Study on the Influence of Large-Scaled Photovoltaic Grid-Connection on the Transient Stability and Countermeasures

With the continuous growth of grid connected photovoltaic capacity, the influence of photovoltaic (PV) on the transient stability and corresponding countermeasures has become an important research topic. In this paper, the active and reactive power characteristics of PV unit and its grid connected system during rapid voltage dropping and lifting are analyzed, and the influence of different control modes on these characteristics are analyzed firstly. On this basis, aiming to the sending system with conventional generator and photovoltaic, the influence of PV on transient stability is analyzed, and countermeasures are proposed. Simulation results got from Hetian area of Xinjiang Uygur autonomous region verified that the proposed countermeasures can improve the transient stability of sending system with conventional generator and photovoltaic effectively, and these countermeasures provide technical solution to enhance the acceptance capacity of photovoltaic power.