Transmission of data from wind turbines and wind farms to a control center

• US 10,306,342 B2
• Filed: 06/21/2016
• Issued: 05/28/2019
• Est. Priority Date: 08/26/2015
• Status: Active Grant

• Current Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Original Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Inventors: Demuth, Simon
• Primary Examiner(s): Wu, Zhen Y
• Application Number:
  US15/754,577
• Publication Number:
  US 20180242057A1
• Time in Patent Office: 1,071 Days
• Field of Search: 34087016
• CPC Class Codes: F03D 7/047 characterised by the controller architecture, e.g. multiple processors or data communications
• CPC Class Codes: F03D 7/048 controlling wind farms
• CPC Class Codes: H04L 41/0681 Configuration of triggering conditions
• CPC Class Codes: H04L 43/0864 Round trip delays
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/60 Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources admission control or resource allocation H04L47/70
• CPC Class Codes: H04L 67/61 taking into account QoS or priority requirements
• CPC Class Codes: H04L 67/62 Establishing a time schedule for servicing the requests
• CPC Class Codes: H04L 69/28 Timers or timing mechanisms used in protocols
• CPC Class Codes: H04Q 2209/10 using a centralized architecture
• CPC Class Codes: H04Q 2209/30 using a wired architecture
• CPC Class Codes: H04Q 2209/75 by polling or interrogating the sub-stations
• CPC Class Codes: H04Q 9/02 Automatically-operated arrangements
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A method for transmitting data records of a plurality of wind turbines or and a plurality of windfarms to a control center as well as a wind turbine, control center and a system configured to perform the method are disclosed. The method includes dispatching a notification of an updated data record from one of the wind turbines or windfarms to the control center. A decision is then made in the control center as to whether the updated data record is to be requested. A request for the updated data record is dispatched from the control center to the wind turbine or windfarm only if the updated data record is to be requested. The request is received in the windfarm or wind turbine and a reply with the updated data record reply is sent to the control center.

Claims

1. A method for transmitting data records of a plurality of wind turbines or windfarms to a control center, comprising:

dispatching a notification of an updated data record from a wind turbine or windfarm of the plurality of wind turbines or windfarms to the control center,

determining, at the control center, whether the updated data record is to be requested, determining whether the updated data record is to be requested includes determining whether a particular time interval assigned to the wind turbine or windfarm has elapsed since a last dispatch of a request or a reception of a last reply including a last data record,

if the time interval has not yet elapsed, ignoring the notification of the updated data record, and

if the time interval has elapsed;

dispatching, from the control center, a request for the updated data record of the wind turbine or windfarm,

receiving the request for the updated data record by the wind turbine or windfarm, and

dispatching a reply with the updated data record from the wind turbine or windfarm to the control center.

2. The method according to claim 1, comprising:

assigning a time interval to each wind turbine or each windfarm of the plurality of wind turbines or windfarms, the wind turbine or windfarm being connected to the control center using a connection.

3. The method according to claim 1, comprising:

automatically adjusting, at the control center, a duration of the time interval.

4. The method according to claim 3, comprising:

setting the time interval, in a default condition, to a default duration, and

shortening or adjusting the time interval to a predefined minimum period in response to a user requesting at least one data record from the wind turbine or windfarm.

5. The method according to claim 1, wherein dispatching the notification of the updated data record and dispatching the reply are performed by a computer assigned to the wind turbine or windfarm.

6. The method according to claim 5, comprising:

serially processing, by the computer, received requests, and

determining, at the control center, a round-trip delay or signal transit time between the control center and the computer, wherein the determination is cyclically repeated with a predefined frequency by at least;

sending a predefined data packet from the control center to the computer, wherein the computer processes the data packet after previously received data packets have been processed and dispatches a reply to the control center during or after the processing,

determining, at the control center, a time period between the sending of the data packet and receiving the reply, and

adjusting a duration of the time interval in each cycle based on the determined time period.

7. The method according to claim 1, comprising:

adjusting the time interval assigned to the wind turbine or windfarm by at least;

determining, at the control center, a difference between a number of dispatched requests and a number of received replies, the difference representing a number of replies not yet received, and

adjusting the time interval based on the difference between the number of dispatched requests and the number of received replies.

8. The method according to claim 7, comprising:

determining the difference in each cycle of a plurality of cycles that are repeated with a predefined frequency or determining the difference in response to receiving the notification of the updated data record is received.

9. The method according to claim 8, comprising:

adjusting the time interval in each cycle,

after the difference is determined, comparing the difference with an upper threshold value and a lower threshold value,

if the difference meets the upper threshold value or is greater than the upper threshold value, lengthening the time interval by a predefined step width, and

if the difference reaches the lower threshold value or is lower than the lower threshold value, shortening the time interval by the predefined step width.

10. The method according to claim 9, comprising:

determining, at each cycle, whether the time interval reaches or exceeds a predefined maximum time interval, and

if the time interval reaches or exceeds the predefined maximum time interval, sending a warning signal.

14. The method according to claim 2, wherein the time interval is variable.

15. The method according to claim 1, comprising:

manually adjusting a duration of the time interval.

16. The method according to claim 5, wherein the computer is part of a Supervisory Control and Data Acquisition (SCADA) system.

11. A windfarm comprising:

one or more wind turbines; and

a computer communicatively coupled to the one or more wind turbines and to a control center, the computer being configured to;

dispatch a notification of an updated data record to the control center,

receive a request for the updated data record from the control center, wherein the request for the updated data record is received from the control center if the control center determines that a particular time interval assigned to the wind turbine or windfarm has elapsed since a last dispatch of a request or a reception of a last reply including a last data record, wherein the control center ignores the notification of the updated data record if the time interval has not yet elapsed since the last dispatch of the request or the reception of the last reply including the last data record, and

send a reply with the updated data record to the control center.

13. A system including a plurality of wind turbines and a plurality of windfarms according to claim 11.

12. A control center, communicatively coupled to a wind turbine or windfarm, the control center being configured to:

receive a notification of an updated data record from the wind turbine or windfarm,

determine whether the updated data record is to be requested, determining whether the updated data record is to be requested includes including determining whether a particular time interval assigned to the wind turbine or windfarm has elapsed since a last dispatch of a request or a reception of a last reply including a last data record,

if the time interval has not yet elapsed, ignoring the notification of the updated data record, and

if the time interval has elapsed;

dispatch a request for the updated data record of the wind turbine or windfarm, and

receive a reply with the updated data record from the wind turbine or windfarm.