A reactor arrangement for alternating electrical current

Abstract

The invention relates to a reactor arrangement for alternating electrical current. The reactor arrangement comprises different coils (105, 107) for positive and negative half-cycles of the alternatingelectrical current. The negative and positive half-cycles of the alternating electrical current are directed to the different coils with the aid of unidirectional electrical components (106, 108) such as, for example, diodes. The both coils are arranged to magnetize a common magnetic core element (104) in a same direction. The reactor arrangement further comprises at least one permanent magnet (109) that generates, into the magnetic core element, a biasing magnetic flux component having an opposite direction than that of magnetic flux components generated with the coils. Therefore, the biasing magnetic flux component generated with the permanent magnet relieves magnetic saturation of the magnetic core element. Hence, the size and the weight of the magnetic core element can be reduced.

Description

Technical field [0001] The invention relates to a reactor device suitable for alternating current, and to a method for providing inductive reactance for alternating current. Furthermore, the present invention relates to an electrical converter device having a reactor device. Background technique [0002] In combination with many electrical converter devices, such as frequency converters, between an inverter bridge arranged to generate, for example, a multiphase alternating voltage and an electrical system connected to the inverter bridge, and / or between the rectifier bridge and the AC Inductive electrical components are needed between the variable voltage networks. Inductive electrical components may be required, for example, to reduce the slew rate of the inverter's output voltage, overcurrent protection, reduce radio frequency emissions, and / or suppress harmonics of voltage and / or current. The physical size of the inductive electrical component can be reduced by providing the...

AI Technical Summary

Problems solved by technology

When the current amplitude exceeds the limit value, the magnetic saturation is suddenly relieved, and as a result, the impedance suddenly increases and the current amplitude is limited

However, the operation described above is strongly non-linear and thus generates a large number of harmonics in the waveform of the alternating current, whereas the operation of inductive reactance is largely linear and can limit the alternating current without generating significant harmonics

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