METHOD AND SYSTEM FOR SYNCHRONIZING PHASE ANGLE OF INVERTERS BEING CONNECTED IN PARALLEL

摘要

PROBLEM TO BE SOLVED: To provide a method and system for transmitting phase angle information between inverters to synchronize the phase angle of the inverters in an inverter system where the inverters are connected in parallel. SOLUTION: This method has a process for transmitting a common phase angle signal to each server inverter. The common phase angle signal is the function of the phase angle of a master inverter. When the phase angle of the master inverter is equal to the value of the phase angle being related to a new phase period, the common phase angle signal indicates the absolute phase angle of the master inverter. When the phase angle of the master inverter differs from a value that is related to the new phase period, the common phase angle signal indicates the amount of increase in the phase angle within a specific period in the phase angle of the master inverter. The server inverter controls the own phase angle according to the common phase angle signal so that the master inverter is synchronized to the own phase angle.