Dynamic Power Grid Rating Using Real-Time Stability Limits
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Solution Overview
Problem
Existing power grids use static ratings that do not account for changing conditions, leading to inefficient power transmission and rejection of renewable energy sources.
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 and increased power draw from renewable sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static power ratings are used based on worst operating conditions, then system reliability is improved by avoiding line overheating and voltage collapse, but power transmission capacity deteriorates due to congestion and rejection of renewable sources
Solution Approach 1:
The patent applies dynamics by transitioning from static power ratings to dynamic power ratings that continuously adapt to changing grid conditions. The system calculates real-time thermal, angular, and voltage stability ratings based on current operating conditions, allowing the power transmission capacity to dynamically adjust rather than remaining fixed at conservative worst-case values.
Solution Approach 2:
The patent implements parameter changes by modifying the power rating parameters from fixed static values to dynamic values that change based on environmental conditions (temperature, wind speed), grid topology, and operational state. This allows the system to optimize power transmission capacity while maintaining reliability through continuous parameter adjustment.
2Device complexity
If static power ratings are used, then device complexity is reduced by avoiding real-time calculations, but adaptability deteriorates due to inability to account for changing grid conditions
Solution Approach 1:
The patent applies feedback by continuously monitoring grid conditions (voltage phasors, current phasors, environmental parameters) and using this feedback to update power ratings in real-time. The controller receives ongoing data from the power grid and adjusts the dynamic ratings accordingly, creating a closed-loop system that adapts to changing conditions.
Solution Approach 2:
The patent replaces traditional mechanical/static rating determination methods with computational/electronic systems that perform real-time calculations. Instead of using fixed mechanical ratings, the system uses digital processing to compute dynamic thermal, angular, and voltage stability ratings based on incoming sensor data and grid state.
3Productivity
If dynamic power ratings are implemented in real-time, then power transmission capacity is improved by reducing congestion and increasing renewable energy utilization, but measurement precision requirements increase due to need for accurate voltage and current phasor detection
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationships between voltage/current phasors and power ratings. The system has pre-established the mathematical models and calculation frameworks for thermal, angular, and voltage stability ratings, so when real-time measurements are taken, the system can quickly compute accurate dynamic ratings without requiring excessive measurement precision beyond standard phasor measurement capabilities.
Data Source
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.