A permanent magnet direct drive wind power generation system and control method

Abstract

The present invention discloses a permanent magnet direct drive wind power generation system and a control method thereof. A permanent magnet synchronous generator converts the wind power of a wind turbine into the electric power, and the output end of the permanent magnet synchronous generator is respectively connected with the input ends of a converter and a rectifier; the output ends of the converter and the rectifier are respectively connected with the input end of a three-phase inverter, and the output end of the three-phase inverter is connected with the AC grid; the speed sampling output end of the permanent magnet synchronous generator is connected with the input end of a controller, the output end of the controller is connected with the driving signal input end of the rectifier, and the controller controls the product of a speed adjustment signal and a standard sinusoidal signal containing motor rotor position information as a current loop reference signal of the rectifier; and the output end of the controller is connected with the drive signal input end of the converter, and the controller is configured to control the speed adjustment signal as a reference signal of the q-axis current component on the converter and control a reference signal of a d-axis current component on the converter to be zero. According to the technical scheme of the present invention, the current waveform quality and power factor on the line can be improved, the distortion rate can be reduced, and the reactive output can be adjusted.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a permanent magnet direct drive wind power generation system and a control method. Background technique [0002] The direct-drive PMSG-based wind power conversion device is very suitable for large-scale wind power plants and has become one of the research hotspots in the field of electric power today. It has been recognized by engineers and designers because it has no gear box and greatly reduces mechanical power loss. [0003] With the development of the current power grid and the increase of user demand for electricity, the rapid development of new energy power generation technology has led to the increasing proportion of wind power generation in today's electricity market and the capacity of the unit. The steady increase in the power of wind turbines makes the power switching devices in the converter device bear higher instantaneous voltage and current stress, and the swit...

AI Technical Summary

Problems solved by technology

The steady increase in the power of wind turbines makes the power switching devices in the converter device bear higher instantaneous voltage and current stress, and the switching loss is also gradually increasing, and the converter system on a single circuit is also difficult to meet the increase. Therefore, it is a challenge to study new converter topologies such as multiple rectifiers connected in parallel, to arrange the devices in the wind power converter system rationally, and to formulate a sound control strategy and monitoring mechanism.

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