FREQUENCY REGULATION METHOD

• US 20140052308A1
• Filed: 03/08/2013
• Published: 02/20/2014
• Est. Priority Date: 03/08/2012
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Hanafusa, Hiroshi
• Granted Patent: US 9,660,442 B2
• Time in Patent Office: Days
• US Class Current: 700/295
• CPC Class Codes: G05F 1/66 Regulating electric power
• CPC Class Codes: H02J 13/00006 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
• CPC Class Codes: H02J 2310/54 according to a pre-established time schedule
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: H02J 3/32 using batteries with converting means
• 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: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/14 Energy storage units
• CPC Class Codes: Y04S 20/12 Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
• CPC Class Codes: Y04S 40/12 characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment

Abstract

A frequency regulation method for a grid which is performed by a control device that connects, through a communication network, a controller for controlling at least one load device and a storage battery. The frequency regulation method including: obtaining, when it is detected that a frequency of a grid deviates from a predetermined range, an instruction signal including a power instruction value for keeping the frequency of the grid within the predetermined range; and generating a control signal for controlling the load device when the load device is operable in accordance with the instruction signal, and transmitting the control signal to the controller, and generating a control signal for charging or discharging the storage battery when the load device is not operable in accordance with the instruction signal, and transmitting the control signal to the storage battery.

Claims

1-12. -12. (canceled)

13. A frequency regulation method for regulating a frequency of a grid by controlling a storage battery system and a load device, the frequency regulation method comprising:

obtaining, when it is detected that a frequency of a grid deviates from a predetermined range, an instruction signal including a power instruction value for keeping the frequency of the grid within the predetermined range; and

generating a first control signal for controlling the load device when the load device is operable in accordance with the instruction signal, and controlling the load device based on the first control signal, and

generating a second control signal for charging or discharging the storage battery system when the load device is not operable in accordance with the instruction signal, and controlling the storage battery system based on the second control signal.

14. The frequency regulation method according to claim 13, comprising

causing the load device to consume power supplied from the grid, based on the first control signal, when the load device is operable in accordance with the instruction signal.

15. The frequency regulation method according to claim 14, comprising

causing the load device to operate in accordance with the instruction signal by decreasing or increasing an amount of power consumption by the load device, when the load device is caused to operate.

16. The frequency regulation method according to claim 13, comprising

determining whether or not the load device is operable in accordance with the instruction signal, by comparing power characteristics and the instruction signal by reference to a management table which stores information about the power characteristics when the load device operates.

17. The frequency regulation method according to claim 13, comprising

controlling the load device when a cycle in which power corresponding to the power instruction value is exchanged with the grid is greater than or equal to a predetermined value, and charging or discharging the storage battery system when the cycle is less than the predetermined value.

18. The frequency regulation method according to claim 13, comprising

controlling the load device upon obtaining the instruction signal, and causing the storage battery system to charge or discharge differential power relative to the power instruction value when the differential power is present relative to the power instruction value even in the case where the load device is controlled in a period when power corresponding to the power instruction value is exchanged between the load device and the grid.

19. The frequency regulation method according to claim 13, comprising

controlling the load device to cause a remaining battery level of the storage battery system at an end of a frequency regulation period to reach a predetermined target value, the frequency regulation period being a period when a frequency of the grid is regulated.

20. The frequency regulation method according to claim 19, comprising

controlling the load device to cause the remaining battery level of the storage battery system at the end of the frequency regulation period to reach the predetermined target value, by controlling the load device to compensate power conversion loss of the storage battery system in the frequency regulation period.

21. The frequency regulation method according to claim 19,

wherein the predetermined target value is a remaining battery level of the storage battery system at a start of the frequency regulation period,

the frequency regulation method comprising controlling the load device to cause the remaining battery levels of the storage battery system at the start and end of the frequency regulation period to be equal.

22. The frequency regulation method according to claim 16,

wherein the management table previously stores information about respective power characteristics of a plurality of the load devices,

the frequency regulation method comprising determining whether or not each of the load devices is operable in accordance with the instruction signal using power characteristics obtained by combining the power characteristics of the load devices.

23. The frequency regulation method according to claim 22, comprising:

setting an incentive which is to be offered to a user of the load device to be higher for a higher degree of approximation between the power characteristics of the load device and a waveform of the instruction signal; and

selecting a combination of load devices having a highest incentive.

24. The frequency regulation method according to claim 13, comprising:

setting an incentive which is to be offered to a user of the load device to be higher for a higher degree of approximation between the power characteristics of the load device and a waveform of the instruction signal; and

charging or discharging the storage battery system when the incentive is less than a predetermined threshold value.

25. The frequency regulation method according to claim 13,

wherein the load device is at least one of a household appliance, a pump, a heater, and a refrigerator.

26. A frequency regulation system which regulates a frequency of a grid, the frequency regulation system comprising:

a storage battery system; and

a server which generates a control signal for controlling the storage battery system and a load device,

wherein the server includes;

a communicating unit configured to communicate with the storage battery system;

an obtaining unit configured to obtain, when it is detected that a frequency of a grid deviates from a predetermined range, an instruction signal including a power instruction value for keeping the frequency of the grid within the predetermined range; and

a control unit configured to (i) generate a first control signal for controlling the load device when the load device is operable in accordance with the instruction signal, and control the load device based on the first control signal, and (ii) generate a second control signal for charging or discharging the storage battery system when the load device is not operable in accordance with the instruction signal, and transmit the generated second control signal to the storage battery system through the communicating unit, and

the storage battery system includes;

at least one storage battery;

a receiving unit configured to receive the control signal; and

a control unit configured to control charging or discharging of the storage battery based on the received control signal.

27. A server comprising:

a communicating unit configured to communicate with a storage battery system;

an obtaining unit configured to obtain, when it is detected that a frequency of a grid deviates from a predetermined range, an instruction signal including a power instruction value for keeping the frequency of the grid within the predetermined range; and

a control unit configured to (i) generate a control signal for controlling the load device when the load device is operable in accordance with the instruction signal, and control the load device based on the control signal, and (ii) generate a control signal for charging or discharging the storage battery system when the load device is not operable in accordance with the instruction signal, and transmit the generated control signal to the storage battery system through the communicating unit.