Electric automobile vector control AC variable-frequency speed regulation system

A vector control, AC frequency conversion technology, applied in electric vehicles, control drives, vehicle components, etc., can solve the problem of not being able to achieve high dynamic performance of DC motors, and achieve the effects of light weight, small size and high efficiency

Active Publication Date: 2008-09-17
SHENZHEN GREENWHEEL ELECTRIC VEHICLE CO LTD
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AI Technical Summary

Problems solved by technology

However, compared with the VVVF variable frequency speed regulation drive system, it has added the torque adjustment using the slip frequency, and the dynamic characteristics have been improved, but because its principle is based on the torque steady-state characteristics, it still cannot achieve the high dynamics of the DC motor. performance

Method used

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  • Electric automobile vector control AC variable-frequency speed regulation system

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Embodiment Construction

[0024]Fig. 1 is the block diagram of the vector control AC frequency conversion speed regulation system of the specific embodiment of the present invention, as shown in Fig. Conversion module, PWM converter, three-phase AC induction motor, flux linkage observer, battery pack, the battery pack is a 144V or 72V high-energy battery pack, an intelligent power module with high-efficiency three-phase output, 75V (corresponding to a 144V battery pack) or 38V ( Corresponding to 72V battery pack) three-phase AC induction motor, PWM converter adopts IPM intelligent power module or IGBT drive circuit, DSP controller takes TI company TMS320LF2407A as the core, also includes switching power supply, A / D conversion interface circuit, motor speed interface circuit, bus, driving control circuit, etc. (not shown in the figure).

[0025] The driver's stepping on the accelerator signal is processed by the interface circuit and sent to the DSP controller. After calculation, the signal speed ω* and...

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Abstract

The invention discloses a vector control AC frequency-variable speed regulation system of an electric automobile, which comprises a DSP controller, a reverse rotation converter module, a two-phase/three-phase AC converter module, a PWM converter, a three-phase AC induction motor, a magnetic flux linkage observer, and a battery pack; wherein, a control system conducts the control by means of speed and magnetic flux linkage closed loop, and a magnetic flux observer uses a current structure; the amplitude and phase of the magnetic flux of a rotor are solved by using three-phase stator current and the rotation speed of the motor, and the field orientation is realized; as the asynchronous motor is a nonlinear link coupled by multiple variables, decoupling and linearization can be achieved via the filed orientation, and therefore system calibration can be performed to obtain the desired dynamic performance. Therefore, by means of comparative and comprehensive researched into the direct torque control technology and vector control technology, the vector control AC frequency-variable speed regulation system has the advantages of solving the key technical problems of the frequency-variable speed regulation of the driving system of an electric automobile, and providing a more efficient technology for the driving system of the electric automobile.

Description

technical field [0001] The invention relates to a control system of an electric vehicle, in particular to a frequency conversion speed regulation system which combines a DSP-based embedded electric vehicle vector control technology and a PWM frequency conversion technology. Background technique [0002] With the increasingly prominent contradiction between energy structure and air pollution of fuel vehicles and the development of high-energy battery technology, modern power electronics and electric drive technology, it has become an important development direction of automobiles to realize the transmission, adjustment and manipulation of automobiles by electric means. Therefore, it is necessary to study electric vehicle drive systems with high efficiency, fast response, wide range of speed regulation, and safety and reliability. The drive system of electric vehicles can be roughly divided into two types: DC drive system and AC drive system. The DC drive system uses a DC mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/06
Inventor 刘长文
Owner SHENZHEN GREENWHEEL ELECTRIC VEHICLE CO LTD
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