Frequency conversion alternating current generation system control method with voltage harmonic suppression function

Abstract

The invention discloses a frequency conversion alternating current generation system control method with a voltage harmonic suppression function. A generator of a generation system is a stator duplex winding asynchronous generator and provided with two sets of stator windings, one set of stator winding is a control winding and connected with a power converter, and the other set of stator winding is a power winding and outputs three-phase frequency conversion alternating current. Frequency of output voltage of the power converter is controlled according to active load information and the error of direct current bus voltage of the power converter, the amplitude of the output voltage of the power converter is controlled according to the error of fundamental components and the error of harmonic components of the output voltage, therefore, slip frequency of the generator can be changed, the amplitude and the harmonic content of a air-gap field can be adjusted, and the frequency conversion alternating voltage output by the generation system can be stable and sinusoidal. The control method is simple in structure, strong in load adaptability, adaptive to both linear load and nonlinear load, and suitable for being used in fields with high requirements on power supply quality of an independent power supply system, such as airplanes and ships and warships, and the output voltage is good in static and dynamic performance.

Description

technical field [0001] The invention relates to a control method of a variable frequency alternating current generation system, in particular to a control method of a variable frequency alternating current generation system with voltage harmonic suppression function. Background technique [0002] As one of the most typical independent power systems, the aircraft power system has experienced several stages of development, including low-voltage direct current, constant-speed constant-frequency alternating current, variable-speed constant-frequency alternating current, high-voltage direct current, and variable-frequency alternating current. Judging from the development and research of aircraft power supplies at home and abroad, high-voltage direct current and variable frequency alternating current are the development trends of aircraft power supply systems. Due to the different functions and uses of aircraft, the required power supply capacity is also different, which makes the...

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Problems solved by technology

In the process of researching the DWIG variable frequency AC power system applied to aircraft, the inventor found that when the variable frequency AC power that only accounts for a small part of the total power supply capacity is rectified and inverted into 400Hz constant frequency AC power, since the rectifier is a nonlinear component, when When the power winding of DWIG is connected to a rectifying load, a large number of harmonics will be introduced into the power winding current, resulting in distortion of the output three-phase variable frequency AC voltage, which will endanger the normal operation of various important instruments in the aircraft, and even affect the flight safety of the aircraft. Therefore, measures must be taken to suppress the harmonics in the three-phase variable frequency AC voltage

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