The Effect of Large-Scale PV Power on Stability of Power System

T349 access of photovoltaic (PV) power generation into power grid brings about both static and transient stability problems to the power system. This paper studies the effect of large-scale PV power on load flow, power-angle stability and reactive power voltage support. Based on an actual project of 200MWp PV power generation, an 8-nodes power system model is built. The simulation result shows that PV power disrupts load flow balance, and even causes power limitation exceeding. Besides, components' sudden malfunction near by the access point may lead to instability of power-angle and breakdown of voltage. The effect is also related to the definite grid environment including the specific distribution of the power and load. Considering with measures in response to safety and stability problems, it is prioritized to cut off the PV power as soon as the malfunction happens.