AdvancedTopic 81 of 106Electrical Engineering
Solar photovoltaic systems
Cells convert sunlight into DC power, with MPPT maximising output.
In depth
PV cells convert light into DC via the photovoltaic effect in p-n junctions. Module output depends on irradiance and temperature (voltage falls ~0.4%/°C). MPPT algorithms track the max power point; inverters feed the grid. Efficiency 18–23% for silicon modules.
Key points
- I-V and P-V curves
- Series strings and parallel arrays
- Shading and bypass diodes
ExampleA 400 W panel at 1000 W/m² gives rated output only in standard test conditions.
What is Solar photovoltaic systems?
Cells convert sunlight into DC power, with MPPT maximising output.
Why is it important to understand solar photovoltaic systems?
Solar cells are a leading source of new power, so the design of their inverters and maximum power tracking determines how much energy is harvested.
What is maximum power point tracking?
A control method that adjusts the operating voltage of a solar panel so it always operates at the point of maximum power, which changes with sunlight and temperature.
Why does shading reduce output so much?
A shaded cell can act as a load and reduce the current of the whole string, so bypass diodes are used to limit the loss.
How is Solar photovoltaic systems used in practice?
Typical applications include sizing an array and inverter for a rooftop house installation, using maximum power point tracking to get the most energy from a panel and designing the cabling of a string of panels to avoid mismatch losses.
What should I learn before Solar photovoltaic systems?
Study "Renewable integration" first (topic 80 of 106 in Electrical Engineering). It covers the groundwork this topic builds on.
What are the key points of Solar photovoltaic systems?
I-V and P-V curves. Series strings and parallel arrays. Shading and bypass diodes.
Can you give an example of Solar photovoltaic systems?
A 400 W panel at 1000 W/m² gives rated output only in standard test conditions.
What comes after Solar photovoltaic systems?
The next topic is "Wind turbines", which builds directly on this one.
How difficult is Solar photovoltaic systems?
It is classed as Advanced in Electrical Engineering (topic 81 of 106). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Electrical Engineering.