WO2005022716A1 - The harmonic reduction apparatus which use the resonance of the zero-phase-sequence impedance - Google Patents

The harmonic reduction apparatus which use the resonance of the zero-phase-sequence impedance Download PDF

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Publication number
WO2005022716A1
WO2005022716A1 PCT/KR2003/002186 KR0302186W WO2005022716A1 WO 2005022716 A1 WO2005022716 A1 WO 2005022716A1 KR 0302186 W KR0302186 W KR 0302186W WO 2005022716 A1 WO2005022716 A1 WO 2005022716A1
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WIPO (PCT)
Prior art keywords
phase sequence
zero phase
electronic power
power system
neutral
Prior art date
Application number
PCT/KR2003/002186
Other languages
French (fr)
Inventor
Byung Ju Park
Original Assignee
Pq Tech Inc.
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.)
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Publication date
Priority claimed from KR1020030060230A external-priority patent/KR100435106B1/en
Application filed by Pq Tech Inc. filed Critical Pq Tech Inc.
Priority to AU2003273075A priority Critical patent/AU2003273075A1/en
Publication of WO2005022716A1 publication Critical patent/WO2005022716A1/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
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • Y02E40/30—Reactive power compensation
    • 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 harmonic reduction apparatus, which uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics.
  • zigzag transformer crossed coupling transformer
  • the object of the present invention uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics.
  • zigzag transformer crossed coupling transformer
  • Figure 1 is a view illustrating of reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current as already registered in the USPTO and KIPO according to the present invention.
  • Figure 2 is another view illustrating of reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current as already registered in the USPTO and KlPO according to the present invention.
  • Figure 3 is a connection view illustration of reduction apparatus of a high voltage electric according to the present invention.
  • Figure 4 is another connection view illustration of reduction apparatus of a high voltage electric according to the present invention.
  • Figure 5 is showing a graph of linear loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1.
  • Figure 6 is showing a graph of single-phase loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1.
  • Figure 7 is showing a graph of three-phase thyristor loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1.
  • Figure 8 is showing a graph of three-phase inverter loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1.
  • Figure 9 is showing a graph of neutral, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems.
  • Figure 10 is showing a graph of neutral after applying 50A frame between electronic power system and loads.
  • Figure 11 is showing a graph of power after applying 50A frame between electronic power system and loads.
  • Figure 12 is showing a graph of neutral frequency after applying 50A frame in high voltage electrical distribution systems to the present invention.
  • Figure 13 is showing a graph of power frequency after applying 50A frame in high voltage electrical distribution systems to the present invention.
  • Figure 14 is showing a graph of neutral frequency after applying 150A frame of the existing invention between electronic power system and loads.
  • Figure 15 is showing a graph of power frequency after applying 150A frame of the existing invention between electronic power system and loads.
  • Figure 16 is showing a graph of neutral frequency after applying for high voltage electrical distribution systems according to the present invention.
  • Figure 17 is showing a graph of power frequency after applying for high voltage electrical distribution systems according to the present invention.
  • a harmonic reduction apparatus of the present invention which uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load
  • a harmonic reduction apparatus of the present invention which uses a resonance of zero phase sequence, included branch of each winding wire (a, b, c) which is connected in parallel of each line (A, B, C) of a electronic power system (30), which is coiled in multiple of 2 coils in opposite direction of winding wire, using a resonance of zero phase sequence, using a crossed coupling transformer (zigzag transformer) (45) which send an electric current to neutral (N) of the electronic power system (30) from a load (50), neutral (N) is connected to the crossed coupling transformer (zigzag transformer) (45) in series and connected to the neutral (N) of electronic power system (30) in parallel, capacitor (42) which is depend
  • the harmonic reduction apparatus of the present invention which is connect to the capacitor (42) and the crossed coupling transformer (zigzag transformer) (45) in series for reducing an impedance and with respect to zero phase sequence harmonics, the reactor (41) has higher impedance than cross coupling transformer (zigzag transformer) (45), is variable the impedance based on type of load.
  • the crossed coupling transformer (zigzag transformer) (45) which is already opened the methods or best mode for carrying out the invention, thus it is excepting describing about unnecessary methods or best mode for carrying out the invention.
  • Figure 3 is a connection view illustration of reduction apparatus of a high voltage electric according to the present invention.
  • electronic power system (30) supplies electronic power to load (50) with having Y crossed coupling three-phase and four-wire, harmonic reduction apparatus (40) of the present invention consist of reactor (41), capacitor (42), and crossed coupling transformer (zigzag transformer) (45), which is connecting to neutral between electronic power system (30) and load (50) and each line (A, B, C) for reducing the zero phase sequence harmonics
  • harmonic reduction apparatus (40) of the present invention consist of reactor (41), capacitor (42), and crossed coupling transformer (zigzag transformer) (45), which is connecting to neutral between electronic power system (30) and load (50) and each line (A, B, C) for reducing the zero phase sequence harmonics
  • the preferred embodiments of the present invention will be described about reducing harmonics apparatus (40) with reference to the accompanying drawings Figure 3, If each winding line (a, b, c) of crossed coupling transformer (zigzag transformer) (45) is connected to each line (A, B, C) the electronic power system (30) in parallel, and the capacitor (42) is
  • reactor (41 ) which is connected to neutral (N) of the electronic power system (30), is including based on types of load, intercept from zero phase sequence harmonic, and zero phase sequence harmonic can be absorbed to the harmonic reduction apparatus of the present invention.
  • Figure 4 is another connection view illustration of reduction apparatus of a high voltage electric according to the present invention, in details as follows, If the capacitor (42, 43, 44) is connected to each line (A, B, C) of electronic power system (30) in parallel and to the crossed coupling transformer (zigzag transformer) (45) in series, then neutral (N) of the crossed coupling transformer (zigzag transformer) (45) is connected to neutral (N) of the electronic power system (30) in parallel, the capacitor (42, 43, 44) and resonance multiple line which is coiled on each leg of the crossed coupling transformer (zigzag transformer) (45) in series, which is using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current, thus this can be absorbed easily the crossed coupling transformer (zigzag transformer) (45).
  • a reactor (41 ) which is connected a neutral (N) of the electronic power system (30) in series with having value of impedance and including capacity of variable impedance based on types of load, intercept zero phase sequence harmonic from the electronic power system (30), and zero phase sequence harmonic can be absorbed to the harmonic reduction apparatus (40) of the present invention.
  • a harmonic reduction apparatus which is consisting of capacitor and resistance in parallel with reference to another view illustrating, Branch of each winding wire which is coiled with multiple line in opposite, in each line of the electronic power system in parallel, reducing zero phase sequence harmonic from the load (50), crossed coupling transformer (zigzag transformer) with neutral of the electronic power system (30) and neutral o f c rossed c oupling t ransformer ( zigzag t ransformer) o r c onnecting t o winding wire in series, neutral of the electronic power system and connecting to each line in parallel, fixed or variable of capacitor which is depend on capacity of electronic power and neutral of the crossed coupling transformer (zigzag transformer) or resistance with each winding wire in parallel and with connecting to neutral of the electronic and each line in series, this can be control to absorb and interrupt zero phase sequence harmonic from the electronic power system.
  • the present invention is including with the capacitor and resistance in parallel circuit, is connecting to the neutral of the crossed coupling transformer (zigzag transformer) or each winding wire in both series and parallel.
  • the preferred embodiments of the present invention will be described with reference to one another view illustrating, If the each winding wire (a, b, c) of the crossed coupling transformer (zigzag transformer) (45) is connecting to each line (A, B, C) of the electronic power system (30) in parallel, and the resistance (not drawing) and capacitor (42) in parallel circuit is connecting to the neutral (N) of the crossed coupling transformer (zigzag transformer) (45) in series, and connecting to neutral (N) of the electronic power system (30), then the capacitor (42) which is consisting of the crossed coupling t ransformer (zigzag transformer) (45) with multiple coils (not drawing) and the resistance (not drawing) in parallel, a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current
  • the reactor (41 ) which is connecting to the neutral (N) of the electronic power system (30) in series with having a high impedance value based on types of load (50), intercept zero phase sequence harmonics current including ability of variableness from the electronic power system, and also reducing the zero phase sequence harmonics current controls a harmonic reduction apparatus of the present invention.
  • Table 1 the result of testing for better view illustrating.
  • figure 5 through Figure 17 is showing the result of simulation in the same condition as shown in Table 1. [Table 1]
  • Figure 5 through Figure 8 is showing the result of simulation about linear load, single Phase, 3P SCR, 3P Diode in the same condition as shown in Table 1.
  • Figure 6 it is showing the ordinary electronic current frequency of a great deal with zero sequence harmonic currents about single- phase loads.
  • Figure 9 is showing a graph of neutral of a great deal with zero sequence harmonic currents in high voltage electrical distribution systems.
  • Figure 10 and Figure 11 are showing a graph of neutral and electronic power after applying 50A frame between electronic power system and loads by the condition of Table 1. As shown graph, absorbing rate is approximately 26.5% of zero sequence harmonic current.
  • Figure 12 and Figure 13 are showing a graph of neutral frequency and power frequency after applying 50A frame in high voltage electrical distribution systems to the present invention by the condition of Table 1.
  • Figure 14 and Figure 15 are showing a graph of neutral frequency and power frequency after applying 150A f rame of t he existing invention b etween electronic power system and loads by the condition of Table 1. As shown graph, it is effective absorbing approximately 46.9% of neutral of zero sequence harmonic current.
  • Figure 16 and Figure 17 are showing a graph of neutral frequency and power frequency after applying for high voltage electrical distribution systems according to the present invention by the condition of Table 1.
  • a harmonic reduction apparatus of the present invention which uses a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three- phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics, that is possible dramatically to reduce an electronic power energy consumption by the offset each other zero harmonic currents, existing methods are compare to the present invention, not only additional supplies for supplying normal electronic power in each current loads but also high power costs for coating more thickly.
  • a harmonic reduction apparatus of the present invention is provided effectively to overcome the problems that low generating of an electronic generator, low rate of reverse, overheating of transformer, and loss of electronic power by the offset of zero harmonic currents.

Abstract

The present invention relates to a harmonic reduction apparatus, which uses a resonance zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a electronic power system, an reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics.

Description

The harmonic reduction apparatus which use the
resonance of the ZERO-PHASE-SEQUENCE IMPEDANCE
Technical Field The present invention relates to a harmonic reduction apparatus, which uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics.
BACKGROUND ART Recently, there was increased rapidly lots of electronic products around us. There was a problem. The cable was overheating because this zero sequence harmonic was high voltage e lectric through n eutral line. This was the cause of fire for overheating of the high voltage electric. The effect of single-phase, non-linear loads, as sources of positive, negative and third order, zero p hase s equence h armonics c urrents i n I ow v oltage e lectrical d istribution systems, was discussed. In fact, there are so many difficult problems that hundreds, if not thousands, of theses, papers, articles and case studies have been published on this subject. The high voltage electric through neutral, overheating of electronic transformer, a drop in efficiency of electronic generator, a drop in efficiency of power-factor, increasing of losing electronic power, and induction obstacle ware the cause of an unexpected obstacle which was seriously dangerous by such as fire. Various traditional methods for dealing with these harmonic currents are outlined and their shortcomings identified. As Figure 1 to overcome the above problems, a method of reducing an impedance using a crossed coupling transformer (zigzag transformer) had been on this subject (USP Registration No. 5,576,942). According to the method, reducing an impedance using a crossed coupling transformer (zigzag transformer) (5), and zero phase sequence harmonics currents were increased efficiency of reducing zero phase sequence harmonics currents using a neutral line connected with reactor(4). Also, as shown Figure 2, a method for disconnecting to power system if more than three-phase multiple line for supplying an alternating current to a load, reactor (L1 , L2, L 3) with a high impedance in each of lines between a power system(20) and a crossed coupling transformer (zigzag transformer) (21 ) (Korea International Patent Office(KIPO) Registration No. 10-0364513). However, according to the method, rapidly high and low voltage was happened because each reactor had a high impedance. This was a problem of lowering an alternating current to a load. As relating to the above methods, USP Registration No. 5,790,356 and USP Registration No. 5,406,437, and so on had been registered in the United State.
DISCLOSURE OF INVENTION Accordingly, Alternative methods, which provide harmonic current reduction, and power quality improvement, are presented. Results of the application of alternative devices in typical environments are given. It is an object of the present invention to overcome the above problems encountered in the conventional art. As mentioned above, the object of the present invention of a harmonic reduction apparatus, which uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics.
Brief Description of the Drawings The present invention will become better understand with reference to accompanying drawings which are given only by way of illustration and thus are not limitative of the present invention, wherein; Figure 1 is a view illustrating of reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current as already registered in the USPTO and KIPO according to the present invention. Figure 2 is another view illustrating of reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current as already registered in the USPTO and KlPO according to the present invention. Figure 3 is a connection view illustration of reduction apparatus of a high voltage electric according to the present invention. Figure 4 is another connection view illustration of reduction apparatus of a high voltage electric according to the present invention. Figure 5 is showing a graph of linear loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1. Figure 6 is showing a graph of single-phase loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1. Figure 7 is showing a graph of three-phase thyristor loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1. Figure 8 is showing a graph of three-phase inverter loads, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems in Figure 1. Figure 9 is showing a graph of neutral, as sources of positive, negative and third order, zero sequence harmonic currents in high voltage electrical distribution systems. Figure 10 is showing a graph of neutral after applying 50A frame between electronic power system and loads. Figure 11 is showing a graph of power after applying 50A frame between electronic power system and loads. Figure 12 is showing a graph of neutral frequency after applying 50A frame in high voltage electrical distribution systems to the present invention. Figure 13 is showing a graph of power frequency after applying 50A frame in high voltage electrical distribution systems to the present invention. Figure 14 is showing a graph of neutral frequency after applying 150A frame of the existing invention between electronic power system and loads. Figure 15 is showing a graph of power frequency after applying 150A frame of the existing invention between electronic power system and loads. Figure 16 is showing a graph of neutral frequency after applying for high voltage electrical distribution systems according to the present invention. Figure 17 is showing a graph of power frequency after applying for high voltage electrical distribution systems according to the present invention.
Best Mode for Carrying Out the Invention According to the present invention, in a harmonic reduction apparatus, which uses a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, A harmonic reduction apparatus of the present invention, which uses a resonance of zero phase sequence, included branch of each winding wire (a, b, c) which is connected in parallel of each line (A, B, C) of a electronic power system (30), which is coiled in multiple of 2 coils in opposite direction of winding wire, using a resonance of zero phase sequence, using a crossed coupling transformer (zigzag transformer) (45) which send an electric current to neutral (N) of the electronic power system (30) from a load (50), neutral (N) is connected to the crossed coupling transformer (zigzag transformer) (45) in series and connected to the neutral (N) of electronic power system (30) in parallel, capacitor (42) which is depend on capacity of electronic power, reactor (41) which breaks zero phase sequence harmonics current from electronic power system (30). The harmonic reduction apparatus of the present invention, which is connect to the capacitor (42) and the crossed coupling transformer (zigzag transformer) (45) in series for reducing an impedance and with respect to zero phase sequence harmonics, the reactor (41) has higher impedance than cross coupling transformer (zigzag transformer) (45), is variable the impedance based on type of load. The preferred embodiments of the present invention will be described with reference to the accompanying drawings. In interpretation of the present invention, the crossed coupling transformer (zigzag transformer) (45) which is already opened the methods or best mode for carrying out the invention, thus it is excepting describing about unnecessary methods or best mode for carrying out the invention. Figure 3 is a connection view illustration of reduction apparatus of a high voltage electric according to the present invention. As reference to Figure 3 of the present invention, electronic power system (30) supplies electronic power to load (50) with having Y crossed coupling three-phase and four-wire, harmonic reduction apparatus (40) of the present invention consist of reactor (41), capacitor (42), and crossed coupling transformer (zigzag transformer) (45), which is connecting to neutral between electronic power system (30) and load (50) and each line (A, B, C) for reducing the zero phase sequence harmonics The preferred embodiments of the present invention will be described about reducing harmonics apparatus (40) with reference to the accompanying drawings Figure 3, If each winding line (a, b, c) of crossed coupling transformer (zigzag transformer) (45) is connected to each line (A, B, C) the electronic power system (30) in parallel, and the capacitor (42) is connected to neutral (N) in series, the electronic power system (30) is connected to neutral in parallel, the crossed coupling transformer (zigzag transformer) (45) with multiple coils which is coiled on leg (This is not drawing in the present invention) and capacitor (42) in series, it can make reduce am impedance, and also zero phase sequence impedance in the load (50) can make easily absorb to the crossed coupling transformer (zigzag transformer) (45). In addition, reactor (41 ) which is connected to neutral (N) of the electronic power system (30), is including based on types of load, intercept from zero phase sequence harmonic, and zero phase sequence harmonic can be absorbed to the harmonic reduction apparatus of the present invention. Figure 4 is another connection view illustration of reduction apparatus of a high voltage electric according to the present invention, in details as follows, If the capacitor (42, 43, 44) is connected to each line (A, B, C) of electronic power system (30) in parallel and to the crossed coupling transformer (zigzag transformer) (45) in series, then neutral (N) of the crossed coupling transformer (zigzag transformer) (45) is connected to neutral (N) of the electronic power system (30) in parallel, the capacitor (42, 43, 44) and resonance multiple line which is coiled on each leg of the crossed coupling transformer (zigzag transformer) (45) in series, which is using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current, thus this can be absorbed easily the crossed coupling transformer (zigzag transformer) (45). Moreover, a reactor (41 ) which is connected a neutral (N) of the electronic power system (30) in series with having value of impedance and including capacity of variable impedance based on types of load, intercept zero phase sequence harmonic from the electronic power system (30), and zero phase sequence harmonic can be absorbed to the harmonic reduction apparatus (40) of the present invention. The preferred embodiments of the present invention will be described about a harmonic reduction apparatus which is consisting of capacitor and resistance in parallel with reference to another view illustrating, Branch of each winding wire which is coiled with multiple line in opposite, in each line of the electronic power system in parallel, reducing zero phase sequence harmonic from the load (50), crossed coupling transformer (zigzag transformer) with neutral of the electronic power system (30) and neutral o f c rossed c oupling t ransformer ( zigzag t ransformer) o r c onnecting t o winding wire in series, neutral of the electronic power system and connecting to each line in parallel, fixed or variable of capacitor which is depend on capacity of electronic power and neutral of the crossed coupling transformer (zigzag transformer) or resistance with each winding wire in parallel and with connecting to neutral of the electronic and each line in series, this can be control to absorb and interrupt zero phase sequence harmonic from the electronic power system. The present invention is including with the capacitor and resistance in parallel circuit, is connecting to the neutral of the crossed coupling transformer (zigzag transformer) or each winding wire in both series and parallel. The preferred embodiments of the present invention will be described with reference to one another view illustrating, If the each winding wire (a, b, c) of the crossed coupling transformer (zigzag transformer) (45) is connecting to each line (A, B, C) of the electronic power system (30) in parallel, and the resistance (not drawing) and capacitor (42) in parallel circuit is connecting to the neutral (N) of the crossed coupling transformer (zigzag transformer) (45) in series, and connecting to neutral (N) of the electronic power system (30), then the capacitor (42) which is consisting of the crossed coupling t ransformer (zigzag transformer) (45) with multiple coils (not drawing) and the resistance (not drawing) in parallel, a resonance of zero phase sequence impedance for reducing a harmonics using a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current, the capacitor and the resistance in parallel which means protecting and reducing to reach the time of steady state of zero phase harmonic apparatus (40). Besides, the reactor (41 ) which is connecting to the neutral (N) of the electronic power system (30) in series with having a high impedance value based on types of load (50), intercept zero phase sequence harmonics current including ability of variableness from the electronic power system, and also reducing the zero phase sequence harmonics current controls a harmonic reduction apparatus of the present invention. As reference to below Table 1 , the result of testing for better view illustrating. As figure 5 through Figure 17 is showing the result of simulation in the same condition as shown in Table 1. [Table 1]
Type of load | Current A I % | kVA [ Applying load
Figure imgf000011_0001
As Figure 5 through Figure 8 is showing the result of simulation about linear load, single Phase, 3P SCR, 3P Diode in the same condition as shown in Table 1. In case of Figure 6, it is showing the ordinary electronic current frequency of a great deal with zero sequence harmonic currents about single- phase loads. Figure 9 is showing a graph of neutral of a great deal with zero sequence harmonic currents in high voltage electrical distribution systems. Figure 10 and Figure 11 are showing a graph of neutral and electronic power after applying 50A frame between electronic power system and loads by the condition of Table 1. As shown graph, absorbing rate is approximately 26.5% of zero sequence harmonic current. Figure 12 and Figure 13 are showing a graph of neutral frequency and power frequency after applying 50A frame in high voltage electrical distribution systems to the present invention by the condition of Table 1. As shown graph, it is a great effective to absorb approximately 90% of zero sequence harmonic current after applying a harmonic reduction apparatus of the present invention, is better effective than traditional methods for a harmonic reduction apparatus. Figure 14 and Figure 15 are showing a graph of neutral frequency and power frequency after applying 150A f rame of t he existing invention b etween electronic power system and loads by the condition of Table 1. As shown graph, it is effective absorbing approximately 46.9% of neutral of zero sequence harmonic current. Figure 16 and Figure 17 are showing a graph of neutral frequency and power frequency after applying for high voltage electrical distribution systems according to the present invention by the condition of Table 1. As shown graph, it is a great effective to absorb approximately 90% of zero sequence harmonic current after applying a harmonic reduction apparatus of the present invention, is better effective than typical methods for a harmonic reduction apparatus. The present invention is not limited to the above embodiment. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are mot limited by any of the details of the foregoing description, unless otherwise specified, but rather should be constructed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
[Table 2]
Figure imgf000012_0001
Figure imgf000013_0001
As above table 2, a harmonic reduction apparatus of the present invention, which uses a resonance of zero phase sequence impedance with respect to zero phase sequence harmonics current which occurs in a three- phase multiple line for supplying an alternating current to a load, and in particular to an apparatus for reducing an impedance using a crossed coupling transformer (zigzag transformer) and a capacitor with respect to zero phase sequence harmonics generated from the side of a load and include into a power system, and reducing zero phase sequence harmonics based on the crossed coupling transformer (zigzag transformer) by implementing an easier induction of the zero phase sequence harmonics, that is possible dramatically to reduce an electronic power energy consumption by the offset each other zero harmonic currents, existing methods are compare to the present invention, not only additional supplies for supplying normal electronic power in each current loads but also high power costs for coating more thickly. Results show that an active-type harmonic-elimination circuit, built into the common electronic equipment switch-mode-power supply, is cost-effective based on energy loss considerations alone. In addition, a harmonic reduction apparatus of the present invention is provided effectively to overcome the problems that low generating of an electronic generator, low rate of reverse, overheating of transformer, and loss of electronic power by the offset of zero harmonic currents. Moreover, a h armonic reduction a pparatus of the p resent i nvention i s protected effectively t ransient p henomena of switch-mode-power to reduce to reach the time of steady state by capacitor and resistance in parallel.

Claims

WHAT IS CLAIMED IS:
1. In a harmonic reduction apparatus using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load for alternating current power supply in loads, the harmonic reduction apparatus comprising: a crossed coupling transformer (zigzag transformer) which means sending electric currents to neutral of the electronic power system from a load which is reduced zero harmonic current, each winding wire connected to each line of an electronic power system in parallel, is coiled with multiple coils in branch circuit, is coiled the crossed coupling to opposite direction; a capacitor which means fixable or variable as a capacity of electronic power generator, is connected to the neutral of the crossed coupling transformer (zigzag transformer) in series and connected to the neutral of the electronic power system in parallel; a reactor which means to intercept and absorb zero phase sequence harmonic which is from the electronic power system connected to neutral of the electronic power system in series; comprising a harmonic reduction apparatus means using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current.
2. The harmonic reduction apparatus as in claim 1 , wherein using the resonance of zero phase sequence impedance is including optimizing zero phase sequence impedance by the offset with zero phase sequence impedance of the crossed coupling transformer (zigzag transformer) because the capacitor is being smaller in zero sequence frequency.
3. The harmonic reduction apparatus as in claim 1 , wherein using the resonance of zero phase sequence impedance is including reducing zero phase sequence harmonics and implementing an easier induction of the zero phase sequence harmonics because the crossed coupling transformer (zigzag transformer) and the capacitor constitute a resonance in series.
4. The harmonic reduction apparatus as in claim 1 , wherein using the resonance of zero phase sequence impedance is including reactor in which has more impedance than the crossed coupling transformer (zigzag transformer), and can be variable the impedance depend on types of loads.
5. In using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, the harmonic reduction apparatus comprising: a capacitor comprises fixable or variable depend on a necessary of electronic power capacity, connected to each winding wire of the crossed coupling transformer (zigzag transformer) in series, connected to each line of the electronic power system in parallel; a crossed coupling transformer (zigzag transformer) comprises sending electric currents to neutral of the electronic power system from a load which is reduced zero harmonic current, in which each winding wire connected to each line of an electronic power system in parallel, is coiled with multiple coils in branch circuit, is coiled the crossed coupling to opposite direction; a reactor comprises to intercept and absorb zero phase sequence harmonic which is from the electronic power system connected to neutral of the electronic power system in series; including a harmonic reduction apparatus means using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current.
6. In using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current which occurs in a three-phase multiple line for supplying an alternating current to a load, a harmonic reduction apparatus comprising: a crossed coupling transformer (zigzag transformer) comprises sending electric currents to neutral of a electronic power system from a load which is reduced zero harmonic current, in which each winding wire connected to each line of the e lectronic power system in parallel, is coiled with multiple coils in branch circuit, is coiled the crossed coupling to opposite direction; a capacitor comprises fixable or variable as a capacity of electronic power generator, in which is connected to the neutral of the crossed coupling transformer (zigzag transformer) in series and connected to the neutral of the electronic power system in parallel; a resistance in which is connected to the neutral of the crossed coupling transformer (zigzag transformer) or each winding wire in series, or each line and neutral of the electronic power system in parallel; a reactor comprises to intercept and absorb zero phase sequence harmonic which is from the electronic power system connected to neutral of the electronic power system in series; including a harmonic reduction apparatus means using a resonance of zero phase sequence impedance with respect to a zero phase sequence harmonics current.
7. The harmonic reduction apparatus as in claim 6, wherein using the resonance of zero phase sequence impedance is including the capacitor and the resistance in which is a parallel circuit, connected to the neutral of the crossed coupling transformer (zigzag transformer) or each winding wire in series, or each line and the neutral of the electronic power system.
PCT/KR2003/002186 2003-08-29 2003-10-18 The harmonic reduction apparatus which use the resonance of the zero-phase-sequence impedance WO2005022716A1 (en)

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AU2003273075A AU2003273075A1 (en) 2003-08-29 2003-10-18 The harmonic reduction apparatus which use the resonance of the zero-phase-sequence impedance

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KR1020030060230A KR100435106B1 (en) 2003-08-21 2003-08-29 The harmonic reduction apparatus which use the resonance of the ZERO-PHARSE-SEQUENCE IMPEDANCE
KR10-2003-0060230 2003-08-29

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7432699B2 (en) 2003-06-27 2008-10-07 Forskarpatent I Syd Ab Transformer with protection against direct current magnetization caused by zero sequence current
WO2008141963A2 (en) * 2007-05-18 2008-11-27 Abb Technology Ag Static var compensator apparatus
US7489485B2 (en) * 2004-05-10 2009-02-10 Forskarpatent I Syd Ab Method and equipment for the protection of power systems against geomagnetically induced currents
US8848403B2 (en) 2011-06-10 2014-09-30 Abb Technology Ag Compensation system for medium or high voltage applications

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JPH06165381A (en) * 1992-11-17 1994-06-10 Nissin Electric Co Ltd Harmonic filter
US5656924A (en) * 1995-09-27 1997-08-12 Schott Power Systems Inc. System and method for providing harmonic currents to a harmonic generating load connected to a power system
KR200229449Y1 (en) * 2000-12-29 2001-07-19 세빛 주식회사 Hamonic power filter apparatus
KR100364513B1 (en) * 2001-06-30 2002-12-12 (주) 피에스디테크 Apparatus for reducing the harmonic component in the power line

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH06165381A (en) * 1992-11-17 1994-06-10 Nissin Electric Co Ltd Harmonic filter
US5656924A (en) * 1995-09-27 1997-08-12 Schott Power Systems Inc. System and method for providing harmonic currents to a harmonic generating load connected to a power system
KR200229449Y1 (en) * 2000-12-29 2001-07-19 세빛 주식회사 Hamonic power filter apparatus
KR100364513B1 (en) * 2001-06-30 2002-12-12 (주) 피에스디테크 Apparatus for reducing the harmonic component in the power line

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7432699B2 (en) 2003-06-27 2008-10-07 Forskarpatent I Syd Ab Transformer with protection against direct current magnetization caused by zero sequence current
US7489485B2 (en) * 2004-05-10 2009-02-10 Forskarpatent I Syd Ab Method and equipment for the protection of power systems against geomagnetically induced currents
WO2008141963A2 (en) * 2007-05-18 2008-11-27 Abb Technology Ag Static var compensator apparatus
WO2008141963A3 (en) * 2007-05-18 2009-01-29 Abb Technology Ag Static var compensator apparatus
US7986132B2 (en) 2007-05-18 2011-07-26 Abb Technology Ag Static var compensator apparatus
US8400119B2 (en) 2007-05-18 2013-03-19 Abb Technology Ag Static var compensator apparatus
US8519679B2 (en) 2007-05-18 2013-08-27 Abb Technology Ag Static var compensator apparatus
US8848403B2 (en) 2011-06-10 2014-09-30 Abb Technology Ag Compensation system for medium or high voltage applications

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