IEEE 519-1992 pdf free

04-29-2021 comment

IEEE 519-1992 pdf free.IEEE Recommended Practices and Requirements for Harmonic Controlin Electrical Power Systems.
IEEE 519 Single-Phase Inverters. The single-phase inverters for dispersed generation gener-ally are rated for less than 10 kW and typically would cause no problems for a utility in smallnumbers.As their use increases, however, large numbers of inverters tied to the same feedermay cause problems if the inverter’s harmonics are excessive.
Three-Phase Inverters. The threephase inverters for dispersed generation are typ-ically rated at 10 kW through 1 MW and are more likely, at least in the near term, to causeunacceptable utility wave forms if the inverters’ output wave forms contain high percentagesof harmonics.As with the single-phase inverters, the threephase inverters may be line-com-mutated or self-commutated (sometimes called force-commutated) topologies. Also, as withthe singlephase inverters, the output harmonics are dependent upon many variables. The dcoperating voltage level for these inverters varies over a wide range for most renewable energysources. These variations are dependent upon weather, time of day, temperature,trackingalgorithms, aging of collectors, and many other uncontrolled factors.
Additionally, ac electric utilities may have undesirable effects on the output of the inverter.Variables such as ambient utility harmonics,unbalanced line voltages, unequal phase separa-tion, high and low levels of ac voltage, and line impedances are several variables that affectthe output harmonics of the inverters.
Electronic Phase Control. Control of power to loads by phase control of thyristors willcreate harmonic currents. The TCR discussed in 4.3 is simply a special case of electronic control wherein the power factor is essentially zero.Heating loads,which have nearly 100% dis-placement power factor,sometimes are controlled by phase control of thyristors. ‘The waveshape will differ from the 0% power factor case, but only oddorder harmonics are still pro-duced, although with different magnitudes.
Except for the TCR application, loads usually are neither pure inductance nor pure resis-tance.For the general case of loads with power factors other than 0% or 100%, harmonic max-imum magnitudes will lie between the values of these pure cases.Pelly [B23] has equationsfor the general case that may be used to calculate harmonic current magnitudes.IEEE 519 pdf download.

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