Control method for bidirectional quasi-Z-source inversion type motor driving system

A technology of a motor drive system and control method, which is applied in electronic commutation motor control, motor generator control, AC motor control, etc., can solve output voltage and current distortion, increase system electromagnetic noise, increase system torque ripple, etc. problem, to achieve the effect of reducing torque ripple
CN105897099AActive Publication Date: 2016-08-24TONGJI UNIV
6 Cites 18 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
TONGJI UNIV
Publication Date
2016-08-24

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a control method for a bidirectional quasi-Z-source inversion type motor driving system. The control method comprises the following steps of collecting the voltage of a capacitor C2 and the current of a permanent magnet synchronous motor; obtaining voltage components of a d axis and a q axis; obtaining a direct-connection duty ratio; carrying out an SVPWM (space vector pulse width modulation) algorithm by inserting the direct-connection duty ratio according to the voltage components of the d axis and the q axis and the direct-through duty ratio to obtain six paths of PWM control signals for controlling the on and off of three-phase bridge arms of a three-phase bridge type inverter; and carrying out logic calculation on the six paths of PWM control signals to output a PWM control signal for controlling the on and off of an IGBT switch tube S7. Compared with the prior art, the average direct-connection duty ratio and the capacitor voltage closed loop control closed loop policy are added to the conventional SVPWM control method, so that the direct current side voltage has the voltage boosting capability; and on the basis, the power switch S7 which is complementary with the direct-connection state is further designed, so that the bidirectional flow of energy can be realized.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of automobile motor and control technology, in particular to a control method of a bidirectional quasi-Z source inverter motor drive system. Background technique

[0002] In the traditional electric drive system, the inverter is a voltage type inverter, which has the following disadvantages:

[0003] 1. The bus voltage of the voltage-type inverter is the output voltage of the battery, which is limited by the battery voltage. When the car is climbing and accelerating, the voltage will drop when the battery is insufficient, resulting in insufficient output power of the motor. In order to improve Due to the soft characteristics of battery output, a non-isolated BOOST circuit is usually added to the output end of the battery in fuel cell vehicles and electric commercial vehicles. After the BOOST circuit increases the voltage, it is supplied to the three-phase bridge inverter to drive the motor. The level DC / DC inverter i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More