Performance influence of auxiliary power batteries on hybrid energy storage system

Abstract

To confirm the efficiency of HESS affected by supercapacitor and purely electric flywheel batteries. First, the operation modes of lithium battery-supercapacitor and lithium battery-flywheel hybrid energy systems are designed in this study. Based on this, a new energy management strategy based on Harr wavelet using variable decomposition layers is proposed. Finally, the test platform for two hybrid energy systems is constructed and the performance tests are completed. The test results show that under the UDDS condition, the average efficiency of Li-ion battery condition is improved by 4.13 % and the average efficiency of Li-ion battery-supercapacitor composite energy system condition is improved by 3.30 % compared with the single-energy Li-ion battery scheme affected by the instantaneous high power regulation of the supercapacitor. The average efficiency of the lithium battery condition is increased by 4.46 % with the purely electric flywheel, however, the average efficiency of the lithium battery-purely electric flywheel composite energy system condition is instead reduced by 9.90 % due to the low efficiency of the purely electric flywheel.