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A kind of svpwm modulation method, device and system

A modulation method and voltage vector technology, applied in control systems, AC motor control, electrical components, etc., can solve problems such as unfavorable inverters to increase carrier frequency, low DC bus voltage utilization, multi-chip resources, etc., to achieve DC voltage High utilization rate, improve the overall effect, improve the effect of carrier frequency

Active Publication Date: 2021-09-07
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the SVPWM algorithm still has the following defects: the implementation is relatively cumbersome, and a large number of multiplication and division operations are required in the calculation process, which still occupies more chip resources, which is not conducive to increasing the carrier frequency of the inverter and improving the control effect; the traditional SVPWM algorithm can only realize PWM signal modulation in the hexagonal sector area, low DC bus voltage utilization

Method used

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  • A kind of svpwm modulation method, device and system
  • A kind of svpwm modulation method, device and system
  • A kind of svpwm modulation method, device and system

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Experimental program
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Embodiment 1

[0018] figure 1 is the flow chart of the SVPWM modulation method in the first embodiment, refer to figure 1 , this embodiment proposes a SVPWM modulation method, which can be applied to the control of a three-phase motor, so that the three-phase motor can obtain an ideal circular flux linkage trajectory. The method can be performed by a SVPWM modulation device, which can be implemented by software. The device can be configured in electronic equipment, such as a motor controller, and the method includes the steps of:

[0019] S1. Adopt voltage U α_n , U β_n Determine the sector where the three-phase motor voltage vector is located, where the voltage U in the two-phase static coordinate system is determined by the bus voltage α , U β Perform per-unit conversion to get the voltage U α_n , U β_n .

[0020] In this step, the formula used for per-unit conversion is:

[0021]

[0022] Among them, U dc is the bus voltage.

[0023] In this step, the voltage U can be derive...

Embodiment 2

[0077] image 3 It is the structural diagram of the SVPWM modulation device in the second embodiment, refer to image 3 , the present embodiment proposes a SVPWM modulation device, including a sector judging module 1 for adopting the voltage U α_n , U β_n Determine the sector where the voltage vector of the three-phase motor is located, in which the voltage U in the two-phase stationary coordinate system is affected by the bus voltage α , U β Perform per unitization to get the voltage U α_n , U β_n . Time calculation module 2: for passing voltage U α_n , U β_n , to determine the action time of each phase of the voltage vector in each sector. PWM module: Calculate the duty cycle of each phase of the voltage vector in PWM according to the action time of each phase of the voltage vector, and obtain the PWM wave for controlling the three-phase motor.

[0078] Specifically, the time calculation module 2 is also used to: set the maximum time threshold and the minimum time t...

Embodiment 3

[0082] Figure 4 It is the structural diagram of the SVPWM modulation system in the third embodiment, refer to Figure 4, this embodiment proposes an SVPWM modulation system, including a SVPWM modulation device 100, the SVPWM modulation device 100 can execute any SVPWM modulation method provided by the first embodiment of the present invention, and also includes a DC power supply 200, an inverter circuit 300 and a three-phase motor 400. The DC power supply 200 supplies power to the three-phase motor 400 through the inverter circuit 300, and the SVPWM modulation device 100 is used to generate a PWM wave for controlling the three-phase motor.

[0083] Figure 5 is another SVPWM modulation system structure diagram in the third embodiment, refer to Figure 5 , optionally, the modulation system further includes an ADC sampling device 500, the ADC sampling device 500 is used to collect current information of the three-phase motor 400, and replace the current information with the v...

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Abstract

The invention provides a SVPWM modulation method, device and system. Wherein the SVPWM modulation method includes the steps: using the voltage U α_n , U β_n Determine the sector where the voltage vector of the three-phase motor is located, in which the voltage U in the two-phase stationary coordinate system is affected by the bus voltage α , U β Perform per unitization to get the voltage U α_n , U β_n ;Through the voltage U α_n , U β_n , determine the action time of each phase of the voltage vector in each sector; calculate the duty cycle of each phase of the voltage vector in PWM according to the action time of each phase of the voltage vector, and obtain the PWM wave for controlling the three-phase motor. The SVPWM modulation method proposed by the present invention can directly calculate the conduction time of each phase in the three-phase PWM wave, without first calculating the conduction time Tk and Tk corresponding to the two adjacent basic vectors Vk and Vk+1 in the sector area. Tk+1 and the switching time T0 corresponding to the zero vector, and then time allocation and reconstruction, greatly reduce the running time of the SVPWM algorithm.

Description

technical field [0001] Embodiments of the present invention relate to motor control technologies, and in particular, to an SVPWM modulation method, device, and system. Background technique [0002] In the vehicle motor system, the high-voltage power supply is a DC power supply, and the power motor generally adopts a permanent magnet synchronous motor. Therefore, an inverter is required to convert the DC power into an AC power to drive the power motor. Among them, PWM modulation technology is one of the key technologies. The basic principle of PWM technology is the principle of voltage impulse equivalence. [0003] The main idea of ​​SVPWM (Space Vetor Pulse Width Modulation, Space Vector Pulse Width Modulation) technology is based on the ideal flux circle circle of the three-phase symmetrical motor stator when the three-phase symmetrical sine wave voltage is supplied as the reference standard, and the three-phase inverter has different switching modes. Appropriate switchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
CPCH02P27/12
Inventor 李帅李伟亮郭璐璐苏瑞涛段立华李芝炳王韶涵刘亚川
Owner CHINA FIRST AUTOMOBILE
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