Power Distribution Strategy of Hybrid Energy Storage Microgrid Based on Double-layer Filter
In order to solve the problem of poor cut-off characteristics of traditional first-order Butterworth filter in the power distribution of microgrid system,based on the analysis of the structure of microgrid and hybrid energy storage system,a power de-composition strategy of hybrid energy storage system based on double-layer filter is proposed.In this strategy,the first layer filter re-moves the extreme component of the system power fluctuation to prevent the microgrid from being impacted.The second filter intro-duces an improved second-order filter transfer function to improve the cut-off characteristics at the handover frequency and elimi-nate the integral effect of the first-order low-pass filter in response to high-frequency power.Simulation results show that compared with traditional power distribution methods,this strategy can optimize the output ratio of each energy storage device,improve the dy-namic response ability of the hybrid energy storage system,enhance the voltage stability of the direct current(DC)bus,smooth the output of lithium battery,reduce its charge and discharge depth,prevent the frequent fluctuation of state of charge(SOC)value of lithium battery,and prolong the service life of each energy storage device.
hybrid energy storagepower distributiondouble-layer filterpower fluctuationenergy management
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维普
