AC/DC/AC converters

DC converters

energy storage and their converters are combined through a common DC bus to form the topology of power router which has two AC ports and three DC ports. Then

the typical operation modes are analyzed and the coordinated control strategy of AC/DC hybrid power router based on energy storage stabilizing voltage and virtual motor is proposed. Under the mode of single or double AC ports connecting to the grid

the power flow of two AC-DC converters are controlled by the power outer loop of virtual motor

while the DC voltage keeps steady due to energy storage. When both the AC ports are off-grid

not only keeps the DC voltage stable

but also supplies for AC and DC loads. The proposed strategy reduces the complexity of device control without mode switching. The stability of DC voltage is achieved in each operation mode

and the distributed generation is accommodated by local loads

and the constant and stable power supply for AC and DC load is ensured. Moreover

the flexible interconnection between the feeder lines of the distribution network is realized

and the power flows are transferred when the power grid fails

while the self-stable operation is realized when both the AC ports are off-grid

which effectively improves the power supply reliability of the low-voltage distribution network. Finally

the correctness and effectiveness of the proposed coordinated control strategy are verified by simulation and experiments.