A closed loop controller for voltage stability

Abstract Power system contingencies sometimes cause excessive reactive power imbalance even leading to total system breakdown. The problem is usually aggravated when the system is heavily loaded. By closely monitoring the overloaded lines, it is possible to avoid such major disturbances. A closed loop controller can steer the system to a safer state by rescheduling the generation and shedding the load, if necessary, to alleviate the overload. This results in a reduction of the risk of total system breakdown. A closed loop controller to this effect is designed. Broad details of the closed loop controller and its efficacy in avoiding total system breakdown are demonstrated with two examples on a simulated system.

[1]  Walter L. Snyder.  Var Management???Problem Recognition and Control , 1984, IEEE Power Engineering Review.

[2]  G. Brownell,et al.  Analysis and solutions for bulk system voltage instability , 1989, IEEE Computer Applications in Power.

[3]  W. R. Lachs.  Insecure System Reactive Power Balance Analysis and Counter Measures , 1985, IEEE Power Engineering Review.

[4]  Arun G. Phadke,et al.  Power system emergency control near voltage instability , 1989, Proceedings of the 28th IEEE Conference on Decision and Control,.

[5]  W. R. Lachs.  Dynamic Study of an Extreme System Reactive Power Deficit , 1985, IEEE Power Engineering Review.

[6]  J. Goossens.  Reactive Power and System Operation—Incipient Risk of Generator Constraints and Voltage Collapse , 1989 .

[7]  Danny Sutanto,et al.  Voltage instability in interconnected power systems: a simulation approach , 1992 .

[8]  Jung-Hoon Kim,et al.  Security Based Economic Operation of Electric Power System , 1989 .

[9]  N. Fukushima,et al.  Dynamic Simulation of a Power System Network for Dispatcher Training , 1982, IEEE Transactions on Power Apparatus and Systems.

[10]  Atteri Kuppurajulu,et al.  An Integrated Real-Time Closed-Loop Controller for Normal and Emergency Operation of Power Systems , 1986, IEEE Transactions on Power Systems.

[11]  Akihiko Yokoyama,et al.  Fast monitoring and optimal preventive control of voltage instability , 1994 .

[12]  Om P. Malik,et al.  An expert system for voltage and reactive power control of a power system , 1988 .

[13]  A. Kuppurajulu.  Closed loop reactive power control for use in energy management systems , 1990 .