Series resonance injection type hybrid active filter with convertible structure

A source filter and series resonance technology, applied in the field of series resonance injection hybrid active filter, can solve the problems of consumption, large active power, loss, etc., and achieve the effect of improving comprehensive performance, increasing service life, and improving governance ability.

CN112636350APending Publication Date: 2021-04-09HULUDAO POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-04-09

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Abstract

The invention discloses a series resonance injection type hybrid active filter with a convertible structure. The series resonance injection type hybrid active filter comprises a passive filter bank, an injection branch and an active filter; the injection branch is composed of a capacitor C1, an inductor L1 and a capacitor CO; the output end of the active filter APF is connected in parallel with a fundamental wave series resonance circuit through a coupling transformer to form an injection type active filter; R1 and R2 are switching converters and are responsible for controlling conversion of a hybrid active filter structure; and two ends of the injection branch are respectively connected in series with the passive filter bank through R1 and R2. According to the invention, different working modes can be switched according to different stages of operation of an electric arc furnace, the filter structure in different modes can have good treatment capability on load harmonics in corresponding smelting stages of an electric arc furnace, fundamental wave active power loss is reduced to a certain extent, the comprehensive performance of the hybrid active filter is improved, and the service life of the hybrid active filter is prolonged.
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Description

technical field

[0001] The invention relates to the field of power filtering, in particular to a series resonant injection type hybrid active filter with switchable structure. Background technique

[0002] With the development of society, the demand for steel is increasing. In the steelmaking industry, electric arc furnace steelmaking occupies a large proportion. The development of electric arc furnace technology has led to more and more electric arc furnaces being put into large-scale steel production, and a series of impacts on the power supply side have become more and more obvious. The electric arc furnace uses the principle of alternating current arc heating for steelmaking. The irregular change of the arc length leads to the non-linearity of the arc resistance, which causes the current to be distorted and generates harmonic current. The harmonic current flows into the power supply system and acts on the system. Impedance, resulting in voltage distortion, the generatio...

Examples

Embodiment Construction

[0024] In order to further illustrate the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] like figure 1 , 2 As shown, a structure switchable series resonant injection hybrid active filter SRITHAPF of the present invention includes a passive filter bank PPF1, an injection branch 4, an active filter APF2, and a detection circuit, a control circuit, and a drive circuit ; The injection branch is composed of capacitor C 1 , inductance L 1 and capacitance C O Composition; the active filter APF is a voltage source inverter based on IGBT devices and PWM modulation technology. The outpu...