Converter, control method thereof and wind power generation system

Abstract

The invention discloses a converter, a control method thereof and a wind power generation system. The converter comprises an electrical light conversion module, an electrical light conversion controller connected with the electrical light conversion module, a photoelectric conversion module and a photoelectric conversion controller connected with the photoelectric conversion module, wherein one end of the electrical light conversion module is in circuit connection with a wind power generation unit, the other end of the electrical light conversion module is in light path connection with the photoelectric conversion module, the other end of the photoelectric conversion module is connected with the electrical power network, the electrical light conversion controller is connected with the wind power generation unit, the photoelectric conversion controller is connected with the electrical power network, the electrical light conversion module is controlled by the electrical light conversion controller to adjust side energy of the wind power generation unit, and the photoelectric conversion module is controlled through the photoelectric conversion controller to adjust the side energy of the electrical power network. According to the converter, through electrical light conversion and photoelectric conversion, electrical decoupling at wind power generation sides and electrical power network sides can be realized, harmonic waves are reduced, and low and high voltage ride through capabilities of the wind power generation unit can be improved.

Description

technical field [0001] The invention relates to a wind power generating set, in particular to a converter, its control method and a wind power generating system. Background technique [0002] A wind turbine is an electrical device that converts wind energy into mechanical energy, which drives the rotor to rotate, and finally outputs alternating current. The devices required for wind power generation are called wind turbines, including wind turbines and generators. The transmission lines of the wind turbines are connected to the grid through which the electrical energy is transmitted. The integration of wind turbines into the grid needs to meet three conditions: the frequency, voltage, and phase of the wind turbine must be consistent with the frequency, voltage, and phase of the grid. Due to the randomness of wind energy, the frequency and voltage of the electric energy generated by wind turbines are unstable. Therefore, in order to provide stable and high-quality electric ...

AI Technical Summary

Problems solved by technology

For direct-drive wind turbines, when the grid voltage drops, it will cause the DC voltage in the converter to rise, and its output power contains harmonics, which will affect the grid

Therefore, the low voltage ride-through capability of existing power converters is limited, and the output power contains harmonics

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