Abstract
Power quality improvement is necessary to maintain the perfect and safe operation of sensitive equipment, especially for the low-voltage three-phase three-wire (3P3W) of three-phase four-wire (3P4W) distribution networks. The daily increments of the nonlinear loads (NL) in these networks are helping utilities reduce electrical consumption by eliminating large, inefficient loads. Their electronic front ends make these NLs more productive, but they significantly enhance the harmonics injection into the distribution network. This has largely been ignored, as most of the existing distribution loads are still linear in nature with a unity power factor. However, the increasing proliferation of NLs in 3P4W may minimize these loads but significantly deteriorate power quality. Therefore, an investigation is needed for the combined effect of these modern loads. This chapter presents a method to reduce the influences of NLs of the 3P4W low-voltage distribution network. Different compositions of the linear and nonlinear loads have been simulated in the MATLAB environment for investigation. The obtained results reveal that power quality has been successfully improved with meeting IEEE 519 standards.
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