<p> In this thesis, the author describes various evaluation criteria, in particular the C-rate (charge/discharge-rate), of energy storage (ES) systems to explain the efficiency and technical benefits of battery-ultracapacitor hybrid energy storage (HES), and the technical characteristics of subsequently derived short-duration and long-duration type ES. In addition, for effective use of energy storage, a straightforward state of charge (SOC) correction method for energy neutral operation is proposed, and through a simple comparative example of ES operation, the effectiveness of HES in relation to simple ES is explained. A case is considered in which a hybrid ES controls the wind power ramp rate to comply with the regional system operator&rsquo;s smoothing requirement, and an operation method is suggested through simulation. The simulation is carried out using a frequency spectrum analysis of wind power output profile and the C-rate of the hybrid storage system, and an energy neutral operation method for ES is proposed based on the simulated charging/discharging power sharing profile and SOC variations of the Li-battery and the ultracapacitor. </p>

<p> Bangladesh has experienced significant energy shortfalls in the electrical grid since at least 2005 and the majority of people living outside urban areas do not have access to electricity. Solar energy is an attractive form of supplemental electrical energy. One approach to implementing solar electric energy systems in Bangladesh is the Solar Home System (SHS), an off grid Photovoltaic (PV) solar energy system. With over 3 million solar home systems already installed, it is an increasingly important component of rural energy. The SHS as it currently exists only enables limited loads, such as lights and televisions, is relatively expensive and has some significant technical issues. </p><p> This research study attempts to explore how distributed PV can be improved, using Bangladesh as a case study. Literature is reviewed to determine interactions and elements of distributed PV systems. A quantitative Social, Technological, Economic, Environmental and Political (STEEP) index is developed. A software program called <i>poplar</i> is developed to evaluate the existing Solar Home System using the proposed STEEP index. This is compared to an alternative topology incorporating distributed energy storage elements into loads to provide flexibility and scalability in system usage and reliability. The developed model simulation indicates that implementing distributed energy storage elements allows reduction of PV module and storage size. While there is significant uncertainty in the cost and environmental impact of the power electronics, this smaller sizing is correlated with total reduction in system price and environmental impact. The conclusion to this study is that the current SHS configuration may be better optimized by incorporating distributed energy storage into the loads.</p>

<p> Due to the increased demand for reliable and resilient controls in advanced power generation systems, new control methods are required to tackle traditional problems within these systems. This work discusses a control method and an estimation method for advanced control systems. The control method is sliding mode controls of a higher order, which is used to control the nonlinear wind energy conversion system while lessening the chattering phenomena that causes mechanical wear when using first order sliding mode controls. The super-twisting algorithm is used to create a second order sliding mode control. The estimation method is the derivation of a Resilient Extended Kalman filter, which can estimate and control the system through sensor undergoing failures with a binomial distribution rate and known mean value. Simulations on these dynamical systems are presented to show the effectiveness of the proposed control methods; the former is applied to a wind energy conversion system and the latter is applied to an single machine infinite bus. Both methods are also compared with more traditional methods in their respective applications, those being first order sliding mode controls and the Extended Kalman filter. </p><p>

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, December 1990. / Thesis Advisor(s): Titus, Harold A. Second Reader: Michael, Sherif. "December 1990." Description based on title screen as viewed on March 30, 2010. DTIC Descriptor(s): Heat Transfer, Theory, Theses, Costs, Heating Elements, Fluid Dynamics, Photovoltaic Effect, Solar Heating, Swimming, Optimization, Installation. DTIC Identifier(s): Swimming Pools, Solar Heating, Photovoltaic Supplies, Filter Pumps, Theses. Author(s) subject terms: Optimization, Solar Heating, Photovoltaics. Includes bibliographical references (p. 57). Also available in print.

The thesis is focused on cogeneration units on vegetable oil. The first chapter contains basic information about the production, supply and consumption of electric energy in the Czech Republic and about renewable energy sources. The following chapter is devoted to possibilities of use oil kinds of phytomass in the Czech Republic, or products made from them. Next chapter is mentioned on legislation allowing the use of used cooking oils for energy purposes. It contains a summary of the laws and regulations and options regarding subsidies for electric and heat power. The main objective of these chapters is to explain the issue of the establishment and operation of cogeneration units on vegetable oil. The following chapters are devoted to the design and study of simultaneously operated cogeneration unit on the vegetable oil with a combustion engine and the calculation of economic operation running. The reason of study is to evaluation, which on based of the input values and calculation methods determine the economic efficiency of the project cogeneration unit on vegetable oil under mode purchase price and mode green bonus. Appreciation is also given to the overall legal review and responsibilities of cogeneration units on vegetable oil.