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SVPWM modulation method, device and system

A modulation method and static coordinate system 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 High voltage utilization, improve the overall effect, and improve the effect of carrier frequency

Active Publication Date: 2020-02-07
CHINA FIRST AUTOMOBILE
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  • 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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  • SVPWM modulation method, device and system
  • SVPWM modulation method, device and system

Examples

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Embodiment 1

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

[0019] S1. Using 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 .

[0020] In this step, the formula used for per unitization is:

[0021]

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

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

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 a SVPWM modulation system, including a SVPWM modulation device 100, the SVPWM modulation device 100 can execute any SVPWM modulation method provided in Embodiment 1 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 PWM waves for controlling the three-phase motor.

[0083] Figure 5 It is another SVPWM modulation system structure diagram in Embodiment 3, refer to Figure 5 , optionally, the modulation system further includes an ADC sampling device 500, the ADC sampling device 500 is used to collect the current information of the three-phase motor 400, and convert the current information into the voltage U in...

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Abstract

The invention provides an SVPWM modulation method, device and system. The SVPWM modulation method comprises the following steps: judging a sector where a voltage vector of a three-phase motor is located by adopting voltages Ualpha_n and Ubeta_n, wherein the voltages Ualpha_n and Ubeta_n are obtained by performing per-unit processing on voltages U<alpha> and U<beta> in a two-phase static coordinatesystem through a bus voltage; judging the action time of each phase of the voltage vector in each sector through the voltage Ualpha_n and the voltage Ubeta_n; and calculating the duty ratio of each phase of the voltage vector in PWM according to the action time of each phase of the voltage vector to obtain a PWM wave for controlling the three-phase motor. According to the SVPWM modulation methodprovided by the invention, the on-time of each phase in the three-phase PWM wave can be directly calculated, there is no need to calculate the on-time Tk and T<k+1> corresponding to two adjacent basicvectors Vk and V<k+1> and the switching time T0 corresponding to a zero vector in the sector region and then carry out time distribution and reconstruction, and therefore, the operation time of the SVPWM algorithm is greatly reduced.

Description

technical field [0001] Embodiments of the present invention relate to motor control technology, and in particular to a 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 uses a permanent magnet synchronous motor, so an inverter is needed to convert DC power into 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 equivalent principle of voltage impulse. [0003] The main idea of ​​SVPWM (Space Vetor Pulse Width Modulation, Space Vector Pulse Width Modulation) technology is based on the three-phase symmetrical motor stator ideal flux circle as the reference standard when the three-phase symmetrical sine wave voltage is supplied, and the different switching modes of the three-phase inverter Make appropriate switching to form a PWM wave, and use th...

Claims

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Application Information

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Patent Type & Authority Applications(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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