Decentralized Integral Sliding Mode Approach for Frequency Control and Unknown Demand Reconstruction in Power Systems

Abstract

This paper deals with the design of a decentralized integral sliding mode approach to control the frequency in power systems partitioned into control areas. In this approach, the frequency and the total electrical active power exchanged are both locally measured in each area via Phasor Measurement Units (PMUs). A robust integral sliding mode control scheme with chattering alleviation is designed to steer to zero the frequency deviation in each control area. Furthermore, a method to locally reconstruct the unknown electrical active power demand is presented. The proposed method has the merit to be robust with respect to matched uncertainties and unmodeled dynamics in contrast to conventional control methods often based on linearized models. Numerical simulations are discussed to assess our approach.