JPH08114633A - Power flow detection circuit - Google Patents
Power flow detection circuitInfo
- Publication number
- JPH08114633A JPH08114633A JP6248997A JP24899794A JPH08114633A JP H08114633 A JPH08114633 A JP H08114633A JP 6248997 A JP6248997 A JP 6248997A JP 24899794 A JP24899794 A JP 24899794A JP H08114633 A JPH08114633 A JP H08114633A
- Authority
- JP
- Japan
- Prior art keywords
- power flow
- power
- load
- current
- detection 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.)
- Withdrawn
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、負荷に複数の電源が接
続された電力系統のための潮流検出回路に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power flow detection circuit for a power system in which a plurality of power sources are connected to a load.
【０００２】[0002]
【従来の技術】例えば太陽光発電装置を組み込んだ電力
系統においては、負荷に対して複数の電源が接続される
ことが多く、負荷に対してどの電源から電力が供給され
ているのかを正確に把握するために、電力潮流の方向を
検出する必要がある。2. Description of the Related Art For example, in a power system incorporating a photovoltaic power generator, a plurality of power sources are often connected to a load, and it is possible to accurately determine from which power source the power is being supplied to the load. In order to understand, it is necessary to detect the direction of the power flow.
【０００３】このような電力潮流の方向を検出するため
には、従来から主として方向継電器が使用されてきた。
方向継電器は２つの入力量の位相差を利用して電力の潮
流方向を判別するものである。方向継電器の方式として
は、電磁形継電器では誘導円板形や誘導円筒形、アナロ
グ静止形継電器では位相検出原理、ディジタル形継電器
では積加算原理が用いられてきた。In order to detect the direction of such a power flow, a directional relay has been mainly used conventionally.
The directional relay uses the phase difference between two input quantities to determine the power flow direction. As the method of the directional relay, the induction disk type and the induction cylindrical type are used in the electromagnetic type relay, the phase detection principle is used in the analog static type relay, and the product addition principle is used in the digital type relay.
【０００４】しかし、上記した各方式ともに基本的には
電流と電圧とを検出し、電圧の位相を基準として電流の
方向を判別するものであり、回路構成が複雑となるうえ
に、誘導形の方向継電器は装置自体も大型となるという
問題があった。However, each of the above-mentioned methods basically detects the current and the voltage, and determines the direction of the current with reference to the phase of the voltage, which complicates the circuit configuration and is of an inductive type. The directional relay has a problem that the device itself becomes large.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、きわめて簡単な部品構成によって単
相電力の潮流方向を確実に検出することができる潮流検
出回路を提供するためになされたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a power flow detection circuit capable of reliably detecting the power flow direction of single-phase power with an extremely simple component configuration. It was made.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の潮流検出回路は、負荷に複数の電
源が接続された電力系統のための潮流検出回路であっ
て、電源と負荷との間に負荷と並列に検出用インピーダ
ンスを設け、その２本のリード線の母線との接続部を互
いに反対方向に折り曲げ、それぞれの折り曲げ部と母線
との外周に電流検出器を取り付けたことを特徴とするも
のである。The power flow detection circuit of the present invention made to solve the above problems is a power flow detection circuit for a power system in which a plurality of power supplies are connected to a load. A detection impedance was provided between the load and the load in parallel, the connecting portions of the two lead wires with the busbar were bent in opposite directions, and a current detector was attached to the outer periphery of each bent portion and the busbar. It is characterized by that.
【０００７】[0007]
【作用】本発明の潮流検出回路によれば、次の実施例に
示すように、検出用インピーダンスの２本のリード線の
母線との接続部に設けられた２つの電流検出器の検出電
流を比較することにより、電力潮流の方向を正確に検出
することができる。しかも通常の電流検出器のみにより
検出が可能であり、従来のような回路構成が複雑な方向
継電器を必要としない利点がある。According to the power flow detection circuit of the present invention, as shown in the following embodiment, the detection currents of the two current detectors provided at the connecting portion of the two impedance detection lead wires to the bus bar are detected. By comparing, the direction of the power flow can be detected accurately. In addition, it is possible to detect only with a normal current detector, and there is an advantage that a conventional directional relay having a complicated circuit configuration is not required.
【０００８】[0008]
【実施例】以下に本発明を図示の実施例によって更に詳
細に説明する。図１は負荷に複数の電源が接続された電
力系統を概念的に示した図であり、１は第１の電源、２
は第２の電源、３はこれらの電源と母線４によって接続
された負荷である。鎖線で囲んだ５は観測点であり、こ
の観測点５において電力潮流が第１の電源１から第２の
電源２に向かって流れているのか、あるいは逆に第２の
電源２から第１の電源１に向かって流れているのかを検
出することが求められているものとする。The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is a diagram conceptually showing a power system in which a plurality of power sources are connected to a load, and 1 is a first power source, 2
Is a second power supply, and 3 is a load connected to these power supplies by a bus bar 4. Reference numeral 5 surrounded by a chain line is an observation point. At this observation point 5, whether the power flow is flowing from the first power source 1 to the second power source 2 or, conversely, from the second power source 2 to the first power source 2. It is assumed that it is required to detect whether it is flowing toward the power supply 1.
【０００９】そこで図２に示すように、観測点５に本発
明の潮流検出回路を設ける。図２において６は負荷３と
平行に配置された検出用インピーダンスである。この検
出用インピーダンス６の２本のリード線７、８の母線４
との接続部は、図２に示すように互いに反対方向に（即
ちリード線７は第１の電源１側に、リード線８は負荷３
側に）折り曲げてあり、各折り曲げ部と母線４との外周
にそれぞれ電流検出器９、10が取り付けられている。な
お、検出用インピーダンス６の値は、電流検出器９、10
の二次巻数の値によって任意に選定することができる。Therefore, as shown in FIG. 2, the power flow detection circuit of the present invention is provided at the observation point 5. In FIG. 2, reference numeral 6 is a detection impedance arranged in parallel with the load 3. Bus line 4 of two lead wires 7 and 8 of this detection impedance 6
As shown in FIG. 2, the connecting portions of the lead wire 7 and the load wire 3 are opposite to each other (that is, the lead wire 7 is on the first power source 1 side, and the lead wire 8 is on the load 3 side).
It is bent and the current detectors 9 and 10 are attached to the outer circumferences of the bent portions and the bus bar 4, respectively. The value of the detection impedance 6 is the current detectors 9 and 10.
It can be arbitrarily selected according to the value of the secondary winding number.
【００１０】さて図３に示すように、第１の電源１から
第２の電源２に向かって電流Ｉが流れているとき、検出
用インピーダンスに流れる電流をＩR 、接続部よりも第
２の電源２側の母線４に流れる電流をＩ’とする。この
とき電流検出器９の検出電流をＩC1、電流検出器10の検
出電流をＩC2とすると、電流検出器９にはＩ’とＩRと
が同一方向に流れるから、ＩC1＝Ｉ’＋ＩR ＝Ｉであ
る。しかし電流検出器10にはＩとＩR とが反対方向に流
れるので、ＩC2＝Ｉ−ＩR となる。As shown in FIG. 3, when the current I is flowing from the first power source 1 to the second power source 2, the current flowing through the impedance for detection is I R , which is second to the connecting portion. The current flowing through the bus bar 4 on the power supply 2 side is I '. At this time, if the detection current of the current detector 9 is I C1 and the detection current of the current detector 10 is I C2 , I ′ and I R flow in the same direction in the current detector 9, so I C1 = I ′ + I R = I. However, since the current detector 10 and the I and I R flowing in the opposite direction and I C2 = I-I R.
【００１１】このため、第１の電源１から第２の電源２
に向かって電流Ｉが流れているときには必ずＩC1がＩC2
よりも大きくなる。なお、電流が交流であって正負が逆
転してもこの関係が成立するので、ＩC1とＩC2の大きさ
を図示を略した判別回路により判別すれば、電流Ｉの方
向を検出することができる。Therefore, the first power source 1 to the second power source 2
When the current I is flowing toward, I C1 must be I C2
Will be larger than. Note that this relationship holds even when the current is alternating current and the positive and negative polarities are reversed, so the direction of the current I can be detected by determining the magnitudes of I C1 and I C2 by a determination circuit (not shown). it can.
【００１２】またこれとは逆に、図４に示すように第２
の電源２から第１の電源１に向かって電流Ｉが流れてい
る場合には、（符号を図３と同一とすると）電流検出器
９にはＩ’とＩR とが反対方向に流れ、電流検出器10に
はＩとＩR とが同一方向に流れる。このため、ＩC1＝
Ｉ’−ＩR ＝Ｉとなり、ＩC2＝Ｉ＋ＩR となる。なおこ
の場合にも、電流が交流であって正負が逆転してもこの
関係を成立する。従ってこの場合には必ずＩC1がＩC2よ
りも小さくなる。そこでＩC1とＩC2の大きさを図示を略
した判別回路により判別すれば、電流Ｉの方向を検出す
ることができる。On the contrary, as shown in FIG.
When the current I is flowing from the power supply 2 to the first power supply 1, the current detector 9 (when the reference numerals are the same as those in FIG. 3) have I ′ and I R flowing in opposite directions, It flows in the same direction as I and I R is the current detector 10. Therefore, I C1 =
I'-I R = I, and becomes the I C2 = I + I R. Even in this case, this relationship holds even if the current is alternating current and the positive and negative polarities are reversed. Therefore, in this case, I C1 is always smaller than I C2 . Therefore, the direction of the current I can be detected by discriminating the magnitudes of I C1 and I C2 by a discriminating circuit (not shown).
【００１３】[0013]
【発明の効果】以上に説明したように、本発明によれば
２個の電流検出器の検出電流の大小を判別するだけで、
電力潮流の方向を正確に検出することができる。このた
め、従来のような回路構成が複雑な方向継電器を必要と
せず、簡便に潮流検出を行うことができる利点がある。As described above, according to the present invention, it is only necessary to determine the magnitude of the detected current of the two current detectors.
It is possible to accurately detect the direction of the power flow. Therefore, there is an advantage that it is possible to easily detect the power flow without requiring a directional relay having a complicated circuit configuration as in the related art.
【図１】負荷に複数の電源が接続された電力系統を示す
回路図である。FIG. 1 is a circuit diagram showing a power system in which a plurality of power sources are connected to a load.
【図２】本発明の潮流検出回路を示す回路図である。FIG. 2 is a circuit diagram showing a power flow detection circuit of the present invention.
【図３】本発明の潮流検出回路の検出原理を説明する回
路図である。FIG. 3 is a circuit diagram illustrating the detection principle of the power flow detection circuit of the present invention.
【図４】本発明の潮流検出回路の検出原理を説明する回
路図である。FIG. 4 is a circuit diagram illustrating the detection principle of the power flow detection circuit of the present invention.
１ 第１の電源 ２ 第２の電源 ３ 負荷 ４ 母線 ５ 観測点 ６ 検出用インピーダンス ７ 検出用インピーダンスのリード線 ８ 検出用インピーダンスのリード線 ９ 電流検出器 10 電流検出器 1 1st power supply 2 2nd power supply 3 Load 4 Busbar 5 Observation point 6 Detection impedance 7 Detection impedance lead wire 8 Detection impedance lead wire 9 Current detector 10 Current detector
Claims (1)
のための潮流検出回路であって、電源と負荷との間に負
荷と並列に検出用インピーダンスを設け、その２本のリ
ード線の母線との接続部を互いに反対方向に折り曲げ、
それぞれの折り曲げ部と母線との外周に電流検出器を取
り付けたことを特徴とする潮流検出回路。1. A power flow detection circuit for a power system in which a plurality of power sources are connected to a load, wherein a detection impedance is provided in parallel with the load between the power source and the load, and Bend the connection with the bus bar in the opposite direction,
A power flow detection circuit characterized in that a current detector is attached to the outer periphery of each bent portion and the bus bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6248997A JPH08114633A (en) | 1994-10-14 | 1994-10-14 | Power flow detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6248997A JPH08114633A (en) | 1994-10-14 | 1994-10-14 | Power flow detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08114633A true JPH08114633A (en) | 1996-05-07 |
Family
ID=17186480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6248997A Withdrawn JPH08114633A (en) | 1994-10-14 | 1994-10-14 | Power flow detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08114633A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2648007A4 (en) * | 2010-11-30 | 2017-01-04 | Omron Corporation | Detection device and method, and program |
-
1994
- 1994-10-14 JP JP6248997A patent/JPH08114633A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2648007A4 (en) * | 2010-11-30 | 2017-01-04 | Omron Corporation | Detection device and method, and program |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020115 |