Abstract
This paper proposes a DC-bus signaling (DBS) method for autonomous power management in a DC microgrid, used to improve its reliability. Centralized power management systems require communication between the power sources and loads. However, the DBS method operates based on the common DC-bus voltage and does not require communication. Based on the DC-bus voltage band, the DC-bus voltage can be used to inform the status of the DC-bus in various scenarios. The DC microgrid operates independently to maintain the system stably in the DC-bus voltage band. The DC microgrid can be divided into a grid-connected mode and an islanding mode. This paper proposes a control strategy based on power management of various independent components in islanding mode. In addition, the autonomous control method for switching the converter’s operation between grid-connected mode and islanding mode is proposed. A DC microgrid test bed consisting of a grid-connected AC/DC converter, a bidirectional DC/DC converter, a renewable energy simulator, DC home appliances and a DC-bus protector is used to test the proposed control strategy. The proposed autonomous control strategy is experimentally verified using the DC microgrid test bed.
Highlights
Renewable energy sources such as photovoltaic (PV) cell and wind energy are being used to replace fossil fuels due to resource depletion and environmental issues such as pollution and climate change [1,2,3]
The bidirectional AC/DC converter connects the AC grid and DC microgrid, and all other converters are connected parallel to the DC microgrid, except the DC distribution panel board, which is series connected to the microgrid to distribute DC power to all the components
This paper proposes the autonomous DC microgrid operation to maintain the DC microgrid stably according to the AC grid status
Summary
Renewable energy sources such as photovoltaic (PV) cell and wind energy are being used to replace fossil fuels due to resource depletion and environmental issues such as pollution and climate change [1,2,3]. By configuring the DC-bus voltage in bands, all components that make up the DC microgrid can operate independently using power flow information It is cheaper and more reliable, because the DBS does not depend on a complex communication network. An improved DBS method is proposed in [16], the switching frequency modulation of a grid-connected DC/DC converter was utilized as the operating information for the power line communication This method requires additional component such as spectrum analyzer. The recovery control strategy for switching the operation of the converter between grid-connected mode and islanding mode using power line communication is proposed. The proposed power management algorithm in islanding mode and recovery control strategy using power line communication are implemented to verify the functionality and performance of the DBS method in the 380 V DC microgrid test bed system
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