Patent ID: 8541904

Claim:
An energy conversion system comprising: a DC-link; a load coupled to the DC-link; and a first voltage converter configured to convert a first DC voltage from a first energy storage device into a second DC voltage based on a command signal and based on a first adjustment signal; a first bus voltage controller configured to: iterate calculation of the first adjustment signal based on the command signal; and communicate each iterated calculation of the first adjustment signal to the first voltage converter; a supervisory controller configured to: iterate calculation of the command signal based on the load and based on a desired DC-link voltage for the load; and communicate each iterated calculation of the command signal to the first voltage converter and to the first bus voltage controller; and wherein a frequency of the first bus voltage controller to communicate each iterated calculation of the first adjustment signal is higher than a frequency of the supervisory controller to communicate each iterated calculation of the command signal.