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Novel dead-zone effect compensation method of AC servo inverter

An AC servo, dead zone effect technology, applied in the direction of converting AC power input to DC power output, controlling electromechanical brakes, output power conversion devices, etc., can solve the problem of unsatisfactory dead zone compensation, aggravating grid harmonic pollution, reducing control System efficiency, etc.

Inactive Publication Date: 2012-08-01
HANGZHOU DIANZI UNIV
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Problems solved by technology

Moreover, the existence of the dead zone of the inverter makes the output current of the inverter contain a large number of harmonics, which aggravates the harmonic pollution of the system to the power grid and reduces the efficiency of the entire control system
And if the output current of the inverter is very small (close to zero) at the beginning of the dead zone, zero current clamping will occur
[0003] In summary, considering the inherent characteristics of switching devices and the complexity of the dead zone effect, it is not ideal to use the traditional method to achieve accurate dead zone compensation. Therefore, this invention proposes an online compensation algorithm, and the experiment is applied to the AC servo inverter. Compensation for dead zone effects

Method used

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  • Novel dead-zone effect compensation method of AC servo inverter
  • Novel dead-zone effect compensation method of AC servo inverter
  • Novel dead-zone effect compensation method of AC servo inverter

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Embodiment Construction

[0048] Now in conjunction with accompanying drawing, patent of the present invention is described in detail as follows:

[0049] Step 1. Determine the generation of inverter dead zone

[0050] Such as figure 1 As shown, it is a voltage-type PWM inverter circuit, including three bridge arms, which are composed of 6 IGBTs, and each bridge arm is composed of a controllable device (S 1- S 6 ) and an antiparallel diode (D 1 -D 6 )composition. The different conduction modes of the six switches of the three-phase AC inverter bridge generate different voltage basic vectors, and any vector is synthesized through vector synthesis, and the magnitude of the vector is determined by the different conduction times. Let a=0, which means that in the first group of bridge arms: the upper bridge arm is cut off, and the lower bridge arm is turned on; a=1, means that in the first group of bridge arms: the upper bridge arm is turned on, and the lower bridge arm is turned off, similarly The ...

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Abstract

The invention discloses a novel dead-zone effect compensation method of an AC servo inverter. The traditional method is not ideal enough to realize accurate dead-zone compensation, and thus a novel online compensation algorithm is provided aiming at the dead-zone effect of the inverter. The novel online compensation algorithm mainly comprises the four steps of: determining generation of a dead zone of the inverter; determining the relationship between the output voltage of the inverter and the actual reference voltage; determining an error voltage; and providing online compensation. The novel online compensation algorithm can save unnecessary power-on and power-off steps of a switching device, is free from any extra hardware circuit and off-line experiment measurement, has the characteristics of simpleness in implementation, low output waveform harmonic content and the like, well solves the output current pulse of a system at low frequency and effectively eliminates the zero-current clamping phenomenon.

Description

technical field [0001] The invention belongs to the technical field of software design of an AC servo inverter, and in particular relates to a novel method for compensating the dead zone effect of an AC servo inverter. Background technique [0002] Due to the advantages of compact structure, high power density, high air gap flux and high torque inertia ratio, permanent magnet synchronous motor (PMSM) is widely used in AC servo systems, and low-speed performance is an important indicator of servo system performance, affecting low-speed One of the main factors in performance is the inverter side, and the presence of dead zones in induction motor inverters can lead to system instability. In the servo motor system, in order to prevent the short circuit of the DC bus voltage, a certain trigger dead zone must be added before the power device of the same bridge arm is turned on. The existence of the dead zone of the inverter causes an error between the output voltage of the invert...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02P21/14
Inventor 刘栋良张遥崔丽丽郑谢辉
Owner HANGZHOU DIANZI UNIV
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