Fault tolerance permanent magnet power generation system and control method thereof

Abstract

The invention discloses a fault tolerance permanent magnet power generation system and a control method thereof. The fault tolerance permanent magnet power generation system comprises a winding open-circuited type permanent magnetic generator, a three-phase bridge-type converter, a three-phase rectifying bridge, parallel DC buses, a filtering capacitor, a driving circuit, a controller and a detection circuit, wherein two sides of the generator are respectively connected with the three-phase bridge-type converter and the three-phase rectifying bridge; the parallel DC buses are connected between the converter and the DC side of the rectifying bridge, and the filtering capacitor and a load are respectively connected in parallel between the parallel DC buses; the detection circuit comprises a position sensor, a current sensor and a voltage sensor, and related signals measured by all the sensors are transmitted into the controller; and output signals of the controller are connected with the driving circuit, and the driving circuit drives various switch devices in the three-phase bridge-type converter to be switched on and off according to the related control signals. The fault tolerance permanent magnet power generation system is capable of expanding the application field of permanent magnet motors. The invention further discloses the control method of the fault tolerance permanent magnet power generation system.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a winding open-circuit type permanent magnet power generation system structure and a control method thereof with a fault tolerance function. Background technique [0002] With the continuous advancement of rare earth permanent magnet material technology, the performance of permanent magnet motors continues to improve, and the advantages of high power density and high efficiency make permanent magnet motors one of the preferred motors in the field of motor drives and generator applications. The more widely used in military, aerospace, industrial automation, wind power and other fields. However, due to the existence of permanent magnets, the air-gap magnetic field inside the permanent magnet motor is difficult to control through external measures, and there are problems such as field weakening and power generation voltage regulation in the field of drive and power generatio...

AI Technical Summary

Problems solved by technology

[0004] The three-phase windings of traditional AC motors are connected in star or delta. The motor drive system of delta connection can improve the utilization rate of DC voltage. However, due to the existence of zero-sequence current path, when the motor is asymmetrical due to processing or wear , will generate zero-sequence components and harmonic components in the motor winding current, which will increase the loss of the motor, while the star connection can eliminate the third-sequence harmonic components of the current and voltage in the windings, and eliminate the zero-sequence current components caused by the asymmetry of the motor. are therefore widely used

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