Abstract
Special system studies are needed to assess the different preliminary designs of solar photovoltaic (PV) projects. One of these is a Temporary Overvoltage (TOV) study. The main purpose of a TOV study is to evaluate the capability of the surge arresters (SAs) within the substation. To assess the capability of the SAs accurately, a detailed electromagnetic transient (EMT) model of the project has to be built. With the detailed EMT model, which has a large number of inverters, the run time of the model becomes prohibitive even for a single scenario. In this paper, we propose a method to systematically reduce the order of the EMT model at the substation level thus making the model suitable for TOV studies. The response of the reduced order model is then benchmarked against the response of the full order model of an 80 MW solar PV project for various TOV scenarios. Simulation results show satisfactory agreement between the response of the detailed model and the response of the reduced order model. Additionally, the run time of the proposed reduced order model is less than the run time of the full order model by a factor of ninety six.
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