Three-level medium voltage converter for megawatt wind power generation

Abstract

The invention discloses one megawatt wind motor three level transducer, which comprises three phase inductance, capacitor, motor three-level transducer, direct current filter capacitor, network side three-level alternating and parallel inductance and capacitor, wherein, the motor side three level transducer is connected to three level transducer through direct mother line; the wind motor connects three phase capacitor to one end of inductance with other end connected to the transducer; the direct current output end is connected to three level transducer direct mother line through filter capacitor.

Description

(1) Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind power generation converter. (2) Background technology [0002] As a clean, pollution-free renewable energy, wind energy has attracted more and more people's attention, and wind power will become one of the most developed new energy sources in the 21st century. At present, the single-unit capacity of wind turbines continues to increase, and variable-speed constant-frequency and variable-pitch wind turbines gradually occupy a dominant position. The gearbox is a component with a high overload and premature failure rate in the current MW-level wind turbines. Since the end of the last century, wind turbine manufacturers headed by Enercon in Germany have introduced a series of direct-drive wind power generation systems without gearboxes. . This unit adopts the way of direct coupling connection between multi-stage wind generator and impeller for driving, which...

AI Technical Summary

Problems solved by technology

[0006] Rockwell's PowerFlex 7000 is a current source converter using SGCT (such as Figure 4 As shown), it belongs to the medium voltage converter, but its performance at low speed and near zero speed needs to be improved, and the cost of using SGCT as a switching device is also very high

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