Stability simulation analysis of a hybrid wind-battery system

Abstract

This paper focuses on the control of a hybrid wind-battery system. The mathematical model of dynamic behavior of the hybrid wind-battery system is established. We figure out there is inter-area low frequency oscillation caused by wind power fluctuation, and propose an approach for obtaining the sensitivities between eigenvalue changes and wind power fluctuation. Then a lithium-ion based battery energy storage model is designed to limit the damping active power associated with inter-area low frequency oscillation to reduce the electrical power oscillation, increase the damping and reinforce the dynamic stability of the systems. A simulation of small signal stability and forced power oscillation stability in two-area power system also shows the necessity of the hybrid windbattery system.