An Accurate Online Compensation Method for Inverter Nonlinear Effects

Abstract

The invention provides an accurate on-line compensation method for the nonlinear effect of an inverter, which belongs to the technical field of motor drive control. The present invention first needs to identify the parameters for designing the nonlinear observer of the inverter, that is, the dq-axis inductance. The used dq-axis inductance identification method fully considers the defects of the classical seven-segment SVPWM modulation method, and rearranges the position of the zero vector , at the same time, without considering the influence of inverter nonlinearity, a flux linkage sliding mode observer based on super-helix algorithm can be designed using the identified dq-axis inductance, and the observed inverter nonlinear voltage can be compensated to the αβ axis voltage reference command . Aiming at the situation that the nonlinear model of the inverter is not clear and the compensation is not accurate enough when the phase current is small, the invention proposes a method for accurately compensating the nonlinearity of the inverter online, which can avoid the dead zone error caused by switching the switch tube. ; Realize precise compensation of inverter nonlinearity.

Description

technical field [0001] The invention relates to an accurate on-line compensation method for the nonlinear effect of an inverter, and belongs to the technical field of motor drive control. Background technique [0002] In the prior art, "Inverter Nonlinear Compensation Method, System, Equipment and Storage Medium" discloses a method for inverter nonlinear compensation, which is mainly to firstly identify the output current of the inverter and the comprehensive equivalent delay offline. During the operation of the inverter, the compensation is obtained 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. voltage, and superimpose the compensation voltage on the output voltage of the inverter in the next cycle. The main disadvantage of this method is that it needs offline calculation and storag...

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Problems solved by technology

[0005] "A Nonlinear Compensation Method for Inverters" discloses a nonlinear compensation method for inverters. The method first identifies the nonlinear error of the inverter that varies with the magnitude of the current, and saves the identification results, and then runs the In the process, the nonlinear voltage of the inverter is compensated according to the current value look-up table. This kind of nonlinear compensation of the inverter can only be performed in an offline state, and it needs to be calculated and stored offline. It has poor resistance to inverter parameter disturbances.

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