Energy Storage System Grid Service Prioritization Control
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Solution Overview
Problem
Energy storage systems face challenges in efficiently delivering multiple grid services simultaneously, as they typically respond to single grid services at a time, leading to inefficiencies in power demand management and state of charge reserve utilization.
Innovation Solution
A control system that categorizes grid service requests into priority tiers, determines aggregated power demands, and manages state of charge reserves to prioritize higher priority tier requests over lower ones, ensuring effective power delivery and reserve capacity management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If energy storage systems respond to single grid services at a time in modal fashion, then the system operation is simple and manageable, but the productivity and power utilization efficiency deteriorate
Solution Approach 1:
The patent segments grid services into different priority tiers (first priority, second priority, third priority) and divides the control process into separate modules: service categorization module, state of charge management module, and service aggregation module. Each module handles specific aspects of multi-service coordination, making the complex control task manageable through structured decomposition.
Solution Approach 2:
The control system dynamically adjusts power delivery based on real-time conditions by determining aggregated power demand for each priority tier and managing state of charge reserves dynamically. The system can shift power allocation between different service tiers based on current grid needs and energy storage state, enabling adaptive response to changing conditions.
2Productivity
If energy storage systems deliver multiple grid services simultaneously, then the productivity and revenue generation improve, but the reliability and service quality deteriorate due to potential degradation of primary services by lower priority requests
Solution Approach 1:
By segmenting services into priority tiers and implementing separate control modules for categorization, state of charge management, and aggregation, the system can independently manage each service category while maintaining overall coordination. This prevents lower priority services from degrading higher priority services through modular isolation.
Solution Approach 2:
The system performs preliminary categorization of grid services into priority tiers before power delivery, and pre-manages state of charge reserves to ensure higher priority services have sufficient energy availability. This advance planning prevents conflicts between services and maintains reliability of primary services.
3Loss of energy
If energy storage systems allocate power without priority tiers, then the ease of operation is maintained, but the loss of energy increases due to inefficient power demand management and reserve utilization
Solution Approach 1:
The control system is segmented into specialized modules that handle different aspects of energy management: service categorization for priority assignment, state of charge management for reserve optimization, and service aggregation for coordinated power delivery. This modular approach improves energy efficiency while keeping operations manageable through clear functional separation.
Solution Approach 2:
The system changes the parameter of power delivery by determining aggregated power demand for each priority tier and adjusting state of charge reserves based on priority levels. This parameter optimization enables efficient energy utilization by allocating power according to service priority and current system state.
Data Source
AI summary
Systems and methods for controlling an energy storage system to provide for delivery of multiple grid services are provided. Grid service requests can be categorized into a plurality of priority tiers. Power demands associated with the grid service requests can be allocated to enforce the prioritization scheme of the priority tiers. For instance, power demands associated with grid service requests in higher priority tiers can be given preference over power demands associated with grid service requests in lower priority tiers. Multiple grid service requests can be categorized within the same priority tier. In addition, the energy storage system can be controlled not only give priority to grid services requests categorized in the higher priority tiers, but also to manage the state of charge of the system to ensure that there is sufficient reserve capacity to meet power demands of the grid service requests categorized in the higher priority tiers.