In order to determine the required current rating of the active switching devices for the
parallel and series portions of the back-to-back converter shown in Figure 31.28, the maximum
apparent power that each inverter will either supply or draw from the electrical system must be
known. These ratings will largely depend on the compensation objectives and to what limits
they are specified to maintain. Of the three voltage compensation objectives (voltage sag,
unbalanced voltages, voltage harmonics), the greatest power demands of the series inverter will
almost always occur during voltage sag conditions. For the parallel inverter, generally the
reactive power compensation demands will dominatethe design of the converter, as opposed to
harmonic current compensation.
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