It is proved that current harmonic increases as well as exceeds THD limit when PV is added to main grid. On the other hand, voltage harmonics remains under control of limit.
When you connected the PV to grid, you must add a filter to inject high quality current. The design of the filter is based on the power, switching frequency, Dc link voltage.
The ideal waveform of the grid voltage and grid current is the pure single frequency one. The presence of nonlinear loads causes harmonic distortion. Such harmonics are not useful for many loads and for the elements of the grid. Therefore, they are limited by regulation standards. Grid connected solar power stations generate electrical current and voltage which are not pure single frequency but have harmonies.
Yes, these harmonics are suppressed by filtering but still there remains residual harmonics barbecue the cost of filtering is relatively high. Similar to the harmonics introduced by nonlinear loads, the harmonics generated by the PVG must be also limited such that the total harmonic distortion must not exceeds the values set by the regulations
For more specific information on the topic please follow the link:.http://peandes.unex.es/archives%5CP137.pdf
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