A DC Bus Signaling Based Autonomous Power Management Strategy for a Grid-connected PV-Battery System

Management of multiple energy sources without implementation of extra communication is challenge. This paper presents an autonomous power management strategy for a grid-connected PV-battery system. The DC-bus signaling method is used to achieve the power line communications so that the system can switch from the different working modes. The experimental results validated that with the proposed control strategy, the overall system can transit automatically between the different operation modes according to the availability of renewable energy, SOC of the battery, and the load. Furthermore, using the BDC as a power decoupling circuit, the bus voltage ripple can be further reduced as well.