Results of the research into the harmonics of loads connected to the nodes of high voltage network

Abstract

Abstract. The paper presents the results of the studies on measured parameters of harmonics for the complex loads connected to the nodes of the high voltage network. The measurements were made at four nodes of the 110-220 kV network. The complex loads include residential, commercial, industrial and tractional consumers. The considered nodes are the connection points of the railway substations to the feeding network. The paper demonstrates the specific features of the harmonic conditions.

Specific Features of Harmonic Conditions at the Node Connecting a Pulp-And-Paper Mill to a Supply Network

“…In the last decade intensive measurements of harmonics parameters have been continued, which is explained by the emergence and widespread use of new nonlinear electric equipment and increase in the values of current and voltage harmonics in the networks. For example, the results of measurements at the network node supplying the nonlinear loads of the retransmission TV stations are presented in [8]; the results of measured parameters of the harmonics generated by energy saving lamps are presented in [9]; the harmonics measured in the medical center and their impact on the work of the medical equipment are indicated in [10]; the results of large-scale measurements of power quality indices in the 110 kV networks of Siberia, which cover 23% of Russia's territory, are demonstrated in [11]; the results of the studies on parameters of harmonics for the complex loads connected to the nodes of the 110-220 kV networks are presented in [12]; the results of an analysis of harmonic active power of high-power nonlinear loads connected to the 110-220 kV networks are given in [13]. The measurements confirmed the presence of harmonics in the electrical networks.…”

An algorithm for modeling nonlinear loads based on field measurement parameters

“…Measured h I , Ih Ih , Uh Uh represent time series of random variables. The analysis of measured data in [16], [17] shows that modeling of nonlinear load should include analysis of directions of harmonic currents and then development of models of active and reactive harmonic currents based on the results of the analysis of current directions.…”

Modeling of nonlinear loads in high-voltage network by measured parameters

“…The previous analysis of measured data in [2], [6]- [8] shows that modeling a nonlinear load should include two stages:…”

“…Duration of measurements should be determined individually for each certain case. Since the parameters of harmonic conditions in high-voltage networks vary randomly [6]- [8] it is necessary to analyze them by the methods of mathematical statistics.…”