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Power Battery Degradation Oriented To Research On Energy Management Strategy For Range Extended Electric Bus

Posted on:2017-07-06Degree:MasterType:Thesis
Country:ChinaCandidate:J F ChenFull Text:PDF
GTID:2322330482986490Subject:Control Engineering
Abstract/Summary:PDF Full Text Request
Energy crisis and environmental pollution have been two major problems in the world today. The development of new energy vehicles is an important means to solve these problems. Range extended electric vehicle(REEV) is the most promising vehicle configuration of new energy vehicles at the current stage.Compared to plug-in hybrid electric vehicle(PHEV), REEV has a relatively simple configuration, low oil dependence, and low emission, etc. Compared to battery electric vehicle(BEV), REEV not only reduces vehicle battery capacity and vehicle costs, but also solves the driving range problem. Therefore, REEV is an important development direction of new energy vehicles.In this paper, range extended electric bus(REEB) is studied at aspects of powertrain design and modeling, energy management strategy and energy efficiency analysis, and total cost analysis of ownership.At the aspect of powertrain design and modeling, the matching method is described in detail. The powertrain contains variety of power units and energy storage units, such as motors, generators, engines, and batteries, etc. Components properties and energy conversion characteristics of different operating modes are both considered during the match. For the following analysis, REEB powertrain model is established in the Matlab/Simulink.At aspects of energy management strategy and energy efficiency analysis,this paper presents a novel energy management strategy to improve the low energy efficiency of the current energy management strategy. The novel energy management strategy, PSR-RB, combines the advantages of global optimization strategies and rule-based optimization strategy, which can improve the powertrain energy efficiency and meet on-line application requirements. PSR-RB strategy was simulated in REEB powertrain model. The performance indicators increase significantly compared to the original strategy. For verifying the real-time performance, hardware in loop(HIL) test was conducted. Test results prove the strategy ability in real-time application.At aspects of life-cycle cost analysis, total cost of ownership(TCO) model has established. Combined with TCO model, REEB powertrain model and battery life model, the optimal objective is minimizing life-cycle cost with the battery life fading. According to the national policies and regulations, boundary conditions of battery replacement and the lowest life-cycle cost in different condition can be obtained. What's more, considering widespread concern problems during the actual operation, parameters sensitivity analysis are conducted including battery technology parameters, cash flow discount rate,electricity price(peak, valley, flat period), and government subsidies.
Keywords/Search Tags:range extended electric bus, energy management system, battery life model, energy efficiency analysis, dynamic programming algorithm
PDF Full Text Request
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