Multi-phase direct-drive permanent-magnet wind power generation variable current integrated system and control method thereof

Abstract

The invention discloses a multi-phase direct-drive permanent-magnet wind power generation variable current integrated system and a control method thereof. The system comprises a multi-phase direct-drive permanent-magnet wind power generator and a modular multilevel inverter, wherein the quantity of three-phase windings of the multi-phase direct-drive permanent-magnet wind power generator is 6n (n is equal to 1, 2, 3 and so on), the modular multilevel inverter comprises six three-phase bridge arms, each bridge arm comprises n sub-modules and a filter inductor, each sub-module comprises a PWM (Pulse Width Modulation) rectifier, two IGBTs (Insulated Gate Bipolar Transistors) and a capacitor, the two IGBTs are connected in series and then are connected in parallel with the capacitor and a DC side of the PWM rectifier, and an AC side of the PWM rectifier is connected with one of the three-phase windings of the multi-phase direct-drive permanent-magnet wind power generator. In the wind power generation system, modular series-parallel connection is performed on three-phase branches, each three-phase winding of the wind power generator is controlled, thus, maximum wind energy capturing and high-voltage direct grid connection of a multi-phase permanent-magnet synchronous motor can be achieved, and a grid-connection transformer is omitted.

Description

technical field [0001] The patent of the present invention belongs to the technical field of wind power generation, and in particular relates to a multi-phase direct-drive permanent magnet wind power generation converter integrated system and a control method thereof. Background technique [0002] Energy is the material basis for human survival and development, and plays a key role in social development. However, with the development of society and economy, on the one hand, people's demand for energy is increasing day by day. Environmental pollution caused by energy consumption is a huge challenge. Wind energy is a clean and pollution-free natural energy. Wind power technology is being widely promoted and applied. [0003] At present, the acquisition of electric energy mainly comes from the conversion of primary energy. The release of primary energy causes the prime mover to drive the generator to rotate, thereby generating alternating current, and the electric energy is tra...

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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a multi-phase direct-drive permanent magnet wind power conversion integrated system and its control method for the deficiencies of the prior art, which can maximize the multi-phase direct-drive permanent magnet wind power generator. Power output does not require transformers to be directly connected to the grid, effectively solving the problem of low-voltage wind turbines being connected to the grid with high voltage and high power

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