Power supply converter of high-speed permanent magnetic starter generator and control method of power supply converter

Abstract

The invention provides a power supply converter of a high-speed permanent magnetic starter generator and a control method of the power supply converter. The power supply converter comprises a currentdetection circuit, an SiC device full-control full-bridge, an SCR device phase-control full-bridge, a switching circuit, a voltage detection circuit and a control circuit. Output electrical frequencyof the generator is improved to 1-2kHz, and the weight of a starter generator system can be remarkably reduced. The applicable generator rotation speed range is quite wide. By use of a voltage increasing and decreasing power supply converter topology structure, the high voltage of armature winding voltage of the starting generator is higher than corresponding winding voltage by use of a full-control full-bridge voltage increasing topology, winding current can be effectively reduced and realizability of the motor winding is improved. Own synchronous inductance of the starter generator can be increased, there is no need to add auxiliary big inductors in the power supply converter and additional loss caused by high-frequency ripple current of a three-phase full-control full-bridge injection motor is reduced. A power device in the power supply converter is allowed to work near direct current bus voltage, and requirements on power devices imposed by working voltage and working current are quite low.

Description

technical field [0001] The invention relates to a power converter for a high-speed permanent magnet starter generator and a control method thereof. Background technique [0002] The power converter of the starter generator is a power converter used in conjunction with the starter generator. The starter generator can work in two states of motoring and power generation in time-sharing, and has a dual-purpose function. When the starter generator is working in the electric state, the power converter is used as the source power, and the energy flows from the power converter to the starter generator first, and then the starter generator converts electrical energy into mechanical energy to drive the engine; Torque control makes the engine rise from zero speed to normal self-stable working speed. When the starter generator is working in the power generation state, the engine is used as the source motor, and the energy is first converted into AC power by the starter generator, and ...

AI Technical Summary

Problems solved by technology

[0008] The power converter described in solution 1) is the most widely used on aircraft, but its main disadvantage is that the hardware structure is relatively complicated, and it is not suitable for high voltage direct current (HVDC) systems, and high voltage direct current (HVDC) is relatively variable speed constant frequency (VSCF) The system has higher system efficiency and represents the mainstream direction of future development

The power converter described in solution 2) has a simple hardware structure, high efficiency and high reliability, but its main disadvantage is that the current of the armature winding is extremely irregular, which has a large impact on the power converter, and the power quality of direct current is extremely low when generating power.

The hardware of the power converter described in scheme 3) is simple, but the shortcoming is that the three-phase full-control full-bridge topology operating frequency realized by Si devices is usually less than 20kHz, and it is usually used in industries where the switching frequency is higher than the electrical frequency of the motor by an order of magnitude or more. It is difficult to be directly applied to the aircraft starting and generating system with an electric frequency up to 1-2kHz; the input voltage range is limited; the current of the power tube is too large, and the working conditions of the power tube are harsh

Images