Storage Battery System Frequency Control via SOC Allocation
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Solution Overview
Problem
Existing storage battery systems face challenges in efficiently managing high power frequency control in AC electrical power systems, leading to excessive battery capacity and impaired economic efficiency.
Innovation Solution
A storage battery system control method that combines a large capacity storage battery system and a high power storage battery system, using SOC values to allocate electrical power for frequency control, prioritizing discharging to large capacity batteries and charging to high power batteries, and transferring energy to maintain optimal depth ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity of the storage battery is increased to cope with high power frequency control requirements, then the power output capability is improved, but the economic efficiency deteriorates due to excessive battery capacity
Solution Approach 1:
The storage battery system is segmented into two distinct subsystems: a large capacity storage battery system for energy storage and a high power storage battery system for power delivery. This segmentation allows each subsystem to be optimized for its specific function, avoiding the need for a single oversized battery that would waste capacity for high-power applications.
Solution Approach 2:
The system transitions from a single-dimension battery sizing approach to a two-dimension approach by independently optimizing for both capacity (energy) and power dimensions. The large capacity system addresses the energy dimension while the high power system addresses the power dimension, allowing efficient coverage of both requirements without compromise.
2Device complexity
If a single storage battery system is used for both long-time large capacity operation and short-time high power operation, then the system simplicity is improved, but the operational flexibility deteriorates
Solution Approach 1:
The control system dynamically switches between the large capacity storage battery system and the high power storage battery system based on real-time operational requirements. This dynamic allocation allows the system to adapt flexibly to different operating modes (long-time large capacity vs. short-time high power) while maintaining a relatively simple physical structure.
Solution Approach 2:
The combined system achieves multi-functionality by integrating both large capacity and high power capabilities into a single frequency control system. The control apparatus universally manages both battery systems, enabling the system to perform both energy storage and power delivery functions efficiently.
Data Source
AI summary
A storage battery system control method includes at least the following steps. Respective current SOC (state of charge) values of the large capacity storage battery system and the high power storage battery system are acquired. Electrical power, which is required to operate the frequency control service for the purpose of suppressing frequency fluctuations, to the large capacity storage battery system and the high power storage battery system, in accordance with the respective SOC values. The respectively allocated electrical power is charged or discharged by driving the large capacity storage battery system, or alternatively, the high power storage battery system, or alternatively, the large capacity storage battery system and the high power storage battery system.