wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

IEC 61850 for Distributed Energy Resources 59-7
• Similar to the GOOSE model, the SAV model applies to the exchange of values of a DATA-SET.
The difference in this case is that the data of the data set are of the common data class SAV (sampled
analog value).
59.4.4 Clock Synchronization
For the clock-synchronization of an IED with a central time-server, the standard network time protocol
(SNTP) is specified for nontime-critical applications. Separate synchronization is required for the SAV
process. In future this will be implemented according to IEC 61588. The implementation of the use of a
time-dissemination-service, like for instance Global Position System (GPS), is also allowed.
59.5 Modeling with System Configuration Language
An IED can control big systems like a wind-park or small systems like a simple sensor used for collecting
data (e.g., temperature sensor or electric meter). The information produced and consumed by
automation functions and the communication interface in such IEDs are modeled with the System
Configuration Language (SCL) in a SCL file. For the SCL language, the standard IEC 61850-6 is still
valid (developed for the substation automation) [Sta1] where SCL is named as Substation Configuration
Language. A SCL file applied in distributed energy resources includes in a hierarchical structure the
following information (Figure 59.7):
SCL-File
IED
Services
GetDirectory
GetDataObjectDefinition
Read/Write
ReportSettings
Access point
Server
LDevice
Data type templates
LPHD1
LN0
DPVC1
XCBR1
ZINV1
XSWI1
CSWI1
XCBR2
MMXU1
FIGURE 59.7
Example of how the SCL file is organized.
© 2011 by Taylor and Francis Group, LLC