11 _PV_systems - ELEG620 Solar Electric Systems University...

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Unformatted text preview: ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner Photovoltaic Systems ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner Photovoltaic Systems We will look in more detail at the components of PV systems in a little while but first we want to understand some of the larger issues involved- Central issues in PV systems- Characteristics of Energy Systems in General- Characteristics of PV Systems- Types of PV Systems- Overview of systems design ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner Central Issue • We need to understand how the interaction between the components of our system affects the power produced, the cost and the reliability of the system • This means that we are considering the following issues: – Matching between components and the losses in components – Possibly a large range in operating conditions; variability of input, temperature, other factors – Component reliability; PV modules have 20+ year warranty. What about other components? – To provide the best solution for the application a trade off between performance, availability and cost is found • Therefore, the analysis of a system and also a systematic method of designing systems are critical ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner • The central issues for any energy system are: – Distribution – Cost – Reliability • Current energy systems: – Vast majority (>99%) of energy generated by mechanical generators. Mechanical energy source varies, ~ 90% is thermal to mechanical and the remainder is mostly hydro. – Load characteristics • Peak load • Base line load Energy Systems ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner Energy systems Need some parameters in order to effectively judge a systems performance • Availability: fraction of time that load is available compared to time load is required – Critical availability requires availability > 99% – Availability of 95% for conventional applications – Loss of load probability = LOLP = 1 – A (availability) – sometimes also called loss of power probability • Capacity factor – The ratio of the electrical energy generated, for the period of time considered, to the energy that could have been generated at cts full-power operation during the same period – Useful in comparing technologies and is a standard figure of merit in electrical generating systems ELEG620: Solar Electric Systems University of Delaware, ECE Spring 2009 S. Bremner Energy systems Parameters to judge system performance • Reliability – Probability of system being inoperable due to breakdown – In general, mechanical systems introduce reliability issues – Temperature a contributing factor in reduced reliability • Operating and Maintenance – Complementary to reliability with a trade off between the two in many systems – Cost of operating and maintenance can vary dramatically...
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This note was uploaded on 12/14/2011 for the course ELEG 620 taught by Professor Honsberg,c during the Fall '08 term at University of Delaware.

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11 _PV_systems - ELEG620 Solar Electric Systems University...

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