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SERTS > PV > Flashcards

PV Flashcards

1
Q

Direct radiation generator

A

(Unshaded sunshine hours/# of sunshine hours per day) * direct radiation

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2
Q

Total radiation generator

A

Diffuse radiation + direct radiation

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3
Q

Radiation losses

A

global radiation - total radiation

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4
Q

IV curve

A

relationship between voltage and current

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5
Q

What are important points in the IV curve?

A

Short circuit current: I sc = I max, V =0

Open circuit current: V oc = V max, I = 0

Maximum power point Mpp = P max : Vmp & Imp

If pv cell is operated at Vmp & Imp, the maximum power is produced

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6
Q

Fill factor

A

measure of quality of solar cell

(ImpVmp)/(IscVoc)

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7
Q

Efficiency n

A

generated power / power of incident sunlight

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8
Q

Generator area

A

modules * module area

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9
Q

theoretical annual energy yield

A

generator area * global radiation

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10
Q

real annual energy yield

A

theoretical annual energy yield * efficiency

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11
Q

Power

A

I [A]*V [V]

–> from IV-curve

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12
Q

Azimuth Angle

A

angle between North and the sun (or moon)

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13
Q

How do you determine the global radiation?

A

diagram of azimuth angle and tilt angle

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14
Q

How do you do a shade analysis?

A

using the Solar Orbit Diagramm: azimuth & elevation angle

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15
Q

What is the elevation angle?

A

tan = opposite side (vertical)/adjacent side (horizontal)

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16
Q

How do you determine the share of your own consumption?

A

installed pv output/electricity consumption

17
Q

How does a PV cell work?

A
  • direct conversion of solar radiation into electricity
  • using semi-conductor - materials
  • semi conductors form space charge region: pn junction
  • positive space charge region in p-region
  • negative space charge region in n-region
  • when load is connected, electrons start flowing
  • electrons recombine with holes in p-region
  • PV gives DC
18
Q

What possibilities are there to increase the share of own consumption?

A
  1. Generation → Equip PV modules with a tracking system
  2. Consumption → Adjusting the consumption to the generation
  3. Battery storage → Increase storage capacity
19
Q

Law of series

A

U total = summe U

I = I1 = I2 = I3

20
Q

Law of parallels

A

U total = U1 = U2 = U3

I total = Summe I

SERTS (8 decks)

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