Security Constrained Unit Commitment and Economic Dispatch applied to the Modified IEEE 39-bus system Case

Abstract

The operation schedule of the power generation units in electrical power systems is determined by the optimisation problem known as unit commitment (UC), aiming at minimising the total cost considering the generation constraints. To obtain a feasible solution from the network perspective, the security-constrained UC (SCUC) problem has been defined, in order to embed the network constraints in the optimisation problem as well. Also, the higher penetration of renewable energy sources (RES) has increased the difficulty of UC problem, mainly due to the uncertainty and the high variability of RES. This paper proposed a SCUC with economic dispatch (SCUCED) optimization developed in two stages. The first one is the solution of a merit-order based zonal day-ahead market (ZDAM) optimization in order to define a preliminary generation schedule. In the second stage the SCUCED is solved based on AC load flow routines and sensitivity factors to embed the full network representation. The approach is applied to a modified version of the IEEE 39-bus test system.

Short Circuit Current Constrained UC in High IBG-Penetrated Power Systems

“…For the static analysis, the parameters of transmission lines, loads are available in [25]. The load and renewable generation profile in [26], [27] is adapted for the simulation during the considered time horizon. The characteristics of thermal generators are given in Table I while considering the data in [27], [28], with their location being Bus {30, 37}, {31, 32, 33, 34, 35, 36, 38} and {39} respectively.…”

“…The load and renewable generation profile in [26], [27] is adapted for the simulation during the considered time horizon. The characteristics of thermal generators are given in Table I while considering the data in [27], [28], with their location being Bus {30, 37}, {31, 32, 33, 34, 35, 36, 38} and {39} respectively. Other system parameters are set as follows: load demand P D ∈ [5.16, 6.24] GW, load damping D = 0.5%P D /1 Hz, base power S B = 100MVA.…”