Islanded AGC Control via Segmentation and Frequency Feedback
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Solution Overview
Problem
Conventional automatic generation control (AGC) systems suspend operation during islanding conditions, leading to potential frequency imbalances and blackouts, as they are not designed to handle islanded operation effectively, requiring manual intervention and potentially worsening generation/load imbalances.
Innovation Solution
An enhanced energy management system that detects islanding conditions, divides the control area into isolation areas, assigns resources, enables automatic gain control, balances generation and load levels, and uses load frequency control to stabilize each island, allowing for smooth and stable operation during islanded conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional AGC systems suspend control during islanding detection, then dangerous and incorrect control of units is precluded, but generation/load imbalance worsens and frequency deviation increases
Solution Approach 1:
The control area is divided into multiple isolation areas based on the detected islanding conditions. Each isolation area is independently controlled with its own AGC function, allowing stable operation of islanded portions while preventing incorrect control of units that have been separated from the main interconnection.
Solution Approach 2:
The AGC system dynamically adapts its control strategy based on the detected islanding condition. When islanding is detected, the system transitions from conventional interconnection control to islanded operation control, adjusting control parameters and objectives to match the changed system topology and operational requirements.
2Measurement precision
If manual intervention is required to identify islanded generators, then control precision is maintained, but response time decreases and operational complexity increases
Solution Approach 1:
The AGC system automatically detects islanding conditions and performs self-identification of islanded generators through monitoring system frequency deviation and unit frequencies. The system autonomously divides the control area into isolation areas and assigns units to appropriate AGC functions without requiring manual operator intervention.
Solution Approach 2:
The system continuously monitors system frequency and unit frequencies, using this feedback to automatically detect islanding conditions. When frequency deviations exceed thresholds, the feedback mechanism triggers automatic island detection and initiates the isolation area division process.
3Reliability
If conventional AGC suspends control during islanding, then system safety is maintained, but control performance during islanded conditions deteriorates
Solution Approach 1:
The AGC system dynamically switches control modes based on operational conditions. During islanding, the system transitions from suspended control to active islanded operation control, maintaining system safety through automatic detection while improving control performance by applying appropriate control strategies for the islanded configuration.
Solution Approach 2:
By dividing the control area into isolation areas, the system enables controlled operation of islanded portions rather than complete control suspension. This segmentation allows AGC to maintain safety while providing active control performance in the isolated areas.
Data Source
AI summary
Embodiments provide systems, apparatus, and methods for power distribution during islanding conditions. Embodiments include power generating resources operating within a control area; power consuming loads; a power transmission network coupling the resources to the loads; and an energy management system in communication with the resources and configured to control operation of the resources within the control area. The energy management system is operative to divide the control area into a plurality of isolation areas in response to detecting that isolation areas have occurred within the control area, assign at least one of the resources to each of the isolation areas, disable operation of the control area, enable each of the isolation areas to operate as an island having automatic gain control, balance a generation level and load level for each isolation area, and use load frequency control to stabilize operation of each isolation area. Numerous additional aspects are disclosed.