Great-power wind-power integration convertor suitable for cage asynchronous generator

Abstract

The invention relates to a great-power wind-power integration convertor suitable for a cage asynchronous generator, belonging to the technical field of new energy of wind and power. The invention adopts the technical scheme that a rectifying unit comprises at least one three-phase uncontrolled diode rectifier unit or a plurality of three-phase uncontrolled diode rectifier units connected in parallel, a boost chopper unit comprises at least one boost chopper unit or a plurality of boost chopper units connected in parallel, an inverter unit comprises at least one three-phase full-control inverter unit or a plurality of three-phase full-control inverter units connected in parallel, and a motor soft-start excitation unit comprises at least one three-phase soft-start excitation unit or a plurality of three-phase soft-start excitation units connected in parallel. By applying the low-cost cage asynchronous generator to wind-powered generation, the whole unit cost is greatly decreased, the control structure is simplified, and the stability and the suitability of the unit operation are enhanced.

Description

Technical field: [0001] The invention relates to a high-power wind power grid-connected converter suitable for a cage-type asynchronous generator, in particular to a megawatt-level high-power wind power grid-connected converter for a cage-type asynchronous generator, and belongs to the technical field of wind power new energy. Background technique: [0002] In recent years, the development of human society has entered a new period of rapid development, and the trend of global economic integration has become increasingly obvious. The three pillar industries of information, new energy and new materials have become an important cornerstone for mankind to move towards a new civilization in the 21st century, and the new energy industry plays a vital role in the rapid and sustainable development of the economy. Wind power technology is a relatively mature new energy technology with the most large-scale development conditions and commercial development prospects. It has the advanta...

AI Technical Summary

Problems solved by technology

Although, in recent years, with the continuous improvement of the performance of permanent magnet materials and the decline of prices, the price of permanent magnet synchronous motors has been greatly reduced and has gradually become accepted by the public, but due to the limitations of permanent magnet materials themselves; especially, in Under high temperature, vibration and other conditions, the magnetic properties of permanent magnets will deteriorate, and there is a danger of loss of magnetism; the difference in rare earth materials or production processes will also cause great differences in the magnetic properties of permanent magnets. Generator performance and longevity are detrimental

The problem of life is an important reason that limits its application in the field of wind power, because the current design life of wind turbines is basically 20 years, and the current use of permanent magnet motors shows that the magnetism of the magnets will decrease after a few years.

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