Inverter nonlinear compensation method, system, device and storage medium

Abstract

The present invention provides an inverter nonlinear compensation method, system, equipment and storage medium. The method includes: offline identification of the corresponding relationship between the output current of the inverter and the comprehensive equivalent delay, and the comprehensive, etc. The effect delay is related to the switching frequency of the inverter; the corresponding relationship between the output current of the inverter and the voltage drop of the power tube is identified offline, and the voltage drop of the power tube has nothing to do with the switching frequency of the inverter; During the operation of the inverter, based on the corresponding relationship between the output current of the inverter and the comprehensive equivalent delay and the corresponding relationship between the output current of the inverter and the voltage drop of the power tube, the compensation voltage is obtained, and superimposing the compensation voltage on the output voltage of the inverter in the next cycle. The embodiment of the present invention can compensate the nonlinear error of the inverter, which is not only easy to operate, but also does not increase hardware cost.

Description

technical field [0001] The present invention relates to the field of motor control, and more specifically, relates to an inverter nonlinear compensation method, system, equipment and storage medium. Background technique [0002] In the field of low-voltage variable frequency drives, six-tube three-phase half-bridge voltage inverters are usually used, such as figure 1 As shown, six power transistors S are controlled by pulse width modulation (Pulse Width Modulation, PWM) UP , S UN , S VP , S VN , S WP , S WN Convert the DC bus voltage to the desired AC voltage and output it to the motor. In the actual implementation process, due to the non-ideal characteristics of the inverter (such as the dead time introduced to avoid the direct connection of the upper and lower bridge arms of the inverter, the voltage drop of the power tube and the switching delay, etc.), the actual output voltage There is a nonlinear error with the given voltage, and the 5th and 7th current harmonic...

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Problems solved by technology

[0008] The embodiments of the present invention aim at the high hardware cost of the above-mentioned voltage detection scheme, which cannot effectively reflect the influence of the actual output voltage slope change, the online compensation scheme has poor applicability, and cannot distinguish the 6th harmonic fluctuation, and the current angle scheme is easy to cause the current angle when the current is small. To solve the problem of drastic changes and the difficulty of implementing offline calculation and compensation schemes, a method, system, equipment and storage medium for nonlinear compensation of inverters are provided

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