DC wind power plant switched reluctance motor conversion system and control method thereof

Abstract

The invention relates to a DC wind power plant switched reluctance motor conversion system and a control method thereof, the DC wind power plant is composed of Z fans, Z switched reluctance generator systems and a lifting DC converter, each switched reluctance generator system is composed of a switched reluctance generator, a converter system and a controller, the converter system is composed of a converter main circuit and an isolation type reversible direct current conversion circuit, the Z switched reluctance generator systems output direct current and then are connected in series with direct voltage boosting, and different excitation power generation modes are adopted in the working process of the converter main circuit according to different rotating speed areas. The isolation type reversible direct-current conversion circuit can excite or charge a storage battery in a current conversion main circuit when working forwards, and can assist safe ride-through when low-voltage faults occur when working backwards, and the whole system device is high in utilization rate, high in controllability, high in cost performance and suitable for being applied to the field of wind power, especially offshore direct-current wind power.

Description

technical field [0001] The present invention relates to the field of switched reluctance motor systems, in particular to a switched reluctance motor used as a wind power generator for a DC wind farm, a converter system capable of direct voltage boosting, variable excitation voltage, continuous power generation in three-speed zones, and low voltage ride-through considerations. Converter systems and control methods for level protection, etc. Background technique [0002] Wind power is a clean power generation mode, and it is the main force in the field of clean energy power generation at present and in the future. However, in my country, the development of large-scale land wind power is approaching its peak, and many coastal provinces are not only rich in offshore wind resources, but also have relatively low wind speeds. Relatively stable, but my country's offshore wind power development is just in its infancy. At the same time, according to domestic and foreign experience, off...

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Problems solved by technology

[0005] In addition, during the operation of the switched reluctance generator itself, the problem of the excitation power supply is separate excitation or self-excitation. With their own advantages and disadvantages, how to better adapt to the converter system under wind power conditions. It greatly increases the amount of manual labor and reduces reliability, and if it is self-motivated, there is a problem of how to start; whether the inverter system can be reused, otherwise the number of hardware will be greatly increased, which will reduce reliability and increase the loss of the inverter system; etc.

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