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Voltage space vector PWM (pulse width modulation) control method based on three-phase independent H-bridge drive circuit

A voltage space vector, bridge drive circuit technology, used in vector control systems, motor generator control, AC motor control, etc.

Active Publication Date: 2013-05-22
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the drive circuit structure is different from the commonly used three-arm drive circuit structure, the traditional voltage space vector PWM control method is no longer applicable to this circuit structure, so it is necessary to develop a set of voltage space vector control methods for the three-phase independent H-bridge drive circuit structure. PWM control method

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  • Voltage space vector PWM (pulse width modulation) control method based on three-phase independent H-bridge drive circuit
  • Voltage space vector PWM (pulse width modulation) control method based on three-phase independent H-bridge drive circuit
  • Voltage space vector PWM (pulse width modulation) control method based on three-phase independent H-bridge drive circuit

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Embodiment Construction

[0047] In the present invention, according to the operating principle of the three-phase independent H-bridge drive circuit, the three working modes of a single H-bridge are equivalent to "1", "-1" and "-1" respectively. 0". According to the switching modes of the three H-bridges, a total of 27 working states can be combined, and 27 voltage space vectors can be obtained, and vectors with small amplitude and physically unrealizable are excluded, and 14 basic voltage space vectors are selected, including 6 Long vector, 6 short vectors and 2 zero vectors.

[0048] According to the 14 basic voltage space vectors, the regular hexagonal voltage space vector trajectory is formed. The inscribed circle of the regular hexagon is the voltage vector circle required for AC motor voltage space vector PWM control, and the radius of the circle is the basic voltage space vector. the maximum magnitude of short and medium vectors;

[0049] The voltage vector circle is divided into 12 sectors f...

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Abstract

The invention relates to the three-phase independent H-bridge drive circuit voltage space vector PWM (pulse width modulation) control technology of a three-phase alternating-current permanent magnet synchronous torque servo motor, and aims to provide a voltage space vector PWM control method based on a three-phase independent H-bridge drive circuit. Fourteen fundamental voltage space vectors including six long vectors, six short vectors and two zero vectors in voltage space vectors are designed, an orthohexagonal internally tangent voltage vector circular track is formed through the vectors, and a voltage vector circle is divided into twelve sectors by the aid of the twelve short and long vectors. A vector time calculation method and a sector determination method are provided, radius and sector number of the voltage vector circle formed by voltage space vector PWM control of the three-phase independent H-bridge drive circuit are two times of radius and sector number of a voltage vector circle formed by a traditional three-leg drive circuit voltage space vector PWM control mode, and generated maximum torque value and torque adjustment accuracy are also two times of those of the tradition mode.

Description

technical field [0001] The invention relates to the technical field of voltage space vector PWM control of a three-phase alternating current permanent magnet synchronous torque motor. Background technique [0002] For the three-phase AC permanent magnet synchronous torque motor, there are basically two methods to improve the output torque. This improves the output torque of the motor, but this method will increase the voltage level of the circuit system, increase the difficulty of device selection, and reduce the anti-interference ability and reliability of the circuit; another method is based on the output torque of the motor is proportional to its diameter However, this method is not suitable for the application environment with strict requirements on size. Therefore, in some special occasions, the three-phase AC permanent magnet torque motor will use a three-phase independent H-bridge drive circuit for drive control. The drive circuit is composed of three independent H-b...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/06
Inventor 黄梁松于清洋
Owner SHANDONG UNIV OF SCI & TECH
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