Method and system for synchronizing the phase angles of parallel connected inverters

摘要

A method for transmitting phase angle information between inverters in a parallel connected inverter system to synchronise the phase angles of the inverters includes transmitting a common phase angle signal to server inverters (42b-42n). The common phase angle signal is a function of the phase angle of a master inverter. The common phase angle signal is indicative of the absolute phase angle of the master inverter (42a) when the phase angle of the master inverter is equal to a phase angle value associated with a new phase cycle. The common phase angle signal is indicative of an incremental phase angle change of the phase angle of the master inverter in a given time period while the phase angle of the master inverter (42a) is different from the value associated with a new phase cycle. The server inverters (42b-42n) control their phase angles in accordance with the common phase angle signal such that the phase angles of the master inverter and the server inverters are synchronised.