Abstract

This paper designed the loop-locked SVPWM control system of current source inverter (CSI) in the battery pack charging/discharging system. The battery pack is sensitive to the charging/discharging current ripple and orders the current posess fast transform speed. Because the battery pack has tiny inner resistance, back electromotive force and it acted as a comparative load. This made the system hard to design. The control system aimed at the specialty of the battery pack load and put forward a loop-locked control method based on dq coordinate conversion in SVPWM converters. It increases the transform efficiency by SVPWM and gets high power factor and high dynamic response quality by dq coordinate conversion.

Highlights

  • When the battery pack is tested, it needed to be charged and discharged by its testing system converters

  • The control system aimed at the specialty of the battery pack load and put forward a loop-locked control method based on dq coordinate conversion in SVPWM converters

  • The inner resistance of the battery pack is very small and it has back electromotive force, when the converter’s output voltage is applied on the battery pack, even if the voltage has very little ripples, the current through the battery will be large. Researches showed that both the phased-inverter and the PWM inverter have the problem of outstand current ripple when they are used in battery pack testing [3]

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Summary

Introduction

When the battery pack is tested, it needed to be charged and discharged by its testing system converters. The battery pack is a sensitive load to the converters When it is charged/discharged, it requires the converter of its testing system to output low-ripple current which has fast response speed. The inner resistance of the battery pack is very small and it has back electromotive force, when the converter’s output voltage is applied on the battery pack, even if the voltage has very little ripples, the current through the battery will be large. The linear regulator has many disadvantages, such as the low power factor, large power cost et al With the development of battery’s pack-making technique and its specific energy, the battery testing system is requested to be of high-capacity. It can satisfy the request that the battery pack testing ask for convert technology

Converter Structure and Work Theory
Design of Control System
The Design of Current Inner Control Loop
Design of Current Outer Loop Rectifier
Research of Emulation
Experimental Procedure
Discussion
Findings
Conclusions
Full Text
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