Novel control system and method for auxiliary inverter of rail transit

Abstract

Disclosed is a novel control system and method for an auxiliary inverter of rail transit. The system comprises an output-voltage instantaneous value feedback module, a filter capacitor voltage feedforward module and a diode front busbar voltage differential feedforward module. The control method includes: firstly, controlling an effective value of output voltage to be stabilized through the output-voltage instantaneous value feedback module; secondly, inhibiting influence on output voltage due to busbar voltage fluctuation through the filter capacitor voltage feedforward module; thirdly, increasing dynamic response speed of the filter capacitor voltage feedforward module through the diode front busbar voltage differential feedforward module; fourthly, summing a feedback modulation ratio ao, a feedforward modulation ratio adc and a differential feedforward modulation ratio ad respectively outputted by the output-voltage instantaneous value feedback module, the filter capacitor voltage feedforward module and the diode front busbar voltage differential feedforward module to obtain a total modulation ratio. Based on multi-compound differential feedforward, resistance of the auxiliary inverter to busbar voltage change is improved, and stability and reliability in output voltage of the auxiliary inverter are guaranteed.

Description

technical field [0001] The invention relates to the technical field of auxiliary inverter control, and specifically proposes a novel control system and method for auxiliary inverters in rail transit. Background technique [0002] Rail transit auxiliary inverter is the main power supply for subways, trains, passenger cars and other vehicles. Through this device, the DC bus voltage can be inverted into 380V / 50Hz three-phase fans, air compressors, etc.) As the core of the auxiliary inverter, the auxiliary inverter control system plays an important role in the performance and reliability of the auxiliary inverter. With the continuous development of information technology, the research of high-performance and high-reliability auxiliary inverter has become one of the focuses in the field of electric transmission. [0003] In the actual operation of the rail transit auxiliary inverter, due to the large fluctuation of the railway distribution network, there are bus voltage changes...

AI Technical Summary

Problems solved by technology

[0003] In the actual operation of the rail transit auxiliary inverter, due to the large fluctuation of the railway distribution network, there are bus voltage changes such as sudden drop, sudden rise or periodic fluctuation of the DC bus voltage, which makes the performance of the auxiliary inverter Often does not meet system requirements

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