Comparison of Optimization Model and Time-series Model for Intraday Electric Load Dispatching under Same Unit Commitment

Abstract

Day-ahead unit commitment (DAUC) and intraday-optimization of electric load dispatching (IOED) are widely used to simulate power system operations with high-level renewable power integration. However, operation plans made by IOED models might be infeasible in reality, because the IOED model inputs actual renewable generation in a whole day. In order to check the feasibility, this paper compares simulation results of an IOED model with results of an intraday time-series electric load dispatching model (ITED model). Both models use the same DAUC results. The IOED model was modelled as a mixed integer linear problem, and the ITED model was modelled as a rule-based control model. Annual simulation results indicate that in terms of the supply shortage, the difference between the IOED model and the ITED model was not so large, especially for large shortages. On the other hand, operations of the pumped storage hydro were less frequent in the IOED model than in the ITED model.