Low-speed disk-type doubly-fed generator and its excitation current application method

Abstract

The invention discloses a low-rotation-speed disk-type doubly-fed generator and an exciting current applying method thereof. The low-rotation-speed disk-type doubly-fed generator comprises a motor housing and a rotor shaft. The motor housing is provided with a stator disk. 4N+1 pieces of cylindrical stator magnetic steel are successively arranged along the circumferential direction of the stator disk. Each piece of stator magnetic steel is wound by an enamelled coil, and all the enamelled coils are connected to form an output coil. A rotor disk is fixedly arranged on the rotor shaft. Two groups of rotor magnetic steel, which are radially symmetric relative to rotor disk, are arranged on the circumferential direction of the rotor disk, each piece of rotor magnetic steel is also wound by an enamelled coil. The enamelled coils of the first group of rotor magnetic steel are connected to form a first exciting coil, and the enamelled coils of the second group of rotor magnetic steel are connected to form a second exciting coil. The low-rotation-speed disk-type doubly-fed generator overcomes the defects that the rotation speed needed by a routine non-salient pole doubly-fed generator is too high and grid connection is difficult, the energy conversion efficiency is high, and an important technical support is provided for collection, power generation and reliable grid connection of low-quality energy such as micro wind and micro water.

Description

technical field [0001] The invention relates to a generator, in particular to an AC excitation disc generator. Background technique [0002] As an important part of the current energy sources, renewable energy sources such as breeze and water have important strategic significance for the sustainable development of the national economy and the overall progress of society. [0003] In the prior art, in the field of wind power generation, for power generation with small capacity, permanent magnet generators are usually used to generate power, and then various power electronic inverter devices are used for inverter grid connection; There are shortcomings such as the high cost of the converter and the low reliability of the generator. [0004] Therefore, in the case of large capacity, the hidden pole doubly-fed generator is often used to excite the rotor with AC instead of conventional DC excitation, and the frequency of the excitation current is superimposed on the output, so t...

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Problems solved by technology

[0006] In view of this, the present invention provides a low-speed disk-type doubly-fed generator and its excitation current application method to solve the shortcomings of the existing hidden-pole doubly-fed generators that require extremely high speed, difficulty in grid connection, and low conversion efficiency.

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