Determining The Impact of Photovoltaic Generation on Power Systems Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/g445ch00v

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  • The National Conference of State Legislatures NCSL declares that 29 states have been active in adopting and increasing renewable portfolio standards. Present renewable portfolio standards require utilities to increase integration of renewable energy sources such as photovoltaic (PV). The increased penetration of PV systems is expected to destabilize the power system. Therefore, this thesis studies the steady state voltage of Western Electric Coordinating Council (WECC) as the penetration level of the PV system increases to find the point where the penetration level makes the system unstable. In addition, this study serves to pinpoint the violated transmission lines as the penetration level increases, while also identifying why this violation occurs. The study is divided into two scenarios: integration of a rooftop only PV system at unity power factor and integration of both rooftop and utility scale PV systems. The study uses MATpower simulation program to solve the system power flow for each scenario. The results show that when we integrate a rooftop only PV system, the steady state voltage in the light loaded buses becomes unstable as the penetration level increases. However, integrating both rooftop and utility scale PV systems enhance the system stability. Also, the transmission line violations are observed while PV system penetration level increases.
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