Adaptive load cycler for controlled reduction of energy use

• US 5,675,503 A
• Filed: 04/19/1994
• Issued: 10/07/1997
• Est. Priority Date: 04/19/1994
• Status: Expired due to Fees

• Current Assignee: Denver Energy Cost Controls Incorporated
• Original Assignee: Denver Energy Cost Controls Incorporated
• Inventors: Moe, Maynard L., Hedman, Theodore A.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): CHOI, KYLE JAEHUN
• Application Number:
  US08/229,622
• Time in Patent Office: 1,267 Days
• Field of Search: 364/492, 364/493, 307/31-39
• US Class Current: 700/296
• CPC Class Codes: H02J 2310/14 The load or loads being home appliances
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/242 Home appliances

Abstract

A method and system for regulating power delivered to specific appliances or loads which represent but a proportion of the power consumed by different commercial or residential users and in which each appliance or load has variable demands for power consumption, the method and system of the present invention being characterized by measuring the natural run time or average demand of an electrical appliance over a selected real time interval and reducing the run time or average demand of the appliance by an amount directly related to the run-time measurement or average demand measurement of each appliance during periods of peak demand.

Claims

1. In a method for reducing energy delivered by a utility to each of a plurality of energy usage devices representing but a proportion of total power consumption of each of a plurality of consumers wherein each said device has a variable demand for energy, there being a power source and means for delivering power to each said device, the steps comprising:

a) measuring at least one of ambient temperature and humidity conditions;

b) measuring a selected one of average run time and average energy use of each said device over time intervals of predetermined duration;

c) generating a control signal to modify the power consumed by each said device when one of said ambient conditions exceeds a predetermined level; and

d) modifying a selected one of said run time and energy use by each said device by an amount correlated with one of said average run time and energy use measured in step b) herein when said control signal is generated.

2. In the method according to claim 1, including the step of monitoring and storing said selected one of said run time and energy use measurements over a plurality of said time intervals, and calculating and storing said selected one of said average run time and average energy use for each of a preselected range of one of said ambient temperature and humidity conditions of each said device and continuously updating said selected one of said average run time and energy use only during periods in which said control signal is not present.

3. In the method according to claim 1, including the step of monitoring time to generate a control signal when selected ranges for time, temperature and humidity are encountered.

4. In the method according to claim 1, including the step of restricting run time of each device when a control signal is generated to a percentage of said average run time measured.

5. In the method according to claim 4, including the step of restricting the run time of each device to a percentage of the average run time less than the average run time of said device for the time, temperature and humidity conditions of said device when the control signal is generated.

6. In the method according to claim 4, including the step of restricting the energy use of each device to a percentage of the average energy use less than the average energy use of said device for the time, temperature and humidity conditions of said device when the control signal is generated.

7. In the method according to claim 4, including the step of restricting the run time of each device to a fixed time less than the average run time of said device for the time, temperature and humidity conditions of said device when the control signal is generated.

8. In the method according to claim 4, including the step of restricting the energy use of each device to a fixed amount less than the average energy use of said device for the time, temperature and humidity conditions of said device when the control signal is generated.

9. In the method according to claim 1, including the step of restricting energy use of each device during peak power or critical energy use periods to a percentage of said average energy use measured.

10. In the method according to claim 1, including the step of restricting the run time of each device to a fixed amount less than said average run time of said device in response to said control signal for the time, temperature and humidity conditions of said device during peak power or critical energy use periods.

11. In the method according to claim 1, including the step of restricting the energy use of each device to a fixed amount less than the average energy use of said device in response to said control signal for the time, temperature and humidity conditions of said device during peak power or critical energy use periods.

12. In the method according to claim 1, including the step of providing selected control parameters for different periods of the year to optimize control during said periods.

13. In a method for reducing energy delivered by a utility to each of a plurality of energy usage devices including at least one auxiliary load device and at least variable load device representing a portion of the total power consumption of each of a plurality of consumers, there being a power source and means for delivering power to each said device, the steps comprising:

a) measuring at least one of outdoor ambient temperature and humidity conditions;

b) measuring a selected one of average energy use and run time of each said variable load device over time intervals of predetermined duration;

c) generating a control signal to modify the power consumed by each said variable load and auxiliary load device when at least one of said outdoor ambient conditions exceeds a predetermined level;

d) modifying a selected one of said run time and energy use by each said variable load device by an amount correlated with one of said average run time and average energy use measured in step b) herein when said control signal is generated; and

e) restricting the run time and energy use of each said auxiliary load device independently of said variable load device when said control signal is generated.

14. An adaptive load cycler for the controlled reduction of energy delivered by a utility to each of a plurality of energy usage devices which represent a portion of the total power consumption of each of a plurality of consumers wherein there is provided means for supplying power to each said device and each said device has a variable demand for energy, the combination therewith comprising:

a) first means for measuring a selected one of average run time and average energy use of each said device over time intervals of predetermined duration;

b) second means for measuring a selected one of outdoor ambient temperature and humidity conditions;

c) signal means for generating a control signal and transmitting said control signal to each said device whereby to modify the power consumed by each said device when at least one of said outdoor ambient temperature and humidity conditions exceeds a predetermined level; and

d) logic control circuit means for modifying a selected one of said run time and energy use by each said device by an amount correlated with one of said average run time and energy use as measured by said first means when said control signal is generated.

15. An adaptive load cycler according to claim 14, including programmable control circuit means for monitoring and storing said run time and energy use measurements over a plurality of time intervals of predetermined duration and including means for calculating and storing said selected one of said average run time and average energy use for each of a preselected range of one of said outdoor ambient temperature and humidity conditions, and means for continuously updating said selected one of said average run time and average energy use only during periods in which said control signal is not present.

16. An adaptive load cycler according to claim 15, wherein said programmable control circuit means includes means for restricting run time of each said device when a control signal is generated to a percentage of said average run time measured.

17. An adaptive load cycler according to claim 15, said programmable control circuit means including means for restricting energy use of each device during peak power or critical energy use periods to a percentage of said average energy use measured for each respective of said devices.