Power detection method of parallel inverter based on power sharing control

WANG Xing-gui， LI Jing， LI Xiao-ying
（College of Electrical and Information Engineering， Lanzhou University of Technology， Lanzhou 730050， China）

Abstract： Aiming at the problem that the parallel inverter system which based on power sharing control cannot accurately detect the power at light load due to the sensor precision issue which end up impacting on performance of the system，the power detection method was investigated in which the output current is replaced by inductance current. The traditional power detecting method and inductor current power detecting method were compared and analyzed，and the effect of inductor current power detecting method to power sharing control was also discussed. On the Matlab simulation platform，simulate comparing was performed between the detection results of the two sampling methods under the condition of power sharing control. The results indicate that the two detecting methods have same voltage regulation effect to the system when operated at rated load. While at light load，using inductor current power detecting method instead of output current power detecting method could reduce the effect of the sensor precision to the power detection system and improve the  inhibition effect of system circulation.
Key words： parallel inverter； power detection； power sharing control