الفهرس Only 14 pages are availabe for public view
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Abstract
This thesis presents a complete study of performance and design wind energy system accompanied with battery storage. First, this thesis introduces a complete design of wind energy system (WES) accompanied with battery storage. Anew proposed computer program has been designed to compare the output of the WES for different sites, the optimum number of wind turbine generator (WTG) and determine the techno economical design of WES suitable for any site in the Egypt. The proposed computer program has been applied on selected Egyptian sites such as Zafarana, Hurghada and Salloum. This application has been carried out using different types of WTG. from the results of these applications it is found that the best Egyptian site for WES is Zafarana and the most techno economical WTG for it is the type of Gamesa(G87). The ECF of WES under above conditions is 0.015 $/kWh. Also, this thesis includes an analysis of permanent magnet synchronous generator coupled wind turbine and battery bank storage system interconnecting to variable loads. Gearless, direct drive wind generator running at low variable speed is connected to variable loads at constant voltage via three phase rectifier, buck boost converter and SPWM inverter. Isolation of the load and wind generator is obtained through the frequency converters (SPWM inverter) connected via a dc link. The dc link voltage is maintained constant by the generator side converter while the load voltage is maintained constant by the load side converter thus ensuring the power transfer from the source to load. Battery bank connected to the dc bus store extra energy at high wind speeds or low demand and supply the deficit at low wind speeds or peak demands. MATLAB simulation of the tested system with step by step validation of the individual control models has, with some limitations, suggested acceptable performance. Power transfer from wind to the loads and/or battery bank based on constant dc bus voltage irrespective of changes in wind within variable power operating limits of the wind turbine, is validated by simulation results.The thesis contains six chapters can be summarized as follows: Chapter one: This chapter presents an introduction about wind energy and includes the types of wind turbines Chapter two: This chapter presents an introduction about conventional and renewable energy and includes previous work. Chapter three : This chapter introduces a proposed computer program for optimal design of a WES. A proposed computer program has been designed to determine an optimum number of WTG Many WTG types have been introduced to the computer program. This program has a subroutine which by using it the optimum operation of WES can be determined hour by hour through the year. Then, the monthly surplus energy, monthly deficit energy and yearly purchase or selling energy to or from EU can be estimated. Chapter four:
This chapter describes the simulation on the 850 kW Wind Turbine Generator (WTG) driving low speed Permanent Magnet Synchronous Generator (PMSG) using MATLAB/Simulink program. The system consists of wind turbine model, permanent generator, three phase diode rectifier, buck boost converter, voltage source inverter, charge controller and lead acid battery. The low speed PMSG has been used to eliminate gear box to achieve high efficiency. Chapter five: This chapter introduces a proposed computer program for the selection of best wind turbine which is based on minimum price of the generated KWh from the WES. Chapter six: This chapter includes conclusions obtained from the study and the suggested future work.