Discrete-time model reference adaptive regulation of nodal voltage amplitude in power systems
Power Plants and Power Systems Control, Volume # 5 | Part# 1
Fusco, Giuseppe; Russo, Mario
Digital Object Identifier (DOI)
power system voltages,discrete-time systems,model-reference adaptive control,gradient method
This paper deals with the problem to regulate the nodal voltage amplitude in electrical power systems. A discrete-time linear model that embeds an unknown bias representing the no-load voltage is adopted to describe the power system dynamics. Due to the unpredictable and unknown variations of the power system normal operating points the model parameters are unknown and time-varying. To ensure that the controller exhibits the required performance even in presence of a such variations, the controller parameters are varied according to adaptive laws. These laws are developed on the basis of a gradient approach to minimize the squared augmented error. The properties of the designed adaptive laws are studied employing Lyapunov analysis. The results of numerical simulation are reported to validate the proposed design.
 Berizzi, A., P. Marannino, M. Merlo, M. Pozzi and F. Zanellini (2004). Steady-state and dynamic approaches for the evaluation of loadability margins in the presence of secondary voltage regulation. IEEE Transactions on Power Systems 19, 1048-1057.  Choi, J.-H and J. C. Kim (2001). The online voltage control of ultc transformer for distribution voltage regulation. Electrical Power and Energy Systems 23, 91-98.  Cigre, Tf (1992). Voltage and reactive power control . Paris, France.  Corsi, S., M. Pozzi, C. Sabelli and A. Serrani (2004). The coordinated automatic voltage control of the italian transmission grid - part i: Reasons of the choice and overview of the consolidated hierarchical system. IEEE Transactions on Power Systems 19, 1723- 1732.  Fusco, G., A. Losi and M. Russo (2001). Adaptive voltage regulator design for static var systems. Control Engineering Practice 9, 759- 767.  Fusco, G. and M. Russo (2005). Nodal voltage regulation employing an indirect self-tuning approach. IEEE Proc. Conference on Control and Applications pp. 797-802.  IEEE Working Group, Special Stability Controls (1994). Static var compensator models for power flow and dynamic performance simulation. IEEE Transactions on Power Systems 9, 229-240.  Kundur, P. (1994). Power system stability and control. McGraw-Hill, Inc. New York, USA.  O'Brien, M. and G. Ledwich (1987). Static reactive-power compensator controls for improved system stability. IEE Proceedings Pt. C 134, 38-42.  Rao, P., M. L. Crow and Z. Yang (2000). Statcom control for power system voltage control applications. IEEE Transactions on Power Delivery 15, 1311-1317.  Åström, K. J. and B. Wittenmark (1989). Adaptive control. Addison-Wesley Publishing Company, New York, USA.  Saied, M. M. (2001). The global voltage regulation: a suggested measure for the supply quality in distribution network. Electrical Power and Energy Systems 23, 427-434.  Sauer, P. and M. Pai (1998). Power system dynamics and stability. Englewood Cliffs, New York: Prentice Hall, USA.  Soós, A. and O. P. Malik O. P. (2001). An h
2optimal adaptive power system stabilizer. IEEE Transactions on Energy Conversion pp. 143- 149.  Tao, G. (2003). Adaptive control design and analysis . John Wiley & Sons, New York, USA.