Page 187 - Decision Making Applications in Modern Power Systems

150 Decision Making Applications in Modern Power Systems

The first proposed case analyzed was a voltage control method in the
IEEE 13-bus using smart inverter functions. Results have shown that Volt/
Var control is a good choice for overvoltage mitigation, especially when this
control is applied to different buses with DG along the feeder. Alternatives
using Volt/Watt control and batteries for energy storage have also shown
excellent results for voltage management, although DG power curtailment
and investment costs are variables that can interfere with the overall
performance.
At last, the second case presented a series of harmonic studies focusing
on the impacts of aggregated linear loads modeling on the system impedance
and voltages. The results show that different modeling representations have
significant differences near the parallel resonant points, and load composition
may impact voltage distortion and system resonance. Moreover, capacitor
banks and resistive linear loads cause large impacts on harmonic resonances
and harmonic damping, respectively, and they should be precisely repre-
sented in the simulations. Harmonic studies usually have a minor concern for
DG connection; however, with the insertion of new types of loads and beha-
viors—for example, electrical vehicles, demand response, and electronic-
based loads—it is recommended doing harmonic studies for connection of
new distributed generators and capacitors for PFC.

Acknowledgment
The authors thank to CNPq, CAPES, FAPEMIG, and INERGE for partially supporting this
work. The authors L.C. Ribeiro Jr. and F.L. Vieira thank the scholarship grants received
¸
from CAPES [Coordenac¸a ˜o de Aperfeicoamento de Pessoal de N´ ıvel Superior Brasil
(CAPES) (Finance Code 001)].
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