Switch Power Converter Self-Testing Frequency Response
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Solution Overview
Problem
Conventional frequency response analyzers struggle to test and adjust the frequency response characteristics of power converters, especially in high-power systems and systems with multiple paralleled converters, due to limitations in space and resources, and become less effective when the power system stability changes with new loads or grids.
Innovation Solution
A switch power converter with an integrated testing and adjusting unit, comprising a switch power unit, controller, detector, and compensator, which generates and responds to AC disturbing signals to measure and compensate the open-loop transfer function without external frequency response analyzing equipment, allowing self-measurement and compensation of frequency response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a frequency response analyzer is used to test the frequency response characteristic of the power converter, then the frequency response characteristic can be measured, but the analyzer becomes ineffective when the power system reaches MW level output power because the disturbance signal is ignored
Solution Approach 1:
The power converter performs self-testing by generating its own disturbance signal through the controller and measuring its own frequency response characteristics. The converter uses its internal controller to output disturbance signals and its own detector to measure the frequency response, eliminating the need for external frequency response analyzers that become ineffective at MW power levels.
2Productivity
If multiple power converters are paralleled in the power system, then the power system capacity increases, but the single stable power converter becomes unstable and the frequency response characteristic changes
Solution Approach 1:
The power converter uses feedback control by continuously measuring its frequency response characteristics through the detector and adjusting its control parameters accordingly. The controller modifies control parameters based on the measured frequency response to maintain system stability when multiple converters are paralleled or when load conditions change.
3Measurement precision
If a frequency response analyzer is connected to test the power converter, then the frequency response can be tested, but the disposing space and resources of the power system are consumed
Solution Approach 1:
The frequency response testing functionality is merged into the power converter itself. The controller and detector that are already part of the power converter are used to generate disturbance signals and measure frequency response characteristics, combining the power conversion function and the testing function into a single integrated system.
4Stability of the object's composition
If the frequency response characteristic of the power converter needs to be adjusted, then the power system stability can be maintained, but conventional testing methods become inconvenient when power system configurations change
Solution Approach 1:
The power converter automatically performs frequency response testing and adjustment without requiring external testing equipment. When power system configurations change, the converter independently measures its frequency response characteristics and adjusts its control parameters to maintain stability, eliminating the need for manual retesting with external analyzers.
Data Source
AI summary
A switch power converter and method of testing and adjusting is provided. A switch power unit comprises at least a power switch for transform of the power. A controller is configured to generate a control signal for the power switch. A detector is configured to detect an output voltage signal and/or an output current signal of the switch power unit and output a sampling signal. A testing and adjusting unit is configured to receive the sampling signal and output a testing signal to the controller. The testing and adjusting unit comprises a compensator. The compensator attends the testing and adjusting of the switch power converter. An AC disturbing signal various in frequency causes the difference in the sampling signal and the testing signal so as to test open-loop transfer function of the switch power converter, the compensator compensates frequency response characteristic of the switch power converter, when the frequency response characteristic of the switch power converter doesn't match a target frequency response characteristic.