Paratactic structure hybrid excitation synchronous machine (HESM) and alternating current excitation control system thereof

Abstract

The invention discloses a paratactic structure hybrid excitation synchronous machine (HESM) and an alternating current excitation control system thereof, belonging to the technical field of synchronous machine alternating current generation. The permanent magnet part and the electromagnetic part of the HESM are arranged in the same closure in parallel along the axial direction, the stator cores of the permanent part and the electromagnetic part are mutually independent, jointly share one stator armature winding and have the same number of tooth sockets, permanent magnet induced electromotive force and electromagnetic induced electromotive force are superposed in the armature winding, and the purpose of improving the induced electromotive force waveform can be achieved by designing the armature winding distribution mode, the excitation winding distribution mode and the permanent magnet rotor pole shape as well as controlling the exciting current. The magnitude and phase of the electromagnetic induced electromotive force in the armature winding can be adjusted by vector control to enable the alternating current exciting current to only have a direct axis component, thus adjusting the magnitude of the total output voltage of a machine, stabilizing the output voltage of the machine, and realizing constant voltage output in a wide revolving speed range and a large load range.

Description

technical field [0001] The invention belongs to the technical field of synchronous motor AC power generation. It particularly relates to a parallel structure hybrid excitation synchronous generator and its AC excitation control system. Background technique [0002] The permanent magnet synchronous motor has the advantages of high reliability, high efficiency and small size, and has many advantages over the traditional electric excitation synchronous motor. However, since the rotor of the permanent magnet motor is excited by permanent magnet steel, it is difficult to adjust the air gap magnetic field. It operates as a generator. When the temperature rises, the permanent magnet steel produces reversible demagnetization, which reduces the output voltage of the generator. In addition, when the generator When the load changes, especially when the inductive load increases, the output voltage decreases further. Usually the voltage change rate of the permanent magnet generator is ...

AI Technical Summary

Problems solved by technology

The first type of scheme is similar to the traditional electric excitation generator, the DC excitation current is introduced into the excitation winding on the rotor through brushes and slip rings, and the electric excitation field is rotated by the rotation of the rotor, such as the invention patent No. ZL.200310106347.6 Hybrid excitation synchronous motor, this scheme reduces the reliability and environmental adaptability of the motor due to the existence of brushes and slip rings

[0004] The second type of scheme is a hybrid excitation motor with a double salient pole structure. The DC current flowing through the excitation winding on the motor stator generates a magnetomotive force with a fixed position. The change of the magnetic circuit reluctance when the rotor rotates makes the stator flux change, so that the alternating electromotive force is induced in the armature winding, such as the double salient pole hybrid excitation synchronous motor with the invention patent number ZL. ideal

[0007] It can be seen from the above that the electric excitation part of the hybrid excitation motor adopts DC current excitation. Although the excitation control is relatively simple and the technology is relatively mature, the existence of the hybrid excitation synchronous motor or brushes and slip rings makes the motor low in reliability and environmental adaptability. Poor, or the double salient pole motor makes the output voltage sinusoidal is not good, or the claw pole electric excitation makes the structure complicated, and needs to consume more electric excitation magnetomotive force, which reduces the electric excitation efficiency

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