US 8,541,904 B2 · Apparatus and system for power conversion

Abstract

An apparatus includes a DC-link, a voltage converter, a bus voltage controller, and a supervisory controller. The voltage converter is configured to convert a first DC voltage into a second DC voltage based on a command signal and based on an adjustment signal and to supply the second DC voltage to the DC-link. The bus voltage controller is configured to iterate calculation of the adjustment signal to communicate each iterated calculation of the adjustment signal to the voltage converter. The supervisory controller is configured to iterate calculation of the command signal and to communicate each iterated calculation of the command signal to the voltage converter and to the bus voltage controller. A frequency of the bus voltage controller to communicate each iterated calculation of the adjustment signal is higher than a frequency of the supervisory controller to communicate each iterated calculation of the command signal.

Claims20

Dependent claims

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.

11 more elements

An apparatus comprising:

a voltage bus;
a voltage converter configured to convert energy from an energy storage device into a voltage bus voltage;
a supervisory controller programmed to iteratively calculate a control signal configured to cause the voltage converter to convert the energy from the energy storage device into the voltage bus voltage;
a voltage bus controller programmed to:
receive a voltage feedback from the voltage bus;
receive the control signal from the supervisory controller;
calculate a desired voltage bus voltage based on the control signal;
determine if the voltage feedback is within a threshold of the desired voltage bus voltage;
and
if the voltage feedback is outside of the threshold of the desired voltage bus voltage, calculate a regulatory setpoint signal configured to cause the voltage converter to adjust the conversion of the energy from the energy storage device;
and
wherein a bandwidth of the voltage bus controller to calculate the regulatory setpoint signal is higher than a bandwidth of the supervisory controller to iteratively calculate the control signal.

9 more elements

A system comprising:

a DC-link;
a voltage inverter coupled to the DC-link and configured to convert a DC voltage from the DC-link into a first AC voltage;
an electromechanical device coupled to the voltage inverter and configured to convert the first AC voltage into a mechanical output;
and
an energy conversion system comprising:
a plurality of energy storage devices configured to store DC energy;
a plurality of voltage converters, each voltage converter configured to convert a stored voltage from a respective energy storage device into a DC supply voltage based on a setpoint signal;
a power management controller configured to iteratively:
calculate the setpoint signal based on a target voltage for the DC-link;
and
supply the setpoint signal to the plurality of voltage converters;
a first DC-link voltage controller configured to iteratively:
determine the target voltage based on the setpoint signal;
calculate a first adjustment signal based on a difference between the target voltage and the DC supply voltage;
and
supply the first adjustment signal to the first voltage converter, wherein the first voltage converter is further configured to convert the stored voltage based on the first adjustment signal;
and
wherein a frequency of the power management controller to iteratively calculate and supply the setpoint signal to the plurality of voltage converters is lower than a frequency of the first DC-link voltage controller to calculate and supply the first adjustment signal to the first voltage converter.

15 more elements

Dependencies are inferred from the claim text.

Apparatus and system for power conversion

Life of this patent

Apparatus and system for power conversion

Life of this patent

Abstract

Claims20