Battery Energy Storage System Dynamic Converter Control
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Solution Overview
Problem
Current power supply systems using Battery Energy Storage Systems (BESS) face inefficiencies in power conversion due to uniform power supply from electricity generation devices, leading to suboptimal use of DC/AC converters and increased Total Harmonic Distortion (THD), especially with fluctuating natural energy sources like solar and wind power.
Innovation Solution
A power supply system that includes multiple DC/AC converters and a system control unit to dynamically adjust the number of driven converters based on power supply conditions, charging the BESS directly from the electricity generation device without going through converters, and selectively driving converters to maintain 70-90% rated power usage for efficient energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electricity generation devices supply power uniformly through DC/AC converters, then power can be supplied to the system, but power conversion efficiency decreases and Total Harmonic Distortion increases
Solution Approach 1:
The system dynamically adjusts the number of driven DC/AC converters based on real-time power supply conditions. The system control unit monitors the power output from electricity generation devices and selectively activates the appropriate number of converters to match the power availability, preventing inefficient operation and reducing harmonic distortion.
Solution Approach 2:
The system changes the operational parameters of DC/AC converters by adjusting the number of active converters based on power supply conditions. When power supply fluctuates, the system modifies which converters are driven and at what capacity, optimizing conversion efficiency and minimizing harmonic distortion generation.
2Reliability
If multiple DC/AC converters are always driven to meet power demand, then power supply reliability improves, but power conversion efficiency decreases due to suboptimal operating conditions
Solution Approach 1:
The system dynamically determines the optimal number of DC/AC converters to drive based on the power supply conditions from electricity generation devices. The system control unit continuously monitors power availability and adjusts the number of active converters, ensuring reliable power supply while maintaining each converter at an optimal operating point for maximum efficiency.
Solution Approach 2:
Instead of always driving all converters at full capacity, the system applies partial action by selectively driving only the necessary number of converters based on actual power demand and supply conditions. This prevents over-operation of converters and maintains them within optimal efficiency ranges.
3Adaptability or versatility
If DC/AC converters operate outside 70-90% rated power range, then power supply flexibility increases, but conversion efficiency decreases and THD increases
Solution Approach 1:
The system maintains converter operating parameters within the optimal 70-90% rated power range by dynamically adjusting the number of active converters. When power supply conditions change, the system modifies the configuration of driven converters to ensure each operates within the efficient range, balancing adaptability with efficiency.
Solution Approach 2:
The system control unit monitors power supply conditions and converter performance in real-time, using feedback to adjust the number of driven converters. This closed-loop control ensures converters operate within the optimal efficiency range while adapting to varying power supply conditions from renewable sources.
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
This approach enhances power conversion efficiency, reduces THD, and improves power quality by optimizing the use of DC/AC converters based on real-time power demand and supply conditions, even with fluctuating renewable energy sources.
Implementation Method 1
a battery energy storage system (BESS) configured to receive and charge the electrical energy and supplies the electrical energy to the plurality of DC/AC converters by discharging the charged electrical energy
Implementation Method 2
a plurality of DC/AC converters configured to convert the electrical energy into AC
Data Source
AI summary
A power supply system includes: an electricity generation device configured to generate electrical energy; a plurality of DC/AC converters configured to convert the electrical energy into AC; and a battery energy storage system (BESS) configured to receive and charge the electrical energy and supplies the electrical energy to the plurality of DC/AC converters by discharging the charged electrical energy. The electrical energy generated by the electricity generation device charges the BESS without going through the plurality of DC/AC converters.