Control strategy of bidirectional convertor in DC/AC hybrid microgrid

The AC/DC hybrid power supply system can not only provide power for DC loads, but also can supply AC power equipment, and can also reduce power electronic components to improve power quality. Therefore, it is suitable for using in new energy buildings. The bidirectional DC/AC converter is an important device for realizing the power exchange between the DC sub-microgrid and the AC sub-microgrid in an AC/DC hybrid microgrid, and it is also a key device for maintaining the stable operation of the hybrid microgrid. The relationship between power and voltage in the microgrid is in line with PU droop characteristics. This paper proposes an improved droop control strategy that determines the power shortage (excess) value based on the relationship between the DC side capacitance and the voltage across AC and DC and delivers the corresponding power accordingly. To ensure the power balance in the microgrid system and maintain the stability of the system.