Engineering Approach for the End User in IEC applications

Transcription

1 21, rue d Artois, F PARIS D2/B5-115 CIGRE 2010 http : // Engineering Approach for the End User in IEC applications N. NIBBIO M. GENIER C. BRUNNER Romande Energie SA SIG UTInnovation Switzerland Switzerland Switzerland E. COTTENS D. MULLER J. REUTER CESSA Infoteam Helinks Switzerland Switzerland Switzerland SUMMARY Substation equipment that conform to IEC allows the end user to retrofit and extend the functionality of the substation. In this paper we report on a case study where a substation that contains devices manufactured by different vendors is extended in two ways by the operator of the substation thanks to the compliance of the equipment to the standard. Thus, IEC yields benefits not only in design but also in the operation phase of a substation. To investigate and evaluate these benefits, two major distribution system operators in western Switzerland collaborate in a demonstration project based on an existing IEC project. The IEC substation selected is a multi vendor environment with bay devices from one vendor and with substation gateway and HMI from a second vendor. The first step of the demonstration project consists of a reengineering of the project using a third party system integration tool that supports the full engineering process according to IEC 61850, which means including the substation section with the links between the switchgear and the information available from the substation automation system. The second step is the demonstration of typical use cases that can appear during the lifetime of the substation like the extension with a new feeder, changes among protection functions, introducing a third party IED, maintenance, etc. The engineering process is designed to cover Bottom Up, Top Down and Maintenance activities and follows the IEC61850 Standard as described in Edition 2 Part 6. The case study comprises conceptual work, tool integration development and execution of an engineering use case to prove the concept. KEYWORDS IEC standard, engineering process, multi vendor environment nadia.nibbio@romande-energie.ch

2 INTRODUCTION Two major distribution system operators in western Switzerland continue to extend their use of IEC in their substations. Since the publication of IEC61850 in 2005, many substations have been built that conform to this standard for exchanging Intelligent Electronic Device (IED) data within the entire automation system of the substation. Being more than a standard for data exchange, IEC includes domain specific object modelling and via the Substation Configuration Language (SCL) a standard engineering data exchange format between design software tools. While the devices supporting IEC are now abundant, there are still some shortcomings with the associated software tools and support of SCL. This is partly due to a lack of specification in the first edition of the standard concerning the various tools (System integration tool; IED configuration tool) and their role in the engineering process. Up to now, most of the completed IEC projects were mainly those supplied by a single vendor who provided the devices and carried out system integration as well. The few multi-vendor projects suffered from the scarcity of system integration tools supporting IEC 61850, thus increasing the monopoly power of the vendors. The second edition of IEC defines the roles of the tools more precisely. With an increase of the functionalities offered by the tools from IED vendors and with the appearance of vendor independent system integration tools interoperability is now becoming possible. Today, more and more devices supporting IEC are available on the market and their conformance to the standard is generally high. These devices implement the object models defined in the standard, allowing the end user to know the semantic meaning of the data being exchanged between the devices. The full use of IEC supported by SCL can provide substantial benefits to the end user not only during the engineering process but during the life time of the substation. To investigate and evaluate these benefits, one case study is conducted on a real IEC project. APPLICATION USE CASES Two cases are considered: one is related to the signal engineering for the communication towards the Human Machine Interface (HMI) and the Network Control Center (NCC), the other to peer-to-peer communication between the IEDs within the substation. The first study consists of adding a new feeder to an existing substation. A new IED (Siemens SJXXX) is to be integrated to a substation. The signals (IEC data attributes) from the new IED will be transmitted to the HMI and NCC through the IEC gateway by means of IEC reports. In addition, these IEC data attributes need to be mapped to internal addresses of the gateway and they need to be associated to the corresponding objects shown in the graphic of the HMI. As an example, a data attribute QB1XSWI.Pos.stVal needs to be associated to the position indication of the switch QB1 in the graphics of the HMI. The second study is related to peer-to-peer communication within the substation. We will integrate a 20 kv busbar reverse blocking scheme based on Generic Object Oriented Substation Event (GOOSE) messages. In case of a close downstream short circuit, both protection units scheme (Feeder IED and Transformer Main 1) will measure the flowing fault current and produce a trip. The trip from the transformer unit would cut off the entire busbar. 2

3 Figure 1: Reverse Blocking In order to prevent this, the feeder protection uses Reverse Blocking to inhibit the trip of the transformer protection. The blocking signal is send using GOOSE messaging (see Figure 1). A STUDY CASE The IEC substation under consideration comprises three voltage levels, 125kV, 20kV and 10kV with 36 bays of which 25 are situated in the 20kV voltage section (see Figure 2). Figure 2: Substation "La Veyre" 3

4 The substation automation (SAS) and protection system of the substation "La Veyre" is a multi vendor environment with bay units from one vendor and substation gateway and HMI from another: Figure3: Substation La Veyre: control and protection system Part 6 of IEC61850 defines the substation configuration language (SCL) for the engineering of IEC systems: Figure 4: Engineering workflow 4

5 SCL files are used to exchange data between different types of tools. Depending on the phase of the engineering work different kinds of SCL files are used. The System Specification Description (SSD) is used to specify the system by representing the Single Line diagram with allocated functions. The IED Capability Description (ICD) files describe the functions as they are implemented in the IED. Engineering is done, by (see Figure 5) instantiating IEDs based on their ICD files and (1) binding them together in a network.(system Configurator) defining the information flow from the IEDs by configuring Reports and GOOSE Messages The result of this process is the Substation Configuration Description (SCD). The SCD file is finally imported by the IED configurator (2) and used to configure the IEDs. The configuration of the IED from the IED configuration tool can be made by using either the standardized CID file or by using a proprietary format. Updates that have been made in the IED configurator can be imported by the system configuration using the IID file. While the ICD file is a template, the IID file contains the information of an already instantiated IED: Figure 5: Tool interaction (Image from IEC61850, edition 2) Signal Engineering begins at the blocks in the wiring cabinet and ends by displaying the information in the Station HMI. This is a wider scope than covered by IEC Thus a good integration of the different tools for IED, System and Station HMI engineering is crucial. 5

6 Figure 6: Integrated tool environment In this case study a prototype of an integrated tool environment (CeiX) is used. CeiX consists of StreamX StreamTools extended by an IEC system engineering tool. The IEC system engineering tool is based on HELINKS STS. IMPLEMENTING THE USE CASES The case study assumed a maintenance situation, where the station was delivered turnkey. Starting point of the engineering is the SCD file delivered by the supplier of the substation. Reverse Engineering has two steps: Loading the SCD file into CeiX. Extending the project with a Single Line diagram if not already available as part of the substation section of the SCD file; As a result of loading the SCD File CeiX produces a system diagram: Figure 7: CeiX System Diagram 6

7 The System Diagram is more than a drawing. It contains all the semantic information that is contained in the SCD File. The next step consists of drawing the corresponding Single Line and associating it to the IEDs. The Single Line Diagram is also based on SCL and can be used to produce an SSD File. Now the engineering environment is set up, so we can implement the use cases. We will use the SSD file so produced in a lab test environment. Adding a new feeder is done by the following steps: Preparing the feeder in the SCADA engineering (data structures and graphics for HMI). Adding the feeder in the Single Line (Copy/Paste) Adding the IED in the System Diagram and do the mapping between the information in the IED and the new feeder in the Single Line. Exporting SCD and HMI parameters from IEC61850 tool to the engineering tool for the SCADA system. Figure 8: CeiX Internal dataflow As a result the station HMI is updated with the new feeder and a new SCD file is available for configuring the IEDs. CeiX contains a function editor that allows to create the GOOSE Message for the Reverse Blocking function. The user uses a functional view to draw the signal from J14 to bay J01. Because IEDs have been assigned to the bays J14 and J01 CeiX is now able to implement automatically the signal flow in terms of Data Set, FCDA, GOOSE Message and external reference in the Input section (see Figure 9). A new SCD File is produced and can be imported by the IED Tool. 7

8 Figure 9: Implementing Reverse Blocking Signal Integration CONCLUSION The case study was performed on two real IEDs, as shown in Figure 1, and included the IED tools, the System Specification and Integration tool, the SCADA and Gateway tools and a copy of the HMI of La Veyre. The process described in the previous sections were implemented in this setup and were observed to yield correctly working Reverse Blocking functionality and the integration of the additional feeder element. The case study proved that with the new and forthcoming system integration tools based on the engineering process described in part 6 of the second edition of IEC61850, the engineering of IEC61850 systems is evolving from a black art towards an open technology that can be used by independent system integrators and utilities. IEC standards offer options for utilities for retrofitting and maintenance of equipment and provide value and flexibility during the lifetime of an installation. BIBLIOGRAPHY Ch. Brunner: "Migration approach from conventional SCADA database to a new IEC based information management platform"; PowerGrid 2009, May 26 28, 2009, Köln, Germany. Ch. Brunner: "IEC Process bus challenges and benefits", DistribuTECH 2009, February 3 5, 2009, San Diego, US. Ch. Brunner, K. Schwarz: Standardization of electric power delivery system, Praxis Profiline IEC 61850, August 2008, p Ch. Brunner: "IEC for power system communication", IEEE Transmission and Distribution Conference, April 21 24, 2008, Chicago, US. Ch. Brunner: The impact of IEC on protection, IET DPSP, March 17 19, 2008, Glasgow, UK.K.P. Brand, Ch. Brunner, I. de Mesmaeker: "How to use IEC in protection and automation?"; CIGRE Elektra, No 222, October 2005, p