Patent ID: 8179705

Claim:
A power subsystem comprising: a cooling system; a primary power converter; at least one secondary power converter operatively connected to the primary power converter; wherein the power subsystem is configured to measure: at least one cooling operating parameter of the cooling system; at least one primary operating parameter of the primary power converter; and at least one secondary operating parameter of the at least one secondary power converter; and a controller connected to the primary power converter, and to the at least one secondary converter, wherein the controller comprises: a memory unit configured to store a cooling power-loss model associated with the cooling system, a primary power-loss model associated with the primary power converter, and at least one secondary power-loss model associated with the at least one secondary power converter; a communications unit configured to receive the at least one cooling operating parameter, the at least one primary operating parameter and the at least one secondary operating parameter measured by the power subsystem and to send at least one control command to at least one of the cooling system, the primary power converter and the at least one secondary power converter; and a processor unit configured to: calculate a goal function from the cooling power-loss model, the primary power-loss model, the at least one secondary power-loss model, the at least one cooling operating parameter, the at least one primary operating parameter and the at least one secondary operating parameter; calculate a change of state of at least one of the cooling system, the primary power converter and the at least one secondary power converter such that the goal function is minimized; and generate the at least one control command based on the change of state; wherein the cooling system, the primary power converter and the at least one secondary power converter are configured to change their operating set points based on control commands received from the communications unit.