Analysis of battery lifetime characteristics by variable speeds of electric propulsion motor
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초록
Eco-friendly transportation means, such as electric propulsion ships and electric vehicles, are supplied with energy by bat-teries, and hence they have less noise, reduced fuel consumption, and are exhaust-free. They convert the direct current voltage of the battery into alternating current by digital converters, which can change the speed of the motor by varying the voltage and frequency. Therefore, harmonics are loaded in the battery input/output and converter's output system, which affects the battery lifetime. The battery has a negative effect on lifetime because of the increase in internal resistance owing to overheating, harmonic content, chemical reac-tions during charging and discharging, etc. In this study, we measured the total harmonic distortion (THD) of lithium-ion batteries according to the speed change of electric propulsion motors and the internal resistance of the batteries, which is a measure of lifetime prediction. The speed variability of the motor was tested for low-speed, medium-speed, and variable-speed driving conditions. After the test, the effect of the THD on the internal resistance and lifetime of the battery was analyzed. Consequently, it was found that THD was larger when the motor was driven at a variable speed than when it was driven at a constant speed, and it also had a negative effect on battery lifetime.
Abstract
Eco-friendly transportation means, such as electric propulsion ships and electric vehicles, are supplied with energy by bat-teries, and hence they have less noise, reduced fuel consumption, and are exhaust-free. They convert the direct current voltage of the battery into alternating current by digital converters, which can change the speed of the motor by varying the voltage and frequency. Therefore, harmonics are loaded in the battery input/output and converter's output system, which affects the battery lifetime. The battery has a negative effect on lifetime because of the increase in internal resistance owing to overheating, harmonic content, chemical reac-tions during charging and discharging, etc. In this study, we measured the total harmonic distortion (THD) of lithium-ion batteries according to the speed change of electric propulsion motors and the internal resistance of the batteries, which is a measure of lifetime prediction. The speed variability of the motor was tested for low-speed, medium-speed, and variable-speed driving conditions. After the test, the effect of the THD on the internal resistance and lifetime of the battery was analyzed. Consequently, it was found that THD was larger when the motor was driven at a variable speed than when it was driven at a constant speed, and it also had a negative effect on battery lifetime.
참고문헌 (18)
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