Distribution Function Instead of Steady-State Assumption in Time-Series Simulation

Research output: NRELPoster


The quasi-steady-state assumption in time-series simulation is inadequate to model phenomena of interest to energy system integration such as inverter clipping, sell-back of excess electricity to a utility and utility hosting capacity, and battery throughput. Researchers are working on stochastic modeling, higher-resolution time series data, and machine learning approaches to address this need. This poster describes a distribution function that allows a maximum value, minimum value, and shape to the curve that can vary within each time-step based only on data inputs at the resolution of that time step (eg. Hourly). The distribution function is not used to synthesize high-resolution data, rather scalar integrals are used to calculate the quantities of interest within each time step. The form of the distribution function shows significant reduction in error when compared to 1 minute data and commercial software employing the distribution function (HOMER Pro version 14.3 and higher) shows a much improved estimate of inverter clipping in an example.
Original languageAmerican English
StatePublished - 2022

Publication series

NamePresented at the PV Performance Modeling and Monitoring Workshop, 23-24 August 2022, Salt Lake City, Utah

NREL Publication Number

  • NREL/PO-7A40-83733


  • battery
  • energy
  • integration
  • inverter


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