Effects of Photovoltaic Power Plants Grid Code Requirements on Transient Stability

Since photovoltaic (PV) power plants are becoming more prevalent on the grid, their participation in increasing grid stability seems necessary. Dynamic voltage support during fault times is a requirement of modern grid codes for integrating PV power plants into the grid. However, the effects of these requirements on other grid characteristics should be investigated. This article conducts comprehensive analyses of the impact of the reactive power injection rate of PV power plants to support the grid voltage on transient stability. Simulation is performed on an IEEE 9-bus system containing conventional synchronous generator (SG)-based power plants and PV plants using DIgSILENT to analyze the performance.