Abstract
The paper presents the results of an analysis of harmonic active power at the nodes connecting a 220 kVsupply network to three nonlinear high-power loads: an aluminum smelter shop, a pulp and paper plant and a railway traction substation. The main process equipment of the facilities is a source of harmonics. The analysis is performed on the basis of measurements. Measured current and voltage were used to calculate active power for harmonics 2—40. Based on the analysis, it was found out that the facilities are the sources of characteristic harmonics and generate the harmonic active power to the network only during part of the measurement time. For the other part of the time the harmonic active power flows from the network to the load of the facilities. The values of the harmonic active power flowing in both directions vary from several tens of watts to several tens of kilowatts. The paper presents the proposals on the use of harmonic active energy.
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