Direct-current generator

Abstract

The invention relates to a direct-current generator. The direct-current generator comprises an external stator, an internal rotor, a junction disc and a rack; the external stator comprises m stator strips which are sequentially and uniformly arranged in the circumferential direction and provided with power generation electrical elements, and the multiple stator strips define a hollow cylinder and are fixed in the rack; the internal rotor comprises a rotor shaft which is coaxially and rotatably connected to the inner side of the external stator and n rotor groups which are distributed in the axial direction of the rotor shaft, each rotor group comprises (m-1) rotor strips which are sequentially and uniformly arranged in the circumferential direction of the rotor shaft and are provided with k permanent magnet pole pairs; and the junction disc outputs electric energy to the outside after being connected with m stator strips in the same polarity direction; a current sensor is arranged at the connection section of the junction disc and the stator strips; and a voltage sensor is arranged at the external output section of the junction disc. Different phase outputs are realized by setting the phase angle difference of the stator and the rotor, and the operation state of power generation equipment is controlled by detecting the voltage and the current through the sensors, so that the purposes of reducing the grid-connected cost and ensuring stable operation of a power grid are achieved.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a DC generator. Background technique [0002] There are two types of current wind power generators, one is doubly-fed generator and the other is direct-drive generator. Since the direct-drive generator can generate electricity at low wind speed, it tends to replace the doubly-fed generator. The direct drive generator uses a multi-pole rotor and stator, but follows the three-phase motor principle of the traditional generator, and outputs three-phase alternating current. This type of three-phase alternating current needs to be converted after AC-DC conversion in the direct drive wind turbine. Then DC-AC conversion can finally realize power grid connection, the cost of current grid connection is relatively high, and the power output control of the motor must be controlled according to the power curve formulated by the grid dispatching strategy. Due to the grid control ...

AI Technical Summary

Problems solved by technology

The direct drive generator uses a multi-pole rotor and stator, but follows the three-phase motor principle of the traditional generator, and outputs three-phase alternating current. This type of three-phase alternating current needs to be converted after AC-DC conversion in the direct drive wind turbine. Then DC-AC conversion can finally realize power grid connection, the cost of current grid connection is relatively high, and the power output control of the motor must be controlled according to the power curve formulated by the grid dispatching strategy. Due to the grid control strategy Complex and unpredictable wind conditions make it difficult to effectively implement control strategies

Images