Scientists devise better way to harness power of solar panels

Researchers at the University of Waterloo have developed a way to better harness the volume of energy collected by solar panels.

In the study published in the journal 'IEEE Transactions on Control Systems Technology,' the researchers developed an algorithm that increases the efficiency of the solar photovoltaic (PV) system and reduces the volume of power currently being wasted due to a lack of effective controls.

"We've developed an algorithm to further boost the power extracted from an existing solar panel," said Milad Farsi, a Ph.D. candidate in Waterloo's Department of Applied Mathematics.

"Hardware in every solar panel has some nominal efficiency, but there should be some appropriate controller that can get maximum power out of solar panels," said Farsi.

"We do not change the hardware or require additional circuits in the solar PV system. What we developed is a better approach to controlling the hardware that already exists," Farsi continued.

The new algorithm enables controllers to better deal with fluctuations around the maximum power point of a solar PV system, which have historically led to the wasting of potential energy collected by panels.

"Based on the simulations, for a small home-use solar array including 12 modules of 335W, up to 138.9 kWh/year can be saved," said Farsi.

"The savings may not seem significant for a small home-use solar system but could make a substantial difference in larger-scale ones, such as a solar farm or in an area including hundreds of thousands of local solar panels connected to the power grid," said Farsi.

He further pointed out that the savings could be even more substantial under a fast-changing ambient environment or when the power loss in the converters due to the undesired chattering effects seen in other conventional control methods is taken into account.