Enhanced battery controller for inertia support in residential microgrid based on active disturbance rejection control

Abstract

Lack of system inertia is becoming a big concern in modern power systems with a high penetration of inverter-interfaced generation. In this paper, we argue that PV-battery systems owned by end-users can be used as a source of inertia to improve the frequency performance of future grids. To that end, we implement grid-forming control on battery converters in a residential microgrid powered by prosumer-owned PV-battery systems and a back-up generator. To improve performance, we propose a novel controller based on active disturbance rejection control (ADRC). This controller observes and rejects the “total disturbance” of the system, thereby increasing the response speed and enhancing the stability of the system. In addition, we incorporate an adaptive parameter tuning algorithm into the ADRC controller, which automatically calculates and updates the optimal control parameters in every sampling period. Simulation results are provided to verify the effectiveness and feasibility of the proposed approach.