Analysis of IEC 61850-9-2LE Measured Values Using a Neural Network

Abstract

Process bus communication has an important role to digitalize substations. The IEC 61850-9-2 standard specifies the requirements to transmit digital data over Ethernet networks. The paper analyses the impact of IEC 61850-9-2LE on physical protections with (analog-digital) input data of voltage and current. With the increased interaction between physical devices and communication components, the test proposes a communication analysis for a substation with the conventional method (analog input) and digital method based on the IEC 61850 standard. The use of IEC 61850 as the basis for smart grids includes the use of merging units (MUs) and deployment of relays based on microprocessors. The paper analyses the merging unit's functions for relays using IEC 61850-9-2LE. The proposed method defines the sampled measured values source and analysis of the traffic. By using neural net pattern recognition that solves the pattern recognition problem, a relation between the inputs (number of samples/ms-interval time between the packets) and the source of the data is found. The benefit of this approach is to reduce the time to test the merging unit by getting the feedback from the merging unit and using the neural network to get the data structure of the publisher IED. Tests examine the GOOSE message and performance using the IEC standard based on a network traffic perspective.Reference [6] proposes solutions to integrate IEC 61850 communication with the meters and their communication interfaces. This work implemented a complete smart grid realized on the basis of IEC standards. As further discussed in this work, the number of integrated units that can be used for monitoring and control purposes in the power system is quite small, and that means that there is also need for developed techniques for data handling to achieve realize smart distribution [7].Research work has been presented in [8] analyzing the various communications options for scalable deployment of smart grid services. As stated in [8], the authors used the software-defined utility (SDU) concept to obtain automated management of the smart grid.Reference [9] focused on the communications capabilities in traditional protections with the ability to use other technologies like WiFi and 3G for signal communication in real time. Several research articles [10,11] have proposed methods to develop self-healing functionality in smart grids using IEC 61850.Reference [12] proposed a laboratory test bed for comparing the performance of digital, hybrid and traditional substations. The experiment focused on the hard in the loop test with traditional current and voltage-operated protection relays and with sampled measured values according to IEC 61850-9-2LE. The comparison found that the relay protection function performance is very similar to that of classical substations, with the advantage of the data transmission in digital form.Reference [13] focused on the configuration of IEC 61850 GOOSE service for easy implementation with electric protection systems; the authors proposed a...

Investigation of an IEC 61850 standard-based process bus implementation of a protection and control scheme for parallelly connected transformers

“…Researchers use different tools to analyse SVs (Bajanek and Sumec, 2016b). MUs can be used to produce SVs or test set like the OMICRON CMC 353 can be used to playback a record of an SV message (Wannous et al , 2019). The SV Analyser software and other software are used for verification and visualization of SVs (Bajanek, 2014; Sumec, 2014).…”

Hardware Development and Interoperability Testing of a Multivendor-IEC-61850-Based Digital Substation

“…In some papers, the authors developed a laboratory prototype testbed to validate their simulated models. The IEC 61850 communication network SMV messaging with IEC 61850-9-2 and GOOSE message transfer with its ETE delay have been studied using prototype testbed setups that have only single vendor devices [17,18]. To test the voltage and current sampled values, a grid fault was simulated using MATLAB software, and the author used a single vendor laboratory testbed to validate the results in [19].…”

Performance Analysis of Overcurrent Protection in a Digital Substation with Process Bus

“…In [20], the authors highlighted the importance of interoperability and the problems generated when implementing digital substations; they developed a multi-vendor interoperable testbed to evaluate the performance of protections and other equipment used in the electrical infrastructure. In [21], the authors implemented a process bus, GOOSE messages, and SVs for the protection relays; they examine GOOSE messages and the performance of protection relays.…”