedance ,Components, Circuits, Devices and Systems ,Steady-state ,rotors ,real-time remedial action ,power system security ,Aperiodic graph ,stability boundary monitoring ,Restoration ,Stability boundaries ,Stability ,power system generation redispatch ,Steady state (electronics) ,020209 energy ,Real-time operation ,Energy Engineering and Power Technology ,maximum steady state active power injection ,Instability ,Stability (probability) ,Rotor angle stability ,active power redispatch ,Control theory ,Electrical and Electronic Engineering ,Real-time systems ,Stable operation ,Impedance plane ,business.industry ,Stability analysis ,AC power ,Power system control ,Electric generators ,Generators ,Characteristic curve ,secure operation ,Security ,Nordic32 test system ,business ,remedial action schemes - Abstract
This paper presents a method that in real-time determines remedial actions, which restore stable operation with respect to aperiodic small signal rotor angle stability (ASSRAS) when insecure or unstable operation has been detected. An ASSRAS assessment method is used to monitor the stability boundary for each generator in real-time. The ASSRAS boundary represents the condition when a generator reaches the maximum steady state active power injection. The proposed control method exploits analytically derived expressions for the ASSRAS boundary and other characteristic curves in the injection impedance plane to determine an active power redispatch among selected generators to restore stable and secure operation. Since the method is purely based on analytically derived expression, the computation of the remedial actions is fast and well suited for real-time operation. The method was tested on the IEEE 14-bus and the Nordic32 test systems where results show that the method can efficiently determine the required active power redispatch to avoid an imminent instability.
- Published
- 2016