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Active power filter method with D.C. source and branch impedance decoupling control and its system

A branch impedance and decoupling control technology, applied in electrical components, output power conversion devices, etc., can solve problems such as ripple suppression effect and ripple phase shift in concerned frequency bands.

Inactive Publication Date: 2006-02-01
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the digital implementation of this existing active power filter control method, there is a delay that is difficult to compensate in the process of measurement sampling, algorithm calculation, and pulse width modulation, which will cause a large phase shift to the ripple in the frequency band of interest. And seriously affect the effect of ripple suppression

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  • Active power filter method with D.C. source and branch impedance decoupling control and its system
  • Active power filter method with D.C. source and branch impedance decoupling control and its system
  • Active power filter method with D.C. source and branch impedance decoupling control and its system

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Embodiment Construction

[0084] A specific embodiment of the present invention is designed to reduce the low-frequency ripple noise loaded on the transmission line by the rectifier circuit in the 500 kV direct current transmission system. A circuit that converts alternating current to direct current is Figure 7 As shown, the three-phase AC bus frequency is 50 Hz, and the line voltage is 382.9 kV; the transformation ratios of the star / delta type transformer T1 and the star / star type transformer T2 are both 345.0 kV: 213.5 kV, and the rated capacity 603.7 MVA, the unit value of the short-circuit impedance is 0.18; a rectifier bridge T composed of 12 thyristors is used to realize a 12-pulse rectification circuit, the conduction control angle is 5 degrees, and the output DC voltage is about 500 kV. The voltage generated by the rectification circuit mainly contains low-frequency ripples of 600, 1200, 1800 and 2400 Hz, and the voltage will be input into the active power filter system of the present inventi...

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Abstract

The present invention relates to an active filtering method and system, belonging to the field of DC transmission. The method utilizes the bandpass filter to implement frequency domain controlled decoupling, and utilizes two phase shift filters whose phase shift mutual difference is 90 deg. to make treatment and form the decoupling control of filter branch resistance and reactance, and regulates the total reactance of filter branch in the concerned ripple frequency point to make it be equal to zero or approaching to zero so as to filter the ripple of the frequency point. The current on the filter branch is undergone the processes of bandpass filter, weighting and summation, phase-shifting filtering, summation, phase-duration modulation and pulse driving to control existent active power filter whose power is supplied by DC source.

Description

technical field [0001] The present invention relates to an active power filter method and system for branch impedance decoupling control with a DC source. The impedance value in the ripple frequency band is zero to suppress and eliminate low frequency ripple noise. The invention belongs to the technical field of direct current power supply. Background technique [0002] The DC transmission voltage or the DC power supply voltage obtained by rectifying the AC signal contains a large amount of low-frequency ripple noise. These ripple noises will increase the equipment burden on the DC transmission line of the power system, resulting in power loss, and its electromagnetic radiation will also interfere with communication equipment. The ripple noise in the DC power supply will interfere with the useful signal in the load equipment, seriously affecting the normal operation of the equipment. The traditional way to suppress and eliminate ripple noise is to use a filter circuit com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/02H02M1/14
Inventor 庞浩王赞基
Owner TSINGHUA UNIV
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