Flexible battery storage system for smart grid

Pao Yue-kong Library Electronic Theses Database

Flexible battery storage system for smart grid


Author: Cheng, Lu
Title: Flexible battery storage system for smart grid
Degree: M.Sc.
Year: 2014
Subject: Smart power grids.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Electrical Engineering
Pages: v, 53 pages : illustrations (some color)
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2818305
URI: http://theses.lib.polyu.edu.hk/handle/200/8055
Abstract: As the energy and environmental problems become increasingly prominent nowadays, the distributed generation (DG) is undergoing a significant development all around the world. Microgrid is introduced in order to coordinate the contradiction between the large grid and distributed generators and to fully exploit the value and benefit that distributed generators bring to the grid and users. The grid-connected inverter plays a very important role between the grid and distributed generations, and has a critic influence in the interconnection performance of the distributed generations. This thesis concentrates on a control strategy and operation characteristics of an inverter-interfaced microgrid. The principles of P-f and Q-V droop control strategy were analyzed, the model structure designs and UI multiple feedback loop controller were given, and the models were established in Matlab/Simulink. The selection and design of model parameters were studied. With the implementation of the UI multiple feedback loop controller, the microgrid can export high-quality power under both grid-connected mode and isolated mode. When the utility fault occurs, the microgrid runs from grid-connected mode to islanding mode, and the designed controller will regulate the active and reactive power flow and enable power sharing between the paralleled micro sources in the microgrid. Also, the controller can make the conversion between different modes seamless. The simulation results show the validity of the proposed scheme.

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