Inverter Phase and Amplitude Compensation for High-Frequency Output
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Solution Overview
Problem
In voltage inverter systems, high-frequency output voltages suffer from phase and amplitude shifts due to limited system bandwidth, leading to distorted waveforms and significant errors between the output voltage and the intended voltage command.
Innovation Solution
A phase and amplitude improving method and system that involves establishing an inverter model, performing phase and amplitude compensation using dedicated controllers, and generating a compensating voltage command to minimize the difference between the actual and intended output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inverter operates at high frequency output voltage, then the productivity is improved, but the phase and amplitude of the output voltage are shifted causing waveform distortion and large error
Solution Approach 1:
The patent implements feedback control by computing the actual voltage information from the inverter model, comparing it with the voltage command, and generating compensating phase and amplitude information based on the computed differences. This closed-loop feedback mechanism continuously corrects the output voltage to maintain accuracy at high frequencies.
Solution Approach 2:
The patent changes the parameters of the voltage command by generating compensating phase and amplitude information. The phase controller and amplitude controller modify the original voltage command parameters (phase and amplitude) to compensate for the frequency-dependent distortions, allowing accurate high-frequency operation.
2Manufacturing precision
If phase and amplitude compensation is applied, then the manufacturing precision is improved, but the device complexity increases due to additional controllers and computation
Solution Approach 1:
The patent merges the phase control and amplitude control functions into a unified compensation framework. Both the phase controller and amplitude controller receive the same voltage command and actual voltage information, and their compensating outputs are combined to generate the final compensating voltage command, reducing overall system complexity.
Solution Approach 2:
The inverter model serves as an intermediary that computes the actual voltage information from the voltage command. This intermediary component enables the feedback mechanism by providing the necessary comparison data without requiring direct measurement of the physical output voltage, simplifying the control architecture.
Data Source
AI summary
A phase and an amplitude improving method includes performing a model establishing step, a phase compensating step, an amplitude compensating step and a compensation information generating step. The model establishing step includes establishing an inverter model. A voltage command is inputted to the inverter model to generate an actual voltage information. The voltage command includes a phase command information and an amplitude command information. The phase compensating step includes computing the phase command information and the actual voltage information to generate a compensating phase information. The amplitude compensating step includes computing the amplitude command information and the actual voltage information to generate a compensating amplitude information. The compensation information generating step includes generating a compensating voltage command. The compensating voltage command is inputted to the inverter model to generate a compensating actual voltage information.