Resonant-impedance type hybrid active electric filter and control method thereof

A power filter and resonant impedance technology, applied in the field of hybrid active power filter, can solve the problems of high cost, large fundamental wave impedance, parallel resonance injection type APF does not have reactive power compensation capability, etc. The effect of reducing the capacity

A power filter and resonant impedance technology, applied in the field of hybrid active power filter, can solve the problems of high cost, large fundamental wave impedance, parallel resonance injection type APF does not have reactive power compensation capability, etc. The effect of reducing the capacity

CN1710771AInactive Publication Date: 2005-12-21HUNAN UNIV
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  • Resonant-impedance type hybrid active electric filter and control method thereof
  • Resonant-impedance type hybrid active electric filter and control method thereof
  • Resonant-impedance type hybrid active electric filter and control method thereof

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, the patent of the present invention is further described.

[0032] like figure 1 As shown, when the passive filter part of the resonant impedance type hybrid active power filter compensates the reactive power with a large capacity, the fundamental wave impedance of the PF is small, and a large fundamental wave reactive current flows into the PF. At this time, since the series resonant circuit resonates at the fundamental frequency, its fundamental impedance is approximately 0, which is equivalent to the short-circuit channel of the fundamental current, so the fundamental current flowing through PF will flow into the fundamental resonant circuit instead of Coupling transformer and inverter; moreover, compared with PF, the fundamental wave voltage drop borne by the fundamental wave resonant circuit is small, and most of it is shared by PF. Therefore, the static compensation of reactive power by the PF in the resonant impeda...

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Abstract

The disclosed filter includes active power filter (APF) and passive filter (PF). Output of APF is connected to primary side of isolating transformer. Being connected to series resonance circuit in parallel, the isolating transformer is connected to PF in series, and then connected to electric network. Steady state error of APF is lowered through iterative control algorithm of improper integral. Result output from the control algorithm is as equivalent control in slipform variable structure control, realizing combination of two methods so as to form triplet variable control structure. Comparing with slipform variable structure control or iterative control of improper integral adopted in solely, the invention possesses features of quicker responsibility and smaller steady state error.

Description

technical field [0001] The invention relates to a hybrid active power filter, in particular to a resonant impedance type hybrid active power filter. Background technique [0002] Electric energy is the main and essential energy in the production of modern society and people's life. With the development of power electronics technology, a large number of nonlinear loads have been added to the power supply system. It is a nonlinear time-varying topological load, which cannot Avoidance will generate non-sinusoidal waveforms and inject harmonics into the grid, which has become a "public nuisance" in the grid. Harmonic suppression devices mainly include passive power filters or active power filters. [0003] Although the passive filter used alone is low in cost and simple in structure, the filtering effect is greatly affected by the grid impedance and its own parameter changes, and it is easy to resonate with the grid impedance. Although the active power filter used alone has go...

Claims

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Application Information

Patent Timeline
21 Dec 2005
Publication
CN1710771A
IPC
H02J3/01
CPC
Y02E40/20
Inventors
罗安; 刘尧