(RA_{CAP_{TR}}) is the available/idle capacity of a transformer which has to be distributed by WF algorithm.
The purpose of this coordinated control step for reactive power is to allocate the reactive power demand appropriately based on the reactive power supply capacity of each transformer unit.
Several constraints such as energy balance, limited capacity of the transformer, air conditioners, gas boilers, absorption chillers, combined heat, and power and battery energy storage system are also incorporated into the model to guarantee the required specifications.
The grid power exchange minimum (( {P}_{grid}^{min }(t) )) and maximum (( {P}_{grid}^{max }(t) )) limits can be set as a large amount or the capacity of the transformer linking the microgrid and the main grid.
Open image in new window Fig. 5 Aggregated power schedule of Agg 1 and Agg 2. We note that the aggregated power schedule during time slots 45 to 48, i.e., 02 00 to 03 00, exceeds the allocated capacity of the transformer.
The three-phase load flow analysis is executed to obtain the sensitivity of feeder loss with variations in power loading, conductor length, and total capacity of distribution transformers.
Total capacity of substation transformers is 1094.5 MVA.
The capacity of choke transformers is 3 KVA, and the resistance of primary and secondary coils is R 1 = R 2 = 0.2 Ω.
The DSSR is defined as the set of all operating points that make the distribution system N − 1 secure, which takes into account the capacity of substation transformers and feeders, network topology and operational constraints [16, 20].
