DNP3 based Ethernet port power saving for solar power energized RTU system

• US 9,874,928 B2
• Filed: 06/22/2015
• Issued: 01/23/2018
• Est. Priority Date: 06/22/2015
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Zou, Ke, Lv, Enkui, Wang, Yanqiu
• Primary Examiner(s): Rehman, Mohammed
• Assistant Examiner(s): Mazyad, Alyaa T
• Application Number:
  US14/745,726
• Publication Number:
  US 20160370853A1
• Time in Patent Office: 946 Days
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: G06F 1/305 in the event of power-supply fluctuations
• CPC Class Codes: G06F 1/3212 Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: H02J 13/00028 involving the use of Internet protocols
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 13/0005 the elements or equipment being or involving power plugs or sockets
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
• 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: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin
• CPC Class Codes: Y02P 90/50 Energy storage in industry with an added climate change mitigation effect
• CPC Class Codes: Y04S 10/123 the energy generation units being or involving renewable energy sources
• 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

Abstract

A system includes a control system and a Remote Terminal Unit (RTU). The control system is configured to communicate data with one or more field devices via the RTU. The RTU is configured to transmit received data from the one or more field devices and the control system. The RTU is also configured to activate a power saving mode that selectively provides power to transmit the received data. The RTU is further configured to, while the power saving mode is activated, prevent power from being provided to transmit the received data, and store the received data in a memory of the RTU when the power is not provided to transmit the received data. The RTU is configured to, while the power saving mode is activated, provide power to transmit the received data after storing the received data in the memory of the RTU.

Claims

1. A system comprising:

a Remote Terminal Unit (RTU) comprising (i) a controller configured to control one or more operations of the RTU and (ii) an Input/Output (I/O) module configured to be communicatively coupled between the controller and one or more field devices; and

a control system configured to communicate with the one or more field devices via the RTU;

wherein the RTU is configured to;

transmit and receive data communicated between the one or more field devices and the control system,

activate a power saving mode that selectively provides power to the I/O module during the power saving mode, and

while the power saving mode is activated;

prevent the power from being provided to the I/O module in order to prevent the I/O module from transmitting received data,

store the received data in a memory of the RTU for a specified duration of time when the power is not provided to the I/O module, the specified duration of time based on a current network speed, and

provide the power to the I/O module in order to allow the I/O module to transmit the received data after storing the received data in the memory of the RTU.

2. The system of claim 1, further comprising one or more power sources configured to charge one or more batteries to provide the power to the RTU.

3. The system of claim 2, wherein the one or more power sources comprise at least one solar panel.

4. The system of claim 2, wherein the RTU is configured to activate the power saving mode in response to determining that the one or more power sources are not charging the one or more batteries.

5. The system of claim 2, wherein the RTU is configured to activate the power saving mode in response to determining that the one or more batteries are below a threshold charge or in response to determining that the one or more batteries will be below the threshold charge within a threshold period of time.

6. The system of claim 1, wherein the RTU is configured to activate the power saving mode during a particular time of day.

7. The system of claim 1, wherein the control system comprises a Supervisory Control And Data Acquisition (SCADA) system.

8. A Remote Terminal Unit (RTU) comprising:

a controller configured to control one or more operations of the RTU; and

an Input/Output (I/O) module configured to be communicatively coupled between the controller and one or more field devices, the I/O module configured to transmit and receive data communicated between the one or more field devices and the controller when receiving power;

wherein the controller is configured to;

activate a power saving mode that selectively provides power to the I/O module during the power saving mode, and

while the power saving mode is activated;

prevent the power from being provided to the I/O module in order to prevent the I/O module from transmitting received data,

store the received data in a memory of the RTU for a specified duration of time when the power is not provided to the I/O module, the specified duration of time based on a current network speed, and

provide the power to the I/O module in order to allow the I/O module to transmit the received data after storing the received data in the memory of the RTU.

9. The RTU of claim 8, wherein the I/O module comprises an Ethernet port dedicated to a Supervisory Control And Data Acquisition (SCADA) system.

10. The RTU of claim 8, wherein the I/O module is configured to receive the power from one or more batteries that are charged by one or more power sources.

11. The RTU of claim 10, wherein the controller is configured to activate the power saving mode in response to determining that:

the one or more power sources are not charging the one or more batteries,

the one or more batteries are below a threshold charge, or

the one or more batteries will be below the threshold charge within a threshold period of time.

12. The RTU of claim 8, wherein the controller is configured to activate the power saving mode during a particular time of day.

13. The RTU of claim 8, wherein, while the power saving mode is activated, the controller is configured to provide the power to the I/O module to transmit the received data after storing the received data in the memory when an amount of received data stored in the memory reaches a threshold amount of received data.

14. The RTU of claim 8, wherein, while the power saving mode is activated, the controller is configured to provide the power to the I/O module to transmit the received data after storing the received data in the memory for the specified duration of time.

15. The RTU of claim 8, wherein:

the RTU comprises two or more I/O modules, and

while the power saving mode is activated, the controller is configured to provide the power to only one I/O module of the two or more I/O modules at any one period of time.

16. A method comprising:

activating a power saving mode of a Remote Terminal Unit (RTU) that selectively provides power to an Input/Output (I/O) module of the RTU to transmit and receive data communicated between one or more field devices and a controller of the RTU, the I/O module communicatively coupled between the controller and the one or more field devices; and

while the power saving mode is activated;

preventing the power from being provided to the I/O module in order to prevent the I/O module from transmitting received data,

storing the received data in a memory of the RTU for a specified duration of time when the power is not provided to the I/O module, the specified duration of time based on a current network speed, and

providing the power to the I/O module in order to allow the I/O module to transmit the received data after storing the received data in the memory of the RTU.

17. The method of claim 16, wherein the power is provided to the I/O module from one or more batteries that are charged by one or more power sources.

18. The method of claim 17, wherein activating the power saving mode comprises activating the power saving mode in response to determining that:

the one or more power sources are not charging the one or more batteries,

the one or more batteries are below a first threshold charge, or

the one or more batteries will be below the first threshold charge within a first threshold period of time.

19. The method of claim 17, further comprising:

deactivating the power saving mode in response to determining that;

the one or more power sources are charging the one or more batteries,

the one or more batteries are above a higher second threshold charge, or

the one or more batteries will be below a first threshold charge after a longer second threshold period of time.

20. The method of claim 16, further comprising:

deactivating the power saving mode,

providing power to the I/O module of the RTU, and

transmitting additional received data without storing the additional received data in the memory.