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Introduction of electric locomotive auxiliary motor and control selection strategy of traction ventilator and transformer ventilator
- Dec 06, 2018 -

Introduction of electric locomotive auxiliary motor and control selection strategy of traction ventilator and transformer ventilator

The electric locomotive auxiliary motor is mainly an auxiliary device designed to ensure the normal operation of the main circuit. Whether it is put into operation depends on the working state of the main circuit, even in the case of low ambient temperature, although the main circuit works in traction or braking. Working conditions, but the temperature rise of the main circuit electrical equipment of these auxiliary equipment services is not high, which not only causes energy waste, increases equipment loss, reduces its service life, but also generates large mechanical and electromagnetic noise, affecting the crew The comfort of the work of the workers. The PID control strategy is selected, and the new sensor is used as the temperature rise detection device of the traction motor. The PLC is used as the system control unit, and the HMI is used as the human-machine interface of the system. The system hardware design is completed, and the PLC and HMI software are designed with special tools. The PID control of the auxiliary motor of the electric locomotive is realized.

The electric locomotive auxiliary motor is mainly an auxiliary device designed to ensure the normal operation of the main circuit. Whether it is put into operation depends on the working state of the main circuit, even in the case of low ambient temperature, although the main circuit works in traction or braking. Working conditions, but the temperature rise of the main circuit electrical equipment of these auxiliary equipment services is not high, which not only causes energy waste, increases equipment loss, reduces its service life, but also generates large mechanical and electromagnetic noise, affecting the crew The comfort of the work of the workers. If research and development of a control system with closed-loop control function, control the input work when the auxiliary motor is required to work, if it is not required to stop it, the auxiliary motor PID control system based on the new sensor, PLC and HMI is the research content of this subject. .

The auxiliary motor is an important equipment for the auxiliary circuit of the electric locomotive. It includes an asynchronous 劈 camera, an air compressor motor, a traction ventilator motor, a brake ventilator motor, a transformer fan motor and a submersible pump motor. The camera provides three-phase power for the auxiliary circuit. The compressor provides the wind source for the locomotive. The traction fan forcibly cools the rectifier, the smoothing reactor and the traction motor, and the transformer fan and the submersible pump dissipate heat for the transformer. The power of these motors ranges from 10 kW to 35 kW. It is the most energy-consuming equipment for electric locomotives except traction motors. Take a 6-axis electric locomotive as an example. The total power of auxiliary motors is up to 300 kW. The sum of the power of the auxiliary motor of the 8-axis electric locomotive is even larger. More importantly, these powerful power-consuming device controls are completely controlled manually by the driver. Among these auxiliary motors, the power of the traction fan motor is second only to the 劈 camera. For the safety of the electric locomotive operation, interlocking is set in the logic control link, in the advanced position of the braking condition and the traction condition, even in the In the cold winter, when the ambient temperature is very low, the traction fan must be turned on without forced cooling of the traction motor, the smoothing reactor, the main transformer, etc., that is, the conditions and timing of the fan opening are not based on the above equipment. The temperature rise is determined by the working conditions of the locomotive. Such a control strategy has obvious deficiencies, neither scientific nor energy-saving. Under the background of promoting energy-saving emission reduction and low-carbon economy to become a social consensus, it is necessary to study and optimize the locomotive auxiliary motor control system according to the specific conditions of the locomotive. Economic significance.

For the control of electric locomotive auxiliary motor, firstly, the control objects should be clearly defined, their characteristics and control requirements should be analyzed, the control strategy should be studied, the control system scheme should be designed, and the specific implementation path should be determined. In the above auxiliary motor, the function of the 劈 camera is to change the single-phase power frequency alternating current into three-phase power frequency alternating current, which is a prerequisite for the normal operation of other auxiliary motors, and its control is manually controlled. In addition, the air compressor is based on The pressure of the total air cylinder is controlled by the pressure controller, and the brake ventilator is controlled by the driver when it is in the resistance braking condition, and their control mode is not changed. The control of traction ventilator and transformer ventilator is manually controlled by the driver. Their control strategies need to be optimized and the control mode is changed to PID control. Therefore, their control is the object of this study.