Distributed Power Management via IED Load Shedding
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Solution Overview
Problem
Current load shedding systems in power management are centralized, leading to single-point failures and excessive load shedding to ensure system stability, as they rely on a single process controller for power balance calculations, which can result in unavailability during outages and inefficient load management.
Innovation Solution
A distributed power management system where intelligent electronic devices (IEDs) communicate and coordinate through a network to identify power imbalances and issue load shed commands based on power balance calculations, using IEC61850 standards and GOOSE communication profiles, allowing for decentralized load shedding and improved system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized load shedding control is implemented using a single process controller, then system stability is maintained through centralized power balance calculations, but system availability deteriorates due to single-point failures and excessive load shedding occurs to ensure stability
Solution Approach 1:
The patent divides the centralized load shedding control into distributed control units ( Intelligent Electronic Devices - IEDs) located at different substations. Each IED independently performs power balance calculations for its local area, eliminating the single-point failure risk of centralized control while maintaining system-wide stability through coordinated operation among multiple segmented control entities.
2Reliability
If distributed load shedding control is implemented across multiple IEDs, then system availability is improved by eliminating single-point failures, but communication complexity increases through network coordination requirements
Solution Approach 1:
The patent implements feedback mechanisms where each IED continuously monitors local power conditions (generation, load, frequency) and exchanges status information with neighboring IEDs through the communication network. This feedback loop enables coordinated load shedding decisions across the distributed system, maintaining reliability while managing communication complexity through structured information exchange protocols.
3Reliability
If excessive load shedding is implemented to ensure system stability in centralized control, then system stability is maintained, but energy loss increases due to unnecessary load disconnection
Solution Approach 1:
The patent enables each distributed IED to perform local power balance calculations based on its specific local conditions (local generation capacity, local load characteristics, local frequency deviations). This local quality approach allows precise, condition-specific load shedding decisions rather than uniform excessive shedding, maintaining system stability while minimizing unnecessary energy loss through localized intelligent control.
Data Source
AI summary
A method and system for distributed power management with individual IEDs in a substation are disclosed. An exemplary technique can include providing multiple IEDs in a power network in the substation and integrating an intrinsic load shedding function in each IED. The technique can include identifying a power imbalance state at an individual IED and load shedding the individual IED using an intrinsic load shedding function when a power imbalance state is identified in a coordinated manner to achieve distributed power management in the substation.