AC-AC frequency-conversion wind power generating system for semi-direct driving sub-intermediate speed cage type rotor

Abstract

The invention relates to an AC-AC frequency-conversion wind power generating system for a semi-direct driving sub-intermediate speed cage type rotor, comprising n subsystems which have same structures and comprise cage type rotor asynchronous generator units, three-phase AC-AC current transformers, Y edge-extending connecting boosting transformers, adjustable self-excitation capacitor banks and uniform time standard unit controllers, wherein the cage type rotor asynchronous generator units are respectively connected with the three-phase AC-AC current transformers and the adjustable self-excitation capacitor banks; the three-phase AC-AC current transformers are connected with the Y edge-extending connecting boosting transformers; the output ends of the uniform time standard unit controllers are respectively connected with the three-phase AC-AC current transformers and the input ends of the adjustable self-excitation capacitor banks; and n uniform time standard unit controllers are mutually connected through an uniform time standard optical-fiber network, wherein n is a natural number. The invention reduces the fault rate and has low cost, simple structure, reduced wind power cost and enhanced stability and machine set utility ratio.

Description

technical field [0001] The invention relates to a semi-direct drive sub-medium-speed cage-type rotor AC-AC frequency conversion wind power generation system, which includes a sub-medium-speed cage-type multi-pole asynchronous motor, a single-stage planetary gear speed increaser, a power electronic converter, and a Y extension Linked step-up transformer, DSP controller with unified time reference and harmonic autonomy. Background technique [0002] The problem of "double high" wind power cost and failure rate has become increasingly prominent. The total investment of the large-scale wind turbine imported in the early stage was as high as 30 million yuan. After localization, a total investment of 1.8 billion yuan has been invested in a 200MW wind farm. Based on the average calculation of 1.5MW, the investment for a single machine is about 13 million yuan, which is basically twice that of a thermal power plant. In order to match the permanent magnet machine with the low-speed...

AI Technical Summary

Problems solved by technology

Although the excitation power of the doubly-fed machine is small, its unique speed regulation instability at the over-synchronization point brings additional impact to the gearbox

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