Load Aggregation Controller for Grid Frequency Regulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electrical power grid management systems incur substantial overhead costs and energy waste due to the need for ancillary generators and energy storage devices to maintain frequency control, as they require construction, maintenance, and scheduling, which can be inefficient and costly, especially when dealing with unpredictable load swings.
Innovation Solution
A method of grouping loads into aggregations based on their electrical power draw characteristics and generating a best-fit dispatch signal to match desired load responses, using historical AGC signal data, weather forecasts, and daily/seasonal cycles, to optimize frequency regulation through direct load control, thereby reducing the reliance on ancillary generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ancillary generators are used for frequency control, then frequency regulation is maintained, but overhead costs and energy waste increase substantially
Solution Approach 1:
The patent enables loads to control themselves through automated dispatch signals. The load aggregation controller automatically adjusts individual load operation based on aggregate load predictions and grid frequency needs, eliminating the need for manual control or ancillary generators. Each load serves itself by responding to dispatch signals that optimize overall system frequency regulation.
Solution Approach 2:
The patent extracts the frequency control function from dedicated ancillary generators and transfers it to the load population itself. By removing the need for separate frequency control devices and embedding control capabilities within the load management system, the invention eliminates substantial overhead costs while maintaining frequency regulation through intelligent load dispatching.
2Reliability
If ancillary generators are scheduled ahead of time, then frequency control capacity is secured, but flexibility to handle unexpected load swings is reduced
Solution Approach 1:
The patent implements dynamic load dispatching where the aggregate load controller continuously adjusts dispatch signals to individual loads based on real-time grid frequency conditions and updated load predictions. This dynamic adjustment capability allows the system to adapt flexibly to unexpected load swings while maintaining secured frequency control capacity through automated real-time optimization.
Solution Approach 2:
The system uses feedback from grid frequency measurements and load aggregation predictions to continuously optimize dispatch signals. The load aggregation controller receives frequency data, compares it with target frequency, and adjusts individual load operation accordingly, enabling the system to respond adaptively to both scheduled and unexpected load variations.
3Reliability
If frequency response loads are used, then frequency regulation is improved, but control reliability is reduced due to decentralized nature
Solution Approach 1:
The patent merges the control functions of numerous decentralized frequency response loads into a unified load aggregation controller. This central coordination layer aggregates individual load responses, generates optimized dispatch signals, and ensures reliable frequency regulation by coordinating all loads as a unified controllable resource rather than independent decentralized units.
4Adaptability or versatility
If direct load control is implemented, then ancillary generator dependency is reduced, but system complexity increases
Solution Approach 1:
The patent segments the load population into manageable aggregations based on electrical characteristics, allowing each aggregation to be controlled independently with tailored dispatch signals. This segmentation reduces system complexity by breaking down the overall control problem into smaller, more manageable units while still achieving comprehensive frequency regulation across the entire load population.
Data Source
AI summary
In a direct load control system supporting frequency control of an electrical grid, loads are grouped into a plurality of load aggregations based on electrical power draw characteristics of the loads, e.g. power draw magnitude characteristic and transient slew rate. A best-fit dispatch signal is generated for each load aggregation to match a desired load response with a sum of predicted load responses of the aggregations each operating in accord with its best-fit dispatch signal. For each load aggregation, its best-fit dispatch signal is communicated to the loads of the load aggregation, and the loads of the load aggregation are operated in accord with the best-fit dispatch signal communicated to the loads. The desired load response may be generated based on historical Automatic Generation Control (AGC) signal data and at least one of (1) a weather forecast and (2) daily, weekly, and seasonal cycles.