CONTROL METHOD OF PARALLEL CONNECTED MODULES OF UNINTERRUPTED POWER SOURCE Russian patent published in 2013 - IPC H02M7/493 H02M7/5395 G05F1/613 

FIELD: electricity.

SUBSTANCE: control method involves use of similar modules switched in control chains either to a drive or driven module modes; besides, in the drive module there used is additional feedback as to current of capacitors of output filters of modules. In case of failure of any of the modules, it is disconnected from load and the primary power network, and an operating mode of each module, if required, is changed by means of switches. In order to change over the driven module to the drive module operation, a signal is supplied to its input, which is obtained by switching an input chain from the setting signal of current to sine-shaped voltage signal, from which the connected signal of the main feedback as to voltage and total current signal of capacitors of output filters of modules is deducted. At the same time, a current signal of the drive module is connected to a common control bus of output current of the drive module. When an additional module is being introduced to an uninterrupted power source, first, it is set to a drive module mode, and then it is switched over to a driven module mode.

EFFECT: improving reliability of an uninterrupted power supply system with AC output and its scalability.

3 dwg