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Control method, controller and system for full-cycle low common-mode voltage operation

A common-mode voltage and control method technology, applied in control systems, AC motor control, electrical components, etc., can solve problems such as common-mode voltage increase, affecting the safe and stable operation of the motor, and achieve simple control, avoid adverse effects, and avoid mathematics. Calculated effect

Active Publication Date: 2020-06-26
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

Due to the switching of the switching tube state, the common mode voltage will increase during the dead time, which will affect the safe and stable operation of the motor

Method used

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  • Control method, controller and system for full-cycle low common-mode voltage operation
  • Control method, controller and system for full-cycle low common-mode voltage operation
  • Control method, controller and system for full-cycle low common-mode voltage operation

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specific Embodiment approach

[0066] In order to realize the stable operation of the low common-mode voltage within the full-cycle operating range of the T-type three-level inverter, the present invention proposes a hybrid control strategy. The specific implementation is as follows:

[0067] like figure 1 As shown, the main circuit topology of the present invention is a T-type three-level inverter, the DC side is a DC voltage source, the AC side of the T-type three-level inverter is a three-phase AC output, and the load is a three-phase AC motor M. The resistance in series on each phase line of the three-phase AC output is R, and the inductance in series are L, U dc is the input voltage, that is, the DC side is the voltage value of the DC voltage source.

[0068] DC side filter capacitor C 1 , C 2 Realize the function of filtering and supporting the DC side voltage, the connection point of the capacitors C1 and C2 forms the neutral point O of the DC side, and realizes the output of three levels on the ...

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Abstract

The invention discloses a control method, a controller and a system for full cycle low common mode voltage operation. Among them, the method is applicable to the T-type three-level inverter motor drive system, including: when the T-type three-level inverter motor drive system is running in the non-dead time, the model predictive control strategy with low common mode voltage is adopted , to achieve low-voltage operation; when the T-type three-level inverter motor drive system runs in the dead time and the switch state switching occurs between two or three bridge arms, all three-phase switch tubes are disconnected to ensure The bridge arm only outputs large vectors to achieve low common-mode voltage operation; among them, the large vectors are PNN, PPN, NPN, NPP, NNP and PNP, and the common-mode voltage amplitude is 1 / 6 times the input voltage value. It has the advantages of simple control and no complex parameter adjustment, and has high practical value.

Description

technical field [0001] The invention belongs to the field of power electronic control, and in particular relates to a control method, a controller and a system for full-cycle low common-mode voltage operation. Background technique [0002] The T-type three-level inverter is used as an AC / DC interface converter to convert direct current into alternating current. This converter topology combines the advantages of two-level topology (such as low loss, less switching devices and simple operation, etc.) It is widely used in photovoltaic power generation, motor drive, DC transmission and other fields. Especially as a motor drive device, due to its excellent output voltage waveform quality and control flexibility, it provides strong support for modern high-performance PWM motor drives and brings huge economic benefits. However, many problems are increasingly exposed and need to be solved urgently. [0003] When the T-type three-level PWM inverter drives the motor, due to the swi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
CPCH02P27/12
Inventor 张承慧李晓艳邢相洋秦昌伟
Owner SHANDONG UNIV
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