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Motor asymmetric SVPWM reconstruction method based on PWM phase shift

A phase-shifted and asymmetric technology, applied in the control of generators, motor-generators, AC motors, etc., can solve the problems of long algorithm cycle, disadvantageous accurate sampling, etc., and achieve the effect of eliminating non-observation areas and stably collecting

Pending Publication Date: 2020-06-09
PEKING UNIV
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Problems solved by technology

In the patent "Motor Phase Current Detection Method Based on DC Bus Current" with the application number of 201010039771.3, since the space vector in the non-observation area cannot be directly reconstructed in one PWM cycle, a long algorithm cycle is required, which is not conducive to accurate sampling

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  • Motor asymmetric SVPWM reconstruction method based on PWM phase shift
  • Motor asymmetric SVPWM reconstruction method based on PWM phase shift
  • Motor asymmetric SVPWM reconstruction method based on PWM phase shift

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific illustrations.

[0027] It is a mature technology to reconstruct motor phase current through DC bus current acquisition, also known as single resistor sampling. The main purpose is to reduce the high cost and high installation difficulty brought about by the current sensor detection phase current technology. Using single-resistor sampling is a widely accepted approach in low-accuracy, cost-sensitive applications. Compared with the three-resistor sampling method (3-SHUNT), which is also widely used, there is no need to consider the current flow problem, and two less resistors can be used to reduce the cost.

[0028] Firstly, the space vector modulation technique - SVPWM is explained. Such as figure 2 As shown, the space vector modulation completes the mappin...

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Abstract

The invention provides a motor phase current detection method which is easy to implement and relatively good in control effect, and can effectively reconstruct three-phase current in a non-observationarea when a space vector modulation mode is used for driving a motor and only a direct-current bus current acquisition mode is used. The method aims at a vector which cannot be subjected to accuratecurrent sampling due to too short non-zero basic space vector application time in a PWM carrier period. And under the condition that the vector size and direction in the PWM carrier period are kept unchanged, the front-end sampling time is increased in a PWM phase shift mode to enable the front-end sampling time to meet the minimum voltage sampling window time so as to reconstruct the SVPWM waveform. Asymmetric modulation is carried out in a PWM phase shift mode, the non-observation area is converted into an observation area, meanwhile, an algorithm period is constructed, generation of voltageripples is reduced, and voltage vector action distortion is avoided.

Description

technical field [0001] The invention relates to the technical field of motor space vector modulation (SVPWM) phase current reconstruction, in particular to an asymmetric vector synthesis SVPWM reconstruction method based on a DC bus current (1-SHUNT sampling) acquisition method. Background technique [0002] In the permanent magnet synchronous motor control system, the detection of the three-phase current of the motor is an important part of current feedback regulation. Among the phase current detection methods with sensors, current sensors such as current transformers are commonly used for phase current detection, that is, three or at least two current sensors are installed at the three-phase connection of the motor, and the d-q axis of the motor is obtained according to the calculation. current, and use it as current feedback. Commonly used current sensors are not easy to install and are expensive. In order to reduce costs, a sensorless technology is urgently needed for c...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/22H02P27/12
CPCH02P21/14H02P27/12
Inventor 严伟杨颢飞
Owner PEKING UNIV