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.
Highlights
Substations in energy systems use intelligent electronic devices (IEDs) that can share data in real-time, in order to use and share these data quickly and efficiently among the substation devices [1].Sharing data must be standardized as a communication standard
There are various methods thatof can be implemented to achieveunits the time synchronization in the whole testing system and between the merging units such as master-slave architecture for clock distribution among the power system, the time source according to IEC 61869 is required
Language (SCL) file is exported from the IED-publisher to CMC, the data set of the model contains two parameters, the goal is to find the link between the number of samples and interval time and determine which merging unit is sending the sampled measured values (SMVs) and help the subscriber IED to figure out the correct sender of sampled values
Summary
Substations in energy systems use intelligent electronic devices (IEDs) that can share data in real-time, in order to use and share these data quickly and efficiently among the substation devices [1]. The IEC 61850 standard unites the structure, requirements, and communication specifications that can be implemented during sharing of data among IEDs, the first announcement of the cooperation and creates a platform between the substation automation system (SAS) and the substations (IEC 61850 2003) [2]. 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. Reference [13] focused on the configuration of IEC 61850 GOOSE service for easy implementation with electric protection systems; the authors proposed an algorithm to achieve full implementation of the IEC 61850 instead of the hard wired network connection. Section 3: The IEC 61850 sampled measured values testing. We found a link between two parameters (number of samples/ms – interval time) and used to determine the publisher. 70%—validation 15%—testing 15%), the best validation was in epoch 23
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