Estimation of distribution system load characteristics with time series data of PV system output

Estimating load characteristics is very important from the viewpoints of voltage control of a distribution system with dispersed generators such as PV systems. This paper presents an identification method of distribution system characteristics with time series data. While one of the authors has proposed a system identification method that uses output of interruptible generators as an external disturbance, its target was load frequency control of a power system. This paper discusses the application of the method to the estimation of distribution load characteristics using time series data of both PV output and line voltage. Basic characteristics of the method were studied based on simulation data; estimated power spectra of load fluctuation prove to closely agree with that of input load.