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Hybrid active power filter and its control method

A power filter, source filter technology, applied in active power filtering, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc. The power filter does not have the ability to effectively control the output compensation current and the ability to suppress the overload.

Active Publication Date: 2007-05-30
山东华天科技集团股份有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] The purpose of the present invention is to solve the problem that the existing hybrid active power filter does not have the effective control ability and overload suppression ability of the output compensation current, which seriously affects its operation safety and adaptability to load changes.

Method used

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  • Hybrid active power filter and its control method

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Embodiment Construction

[0070] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0071] As shown in Figure 3, a hybrid active power filter consists of an active filter 1 and a passive filter 2 in series to form a filter branch, which is connected in parallel with the nonlinear load that needs to be filtered, and it also includes Current detector I3 for grid current detection and current detector II4 for compensation current detection; among them, current detector I3 and current detector II4 are both current transformers, and the primary side of current detector I is connected in series in the grid input circuit, and the two The secondary side is connected to the current detection unit I1-1 in the active filter, the primary side of the current detector II is connected in series in the filter branch, and the secondary side is connected to the current detection unit II1-2 in the active filter.

[0072]As shown in Figure 4, the active f...

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Abstract

This invention discloses one mixture power filter and its control method, wherein, it comprises the following structure: forming filter branch by source filter and filter without source and the branch and the needed non-linear load are connected; it also comprises electricity network current test device and compensation tester with one end of test connected with input circuit and other end with source filter and the tester two one end is connected to filter branch and other end with source filter.

Description

technical field [0001] The invention relates to a power filter, in particular to a hybrid active power filter and a control method thereof. Background technique [0002] Passive power filter and active power filter are the main technical means of power harmonic control. Passive power filters have the advantages of large capacity, simple structure, and low cost, but the filtering effect is poor, and problems such as detuning, resonance, and overload are prone to occur; active power filters have good filtering effects, but the capacity is small and the cost high. The hybrid active power filter composed of passive power filter and active power filter combines the advantages of active power filter and passive power filter, and has the advantages of large capacity, good filtering effect and low cost. , is an important development direction of power harmonic control technology. [0003] Figure 1 is the most commonly used hybrid active power filter structure, which connects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 李建明迟恩先
Owner 山东华天科技集团股份有限公司
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