Controller and control method for aviation low-voltage direct-current high-power starter generator

Abstract

The invention discloses a controller and a control method for an aviation low-voltage direct-current high-power starter generator. The controller comprises a three-phase full bridge, an H bridge, a transformer, an MOS tube full bridge, a direct-current bus Vz, a direct-current bus Vo, a control circuit, a power generation auxiliary power supply and an auxiliary power supply. During starting control, energy is output to a starter generator through a starting power supply Vs, a direct current bus Vo, an MOS tube full bridge, a transformer, an H bridge and a three-phase full bridge; during power generation control, energy is output to a direct current bus Vo through a starter generator, a three-phase full bridge, an H bridge, a transformer and an MOS tube full bridge. The defects that the current of the starter generator is relatively large, the motor and the controller are difficult to realize and the power density of the motor and the controller is relatively low when the power output of the generator is 28V and above 1kW are overcome, and the generator is suitable for an LVDC aviation power supply system with 28V output and above 4kW power, and can be applied to aviation unmanned aerial vehicles. And the application requirement of changing a brush direct-current starter generator into a brushless starter generator is met.

Description

technical field [0001] The invention belongs to the technical field of generator control, and in particular relates to a controller and a control method for an aviation low-voltage DC high-power starter generator. Background technique [0002] In the field of aviation, 28V low-voltage direct current (LVDC) power supply system generally has a capacity requirement below 12kW. The power supply system is developing from a simple function of power generation and voltage stabilization to a function compatible with starting the engine. When starting, the controller drives the starter generator to work, drags the engine from static to the starting speed, and assists for a certain period of time; when the engine is self-sustained and the speed rises to the working speed of power generation, the engine drives the starter generator to work, and the generator The output AC with variable voltage and frequency is converted into regulated DC by the controller. During the power generation...

AI Technical Summary

Problems solved by technology

[0008] For option 1), when the output power of 28V is greater than 1kW, the current of the starter generator is relatively large, and it is difficult to realize the motor and the controller, and the power density of the motor and the controller are both low

[0009] For scheme 2), the starting process is carried out on the ground, and it does not have the ability to start in the air. At the same time, the AC / DC of the generator controller does not have the function of voltage stabilization. For the DC / DC stage of the generator controller, when the first-level topology is used , the power tube and transformer need to take into account the high voltage at high speed and the high current at low speed at the same time, making it difficult to implement a DC / DC converter with low efficiency and large size

When the isolated DC / DC stage of the power supply uses a two-stage topology, the circuit complexity is high

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