SYSTEM AND METHOD FOR CONTROLLING NETWORKED, GRID-LEVEL ENERGY STORAGE DEVICES

• US 20150097531A1
• Filed: 10/03/2014
• Published: 04/09/2015
• Est. Priority Date: 10/03/2013
• Status: Abandoned Application

• Current Assignee: The Trustees of Princeton University (Princeton University)
• Original Assignee: The Trustees of Princeton University (Princeton University)
• Inventors: Powell, Warren, Salas, Daniel
• Application Number:
  US14/506,246
• Publication Number:
  US 20150097531A1
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A method for controlling an energy storage system coupled to a power grid is disclosed. The method includes providing a processor configured to receive current state information including energy level in the storage system, current energy price information and current load information from the power grid. A scalar piecewise linear value function is iteratively solved using the current state information and generating charge/discharge control information. The charge/discharge control information is transmitted to the energy storage system.

Claims

1. ) A method for controlling an energy storage system coupled to a power grid, the method comprising:

providing a processor configured to receive current state information including energy level in the storage system, current energy price information and current load information from the power grid;

iteratively solving a scalar piecewise linear value function using the current state information and generating charge/discharge control information; and

transmitting the charge/discharge control information to the energy storage system.

2. ) The method of claim 1, further comprising initializing the scalar piecewise linear value function.

3. ) The method of claim 1, further comprising updating the scalar piecewise linear value function on each iteration.

4. ) The method of claim 1, further comprising determining the effect of marginal value of energy in the storage system.

5. ) The method of claim 4, wherein determining the marginal value of energy in the storage system is repeated over a planning horizon.

6. ) The method of claim 1, further comprising stepping back in time to update the marginal value of energy.

7. ) The method of claim 1, further comprising smoothing the marginal value into the scalar piecewise linear value function.

8. ) The method of claim 1, further comprising updating the scalar piecewise linear value function to maintain concavity.

9. ) The method of claim 1, further comprising updating the charge/discharge state of the energy storage system based on the charge/discharge control information.

10. ) A system for controlling an energy storage system coupled to a power grid, the system comprising:

a processor configured to receive current state information including energy level in the storage system, current energy price information and current load information from the power grid;

the processor being configured to iteratively solve a scalar piecewise linear value function using the current state information and generating charge/discharge control information; and

The processor being configured to transmit the charge/discharge control information to the energy storage system.

11. ) The system of claim 10, wherein the processor is configured to initialize the scalar piecewise linear value function.

12. ) The system of claim 10, wherein the processor is configured to update the scalar piecewise linear value function on each iteration.

13. ) The system of claim 10, wherein the processor is configured to determine the effect of marginal value of energy in the storage system.

14. ) The system of claim 13, wherein the processor is configured to determine the marginal value of energy in the storage system is repeated over a planning horizon.

15. ) The system of claim 10, wherein the processor is configured to step back in time to update the marginal value of energy.

16. ) The system of claim 10, wherein the processor is configured to smooth the marginal value into the scalar piecewise linear value function.

17. ) The system of claim 10, wherein the processor is configured to update the scalar piecewise linear value function to maintain concavity.

18. ) The system of claim 10, wherein the processor is configured to update the charge/discharge state of the energy storage system based on the charge/discharge control information.

19. ) A computer-readable medium having stored thereon a computer program for execution by a processor configured to perform a method for controlling an energy storage system coupled to a power grid, the method comprising:

providing a processor configured to receive current state information including energy level in the storage system, current energy price information and current load information from the power grid;

iteratively solving a scalar piecewise linear value function using the current state information and generating charge/discharge control information; and

transmitting the charge/discharge control information to the energy storage system.