Traction power supply equipment based on PWM rectifier and control method

Abstract

The invention discloses a traction power supply device based on the PWM rectifier. The device comprises a transformer, a rectifier, a control panel, a host computer and a switching power supply. The invention is characterized in that: the rectifier is a PWM rectifier, the switching power supply employs an intelligent power module with high integration degree, the control panel utilizes CPLD for failure predication and pulse blocking protection and sends six paths of PWM pulses via optical fiber interfaces to actuate power switching tubes inside the PWM rectifier, the host computer is connected with the control panel via Ethernet network and serves for the state monitoring and fault diagnosis of the rectifier, the rectifier is conducted under the current decoupling control based on the synchronously-rotating dq coordinate system, utilizes the phase-locked loop to obtain power voltage synchronizing angles and then performs PI regulation of the d-axis current and the q-axis current respectively, and generates six paths of PWM pulses by means of space vector pulse-width modulation.

Description

Technical field [0001] The invention belongs to the field of rail transit traction power supply, and in particular relates to a traction power supply device and a control method based on a PWM rectifier. Background technique [0002] Urban rail transit is an important industry related to the national economy and people's livelihood. Traction power supply to provide electrical energy for urban rail transit is a vital link in this field. At present, urban rail transit mainly adopts 750V and 1500V DC power supply systems. Generally, 12-pulse or 24-pulse diode rectification is used. This type of diode rectifier has been used for decades. Its biggest advantage is simple device structure and reliable performance, but it also has uncontrollable DC voltage and large voltage fluctuations. , The problem of harmonic pollution to the AC power grid. In addition, because urban rail vehicles need frequent starting and braking, and when the vehicle starts quickly, the required traction power is ...

AI Technical Summary

Problems solved by technology

Generally, 12-pulse or 24-pulse diodes are used for rectification. This kind of diode rectifier has been used for decades. Its biggest advantage is that the device has a simple structure and reliable performance, but it also has uncontrollable DC voltage and large voltage fluctuations. , The problem of large harmonic pollution to the AC power grid

In addition, because urban rail vehicles need frequent starting and braking, and when the vehicle starts quickly, the traction power required is large, and the DC voltage rectified by the diode will drop rapidly; when the vehicle is braking, in order to prevent the DC voltage from rising If the limit value is exceeded, the braking energy can only be consumed by the resistor, resulting in a great waste of energy

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