Energy Storage State Estimation Using Single Sensor Equivalent Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Complex energy systems with multiple electrical storage devices face challenges in accurately estimating states such as State-of-Power (SOP), State-of-Charge (SOC), State-of-Health (SOH), and State-of-Life (SOL) due to the complexity of monitoring and modeling these systems with existing technologies.
Innovation Solution
A model-based approach using a linear equivalent circuit and nonlinear element models, integrated into an electronic controller, allows for state estimation of energy storage systems with a single current and voltage sensor, enabling simplified hardware implementation and accurate determination of system states across various energy storage configurations, including batteries and supercapacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to monitor each storage device individually, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple storage devices (batteries and supercapacitors) into a single equivalent circuit model with aggregated voltage and current measurements. Instead of using separate sensors for each device, the system uses a single voltage sensor and a single current sensor to monitor the entire hybrid energy storage system, reducing hardware complexity while maintaining state estimation accuracy through the equivalent circuit modeling approach.
Solution Approach 2:
The equivalent circuit model serves multiple functions simultaneously: it represents the electrical characteristics of different storage devices, enables state estimation for the entire system, and allows individual device state calculation from aggregate measurements. The model acts as a universal framework that handles both batteries and supercapacitors with a unified mathematical representation.
2Measurement precision
If complex modeling approaches are used for each storage device, then state estimation accuracy improves, but device complexity increases
Solution Approach 1:
The patent segments the hybrid energy storage system into distinct electrical circuit representations for batteries and supercapacitors within the equivalent circuit model. Each storage device type is represented by its own circuit branch with appropriate parameters, allowing the complex system to be broken down into manageable segments that can be analyzed independently while maintaining overall system accuracy.
Data Source
AI summary
A number of variations may include products and methods for estimating the state of an energy system. At least one sensor may monitor a voltage and a current of the energy storage system. An electronic controller may be communicatively coupled with the energy storage system and may receive input from the sensor. A circuit may be representative of the energy storage system and may be appropriately defined in the electronic controller. The circuit may estimate a state of the energy storage system from a reading of the voltage and the current.