Chopping control system of traction inverter

Abstract

A chopping control system of a traction inverter comprises a double-bridge IGBT chopping unit and a control unit; a signal processing module of the control unit is connected with a power calculation module, and the voltage, current and rotating speed signals processed by external input are transmitted to the power calculation module; the signal processing module is connected with a mode selectionmodule and transmits the voltage signal subjected to the processing through the external input to the mode selection module; the power calculation module is connected with the mode selection module and transmits the calculated power to the mode selection module; the power calculation module and the mode selection module are connected with a duty ratio calculation module and transmit the output power of the power calculation module and the mode output by the mode selection module to the duty ratio calculation module; and the duty ratio calculation module is connected with a pulse generation module and transmits a generated duty ratio signal to the pulse generation module, so the pulse generation module generates a corresponding PWM signal to indirectly control a double-bridge IGBT choppingunit. The system is high in integration level, high in processing speed, high in execution efficiency and flexible and convenient in programming, and solves the problem of unstable voltage during traditional chopper control.

Description

technical field [0001] The invention relates to a traction inverter, in particular to a chopper control system of the traction inverter. Background technique [0002] The traction inverter is the core of the urban rail vehicle traction system. It mainly provides a three-phase power supply with variable voltage and frequency for the asynchronous motor or permanent magnet motor, and then realizes the traction and braking control of the vehicle. The traction inverter mainly includes a DC part (such as pre-charging, LC filtering), a chopper part and an inverter part. The brake chopper part adopts the high-power power electronic component IGBT, which is used to brake the vehicle through the brake chopper unit when the braking energy cannot be fed back to the grid and the grid voltage exceeds the set voltage value under the braking condition of the vehicle. The energy is consumed on the braking resistor, and the stability of the intermediate voltage is ensured, which is beneficia...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of inverter chopping control system with double-bridge IGBT as the chopping unit, based on the control unit of MCU and FPGA as the core, mainly solve the high calorific value of single IGBT, and the real-time performance of chopping control is poor , intermediate voltage control instability and other issues

Secondly, it solves the problem that the traditional platform occupies and affects the limited pin resources, speed and efficiency of the MCU

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