Analyzing a Non-Sinusoidal Response from a Real-World Solar PV

This letter presents an analysis of a non-sinusoidal response from a transmission-level photovoltaic (PV) solar power plant triggered by a local line outage in Dominion Energy's power system. The uniqueness of this response resides in the fact that its critical component is non-sinusoidal, and unlike typical scenarios, it does not stem from conventional nonlinear power system dynamics. It is also demonstrated how careful and systematic analysis of synchrophasor measurements in the plant, through time-series analysis techniques, can help illuminate the underlying mechanism leading to the atypical response observed.