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Harmonic filtering method and harmonic filtering device for intermediate frequency furnace

A technology for harmonic filtering and intermediate frequency furnaces, which is applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc. It can solve the problems of poor harmonic control effect and inter-harmonic pollution of intermediate frequency furnaces, and achieve continuous smoothness Adjustment effect

Active Publication Date: 2017-02-08
MCC HUATIAN NANJING AUTOMATION ENG
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Problems solved by technology

Because the intermediate frequency furnace produces a large amount of interharmonic pollution, and the frequency of these interharmonics is constantly changing with the smelting process, the traditional parallel LC filter branch has poor harmonic control effect on the intermediate frequency furnace

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  • Harmonic filtering method and harmonic filtering device for intermediate frequency furnace
  • Harmonic filtering method and harmonic filtering device for intermediate frequency furnace
  • Harmonic filtering method and harmonic filtering device for intermediate frequency furnace

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] A harmonic filtering method for an intermediate frequency furnace of the present invention comprises the following steps: Step 1. Install a filter on the side of the power line, and set three filtering channels of 5, 7, 11, and 13 times in the filter, and install a magnetic force filter on each filtering channel. Adjustable magnetron reactor;

[0032] Step 2. Judging the number of rectification pulses of the intermediate frequency furnace, and selecting the corresponding corresponding filter according to the judgment result;

[0033] Step 3. Detect the harmonic frequency of the intermediate frequency furnace load, analyze and calculate the detected harmonic frequency, and obtain the estimated value of the filter reactance;

[0034] Step 4, detecting the actual value of the filter reactance;

[0035] Step 5. Compare the estimated value of the filter reactance w...

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Abstract

The invention discloses a filtering method and a filtering device for an intermediate frequency furnace. The method comprises the steps of detecting the harmonic frequency of an intermediate frequency furnace load, performing analysis calculation for obtaining an anticipated filtering reactance; testing an actual filtering reactance; comparing the anticipated filtering reactance with the tested actual filtering reactance, if the anticipated filtering reactance is equal with the tested actual filtering reactance, keeping the number of turns of a winding coil of a magnetic control reactor unchanged, and keeping a filtering inductance unchanged; if the anticipated filtering reactance is higher than the actual filtering reactance, performing shortcircuit of partial coils in two different winding coils on one iron core in the magnetic control reactor, so that quick excitation is performed on a magnetic valve in the iron core, thereby increasing the filtering inductance; and if the anticipated filtering reactance is lower than the actual filtering reactance, performing shortcircuit of partial coils in one winding coil, thereby realizing quick demagnetization of the magnetic valve in the iron core, and reducing the filtering inductance. According to the filtering method and the filtering device, real-time adjustment on the filtering reactance is realized through testing the harmonic frequency of the intermediate frequency furnace load, thereby realizing resonance of an LC filtering branch circuit at different frequency points, and effectively treating the harmonic wave of the intermediate frequency furnace.

Description

technical field [0001] The invention relates to the technical field of power quality control in the metallurgical industry, in particular to a harmonic filtering method and device for an intermediate frequency furnace. Background technique [0002] The intermediate frequency furnace has the advantages of fast heating speed, high thermal efficiency, uniform heating, and low environmental pollution. It is widely used in industrial occasions such as metal smelting, casting, and heat treatment. At present, it has become an important technical equipment in the metallurgical industry. However, the intermediate frequency furnace generates a large number of harmonics during use, which leads to serious harmonic pollution in the power grid. Therefore, it is necessary to control the harmonics of the intermediate frequency furnace. The current common method for harmonic control of intermediate frequency furnaces is parallel LC filter branch. This method is equivalent to the harmonic po...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 姚自立
Owner MCC HUATIAN NANJING AUTOMATION ENG
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