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Network harmonic and flash comprehensive inhibitor

A technology for suppressing devices and power grids, applied in harmonic reducing devices and AC networks to reduce harmonics/ripples, etc., can solve the problems of large loss, sensitivity to grid impedance and frequency changes, and large size, achieving high reliability, Flicker suppression, reasonable cost-effective effect

Inactive Publication Date: 2009-09-16
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The traditional passive LC filter can reduce harmonics and improve the power factor of AC loads, but there are obvious deficiencies and defects; the designed passive filter usually selects a specific frequency and can only filter out specified sub-harmonics; there are Possibility of resonance with grid; also sensitive to grid impedance and frequency variations
In addition, there are also problems such as large volume and large loss.

Method used

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  • Network harmonic and flash comprehensive inhibitor
  • Network harmonic and flash comprehensive inhibitor
  • Network harmonic and flash comprehensive inhibitor

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] A power grid harmonic and flicker comprehensive suppression device, including a main circuit 1 and a control circuit 2, the control circuit 2 respectively obtains the voltage signal and current signal of the power grid through a voltage sensor PT1 and a current sensor CT3, and the control circuit 2 respectively through the voltage sensor PT2 , current sensors CT1, CT2 obtain the DC voltage signal, input current signal and output current signal of the main circuit 1, the control drive signal port of the control circuit 2 is connected to the control drive terminal of the main circuit 1, and the above control circuit 2 is also used to sample The obtained grid three-phase current ia, ib, and ic data are transformed to obtain equivalent conductance Gp(t) and Gq(t), and then the AC components Gph and Gqh of the equivalent conductance are obtained, and the equivalent conductance AC component and harmonic and reactive power are used The linear relationship of the current, throug...

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Abstract

This is a device for harmonic wave and flickering restriction. It includes a main circuit and control circuit. The control circuit obtains voltage and current signals from the networks by voltage and current sensor, as well as the AC voltage signal, output current signal, input current signal from the main circuit by sensors. The driving signal terminals of the control circuit are linked to that of the main circuit. The control circuit changes the obtained ia, ib, ic from the networks to equivalent conductance Gp(t), Gq(t) and then the AC component Gph, Gqh. The compensating current component ialphah, ibetah, iOh for restriction is obtained by linear change.

Description

technical field [0001] The invention relates to a power grid harmonic and flicker comprehensive suppression device based on IGBT devices, and belongs to the technical field of harmonic compensation in terms of power quality. Background technique [0002] Since the 1980s, with the development of power electronics technology, nonlinear power electronic devices and devices have been widely used in modern industry. For engineering applications, speed-regulating motors and reactive power compensation capacitors have also been put into operation in large quantities. The operation of these devices makes the voltage and current waveform distortion in the power grid more and more serious, and the harmonic level continues to rise. In addition, impact and fluctuating loads, such as electric arc furnaces, large rolling mills, electric locomotives, etc., will not only generate a large number of high-order harmonics during operation, but also generate voltage fluctuations, flicker, three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 郑建勇梅军丁祖军曾伟袁涛康静沈亚飞陈娟
Owner SOUTHEAST UNIV
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