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Study On Sizing And Energy Management Strategy Of Hybrid Energy Storage System For Hybrid Ship

Posted on:2020-02-26Degree:MasterType:Thesis
Country:ChinaCandidate:Z H ZhangFull Text:PDF
GTID:2392330620962580Subject:Marine Engineering
Abstract/Summary:PDF Full Text Request
In recent years,energy and environmental issues have drawn more and more attention from society,thus the application of clean energy in the marine industry has been a spotlight.The hydrogen fuel cell hybrid power system has many advantages such as high energy efficiency and no pollution.However,the hybrid power system performance is limited by the lithium battery short lifetime and low power density.To solve the issues,battery/supercapacitor(SC)hybrid energy storage system(HESS)has been considered as a solution,which has both high energy density and high power density.In this thesis,the fuel cell-HESS hybrid system is considered as the research object,the problem of the design energy management strategy and sizing HESS for that system based on energy efficiency,power quality,and battery durability are investigated.The research work of the thesis provides a theoretical reference for the optimal design of the fuel cell hybrid system,and the proposed methods could be tailored to optimal other hybrid power systems.The specific research contents are as follows:First,a ferry is retrofitted from a fuel cell/battery hybrid power system to a fuel cell/HESS hybrid power system.The topology and operating modes of the HESS are determined by in-depth analysis of three type HESS topologies.The topology of the ship DC power system and the principle of traditional DC droop control are explained,and the limitations of the traditional DC droop control method are analyzed.By comparing several literatures' DC droop control methods,an improved DC droop control method based on voltage compensation and current compensation is proposed to control the ship DC power system.The improved DC droop control algorithm is verified by simulation experiments.Then,regarding the design energy management strategy problem of the hybrid system with the HESS,an energy management strategy considering the operating conditions of the ship is proposed.In this strategy,the support vector machine(SVM)is used to discriminate the ship's working condition,and the corresponding low-pass filter is selected according to the working condition.The low-pass filter is used to split the power signal,and the supercapacitor is controlled to bear the high-frequency part of the power signal,thereby prolonging battery life.As the design energy management strategy is closely related to the sizing problem,the whale optimization algorithm is used to joint optimize energy management strategy and capacity selection.Finally,a hybrid power experimental platform is used to verify the proposed energy management strategy.The experimental results show that the proposed algorithm is reliable and effective.
Keywords/Search Tags:Hybrid ship, Energy management strategy, Sizing battery/supercapacitor, Hybrid energy storage system, Support vector machine
PDF Full Text Request
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