| Abstract |
This paper presents the topic of grid connected power converter operation during power transformerrecovery inrush current. The phenomenon is as a consequence of temporary voltage dip occurrence.Based on the measurements results and multiple simulations the authors show the relevance of thisphenomenon to the typical Fault Ride-Through (FRT) studies. In this study multiple simulations havebeen run in order to verify the error that can be potentially obtained by not accounting for transformersaturation. This error is expressed by prolonged FRT operation phase due to additional voltage sagoccurring after fault clearing. In the idealized case which was also studied, it has been found that therelevance of power transformer magnetizing curve implementation on the FRT study outcome isclearly visible. However, the model with no saturation in the studied configuration is not critical, dueto the fact that the additional post fault dip magnitude is small and short in duration. Therefore, thetypical FRT algorithm can handle such distortion without exceeding the specified limits. Nonethelessone should keep in mind that the idealized scenario where no saturation is included may vary from theactual output of the real inverter. |
