System Reduction of Power System with Penetration of Photovoltaic Generations

This paper presents a novel system reduction method which makes it possible to consider the impact of photovoltaic (PV) penetration on transient stability precisely. The object system for system reduction can be aggregated into a simple equivalent circuit by using the proposed method. The equivalent circuit consists of a lumped load model, a lumped PV model, and three equivalent impedances. Using the equivalent circuit, power flow into the object system when the system voltage changes can be analyzed without repeated power flow calculation of the original system. In order to verify the proposed method, this paper presents a numerical example of transient stability analysis with a one‐generator‐to‐infinite‐bus system model. The results of analysis indicate that transient stability considering PV penetration can be analyzed with high accuracy with the proposed method.