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Output filter circuit of active power filter, filtering method and design method

A technology of power filter and output filter, which is applied in active power filter and AC network to reduce harmonics/ripples, etc., and can solve problems such as not being able to meet the requirements of harmonics

Inactive Publication Date: 2014-05-14
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, the active power filter adopts PWM modulation technology, and the output current contains rich high-frequency harmonics and switching harmonics. It is difficult for traditional L and LCL output filter circuits to effectively suppress high-order harmonics while ensuring the bandwidth of the active power filter. Switching harmonics cannot meet the requirements of IEEE519-1992 on harmonics

Method used

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  • Output filter circuit of active power filter, filtering method and design method
  • Output filter circuit of active power filter, filtering method and design method
  • Output filter circuit of active power filter, filtering method and design method

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Embodiment 1

[0134] The following will be described in detail in conjunction with the accompanying drawings, but not as a limitation of the present invention.

[0135] A new output filter circuit (DRLCL) structure of an active power filter (active power filter):

[0136] The DRLCL circuit is characterized in that, by the inverter side inductance L 1 , Grid side inductance L 2 , grid side parallel resistance R g , damping branch R d C d , Qualcomm branch C h , Single switching harmonic branch C f L f , double switch harmonic branch C fd L fd constitute;

[0137] Among them, the inverter side inductance L 1 Connected between point C on the inverter side and common point B of the parallel branch; grid side inductance L 1 Connected between point A on the grid side and common point B of the parallel branch; parallel resistor R on the grid side g Parallel to grid side inductance L 2 Both ends; R in the damping branch d with C d Connected in series between the common points B and D...

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Abstract

The invention discloses an output filter circuit of an active power filter, a filtering method and a design method. The output filter circuit of the active power filter comprises an inverter side inductor L1, a network side inductor L2, a network side shunt resistor Rg, a damping branch RdCd, a high pass branch Ch, a single-switch harmonic branch CfLf and a double-switch harmonic branch CfdLfd. According to the output filter circuit of the active power filter, the filtering method and the design method, a DRLCL circuit can effectively filter out higher harmonic higher than 1kHz, single-switch harmonic and double-switch harmonic, the filtering effect fully meets the requirements of all orders of harmonic in IEEE519-1992, and the complexity of a control system will not be increased.

Description

technical field [0001] The invention relates to an output filter circuit, a filter method and a design method of an active power filter, belonging to the field of power electronic device design. Background technique [0002] With the development of modern industry, power electronic converters are used more and more widely, and the application degree of power electronics has become an important symbol of industrial modernization. At the same time, due to the application of a large number of power electronic devices in the power grid, the waveforms of voltage and current are severely distorted, because power electronic devices have nonlinear factors, on the one hand, they can meet people's increasing demands for electric energy, On the other hand, the use of a large number of power electronic components will cause harmonic pollution to the power supply quality of the power grid, and various accidents caused by harmonics will continue to occur. Modern enterprises and some sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 于晶荣徐勇陈岗邹勇军程美红
Owner CENT SOUTH UNIV
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