The use of properly allocated capacitor banks has long been one of the main strategies
used to maintain electrical variables such as voltage, power factor and feeder loading within
acceptable levels. However, the constant presence of harmonics in the grid limits the
applicability of this strategy. In this context, this work proposes an a posteriori evaluation of
the Resonance Index to support the decision making process, in conjunction with the
multiobjective evolutionary algorithm, SPEA2, to solve the Optimal Capacitor Allocation
Problem (OCAP) in three-phase radial distribution networks considering the harmonic
resonance and amplification phenomena due to the presence of non-linear loads. A study of the
variation of the equivalent impedance of the network (driving point impedance) seen from the
allocation point of the respective capacitor bank, either by the variation of load during the day
or by the numerous maneuvers to which the system is subjected. The results presented here
were obtained from the IEEE 34-bus three-phase radial distribution network and the IEEE 123-
bus network, in which the models from three different harmonic sources commonly found in
real case scenarios were inserted. Finally, the convenience of the use of multiobjective routines
in solving the OCAP and the importance of the evaluation of resonance scenarios in order to
guarantee an adequate and safe operation of the system are highlighted.
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