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Method for improving performance of vehicle network system under multi-working-condition operation

A technology with multiple working conditions and performance, applied in control systems, vector control systems, motor vehicles, etc., can solve problems such as loss of traction power

Active Publication Date: 2020-06-16
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have pointed out that low-frequency oscillations may even occur when trains are running, where a sudden loss of traction power can have serious consequences

Method used

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  • Method for improving performance of vehicle network system under multi-working-condition operation
  • Method for improving performance of vehicle network system under multi-working-condition operation
  • Method for improving performance of vehicle network system under multi-working-condition operation

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Embodiment Construction

[0090] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0091] Illustrate the method of the present invention with CRH3 EMUs, comprise the following steps:

[0092] Step 1: Establish a mathematical model of a single traction drive unit in the d-q coordinate system;

[0093] The specific process is as follows:

[0094] S11: A single traction transmission unit of an EMU is composed of a traction network, a rectifier, an intermediate DC circuit, an inverter and a motor;

[0095] S12: Equivalent the inverter and the motor as a non-constant DC power supply i l :

[0096]

[0097] In the formula: i l is the DC side power supply, R is the equivalent resistance of one phase in the three-phase equivalent circuit on the AC side of the inverter, L is the equivalent inductance of one phase in the three-phase equivalent circuit on the AC side of the inverter, for i k and e k The angle between the vect...

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Abstract

The invention discloses a method for improving the performance of a vehicle network system under multi-working-condition operation. The method comprises the steps of 1, establishing a mathematical model of a single traction transmission unit under a d-q coordinate system; and 2, applying a sliding mode variable structure control strategy based on state observation to a grid-side converter LSC of the EMUs. The method does not depend on an accurate mathematical model, and has good adaptability to a complex system. Compared with traditional PI control and SMC, the ESO + SMC control strategy has better control performance, for example, voltage fluctuation during braking is smaller, higher robustness is achieved for system parameter changes and load changes, and the low-frequency oscillation phenomenon generated in the operation process of a motor train unit can be effectively restrained.

Description

technical field [0001] The invention relates to the technical field of electrified railway EMUs, in particular to a method for improving the performance of a vehicle-network system under multiple working conditions. Background technique [0002] With the continuous improvement of science and technology in our country, AC-DC-AC (alternating current-direct current-alternating current, AC-DC-AC) type locomotives are widely used in our country. The complexity of the traction power supply system is greatly increased, the changes in the operating conditions of the train, and the different control methods adopted on the rectifier side will have a certain impact on the performance of the vehicle network system, such as overshoot, slow response speed, and harmonics. Larger distortion rate, greater disturbance to the system during braking, longer time to return to steady state when load changes, etc. In addition, there is also the phenomenon of low frequency oscillation (LFO) of the ...

Claims

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Application Information

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IPC IPC(8): H02P21/13H02P21/14H02P21/22H02P27/08H02J3/24B60L15/20
CPCH02P21/13H02P21/14H02P21/22H02P21/0007H02P27/08H02J3/24B60L15/2009B60L2200/26Y02T10/72Y02T10/64
Inventor 刘志刚张雨婷
Owner SOUTHWEST JIAOTONG UNIV
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