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Transformerless hybrid power filter and design method thereof

A hybrid power and filter technology, applied to electrical components, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve voltage matching imbalance, affect system stability, and active output switch harmonics The voltage is not isolated, etc.

Inactive Publication Date: 2014-11-19
WUHAN UNIV OF TECH
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Problems solved by technology

[0002] A high-voltage passive filter in series with a low-voltage active filter through a coupling transformer is one of the common structures to form a hybrid active filter. However, due to the existence of the coupling transformer, the filtering characteristics of the system will be degraded; It will bring problems such as unbalanced voltage matching between high-voltage and low-voltage modules in the system, active output switch harmonic voltage not being isolated, etc., which affect system stability

Method used

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  • Transformerless hybrid power filter and design method thereof
  • Transformerless hybrid power filter and design method thereof
  • Transformerless hybrid power filter and design method thereof

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Embodiment Construction

[0055] like figure 1 As shown, the present invention includes grid side voltage source, system impedance, inverter side DC current source, active voltage source, passive filter branch, passive series fundamental wave resonance branch and output filter. Both the passive filtering branch and the first passive series fundamental wave resonant branch use LC filters. The output filter adopts LCL filter circuit with damping resonance.

[0056] One end of the voltage source on the grid side is connected to the other end of the voltage source through the system impedance through the passive filter branch and the passive series fundamental resonance branch connected in series; one end of the voltage source is also connected through the system impedance and through The DC current source on the inverter side is connected to the other end of the voltage source; the output filter is connected to the phase point of the passive filter branch and the passive series fundamental resonance bran...

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Abstract

The present invention discloses a transformerless hybrid power filter. The transformerless hybrid power filter comprises a power grid-side voltage source, a system impedance, an inverter-side DC source, an active voltage source, a passive filter branch, a passive series fundamental wave resonance branch and an output filter. The passive filter branch and the passive series fundamental wave resonance branch are both based on LC filters, the output filter is based on an LCL filter circuit with the damping resonance, and one end of the power grid-side voltage source is connected with the other end of the voltage source via the system impedance, and via the passive filter branch and the passive series fundamental wave resonance branch which are in series connection with each other. One end of the voltage source is connected with the other end of the voltage source via the system impedance and via the inverter-side DC source, the connection point of the passive filter branch and the passive series fundamental wave resonance branch is connected with the output filter, and the output filter is connected with the two ends of the active voltage source. According to the present invention, the filter characteristic and the system stability are guaranteed on the condition of not having a coupling transformer.

Description

technical field [0001] The invention relates to a transformerless hybrid power filter and a design method. Background technique [0002] A high-voltage passive filter in series with a low-voltage active filter through a coupling transformer is one of the common structures to form a hybrid active filter. However, due to the existence of the coupling transformer, the filtering characteristics of the system will be degraded; It will bring problems such as unbalanced voltage matching between high-voltage and low-voltage modules in the system, and unisolated harmonic voltage of active output switches, which will affect system stability. Contents of the invention [0003] The object of the present invention is to provide a transformerless hybrid power filter and a design method that ensure filter characteristics and system stability. [0004] The transformerless hybrid power filter provided by the present invention includes a grid-side voltage source, a system impedance, an inv...

Claims

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Application Information

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IPC IPC(8): H03H21/00H02J3/01
CPCY02E40/40
Inventor 陈岗刘泉何雄
Owner WUHAN UNIV OF TECH
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