Full-power wind power converter used for electrically excited synchronous generator

Abstract

The invention discloses a full-power wind power converter used for an electrically excited synchronous generator and belongs to the technical field of wind power generation. The full-power wind power converter comprises a motor side converter, a network side converter and two DC (direct current) side filtering capacitors C1 and C2, wherein the AC (alternating current) input end of the motor side converter is electrically connected with the electrically excited synchronous generator, the DC output end of the motor side converter is electrically connected with the DC bus side of the network side converter through the DC side filtering capacitors, and the AC side of the network side converter is connected with an electric network; the full-power wind power converter also comprises a DC chopper circuit which is connected with the DC bus of the network side converter in parallel; and the motor side converter is a two-quadrant three-level Vienna rectifier, the network side converter is a voltage-type three-level converter which is composed of a power device adopting controllable switches and is of a diode middle point clamping-type topological structure, and the DC side filtering capacitors C1 and C2 are connected in series and then connected with the DC side of the motor side converter in parallel. The full-power wind power converter provided by the invention has the beneficial effects that the distortion factor of the output voltage is effectively reduced, the loss is reduced, the output wave shape quality is good, the cost is saved, the maintenance is convenient.

Description

technical field [0001] The invention relates to a full-power wind power converter for an electric excitation synchronous generator, belonging to the technical field of wind power generation. Background technique [0002] As global energy problems become more and more prominent today, wind energy, as a renewable, non-polluting energy with huge reserves, has been highly valued by human beings. Governments of various countries have even regarded this wind power generation, which is the most competitive with thermal power generation, as a way to promote power generation. An important way to diversify the structure and improve the environment and ecology. At present, wind turbines can be roughly divided into doubly-fed wind turbines and full-power wind turbines. Full-power wind turbines are an important form of converting wind energy into electrical energy. It is very popular and has become a good solution for wind power generation. [0003] The full-power wind turbine converts...

AI Technical Summary

Problems solved by technology

Electric excitation synchronous generators can provide high-efficiency and high-quality electric energy conversion, facilitate reactive power regulation, and improve system stability. However, for this new type of unit scheme, the research on the required full-power converter is still at the beginning of scientific research in China stage, no corresponding product

[0004] In addition, most of the current mainstream wind turbines are 660V or 690V low-voltage systems. For high-power grid-connected converters, due to the limitation of the current level of power devices, parallel connection of converters or parallel connection of power devices is generally used to improve the efficiency of the converter. The capacity of the converter makes the design and control of the full power converter of the wind turbine complex

At the same time, the single-unit capacity of mainstream wind turbines at home and abroad has already exceeded 2MW, and the existing 5MW full-power converters mostly use back-to-back dual three-level four-quadrant operation converter solutions, but the back-to-back dual three-level structure Converter, for a full-power wind power generation system that does not require energy to flow in both directions, is a waste of resources

With the increase of wind turbine unit capacity and the reduction of wind turbine cost, new challenges will inevitably be posed to full power converters, and the existing technical solutions of full power converters can no longer meet the new requirements

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