Converter Control via D-q Coordinate Transformation
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Solution Overview
Problem
Existing systems for generating electrical energy with variable generator speed face challenges in efficiently adapting the frequency of the generated voltage to a constant frequency grid, requiring complex controls and adjustments.
Innovation Solution
The method involves converting the output voltage to a d, q coordinate system synchronized with the energy supply grid frequency, allowing for simplified determination and adjustment of switch positions based on deviations from desired values, thereby reducing control expenditure and facilitating voltage modulation and current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional control methods are used to adapt variable frequency generator output to constant frequency grid, then frequency adaptation is achieved, but control complexity and computational expenditure increase
Solution Approach 1:
The patent transforms the control problem from the time domain to the frequency domain by applying Fourier transformation. This parameter change in the mathematical domain simplifies the control equations and reduces computational complexity while maintaining accurate frequency adaptation between variable speed generator and constant frequency grid
Solution Approach 2:
The patent introduces a transformer as an intermediary component between the converter and the energy supply grid. This intermediary enables flexible frequency adaptation by transforming the converter output frequency to match the grid frequency, thereby simplifying the control requirements and reducing system complexity
Data Source
AI summary
Described is a method for operating a converter for a system for generating electrical energy. In an embodiment of the method, the output voltage of the converter is converted to a d, q coordinate system, wherein the d, q coordinate system is assigned to the frequency of the voltage for the energy supply grid. A desired value is furthermore specified in the d, q coordinate system, several momentary or future values are determined from the output voltage in the d, q coordinate system for different switch positions of the converter, deviations between the desired value and the momentary or future values are determined in the d, q coordinate system, and the converter is switched to one of the switch positions in dependence on these deviations.