A hybrid excitation doubly-fed wind power generator and power generation system

Abstract

The invention discloses a hybrid excitation doubly-fed wind power generator and a power generation system. The hybrid excitation doubly-fed wind power generator comprises a stator, an outer winding rotor, an inner claw pole permanent magnet rotor and a rotating shaft. The stator and the inner claw pole The permanent magnet rotors are respectively arranged on the outer circumference and the inner circumference of the outer wound rotor; the inner claw pole permanent magnet rotor is coaxial with the outer wound rotor and can rotate freely; the stator and the outer wound rotor are respectively arranged Stator windings and rotor windings, the inner claw pole permanent magnet rotor is installed on the shaft and can rotate freely, the claws of the claw pole rotor are installed with permanent magnets and welded magnetic isolation materials at intervals; the excitation bracket is fixed on the end of the casing on both sides On the inner side of the cover, the field winding is installed on the field bracket and adopts a brushless structure. The ring-shaped permanent magnet is installed inside the claw pole, and the permanent magnet flux generated by the permanent magnet and the flux generated by the field winding pass through the inner air gap and the outer air gap to link the stator winding and the outer wound rotor winding respectively.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a hybrid excitation doubly-fed wind power generator and a power generation system. Background technique [0002] Wind energy is a clean and renewable energy with broad development prospects, and wind power generation technology has attracted more and more attention from all over the world. Wind turbines are the core of the entire power generation system. There are mainly two types of wind power generators currently in use, one is an ordinary permanent magnet synchronous generator, and the other is a variable-speed constant-frequency double-fed induction generator. The variable speed constant frequency double-fed wind turbine stator is directly connected to the grid, the generator rotor and the wind wheel are coaxially connected, the rotor winding adopts a winding structure, and the rotor winding is connected to the grid through a converter that can flow bidirection...

AI Technical Summary

Problems solved by technology

At present, there have been many researches at home and abroad on the countermeasures for the low voltage ride-through capability of the doubly-fed variable-speed constant-frequency wind power system when the power grid fails, including improving the dynamic characteristics of the system by improving the converter control strategy so that it has a certain low-voltage Ride-through capability, but many control methods are relatively complex, especially when the voltage drop depth is large, the effect of only relying on the control strategy is limited, so it is necessary to change the structure of the generator body or increase the hardware protection circuit to realize the low-voltage ride-through of the wind turbine And effectively protect the converter

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