DC Transformation System Series Compensation Voltage Control
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Solution Overview
Problem
Conventional DC transformation systems lack the ability to adjust DC voltage and tend to increase in size due to the limitations of diode rectifiers, which cannot respond to voltage changes effectively, especially under increased load conditions.
Innovation Solution
A DC transformation system comprising a rectifier, a first power conversion device connected in series, a second power conversion device connected in parallel, and a control device that adjusts the voltage by controlling the series compensation device to maintain a predetermined voltage, allowing for voltage adjustment and reducing the capacity of semiconductor elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a diode rectifier is used for DC transformation, then the system cost is reduced, but the DC voltage cannot be adjusted and adversely reduces with increase of load
Solution Approach 1:
The patent combines a diode rectifier with a series compensation device to create a hybrid system. The diode rectifier handles the basic rectification function while the series compensation device provides voltage adjustment capability, merging the simplicity of diode rectification with the adaptability of active power conversion.
Solution Approach 2:
The series compensation device acts as an intermediary between the diode rectifier and the load. It compensates for voltage drops caused by reactor impedance and enables DC voltage adjustment without requiring the diode rectifier itself to have adjustment capability.
2Reliability
If a power conversion device is connected in parallel to compensate output capacity, then the voltage response capability is improved, but the system size increases
Solution Approach 1:
The patent merges the compensation function into a series-connected device rather than using a separate parallel power conversion device. This series compensation approach provides voltage support and response capability while avoiding the need for large parallel compensation capacity.
3Stability of the object's composition
If the capacity of power conversion device is increased to always respond to voltage, then the voltage stability is improved, but the system size and cost increase
Solution Approach 1:
The series compensation device dynamically adjusts its output to match the actual voltage drop requirements. Rather than being sized for worst-case conditions, it provides just enough compensation to maintain voltage stability, reducing overall system size while maintaining performance.
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 system effectively stabilizes the voltage between terminals, reduces the size of the DC transformation system, and allows the use of inexpensive diode rectifiers without high-frequency current flow, decreasing the capacity requirements of semiconductor elements.
Implementation Method 1
a rectifier that rectifies AC power supplied from an AC power source and that outputs a first DC voltage
Data Source
AI summary
According to the present embodiment, a DC transformation system includes a rectifier, a first power conversion device, a second power conversion device, and a control device. The rectifier rectifies AC power supplied from an AC power source and outputs a first DC voltage. The first power conversion device is connected in series to the rectifier and outputs a second DC voltage. The second power conversion device is connected in parallel to the rectifier and converts power supplied from the rectifier to supply the converted power to the first power conversion device. The control device controls the first power conversion device to cause an addition/subtraction voltage of the first DC voltage and the second DC voltage to be a predetermined voltage.