Three-phase inverter dead band time online adjustment and compensation method

A technology of three-phase inverter and dead time, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve the problem of output voltage, current distortion, no longer valid, switching devices Simultaneous conduction and other issues

Inactive Publication Date: 2015-09-09
ANQING NORMAL UNIV
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Problems solved by technology

[0002] The three-phase voltage source inverter (VSI) has been widely used now. Its commutation is completed between the upper and lower switching devices of the same bridge arm. The driving signal adopts complementary PWM signals. shutdown takes some time, and usually t off >t on , so it is possible that the upper and lower switching devices are turned on at the same time (that is, one is not completely closed and the other is already open)
[0003] The setting of the dead time will bring some negative effects to the inverter system, which will lead to output voltage and current distortion, which is not allowed in the occasions requiring high control performance, so it is necessary to compensate the dead time
[0004] In the existing methods, some methods are to calculate the error voltage vector caused by the dead zone and t

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Embodiment Construction

[0052] A method for online adjustment and compensation of dead time of a three-phase inverter according to the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053] 1. Determination of three-phase dead zone error voltage synthesis vector

[0054] In the voltage source converter (VSI), since the switching device is not an ideal device, a dead time must be inserted to prevent the upper and lower bridge arms from being directly connected. figure 1 A bridge arm of VSI is shown, and the direction of current flowing out of VSI is defined as positive direction, and the direction of current flowing into VSI is negative direction.

[0055] figure 2 for a switching period T sWithin, the relationship between the switching signal and the output voltage of the bridge arm. Ideally, the driving signals of the upper and lower bridge arms are complementary as figure 2 As shown in (a), the corresponding bridge arm voltage is as...

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Abstract

The invention discloses a three-phase inverter dead band time online adjustment and compensation method. By adjusting the dead band time online and modulating the dead band voltage into synthesized voltage of fundamental wave and third-harmonic square wave, the influence of harmonic voltage caused by a dead band on current is eliminated. The defect that the dead band time is close to zero when the current crosses zero is overcome. Moreover, current direction detection is not needed, calculation is simple, implementation is easy, and the method has engineering practical value.

Description

technical field [0001] The invention relates to the technical field of power electronic circuit control, in particular to an online adjustment and compensation method for the dead time of a three-phase inverter. Background technique [0002] The three-phase voltage source inverter (VSI) has been widely used now. Its commutation is completed between the upper and lower switching devices of the same bridge arm. The driving signal adopts complementary PWM signals. shutdown takes some time, and usually t off >t on , so there may be a phenomenon that the upper and lower switching devices are turned on at the same time (that is, one is not completely closed while the other is already open). Such as figure 1 As shown, when the upper and lower switching devices of the same phase bridge arm are turned on at the same time, it will cause a short circuit of the DC side power supply. In order to prevent this phenomenon, a certain time interval is usually added between the conducti...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/38
Inventor 吴文进
Owner ANQING NORMAL UNIV
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