Constant power adaptive power system

• US 10,439,402 B2
• Filed: 12/13/2017
• Issued: 10/08/2019
• Est. Priority Date: 02/14/2017
• Status: Active Grant

• Current Assignee: Johns Hopkins University
• Original Assignee: Johns Hopkins University
• Inventors: Boehmer, Tyler J., Temkin, Deanna K.
• Primary Examiner(s): Amaya, Carlos
• Application Number:
  US15/840,085
• Publication Number:
  US 20180233925A1
• Time in Patent Office: 664 Days
• Field of Search: 307 46
• CPC Class Codes: H02J 5/00 Circuit arrangements for transfer of electric power between ac networks and dc networks H02J3/36 takes precedence
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 3/33584 Bidirectional converters

Abstract

An adaptive power system for powering a dynamically changing load may include an energy storage device, a bi-directional current source, and compensation circuitry. The bi-directional current source may be electrically connected between the energy storage device and a power distribution bus of a power distribution system. Further, the bi-directional current source is configured to receive a compensation value and, based on the compensation value, maintain a constant power level on the power distribution bus by delivering current to the power distribution bus from the energy storage device or absorbing current from the power distribution bus for storage in the energy storage device. The compensation circuitry may be configured to generate the compensation value. An expected average current value for the dynamically changing load and a power distribution bus current value may be used to generate the compensation value for maintaining the constant power level on the power distribution bus.

Claims

1. An adaptive power system for powering a dynamically changing load, the adaptive power system comprising:

an energy storage device;

a bi-directional current source configured to be electrically connected between the energy storage device and a power distribution bus of a power distribution system, wherein the bi-directional current source is configured to receive a compensation value and, based on the compensation value, maintain a constant power level on the power distribution bus by delivering current to the power distribution bus from the energy storage device or absorbing current from the power distribution bus for storage in the energy storage device; and

compensation circuitry including energy compensation loop circuitry and configured to generate the compensation value,

wherein an expected average current value for the dynamically changing load and a power distribution bus current value are used to generate the compensation value for maintaining the constant power level on the power distribution bus,

wherein the compensation circuitry is further configured to generate a difference between a reference current value and the power distribution bus current value, the difference being used to generate the compensation value, and

wherein the energy compensation loop circuitry of the compensation circuitry is configured to generate the reference current value based on the expected average current value.

2. The adaptive power system of claim 1, wherein the energy compensation loop circuitry of the compensation circuitry is further configured to generate the reference current value based on a combination of an energy compensation loop value and the expected average current value.

3. The adaptive power system of claim 2, wherein the energy compensation loop circuitry is configured to generate the energy compensation loop value based on an energy storage device value, the expected average current value, and a load current value;

wherein the energy storage device value is an indication of the quantity of energy stored in the energy storage device.

4. The adaptive power system of claim 1, wherein the energy storage device comprises a storage capacitor, a battery, a super capacitor, or super conducting magnetic energy storage.

5. The adaptive power system of claim 1 further comprising an electromagnetic interference filter disposed between the power distribution system and the dynamic load.

6. An adaptive power system for powering a dynamically changing load, the adaptive power system comprising:

an alternating current (AC) generator;

an AC to direct current (DC) converter coupled between the generator and the dynamically changing load;

an energy storage device;

a bi-directional current source configured to be electrically connected between the energy storage device and a power distribution bus of a power distribution system, wherein the bi-directional current source is configured to receive a compensation value and, based on the compensation value, maintain a constant power level on the power distribution bus by delivering current to the power distribution bus from the energy storage device or absorbing current from the power distribution bus for storage in the energy storage device; and

compensation circuitry including energy compensation loop circuitry and configured to generate the compensation value,

wherein an expected average current value for the dynamically changing load and a power distribution bus current value are used to generate the compensation value for maintaining the constant power level on the distribution bus,

wherein the compensation circuitry is further configured to generate a difference between a reference current value and the power distribution bus current value, the difference being used to generate the compensation value, and

wherein the energy compensation loop circuitry of the compensation circuitry is configured to generate the reference current value based on the expected average current value.

7. The adaptive power system of claim 6, wherein the energy compensation loop circuitry of the compensation circuitry is further configured to generate the reference current value based on a combination of an energy compensation loop value and the expected average current value.

8. The adaptive power system of claim 7, wherein the energy compensation loop circuitry is configured to generate the energy compensation loop value based on an energy storage device value, the expected average current value, and a load current value;

wherein the energy storage device value is an indication of the quantity of energy stored in the energy storage device.

9. The adaptive power system of claim 6, wherein the energy storage device comprises a storage capacitor, a battery, a super capacitor, or super conducting magnetic energy storage.

10. The adaptive power system of claim 6 further comprising an electromagnetic interference filter disposed between the power distribution system and the dynamic load.

11. A method for powering a dynamically changing load, the method comprising:

generating a reference current value based on a combination of an energy compensation loop value and an expected average current value;

generating a difference between the reference current value and a power distribution bus current value;

generating a compensation value based on the expected average current value for the dynamically changing load and the difference between the reference current value and the power distribution bus current value; and

maintaining a constant power level on the power distribution bus by controlling a bi-directional current source to deliver, based on the compensation value, current to the power distribution bus from an energy storage device or absorb, based on the compensation value, current from the power distribution bus for storage in the energy storage device.

12. The method of claim 11 further comprising generating the energy compensation loop value based on an energy storage device value, the expected average current value, and a load current value;

wherein the energy storage device value is an indication of the quantity of energy stored in the energy storage device.

13. The method of claim 11 wherein the energy storage device comprises a storage capacitor, a battery, a super capacitor, or super conducting magnetic energy storage.