WO2007075057A1 - An apparatus of hybrid filter type for reduction of harmonic frequency - Google Patents

An apparatus of hybrid filter type for reduction of harmonic frequency Download PDF

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Publication number
WO2007075057A1
WO2007075057A1 PCT/KR2006/005799 KR2006005799W WO2007075057A1 WO 2007075057 A1 WO2007075057 A1 WO 2007075057A1 KR 2006005799 W KR2006005799 W KR 2006005799W WO 2007075057 A1 WO2007075057 A1 WO 2007075057A1
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WO
WIPO (PCT)
Prior art keywords
power system
load
unit
power
filter unit
Prior art date
Application number
PCT/KR2006/005799
Other languages
French (fr)
Inventor
Hoon Yang Park
Original Assignee
Enertech Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Enertech Co., Ltd filed Critical Enertech Co., Ltd
Priority to BRPI0622172-6A priority Critical patent/BRPI0622172A2/en
Publication of WO2007075057A1 publication Critical patent/WO2007075057A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the present invention relates to a hybrid type harmonic reduction apparatus, and in particular, hybrid type harmonic reduction apparatus that reduces harmonics on a power line in a power system having a three-phase multi-wire connection structure.
  • NGR neutral grounding reactor
  • 10-2003-0078522 that uses the above-described reactor includes a power system 1, a load 3 to which power is applied from the power system 1, a reactor 2 that is connected between the power system 1 and the load 3 and can be implemented in various winding methods, and a resistor, an inductor, and a capacitor that are connected between the power system 1 and the reactor 2.
  • a video harmonic current generated in the load 3 flows into the load 3 again through the reactor 2 having low video impedance, and only unbalanced components of a normal current and a reverse current flow through a neutral line N of the power system. Accordingly, a large video harmonic current can be prevented from flowing in the neutral line of the power system.
  • the invention has been finalized in order to solve the drawbacks inherent in the related art, and an object of the invention is to provide a hybrid type harmonic reduction apparatus that can reduce harmonics generated from a load to be applied to a power system through a circuit configuration of an active filter unit and a passive filter unit connected in parallel on a power line of a power system having a three-phase multi-wire connection structure, that is, a hybrid type filter circuit configuration.
  • Another object of the invention is to adjust critical impedance in a power system and correct a signal waveform in a load by providing variable resistive units for waveform correction in the power system and the load respectively.
  • a harmonic reduction apparatus includes a power system that supplies power, a load that is supplied with power applied from the power system, a hybrid filter circuit unit that is connected to each phase line and a neutral line in order to reduce harmonics to be generated on the load and applied to the power system, and has an active filter unit and a passive filter unit connected in parallel with each phase line and the neutral line between the power system and the load, the active filter unit and the passive filter unit being connected in series, a first waveform correction unit that is connected between the power system and the hybrid filter circuit unit so as to adjust critical impedance of the power system and to correct a signal waveform, and a second waveform correction unit that is connected between the hybrid filter circuit unit and the load so as to prevent an overload and to correct a signal waveform.
  • the hybrid type harmonic reduction apparatus of the invention when harmonics are applied from the load to the power system on the power line, most of the harmonic current is applied to the passive filter.
  • the active filter complements the passive filter, such that a ratio of cutting off the harmonics to be applied to the power system can be increased with small capacity of the active filter.
  • the waveform correction units respectively provided in the power system and the load it is possible to stabilize power to be applied, to prevent an overload, and to implement a signal waveform to be applied in a form close to a sinusoidal signal.
  • FlG. 1 is a diagram showing the configuration of a known apparatus that reduces harmonics on a power line
  • FlG. 2 is a block diagram showing a harmonic reduction apparatus according to an embodiment of the invention that reduces harmonics on a power line;
  • FlG. 3 is a circuit diagram showing a harmonic reduction apparatus according to the embodiment of the invention that reduces harmonics on a power line. Mode for the Invention
  • a harmonic reduction apparatus includes a power system 10 that supplies power, a load 30 that is supplied with power applied from the power system 10, a hybrid filter circuit unit 50 that is connected to each phase line and a neutral line between the power system and the load so as to reduce harmonics to be generated on the load 30 and applied to the power system 10, and has an active filter unit (80 of FlG. 3) and a passive filter unit (60 of FlG.
  • a first waveform correction unit 40a that is connected between the power system 10 and the hybrid filter circuit unit 50 so as to adjust critical impedance of the power system and to correct a signal waveform
  • a second waveform correction unit 40b that is connected between the hybrid filter circuit unit 50 and the load 30 so as to prevent an overload and to correct a signal waveform.
  • the power applied to the load 30 is alternating, and a connection structure of the power system 10 is a three-phase multi-wire connection structure.
  • the first waveform correction unit 40a is a variable resistive unit that is connected to each phase line and the neutral line of the power system 10
  • the second waveform correction unit 40b is a variable resistive unit that is connected to each phase line and the neutral line of the power line connected to the load.
  • the hybrid filter circuit unit 50 has a passive filter and an active filter, which is shown in a circuit diagram of FlG. 3.
  • each of the reactors Ll to L4 is connected in parallel with one of each of capacitors Cl to C4, and the other end of each of the capacitors Cl to C4 is connected in series to an end of each of the reactors L5 to L8 of the active filter unit 80. That is, one end of each of the reactors Ll to L4 of the passive filter unit 60 is connected in parallel to the neutral line N as well as each phase line between the power system and the load, such that the harmonic current applied from the load through each phase line and the neutral line of the power system can be completely cut off.
  • a matching transformer 70 is connected between the passive filter unit 60 and the active filter unit 80 so as to match different impedance characteristics between the passive filter unit and the active filter unit.
  • this embodiment suggests the hybrid filter circuit unit, that is, the circuit configuration of the passive filter unit 60 and the active filter unit 80 connected in series, thereby cuttng off the harmonic current component, so as to cut off a harmonic current component to be generated on the load 30 and applied to the power system 10.
  • the passive filter unit 60 primarily filters the harmonic current component applied from the load 30 to the power system 10.
  • the primarily filtered harmonic current component is secondarily filtered through the circuit configuration of the active filter unit 80 that is connected in series to the passive filter unit 60.
  • the matching transformer 70 that is connected in series between the passive filter unit 60 and the active filter unit 80, different impedance characteristics between the passive filter unit 60 and the active filter unit 80 can be adjusted.
  • the active filter unit 80 can filter the harmonic current component with small capacity. Then, the harmonic component flowing from the load 30 into each phase line and the neutral line of the power system 10 can be completely cut off. That is because the active filter unit 80 is an element for complementing the passive filter unit 60, and thus, the filter capacity can be small. Therefore, harmonic current applied to the power system can be cut off with small capacity.
  • variable resistive units 40a (Rl to R4) are respectively connected to the phase lines and the neutral line of the power system 10
  • variable resistive units 40b Rl' to R4'
  • the critical impedance of the power system 10 is reduced, and thus the applied power is stabilized.
  • the signal waveform is improved close to a sine wave. Further, an overload is prevented and the signal waveform is improved close to a sinusoidal signal in the load 30.
  • the passive filter that is connected in parallel with each phase line and the neutral line between the power system and the load, and the active filter that is connected in series to the passive filter are provided.
  • the variable resistive units are respectively provided in the power system and the load so as to stabilize power in the power system and the load, to prevent an overload, and to apply the signal waveform close to a sinusoidal signal.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to a hybrid type harmonic reduction apparatus that reduces harmonics on a power line. The hybrid type harmonic reduction apparatus includes a power system that supplies power, a load that is supplied with power applied from the power system, a hybrid filter circuit unit that is connected to each phase line and a neutral line in order to reduce harmonics generated in the load and applied to the power system, and has an active filter unit and a passive filter unit connected in parallel with each phase line and the neutral line between the power system and the load, the active filter unit and the passive filter unit being connected in series, a first waveform correction unit that is connected between the power system and the hybrid filter circuit unit so as to adjust critical impedance of the power system and to correct a signal waveform, and a second waveform correction unit that is connected between the hybrid filter circuit unit and the load so as to prevent an overload and to correct a signal waveform.

Description

Description
AN APPARATUS OF HYBRID FILTER TYPE FOR REDUCTION
OF HARMONIC FREQUENCY
Technical Field
[1] The present invention relates to a hybrid type harmonic reduction apparatus, and in particular, hybrid type harmonic reduction apparatus that reduces harmonics on a power line in a power system having a three-phase multi-wire connection structure. Background Art
[2] Most of the known apparatuses for reducing harmonics on a power line use a neutral grounding reactor (NGR) device in order to reduce harmonics.
[3] As shown in Fig. 1, a harmonic reduction apparatus (Korean Patent Application No.
10-2003-0078522) that uses the above-described reactor includes a power system 1, a load 3 to which power is applied from the power system 1, a reactor 2 that is connected between the power system 1 and the load 3 and can be implemented in various winding methods, and a resistor, an inductor, and a capacitor that are connected between the power system 1 and the reactor 2. With this circuit configuration, a video harmonic current generated in the load 3 flows into the load 3 again through the reactor 2 having low video impedance, and only unbalanced components of a normal current and a reverse current flow through a neutral line N of the power system. Accordingly, a large video harmonic current can be prevented from flowing in the neutral line of the power system.
Disclosure of Invention Technical Problem
[4] However, since the known harmonic reduction apparatus requires a reactor element, costs and weight of the harmonic reduction apparatus are increased.
[5] The invention has been finalized in order to solve the drawbacks inherent in the related art, and an object of the invention is to provide a hybrid type harmonic reduction apparatus that can reduce harmonics generated from a load to be applied to a power system through a circuit configuration of an active filter unit and a passive filter unit connected in parallel on a power line of a power system having a three-phase multi-wire connection structure, that is, a hybrid type filter circuit configuration.
[6] Another object of the invention is to adjust critical impedance in a power system and correct a signal waveform in a load by providing variable resistive units for waveform correction in the power system and the load respectively.
Technical Solution
[7] In order to achieve the above-described objects, according to an aspect of the invention, a harmonic reduction apparatus includes a power system that supplies power, a load that is supplied with power applied from the power system, a hybrid filter circuit unit that is connected to each phase line and a neutral line in order to reduce harmonics to be generated on the load and applied to the power system, and has an active filter unit and a passive filter unit connected in parallel with each phase line and the neutral line between the power system and the load, the active filter unit and the passive filter unit being connected in series, a first waveform correction unit that is connected between the power system and the hybrid filter circuit unit so as to adjust critical impedance of the power system and to correct a signal waveform, and a second waveform correction unit that is connected between the hybrid filter circuit unit and the load so as to prevent an overload and to correct a signal waveform. Advantageous Effects
[8] According to the hybrid type harmonic reduction apparatus of the invention, when harmonics are applied from the load to the power system on the power line, most of the harmonic current is applied to the passive filter. Here, the active filter complements the passive filter, such that a ratio of cutting off the harmonics to be applied to the power system can be increased with small capacity of the active filter. In addition, with the waveform correction units respectively provided in the power system and the load, it is possible to stabilize power to be applied, to prevent an overload, and to implement a signal waveform to be applied in a form close to a sinusoidal signal. Brief Description of the Drawings
[9] FlG. 1 is a diagram showing the configuration of a known apparatus that reduces harmonics on a power line;
[10] FlG. 2 is a block diagram showing a harmonic reduction apparatus according to an embodiment of the invention that reduces harmonics on a power line; and
[11] FlG. 3 is a circuit diagram showing a harmonic reduction apparatus according to the embodiment of the invention that reduces harmonics on a power line. Mode for the Invention
[12] Hereinafter, a preferred embodiment of the invention will be described with reference to the drawings.
[13] In a power system according to this embodiment, the configuration of an apparatus for reducing a harmonic current to be generated in a load and applied to the power system when power is applied to the load through a power line will be described with reference to FlG. 2.
[14] As shown in FlG. 2, a harmonic reduction apparatus according to this embodiment includes a power system 10 that supplies power, a load 30 that is supplied with power applied from the power system 10, a hybrid filter circuit unit 50 that is connected to each phase line and a neutral line between the power system and the load so as to reduce harmonics to be generated on the load 30 and applied to the power system 10, and has an active filter unit (80 of FlG. 3) and a passive filter unit (60 of FlG. 3) connected in parallel with each phase line and the neutral line between the power system and the load, the active filter unit and the passive filter unit being connected in series, a first waveform correction unit 40a that is connected between the power system 10 and the hybrid filter circuit unit 50 so as to adjust critical impedance of the power system and to correct a signal waveform, and a second waveform correction unit 40b that is connected between the hybrid filter circuit unit 50 and the load 30 so as to prevent an overload and to correct a signal waveform.
[15] According to the above-described configuration, in the power system 10 according to this embodiment the power applied to the load 30 is alternating, and a connection structure of the power system 10 is a three-phase multi-wire connection structure.
[16] The first waveform correction unit 40a is a variable resistive unit that is connected to each phase line and the neutral line of the power system 10, and the second waveform correction unit 40b is a variable resistive unit that is connected to each phase line and the neutral line of the power line connected to the load. With the first and the second waveform correction units 40a and 40b, that is, the variable resistive units, the critical impedance of the power system is reduced, thereby stabilizing power to be applied and preventing the overload in the load. Further, the first and second waveform correction units 40a and 40b improve such that the signal waveforms on the power system and the load are close to sinusoidal signals.
[17] Meanwhile, the hybrid filter circuit unit 50 has a passive filter and an active filter, which is shown in a circuit diagram of FlG. 3.
[18] As shown in FlG. 3, one end of each of reactors Ll to L4 of the passive filter unit
60 according to this embodiment is connected in parallel with each phase line and a neutral line N between the power system 10 and the load 30, the other end of each of the reactors Ll to L4 is connected in series to one of each of capacitors Cl to C4, and the other end of each of the capacitors Cl to C4 is connected in series to an end of each of the reactors L5 to L8 of the active filter unit 80. That is, one end of each of the reactors Ll to L4 of the passive filter unit 60 is connected in parallel to the neutral line N as well as each phase line between the power system and the load, such that the harmonic current applied from the load through each phase line and the neutral line of the power system can be completely cut off.
[19] According to the configuration of the hybrid filter circuit unit, in this embodiment, a matching transformer 70 is connected between the passive filter unit 60 and the active filter unit 80 so as to match different impedance characteristics between the passive filter unit and the active filter unit. [20] In the power system according to this embodiment having the above-described configuration, the operation for reducing a harmonic current generated from the load and applied to the power system when power is applied to the load through the power line will be described with reference to the circuit diagram of FlG. 3.
[21] As shown in FlG. 3, if alternating current power is applied from the power system
10 having a three-phase multi-wire connection structure to the load 30, the operation on the load 30 is performed. Here, this embodiment suggests the hybrid filter circuit unit, that is, the circuit configuration of the passive filter unit 60 and the active filter unit 80 connected in series, thereby cuttng off the harmonic current component, so as to cut off a harmonic current component to be generated on the load 30 and applied to the power system 10.
[22] That is, in the hybrid filter circuit unit, the passive filter unit 60 primarily filters the harmonic current component applied from the load 30 to the power system 10. The primarily filtered harmonic current component is secondarily filtered through the circuit configuration of the active filter unit 80 that is connected in series to the passive filter unit 60. Meanwhile, in this embodiment, with the matching transformer 70 that is connected in series between the passive filter unit 60 and the active filter unit 80, different impedance characteristics between the passive filter unit 60 and the active filter unit 80 can be adjusted.
[23] As described above, in this embodiment, since most of the harmonic current components generated on the load 30 and applied through each phase line and the neutral line of the power line flow into the passive filter unit 60, the active filter unit 80 can filter the harmonic current component with small capacity. Then, the harmonic component flowing from the load 30 into each phase line and the neutral line of the power system 10 can be completely cut off. That is because the active filter unit 80 is an element for complementing the passive filter unit 60, and thus, the filter capacity can be small. Therefore, harmonic current applied to the power system can be cut off with small capacity.
[24] In this embodiment, as described above, the variable resistive units 40a (Rl to R4) are respectively connected to the phase lines and the neutral line of the power system 10, and the variable resistive units 40b (Rl' to R4') are respectively connected to the phase lines and the neutral line of the power line connected to the load 30. With the variable resistive units 40a and 40b, the critical impedance of the power system 10 is reduced, and thus the applied power is stabilized. In addition, the signal waveform is improved close to a sine wave. Further, an overload is prevented and the signal waveform is improved close to a sinusoidal signal in the load 30.
[25] As such, according to the invention, in order to reduce the harmonic current component applied from the load to the power system, the passive filter that is connected in parallel with each phase line and the neutral line between the power system and the load, and the active filter that is connected in series to the passive filter are provided. In addition, the variable resistive units are respectively provided in the power system and the load so as to stabilize power in the power system and the load, to prevent an overload, and to apply the signal waveform close to a sinusoidal signal. [26] In analyzing the technical scope of the invention, it should be understood that the above embodiment is not limitative. That is, the technical scope of the invention is defined by the appended claims.

Claims

Claims
[1] A hybrid type harmonic reduction apparatus that reduces harmonics on a power line, comprising: a power system that supplies power; a load that is supplied with power applied from the power system; a hybrid filter circuit unit that is connected to each phase line and a neutral line in order to reduce harmonics that are generated in the load and applied to the power system, comprising an active filter unit and a passive filter unit connected in parallel with each phase line and the neutral line between the power system and the load, the active filter unit and the passive filter unit being connected in series; a first waveform correction unit that is connected between the power system and the hybrid filter circuit unit so as to adjust the critical impedance of the power system and to correct the signal waveform; and a second waveform correction unit that is connected between the hybrid filter circuit unit and the load so as to prevent an overload and to correct the signal waveform.
[2] The hybrid type harmonic reduction apparatus as set forth in claim 1, wherein said power applied from the power system to the load is alternating current power.
[3] The hybrid type harmonic reduction apparatus as set forth in claim 1, wherein the connection structure of the power system is a three-phase multi-wire connection structure.
[4] The hybrid type harmonic reduction apparatus as set forth in claim 1, wherein, in the hybrid filter circuit unit, one end of each reactor of the passive filter unit is connected in parallel with each phase line and the neutral line between the power system and the load, the other end of each reactor is connected in series to one end of each capacitor, and the other end of each capacitor is connected in series to an end of each reactor of the active filter unit.
[5] The hybrid type harmonic reduction apparatus as set forth in claim 4, further comprising: a matching transformer that is connected between the passive filter unit and the active filter unit in order to match the different impedance characteristics between the passive filter unit and the active filter unit.
[6] The hybrid type harmonic reduction apparatus as set forth in claim 1, wherein the first waveform correction unit is a variable resistive unit that is connected to each phase line and the neutral line of the power system. [7] The hybrid type harmonic reduction apparatus as set forth in claim 1, wherein the second waveform correction unit is a variable resistive unit that is connected to each phase line and the neutral line of the load.
PCT/KR2006/005799 2005-12-28 2006-12-28 An apparatus of hybrid filter type for reduction of harmonic frequency WO2007075057A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BRPI0622172-6A BRPI0622172A2 (en) 2005-12-28 2006-12-28 hybrid type filter apparatus for harmonic frequency reduction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050131631A KR100659984B1 (en) 2005-12-28 2005-12-28 An apparatus of hybrid filter type for reduction of harmonic frequency
KR10-2005-0131631 2005-12-28

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BR (1) BRPI0622172A2 (en)
WO (1) WO2007075057A1 (en)

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CN102255326A (en) * 2011-07-04 2011-11-23 胡继炜 Method and system for balancing active power loads
FR2969848A1 (en) * 2010-12-28 2012-06-29 Lorraine Inst Nat Polytech REACTIVE ENERGY COMPENSATION CIRCUIT AND METHOD IMPLEMENTED IN SUCH A CIRCUIT
ES2387918A1 (en) * 2010-11-10 2012-10-03 Universidad De Las Palmas De Gran Canaria Programmable compensator of harmonic, reactive and imbalanced currents for weak networks. (Machine-translation by Google Translate, not legally binding)

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WO2010011098A2 (en) * 2008-07-24 2010-01-28 (주)에너테크 Hybrid transformer with transformation and improved harmonics functions, unbalanced current, and a power supply system thereof
WO2010032957A2 (en) * 2008-09-17 2010-03-25 (주)에너테크 Power quality improvement device and power supply system
KR101573813B1 (en) * 2015-06-29 2015-12-02 박훈양 Low loss type hybrid transformer, and manufacturing method thereof

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WO2004036716A1 (en) * 2002-10-18 2004-04-29 C & A Electric Co., Ltd Active eliminating apparatus for harmonic component
US20050057949A1 (en) * 2003-09-17 2005-03-17 Kim Chan Ki 12th active filter capable of concurrently removing 11th and 13th harmonics
US20050253564A1 (en) * 2002-07-19 2005-11-17 Se-Wan Choi Active power filter apparatus with reduced va rating for neutral current suppression

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US20030149842A1 (en) * 2000-05-16 2003-08-07 Shin-Dug Kim Method for controling cache system comprising direct-mapped cache and fully-associative buffer
US20050253564A1 (en) * 2002-07-19 2005-11-17 Se-Wan Choi Active power filter apparatus with reduced va rating for neutral current suppression
WO2004036716A1 (en) * 2002-10-18 2004-04-29 C & A Electric Co., Ltd Active eliminating apparatus for harmonic component
US20050057949A1 (en) * 2003-09-17 2005-03-17 Kim Chan Ki 12th active filter capable of concurrently removing 11th and 13th harmonics

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2387918A1 (en) * 2010-11-10 2012-10-03 Universidad De Las Palmas De Gran Canaria Programmable compensator of harmonic, reactive and imbalanced currents for weak networks. (Machine-translation by Google Translate, not legally binding)
FR2969848A1 (en) * 2010-12-28 2012-06-29 Lorraine Inst Nat Polytech REACTIVE ENERGY COMPENSATION CIRCUIT AND METHOD IMPLEMENTED IN SUCH A CIRCUIT
WO2012089966A1 (en) * 2010-12-28 2012-07-05 Institut National Polytechnique De Lorraine Reactive power compensation circuit and a method of using such a circuit
CN102255326A (en) * 2011-07-04 2011-11-23 胡继炜 Method and system for balancing active power loads

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KR100659984B1 (en) 2006-12-22

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