Title :
A study on the nonlinear controller to prevent unstable Hopf bifurcation
Author :
Sang-Ho Lee ; Park, Jong-Keun ; Lee, Byung-Ha
Author_Institution :
Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
A model of a power system with load dynamics is studied by investigating qualitative changes in its behavior as the reactive power demand at a load bus is increased. The load is composed of induction motors in parallel with the constant power and constant impedance load. The response of the system undergoes various bifurcations such as subcritical and supercritical Hopf, period-doubling and saddle-node bifurcations as the load increased. The latter may lead the system to voltage collapse. A nonlinear controller is used to control the subcritical Hopf bifurcation and hence mitigate voltage collapse and is applied to KEPCO (Korean Electric Power Company) system to show its validity.
Keywords :
control system analysis; control system synthesis; induction motors; load (electric); nonlinear control systems; power system control; power system dynamic stability; Korea; control design; control simulation; induction motors; load bus; load dynamics; period-doubling bifurcation; power system nonlinear controller; reactive power demand; saddle-node bifurcation; unstable Hopf bifurcation prevention; voltage collapse mitigation; Bifurcation; Control systems; Impedance; Induction motors; Nonlinear control systems; Nonlinear dynamical systems; Power system dynamics; Power system modeling; Reactive power; Voltage control;
Conference_Titel :
Power Engineering Society Summer Meeting, 2001
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-7173-9
DOI :
10.1109/PESS.2001.970189