Photovoltaics in distribution systems — Integration issues and simulation challenges

High penetration of PVs in distribution systems can causes a number of issues on the system. Determining whether or not an issue exists for a given distribution circuit with PV is a non-trivial task. Accurate knowledge regarding the conditions under which issues can be positively ruled out would be immensely beneficial for solar projects as this would eliminate the need for a costly and time-consuming system impact study. In this paper, we focus on the challenges associated with evaluating the types of systems for which potential PV related problems turn into actual problems. In this context, we summarize utility experiences with PV on their system as discussed during UVIG meetings and reported in the pertinent literature. Furthermore, we present simulation results of a PV integration study we conducted for CEATI and discuss the implications of simulation challenges and simplifying assumption often associated with these types of studies.