Patent ID: 9431854
Filing Date: 2016-08-30
CPC Classification: H02J

Claim Text:
1. A method of power sharing control in a multiple uninterruptible power supply (UPS) system having a plurality of multi-module UPS subsystems coupled to a power tie cabinet, each multi-module UPS subsystem having a plurality of UPS modules, each UPS module having a controller having a droop power sharing control loop and an average power sharing control loop, the power tie cabinet including power tie cabinet controls (PTC) controls, the method comprising: periodically determining with the PTC controls a power error message for each multi-module UPS subsystem and passing it to a controller of that multi-module UPS subsystem; and having the controller of each multi-module UPS subsystem use the power error message received from the PTC controls to determine power error data that it provides to the average power sharing control loop of the controller of each UPS module in that multi-module UPS subsystem and having the average power sharing control loop for each UPS module use the power error data for average power control.