Monday, March 29, 2010

IEC 61400-25 AND IEC 61850 for Wind Turbines

The standard IEC 61400-25 (Wind turbines – IEC 61400-25: Communications for monitoring and control of wind power plants) must be seen in conjunction with IEC 61850. The wind turbine specific information models (Logical Nodes) can be used with IEC 61850 compliant tools and communication stacks. Services like GOOSE and Sampled Values Exchange are NOT referenced in IEC 61400-25 - because the SCADA experts that have defined the standard series some 10 years ago did not see any need to include these services in the list of services to be inherited from IEC 61850.

From a technical and implementation point of view there is no reason to not use these real-time services for wind power applications. Any IEC 61850 compliant implementation of GOOSE and SV could be used to exchange any data object of IEC 61400-25-2 (Wind turbine LNs). The missing reference of GOOSE and SV in IEC 61400-25 has already been used to state that IEC 61400-25 would not support real-time services (I guess this is an excuse in order to propose a non-IEC61850 solution for real-time applications, e.g., a fieldbus).  The statement is - from a document point of view - true, but the fact is, that GOOSE and SV as specified in IEC 61850 can be understood as an integral part of IEC 61400-25. That is the benefit of the fact that IEC 61400 builds on IEC 61850 - most of the IEC 61850 definitions, implementations, and tools can be used also for wind power plants - without any change!

On the other side: The additional communication stacks (mappings) defined in IEC 61400-25-4 may are usually not implemented in substation IEDs. The stacks specified in this part of IEC 61400-25 comprise:

  • SOAP-based web services,
  • a mapping to OPC/XML-DA,
  • a mapping to MMS (IEC 61850-8-1),
  • a mapping to IEC 60870-5-104,
  • a mapping to DNP3.

Click HERE for more details on mappings in IEC 61400-25-4.
Click HERE for a General Electric paper that discusses the application of SV realtime communication in wind power parks.

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