Independent brushless doubly-fed generator negative sequence voltage suppression system under imbalance load

Abstract

The invention discloses an independent brushless doubly-fed generator negative sequence voltage suppression system under imbalance load. Firstly, a power winding negative sequence voltage component isworked out through a power winding positive and negative sequence voltage detection module; next, the negative sequence voltage is controlled to be zero through a power winding negative sequence voltage elimination control module to obtain a control winding current set value needed by eliminating of the negative sequence voltage; by controlling a winding current control module to track and control the winding current set value, the negative sequence voltage component can be eliminated; and by detecting the phase difference between power winding voltage positive and negative sequence components, an accurate phase of the negative sequence voltage can be obtained through calculation. By fixing the negative sequence voltage vector in the d axis of a negative sequence synchronous rotary coordinate system, the control structure can be simplified; and by eliminating the negative sequence voltage component in the power generation system in the imbalance load condition, the loss of the power generation system can be lowered and efficiency can be improved, and meanwhile, the power generation quality can be improved, and damage to the power utilization equipment can be avoided.

Description

technical field [0001] The invention belongs to the technical field of brushless doubly-fed generator control, and more specifically relates to a negative-sequence voltage suppression system of an independent brushless doubly-fed generator under unbalanced load. Background technique [0002] The brushless doubly-fed generator is a new type of AC induction generator. It consists of two sets of stator windings with different numbers of pole pairs. These two sets of stator windings are called power windings and control windings according to the amount of energy transferred. The rotor can be coupled with both sets of windings of the stator at the same time. The brushless doubly-fed induction generator is in the state of independent power generation for a long time when it is applied in occasions such as ship shaft power generation. In an independent power generation system, it is necessary to control the amplitude and frequency of the output voltage. In practical application...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides an independent brushless doubly-fed generator negative-sequence voltage suppression system under unbalanced load, thus solving the problem of voltage imbalance in the prior art, which causes additional losses and technical issues affecting the performance of three-phase loads in power generation systems

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