Power load control system for utility power system

• US 8,185,250 B2
• Filed: 09/23/2009
• Issued: 05/22/2012
• Est. Priority Date: 09/23/2009
• Status: Expired due to Fees

• Current Assignee: Peoplewave, Inc.
• Original Assignee: Peoplewave, Inc.
• Inventors: Sato, Koichi
• Primary Examiner(s): HARTMAN JR, RONALD D
• Application Number:
  US12/565,724
• Publication Number:
  US 20110068946A1
• Time in Patent Office: 972 Days
• Field of Search: 700/295
• US Class Current: 700/295
• CPC Class Codes: G05B 13/024 in which a parameter or coefficient is automatically adjusted to optimise the performance

Abstract

The system frequency can be effectively and efficiently regulated within a permissive range by using a power load control system capable of matching a high frequency component of a total generated power to a variation of total power consumption of power equipments.

Claims

1. A control system of a power system for regulating a system frequency comprising:

an electrical energy meter measuring a generated power of an electric power generator;

a control box controlling a power equipment; and

a control center being disposed in at least one location, said control center receiving information of said generated power from said electrical energy meter through an upstream communication channel connecting said electrical energy meter and said control center, said control center calculating a total generated power of said electric power generator, said control center extracting a high frequency component of said total generated power of said electric power generator, said control center communicating with said control box through a command communication channel, said control center matching a variation of total power consumption of said power equipment to an amount of said high frequency component of said total generated power of said electric power generator.

2. The control system of claim 1 wherein said power equipment is individually controlled by said control center via a bi-directional communication between said control center and said control box.

3. The control system of claim 1 wherein said power equipments are controlled by a common command from said control center via a one-directional communication from said control center to said control box.

4. The control system of claim 1 wherein said power equipment is controlled by said control box when said command communication channel is disabled.

5. The control system of claim 1 wherein said power equipment has a variable power consumption level in a range between 0% and 100% of a maximum power consumption.

6. The control system of claim 1 wherein said power equipment has either 0% or 100% of a maximum power consumption level.

7. The control system of claim 1 wherein a plurality of said electrical energy meters are installed.

8. The control system of claim 1 wherein said control box controls power consumption by turning a power of said power equipment ON and OFF.

9. The control system of claim 1 wherein said control box controls power consumption by changing a voltage of a supplied AC power to a power equipment.

10. The control system of claim 1 wherein said control box controls power consumption by modifying a waveform of a supplied AC power to said power equipment.

11. The control system of claim 1 wherein a power consumption of said power equipment is controlled by controlling a temperature setting of an appliance.

12. The control system of claim 1 wherein said power equipment is a servomotor by which hard disk'"'"'s revolution speed is controlled.

13. The control system of claim 1 wherein said power equipment is a servomotor in which power consumption is controlled by controlling an activation process.

14. The control system of claim 1 wherein a power consumption of said power equipment is controlled by changing a frequency of a supplied AC power to a power equipment when a power of said power equipment is ON.

15. The control system of claim 2, wherein said control center obtains information on an expected time when power consumption level of a power equipment is to be changed next time based on information received from said control box.

16. The control system of claim 15, wherein said control center selects power equipments to change power consumption levels based on said expected time of changing said power consumption level of said power equipments.

17. The control system of claim 2, wherein said control center make a prediction of said total power consumption by said power equipments by using at least one of said expected time of changing power consumption level of said power equipments and predicted power consumption characteristics for said power equipments.

18. The control system of claim 6, wherein said controlling ON or OFF power consumption level is done by changing a set value for said power equipment.