Electric automobile vector control system nonlinear compensation method and system

A nonlinear compensation and electric vehicle technology, applied in vector control systems, electric vehicles, control systems, etc., can solve problems such as uncertainty, achieve good dynamic performance, strong anti-interference, and high detection accuracy

Active Publication Date: 2016-08-03
HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The conventional control strategy is to use an approximate linear control method. Although this scheme uses linear control theory for controller design, such an approximation itself brings uncertainty to the control of the system.

Method used

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  • Electric automobile vector control system nonlinear compensation method and system
  • Electric automobile vector control system nonlinear compensation method and system
  • Electric automobile vector control system nonlinear compensation method and system

Examples

Experimental program
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Embodiment Construction

[0040] Concrete steps of the inventive method:

[0041] Step 1. The main circuit of the electric vehicle drive motor is generally powered by a three-phase bridge voltage source inverter U1, and the power supply is a DC power supply U10. Since the power device of the inverter is not an ideal switching device, its tube voltage drop has a great influence on the nonlinear output phase voltage and phase current of the inverter. figure 1 Shown is the characteristic curve of EUPEC's power device BSM50GB120DN2 and the saturation voltage drop curve of the diode. After linearization as figure 1 Shown by the dotted line in , that is, the turn-on voltage drop u of the power device ce Approximately regarded as a fixed threshold voltage u th Combination of its impedance voltage drop.

[0042] Step 2: The PC U5 sets the rotational speed signal, and drives the motor of the electric vehicle to rotate by changing the set rotational speed. The speed sensor U9 is sampled by the encoder U12 t...

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Abstract

The invention discloses an electric automobile vector control system nonlinear compensation method and system, and solves the problems of distortion of phase voltage and phase current caused by the nonlinear characteristics of the existing inverter. The electric automobile vector control system nonlinear compensation method is characterized in that voltage deviation caused by conduction voltage drop of an inverter power device is fed back to induction voltage for compensation according to different sectors of current space vectors under a two-phase stationary coordinate system so that the grid-connected voltage space vectors are still guaranteed to be circular traces, and the sine degree of phase voltage and phase current can be enhanced. The electric automobile vector control system nonlinear compensation method and system are simple and effective so that the phenomenon of voltage and current distortion caused by nonlinear error can be effectively reduced, and the operation performance of the system can be enhanced; and the structure is simple and reliable and easy to realize so that the problem of poor dynamic stability caused by low-speed driving of an electric automobile can be solved, the acceleration performance of the electric automobile can be improved, the anti-interference performance is high and detection precision is high.

Description

technical field [0001] The present application relates to an electric vehicle control method and system, in particular to an electric vehicle AC drive motor vector control system precision compensation method and system. Background technique [0002] With the development of electric vehicle technology, drivers have higher and higher requirements for the operability, stability and safety of vehicles. [0003] As a key component of the AC drive system of an electric vehicle, the performance of the inverter directly affects the stability of the vehicle. The mathematical model of the inverter is nonlinear, and its output waveform is a sine wave with certain distortion. The first reason is that in order to prevent the upper and lower bridge arms of the inverter power device from passing through, a dead time is usually added to the drive signal of the power device. While ensuring the safe operation of power devices, it also brings dead zone effects such as voltage and current wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/12H02P21/14B60L15/20
CPCB60L15/20H02P21/14H02P27/12Y02T10/64Y02T10/72
Inventor 周二磊陈强纪永新曹薇薇张先云米东星丁明
Owner HUAIBEI POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER
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