A traction inverter chopper control system

Abstract

A traction inverter chopper control system, including a double-bridge IGBT chopper unit, a control unit, the signal processing module of the control unit is connected to the power calculation module, and the external input processed voltage, current, and speed signals are sent to the power calculation module; the signal processing module is connected with the mode selection module, and the voltage signal processed by the external input is transmitted to the mode selection module; the power calculation module is connected with the mode selection module, and the calculated power is transmitted to the mode selection module; the power calculation module , the mode selection module are all connected with the duty cycle calculation module, and the output power of the power calculation module and the mode output by the mode selection module are passed to the duty cycle calculation module; the duty cycle calculation module is connected with the pulse generation module, and the generated duty cycle The air ratio signal is transmitted to the pulse generation module, so that the pulse generation module generates a corresponding PWM signal to indirectly control the double-bridge IGBT chopping unit. It has high integration, fast processing speed, high execution efficiency, flexible and convenient programming, and solves the problem of voltage instability in 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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