JPH0636330U - Active filter - Google Patents
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- JPH0636330U JPH0636330U JP6961892U JP6961892U JPH0636330U JP H0636330 U JPH0636330 U JP H0636330U JP 6961892 U JP6961892 U JP 6961892U JP 6961892 U JP6961892 U JP 6961892U JP H0636330 U JPH0636330 U JP H0636330U
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- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 230000001629 suppression Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
(57)【要約】
【目的】 ３相４線系統も含めた任意系統の高調波抑制
を得る。
【構成】 ３相４線の配電系統の各相と中性線間の高調
波電流を変流器１０U，１０V，１０Wで検出し、この検
出電流に応じて制御回路１１が３つの単相インバータ８
U，８V，８Wの高調波補償電流出力を相別に制御し、各
単相インバータの出力を変圧器９U，９V，９Wで各相
Ｕ，Ｖ，Ｗと中性線Ｎ間に注入する。
(57) [Summary] [Purpose] To obtain harmonic suppression of an arbitrary system including a 3-phase 4-wire system. [Structure] The harmonic current between each phase of the three-phase four-wire distribution system and the neutral line is detected by the current transformers 10 U , 10 V , and 10 W , and the control circuit 11 detects three currents according to the detected current. Single phase inverter 8
U , 8 V , 8 W harmonic compensation current output is controlled for each phase, the output of each single-phase inverter is between transformers 9 U , 9 V , 9 W between each phase U, V, W and neutral line N. Inject.
Description
【０００１】[0001]
本考案は、電力系統に発生する高調波を抑制するためのアクティブフィルタに 関する。 The present invention relates to an active filter for suppressing harmonics generated in a power system.
【０００２】[0002]
電力系統の負荷にサイリスタ応用機器が普及し、これら機器から発生する高調 波電流が電力系統の供給電圧の波形をひずませる原因となる。 Thyristor-applied equipment has become widespread as a load on the power system, and the harmonic currents generated by these devices can distort the waveform of the supply voltage of the power system.
【０００３】 この高調波抑制のためのアクティブフィルタは、インバータを主回路として機 器が発生する高調波電流と逆位相の高調波電流を系統に注入し、高調波電流を相 殺する。The active filter for suppressing the harmonics injects a harmonic current having a phase opposite to that of the harmonic current generated by the device into the system by using the inverter as a main circuit, and cancels the harmonic current.
【０００４】 図２は従来のアクティブフィルタを示し、変電所の変圧器１等を介した３相配 電系統２の負荷３が発生する高調波電流を高周波変流器４によって検出し、３相 ＰＷＭインバータ５に逆相の３相の高調波補償電流を発生し、この電流を出力ト ランス６を介して配電系統２に注入する。FIG. 2 shows a conventional active filter, in which a harmonic current generated by a load 3 of a three-phase distribution system 2 via a transformer 1 of a substation is detected by a high-frequency current transformer 4 and a three-phase PWM is detected. Reverse phase three-phase harmonic compensation currents are generated in the inverter 5, and these currents are injected into the distribution system 2 via the output transformer 6.
【０００５】[0005]
従来のアクティブフィルタは、３相ブリッジ構成を主回路とする３相インバー タによるもので、高調波補償対象は３相３線配電系統には適用できるが、３相４ 線あるいは単相２線の系統に発生する高調波は抑制できない。 The conventional active filter is based on a three-phase inverter with a three-phase bridge configuration as the main circuit, and the harmonic compensation target can be applied to a three-phase three-wire distribution system, but the three-phase four-wire or single-phase two-wire system is used. Harmonics generated in the grid cannot be suppressed.
【０００６】 このため、図３に示す３相４線の系統に発生する高調波、特にＮ相を帰線とす る３ｎ（ｎ＝１．２．３…ｋ）次の高調波による電源電圧波形のひずみが不平衡 で発生し、電圧降下にもなる。図４は３次高調波による電圧波形のひずみを示し 、波高価が正弦波に比べて低くなる。Therefore, the power supply voltage due to the harmonics generated in the three-phase four-wire system shown in FIG. 3, particularly the 3n (n = 1.2.3 ... k) -th harmonics with the N-phase as the return line Waveform distortion occurs unbalanced and also results in voltage drop. FIG. 4 shows the distortion of the voltage waveform due to the third harmonic, and the cost is lower than that of the sine wave.
【０００７】 本考案の目的は、３相４線系統も含めた任意系統の高調波抑制を得ることがで きるアクティブフィルタを提供することにある。An object of the present invention is to provide an active filter that can obtain harmonic suppression of an arbitrary system including a 3-phase 4-wire system.
【０００８】[0008]
本考案は、前記課題の解決を図るため、高調波補償電流を発生する３つの単相 インバータと、高調波抑制対象となる３相４線式電力系統から相単位で検出した 高調波電流に応じて前記各単相インバータの出力電流を夫々制御する制御回路と 、前記各単相インバータの出力を高調波抑制対象相と中性線間に夫々注入する３ つの変圧器とを備えたことを特徴とする。 In order to solve the above-mentioned problems, the present invention responds to three single-phase inverters that generate harmonic compensation currents and harmonic currents detected in phase units from a three-phase four-wire power system subject to harmonic suppression. A control circuit for respectively controlling the output current of each of the single-phase inverters, and three transformers for respectively injecting the output of each of the single-phase inverters between the harmonic suppression target phase and the neutral line. And
【０００９】[0009]
３つの単相インバータによって各相と中性線間に個別の高調波電流の検出と高 調波補償電流の注入を行う。 Three single-phase inverters detect individual harmonic currents and inject high-harmonic compensation currents between each phase and the neutral line.
【００１０】[0010]
図１は本考案の一実施例を示す回路図である。同図は３相４線式配電系統に適 用した場合を示す。変圧器１から３相４線式で負荷３に配電するにおいて、アク ティブフィルタ７は単相，インバータ８U，８V，８Wから電圧整合用変圧器９U， ９V，９Wを介して各相Ｕ，Ｖ，Ｗと中性線Ｎとの間に夫々高調波補償電流を供給 する。FIG. 1 is a circuit diagram showing an embodiment of the present invention. The figure shows the case of application to a 3-phase 4-wire distribution system. In distributing the power from the transformer 1 to the load 3 by the three-phase four-wire system, the active filter 7 is a single-phase inverter 8 U , 8 V , 8 W to the voltage matching transformers 9 U , 9 V , 9 W. And supplies a harmonic compensation current between each phase U, V, W and the neutral wire N.
【００１１】 インバータ８U，８V，８Wの制御は、対象とする相の負荷電流を夫々変流器１ ０U，１０V，１０Wによって検出し、この検出電流から高調波成分ＩnU，Ｉnv， ＩnWを抽出することによって制御回路１１が各インバータ８U，８V，８Wの出力 電流制御を行い、高調波成分の逆位相の補償電流を各相に注入する。The control of the inverters 8 U , 8 V , and 8 W is performed by detecting the load current of the target phase by the current transformers 10 U , 10 V , and 10 W , and detecting the harmonic components I nU from the detected current. , I nv , I nW are extracted by the control circuit 11 to control the output currents of the inverters 8 U , 8 V , 8 W , and the antiphase compensation current of the harmonic component is injected into each phase.
【００１２】 本実施例によれば、負荷３によって発生する高調波電流は各相個別にインバー タ８U，８V，８Wから補償電流を注入することにより補償する。これにより、負 荷３が不平衡負荷になる場合にも高調波抑制が可能となる。さらに、各相単相で の補償になることから、各相単位での力率調整が可能となる。According to this embodiment, the harmonic current generated by the load 3 is compensated by injecting the compensation current from the inverters 8 U , 8 V and 8 W individually for each phase. This enables harmonic suppression even when the load 3 becomes an unbalanced load. Furthermore, since the compensation is performed for each phase and single phase, the power factor can be adjusted for each phase.
【００１３】 また、本実施例の構成は、３相３線式の系統には変圧器の結線を変更すること で適用できるほか、単相の配電系統に適用するには単相インバータ８Uと変圧器 ９Uと単相制御に回路省略した制御回路１１及び変流器１０Uを接続する構成で実 現される。換言すれば、制御回路１１の相数増設可能にした単相用アクティブフ ィルタを３相分結合することによって３相４線式配電系統に適用でき、任意の電 力系統に適用できる効果がある。In addition, the configuration of the present embodiment can be applied to a three-phase three-wire system by changing the wiring of the transformer, and a single-phase inverter 8 U for application to a single-phase power distribution system. This is realized by a configuration in which the transformer 9 U , the control circuit 11 and the current transformer 10 U, which are omitted for single-phase control, are connected. In other words, it can be applied to a three-phase four-wire distribution system by connecting three single-phase active filters capable of increasing the number of phases of the control circuit 11, and can be applied to any power system. .
【００１４】[0014]
以上のとおり、本考案によれば、３つの単相インバータから各相と中性線間に 個別の高調波電流検出と高調波補償電流の注入をするようにしたため、３相４線 式の系統で単相負荷が発生する不平衡負荷にも個別の補償によって高調波抑制が できる。 As described above, according to the present invention, since the individual harmonic currents are individually detected and the harmonic compensation currents are injected from the three single-phase inverters between each phase and the neutral line, the three-phase four-wire system is used. Even for unbalanced loads where a single-phase load is generated, harmonics can be suppressed by individual compensation.
【００１５】 また、３相３線式や単相の系統にも少しの変更で対応でき、さらに各相単位の 力率調整も可能となる。Further, it is possible to cope with a three-phase three-wire system or a single-phase system with a slight change, and it is also possible to adjust the power factor for each phase.
【図１】本考案の一実施例を示す回路図。FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】従来のアクティブフィルタ。FIG. 2 is a conventional active filter.
【図３】３相４線の回路図。FIG. 3 is a circuit diagram of 3-phase 4-wire.
【図４】高調波ひずみ波形図。FIG. 4 is a harmonic distortion waveform diagram.
１…変圧器 ３…負荷 ７…アクティブフィルタ ８U，８V，８W…単位インバータ １１…制御回路1 ... Transformer 3 ... Load 7 ... Active filter 8 U , 8 V , 8 W ... Unit inverter 11 ... Control circuit
Claims (1)
ンバータと、高調波抑制対象となる３相４線式電力系統
から相単位で検出した高調波電流に応じて前記各単相イ
ンバータの出力電流を夫々制御する制御回路と、前記各
単相インバータの出力を高調波抑制対象相と中性線間に
夫々注入する３つの変圧器とを備えたことを特徴とする
アクティブフィルタ。1. A three-phase inverter that generates a harmonic compensation current, and one of the single-phase inverters according to the harmonic current detected in phase units from a three-phase four-wire power system that is a target for harmonic suppression. An active filter comprising: a control circuit for controlling an output current, and three transformers for respectively injecting an output of each of the single-phase inverters between a harmonic suppression target phase and a neutral line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6961892U JPH0636330U (en) | 1992-10-07 | 1992-10-07 | Active filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6961892U JPH0636330U (en) | 1992-10-07 | 1992-10-07 | Active filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0636330U true JPH0636330U (en) | 1994-05-13 |
Family
ID=13408041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6961892U Pending JPH0636330U (en) | 1992-10-07 | 1992-10-07 | Active filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636330U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014016918A1 (en) * | 2012-07-25 | 2014-01-30 | 三菱電機株式会社 | Electric power transmission device |
-
1992
- 1992-10-07 JP JP6961892U patent/JPH0636330U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014016918A1 (en) * | 2012-07-25 | 2014-01-30 | 三菱電機株式会社 | Electric power transmission device |
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