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Method for Synchronizing Parallel Inverters

IP.com Disclosure Number: IPCOM000028014D
Publication Date: 2004-Apr-19
Document File: 1 page(s) / 44K

Publishing Venue

The IP.com Prior Art Database

Abstract

The method for synchronizing parallel inverters provides a means for synchronizing both switching frequency and reference frame angle of N paralleled 3 phase voltage source inverters. Voltage references are transmitted separately and each inverter operates independently, but synchronized to a master.

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Method for Synchronizing Parallel Inverters

The invention provides a means for synchronizing both switching frequency and reference frame angle of N paralleled 3 phase voltage source inverters. Voltage references are transmitted separately and each inverter operates independently, but synchronized to a master.

Previously we have transmitted actual gate commands from a master inverter to slave inverters to insure carrier frequency synchronization and a separate signal for angle orientation. Our previous techniques required more cabling between inverters and performance was not optimal since slave inverters did not independently regulate current.

The designated master inverter sends out a sync signal to slave inverters in a ring fashion and also broadcasts a synchronous reference frame voltage reference to slave inverters via a separate communications channel. Each inverter has a sync in and sync out line. The sync out from one inverter is connected to the sync in of the first inverter in line, forming a sync signal ring. If the ring ever breaks, the inverter with no sync input becomes the new master, allowing continued parallel operation in spite of the single inverter failure.

The advantage of this invention is reduced cabling between inverters and optimal performance since each inverter independently regulates current.