Using battery management systems to augment inter-area oscillation control in wind-integrated power systems

This paper presents a control design for shaping the inter-area oscillations of a wind-integrated power system through coordination between a wind power controller and a controlled battery energy system (BES). We consider a continuum representation of the power system dynamics subject to two point source forcings from wind and battery power, each injected at specified electrical distances along the transfer path. The inter-area oscillation modes of a wind-integrated power system have previously been shown to be highly dependent on the location where wind power is injected, as a result of which a particular injection site may produce a desired spectral response. A wind power controller may be used to achieve the response in an arbitrary location but the effect is limited to small frequency ranges. In the present work, we design co-dependent linear controllers for the wind power and the BES in charging mode, and show that the addition of this controlled BES greatly improves the spectral matching within the inter-area oscillation range. We illustrate the performance of our controllers using power system models inspired by US west coast transfer paths such as the Pacific AC Inter-tie.