Control method for restraining oscillate based on mixed electric power filter

A technology of power filter and control method, applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., can solve the problem of high cost, large capacity of active power filter, no To solve problems such as passive filter and active power filter harmonic and inter-harmonic suppression, to achieve the effect of reducing capacity

Inactive Publication Date: 2006-02-15
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

However, due to the large capacity and high cost of the active power filter used alone, it has not been applied in China at present.
[0005] From the above introduction and analysis of th

Method used

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  • Control method for restraining oscillate based on mixed electric power filter
  • Control method for restraining oscillate based on mixed electric power filter
  • Control method for restraining oscillate based on mixed electric power filter

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Embodiment Construction

[0027] Accompanying drawing is the specific embodiment of the present invention;

[0028] Below in conjunction with accompanying drawing, content of the present invention is described in further detail:

[0029] refer to figure 1 As shown, the active power filter APF is connected in parallel with the additional inductance La through the coupling transformer T and then connected with the passive filter Z f connected in series and connected to the grid. Passive filter Z f It is composed of a purely tuned passive filter, and is composed of reactors L tuned to 2 times respectively 2 and capacitor C 2 , 3 times the reactor L 3 and capacitor C 3 and 4 times the reactor L 4 , Capacitor C 4 The series resonant filter is composed of parallel connection, and several branches can be determined according to the filtering and reactive performance indicators. The APF is controlled to be a harmonic current source connected in parallel with the additional inductance La, the main func...

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Abstract

This invention discloses a control method for oscillation suppression based on composite power filter, which introduces APF into PPF to compose composite PF system with compensation performance improved greatly and achieved nation standard. Wherein, arranging inductance La in series with APF to compose current source for harmonic wave and interval harmonic wave and make harmonic compositions in load current flow into composite filter system and interval harmonic compositions flow into power network side, which will bring amplification or resonance, decrease APF capacity. The invention improves greatly harmonic wave compensation effect and reliability for existing PPF device.

Description

technical field [0001] The invention relates to a control method of an active filter, in particular to a control method for suppressing oscillation based on a hybrid power filter. Background technique [0002] Common harmonics generally refer to components whose frequencies are integer multiples of the power frequency (fundamental frequency), while inter-harmonics refer to harmonics of non-integer multiples of the fundamental frequency. Harmonic problems in power systems have attracted widespread attention. As for interharmonics, there is currently a lack of measurement methods in China, and there are few related literatures. In fact, interharmonics and their effects also widely exist in power systems. [0003] At present, the main solution to the harmonic problem of the power system is to install power filters, including passive power filters and active power filters. At present, a large number of applications are passive power filters, which have played a great role in ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 王跃王兆安杨君张晓雷万钧唐晓华司渭滨董强王汝锡
Owner XI AN JIAOTONG UNIV
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