JPH07298500A - 3-phase balancing apparatus - Google Patents
3-phase balancing apparatusInfo
- Publication number
- JPH07298500A JPH07298500A JP6084255A JP8425594A JPH07298500A JP H07298500 A JPH07298500 A JP H07298500A JP 6084255 A JP6084255 A JP 6084255A JP 8425594 A JP8425594 A JP 8425594A JP H07298500 A JPH07298500 A JP H07298500A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- component
- reactive
- current
- conversion
- 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.)
- Pending
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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、力率補償機能を有する
三相平衡装置（三相不平衡補償装置）の力率補償量を任
意に設定しうるようにし三相平衡装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase balance device in which a power factor compensation amount of a three-phase balance device (three-phase unbalance compensator) having a power factor compensation function can be arbitrarily set.
【０００２】[0002]
【従来の技術】力率補償機能を付加した三相平衡装置
（三相不平衡補償装置）は、三相負荷電流の逆相分と無
効分を検出して三相不平衡補償制御をしている。2. Description of the Related Art A three-phase balance device (three-phase unbalance compensator) having a power factor compensation function detects a reverse phase component and a reactive component of a three-phase load current to perform three-phase unbalance compensation control. There is.
【０００３】この補償電流検出回路は図２に示すよう
に、検出した三相電流ｉU，ｉV，ｉWから帯域フィルタ
１により基本波成分ｉUｆ，ｉVｆ，ｉWｆを抽出し、こ
の三相交流を三相／二相変換回路２で二相交流ｉａｆ，
ｉｂｆに変換し、更に回転座標変換回路３により正相分
を直流、逆相分を第二次調波とする有効電力による電流
成分ｉｐと、無効電力による電流成分ｉｑに変換し、こ
の有効電流成分ｉｐから直流分（正相分）を除去した第
二次調波成分（逆相成分）ｉｐ2を抽出し、この逆相分
ｉｐ2と無効電流成分ｉｑを回転座標変換回路８により
回転座標変換回路３の逆変換をし、その二相電流ｉ
ａ′，ｉｂ′を更に二相／三相変換回路９で三相電流ｉ
U′，ｉV′，ｉW′に変換することにより、三相電流
ｉU，ｉV，ｉWから補償電流（基本波逆相電流成分＋無
効電流成分）ｉU′，ｉV′，ｉW′を検出している。As shown in FIG. 2, this compensation current detection circuit extracts the fundamental wave components i U f, i V f, i W f from the detected three-phase currents i U , i V , i W by a bandpass filter 1. Then, this three-phase alternating current is converted into a two-phase alternating current iaf by the three-phase / two-phase conversion circuit 2.
ibf, and the rotational coordinate conversion circuit 3 further converts the positive phase component into a direct current and the negative phase component into a current component ip due to active power and a current component iq due to reactive power. The second harmonic component (negative phase component) ip 2 from which the direct current component (positive phase component) is removed from the component ip is extracted, and the negative coordinate component ip 2 and the reactive current component iq are rotated by the rotating coordinate conversion circuit 8. The reverse conversion of the conversion circuit 3 is performed, and the two-phase current i
The a ', ib' are further converted into a three-phase current i by the two-phase / three-phase conversion circuit 9.
By converting to U ′, i V ′, i W ′, the three-phase currents i U , i V , i W are compensated for (fundamental reverse phase current component + reactive current component) i U ′, i V ′, i W 'is detected.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の補償電流検
出回路は、逆相成分と無効分を一括して各種演算を行う
ため、三相平衡装置が力率補償機能を必要としない場合
にも力率補償を行ってしまうため、装置容量を大きく設
計しなければならない。また、逆相成分と無効分を一括
して扱っているため、無効分の補償容量を任意に設定す
ることができないので、大きな装置容量が必要となって
しまう。The above-mentioned conventional compensating current detection circuit performs various calculations collectively on the anti-phase component and the reactive component. Therefore, even when the three-phase balancing device does not need the power factor compensation function. Since power factor compensation is performed, the device capacity must be designed large. Further, since the anti-phase component and the ineffective component are collectively handled, the ineffective component compensation capacity cannot be arbitrarily set, and thus a large device capacity is required.
【０００５】本発明は、従来のこのような問題点に鑑み
てなされたものであり、その目的とするところは、無効
電流を任意に設定することができると共に力率補償機能
を外すことができる三相平衡装置を提供することにあ
る。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to set a reactive current arbitrarily and remove a power factor compensation function. It is to provide a three-phase balancing device.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明における三相平衡装置は、検出した三相電流
を三相二相変換し、更に回転座標変換して有効分電流及
び無効分電流を得て、その有効分電流の第二調波を分離
し、その第二次調波と前記無効分電流を前記回転座標変
換の逆変換をし、更に二相三相変換した信号を補償電流
として三相不平衡補償する三相平衡装置において、回転
座標変換された無効分電流から直流分及び第二次調波を
分離する低減通過フィルタ及び帯域通過フィルタと、低
域通過フィルタからの直流分を制限するリミット回路
と、帯域通過フィルタからの信号とリミット回路からの
信号を加算し回転座標変換の逆変換をする回転座標変換
回路の無効分電流入力側に出力する加算器と、力率補償
を必要としないときリミット回路から加算器に入力する
信号を零とする手段と、を設けたものである。In order to achieve the above object, the three-phase balancing apparatus in the present invention converts the detected three-phase current into three-phase to two-phase, and further performs rotational coordinate conversion to convert the active component current and the reactive component current. The divided current is obtained, the second harmonic of the effective divided current is separated, the second harmonic and the reactive current are subjected to the inverse conversion of the rotational coordinate conversion, and the two-phase and three-phase converted signal is obtained. In a three-phase balance device that performs three-phase unbalance compensation as a compensation current, a reduction pass filter and a band pass filter that separate the direct current component and the second harmonic from the reactive component current that has undergone rotational coordinate conversion, and the low pass filter from the low pass filter. A limit circuit that limits the direct current component, an adder that adds the signal from the band pass filter and the signal from the limit circuit and performs the inverse transformation of the rotary coordinate transformation, and outputs to the reactive current input side of the rotary coordinate transformation circuit. When you do not need rate compensation Means for the zero signal input from mitt circuit to the adder, in which the provided.
【０００７】[0007]
【作用】低域通過フィルタ及び帯域通過フィルタにより
回転座標変換回路から出力される無効分を直流分と第二
次調波に分離し、直流分をリミッタ回路，スイッチを介
して加算器で加算しているので、リミッタ回路のリミッ
タ値を１００％とすれば、加算器の出力は回転座標変換
回路から出力される無効分とと同じくなる。しかして検
出される無効電流は従来と同じくなり、力率補償は従来
同様にされる。[Function] The reactive component output from the rotary coordinate conversion circuit is separated into the direct current component and the second harmonic by the low pass filter and the band pass filter, and the direct current component is added by the adder via the limiter circuit and the switch. Therefore, if the limiter value of the limiter circuit is 100%, the output of the adder becomes the same as the invalid component output from the rotary coordinate conversion circuit. The reactive current thus detected is the same as in the conventional case, and the power factor compensation is the same as in the conventional case.
【０００８】リミッタ値を下げれば加算器で加算される
直流分が減少する。このため検出される無効電流制限さ
れるので、リミッタ値を変更することはにより無効電力
補償量を変えることができる。スイッチをオフすると加
算器で加算される直流分は０となるので、無効電力補償
量は０となる。If the limiter value is lowered, the direct current component added by the adder is reduced. For this reason, the reactive current detected is limited. Therefore, changing the limiter value can change the reactive power compensation amount. When the switch is turned off, the DC component added by the adder becomes 0, so the reactive power compensation amount becomes 0.
【０００９】[0009]
【実施例】本発明の実施例について図１を参照して説明
する。図１は三相平衡装置の補償量検出回路を示すもの
で、２は検出した三相電流ｉU，ｉV，ｉWを二相電流ｉ
ａ，ｉｂに変換する三相／二相変換回路、３は二相電流
ｉａ，ｉｂの基本波正相分を直流，基本波逆相分を第二
次調波に変換し、有効電力による電流成分ｉｐと無効電
力による電流成分ｉｑを出力する回転座標変換回路。Embodiments of the present invention will be described with reference to FIG. FIG. 1 shows a compensation amount detection circuit of a three-phase balance device. Reference numeral 2 indicates the detected three-phase currents i U , i V , and i W.
A three-phase / two-phase conversion circuit 3 for converting into a and ib converts a positive-phase component of the fundamental wave of the two-phase currents ia and ib into a direct current and a negative-phase component of the fundamental wave into a second-harmonic component. A rotational coordinate conversion circuit that outputs a component ip and a current component iq due to reactive power.
【００１０】４ａは有効電流成分ｉｐから逆相分の第二
次高調波ｉｐ2を抽出する帯域フィルタ、４ｂは無効電
流成分ｉｑから逆相分の第二次調波ｉｑ2を抽出する帯
域通過フィルタ、４ｃは無効電流成分ｉｑから正相分の
直流分ｉｑｄを抽出する低域通過フィルタ、６はこの直
流分ｉｑｄを任意に制限して出力するリミット回路、Ｓ
はリミット回路からの直流分ｉｑｄ′を出力する力率補
償機能切離し用スイッチ、７はフィルタ４ｂからの第二
次調波ｉｑ2とスイッチＳからの直流分ｉｑｄ′を加算
し無効分ｉｑ′を出力する加算器。Reference numeral 4a denotes a bandpass filter for extracting the second harmonic wave ip 2 of the antiphase component from the active current component ip, and 4b is a bandpass filter for extracting the second harmonic wave iq 2 of the antiphase component from the reactive current component iq. A filter, 4c is a low-pass filter for extracting a direct current component iqd for the positive phase from the reactive current component iq, 6 is a limit circuit for arbitrarily limiting and outputting the direct current component iqd, S
Is a switch for disconnecting the power factor compensation function which outputs the direct current component iqd 'from the limit circuit, and 7 adds the second harmonic wave iq 2 from the filter 4b and the direct current component iqd' from the switch S to obtain the invalid component iq '. Output adder.
【００１１】８はフィルタ４ａからの第二次調波ｉｐ2
と加算器７からの無効分ｉｑ′が入力し、二相電流ｉ
ａ′，ｉｂ′を出力する回転座標変換回路、９は二相電
流ｉａ′，ｉｂ′を三相電流ｉU′，ｉV′，ｉW′に変
換する二相／三相変換回路である。Reference numeral 8 denotes the second harmonic wave ip 2 from the filter 4a.
And the reactive component iq ′ from the adder 7 are input, and the two-phase current i
a ', ib' rotating coordinate conversion circuit for outputting, 9 is the two-phase currents ia ', ib' the three-phase currents i U ', i V', the two-phase / three-phase converting circuit for converting the i W ' .
【００１２】以上のように回転座標変換回路３から出力
される無効電流成分ｉｑは帯域通過フィルタ４ｂと低域
通過フィルタ４ｃにより第二次調波ｉｑ2と直流分ｉｑ
ｄに分離され、直流分ｉｑｄはリミット回路６により任
意のリミットがかけられスイッチＳを介して加算器７で
加算される構成となっているので、リミット回路６のリ
ミット値が１００％であれば、直流分ｉｑｄ′＝ｉｑｄ
で、加算器の出力はｉｑ′＝ｉｑ2＋ｉｑｄ＝ｉｑとな
り、回転座標変換回路８に入力する有効分と無効分はｉ
ｐ2とｉｑとなるので、二相／三相変換回路から出力す
る補償電流（不平衡分＝逆相成分＋無効成分）ｉU，
ｉV，ｉWは従来図２のものと同じくなる。As described above, the reactive current component iq output from the rotary coordinate conversion circuit 3 is subjected to the second harmonic iq 2 and the direct current component iq by the band pass filter 4b and the low pass filter 4c.
Since the direct current component iqd is separated into d and an arbitrary limit is applied by the limit circuit 6 and added by the adder 7 via the switch S, if the limit value of the limit circuit 6 is 100%, , DC component iqd ′ = iqd
Then, the output of the adder becomes iq ′ = iq 2 + iqd = iq, and the effective component and the invalid component input to the rotary coordinate conversion circuit 8 are i.
p 2 and iq, the compensation current output from the two-phase / three-phase conversion circuit (unbalanced component = negative-phase component + ineffective component) i U ,
i V and i W are the same as those shown in FIG.
【００１３】また、リミット回路６のリミット値を任意
に設定すれば、加算器７に加算される直流分ｉｑｄ′＜
ｉｑｄとなるので、検出される補償電流中の無効電流が
減少する。したがって、リミット回路６の設定により三
相平衡装置の力率補償容量を任意に変えることができ
る。If the limit value of the limit circuit 6 is arbitrarily set, the direct current component iqd '<added to the adder 7 is added.
Since it becomes iqd, the reactive current in the detected compensation current decreases. Therefore, the power factor compensation capacity of the three-phase balance device can be arbitrarily changed by setting the limit circuit 6.
【００１４】またスイッチＳをオフとすれば、加算器に
入力する無効分ｉｑｄ′は０となり、検出される補償電
流中の無効分が０となるので、三相平衡装置の力率補償
機能を０とすることができる。Further, when the switch S is turned off, the reactive component iqd 'input to the adder becomes 0, and the reactive component in the detected compensation current becomes 0, so that the power factor compensation function of the three-phase balance device is realized. It can be zero.
【００１５】[0015]
【発明の効果】本発明は、上述のとおり構成されている
ので、次に記載する効果を奏する。Since the present invention is configured as described above, it has the following effects.
【００１６】（１）無効電流成分にリミットをかけるこ
とができるので、装置が出力できる無効電流を任意に設
定することができる。このため装置容量の適切な設計が
できる。(1) Since the reactive current component can be limited, the reactive current that can be output by the device can be arbitrarily set. Therefore, the device capacity can be appropriately designed.
【００１７】（２）力率補償機能が必要でない場合に
は、スイッチをオフとすることにより力率補償機能を外
すことができる。(2) When the power factor compensation function is not required, the power factor compensation function can be removed by turning off the switch.
【図１】実施例にかかる補償電流検出回路を示すブロッ
ク図。FIG. 1 is a block diagram showing a compensation current detection circuit according to an embodiment.
【図２】従来例にかかる補償電流検出回路を示すブロッ
ク図。FIG. 2 is a block diagram showing a compensation current detection circuit according to a conventional example.
１，４ａ，４ｂ…帯域通過フィルタ ２…三相／二相変換回路 ３…回転座標変換回路 ４ｃ…低域通過フィルタ ５…高域通過フィルタ ６…リミット回路 ７…加算器 ８…回転座標変換回路（逆変換用） ９…二相／三相変換回路 Ｓ…力率補償機能切離し用スイッチ 1, 4a, 4b ... Band pass filter 2 ... Three-phase / two-phase conversion circuit 3 ... Rotation coordinate conversion circuit 4c ... Low pass filter 5 ... High pass filter 6 ... Limit circuit 7 ... Adder 8 ... Rotation coordinate conversion circuit (For reverse conversion) 9 ... Two-phase / three-phase conversion circuit S ... Switch for power factor compensation disconnection
Claims (1)
に回転座標変換して有効分電流及び無効分電流を得て、
その有効分電流の第二調波を分離し、その第二次調波と
前記無効分電流を前記回転座標変換の逆変換をし、更に
二相三相変換した信号を補償電流として三相不平衡補償
する三相平衡装置において、 前記回転座標変換された無効分電流から直流分及び第二
次調波を分離する低減通過フィルタ及び帯域通過フィル
タと、 前記低域通過フィルタからの直流分を制限するリミット
回路と、 前記帯域通過フィルタからの信号とリミット回路からの
信号を加算し回転座標変換の逆変換をする回転座標変換
回路の無効分電流入力側に出力する加算器と、 力率補償を必要としないとき前記リミット回路から加算
器に入力する信号を零とする手段と、 を設けたことを特徴とした三相平衡装置。1. The detected three-phase current is subjected to three-phase to two-phase conversion and further rotational coordinate conversion to obtain an active component current and a reactive component current,
The second harmonic of the active component current is separated, the second harmonic and the reactive component current are inversely transformed by the rotational coordinate conversion, and the signal obtained by the two-phase and three-phase conversion is used as a compensation current to generate a three-phase unbalanced signal. In a three-phase balance device for balanced compensation, a reduction pass filter and a band pass filter for separating a direct current component and a second harmonic from the reactive current that has been subjected to rotational coordinate conversion, and a direct current component from the low pass filter are limited. Limit circuit, an adder for adding the signal from the band-pass filter and the signal from the limit circuit and performing inverse conversion of the rotary coordinate conversion, and outputting the reactive current input side of the rotary coordinate conversion circuit, and power factor compensation. A three-phase balancing device, characterized in that: means for making the signal input to the adder from the limit circuit to zero when not required;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6084255A JPH07298500A (en) | 1994-04-22 | 1994-04-22 | 3-phase balancing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6084255A JPH07298500A (en) | 1994-04-22 | 1994-04-22 | 3-phase balancing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07298500A true JPH07298500A (en) | 1995-11-10 |
Family
ID=13825355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6084255A Pending JPH07298500A (en) | 1994-04-22 | 1994-04-22 | 3-phase balancing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07298500A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013085338A (en) * | 2011-10-07 | 2013-05-09 | Daihen Corp | Phase adjusting device, system counter component generating device, system interconnection inverter system, and phase adjusting method |
| CN107579522A (en) * | 2017-09-11 | 2018-01-12 | 云南电网有限责任公司西双版纳供电局 | Coordinated control system based on Ip Iq theories harmonic wave controls and reactive-load compensation |
| CN115800332A (en) * | 2023-01-09 | 2023-03-14 | 西安领充创享新能源科技有限公司 | Load adjusting method and system |
-
1994
- 1994-04-22 JP JP6084255A patent/JPH07298500A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013085338A (en) * | 2011-10-07 | 2013-05-09 | Daihen Corp | Phase adjusting device, system counter component generating device, system interconnection inverter system, and phase adjusting method |
| CN107579522A (en) * | 2017-09-11 | 2018-01-12 | 云南电网有限责任公司西双版纳供电局 | Coordinated control system based on Ip Iq theories harmonic wave controls and reactive-load compensation |
| CN115800332A (en) * | 2023-01-09 | 2023-03-14 | 西安领充创享新能源科技有限公司 | Load adjusting method and system |
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