New energy grid connection system and achieving method thereof

Abstract

The invention relates to a new energy grid connection system which comprises at least one new energy electric field, at least one voltage source converter (VSC) rectifier, a direct-current busbar, at least one VSC inverter, a resonance boosting rectifying link and a resonance voltage reduction link. The at least one new energy electric field is connected with the direct-current busbar respectively through at least one VSC; the direct-current busbar is connected with the resonance boosting rectifying link; the resonance boosting rectifying link is connected with the resonance voltage reduction link through a direct-current cable or a direct-current transmission line; and the resonance voltage reduction link is connected with the at least one VSC inverter through the direct-current busbar. The resonance boosting rectifying link and the resonance voltage reduction link are applied to the new energy grid connection system, and the resonance links are large disposable equipment, easy and convenient to design and manufacture, easy to control, and capable of reducing technological difficulty and reducing cost. The problem that high-voltage high-capacity VSC and direct current to direct current (DC / DC) links are high in manufacture cost and difficult to design in the new energy grid connection system is solved, a brand new technological path is provided for the new energy grid connection.

Description

technical field [0001] The invention relates to a system in the field of power electronics and an implementation method thereof, in particular to a new energy grid-connected system and an implementation method thereof. Background technique [0002] In today's energy shortage and environmental deterioration, vigorously developing new energy is the current key development direction of our country. The grid connection of new energy is currently mainly the application of flexible DC transmission technology. Due to the constraints of the natural environment, the choice of new energy electric fields is often Far away from places where electric loads are concentrated, long-distance transmission of electric energy is required. [0003] A typical system of current grid-connected new energy is shown in the attached figure 1 , attached figure 2 shown. The operating principle of the first method is: the new energy electric field is connected to the AC busbar through a bidirectional ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a new energy grid-connected system and its implementation method. The present invention applies the resonant boost and resonant step-down links to the new energy grid-connected system. The resonant link is a large-scale primary device, and the design It is easy to manufacture and easy to control, which can not only reduce technical difficulty, but also reduce costs; it solves the problems of high cost and difficult design of high-voltage and large-capacity VSC and DC / DC links in current new energy grid-connected systems, and provides new energy grid-connected Provide a new technical route

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