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A nonlinear compensation device, system and control method for an inverter

A non-linear compensation and inverter technology, which is applied in the control system, irreversible DC power input conversion to AC power output, AC motor control, etc., can solve the problems of inability to realize closed-loop control and poor compensation dynamic effect, and achieve Improved dynamic output stability, small error between output voltage and voltage command value

Inactive Publication Date: 2019-05-03
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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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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  • A nonlinear compensation device, system and control method for an inverter
  • A nonlinear compensation device, system and control method for an inverter
  • A nonlinear compensation device, system and control method for an inverter

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0053] The non-linear compensation device of the inverter provided by the present invention includes a compensated distortion voltage acquisition module 61, an uncompensated distortion coefficient acquisition module 62, a feedback adjustment coefficient acquisition module 63, a compensation voltage acquisition module 64, and a compensation loop 65. The feedback adjustment coefficient acquisition ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02P27/08
CPCH02M7/48H02P27/085
Inventor 李健梁东来曲荣海
Owner HUAZHONG UNIV OF SCI & TECH
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