Load Modulation for Grid Ancillary Services
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Solution Overview
Problem
The power grid faces challenges in maintaining supply-demand balance due to the randomness of electric loads and uncertainty of generation, with existing solutions like batteries and flywheels being costly and inefficient for high-frequency regulation.
Innovation Solution
A framework that utilizes residential and commercial loads to provide ancillary services by modulating their power consumption in response to regulation signals, employing a probabilistic decision-making process to adjust the state of loads such as refrigerators, water heaters, and pool filtration systems, allowing for continuous and reliable grid support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional generators and storage solutions (batteries, flywheels) are used for high-frequency regulation, then grid stability can be maintained, but the cost increases and efficiency decreases
Solution Approach 1:
The invention enables loads to provide ancillary services to the grid using their own operational flexibility. Loads such as refrigerators, water heaters, and pool pumps modulate their power consumption based on regulation signals, effectively serving the grid's stability needs while maintaining their primary functions. This self-service approach eliminates the need for separate expensive storage solutions and improves overall system efficiency.
Solution Approach 2:
The invention transforms single-function loads into multi-functional elements that simultaneously perform their primary purpose (e.g., cooling, heating, filtration) and provide ancillary grid services through power modulation. This universal approach allows existing infrastructure to serve multiple purposes, reducing the need for additional specialized equipment like batteries and flywheels.
2Reliability
If traditional generators and storage solutions are used for high-frequency regulation, then grid stability can be maintained, but the cost increases
Solution Approach 1:
Loads provide ancillary services using their own operational flexibility rather than requiring separate paid infrastructure. By modulating power consumption based on regulation signals, loads generate value for the grid while maintaining their primary functions, eliminating the need for expensive batteries and flywheels.
Solution Approach 2:
The invention utilizes existing, inexpensive load infrastructure (refrigerators, water heaters, pool pumps) instead of expensive long-lived assets like batteries and flywheels. These loads are already present in millions of homes and businesses, providing a cost-effective resource for grid regulation that leverages existing capital investments.
3Adaptability or versatility
If loads modulate power consumption in response to regulation signals, then ancillary services are provided, but the complexity of control increases
Solution Approach 1:
Each load is equipped with a controller that autonomously determines whether to modify its power state based on the regulation signal and local conditions. This decentralized self-service control eliminates the need for complex centralized control systems, as each load independently makes decisions while contributing to overall grid stability.
Solution Approach 2:
The control system is segmented into independent load-level controllers rather than a monolithic centralized system. Each controller operates autonomously based on local conditions and the regulation signal, dividing the complex control task into manageable independent decisions that collectively achieve grid stability.
4Loss of energy
If loads with discrete finite states are used, then cost-effective control is achieved, but continuous power adjustment capability is limited
Solution Approach 1:
The invention merges the discrete control capabilities of individual loads with the collective behavior of load ensembles. While each load has limited discrete states (on/off, high/medium/low), the aggregation of many loads provides continuous power adjustment capability through probabilistic modulation, achieving both cost-effectiveness and adaptability.
Solution Approach 2:
The invention transitions from individual load control to ensemble-level control, adding a new dimension of aggregation. By controlling the probability of state transitions across many loads rather than continuously adjusting each individual load, the system achieves continuous effective power adjustment while maintaining simple discrete control at the device level.
Data Source
AI summary
A system, method and apparatus for providing ancillary services to a power grid using a power consumption component at a customer premises. The apparatus may control a load with discrete, finite states of power or an on/off load at a customer premises using a controller. The controller may comprise a processor, which may be configured to receive a regulation signal associated with an ancillary service for the power grid; determine whether to modify a state of power of the power consumption component based on a probability function, local measurement at the premises, and the received regulation signal; and based at least in part on a determination to modify the state of power of the power consumption component, modify the state of power of the power consumption component. The system may be distributed, with different controllers at different customer premises independently making power state decisions.