Dynamic Power Grid Rating Using Phasors for Stability Limits

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Solution Overview

Problem

Existing power grids operate using static ratings that do not account for changing conditions, leading to unnecessary power rejection from renewable sources and increased transmission congestion.

Innovation Solution

A system and method for dynamic rating of power grids that determines thermal, angular, and voltage stability ratings in real-time using voltage and current phasors, allowing for optimal control of power flow and increased renewable energy draw without environmental parameter sensing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If static power ratings are used based on worst operating conditions, then reliability is improved by avoiding line overheating and node voltage collapse, but productivity deteriorates due to power transmission congestion and rejection of renewable sources

Engineering Contradiction:

Improvegrid stabilityVSAvoidpower transmission capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic rating systems that continuously update thermal, angular, and voltage stability ratings based on real-time grid conditions. The thermal rating module adjusts line ratings based on actual temperature and weather conditions, the angular stability module updates ratings based on system frequency and load conditions, and the voltage stability module adjusts ratings based on voltage measurements. This dynamic approach allows the grid to operate at higher capacities when conditions permit while maintaining reliability when conditions deteriorate.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operating parameters of power lines by adjusting ratings based on environmental parameters (temperature, wind speed, solar radiation) and operational parameters (load, frequency, voltage). The thermal rating uses environmental parameters to adjust temperature-based limits, while angular and voltage stability ratings use operational parameters to adjust stability-based limits, enabling flexible adaptation to changing conditions.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If static power ratings are used to ensure thermal stability, then temperature control is improved, but energy loss increases due to unnecessary power rejection

Engineering Contradiction:

Improveline temperatureVSAvoidrenewable energy rejection

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The thermal rating module implements feedback by continuously monitoring environmental parameters (temperature, wind speed, solar radiation) and adjusting line ratings accordingly. When environmental conditions are favorable (cooling effects), the system increases allowed power transmission, and when conditions are unfavorable, it reduces ratings to prevent overheating, thereby minimizing renewable energy rejection while maintaining thermal stability.

Inventive Principle:

Principle #23Feedback

3Stability of the object's composition

If static power ratings are used to maintain angular stability, then frequency synchronization is improved, but power transmission efficiency deteriorates

Engineering Contradiction:

Improveangular stabilityVSAvoidtransmission loss

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The angular stability module dynamically adjusts power ratings based on real-time system frequency and load conditions. When the grid operates under normal conditions with good frequency regulation, the system allows higher power transmission. When frequency deviations occur or load conditions change, the system adjusts ratings to maintain angular stability, thereby reducing unnecessary energy rejection while maintaining synchronization.

Inventive Principle:

Principle #15Dynamics

4Stability of the object's composition

If static power ratings are used to prevent voltage collapse, then voltage stability is improved, but adaptability deteriorates due to inability to account for changing grid conditions

Engineering Contradiction:

Improvevoltage stabilityVSAvoidresponse to changing conditions

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The voltage stability module implements feedback by continuously monitoring voltage measurements from the grid and adjusting power ratings in real-time. When voltage levels are stable and within acceptable ranges, the system allows higher power transmission. When voltage deviations are detected, the system adjusts ratings to prevent collapse, thereby maintaining voltage stability while adapting to changing grid conditions such as variable renewable generation and load patterns.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12470064B2Systems and methods for dynamic rating of power grids

Publication Date: 2025.11.11 GE VERNOVA INFRASTRUCTURE TECHNOLOGY LLC

AI summary

A system for dynamic rating of a power grid may include a plurality of terminal units, and a controller. The terminal units may detect a voltage phasor and a current phasor at nodes of the power grid. The controller may, based on the voltage phasors and the current phasors of the plurality of nodes, determine a dynamic thermal stability power rating for each line, a dynamic angular stability power rating for each node, and a dynamic voltage stability power rating for each node. The controller may, based on the dynamic thermal stability power rating, the dynamic angular stability power rating, and the dynamic voltage stability power rating, determine a dynamic system rating for the power grid. The controller may control the power grid in response to the dynamic system rating.