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A three-phase active power filter based on lcl filter and its control method

A power filter and filter technology, applied in active power filter, AC network to reduce harmonics/ripples, etc., can solve problems such as loss, achieve resonance peak suppression, accurate tracking of command current, compensation effect and real-time sexually superior effect

Active Publication Date: 2021-05-25
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

At present, there are two methods of passive damping and active damping. Passive damping is simple and reliable, but the loss is serious in the case of high voltage and high power

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  • A three-phase active power filter based on lcl filter and its control method
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  • A three-phase active power filter based on lcl filter and its control method

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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 filters, and in particular relates to a three-phase active power filter based on LCL filtering and a control method thereof. The three-phase active power filter based on LCL filtering 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 element is a DC capacitor; the output filter The filter is a third-order filter, including an inverter-side filter inductor, a filter capacitor, and a grid-side filter inductor; the control system is a current double-closed-loop control of grid current detection and inverter-side current feedback. The present invention directly controls the grid current harmonic component through the grid current closed-loop control mode, avoiding the detection delay and assignment phase offset existing in the traditional load current detection method; introducing virtual damping to suppress the LCL filter through the inverter side current feedback resonance peak.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 刘震潘楠王大志张春艳
Owner NORTHEASTERN UNIV LIAONING
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