Three-level type starting/electricity generator two-phase excitation constant slip AC starting model and control method thereof

Abstract

The invention relates to a three-level type starting / electricity generator two-phase excitation constant slip AC starting control model and a control method thereof. According to the technical scheme, a two-phase symmetric exciting winding is used in a three-level type starting / electricity generator exciter stator, when a motor is started, two-phase alternating currents with phase mutual difference being 90 degrees are connected to the magnetizing exciter stator, the additional alternating current frequency of the magnetizing exciter stator is adjusted to keep the constant slip with the induction magnetic potential frequency of a motor rotor, so that it is guaranteed that the amplitude of three-phase alternating currents output by a magnetizing exciter is stable, and sufficient stable exciting currents are provided for starting of a main electricity generator. Accordingly, sufficient stable exciting currents are provided for starting of the main electricity generator, and it can be guaranteed that a three-level type starting / power generation machine is stably and reliably started.

Description

technical field [0001] The invention belongs to the technical field of three-stage generator / generator AC start control, and in particular relates to a control model and control method for three-stage generator / generator two-phase excitation constant-slip AC start. Background technique [0002] At present, three-stage brushless generators are widely used in the fields of aviation AC power systems, electric vehicles and wind power generation systems. This type of motor is used as a generator with mature technology, but this type of motor has no self-starting capability and requires a special starter motor to It starts, which complicates its starting. If the original three-stage brushless generator can be improved and controlled to make it work in the electric state, that is, to realize the integration of starting and power generation, the corresponding starting supporting equipment can be saved, thereby reducing the volume and weight of the system. [0003] The three-stage g...

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Problems solved by technology

[0004] In order to solve the excitation problem of the three-stage generator / generator, relevant scholars at home and abroad have proposed single-phase AC excitation and three-phase AC excitation schemes. The single-phase AC excitation is limited by the capacity of the exciter body and the amplitude of the power supply voltage. Not high, poor energy transmission between stator and rotor

For three-phase AC excitation, the structural design of the motor body needs to be greatly changed, the utilization rate of the winding is poor, and the switching method of AC and DC excitation is complicated

[0006] The excitation mode described in CN103532454A only describes the way in which the two-phase excitation winding is connected to the two-phase alternating current under the starting state of the three-stage generator / generator, and does not propose a specific control method, nor does it explain the control characteristics of the excitation current. Make it difficult to implement the two-phase AC excitation method

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