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Accurate inverter nonlinear effect online compensation method

A technology of nonlinear effect and compensation method, which is applied in the control of electromechanical brakes, conversion devices of output power, conversion of AC power input to DC power output, etc. The effect of reducing current, avoiding dead zone error, and realizing precise compensation

Active Publication Date: 2021-03-19
HARBIN INST OF TECH
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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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  • Accurate inverter nonlinear effect online compensation method
  • Accurate inverter nonlinear effect online compensation method
  • Accurate inverter nonlinear effect online compensation method

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Embodiment 2

[0068] In order to verify the effectiveness of the proposed method for nonlinear compensation of inverters, the following figure 1 The inverter nonlinear simulation platform shown.

[0069] Simulation condition setting: the dead time of the three-phase inverter bridge arm is set to 2μs, the IGBT conduction voltage drop U CE =1.4V, diode forward voltage drop U during freewheeling stage DF =1.5V, the current loop adopts deadbeat predictive control.

[0070] given i q * = 2A step, no inverter nonlinear compensation is added between 0.3s and 1s, such as Figure 7 As shown, the actual response to i q current and i q * There will be obvious errors due to the nonlinearity of the inverter, and the inverter compensation method proposed in the invention patent is added to compensate at 1s, and it can be seen that i d and i q Rapid error tracking on the current command. Such as Figure 8 The three-phase current waveform is shown. It can be seen that when the compensation is no...

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Abstract

The invention provides an accurate inverter nonlinear effect online compensation method, and belongs to the technical field of motor drive control. According to the method, firstly, parameters, namelydq-axis inductance, for designing the inverter nonlinear observer need to be identified, the used dq-axis inductance identification method fully considers the defects of a classic seven-segment SVPWMmodulation method, the position of a zero vector is rearranged, and meanwhile, the influence of inverter nonlinearity does not need to be considered, a flux linkage sliding mode observer is designedbased on a superspiral algorithm by utilizing the identified dq-axis inductance, and the observed inverter nonlinear voltage is compensated to an [alpha]-[beta]-axis voltage reference instruction. Aiming at the conditions 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 provides the method for accurately compensating the nonlinearity of the inverter on line, so that the dead zone error caused by switching a switching tube can be avoided; and non-linear accurate compensation of the inverter is realized.

Description

technical field [0001] The invention relates to an accurate online 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 first identify the output current of the inverter and the comprehensive equivalent delay offline 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, and superimpose the compensation voltage on the output voltage of the next cycle of the inverter. The main disadvantage of this method is that it needs to calculate and store the nonlinear data of ...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/13H02P21/24H02P27/08H02M7/5387
CPCH02P21/14H02P21/13H02P21/24H02P21/0007H02P27/08H02M7/53871H02P2203/09H02P2203/11H02P2207/05
Inventor 王明义康凯张成明曹继伟刘家曦李立毅
Owner HARBIN INST OF TECH
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