Wide-Area Power System Protection Using Time-Aligned Synchrophasor Data
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Solution Overview
Problem
Existing wide-area power system protection and control systems require significant time (up to 700 milliseconds) to issue control or protection commands due to the need for data collection, storage, and processing across multiple intelligent electronic devices (IEDs) and central processing units, and they often necessitate a large number of IEDs and CPUs.
Innovation Solution
A system and method that uses remote and local IEDs to acquire, time-stamp, and time-align power system data, allowing for real-time automation, control, or protection operations by transmitting time-stamped data between IEDs and performing real-time processing using a synchrophasor real-time controller, which reduces the number of processing units and communication channels needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is collected, stored, and processed across multiple IEDs and central processing units, then system-wide protection and control is achieved, but the time required to issue commands increases to 700 milliseconds
Solution Approach 1:
The system divides the protection and control functionality into distributed IEDs that each perform local processing and can independently issue commands. Each IED is segmented to handle specific functions (protection, control, automation) rather than requiring centralized processing of all data, thereby reducing command issuance time while maintaining system-wide coverage
Solution Approach 2:
The IEDs pre-process and analyze power system data in real-time as it arrives, maintaining ready-to-execute protection logic and control algorithms. This preliminary action allows the system to issue commands immediately when conditions are met, eliminating the 700-millisecond delay associated with centralized data collection and processing
2Reliability
If multiple IEDs and central processing units are used for data processing, then comprehensive power system monitoring is achieved, but the number of devices and system complexity increases
Solution Approach 1:
Each IED is designed as a multi-functional device that can perform protection, control, automation, metering, and monitoring functions simultaneously. This universal design reduces the total number of devices needed compared to specialized devices for each function, while maintaining comprehensive power system monitoring capabilities through the coordinated operation of fewer, more capable units
Solution Approach 2:
The invention merges previously separate functions (protection relays, control systems, monitoring devices) into integrated IEDs that share common hardware resources including processors, memory, and communication interfaces. This consolidation reduces device count and system complexity while achieving the same comprehensive monitoring and control objectives through combined functionality
Data Source
AI summary
An apparatus, system and method in an electrical system using power system information or data associated therewith having a time component associated therewith sampled or obtained from the electrical system at a local and a remote location, wherein the local and remote data are time aligned and used to provide control, monitoring, metering, and/or automation to the electrical system. The local IED may be adapted to receive power system data from the remote IED, time align the local and remote synchronized power system data, and perform math operations on the local and remote power system data.