POWER MANAGEMENT DEVICE AND POWER MANAGEMENT SYSTEM

• US 20150005978A1
• Filed: 09/19/2014
• Published: 01/01/2015
• Est. Priority Date: 03/27/2012
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: NAKAKITA, Kenji, TAKEHARA, Kiyotaka, NOMURA, Hitoshi, YANAGI, Yasuhiro, TAKAMIYA, Akiko
• Granted Patent: US 9,927,824 B2
• Time in Patent Office: Days
• US Class Current: 700/297
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05F 1/66 Regulating electric power
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: H02J 13/00004 characterised by the power network being locally controlled
• CPC Class Codes: H02J 13/00024 by means of mobile telephony
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• 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: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/00 Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/242 Home appliances
• CPC Class Codes: Y04S 40/00 Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

A controller includes a request acquisition unit that receives an operation permission request from a device, a calculation unit that calculates margin electric power derived from measurement by a measurement unit and an upper limit electric power, and a suppression unit that instructs the device to lower electric power consumption. When the margin electric power is less than the required electric power, the controller suppresses electric power consumption in devices in lower priority order stored in a priority storage unit within the suppression unit, such that electric power consumption increase in the management area may remain within the margin electric power. Then the controller issues the requesting device permission-or-denial for the operation, from the calculation unit.

Claims

1. A power management device configured to communicate with devices in a management area, and to communicate with a measurement unit that measures total electric power used within the management area, comprising:

a controller configured to calculate, after receiving a power level request from a power user device, margin electric power that indicates a power margin previously determined from measurement by the measurement unit and from the upper limit electric power, and that permits or denies the request in accordance with a comparison between required electric power necessary for the operation of the requesting device and the margin electric power,

wherein the controller is configured to suppress power consumption when the margin electric power is smaller than the requested electric power by transmitting a suppression command to a device with a low priority so that even while allowing operation of the requesting device, the increased amount of electric power within the management area remains within the margin electric power.

2. The power management device according to claim 1, wherein the controller is configured to issue a permission command to the requesting power user device when the margin electric power is larger than the required electric power.

3. The power management device according to claim 1, wherein the controller is configured to recalculate the margin electric power and issue a suppression command to the requesting power user device in accordance with the recalculation.

4. The power management device according to claim 1, wherein the controller is configured to notify the device of the permission-or-denial including available electric power as an upper limit for the device, when permitting the operation of the device that transmitted the request.

5. The power management device according to claim 1, wherein the controller is configured to issue available electric power information to the requesting power user device, when permitting operation of the requesting power user device.

6. The power management device according to claim 5, wherein the controller is configured to:

when the margin electric power is smaller than the required electric power and before suppressing electric power consumption in a power user device,

notify the requesting power user device, of available electric power in accordance with the margin electric power including an increased amount due to the suppression of the electric power consumption, and then

re-notify the requesting power user device of available electric power according to a recalculated margin electric power, after a set time period following suppression of power consumption in a power user device.

7. The power management device according to claim 6, wherein the controller is configured to set an upper limit to available electric power in accordance with the margin electric power.

8. The power management device according to claim 1, wherein the power management device further comprises an upper limit change unit configured to change the upper limit electric power in response to an outside request.

9. The power management device according to claim 1, wherein the controller temporarily allows operation of the requesting power user device in accordance with a margin electric power that is recalculated after raising the upper limit electric power during a set time period, when a lower priority power user device capable of power suppression is absent.

10. The power management device according to claim 1, wherein the controller is configured to release power suppression according to the margin electric power when the device is in electric power consumption suppression and the margin electric power may increase within a predetermined re-notification time from the start of the suppression.

11. The power management device according to claim 1, wherein the power management device further comprises a priority change unit configured to make a device priority highest only during a predetermined time period from notification of permission or denial to the requesting power user device.

12. The power management device of claim 1, wherein the controller is a processor within an electrical power switch panel.

13. The power management device of claim 1, wherein the controller is a processor within a personal device assistant.

14. The power management device of claim 13, wherein the controller is a controller is within a cellular telephone.

15. A power management system, comprising:

power user devices within a management area;

a measurement unit configured to measure electric power used in the management area; and

a power management device that can communicate with the measurement unit and with the power user devices, the power management device comprising;

priority storage that stores priority of the power user devices; and

a controller that calculates, upon request from a power user device, margin electric power indicating a margin before the electric power used within the management area reaches an upper limit that is set in advance based on a comparison between measured power by the measurement unit and the upper limit electric power, and notifies the requesting power user device of permission-or-denial for operation according to a comparison between required electric power necessary for the operation of the requesting device and the margin electric power,

wherein the controller is configured to suppress electric power consumption by transmitting a suppression signal to a device with lower priority when the margin electric power is smaller than the required electric power to maintain the increased electric power in use in the management area within the margin electric power even when permission is granted to the requesting device.

16. The power management system of claim 15, wherein the measurement unit is a sensor within an electrical distribution box.

17. The power management system of claim 15, wherein the power user devices comprise a heat pump having a continuously adjustable motor that is suppressed by lowering the power use.

18. The power management system of claim 15, wherein the power management device comprises a cell phone.

19. A method for managing power consuming devices having rated priority levels within a management area by a controller that communicates power consumption requests and permissions with the devices, wherein:

a power manager receives total power information within the management area from a measurement unit sensor;

the power manager compares total power information with a predetermined upper limit of electric power;

the power manager receives power requests from one or more of the power consuming devices;

upon receiving a request from a power consuming device, the power manager determines margin electric power available to meet the request; and

instructs a lower priority device to decrease power to allow operation of the requesting power consuming device.

20. The method of claim 19, wherein the lower priority device is a heat pump with a continuously adjustable compressor motor that is up or down regulated in response to signals from the controller.