Multiple UPS system having multi-way power tie system and intelligent power sharing control
AssigneeLiebert Corporation
InventorsXian Chen, Brian P. Heber
Life of this patent
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Abstract
A multiple UPS system includes a plurality of multi-module UPS subsystems coupled to a power tie cabinet, each multi-module UPS subsystem having a plurality of UPS modules. The power tie cabinet includes one or more controllers, collectively referred to as PTC (power tie cabinet) controls. The PTC controls periodically determine a power error message for each of the multi-module UPS subsystems and pass it to the respective multi-module UPS subsystem. A controller of the multi-module UPS subsystem uses the power error message to determine error data that is provided to a power average control loop used in control of power sharing among the UPS modules of the multi-module UPS subsystem.
Claims10
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.
A multiple uninterruptible power supply (UPS) system, comprising:
- 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 (PTC) controls, the PTC controls periodically determining a power error message for each multi-module UPS subsystem and passing it to a controller of that multi-module UPS subsystem;
- and
- the controller of each multi-module UPS subsystem using 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 which is used by the average power sharing control loop for each UPS module for average power control.
Dependencies are inferred from the claim text.