Inverter dead zone compensation system and method
A dead zone compensation and inverter technology, applied in the direction of irreversible DC power input conversion to AC power output, can solve the problem that the rotation angle cannot be accurately determined, and achieve the effect of avoiding failure
Active Publication Date: 2012-10-17
SUZHOU INOVANCE TECH CO LTD +1
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[0006] The technical problem to be solved by the present invention is to provide an inverter dead zone compensation system and method for the problem that the rotation angle cannot be accurately determined in the above dead zone compensation
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[0037] 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.
[0038] Such as figure 1 Shown is a schematic diagram of the first embodiment of the inverter dead zone compensation system of the present invention. The system includes a three-phase phase-locked loop 11, a first rotation transformation unit 12, a low-pass filter unit 13, and an inverse transformation unit 14, wherein the three-phase phase-locked loop 11 is connected to the sampling current (that is, the three-phase current input to the motor), And it is sequentially connected with the first rotation transformation unit 12 , the low-pass filter unit 13 , and the inverse transformation unit 14 .
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The invention provides an inverter dead zone compensation system, which comprises a three-phase phaselocked loop, a first rotating conversion unit, a low-pass filter unit, and an inverted conversion unit, wherein the three-phase phaselocked loop is used for processing a three-phase current input into a motor to obtain a current angular frequency omega and a rotation angle theta; the first rotating conversion unit is used for performing the rotating conversion of the current according to the rotation angle theta to obtain a D axis current component and a Q axis current component; the low-pass filter unit is used for performing low-pass filtration on the D axis current component and the Q axis current component respectively; and the inverted conversion unit is used for performing inverted conversion on the D axis current component and the Q axis current component subjected to low-pass filtration and the current obtained after inverted conversion can be used directly for judging the zero crossing of the current in dead zone compensation. The invention also provides a corresponding method. According to the method, the angular frequency of the current is obtained by current sampling, so that the angular frequency of the three-phase current can be traced accurately at any time, and the judgment of the zero crossing of the current is always accurate.
Description
technical field [0001] The invention relates to the field of inverter control, and more specifically relates to an inverter dead zone compensation system and method. Background technique [0002] Voltage pulse width modulation frequency converters are widely used in various motor control occasions. In order to prevent the upper and lower power devices of the same bridge arm of the inverter from passing through and destroying the inverter, it is necessary to artificially add dead time to the control signal (in During the dead time, both power devices are cut off), so as to ensure that the upper and lower power devices of the same bridge arm are always turned off first and then turned on. In addition, when the inverter is working, there is a delay in the switching time, and the turn-off time is usually longer, which leads to a difference between the actual voltage value and the theoretical value. This effect can also be called a dead zone. [0003] The existence of the dead z...
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Inventor 唐杰
Owner SUZHOU INOVANCE TECH CO LTD