A three-phase active power filter based on LCL filter and a control method thereof

A power filter and filter technology, which is applied in active power filtering and AC network to reduce harmonics/ripples, etc., can solve problems such as loss, and achieve the effects of suppressing resonance peaks, excellent compensation effects, and accurate tracking

Active Publication Date: 2018-12-21
NORTHEASTERN UNIV
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Problems solved by technology

At present, there are two methods of passive damping and active damping. Passive damping

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  • A three-phase active power filter based on LCL filter and a control method thereof
  • A three-phase active power filter based on LCL filter and a control method thereof
  • A three-phase active power filter based on LCL filter and a control method thereof

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Embodiment Construction

[0035] In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0036] The invention discloses a three-phase active power filter based on LCL filtering, which includes a three-phase inverter T 1 , output filter and control system. Three-phase inverter T 1 It is a voltage-type inverter, and the energy storage element is a DC capacitor C dc ; The output filter is an LCL third-order filter, including the inverter side filter inductor L 1 , filter capacitor C, grid side filter inductance L 2 ; The control system is a current double closed-loop control of grid current detection and inverter side current feedback.

[0037] The control method of this LCL type active power filter: directly control the grid current harmonic component through the grid current detection closed-loop control method, avoiding the detection delay and ...

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Abstract

The invention belongs to the technical field of three-phase active power filter, in particular to a three-phase active power filter based on LCL filter and a control method thereof. Three-phase activepower filter based on LCL filter includes a three-phase inverter, an output filter and a control system. The three-phase inverter is a voltage-type inverter, and the energy storage original is a direct current capacitor; The output filter is a third-order filter, comprising an inverter-side filter inductor, a filter capacitor and a grid-side filter inductor; The control system is a current doubleclosed loop control of current detection and current feedback at the inverter side. The invention directly controls the harmonic component of the electric network current through the electric networkcurrent closed-loop control mode, thereby avoiding the detection delay and the assignment phase offset existing in the traditional load current detection method. Virtual damping is introduced to suppress the resonant peak of LCL filter through current feedback on inverter side.

Description

technical field [0001] The invention belongs to the technical field of three-phase active power filters, and in particular relates to a three-phase active power filter based on LCL filtering and a control method thereof. Background technique [0002] With the wide application of power electronic converters, electric energy has been more fully utilized, but the widespread use of a large number of nonlinear load devices in the power grid has made the problem of harmonic pollution in the power grid increasingly serious, and harmonic control has become more and more important. more attention. Compared with the traditional passive power filter composed of inductors, capacitors and resistors, the active power filter (Active Power Filter, APF) has good filtering characteristics, high controllability, fast response speed, flexible application, etc. features. With the reduction of the cost of semiconductor devices, APF has gradually become a research hotspot and development directi...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 刘震潘楠王大志张春艳
Owner NORTHEASTERN UNIV
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