Non-linear compensation device and system for inverter, and control method

Abstract

The invention discloses a non-linear compensation device and system for an inverter, and a control method. The method comprises the steps: obtaining a compensated distortion voltage according to a d-axis component of a compensated voltage instruction and the voltage waveform data; obtaining a non-compensated distortion coefficient according to the d-axis component of the compensated voltage instruction and the d-axis component of the voltage waveform data; comparing the non-compensated distortion coefficient with a non-compensated distortion coefficient threshold range, and outputting a judgment result; obtaining a current feedback adjustment coefficient according to the judgment result and a former feedback adjustment coefficient; obtaining a compensation voltage through the current distortion voltage component and the feedback adjustment coefficient, and injecting the compensation voltage component into the non-compensated voltage instruction value, i.e., compensating for the nonlinearity of the inverter. According to the invention, the method achieves the nonlinear closed-loop compensation of the inverter, reduces the distortion degree of a voltage, and improves the control performance.

Description

technical field [0001] The invention belongs to the field of electromechanical technology, and more specifically relates to a nonlinear compensation device, system and control method of an inverter. Background technique [0002] Voltage source inverters are widely used in various control fields. In order to prevent the short circuit problem caused by the direct conduction of the upper and lower switching tubes, it is necessary to add a dead time between the actions of the upper and lower switching devices to prevent the two switching tubes from being turned on at the same time. However, the addition of dead time will cause distortion in the output voltage of the inverter, and there will be a deviation between the output voltage and the command voltage. This phenomenon is called dead time. In addition, due to the delay in the process from receiving the switching signal to the switching action of the switching tube, there is also a deviation between the actually generated vol...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a nonlinear compensation device, system and method of an inverter, the purpose of which is to compensate the nonlinear compensation device of the inverter due to the inability to realize closed-loop control. Technical issues with poor dynamics

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