Three-single-phase-three-wire-system parallel APF/SVG device

Abstract

The invention provides a three-single-phase-three-wire-system parallel APF / SVG device which comprises a controller. The controller determines the working state of the device. The controller comprises a main control DSP, an auxiliary DSP, a complex programmable logic device (CPLD), an AD sampling module, an external interface module and a controller power supply module. The main control DSP obtains loading currents detected by a first current sensor through the AD sampling module, harmonic waves are extracted through a trapped wave function, the main control DSP generates a PWM modulation resolution order, the CPLD transmits the PWM modulation resolution to a power module IGBT, the IGBP carries out the PWM modulation order at last, currents which are identical in magnitude of the harmonic waves and opposite in direction of the harmonic waves are output, and accordingly harmonic wave removing is achieved, and meanwhile the main control DSP detects three-phase power grid loading currents, idle currents are extracted in modes such as filtering, and finally the idle currents which are identical in magnitude and opposite in direction are output through a control strategy for compensating reactive power.

Description

technical field [0001] The invention belongs to the application field of power electronics, and relates to a power filtering and reactive power compensation device, in particular to a three-single-phase three-wire parallel APF / SVG device. Background technique [0002] The grid voltage is distorted, and the increase of harmonics will reduce the power supply efficiency, causing a large amount of heat to reduce the service life of the equipment. At the same time, harmonics will cause multiple zero points in the grid voltage, making many measuring equipment unable to work. Mechanism failed. Grid voltage distortion mainly comes from nonlinear loads, such as frequency conversion speed control equipment, rectifier bridges, UPS, computers, TVs, incandescent lamps and other nonlinear loads, and these devices are widely used in daily life. When the sinusoidal voltage is superimposed on the nonlinear load Harmonic currents will be formed. [0003] In the power grid, asynchronous moto...

AI Technical Summary

Problems solved by technology

[0003] In the power grid, asynchronous motors, transformers, electric arc furnaces, rolling mills, etc. will consume reactive power during work, and reactive power will reduce the power factor of the power grid and have adverse effects on the power system.

Unbalanced load will bring additional heat and vibration, and the existence of negative sequence components will affect the criterion when the equipment performs actions and cannot work

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