Power grid voltage supporting type modularized active power filter and control algorithm

A power filter and grid voltage technology, applied in active power filtering, AC network to reduce harmonics/ripples, electrical components, etc., can solve problems such as limited capacity expansion

Inactive Publication Date: 2016-03-09
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a power grid voltage support type modular active power filter and a control algorithm that meet high voltage, large capacity, a

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  • Power grid voltage supporting type modularized active power filter and control algorithm
  • Power grid voltage supporting type modularized active power filter and control algorithm
  • Power grid voltage supporting type modularized active power filter and control algorithm

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[0060] specific implementation plan

[0061] Below in conjunction with accompanying drawing, technical scheme implementation is described in further detail:

[0062] The grid-supported modular active power filter is composed of a power main circuit, a detection and sampling device 3, and a control drive part 4. The specific organizational structure is as follows: figure 1 shown. The main power circuit is composed of a grid voltage support part 1 and an active filter part 2 connected in series; the input side of the detection sampling device is respectively connected to the grid-side bus at the coupling point, the load-side distribution line at the coupling point, and the output of the active filter part. The output side is connected to the control drive part; the input side of the control drive part is connected to the output side of the detection and sampling device, and the output side is connected to the power device.

[0063] In the grid voltage support part of the power...

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Abstract

A power grid voltage supporting type modularized active power filter and a control algorithm are provided and belong to an active power filter and a control algorithm. The topology of the active power filter is a serial combination structure of a power grid voltage supporting portion and an active filtering portion. Each phase of the power grid and voltage support portion consists of n power grid voltage supporting module units connected in series, and each unit consists of an H-bridge circuit and a shunt capacitor; and the active filtering portion consists of m active filtering module units connected in parallel, and each unit consists of a three-phase full-bridge circuit, an AC filtering inductor and a shunt capacitor. The power grid voltage supporting portion adopts a carrier phase-shifting modulation technique to track a grid-side voltage of a common coupling point, so as to reduce voltage demands at the DC side of the active portion; and the active filtering portion adopts an improved current prediction technique to track a harmonic current, so as to be adapted to the power grid voltage supporting structure. The algorithm has the advantages of low costs, high reliability, strong universality, and easy extension, and can be widely used in harmonic treatments in high voltage and high power occasions such as petroleum mining and precision manufacturing and tiny weak power grids.

Description

technical field [0001] The invention relates to an active power filter and a control algorithm, in particular to a grid voltage support type modular active power filter and a control algorithm. Background technique [0002] Since the 20th century, non-linear industrial loads such as electric boosting heating equipment, rolling mills, and welding machines have been used extensively, injecting a large amount of reactive power and harmonics into the power grid, endangering the stability of the power grid and the safety of high-precision equipment. Traditional LC tuned passive compensation devices are widely used because of their low cost and large capacity. However, its fixed impedance can only be adjusted in steps for power quality problems, so it is gradually replaced by active power filters. [0003] The shunt active power filter has the ability of flexible harmonic suppression, reactive power compensation and coupling point voltage regulation, so it is widely used to contr...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/00
CPCH02J3/00H02J3/01H02J2203/20Y02E40/20
Inventor 周娟董浩徐青源任国影王超毛海港魏琛刘刚朱玉振唐慧英
Owner CHINA UNIV OF MINING & TECH
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