Converter, electrical polyphase system and method

Abstract

An electric machine comprises windings having first terminals and second terminals. At least one node exists to which one of the two terminals of one corresponding winding from multiple windings is electrically connected. The corresponding other terminal of the winding from the multiple windings is electrically connected to a phase terminal and a modular multilevel converter that comprises individual modules connected in series to form a ring. At least one tap portion can be arranged between two adjacent individual modules and provides the phase terminal to which the first or the second terminal of the winding from the multiple windings of the electric machine is electrically connected. The number of tap portions of the modular multilevel converter exactly corresponds to the number of windings from the multiple windings of the electric machine. Each individual module of the modular multilevel converter comprises an energy memory and a switch element, and the energy memories of the adjacent individual modules can be connected so that a voltage difference capable of being adjusted by a control unit according to a multi-phase rotation magnetic field curve can be provided between two adjacent phase terminals.

Description

technical field [0001] The invention relates to a modular multilevel inverter, an electrical polyphase system and a method for operating an electrical polyphase system. Background technique [0002] Conventional batteries (whose role should go beyond small electronics) are often constructed as firmly wired units, such as battery cells, made up of a number of individual components. Such batteries provide almost only DC voltage at one output. In contrast, most electrical consumers require an alternating voltage which has, for example, a harmonic voltage curve with defined frequencies, amplitudes and phases. Furthermore, the DC voltage above the state of charge is not constant. In order to be able to operate connected consumers at peak voltage and end-of-charge voltage and to draw the required power, these consumers must use expensive supply circuits. When the voltage required by a consumer is far from the voltage supplied by the battery, the power electronics (through a so-...

AI Technical Summary

Problems solved by technology

When only part of a battery fails, such as a battery cell, the entire battery is generally unusable

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