Compressed Air Energy Storage SOC Regulation
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Solution Overview
Problem
Compressed air energy storage (CAES) power generation devices lack optimization of State Of Charge (SOC) management, leading to inefficient operation of compressors and expanders, and inability to respond to new charge or discharge commands effectively.
Innovation Solution
A CAES power generation device with a compressor, pressure accumulation units, an expander, heat exchangers, SOC detection and regulation units, and a control device to maintain the SOC within an optimal range, utilizing heat storage and additional pressure accumulation units to regulate SOC and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CAES power generation device operates without SOC optimization, then the device can respond to charge/discharge commands, but the operating efficiency of the compressor and expander deteriorates
Solution Approach 1:
The system performs preliminary actions by detecting SOC in advance and regulating it to an optimal range before charge/discharge operations. The SOC detection unit continuously monitors the compressed air storage state, and the regulation unit adjusts SOC proactively to ensure optimal operating conditions are met before commands are executed, preventing efficiency deterioration.
Solution Approach 2:
The system implements feedback control by continuously detecting SOC and using this information to regulate the compressed air storage state. The SOC detection unit provides real-time feedback on the storage state, and the regulation unit adjusts operations based on this feedback to maintain SOC within the optimal range, thereby ensuring high operating efficiency.
2Adaptability or versatility
If the CAES power generation device operates without SOC regulation, then the device structure remains simple, but the ability to respond to new charge/discharge commands deteriorates
Solution Approach 1:
The SOC detection unit continuously monitors the compressed air storage state and provides feedback to the control system. This real-time information enables the system to adaptively respond to new charge/discharge commands by assessing the current SOC and adjusting operations accordingly, significantly improving command response capability.
Solution Approach 2:
The system dynamically adjusts operations based on real-time SOC conditions. The regulation unit can flexibly switch between different operational modes (charging, discharging, maintaining optimal SOC) depending on the detected SOC level and incoming commands, enabling adaptive response to varying operational requirements.
3Productivity
If the CAES power generation device uses SOC optimization, then operating efficiency improves, but the device complexity increases due to additional components
Solution Approach 1:
The SOC detection unit serves multiple functions: it monitors compressed air storage state, determines optimal operating conditions, and provides feedback for regulation. The regulation unit also performs multiple roles including adjusting SOC, coordinating with heat exchangers, and managing charge/discharge operations. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The SOC detection and regulation functions are integrated into the existing control architecture of the CAES system. The control device combines SOC management with overall system control, and the regulation unit coordinates with existing components like heat exchangers and compressors, merging multiple control functions into a unified system rather than adding completely separate subsystems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device operates within an optimal SOC range, enhancing the efficiency of power generation and enabling effective response to fluctuating renewable energy sources by regulating SOC, thereby improving operating efficiency and power management.
Implementation Method 1
a first heat exchanger that exchanges heat between a heat medium and the compressed air supplied from the compressor to the first pressure accumulation unit
Implementation Method 2
a second heat exchanger that exchanges heat between the heat medium and the compressed air supplied from the first pressure accumulation unit to the expander
Data Source
AI summary
A compressed air energy storage power generation device equipped with: a compressor mechanically connected to a motor; a first pressure storage tank storing compressed air from the compressor; an expansion device driven by compressed air from the tank; a generator mechanically connected to the expansion device; a first heat exchanger that exchanges heat between a heat medium and the compressed air supplied from the compressor to the tank; a second heat exchanger that exchanges heat between the heat medium and the compressed air supplied from the tank to the expansion device; a pressure sensor that detects the state of charge (SOC) of the tank; SOC adjustment units that adjusts the SOC; and a control device. The control device controls the SOC adjustment units such that the detected SOC is within an optimal SOC range while satisfying the requested power. Thus, in this compressed air energy storage power generation device the SOC is controlled so as to be within an optimal SOC range, so the operating efficiency can be improved.