Non-linear sliding mode control for frequency regulation with variable-speed wind turbine systems

Abstract

This paper presents a new control strategy to minimize mismatch between the generations and loads in the wind integrated power system. This in turn enhances the integration level smoothly and reduces frequency deviation in the system. The proposed control strategy is able to establish better dynamic response and provide better coordination between conventional two-area and wind power systems. The said objective is achieved by designing a non-linear sliding mode control in two-area thermal system, in addition with droop control and modified pitch angle control for wind generator to provide frequency support. The proposed controller has ability to vary closed-loop system damping property according to uncertainties and load disturbances and thus ensures asymptotic stability. The wind power output and frequency regulation remain insensitive to gusts, changes in wind speed and as well as inertia. Several simulations are performed on two-area with wind integration and IEEE 39 bus system to illustrate the effectiveness of the proposed controller design.