IEC 61850 Teleprotection IED Configuration via Link Definition
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Solution Overview
Problem
Current methods for transmitting teleprotection commands between distant substations in electric power utility networks face challenges in maintaining low transmission delay and signal semantics, especially when Substation Configuration Description files are not available, complicating the interchange of information between different personnel and equipment.
Innovation Solution
A method and tool for engineering inter-substation teleprotection functionality that generates IED Capability Description files based on a link definition, ensuring consistent configuration of teleprotection IEDs and protection relays, independent of Substation Automation system engineering, using an IED Capability Description generation module to create matching files for both substations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If teleprotection commands are transmitted over WAN using IEC 61850 MMS or GOOSE protocols, then communication can be established without dedicated point-to-point links, but transmission delay increases and may exceed the critical threshold of a few milliseconds to 10 ms
Solution Approach 1:
The patent segments the communication functionality by introducing a dedicated teleprotection communication path that operates independently from the standard IEC 61850 MMS/GOOSE protocols. This segmentation allows time-critical teleprotection commands to be transmitted through a specialized channel that guarantees low latency, while non-time-critical communication can use the standard protocols, thus resolving the contradiction between protocol flexibility and transmission delay.
Solution Approach 2:
The patent introduces an intermediary teleprotection communication mechanism that mediates between the IEC 61850 substation automation system and the wide-area network. This intermediary layer ensures that teleprotection commands receive prioritized handling with guaranteed transmission timing, preventing the delay issues that would occur if standard IEC 61850 protocols were used directly over WAN without specialized handling.
2Manufacturing precision
If Substation Configuration Description files are required for configuring teleprotection IEDs, then configuration accuracy can be ensured, but the configuration process becomes complex and requires coordination between different personnel and equipment teams
Solution Approach 1:
The patent applies preliminary action by pre-defining teleprotection communication parameters and capabilities in the IED Capability Description files before the Substation Configuration Description files are created. This allows the teleprotection IED configuration to be prepared independently in advance, eliminating the need to wait for coordination with substation automation teams and simplifying the overall configuration process while maintaining accuracy through pre-validated capability descriptions.
Solution Approach 2:
The patent extracts the teleprotection-specific configuration requirements from the overall Substation Configuration Description process by using separate IED Capability Description files. This extraction isolates the teleprotection configuration tasks, allowing them to be completed independently without requiring the full SCD file generation process, thus reducing complexity while preserving configuration accuracy through dedicated teleprotection parameter definitions.
3Reliability
If conventional teleprotection equipment is used for inter-substation communication, then proven reliability can be maintained, but integration with IEC 61850 substation automation systems becomes difficult due to different configuration requirements
Solution Approach 1:
The patent achieves universality by designing the teleprotection IED to support multiple communication modes: it can operate with conventional point-to-point teleprotection protocols for reliable dedicated links, and simultaneously support IEC 61850 protocols for integration with substation automation systems. This multi-functionality allows the same equipment to maintain proven reliability through conventional methods while also providing adaptability for modern IEC 61850-based integrated environments.
Data Source
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AI summary
The present invention is concerned with a teleprotection system engineering process that starts with the generation of a description of two teleprotection Intelligent Electronic Devices (IEDs) (15,25) at two substations (10,20) connected via a teleprotection link (300), based on the intended functionality or semantics to be transferred between the substations and the needed telecommunication properties for this semantics. A corresponding teleprotection link definition (301) is used as a unique input for a co-generation of two IED Capability Description (ICD) files (TP_IED_A.ICD;TP_IED_B.ICD) representing the two teleprotection IEDs or IEC 61850 gateways. A single ICD generation module or function block (160) performs this task thus reducing the possibilities for erroneous manual input of the link definition data. The generation of the two ICD files occurs prior to, and hence independently of, any generation of Substation Configuration Description (SCD) files, i.e. before a detailed Substation Automation (SA) system engineering actually takes place.