Mixed excitation type bearingless generator direct prediction controller based on magnetic flux linkage observation

Abstract

The invention discloses a mixed excitation type bearingless generator direct prediction controller based on magnetic flux linkage observation. The mixed excitation type bearingless generator direct prediction controller is constituted by winding magnetic flux linkage observers, winding magnetic flux linkage predictors, a matrix converter, a torque estimation module, a suspension force estimation module, an omega-psi 1* magnetic flux generator, a torque, a suspension force and excitation voltage reference value generator, a SVPWM, a fuzzy PID controller, a voltage regulator, and a PI controller. By using initially observed values such as the torque, the magnetic flux linkage, and the suspension force, a voltage vector required to be compensated in the next period is calculated, and the SVPWM is used to synthesize the voltage vector, and therefore a problem of a conventional direct torque and suspension force control strategy of the large fluctuation of the magnetic flux linkage, the torque, and the suspension force caused by the target voltage vector only used for the system in the next period because of the time delay of the sampling and the calculation is solved, and the fluctuation of the torque, the magnetic flux linkage, and the suspension force caused by the time delay is reduced and controlled, and the system suspension performance and the generating quality of the generator are improved.

Description

technical field [0001] The invention belongs to the technical field of electric drive control equipment, and relates to a hybrid excitation bearingless permanent magnet generator, especially the controller structure of the bearingless permanent magnet generator, which is suitable for wind power generators, gas turbine generators, aviation power supplies, hybrid Power vehicles, flywheel energy storage systems and many other occasions. Background technique [0002] The hybrid excitation bearingless permanent magnet generator inherits many advantages of the traditional permanent magnet synchronous generator, such as simple structure, high efficiency, high power density, flexible topological structure, and reliable operation. At the same time, the bearingless design makes the generator frictionless , No wear, weakening bearing failure, prolonging the service life of generator bearings and reducing maintenance costs. For example, the Chinese patent application number is CN201610...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent application number is CN201610140641.6, and the generator structure disclosed in the literature titled "A Bearingless Permanent Magnet Synchronous Generator" has three sets of windings: a power generation winding, a suspension force winding and an excitation winding. Supporting the rotor of a bearingless generator, the problems of this generator structure are: it is difficult to precisely control the eccentric displacement of the rotor, and it is difficult to obtain a stable power generation voltage while achieving stable suspension of the generator

[0003] At present, there are mainly two control methods for generator stable suspension: vector control method and direct torque and suspension force control method, but both have obvious deficiencies: the system of vector control method depends too much on motor parameters and requires complex Coordinate transformation, which increases the complexity of the control system software and hardware, and also consumes too many system clock cycles

However, such installation will bring defects such as complicated assembly process, increased maintenance cost, increased burden on the rotor, and reduced power density.

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