Smart/Intelligent Grid Development and Deployment. Smart Thai Workshop: Mr. Juergen Bender Global Head Utility Solutions, Orga Systems

Transcription

1 Funded by: Smart/Intelligent Grid Development and Deployment in Thailand d(smart tthai) European Union Smart Thai Workshop: Global Standardization Efforts Mr. Juergen Bender Global Head Utility Solutions, Orga Systems 16th July th July 2012 EGAT, Tor.102 Building, 20th Floor, Room no. 5

2 Global Standard IEC EGAT Workshop

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4 IEC Introduction The traditional approach to substation integration used standardized RTU protocols that were designed to provide protocol efficiency for operation over bandwidth limited serial links. To truly take advantage of this technology and dramatically lower the total cost of ownership of substation automation systems, a new approach to substation integration that goes beyond a simple RTU protocol is needed. The recent international standard IEC proposes a unified solution of the communication aspect of substation automation. The IEC international standard, drafted by substation automation domain experts from 22 countries, seeks to tackle the aforementioned situation. This standard takes advantage of a comprehensive objectoriented data model and the Ethernet technology, bringing in great reduction of the configuration and maintenance cost. Page: 3

5 Drivers To Develop IEC61850 Once upon a time, substation automation systems utilized simple, straightforward and highly specialized communication protocols. Today s substation automation systems can no longer enjoy such simplicity because of their growing complexity equipment becomes more intelligent and most of those simple old systems have been gradually replaced by open systems, which embrace the advantage of emerging technology like relational database systems, multi-task operating systems and support for state-of-the-art graphical display technology. Utilities have been paying enormous money and time to configure these devices to work together in a single substation. Today most utilities and device manufacturers have recognized the need for a unified international standard to support seamless cooperation among products from different vendors. Page: 4

6 The IEC61850 Standard The first release of the IEC consists of a set of documents of over 1,400 pages. These documents are divided into 10 parts. Since Part 7 defines the core concepts of the IEC standard, we will focus on this part in this workshop. Subpart 7.1.Principles and Models Title 7.2.Abstract Communication Service Interface 7.3.Common Data Classes 7.4.Compatible Logical Node Classes and Data Classes The IEC standard is not easy to understand for people other than experts in the substation automation domain due to the complexity of the documents and the assumed domain-specific knowledge. Page: 5

7 Challenges As a substation automation standard proposed by a group of domain experts, the IEC protocol assumes quite an amount of domainspecific knowledge, which is hardly accessible by engineers and researchers out of the substation automation domain. The entire standard, except Part 6, is described in natural language with tables and pictures, which is known to be ambiguous and lack of preciseness. The experts proposing this protocol come from 22 different countries and are divided into 10 working groups, each responsible to one part of the standard. The standard is designed to be implementation independent but this is not always true. Things are mixed up in the documents. Page: 6

8 Substation Architecture A typical substation architecture is shown below. The substation network is connected to the outside wide area network via a secure gateway. Interactions inside a substation automation system mainly fall into three categories: data gathering/setting, data monitoring/reporting and event logging. Page: 7

9 Communication Structure The IEC standard defines a relatively complicated communication structure. Abstract communication service interface profile (ACSI) Object oriented substation event profile (GOOSE) Generic substation status event profile (GSSE) Sampled measured value multicast profile (SMV) The time synchronization profile. Page: 8

10 Abtract Communication Service Interface ACSI defines the semantics of the data exchanged between applications and servers, thus it becomes the major part of the IEC standard. The standard committee adopt an object-oriented approach in the design of ACSI, which includes a hierarchical and comprehensive data model and a set of available services for each class in this data model. The benefits of using an object-oriented utility communication interface are two fold: On the one hand, objects (e.g. registers) can be referenced in an intuitive way (e.g. Relay0/MMXU0.voltage ) instead of by the traditional physical address (like Reg#02432). On the other hand, software engineers can build more reliable applications using such service interface. Page: 9

11 Summary The IEC standard has been specifically designed for electrical substation automation systems which provide a solution to the interoperability of IED s. It provides a common method of storing data, provides a fast transfer of data for protective devices and is based on the Ethernet standard. IEC standard is fast becoming the only choice for a protocol in electrical substations worldwide. Page: 10

12 Thank you! 2012 Orga Systems GmbH All rights reserved orga-systems.com