Harmonic generator and method for detecting grid components through it

Abstract

A harmonic generator and a method for detecting grid components through the harmonic generator, the harmonic generator includes a three-phase inverter unit and a calculation control unit, the three-phase inverter unit includes a step-up transformer, a rectifier circuit, an inverter connected in sequence Transformation circuit and sampling circuit, the sampling circuit includes a current sampling circuit and a voltage sampling circuit, the calculation control unit includes a CPU and a display screen connected to it, the sampling circuit is connected to the CPU, and the CPU drives the IGBT in the inverter circuit on and off through the drive circuit The method includes: first input the harmonic size and frequency through the display screen to the CPU to make the command current, and then generate the SPWM signal to the IGBT through the carrier phase shift and current tracking, and the CPU reversely calculates the sampled voltage signal at the same time. The terminal voltage of the product under test can be used to calculate the loss and reactance value of the product under test under the corresponding harmonic.

Description

Harmonic generator and method for detecting grid components through it technical field The invention relates to the technical field of harmonic generators, in particular to a three-phase large-capacity harmonic generator and a method for detecting grid components through it. Background technique With the rapid development of power electronic technology, various power electronic devices have been applied to every corner of the automation industry, which are closely related to our lives. Although they have enriched our lives, they have also brought negative impacts. Too many power electronic devices make the harmonic content in the power grid more and more, which seriously reduces the quality of the power grid. At the same time, the harmonics will in turn affect the power equipment, making the power equipment heat, vibrate and generate noise, making the power electronic devices Breakdown will age the insulation, reduce the service life of the equipment, and even cause more s...

AI Technical Summary

Problems solved by technology

In addition, since the reactor and other power grid components cannot accurately obtain their reactance and loss values ​​under harmonics during the production process, it is necessary to develop a harmonic generator device

The traditional harmonic generator uses an analog signal source to generate a signal, and the signal is amplified by the amplifier. This method is cumbersome to operate and has a complicated structure. Even if the signal is amplified by the amplifier, the power is still relatively small, and it is difficult to meet the needs of high-power detection.

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