Two-stage matrix converter based starting/generating system and control method thereof

Abstract

The invention discloses a two-stage matrix converter based starting/generating system and a control method thereof. In the system, a starter/generator is disposed on a unidirectional switch side of a converter, and a starting power source and a load are disposed on a bidirectional switch side. On hardware, only a switch needs to be arranged between the starting power source and the load to achieve switching from a starting state to a generating state; during state switching, control algorithms need not to be changed too much; the whole starting/generating system has the advantages of compact structure, efficiency and reliability, achieves starting/generating integrated operation easily, and is suitable for aviation starting/generating systems.

Description

technical field [0001] The invention relates to a novel starting / generating system based on a double-stage matrix converter and a control method thereof, belonging to the field of matrix converters and starting / generating systems. Background technique [0002] For a long time, the starting of engines in many occasions such as aircraft and vehicles requires the use of special electric starters (such as brushed DC motors) or non-electric starters (such as air turbine starters and gas turbine starters). The starter / generator technology makes the generator connected to the engine dual-purpose. When the engine is started, it works as a starter, drives the engine rotor to rotate to a certain speed, and then injects fuel to ignite, so that the engine enters a self-working state. After that, the engine drives the motor in turn, making it a generator to supply power to electrical equipment. The starter / power generation integrated technology unifies the generator and starter, elimina...

AI Technical Summary

Problems solved by technology

[0003] The four-quadrant AC-AC power converter is a key component of the AC starter/generator system. The traditional dual-PWM converter requires a larger DC bus energy storage capacitor and a heavier filter inductor, and cannot be integrated into the starter/generator. Internal, not conducive to the improvement of system performance

The first structure is aimed at the brushless DC motor, which places the motor on the bidirectional switch side of the two-stage matrix converter, and the starting power supply and load on the unidirectional switch side, such as figure 1 As shown in (a), this system is the first to combine the two-stage matrix converter and the brushless DC motor in the starting/generating system, which is especially suitable for high-speed applications, but is limited by the inherent characteristics of the two-stage matrix converter. characteristics, this structure will cause an overcurrent fault in the starting state, resulting in failure to start; the se

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