JPH07135735A - Active filter device - Google Patents
Active filter deviceInfo
- Publication number
- JPH07135735A JPH07135735A JP5279309A JP27930993A JPH07135735A JP H07135735 A JPH07135735 A JP H07135735A JP 5279309 A JP5279309 A JP 5279309A JP 27930993 A JP27930993 A JP 27930993A JP H07135735 A JPH07135735 A JP H07135735A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- transformer
- phase inverter
- zero
- circuit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、３相４線式回線の中性
線を流れる零相高調波成分を補償するためのアクティブ
フィルタ装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active filter device for compensating for zero-phase harmonic components flowing in a neutral line of a three-phase four-wire system.
【０００２】[0002]
【従来の技術】負荷に電力を供給するため、図４ら示す
ような３相４線式配電線が採用されることがある。この
場合、負荷がパーソナルコンピュータ、テレビ、ＯＡ
（オフィスオートメーション）機器等の高調波を発生し
やすいものであると、各相の負荷が平衡していても負荷
から発生する零相高調波成分電流が、３相４線供給用変
圧器の中性線Ｎに、電線の定格を超えて多量に流れる。2. Description of the Related Art In order to supply electric power to a load, a three-phase four-wire type distribution line as shown in FIG. 4 may be adopted. In this case, the load is personal computer, TV, OA
(Office automation) If it is easy to generate harmonics in equipment, etc., even if the load of each phase is balanced, the zero-phase harmonic component current generated from the load will be in the 3-phase 4-wire supply transformer. A large amount of current flows on the property wire N, exceeding the rating of the wire.
【０００３】従来では、中性線Ｎを流れる高調波成分を
補償するため、アクティブフィルタを、各線Ａ，Ｂ，Ｃ
と中性線Ｎとの間に配置していた。このアクティブフィ
ルタは、図５に示すように、各線Ａ，Ｂ，Ｃ及び中性線
Ｎに３相絶縁変圧器の１次側をつなぎ、同変圧器の２次
側を単相インバータにそれぞれつないだもので、負荷に
流れる高調波電流ｉlA，ｉlB，ｉlCを変流器ＣＴ及びバ
ンドパスフィルタＢＰＦにより検出して単相インバータ
を高速電流制御することにより、系統電流ｉSA，ｉSB，
ｉSCと等しい大きさと逆の位相を持つ補償電流ｉAf，ｉ
Bf，ｉCfを発生して、高調波電流ｉlA，ｉlB，ｉlCを抑
制するものである。Conventionally, in order to compensate the harmonic component flowing through the neutral line N, an active filter is provided for each line A, B, C.
And the neutral line N. As shown in FIG. 5, this active filter connects the primary side of a three-phase insulating transformer to each line A, B, C and the neutral line N, and connects the secondary side of the transformer to a single-phase inverter. it intended, harmonic current i lA flowing through the load, i lB, by high-speed current control single-phase inverter are detected by i lC a current transformer CT and a band-pass filter BPF, the system current i SA, i SB ，
Compensation currents i Af , i having the same magnitude and opposite phase as i SC
Bf, generates a i Cf, is to suppress harmonic current i lA, i lB, the i lC.
【０００４】[0004]
【発明が解決しようとする課題】前記アクティブフィル
タの構成によると、単相インバータを３つ必要とするた
め、構成が大きくなってしまう。また、変圧器及び単相
インバータに基本波電圧が加わるため、それらの容量を
補償に必要な容量よりも大きくしなければならず、また
運転損失も大きくなる。According to the structure of the active filter, three single-phase inverters are required, so that the structure becomes large. Further, since the fundamental wave voltage is applied to the transformer and the single-phase inverter, their capacities must be made larger than the capacities required for compensation, and the operating loss becomes large.
【０００５】したがって、中性線Ｎのケーブル容量を減
らしたいのでアクティブフィルタを負荷の近くへ分散配
置したいという要求があっても、アクティブフィルタ自
体をコンパクト軽量に構成できないため、要求に応えら
れなかったという問題がある。そこで、本発明は、上述
の技術的課題を解決し、単相インバータの個数を減ら
し、変圧器の容量も小さくて済むコンパクトで軽量なア
クティブフィルタ装置を提供することを目的とする。Therefore, even if there is a demand to disperse the active filter near the load in order to reduce the cable capacity of the neutral wire N, the active filter itself cannot be made compact and lightweight, so that the demand cannot be met. There is a problem. Therefore, it is an object of the present invention to solve the above-mentioned technical problems and to provide a compact and lightweight active filter device in which the number of single-phase inverters is reduced and the capacity of a transformer is small.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
めの請求項１記載のアクティブフィルタ装置は、２次側
にΔ結線、１次側に中性点付きＹ結線を有する３相４線
式変圧器を用意し、その変圧器の１次側Ｙ結線を３相の
各相に接続するとともに、この変圧器の零相回路に単相
インバータを接続し、負荷電流を検出する回路と、検出
された負荷電流から所定の高調波電流を取り出す回路
と、この高調波電流の零相成分を取り出す回路とを設
け、前記取り出された零相成分を前記単相インバータに
供給し、単相インバータから３相４線式回線に補償電流
を流すようにしたものである。The active filter device according to claim 1 for achieving the above object is a three-phase four-wire having a Δ connection on the secondary side and a Y connection with a neutral point on the primary side. A type transformer is prepared, the primary side Y connection of the transformer is connected to each of the three phases, and a single-phase inverter is connected to the zero-phase circuit of this transformer, and a circuit for detecting a load current, A circuit for extracting a predetermined harmonic current from the detected load current and a circuit for extracting a zero-phase component of this harmonic current are provided, and the extracted zero-phase component is supplied to the single-phase inverter, and a single-phase inverter is provided. The compensating current is made to flow through the 3-phase 4-wire line.
【０００７】[0007]
【作用】前記アクティブフィルタ装置によれば、負荷電
流の所定の高調波成分を検出して、その高調波成分を制
御電流として前記単相インバータに供給する。そして、
単相インバータから変圧器の零相回路を通して補償電流
を注入することができる。According to the active filter device, a predetermined harmonic component of the load current is detected and the harmonic component is supplied to the single-phase inverter as a control current. And
The compensation current can be injected from the single-phase inverter through the zero-phase circuit of the transformer.
【０００８】前記アクティブフィルタ装置では、変圧器
の零相回路に単相インバータを接続しているので、単相
インバータには、基本波電圧は加わらない。したがっ
て、単相インバータの容量は最低限補償に必要な容量に
止めることができ、単相インバータ及び変圧器の小型化
を図ることができる。In the active filter device, since the single-phase inverter is connected to the zero-phase circuit of the transformer, the fundamental wave voltage is not applied to the single-phase inverter. Therefore, the capacity of the single-phase inverter can be limited to the capacity necessary for the minimum compensation, and the size of the single-phase inverter and the transformer can be reduced.
【０００９】[0009]
【実施例】以下実施例を示す添付図面によって詳細に説
明する。図１は、本発明のアクティブフィルタ装置を３
相４線式配電線に適用した構成を示す図であって、アク
ティブフィルタ装置１は、２次側にΔ結線、１次側に中
性点付きＹ結線を有する３相４線式フィルタ変圧器Ｔrh
を設け、その１次側中性点ＮF と、中性線Ｎとの間に単
相インバータ１１を接続している。アクティブフィルタ
装置１はさらに、単相インバータ１１の制御をするパル
ス回路１２と、単相インバータ１１から中性線Ｎに流れ
る電流の３次の高調波成分を取り出すバンドパスフィル
タ１３を備えている。Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 1 shows an active filter device 3 of the present invention.
FIG. 1 is a diagram showing a configuration applied to a phase 4-wire type distribution line, wherein an active filter device 1 is a 3-phase 4-wire type filter transformer having a Δ connection on a secondary side and a Y connection with a neutral point on a primary side. T rh
Is provided, and the single-phase inverter 11 is connected between the primary side neutral point N F and the neutral line N. The active filter device 1 further includes a pulse circuit 12 that controls the single-phase inverter 11, and a bandpass filter 13 that extracts the third harmonic component of the current flowing from the single-phase inverter 11 to the neutral line N.
【００１０】一方、負荷に流れる各相電流は、変流器Ｃ
Ｔによって検出され、混合回路２により混合され、バン
ドパスフィルタ３を通ることにより、３次の零相高調波
成分のみ、指令電流ｉ0refとしてアクティブフィルタ装
置１に入力される。前記のアクティブフィルタ装置１で
あれば、負荷電流の３次の高調波成分が検出されると、
パルス回路１２は、単相インバータ１１から中性線Ｎに
流れる電流と、前記指令電流ｉ0refとがちょうど逆相に
なるよう、単相インバータ１１に対して制御用ＰＷＭパ
ルス信号を出力する。したがって、中性線Ｎを流れる高
調波成分を補償することができる。On the other hand, the current of each phase flowing through the load is the current transformer C.
By being detected by T, mixed by the mixing circuit 2, and passed through the bandpass filter 3, only the third-order zero-phase harmonic component is input to the active filter device 1 as the command current i 0ref . With the active filter device 1 described above, when the third harmonic component of the load current is detected,
The pulse circuit 12 outputs a control PWM pulse signal to the single-phase inverter 11 so that the current flowing from the single-phase inverter 11 to the neutral line N and the command current i 0ref are in opposite phases. Therefore, the harmonic component flowing through the neutral line N can be compensated.
【００１１】前記１次側中性点ＮF には、零相成分しか
発生しないので、基本波正相電圧分は単相インバータ１
１には加わらない。したがって、単相インバータ１１は
高調波電圧のみを発生すればよく、これにより、単相イ
ンバータ１１の容量の大幅な低減を図ることができる。
また、変圧器Ｔrhの所定次数の高調波成分のみを流せば
よいのであるから、変圧器Ｔrhを小さくすることができ
る。Since only the zero-phase component is generated at the primary side neutral point N F , the positive-phase voltage component of the fundamental wave is generated by the single-phase inverter 1.
Do not join 1. Therefore, the single-phase inverter 11 only needs to generate the harmonic voltage, and thus the capacity of the single-phase inverter 11 can be significantly reduced.
Further, since only the harmonic component of the predetermined order of the transformer T rh needs to flow, the transformer T rh can be made small.
【００１２】以上のことから、負荷から発生する高調波
を十分補償でき、しかも小型で無駄のないアクティブフ
ィルタ装置を実現することができる。なお、本発明は前
記の実施例に限られるものではない、例えば図２に示す
ように、変圧器Ｔrhの１次側中性点ＮF を中性線Ｎに接
続し、２次側Δ結線の一部を開放しそこに単相インバー
タ１１ａを配置してもよい。この場合であっても、単相
インバータ１１ａには零相成分のみ加わるので、零相高
調波成分を補償するアクティブフィルタ装置１ａを実現
することができる。From the above, it is possible to realize an active filter device which is capable of sufficiently compensating for harmonics generated from a load and which is compact and has no waste. It should be noted that the present invention is not limited to the above-described embodiment. For example, as shown in FIG. 2, the primary side neutral point N F of the transformer T rh is connected to the neutral line N, and the secondary side Δ. You may open a part of connection and arrange the single phase inverter 11a there. Even in this case, since only the zero-phase component is added to the single-phase inverter 11a, it is possible to realize the active filter device 1a that compensates the zero-phase harmonic component.
【００１３】さらに、補償したい高調波の次数が複数あ
るときは、図３に示すように、負荷に流れる零相電流の
帯域を制限するフィルタ３ａ−３ｃの数を高調波の次数
（３次、９次、１５次）に応じて複数設ければよい。こ
れにより、負荷から発生するそれぞれ高調波成分が、３
相４線供給用変圧器の中性線Ｎに多量に流れるのを同時
に抑制することができる。Further, when there are a plurality of harmonic orders to be compensated, as shown in FIG. 3, the number of filters 3a-3c for limiting the band of the zero-phase current flowing through the load is set to the harmonic order (3rd order, A plurality may be provided according to the 9th order and the 15th order). As a result, each harmonic component generated from the load is 3
It is possible to simultaneously prevent a large amount of current from flowing into the neutral wire N of the phase 4-wire supply transformer.
【００１４】[0014]
【発明の効果】以上のように本発明のアクティブフィル
タ装置によれば、基本波電圧が加わらない回路に単相イ
ンバータを配置することができるので、単相インバータ
の容量の大幅な低減を図ることができる。また、変圧器
の所定次数の高調波成分のみを流せばよいのであるか
ら、変圧器を小さくすることができる。As described above, according to the active filter device of the present invention, since the single-phase inverter can be arranged in the circuit to which the fundamental wave voltage is not applied, the capacity of the single-phase inverter can be significantly reduced. You can Moreover, since only the harmonic components of the predetermined order of the transformer need to be passed, the transformer can be made smaller.
【００１５】したがって、中性線に高調波成分が著しく
増えるような配線において、容量が小さくても、高調波
成分を十分に補償するアクティブフィルタ装置を実現す
ることができる。また、単相インバータも１つで済み、
全体をコンパクトにすることができるので、アクティブ
フィルタ装置を負荷の近くに分散配置することによっ
て、中性線ケーブルの過負荷対策を経済的に実施するこ
とができる。Therefore, it is possible to realize an active filter device capable of sufficiently compensating for a harmonic component even if the capacitance is small in a wiring in which the harmonic component significantly increases in the neutral line. Also, only one single-phase inverter is required,
Since the whole can be made compact, by disposing the active filter devices in the vicinity of the load, it is possible to economically implement measures against overload of the neutral cable.
【図１】アクティブフィルタ装置を３相４線式配電線に
適用した回路図である。FIG. 1 is a circuit diagram in which an active filter device is applied to a three-phase four-wire distribution line.
【図２】変圧器Ｔrhの１次側中性点ＮF を中性線Ｎに接
続し、２次側Δ結線に単相インバータを配置した変更例
を示す回路図である。FIG. 2 is a circuit diagram showing a modification in which a primary side neutral point N F of a transformer T rh is connected to a neutral line N and a single-phase inverter is arranged on a secondary side Δ connection.
【図３】補償したい高調波の次数が複数あるときに、負
荷に流れる零相電流の帯域を制限するフィルタの数を高
調波の次数に応じて複数設けた変更例を示す図である。FIG. 3 is a diagram showing a modified example in which, when there are a plurality of harmonic orders to be compensated, a plurality of filters that limit the band of the zero-phase current flowing through the load are provided in accordance with the harmonic orders.
【図４】負荷を接続した３相４線式配電線の回路図であ
る。FIG. 4 is a circuit diagram of a three-phase four-wire distribution line to which a load is connected.
【図５】中性線Ｎを流れる高調波成分を補償するため、
単相インバータを各線Ａ，Ｂ，Ｃと中性線Ｎとの間にそ
れぞれ配置していた従来の対策法を示す回路図である。FIG. 5 is a diagram for compensating a harmonic component flowing through a neutral line N,
It is a circuit diagram which shows the conventional countermeasure method which arrange | positioned the single-phase inverter between each line A, B, C and the neutral line N, respectively.
１ アクティブフィルタ装置 ２ 混合回路 ３ バンドパスフィルタ １１ 単相インバータ １２ パルス回路 １３ バンドパスフィルタ ＣＴ 変流器 Ｎ 中性線 ＮF １次側中性点 Ｔrh フィルタ変圧器1 Active Filter Device 2 Mixing Circuit 3 Bandpass Filter 11 Single Phase Inverter 12 Pulse Circuit 13 Bandpass Filter CT Current Transformer N Neutral Wire N F Primary Neutral Point T rh Filter Transformer
Claims (3)
波成分を補償するためのアクティブフィルタ装置であっ
て、 ２次側にΔ結線、１次側に中性点付きＹ結線を有する３
相４線式変圧器を用意し、その変圧器の１次側Ｙ結線を
３相の各相に接続するとともに、この変圧器の零相回路
に単相インバータを接続し、 負荷電流を検出する回路と、検出された負荷電流から所
定の高調波電流を取り出す回路と、この高調波電流の零
相成分を取り出す回路とを設け、 前記取り出された零相成分を前記単相インバータに供給
し、単相インバータから３相４線式回線に補償電流を流
すようにしたことを特徴とするアクティブフィルタ装
置。Claim: What is claimed is: 1. An active filter device for compensating for zero-phase harmonic components flowing through a neutral line of a three-phase four-wire line circuit, comprising a Δ connection on the secondary side and a Y with a neutral point on the primary side. 3 with connection
Prepare a phase 4-wire transformer, connect the primary side Y connection of the transformer to each of the three phases, and connect a single-phase inverter to the zero-phase circuit of this transformer to detect the load current. A circuit, a circuit for extracting a predetermined harmonic current from the detected load current, and a circuit for extracting a zero-phase component of this harmonic current are provided, and the extracted zero-phase component is supplied to the single-phase inverter, An active filter device characterized in that a compensation current is made to flow from a single-phase inverter to a three-phase four-wire system line.
回路とは、変圧器の１次側中性点と前記中性線との間で
ある請求項１記載のアクティブフィルタ装置。2. The active filter device according to claim 1, wherein the zero-phase circuit of the transformer to which the single-phase inverter is connected is between the primary side neutral point of the transformer and the neutral line.
回路とは、変圧器の２次側Δ結線の一部を開放したとき
の開放端である請求項１記載のアクティブフィルタ装
置。3. The active filter device according to claim 1, wherein the zero-phase circuit of the transformer to which the single-phase inverter is connected is an open end when a part of the secondary side Δ connection of the transformer is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27930993A JP3293277B2 (en) | 1993-11-09 | 1993-11-09 | Active filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27930993A JP3293277B2 (en) | 1993-11-09 | 1993-11-09 | Active filter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07135735A true JPH07135735A (en) | 1995-05-23 |
| JP3293277B2 JP3293277B2 (en) | 2002-06-17 |
Family
ID=17609374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27930993A Expired - Fee Related JP3293277B2 (en) | 1993-11-09 | 1993-11-09 | Active filter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3293277B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19529302A1 (en) * | 1995-08-09 | 1997-02-13 | Siemens Ag | Device for compensating harmonic currents of a transmission path consisting of several conductors |
| WO2004010558A1 (en) * | 2002-07-19 | 2004-01-29 | Power System Diagnosis Tech., Inc. | Active power filter apparatus with reduced va rating for neutral current suppression |
| KR100485504B1 (en) * | 2002-08-09 | 2005-04-27 | 동부아남반도체 주식회사 | Apparatus for lowering an earth electric potential in semiconductor device |
| KR100685289B1 (en) * | 2004-08-25 | 2007-02-22 | 이성호 | Apparatus removing harmonics of 3-phase multiple-line power line |
| KR100729239B1 (en) * | 2006-08-22 | 2007-06-15 | (합)동양엔지니어링 | A lighting lamp using neutral line current |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638044B (en) * | 2012-04-17 | 2014-06-18 | 湖南大学 | Control method for predicating switching signal of three-phase four-wire active filter |
-
1993
- 1993-11-09 JP JP27930993A patent/JP3293277B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19529302A1 (en) * | 1995-08-09 | 1997-02-13 | Siemens Ag | Device for compensating harmonic currents of a transmission path consisting of several conductors |
| WO2004010558A1 (en) * | 2002-07-19 | 2004-01-29 | Power System Diagnosis Tech., Inc. | Active power filter apparatus with reduced va rating for neutral current suppression |
| KR20040008610A (en) * | 2002-07-19 | 2004-01-31 | 최세완 | Active power filter apparatus with reduced VA rating for neutral current suppression |
| KR100485504B1 (en) * | 2002-08-09 | 2005-04-27 | 동부아남반도체 주식회사 | Apparatus for lowering an earth electric potential in semiconductor device |
| KR100685289B1 (en) * | 2004-08-25 | 2007-02-22 | 이성호 | Apparatus removing harmonics of 3-phase multiple-line power line |
| KR100729239B1 (en) * | 2006-08-22 | 2007-06-15 | (합)동양엔지니어링 | A lighting lamp using neutral line current |
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| Publication number | Publication date |
|---|---|
| JP3293277B2 (en) | 2002-06-17 |
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