Terminal voltage acquisition and compensation method capable of improving accuracy of power level motor simulator

Abstract

A terminal voltage acquisition and compensation method capable of improving accuracy of a power level motor simulator relates to output terminal voltage acquisition and compensation methods for inverters of power level motor simulators and comprises the following steps of respectively building terminal voltage acquisition circuits of a motor driver and a motor simulator, wherein the terminal voltage acquisition circuits include a resistance divider, a first op amp, a second op amp, a third op amp and a DSP; capturing the output signal of the first op amp to obtain the equivalent duty cycle ofthe terminal voltage, and sampling the output signal of the third op amp to obtain the amplitude of the terminal voltage; calculating the actual equivalent terminal voltage output by the inverter; calculating the phase voltage output by the inverter; repeating the steps (3)-(4) during each control cycle of the motor simulator to obtain the actually output phase voltage; obtaining the compensationvoltage by subtracting the actual equivalent terminal voltage from the command terminal voltage; transforming the compensation voltage into a two-phase coordinate system; feeding the compensation voltage forward to complete the voltage compensation. The terminal voltage acquisition and compensation method provided by the invention is simple and reliable, and high in accuracy, and can improve the simulation accuracy of the motor simulator.

Description

technical field [0001] The invention relates to a method for collecting and compensating the voltage at the output terminal of a power-level motor simulator inverter used for motor driver testing. In detail, it is a simple, reliable, high-precision method that can improve the simulation accuracy of the motor simulator and improve the power-level motor simulation. Accurate terminal voltage acquisition and compensation method. Background technique [0002] We know that the power level motor simulator has the advantages of convenient testing, energy can be fed back to the grid, and the ability to simulate extreme or wrong working conditions of the motor, so it is widely used in the testing of motor drives in electric vehicles, aerospace, wind power and other fields middle. It is a low-cost, simple and effective way to use a DSP-based power-stage motor simulator instead of a traditional motor bench to test motor drives. However, due to the slow operation speed of DSP, there is...

AI Technical Summary

Problems solved by technology

Existing voltage compensation strategies require complex algorithms to judge the current polarity and calculate the compensation voltage, and the calculated compensation voltage usually takes the voltage drop of the IGBT and the diode as a fixed value, and the compensation is not accurate

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