Three-level inverter midpoint potential balance control method, device, medium and motor
A three-level inverter and potential balance technology, applied in the field of control, can solve problems such as midpoint potential imbalance, and achieve the effect of improving execution efficiency
Active Publication Date: 2021-09-21
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0003] The main purpose of the present invention is to overcome the defects of the above-mentioned prior art, and provide a three-level inverter midpoint potential balance control method, device, medium and motor to solve the midpoint clamping type inverter in the prior art. The problem of unbalanced midpoint potential of the device
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[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0041]It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embod...
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The present invention provides a method, device, medium and motor for controlling midpoint potential balance of a three-level inverter. The method includes: detecting the second voltage of two voltage dividing capacitors on the DC bus voltage side of the three-level inverter A voltage and a second voltage; according to the detected first voltage and second voltage, determine the midpoint potential voltage of the three-level inverter; according to the midpoint potential voltage and the preset midpoint potential voltage According to the comparison result of the allowable range, the midpoint potential adjustment time is determined for midpoint potential adjustment; and the switching action time is calculated according to the determined midpoint potential adjustment time for space vector control. The solution provided by the invention can control the mid-point potential voltage within the allowable range to meet the control requirements.
Description
technical field [0001] The invention relates to the field of control, in particular to a method, device, medium and motor for midpoint potential balance control of a three-level inverter. Background technique [0002] Compared with the two-level inverter, the neutral-point clamped three-level inverter has less voltage stress on the switch tube, lower harmonic content of the output waveform, less electromagnetic interference problem, and high efficiency. It is increasingly used in large It is used in occasions under conditions such as power and high speed. However, the midpoint potential imbalance is an inherent problem of the midpoint clamp inverter. The midpoint potential imbalance will affect the quality of the inverter output waveform, cause torque ripples in the motor, and reduce the service life of the DC bus capacitor. The unbalanced voltage distribution at the tubes increases the voltage borne by some switch tubes, which is not conducive to the reliability of the sys...
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IPC IPC(8): H02M7/487H02M1/32H02M1/088H02P27/08
CPCH02M1/088H02M1/32H02M7/487H02P27/08
Inventor 李立牛高产张婉
Owner GREE ELECTRIC APPLIANCES INC