Thermal energy storage apparatus, controllers and thermal energy storage control methods

Patent metadata

Field	Value
Publication number	US-9331483-B2
Application number	US-89565810-A
Country	US
Kind code	B2
Filing date	Sep 30, 2010
Priority date	Dec 17, 2009
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Thermal energy storage apparatus, controllers and thermal energy storage control methods are described. According to one aspect, a thermal energy storage apparatus controller includes processing circuitry configured to access first information which is indicative of surpluses and deficiencies of electrical energy upon an electrical power system at a plurality of moments in time, access second information which is indicative of temperature of a thermal energy storage medium at a plurality of moments in time, and use the first and second information to control an amount of electrical energy which is utilized by a heating element to heat the thermal energy storage medium at a plurality of moments in time.

First claim

What is claimed is:

1. A thermal energy storage control method comprising:
accessing information regarding a state of an electrical power generation utility;
controlling the application of electrical energy from the electrical power generation utility to a heating element of a thermal energy storage apparatus which is configured to heat a thermal energy storage medium, wherein the controlling comprises increasing an amount of the electrical energy utilized by the heating element to heat the thermal energy storage medium as a result of the accessed information indicating a presence of a surplus of electrical energy upon the electrical power generation utility;
wherein the increasing comprises, using a temperature of the thermal energy storage medium and the information indicating the presence of the surplus of electrical energy upon the electrical power generation utility, selecting one of a plurality of different increased amounts of the electrical energy, and applying the selected one different increased amount of the electrical energy to the heating element; and
wherein the selecting comprises:
selecting one of a plurality of functions using the temperature of the thermal energy storage medium; and
using the selected function and the information indicating the presence of the surplus of electrical energy upon the electrical power generation utility, selecting the one of the different increased amounts of the electrical energy; and

wherein the selected function is selected at one moment in time, and further comprising:
selecting a second of the functions using the temperature of the thermal energy storage medium at a second moment in time; and
using the selected second function, increasing the amount of the electrical energy utilized by the heating element to heat the thermal energy storage medium to at least a substantially maximum amount as a result of the accessed information indicating the presence of the surplus of electrical energy upon the electrical power generation utility exceeding a threshold.

2. The method of claim 1 wherein the controlling comprises controlling the application of electrical energy to the heating element of the thermal energy storage apparatus which comprises a water heater and which is configured to heat the thermal energy storage medium comprising water within a reservoir of the water heater.

3. The method of claim 1 further comprising monitoring an electrical characteristic of the electrical energy upon the electrical power generation utility and which is indicative of the surplus of the electrical energy upon the electrical power generation utility, and wherein the accessing comprises accessing the information which results from the monitoring.

4. The method of claim 1 wherein the accessing comprises accessing the information regarding the state of the electrical power generation utility comprising a relationship of consumption and generation of electrical energy with respect to the electrical power generation utility, and wherein the controlling comprises controlling to provide an improved state of balance of the consumption and the generation of the electrical energy upon the electrical power generation utility compared with the state of balance in an absence of the controlling.

5. The method of claim 1 wherein the heating element comprises a first heating element and the controlling comprises controlling the application of electrical energy from the electrical power generation utility to the first heating element and a second heating element, and wherein the increasing comprises increasing the electrical energy to only one of the first and second heating elements at a moment in time as a result of the accessed information indicating the presence of the surplus of electrical energy upon the electrical power generation utility.

6. The method of claim 1 further comprising:
selecting a third of the functions using the temperature of the thermal energy storage medium at a third moment in time; and
using the selected third function, increasing the amount of the electrical energy utilized by the heating element to heat the thermal energy storage medium without use of the information indicating the presence of the surplus of electrical energy upon the electrical power generation facility at the third moment in time.

7. The method of claim 6 further comprising, using the second function, utilizing no electrical energy by the heating element to heat the thermal energy storage medium as a result of the information indicating the presence of the surplus of electrical energy upon the electrical power generation utility being less than the threshold.

8. The method of claim 1 wherein the threshold is a first threshold, and another of the functions results in the application of no electrical energy from the electrical power generation utility to the heating element if the temperature of the thermal energy storage medium is greater than a temperature threshold and an amount of the electrical energy upon the electrical power generation utility is less than a second threshold.

9. The method of claim 1 wherein different ones of the functions relate different ranges of the information regarding the state of the electrical power generation to a common overlapping range of different amounts of the electrical energy which are applied to the heating element.

10. A thermal energy storage control method comprising:
heating a thermal energy storage medium using electrical energy which is supplied by an electrical power system;
accessing information which is indicative of a relationship of generation and consumption of electrical energy of the electrical power system;
using the accessed information, adjusting an amount of electrical energy which is utilized to implement the heating of the thermal energy storage medium to reduce a difference between generation and consumption of the electrical energy of the electrical power system;
wherein the adjusting comprises adjusting the amount of electrical energy according to one of a plurality of different functions which individually include a plurality of different associations of:
a plurality of different relationships of generation and consumption of electrical energy of the electrical power system; and
a plurality of different amounts of the electrical energy which is utilized to implement the heating of the thermal energy storage medium;

monitoring a temperature of the thermal energy storage medium; and
selecting the one of the different functions using the temperature of the thermal energy storage medium;
wherein the different functions cause different duty cycles to be used to control the adjusting of the amount of electrical energy which is utilized to implement the heating of the thermal energy storage medium for a single one of the different relationships of the generation and consumption of electrical energy of the electrical power system; and
wherein at least a substantially maximum duty cycle is used to adjust the amount of electrical energy which is utilized to implement the heating of the thermal energy storage medium as a result of the relationship of the generation and consumption of electrical energy exceeding a threshold.

11. The method of claim 10 wherein the adjusting comprises adjusting to provide regulation services to the electrical power system.

12. The method of claim 10 wherein the heating comprises heating the thermal energy storage medium comprising water within a reservoir of a water heater.

13. The method of claim 10 wherein the accessing comprises monitoring an electrical characteristic of the electrical energy upon the electrical power system which

Assignees

• Hammerstrom Donald J
• Battelle Memorial Institute

Inventors

• Hammerstrom Donald J

Classifications

• H05B1/0227

  Applications · CPC title

• H02J3/28 Primary

  Arrangements for balancing of the load in networks by storage of energy · CPC title

• G05D23/1923

  using thermal energy, the cost of which varies in function of time · CPC title

• H02J3/38

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• Y02E10/56

  Power conversion systems, e.g. maximum power point trackers · CPC title