V2G Battery Controller SOC Range Management
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Solution Overview
Problem
The existing charge and discharge control methods for electric vehicle storage batteries in V2G systems prioritize spinning reserve over frequency regulation, leading to battery deterioration and inefficient incentive compensation, affecting electric power quality.
Innovation Solution
A power storage device with a controller that manages charge and discharge based on state of charge (SOC) ranges, prioritizing short-term switching for frequency regulation and continuous discharge for spinning reserve, while setting SOC limits to minimize battery deterioration and optimize incentive earnings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage battery performs continuous discharge for spinning reserve, then the electric power system stability is improved, but the storage battery deteriorates due to frequent switching for frequency regulation
Solution Approach 1:
The patent changes the control parameter from binary (charge/discharge) to continuous state-of-charge (SOC) range management. By defining different SOC ranges for spinning reserve (higher SOC) and frequency regulation (lower SOC), the system optimizes battery usage patterns to reduce deterioration while maintaining grid stability.
Solution Approach 2:
The patent segments the SOC range into distinct zones: a first SOC range for spinning reserve operations and a second SOC range for frequency regulation operations. This segmentation allows the controller to selectively engage different operational modes based on current SOC levels, reducing unnecessary switching and extending battery life.
2Reliability
If the storage battery prioritizes spinning reserve discharge, then the electric power system stability is improved, but the incentive efficiency is reduced due to missed frequency regulation opportunities
Solution Approach 1:
The patent implements dynamic control that adapts the battery's operational mode based on real-time SOC levels. The controller continuously monitors SOC and transitions between spinning reserve and frequency regulation modes as SOC crosses threshold values, maximizing incentive earnings while ensuring system stability is maintained through appropriate mode selection.
Solution Approach 2:
The patent utilizes SOC as a dynamic parameter to switch between operational modes. By setting threshold values within the SOC range, the system automatically transitions between spinning reserve and frequency regulation, optimizing the balance between system stability and incentive efficiency without manual intervention.
3Productivity
If the storage battery performs frequent switching for frequency regulation, then the incentive efficiency is improved, but the storage battery deteriorates faster
Solution Approach 1:
The patent transforms the control strategy by using SOC range thresholds to gate frequency regulation operations. Frequency regulation is only permitted when SOC is within the second range, preventing excessive cycling at critical SOC levels and reducing battery deterioration while maintaining incentive efficiency through optimized switching patterns.
Solution Approach 2:
The patent applies partial action by limiting frequency regulation to specific SOC ranges rather than allowing it at all times. This selective engagement reduces the total number of switching cycles and their impact on battery life, while still capturing sufficient incentive opportunities to maintain economic viability.
Data Source
AI summary
A power storage device includes a storage battery capable of transferring electric power to and from an external electric power network, a receiver configured to receive an instruction related to transfer of the electric power, and a controller configured to control charge and discharge of the storage battery according to the instruction. The instruction includes a first instruction for requesting switching between short-term charge and discharge from the storage battery to the electric power network, and a second instruction for requesting continuous discharge from the storage battery to the electric power network. The instruction allowed by the controller varies depending on a variable representing a state of charge of the storage battery by a level of a value.