Parallel Power Converter Current Distribution Optimization
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Solution Overview
Problem
Power converting systems driven in parallel with battery energy storage systems experience reduced efficiency at low-capacity operation, necessitating a method to optimize current distribution between multiple power converters for maximum efficiency.
Innovation Solution
A power converting system with two-way power converters connected in parallel, featuring a current control unit that adjusts the input currents to each converter based on efficiency comparisons between two modes, optimizing current distribution to maintain or switch between modes depending on efficiency ratios to achieve maximum power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If power converting systems operate in parallel with battery energy storage systems, then the system capacity and energy storage capability are improved, but the power efficiency deteriorates at low-capacity operation
Solution Approach 1:
The patent implements dynamic current distribution adjustment by continuously monitoring the operating state of parallel power converting devices and automatically optimizing current allocation. The control system dynamically modifies current distribution ratios based on real-time efficiency measurements, transforming the static current sharing into a dynamic adaptive process that maintains high efficiency across varying load conditions
Solution Approach 2:
The patent employs a feedback mechanism where the control unit measures the actual efficiency of each power converting device, compares it with reference values, and uses this information to adjust current distribution. This closed-loop control ensures that the system continuously operates at optimal efficiency points by feeding back performance data to the control unit for real-time parameter adjustment
2Ease of operation
If current distribution is fixed between parallel power converting devices, then the system operation is simplified, but the power efficiency deteriorates due to inability to optimize for varying load conditions
Solution Approach 1:
The patent enables the power converting system to self-optimize its current distribution by automatically monitoring its own operating parameters and adjusting current allocation without external intervention. The control unit autonomously determines the optimal current distribution ratio based on measured efficiency data, allowing the system to self-regulate and maintain high efficiency across different operating conditions
Data Source
AI summary
A power converting system and method of controlling the same disclosed. In one aspect, the power converting system includes first and second power converters electrically connected to each other, a current controller configured to determine first and second efficiencies of the power converting system, modify an amount of a first current configured to flow into the first power converter and an amount of a second current configured to flow into the second power converter in one of a first mode and a second mode, compare the first efficiency to the second efficiency, and determine the first mode or the second mode as a current adjustment mode based at least in part on the comparison result. The power converting system also includes a current distributor configured to distribute the amounts of the first and second currents based at least in part on the determined current adjustment mode.