EV Inverter Voltage Compensation for Fast Current Response
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Solution Overview
Problem
Existing control devices for inverter circuits in electric vehicles face delayed response performance when control deviation increases or decreases sharply, leading to insufficient response performance.
Innovation Solution
A control device that calculates input current based on output current command values and determines output voltage compensation amounts based on input voltage variations, improving the responsiveness of the inverter circuit by considering the internal resistance of the DC power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is used to make output voltage deviation zero, then output voltage control is achieved, but response performance is insufficient when control deviation changes sharply
Solution Approach 1:
The patent calculates the output voltage compensation amount in advance based on the input voltage variation amount and input current, before the actual voltage deviation occurs. This preliminary calculation allows the system to proactively compensate for expected voltage changes, improving response performance when control deviation changes sharply while maintaining reliable output voltage control.
2Measurement precision
If feedback gain is determined based on DC power supply charging rate, then internal resistance change is reflected, but control response is delayed when deviation changes sharply
Solution Approach 1:
Instead of waiting for voltage deviation to occur and then adjusting feedback gain, the patent preemptively calculates the output voltage compensation amount based on input voltage variation and input current. This eliminates the time delay associated with feedback gain adjustment while still accurately reflecting internal resistance changes, thus improving control response time without sacrificing measurement precision.
Data Source
AI summary
This control device for controlling an inverter circuit calculates an input current of the inverter circuit on the basis of an output current instruction value for controlling an output current of the inverter circuit, and calculates, on the basis of the calculated input current, an output voltage compensation amount according to the fluctuation amount of an input voltage of the inverter circuit.