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Title: Dynamic Control in Energy Storage Augmented Renewable Energy System
Keywords: Bi-directional Converter, Energy Storage, Dynamic Power Control,Dual Active Bridge, Wide Power Transfer, Hybrid Modulation
Issue Date: 24-Jan-2011
Citation: ZHOU HAIHUA (2011-01-24). Dynamic Control in Energy Storage Augmented Renewable Energy System. ScholarBank@NUS Repository.
Abstract: This thesis reports the investigation of dynamic control in energy storage augmented renewable energy system. To active control the power flow from energy storage, Dual Active Bridge (DAB) bi-directional converter is designed and implemented. With proposed hybrid modulation, the DAB converter achieves wide power transfer under various operating points. The feedback linearization controller then is implemented for DAB to regulate DC bus voltage in facing of nonlinearities in control loop. Further, Interleaved Current Fed Full Bridge (ICFFB) converter is implemented for interfacing renewable energy and DC bus. Passivity based controller is investigated for purpose of achieving wide bandwidth and stable control in a wide range. After evaluating the individual converters for interfacing both renewable source and energy storage, a dynamic controller is proposed to coordinate the power flow between the parallelled renewable source and energy storage. The designed controller utilizes the power from renewable source as much as possible while regulates the output voltage by energy storage system. Experimental results show the proposed dynamic control function well. To interface the high power energy storages in micro-grid application, a family of modular interleaved bi-directional DAB converters are proposed and controlled. Simulation results verify the proposed converter has minimum input and output ripple, great flexibility and high power capability.
Appears in Collections:Ph.D Theses (Open)

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