Page 221 - Applied Photovoltaics

EXE RCI S ES
10.1 (a) Give an overview of photovoltaic applications relevant to present
markets, explaining why photovoltaics are both suitable and
economical for each.

(b) What changes are likely to take place in future PV markets and
applications? What changes are needed in PV products to best access
these new markets?
10.2 (a) By use of a diagram, explain what is meant in interconnected
photovoltaic systems by the terms ‘source circuit’, ‘parallel string’,
‘series block’ and ‘substring’.
(b) For large systems with one bypass diode per series block, explain how
decreasing the number of series cells per substring can increase
system tolerance to cells failing by open circuiting.
(c) Explain how large currents can be prevented from flowing through
shorts to ground in large photovoltaic systems with multiple source
circuits.

(d) Explain how arcing can occur in large, high voltage photovoltaic
systems with multiple source circuits when an open circuit arises
between series blocks.
10.3 For a selected country, investigate the attitudes of those in charge of essential
services such as electricity generation and distribution, telecommunications,
railways and water supply to the use of photovoltaics? What changes are
required to enhance PV use and how might this occur?
10.4 Describe the components in a grid-connected residential photovoltaic system
and discuss issues relevant to the use of photovoltaics in this application.
10.5 Discuss the use of power conditioning circuitry available in Australia
(inverters, maximum power point trackers, DC-to-DC converters etc.)
Include:
x types and characteristics of power conditioning circuitry available in
Australia
x selection criteria
x supplies, costs
x economics of use
x benefits
x reliability.

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