Multi-channel harmonic wave restraining device

Abstract

The multichannel harmonic suppressor with inductance coil and capacitor of low voltage and power belongs to power network control device and overcomes the shortcoming in existing technique to decrease cost and volume and satisfy require for high voltage and current. Wherein, joining the product in series with power network bus-bar, arranging i winding coils on sub converter connected to inductance coil and capacitor in series to constitute series resonant circuit of inductance and capacitor, wherein, it should be ªÏL=1 / ªÏC for working frequency ªÏ; all the inductance value and capacitor value equals, so does the number of turns and geometric size. This invention is convenient to maintenance.

Description

technical field [0001] The invention belongs to electric network control equipment in the electrical technology, and particularly relates to a high-power harmonic suppression device, which is used for suppressing the harmonic current generated by high-power nonlinear loads. Background technique [0002] The Chinese invention patent application "harmonic suppression device" with application number 02139029.0 is to form a series resonant circuit for the fundamental wave through the secondary fundamental winding, inductance coil and capacitor of the converter to realize the primary and secondary harmonics of the converter. The fundamental ampere-turn balance between them makes the converter present low impedance to the primary fundamental current and high impedance to the harmonic current, allowing the fundamental current to pass smoothly and effectively suppressing most of the harmonic current. For the remaining part of the first harmonic current, the active filtering composed...

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Problems solved by technology

This device has the following disadvantages: (1) Since this converter has only one secondary fundamental winding, that is, there is only one branch circuit to form a series resonant circuit of the secondary fundamental winding, inductance coil, and capacitor, so that it can be connected with the primary fundamental current Ampere-turn balance, when the primary side current is very large, the secondary side current will also be very large, because the power of the inductance coil and capacitor is large, the price is high, the volume and weight are also large, and the application is limited

(2) The active filtering method composed of detection iron core, detection winding, operational amplifier, driver and harmonic winding is adopted to further offset the residual harmonic current. Since the proportion of residual harmonic current is not large, the detection iron Core, detection windings, operational amplifiers, drivers, and harmonic windings constitute an active filtering method, which has high complexity and cost, reduced reliability, and uneconomical input-output ratio.

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