Case studies on mitigating harmonics in ASD systems to meet IEEE 519-1992 standards

Typical case studies are reported in this paper addressing the application of the IEEE 519-1992 guidelines to mitigate harmonics. The study discusses possible techniques to mitigate harmonics generated by nonlinear loads, especially variable frequency drives (VFDs), also known as adjustable speed drives (ASDs). The paper intends to show how one can apply IEEE 519-1992 within an industrial or commercial environment to minimize the effect of harmonics on the electrical system in a given plant. It is shown that the IEEE 519-1992 methodology can be applied at the point where a nonlinear load (ASDs in particular) connects to the AC power system. This would lead to solving harmonic problems within a facility in addition to making sure the IEEE 519-1992 standards are being met at the point of utility metering. Test results showing the performance of a new passive filter configuration which reduces the harmonic currents being injected back into the power system network to meet IEEE 519-1992 standards at the input terminals of the ASD are also presented