Suppression of emissions radiated from solar cells in photovoltaic power generation system

We have investigated several methods for suppressing the electromagnetic waves radiated from solar cells, which can affect broadcast and telecommunication systems. We focused on the direction of the current in a solar cell module and investigated whether the radiated electric field can be suppressed by alternating the current directions when two or more modules are used together. Comparison of the simulation results for three suppression methods with those for a fundamental method in which there is no suppression showed that a symmetric feeding point method can diminish the electric field radiated in the front face direction and that a reverse feeding point method can suppress it by about 20 dB in both the front and side face directions in comparison with the fundamental model. To obtain an even larger suppression effect, we investigated a suppression method combining these two methods for use with several modules in which the current directions in the solar cells are symmetric. We found that the suppression effect was about 20 to 50 dB with this combined suppression method.