US 11,791,745 B1
Adaptive control method for multiple inverters in parallel and system with multiple inverters in parallel
Hui Ma, Shenzhen (CN); Wentao Cang, Shenzhen (CN); Xiangzhu Yin, Shenzhen (CN); and Zhihua Guo, Shenzhen (CN)
Assigned to SHENZHEN POWEROAK NEWENER CO., LTD, Shenzhen (CN)
Filed by SHENZHEN POWEROAK NEWENER CO., LTD, Shenzhen (CN)
Filed on Apr. 26, 2023, as Appl. No. 18/307,087.
Claims priority of application No. 202210924527.8 (CN), filed on Aug. 3, 2022.
Int. Cl. H02M 7/493 (2007.01); H02J 3/48 (2006.01)
CPC H02M 7/493 (2013.01) [H02J 3/48 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An adaptive control method for multiple inverters in parallel, comprising:
acquiring state information output by a master inverter unit and a slave inverter unit;
calculating an active power output by each of the inverter units and an average active power according to the state information;
adjusting a reference voltage output by each of the inverter units according to a deviation between the active power output by each of the inverter units and the average active power;
based on the adjusted reference voltage, re-acquiring the state information output by each of the inverter units, and calculating a voltage component difference and a current component difference between the master inverter unit and the slave inverter unit;
adaptively adjusting the virtual impedance of the slave inverter unit according to the voltage component difference and the current component difference so that the output impedance of the slave inverter unit matches the output impedance of the master inverter unit;
wherein the equation for adjusting the reference voltage is:

OG Complex Work Unit Math
wherein U0 is a rated voltage amplitude, kpu is a ratio of the deviation, kiu is an integral coefficient of the deviation, Paverage is the average active power of the master inverter unit and the slave inverter unit, Pi is the output active power of each of the inverter units, and i=1,2.