A system and method for dead zone current compensation of a three-phase inverter
A three-phase inverter and current compensation technology, which is applied to electrical components, output power conversion devices, etc., can solve problems such as increased torque fluctuations, reduced power efficiency, and increased mechanical wear
Active Publication Date: 2020-09-08
宁波央腾汽车电子有限公司
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Problems solved by technology
Miscompensation causes the output torque of the motor to superimpose harmonic components, resulting in larger torque fluctuations, resulting in increased mechanical wear and reduced power efficiency
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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0050] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0051] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0052] In a preferred embodiment of the present invention, according to figure 1 As shown, a dead-zone current ...
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The invention discloses a dead-zone current compensation system of a three-phase inverter, which is applied to a three-phase inverter, and the correction time is obtained in a preset look-up table according to the speed signal and the torque signal; according to the correction time, the speed Coordinate transformation of the signal and control signal is performed to obtain the predicted three-phase current and then calculate and obtain the three-phase compensation voltage, which is finally superimposed on the three-phase voltage output by the three-phase inverter. The technical scheme of the present invention starts from the perspective of the current command instead of the current real-time current value to predict the three-phase current value of the next control cycle, so as to ensure the consistency of the sequence as much as possible, and at the same time, in order to improve the accuracy, consider Under different working conditions, the control tracking between the current command and the actual current is delayed, and the time correction is performed on the predicted current value.
Description
technical field [0001] The invention relates to the field of motor controllers, in particular to a system and method for dead zone current compensation of a three-phase inverter. Background technique [0002] The three-phase inverter is mainly used for motor control. In the three-phase inverter control algorithm, in order to prevent the two switching tubes of the same bridge arm from being short-circuited, it will deliberately switch between the opening and closing times of the two switching tubes. Add a certain dead time to ensure the reliability of the switching process. Due to the addition of the dead time, there will be a deviation between the actual output voltage and the command voltage, which will lead to a decrease in the fundamental wave component of the voltage and distortion of the output current waveform, resulting in pulsation of the motor output torque. [0003] Therefore, for high-precision control applications, it is necessary to compensate the voltage devia...
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IPC IPC(8): H02M1/38
CPCH02M1/38H02M1/385
Inventor 于玮
Owner 宁波央腾汽车电子有限公司