Matrix Converter Voltage Command Correction for Input Current Distortion
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Solution Overview
Problem
Existing matrix converter technologies experience input current distortion when operating in a saturation area due to output voltage distortion, which is not effectively mitigated by multiplying the output voltage command by a gain.
Innovation Solution
A matrix converter system that includes a power converter and a controller with a voltage command generator, voltage command corrector, and drive signal generator, which corrects the output voltage command based on input current amplitude variations caused by ripple components, thereby reducing input current distortion by adjusting the output voltage amplitude accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the output voltage command is multiplied by a gain in the saturation area, then the input current increase is moderated, but the input current becomes distorted due to output voltage distortion
Solution Approach 1:
The patent introduces a feedback mechanism where the detected input current is processed to extract ripple components, which then feed back to correct the output voltage command. This closed-loop feedback system dynamically adjusts the output voltage to compensate for ripple effects, resolving the contradiction between moderating input current increase and preventing input current distortion
Solution Approach 2:
The patent performs preliminary correction of the output voltage command by subtracting ripple components before the voltage is applied to the load. By anticipating and removing ripple effects in advance, the system prevents input current distortion before it occurs, rather than reacting to it afterward
2Power
If the output voltage is increased in the saturation area, then the output voltage magnitude increases, but the input current amplitude increases with distortion
Solution Approach 1:
The patent introduces an intermediary processing stage between the output voltage command generation and the actual voltage application. This intermediary stage detects input current, extracts ripple components, and uses them to correct the output voltage command, thereby mediating between high output voltage requirements and low input current ripple requirements
Solution Approach 2:
The patent dynamically changes the output voltage command parameter by adjusting it based on detected input current ripple characteristics. This parameter modification allows the system to maintain high output voltage magnitude while compensating for ripple effects that would otherwise cause input current distortion
Data Source
AI summary
A matrix converter according to an embodiment includes a voltage command corrector and a drive signal generator. The voltage command corrector corrects the magnitude of an output voltage command on the basis of amplitude variations of an input current from an AC power supply to a power converter, the amplitude variations being caused by a ripple component of the input current. The drive signal generator generates drive signals that turn ON/OFF a plurality of bidirectional switches on the basis of the output voltage command corrected by the voltage command corrector.