Three-phase 400Hz medium-frequency static power supply device and control method thereof

Abstract

The invention discloses a three-phase 400Hz intermediate-frequency static power supply device and a control method thereof. The intermediate-frequency static power supply device is realized through athree-phase inverter circuit, a Hall element is used as a sampling part, and a closed-loop control loop is formed through a digital logic main controller. In the process that the main controller calculates the duty ratio of an SPWM wave through the error between a target voltage and a current voltage, a relation term of an integral coefficient is added to a mathematical model of a proportionalitycoefficient of voltage regulation, so that the static error between the output voltage of the power supply device and the target voltage is effectively eliminated. The influence of load disturbance iseffectively restrained through the rapid and timely anti-interference performance of the current signals, and a rapid, accurate and flexible control effect is achieved. Compared with an existing device, the device has the advantages of being stable in starting, stable in operation, high in control precision and small in size, and being convenient to debug and maintain.

Description

technical field [0001] The invention belongs to the technical field of power supply, and in particular relates to a three-phase 400Hz intermediate frequency static power supply device and a control method thereof. Background technique [0002] Most of the early intermediate frequency power supplies were generated by motor units, usually composed of asynchronous motors and synchronous generators. The asynchronous motor is powered by the three-phase power frequency alternating current generated by the fuel generator set, and the asynchronous motor drives the synchronous generator to rotate to generate the intermediate frequency alternating current of the required amplitude and frequency. This kind of power supply is not only bulky, but also has poor stability of output voltage and frequency. Since the power supply is composed of a rotating motor, its mechanical and electromagnetic noise is very obvious and its reliability is low. [0003] Later, with the emergence of high-pow...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, a three-phase 400Hz intermediate frequency static power supply device and its control method provided by the present invention solve the problems of large volume, poor stability of output voltage and frequency of traditional asynchronous motors in the three-phase 400Hz alternating current implementation scheme, Obvious mechanical and electromagnetic noise and low reliability; the existing static intermediate frequency power supply control system and control method are complicated, low in flexibility and poor in reliability

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