Control Scheme for Bidirectional DC/DC Converter in PV-battery System based on Active Disturbance Rejection Control

Abstract

The increasing penetration of non-synchronous renewable generation is changing power system frequency performance, including its inertial response. In this paper, we argue that PV-battery systems owned by end users can be used as a source of fast frequency response, which can mitigate the impact of the reduced inertia. To that end, we propose a control scheme for the bidirectional DC/DC converter that is used to connect the battery to the DC-link capacitor to provide the energy needed for fast frequency response. The proposed scheme, based on active disturbance rejection control, avoids the external switching signal during mode switching and rejects the “total disturbance” of the system, thereby improving the response speed and enhancing the stability of the system. Simulation results are provided to verify the feasibility of the proposed scheme.