Compound full-power wind power converter

Abstract

The invention discloses a compound full-power wind power converter, belonging to the technical field of wind power generation and comprising a machine-side converter, a grid-side converter and a direct-current-side filter capacitor, wherein the machine-side converter is formed by a two-quadrant three-level Vienna rectifier; the grid-side converter is formed by a voltage-type diode neutral point clamped type three-level converter adopting a power device with a controllable switch; the alternating-current input end of the Vienna rectifier is connected with a wind power generator, and the direct-current output end of the Vienna rectifier is connected with the direct-current bus side of the voltage-type diode neutral point clamped type three-level converter by the direct-current-side filter capacitor; and the alternating-current side of the voltage-type diode neutral point clamped type three-level converter is connected with a power grid. The compound full-power wind power converter has the beneficial effects that the system structure is optimized, the cost is reduced, the system maintenance is convenient, the system reliability is improved, variable-speed constant-frequency controls of an electrically excited synchronous generator, a permanent magnet synchronous generator and a rat-cage type asynchronous generator are effectively realized, high-quality electric energy is provided, and the reliability and the stability of a power grid system are improved.

Description

technical field [0001] The invention relates to a wind power converter, in particular to a composite full-power wind power converter, which belongs to the technical field of full-power wind power generation systems. 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. [0003] At present, wind turbines can be roughly divided into double-fed and full-power. Full-power wind power system is an important form of converting wind energy into electrical energy. Its simplicity, high efficiency, and easy realization of low-voltage ride-through are favored in the wind power fie...

AI Technical Summary

Problems solved by technology

[0004] 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. capacity, which complicates the design and control of full power converters for wind turbines

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 The 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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