The paper solves the problem of centralized reduction of harmonic voltages at the nodes connecting traction substations on railway to the supply HV network via the passive C-type filters. The results of measurements at the connection nodes of traction substations to the supply network of the voltage quality indices that are due to non-sinusoidality are presented. Changes of the indices at different configurations of the supply network are analyzed. Mathematical expressions to determine parameters of the C-type filters, the algorithms for selecting network nodes where they will be installed are given. The parameters of the selected nodes for 220 kV network supplying traction substations with power and also the estimates of the efficiency of work of these filters for different network configurations are presented as an example. The active power losses in the selected filters are calculated.
Abstract. Power quality determines reliability of electrical equipment operation, performance of the assigned functions by it, service life. In the last years problem of power quality attracted increased attention because of power quality degradation and a great number of consumer complaints. Many problems of power quality control, such as determination of liabilities and responsibility of power suppliers and consumers for its quality, call for solution. The paper presents the types of damages caused by harmonics and the results of an analysis of harmonic active power at the node connecting an aluminum smelter block to a supply network. The analysis is performed on the basis of measurements. Measured current and voltage were used to calculate harmonic active power. It was found out that the aluminum smelter block generates the harmonic active power to the supply network only during part of the measurement time. For the other part harmonic active power flows from the supply network to the aluminum smelter block. The paper presents the proposals on the use of harmonic active energy for determination of the power quality distortion source and its contribution.
Abstract. The paper presents the results of studies on the harmonic active and reactive power at nodes of 110 kV and 220 kV networks. The studies were based on the measurements made at the node of 110 kV network supplying power to an aluminum plant and at the node of 220 kV network supplying power to railway traction substation. The supply networks belong to the Unified Energy Systems of Russia. Many other facilities with high-power nonlinear loads receive electric energy from these networks. They make their contribution to the formation of harmonic conditions across the networks. The measurements of currents and voltages were used to calculate active and reactive power for harmonics 2-40. The calculations show that although the considered facilities are the sources of harmonics and generate harmonic power to the supply networks they also receive harmonic power from them. The harmonic active power flows change directions during the measurements. Their values vary in a wide range and can reach several tens of kilowatts. The values of harmonic reactive power also vary in a wide range. They change the direction of the flow and affect the values of voltage, as a rule, at the characteristic harmonics of the nonlinear electrical equipment.
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.
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