Aurora was contracted by UCP Choice to carry out a series of power system studies for 3 new 33kV, 5MW solar PV farms within the UK and for a number of different DNOs.

Aurora’s scope included undertaking a full G5/4 Stage 3 harmonic assessment of each site, requiring import of the existing DNO network model into Digsilent. Aurora modelled the background harmonics and PV array output before checking the harmonic distortion levels throughout the network for a variety of operating scenarios, as well as the system performance to harmonic resonance sweep.

In addition, Aurora also carried out a detailed P28 transformer energisation study using the PSCAD simulation package to determine the voltage disturbance caused by energising the transformers individually or as a group. This study also reviewed the long-term and short-term flicker created by the PV units on the network.