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SVPWM control method of electric motor control and controller employing the same

A control method and motor control technology, applied in the direction of motor generator control, AC motor control, electromechanical transmission control, etc., to achieve real-time control accuracy and improve execution speed

Inactive Publication Date: 2008-04-09
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The primary purpose of the present invention is to provide a new SVPWM modulation method to solve the defects caused by various SVPWM modulation methods based on the switch state hexagon to the real-time control of AC motors, and effectively reduce the complex sine function and arctangent function. A large number of calculations from the computer facilitate the implementation of high-precision and real-time control of the motor

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  • SVPWM control method of electric motor control and controller employing the same
  • SVPWM control method of electric motor control and controller employing the same
  • SVPWM control method of electric motor control and controller employing the same

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Embodiment Construction

[0025] For the three-phase voltage inverter, the phase voltage of the motor depends on the state of the upper and lower power switches of the corresponding inverter bridge arm. As shown in Figure 1, the three-phase bridge voltage inverter has 8 working states, which are substituted into the voltage space vector defined by the following formula:

[0026] U r → = 2 3 ( u a + e j 2 / 3 π u b + e j 4 / 3 π u c ) - ...

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Abstract

The invention relates to a SVPWM control method and mechanism in motor control. SVPWM modulation method adds zero sequence component u<®~> z to make up for modulation signal u<®~> a, b, c, and obtains SVPWM modulated wave signal u<®~®~>a, b, c. SVPWM modulation signal u<®~®~>a, b, c directly calculates and determines three-phase comparator shifting point Ta, Tb, Tc, eliminating the need for complicated conventional steps and algorithms relying on the on-off state hexagonal SVPWM trigonometric function, determined sector as well as vector action time, which is simple and effective in raising the chip's execution speed and achieving precise real-time motor control.

Description

technical field [0001] The invention relates to a control method and device for an AC motor in a hybrid electric vehicle, in particular to an all-digital AC motor control device and a SVPWM modulation method using SVPWM technology. Background technique [0002] In recent years, the space vector theory of the motor has been introduced into the inverter and its control. The basic principle is to use different combinations of the switch control signals of each bridge arm of the inverter to make the running track of the space vector of the output voltage of the inverter As close to a circle as possible. Compared with the traditional SPWM (SinePulse-Width Modulation sine pulse width modulation), the switching times of the switching devices are reduced by 1 / 3, and the DC voltage utilization rate is increased by about 15.47%. It can obtain better harmonic suppression effect, and It is easy to realize digital control, but the conventional SVPWM (Space Vector PWM, space vector PWM) ...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/05H02P27/00H02P21/14H02P27/08
Inventor 谢美娟
Owner CHERY AUTOMOBILE CO LTD