Compound control method of injection mixed active power filter

A power filter and hybrid technology, applied in active power filtering, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as voltage instability and operation instability, and eliminate the impact. , avoid series-parallel resonance, improve the effect of harmonic control

Inactive Publication Date: 2007-08-15
HUNAN UNIV
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  • Description
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Problems solved by technology

[0005] In order to solve the above-mentioned technical problem that the DC side voltage instability of the hybrid active power filter easily leads to unstable operation, the present invention provides a composite control method for a hybrid active power filter with good filtering effect and stable operation

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  • Compound control method of injection mixed active power filter
  • Compound control method of injection mixed active power filter
  • Compound control method of injection mixed active power filter

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[0022] Referring to Figure 1, the hybrid active power filter is mainly composed of an active part, an output filter, an isolation transformer, a fundamental series resonant circuit and a passive part. Referring to Figure 1, CT is a current transformer, which monitors the grid harmonic current and sends the signal to an active power filter for generating a reference compensation signal. L 2 、C 2 connected in series, and choose an appropriate L 2 、C 2 making it series resonant at the fundamental frequency, so C 1 It will bear most of the grid voltage, and the active power filter will bear a small harmonic voltage; the active power filter is connected in parallel with the fundamental resonant circuit through an isolation transformer, and the capacitor C 1 After being connected in series with the above-mentioned parallel branch, it is connected in parallel with a passive power filter and a nonlinear load, and then connected to the power grid. The active power filter is a volt...

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Abstract

The disclosed composite control method for injection-type hybrid active filter comprises: detecting harmonic current on load / power-network side to obtain the load / power-network harmonic current loop control output; detecting the access harmonie voltage of filter to obtain harmonic voltage loop control output; adding all output to obtain the command control signal. This invention eliminates the danger to active filter led by harmonic voltage.

Description

technical field [0001] The invention relates to a compound control method of an injection hybrid active power filter. Background technique [0002] With the wide application of power electronic devices in industry, the problem of harmonic pollution of power grid is becoming more and more serious. Harmonics not only affect the normal operation of electrical equipment, but also bring hidden dangers to the safe and economical operation of the power grid. At present, the filters that eliminate harmonics mainly include passive filters, active filters and hybrid filters. The filtering characteristics of passive filters are determined by the ratio of grid impedance to filter branch impedance, and are greatly affected by grid system parameters. Although the active filter can overcome the defects of the passive filter, it is difficult to independently mount and operate on the high-power high-voltage power grid due to the limitation of the capacity and cost of its switching devices....

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 罗安帅智康赵伟范瑞祥汤赐
Owner HUNAN UNIV
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