Damping of synchronous generator by static reactive power compensator with digital controller

A static reactive power (VAr) compensator (SVC), constructed by fixed capacitors (FC) snd thyristor controlled reactors (TCRs), is designed and implemented to improve the damping of the synchronous generator. A digital propotional-integral (PI) controller is synthesised by the Motorola M68HC11 single chip microprocessor board to modify the reactive power compensation of the SVC from adjusting the conduction angle of the thyristors. The SVC is placed at the generator bus terminal with the speed deviation (Δω) as the feedback signal for the PI controller. The pole assignment method is used to determine the gains of the PI controller. Results from digital simulation and the implementation test show that the SVC with the PI controller can greatly enhance the damping of the system oscillation caused by disturbances. Although the PI controller is designed at a special operation point, it can also provide a good damping effect at other operation conditions. The voltage profile of the generator is also improved by the SVC.

[1]  H. A. Luther,et al.  Applied numerical methods , 1969 .

[2]  Gerard Ledwich,et al.  Static reactive-power compensator controls for improved system stability , 1987 .

[3]  Timothy J. E. Miller,et al.  Reactive Power Control In Electric Systems , 1982 .

[4]  A. Y. Chikhani,et al.  An Expert Microprocessor Controlled Voltage Regulator for Energy Conservation and Demand Reduction in Distribution Feeders , 1989, IEEE Power Engineering Review.

[5]  S. S. Choi,et al.  Performance testing of a long distance radial static VAr compensated transmission system and validation of simulation results , 1988 .

[6]  A. Takeuchi,et al.  A digital distance relay using negative sequence current , 1990 .

[7]  H. Happ.  Power system control and stability , 1979, Proceedings of the IEEE.

[8]  M. D. Cox,et al.  A New Static Var Compensator for an Arc Furnace , 1986, IEEE Transactions on Power Systems.

[9]  G. J. Lipovski.  Single- and multiple-chip microcomputer interfacing , 1987 .

[10]  Chin E. Lin,et al.  Optimal control of a static VAR compensator for minimization of line loss , 1988 .

[11]  T. Sawa,et al.  A Field Test of Power Swing Damping by Static Var Compensator , 1989, IEEE Power Engineering Review.

[12]  Gerard Ledwich,et al.  Placement of static compensators for stability improvement , 1985 .

[13]  R. W. Menzies,et al.  Individual Phase Control of a Static Compensator for Load Compensation and Voltage Balancing and Regulation , 1987, IEEE Power Engineering Review.

[14]  James T. Lancaster,et al.  Semi-Automatic Meter Reading , 1987, IEEE Transactions on Power Delivery.

[15]  A. Hammad,et al.  Prevention of Transient Voltage Instabilities Due to Induction Motor Loads by Static VAR Compensators , 1989, IEEE Power Engineering Review.

[16]  Donald A. Pierre.  Nonlinear VAr control for damping multivariable swing equations , 1988 .

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

[18]  L. Gerin-Lajoie,et al.  Hydro-Quebec multiple SVC application control stability study , 1990 .

[19]  L. Gyugyi,et al.  Principles and Applications of Static, Thyristor-Controlled Shunt Compensators , 1978, IEEE Transactions on Power Apparatus and Systems.

[20]  Thomas Kailath,et al.  Linear Systems , 1980 .