DC Bus Stabilization via Segmented Power Converters
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Solution Overview
Problem
Existing direct current bus control systems face challenges in efficiently managing power fluctuations caused by renewable energy sources and load variations, leading to instability in direct current bus voltage.
Innovation Solution
A direct current bus control system comprising a main stabilizing device with a first charge-discharge element and power converter, and sub-stabilizing devices with second charge-discharge elements and power converters, which set and maintain bus voltage and current targets to balance power flow between the bus and storage devices, ensuring stable voltage and current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-capacity power converter with wide input range is used to maintain DC bus voltage within permissible range, then voltage stability is improved, but system size, complexity, and cost increase
Solution Approach 1:
The power converter is divided into multiple modular units (first power converter and second power converter) that can independently control different charge-&-discharge elements. This segmentation allows the system to achieve voltage stability through coordinated control of multiple smaller units rather than requiring a single large-capacity converter, thereby reducing overall system complexity and cost while maintaining reliability.
2Reliability
If conventional stabilization techniques are used, then power supply stability is partially improved, but efficiency in controlling power fluctuation caused by renewable energy output variation and load fluctuation deteriorates
Solution Approach 1:
The control system dynamically adjusts the charge-&-discharge operations of multiple energy storage elements based on real-time conditions. The first power converter controls the first charge-&-discharge element while the second power converter controls the second charge-&-discharge element, with both operating in coordination to adapt to varying renewable energy output and load conditions. This dynamic, multi-element approach significantly improves power fluctuation control efficiency compared to conventional single-mode stabilization techniques.
3Productivity
If multiple charge-&-discharge elements with coordinated control are implemented, then power fluctuation control efficiency is improved, but system complexity increases
Solution Approach 1:
Both the first and second power converters are designed with universal functionality to perform charge and discharge operations on their respective energy storage elements. This multi-functional design allows the same type of converter architecture to be reused multiple times with different configurations, standardizing the system and actually reducing overall complexity despite having multiple elements. The converters can adaptively switch between charging and discharging modes based on system needs.
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 system effectively controls power fluctuations, maintaining direct current bus voltage within a predetermined range and optimizing power distribution, reducing system size, complexity, and cost while enhancing stability and efficiency.
Implementation Method 1
the first power converter is configured to derive a bus voltage target value according to a power storage amount index of the first charge-&-discharge element, and to bidirectionally pass direct current power between the first charge-&-discharge element and the direct current bus
Implementation Method 2
the second power converter is configured to derive a current target value according to a difference between: a threshold value of charge or discharge of the second charge-&-discharge element, the charge element, or the discharge element; and the voltage of the direct current bus, and is configured to pass direct current power between: the second charge-&-discharge element, the charge element, or the discharge element; and the direct current bus
Data Source
AI summary
A direct current bus control system including a direct current bus connecting between an input power supply and a load, including a main stabilizing device including a first charge-&-discharge element and a first power converter, and at least one sub-stabilizing device including a second charge-&-discharge element, a charge element, or a discharge element, and including a second power converter, wherein the first power converter is configured to derive a bus voltage target value according to a power storage amount index of the first charge-&-discharge element, and to bidirectionally pass direct current power, so that the voltage of the direct current bus matches the bus voltage target value, and the second power converter is configured to derive a current target value, and to pass direct current power, so that a current equal to the current target value flows.