Electrical Studies for Renewable Energy Grid Connection

Harmonics are created by non-linear devices, which may distort the voltage (or current) waveform. The most common non-linear devices are those fed by power electronics (frequency inverter, rectifiers, converters, etc.), essential components of both wind and photovoltaic generators. 

Voltage harmonic distortion has negative implications for the system, such as wire overheating, among other. Therefore, when connecting a power plant to the electric system, it is important to study how much distortion the farm produces on the network. System operators set maximum limits on the network distortion that each plant can produce, thus limiting harmonic distortions.

System impedances play a key role regarding voltage harmonics; hence, this is evaluated at the PCC to detect possible hazardous resonances.

Harmonic currents and voltages at the PCC and at the MV busbars will be analyzed and the necessary corrective measures and solutions in case of non-compliance with the Grid-code will be proposed.