Voltage Source Converter With Integrated Switching Cell Inductors
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Solution Overview
Problem
Existing Voltage Source Converters face challenges in reducing complexity and size, especially when handling high powers and voltages, due to the need for a large number of switching cells connected in series, which increases size and complexity, and requires extensive filtering and harmonic current management.
Innovation Solution
The integration of inductors within the series connection of switching cells, allowing for modularization and elimination of phase reactors, thereby reducing the overall size and complexity of the converter, and enabling a more efficient design for high voltage and power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high number of switching cells are connected in series to handle high voltages and powers, then the converter can transmit high powers, but the size and complexity of the converter increases
Solution Approach 1:
The patent combines the inductor function with the switching cell structure by integrating inductance means into the series connection of switching cells. This merging eliminates the need for separate phase reactors, reducing the overall number of components and simplifying the converter design while maintaining high power transmission capability
Solution Approach 2:
The inductance means serve multiple functions: they provide the necessary inductance for high power transmission, act as part of the switching cell structure, and eliminate the need for separate filtering components. This multi-functionality reduces complexity while maintaining power handling capability
2Power
If a high number of switching cells are connected in series to handle high voltages and powers, then the converter can transmit high powers, but the size of the converter increases
Solution Approach 1:
By merging the inductor function into the switching cell structure, the patent eliminates separate phase reactors and filtering components, thereby reducing the overall volume of the converter while maintaining the ability to handle high powers through the series connection of switching cells
3Object-affected harmful factors
If traditional converter designs are used with separate phase reactors, then filtering requirements can be met, but the overall size and complexity increases
Solution Approach 1:
The patent extracts the inductor function from separate phase reactors and integrates it directly into the switching cell structure. This extraction and integration eliminates the need for separate filtering components while maintaining the ability to filter harmonic currents and radio interferences
Solution Approach 2:
The inductance means within the switching cells serve multiple functions including filtering harmonic currents, managing radio interferences, and providing the necessary inductance for power transmission, thereby reducing the need for separate filtering components and simplifying the overall design
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 results in a more compact and cost-effective converter design with reduced losses and filtering requirements, facilitating easier production and material handling, while maintaining the ability to produce sinusoidal alternating voltages with lower switching frequencies.
Implementation Method 1
said series connection of switching cells has inductance means, in this case inductors, connected to a terminal of this switching cell
Data Source
Figure 1
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Figure 5~6
AI summary
A Voltage Source Converter having at least one phase leg connected to opposite poles of a direct voltage side of the converter and comprising a series connection of switching cells has inductance means comprising a plurality of inductors (23) built in in said series connection of switching cells (7') and connected in series with these cells by being connected to terminals (14, 15) thereof.