Doubly-fed wind turbine generator converter and black-start method implemented by using same

Abstract

The invention discloses a doubly-fed wind turbine generator converter and a black-start method implemented by using the same. The doubly-fed wind turbine generator converter comprises a converter controller, a direct-current bus, a support capacitor, a Chopper circuit, a machine-side converter, a grid-side converter and a standby power supply system. The direct-current bus is connected between themachine-side converter and the grid-side converter; the support capacitor, the Chopper circuit and the standby power supply system are sequentially connected to the direct-current bus; the machine-side converter, the standby power supply system and the grid-side converter are respectively connected with the converter controller, the converter controller is respectively in communication connectionwith a main control system and a grid-connected circuit breaker, and the converter controller monitors a converter-side alternating-current signal, a converter-side alternating-current signal and a direct-current bus voltage. The standby power supply system capable of being used as a black-start power supply is integrated in the converter, electric energy and auxiliary power supply system power supply required for establishing excitation voltage for a generator rotor are provided, and the problems that existing black-start equipment is high in price, complex in structure and low in utilization efficiency are solved.

Description

Technical field [0001] The invention relates to the technical field of wind power generation, in particular to a double-fed wind turbine converter and a black start method realized by using the converter. Background technique [0002] In recent years, as the penetration rate of wind farms in the power grid has gradually increased, the technical requirements for wind farms to be connected to the power system have also increased. Because wind farms are mostly installed in remote areas, the grid structure of the power grid where the wind farm is located is relatively weak. In order to enhance the reliability of the grid operation, the black start technology of wind turbines has become a topic worthy of research. [0003] For the black start technology of wind turbines, there are currently two main technical routes. One is to configure a black start power supply on the collection line of the wind farm, and transmit power to the wind turbine auxiliary power system and The excitation ci...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and propose a doubly-fed wind turbine converter and a black start method realized by using it. A backup power supply system is installed on the DC bus of the converter. Control the machine-side converter and grid-side converter to provide the electric energy and auxiliary power system power required for the generator rotor to establish the excitation voltage, and support the wind turbine to complete the black start process, thereby solving the problem of expensive and complex structure of the existing black start equipment and use inefficiencies

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