Virtual Battery Partitioning for Concurrent Grid Services
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Solution Overview
Problem
Existing fixed energy storage (FES) systems are limited to providing a single service, as they operate like single power sources, which restricts their ability to offer multiple services simultaneously.
Innovation Solution
The method involves configuring a plurality of virtual energy storage devices within a single FES system, allowing these virtual devices to perform multiple grid services concurrently, thereby expanding the functionality of the FES system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an FES system is configured for providing back-up power, then it can provide reliable back-up power service, but it cannot provide any other services despite potentially having a very large power capacity
Solution Approach 1:
The FES system is configured to perform multiple grid services simultaneously through a control system that divides the energy storage device into multiple virtual energy storage devices. Each virtual device can be assigned to different services (back-up power, frequency regulation, energy arbitrage, etc.), allowing the single physical system to provide universal multi-functional service to the grid.
Solution Approach 2:
The control system segments the single energy storage device into multiple virtual energy storage devices, each capable of independently providing different grid services. This virtual segmentation allows the physical system to be divided into functional units that can operate simultaneously for different purposes without requiring multiple physical systems.
2Adaptability or versatility
If multiple smaller FES systems are deployed to provide multiple services, then service diversity is improved, but system complexity and coordination requirements increase
Solution Approach 1:
Multiple virtual energy storage devices are merged within a single physical FES system, allowing diverse grid services to be provided through one unified system rather than coordinating multiple separate physical systems. The control system manages all virtual devices and their service assignments centrally, reducing coordination complexity.
Solution Approach 2:
A single FES system is designed to universally provide multiple grid services through its virtual devices, eliminating the need for multiple specialized systems. The system can dynamically allocate its capacity across different services based on grid needs and economic conditions.
3Reliability
If the entire capacity of an FES is dedicated to a specific service, then service reliability is improved, but capacity utilization for other services is reduced
Solution Approach 1:
The allocation of FES capacity to different services is made dynamic rather than static. The control system can adjust the capacity assigned to each virtual energy storage device based on real-time grid conditions, service priorities, and economic signals, allowing the system to maintain reliability for critical services while optimizing overall capacity utilization.
Solution Approach 2:
The FES system allocates capacity partially to different services through virtual devices, allowing some overlap and flexibility in capacity assignment. This enables the system to provide reliable service for primary functions while maintaining available capacity for secondary services when needed.
Data Source
AI summary
Certain aspects of the present disclosure relate to virtualizing battery resources for grid service applications. In particular, some of these aspects provide a method for configuring a plurality of virtual energy storage devices in an energy storage device of a fixed energy storage system; and performing two or more grid services concurrently with two or more virtual energy storage devices of the plurality of virtual energy storage devices.