JP3330339B2 - Distribution line carrier signal receiving circuit - Google Patents
Distribution line carrier signal receiving circuitInfo
- Publication number
- JP3330339B2 JP3330339B2 JP37292498A JP37292498A JP3330339B2 JP 3330339 B2 JP3330339 B2 JP 3330339B2 JP 37292498 A JP37292498 A JP 37292498A JP 37292498 A JP37292498 A JP 37292498A JP 3330339 B2 JP3330339 B2 JP 3330339B2
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- Japan
- Prior art keywords
- phase
- signal
- distribution line
- carrier signal
- reception
- 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.)
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Description
【0001】[0001]
【発明の属する技術分野】本発明は、三相配電線路を搬
送信号の伝送線路とし、データにより変調された搬送信
号を商用周波に重畳させてデータの伝送を行い、配電系
統における各種の監視・制御・計測を行う、配電線搬送
方式における配電線搬送信号受信回路の改良に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase distribution line which is used as a transmission line for a carrier signal, and superimposes a carrier signal modulated by data on a commercial frequency to transmit data. The present invention relates to an improvement of a distribution line carrier signal receiving circuit in a distribution line carrier system that performs control and measurement.
【0002】[0002]
【従来の技術】図4は、従来の配電線搬送信号送信回路
および同受信回路における信号注入方式および信号検出
方式を示す図である。2. Description of the Related Art FIG. 4 is a diagram showing a signal injection system and a signal detection system in a conventional distribution line carrier signal transmission circuit and a conventional distribution line transmission circuit.
【0003】図4(a)に示すように、従来、三相高圧
配電線路における配電線搬送方式においては、送信側で
は、通信線からの制御信号によって三相インバータ11
に変調された搬送信号を生成させ、三相カプラ12を介
して、三相高圧配電線路Lの全相に対してSU ,SV ,
SW として注入し、受信側では、検出回路13が三相の
うち任意の一相から受信信号の検出を行う。図4(a)
では、受信信号をV相から検出し、検出回路13のDV
〜COM端子間から出力する例として示している。な
お、図4(a)の受信側における受信信号の検出は、図
5の各種検出回路に示すように、コンデンサにより分圧
を行うPD(ポテンシャルデバイダ、図5(a))を使
用した例として示しているが、星形結線のVT(ボルテ
ージトランス、図5(b))やCT(カレントトラン
ス、図5(c))によっても可能である。なお、この場
合の送受信信号ベクトルは、図4(b)に示すように、
SU ,SV ,SW が振幅が同じで位相がそれぞれ120
°異なるものとなることから、受信側では何れの相から
も確実な信号の検出が可能となる。As shown in FIG. 4 (a), in a conventional distribution line transport system in a three-phase high-voltage distribution line, the transmission side uses a control signal from a communication line to control the three-phase inverter 11 on the transmission side.
To produce a modulated carrier signal, via a three-phase coupler 12, S U for all phases of the three-phase high voltage distribution line L, S V,
It was injected as S W, the receiving side, detection circuit 13 performs detection of the received signal from any one phase among the three phases. FIG. 4 (a)
Then, the received signal is detected from the V phase, and D V of the detection circuit 13 is detected.
It is shown as an example of outputting from between the terminals .about.COM. The detection of the received signal on the receiving side in FIG. 4A is performed by using a PD (potential divider, FIG. 5A) that performs voltage division by a capacitor as shown in various detection circuits in FIG. Although shown, it is also possible to use a star-connected VT (voltage transformer, FIG. 5B) or CT (current transformer, FIG. 5C). Note that the transmission / reception signal vector in this case is, as shown in FIG.
S U, S V, S W is the same amplitude and phase, respectively 120
°, the receiving side can reliably detect a signal from any phase.
【0004】検出された受信信号は、バンドパスフィル
タ14において所要の周波数帯域の搬送信号のみを通過
させた後、検波回路15において、再びデータ信号Sと
して取り出される。なお、COMは検出回路13の共通
端子、DV は検出回路13のV相の検出端子、Tは変電
所の変圧器である。The detected reception signal passes only a carrier signal of a required frequency band in the band-pass filter 14, and is again taken out as a data signal S in the detection circuit 15. Incidentally, COM common terminal, the detection terminals, T of V-phase D V detection circuit 13 of the detection circuit 13 is a transformer substation.
【0005】[0005]
【発明が解決しようとする課題】近年、配電線搬送シス
テムに用いられるインバータ(変調機能を含むもの)や
信号結合回路などの装置に対しても、小型化、低コスト
化が要求されるようになり、送信側において単相インバ
ータを使用する単相線間注入方式が指向されるようにな
っており、図6に単相線間注入方式の一例を示す。図6
(a)は三相高圧配電線路Lに対する搬送信号の送信回
路および受信回路の接続を示す図であり、図6(b)は
単相線間注入方式における受信信号ベクトル図である。In recent years, miniaturization and cost reduction have been demanded for devices such as an inverter (including a modulation function) and a signal coupling circuit used in a distribution line conveying system. Thus, a single-phase line injection method using a single-phase inverter is adopted on the transmission side. FIG. 6 shows an example of a single-phase line injection method. FIG.
FIG. 6A is a diagram illustrating connection of a transmission circuit and a reception circuit of a carrier signal to the three-phase high-voltage distribution line L, and FIG. 6B is a reception signal vector diagram in the single-phase line injection system.
【0006】単相線間注入方式を採用する場合、搬送信
号の送信点は複数存在するから、それぞれの送信点にお
ける注入相は不定であり(図6(a)では、UW相に注
入)、したがって、受信側では、単相のみの検出(図6
(a)では、V相の単相検出)では受信できない場合が
発生するので、三相星形結線のうち二相から信号を検出
して、送受信間の相関係に依ることなく信号を確実に受
信できるようにする必要がある。図6(a)では、U相
とW相とから信号を検出する例として示している。しか
し、本方式の場合は、注入相がどれかによって受信信号
を何れか一相のみで検出する場合と、二相共に検出する
場合とが生じるので、相毎に受信回路を具備するか、ま
たは、二相の受信信号を合成して受信することが必要と
なる。In the case of adopting the single-phase line injection method, since there are a plurality of transmission points of the carrier signal, the injection phase at each transmission point is undefined (in FIG. 6A, the injection phase is injected into the UW phase). Therefore, on the receiving side, detection of only a single phase (FIG. 6)
In (a), a case may occur in which the signal cannot be received by V-phase single-phase detection). Therefore, signals are detected from two phases of the three-phase star connection, and the signal is reliably detected without depending on the phase relationship between transmission and reception. Need to be able to receive. FIG. 6A shows an example in which a signal is detected from the U phase and the W phase. However, in the case of the present method, the case where the received signal is detected in only one of the phases depending on the injected phase and the case where both the two phases are detected occur, so that a receiving circuit is provided for each phase, or , It is necessary to combine and receive two-phase reception signals.
【0007】後者の場合の受信装置の構成は、図6
(a)に示すような、検出回路16で受信した二相の受
信信号のうち一相の受信信号を反転加算回路17におい
て反転した後加算合成し、その結果をバンドパスフィル
タ18において所要の周波数帯域の搬送信号のみを通過
させた後、検波回路19においてデータ信号Sとして取
り出す方式となる。なお、図6(a)において、20は
単相インバータ、21は単相カプラ、COMは検出回路
16の共通端子、DU は同じくU相の検出端子、D W は
同じくW相の検出端子、Tは変電所の変圧器である。ま
た、受信信号ベクトルは、図6(b)に示すような、振
幅が同一で位相がそれぞれ180°異なるものとなる。The configuration of the receiving device in the latter case is shown in FIG.
(A) As shown in FIG.
The one-phase received signal among the received signals is sent to the inverting and adding circuit 17.
After adding and combining, the result is bandpass-filled.
Pass only the carrier signal of the required frequency band
After that, the detection circuit 19 captures the data signal S.
System. In FIG. 6A, reference numeral 20 denotes
Single-phase inverter, 21 is a single-phase coupler, COM is a detection circuit
16 common terminals, DU Is the U-phase detection terminal, W Is
Similarly, a W-phase detection terminal and T is a transformer of a substation. Ma
The received signal vector has an amplitude as shown in FIG.
The widths are the same and the phases differ by 180 °.
【0008】図7は、図6に示す単相線間注入方式にお
ける受信信号検出状態を示す図であり、図7により送信
側の注入相と受信側の検出相との関係を説明する。図5
に示すように、たとえば、受信側において三相のうち、
U相およびW相の二相から受信信号を検出するようにし
ている場合は、送信側において搬送信号がUV相に単相
注入されるとすると、図7(a)に示すように、受信側
ではSU (+)を受信する。次に、送信側において信号
がVW相に単相注入されるとすると、図7(b)に示す
ように、受信側ではSW (−)を受信する。なお、SU
(+)とSW (−)の振幅は同一である。さらに、送信
側において搬送信号がUW相に単相注入されるとする
と、図7(c)に示すように、受信側ではSU (+)お
よびSW (−)を受信する。ここで、図7(c)のよう
な場合を想定して一相の検出信号を反転して加算する
と、図7(d)のように二相受信の場合は一相受信の場
合に比較して受信信号レベルに差異を生じるので、何ら
かの修正が必要となる。FIG. 7 is a diagram showing a detection state of a received signal in the single-phase line injection system shown in FIG. 6. The relationship between the injection phase on the transmission side and the detection phase on the reception side will be described with reference to FIG. FIG.
For example, as shown in FIG.
In the case where the reception signal is detected from two phases of the U phase and the W phase, assuming that the carrier signal is injected into the UV phase in a single phase on the transmission side, as shown in FIG. Then, S U (+) is received. Next, assuming that a signal is injected into the VW phase in a single phase on the transmitting side, the receiving side receives SW (−) as shown in FIG. 7B. Note that S U
The amplitudes of (+) and SW (-) are the same. Further, assuming that the carrier signal is injected into the UW phase in a single phase on the transmitting side, the receiving side receives S U (+) and S W (−) as shown in FIG. 7C. Here, assuming the case as shown in FIG. 7 (c), when the one-phase detection signal is inverted and added, the two-phase reception is compared with the one-phase reception as shown in FIG. 7 (d). Therefore, a difference is required in the received signal level, so that some correction is required.
【0009】以上のように、相毎に検出回路を具備すれ
ばコストが割高となり、また、二相の信号を合成して受
信する場合は、単純な信号の反転および合成では受信相
の数によって受信信号のレベルが異なる結果を招き、配
電線搬送信号受信回路におけるダイナミックレンジの設
計および信号レベルの計測上の不都合が生じる。 (発明の目的)本発明の目的は、上述の課題を解決し、
受信側の回路を増加させることなく小型化を図るととも
に、送受信間の相関係に制約を受けない単相線間注入方
式の配電線搬送信号受信回路を提供することである。As described above, if a detection circuit is provided for each phase, the cost will be relatively high. In addition, when two-phase signals are combined and received, simple signal inversion and combination depend on the number of reception phases. As a result, the level of the received signal is different, which causes inconvenience in designing the dynamic range and measuring the signal level in the distribution line carrier signal receiving circuit. (Object of the Invention) The object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a distribution line carrier signal receiving circuit of a single-phase line injection system, which is reduced in size without increasing the number of circuits on the receiving side and is not restricted by the phase relationship between transmission and reception.
【0010】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、送信側では三相配電線路のうちのいずれ
か一相の線間に搬送信号を注入し、受信側では前記三相
配電線路のうちの二相で受信信号を検出し、検出した受
信信号から前記搬送信号を分離し、検波するようにした
配電線搬送信号受信回路であって、検出した二相の受信
信号のうちの一相の受信信号の位相を60度遅延させ、
他の一相の受信信号と加算することにより、受信信号を
合成するようにしたことを特徴とするものである。In order to achieve the above-mentioned object, the present invention provides a method for injecting a carrier signal between any one of three-phase distribution lines on a transmitting side and a method for injecting a carrier signal on a receiving side. Detecting a received signal in two phases of the phase distribution line, separating the carrier signal from the detected received signal, a distribution line carrier signal receiving circuit to detect, the detected two-phase received signal Delay the phase of one phase of the received signal by 60 degrees,
The reception signal is synthesized by adding the reception signal to another one-phase reception signal.
【0011】[0011]
【発明の実施の形態】図1は、本発明の実施の一形態を
示す、配電線搬送信号受信回路の一例を示す図である。FIG. 1 is a diagram showing an example of a distribution line carrier signal receiving circuit according to an embodiment of the present invention.
【0012】図1に示すように、三相高圧配電線路Lの
送信側において単相線間注入された搬送信号を検出する
ため、たとえば、検出回路1においてU相およびW相の
二相(星形結線)から受信信号SU およびSW を検出
し、W相の受信信号SW の位相を60°位相遅延回路2
により信号中心周波数において60°遅延させて、加算
回路3でU相の受信信号SU と加算し、バンドパスフィ
ルタ4において所要の周波数帯域の搬送信号のみを通過
させた後、検波回路5においてデータ信号Sとして取り
出す。なお、COMは検出回路1の共通端子、DU は同
じくU相の検出端子、DW は同じくW相の検出端子であ
る。As shown in FIG. 1, in order to detect a carrier signal injected between single-phase lines on the transmitting side of a three-phase high-voltage distribution line L, for example, in a detection circuit 1, two phases of U-phase and W-phase (star detects the reception signal S U and S W from the shape connection), the phase of the 60 ° phase of the received signal S W of the W-phase delay circuit 2
The signal is delayed by 60 ° at the signal center frequency, added to the U-phase reception signal S U by the addition circuit 3, passed only by the carrier signal of the required frequency band in the band-pass filter 4, Extracted as signal S. Incidentally, COM common terminal, D U is also detected terminal, D W of the U-phase of the detection circuit 1 is a detection terminal of the same W-phase.
【0013】図2は、図1のように構成した配電線搬送
信号受信回路における、受信信号ベクトルを示す図であ
る。FIG. 2 is a diagram showing a received signal vector in the distribution line carrier signal receiving circuit configured as shown in FIG.
【0014】図2(a)に示すように、送信側において
UV相に注入された搬送信号に対しては、受信側ではU
相のみの一相に受信信号SU (+)が検出され、また、
図2(b)に示すように、送信側においてVW相に注入
された搬送信号に対しては、受信側ではW相のみの一相
に受信信号SW (−)が検出され、それらの位相は異な
るが振幅は同一である。As shown in FIG. 2A, for the carrier signal injected into the UV phase on the transmitting side, U
The received signal S U (+) is detected in one phase only, and
As shown in FIG. 2B, with respect to the carrier signal injected into the VW phase on the transmission side, the reception signal SW W (-) is detected on the reception side only in the W phase, and these phases are detected. But the amplitude is the same.
【0015】次に、送信側でWU相に搬送信号が単相注
入された場合は、図2(c)に示すように、受信側では
W相に受信信号SW (+)、U相に受信信号SU (−)
が、それぞれ180°位相を異にして検出される。この
ように三相のうちの二相から信号が検出される場合、U
相の信号SU (−)の位相を60°遅延させて信号S
U ’を生成し、これをW相の信号SW (+)に加算合成
するとSW +SU ’ が得られるが、図2(c)に示す
ように、この信号SW +SU ’の振幅は上述の一相での
み受信した場合の信号と同一の大きさとなる。Next, on the transmitting side, the carrier signal is applied to the WU phase in a single-phase mode.
In the case of receiving, as shown in FIG.
Received signal S in W phaseW (+), Received signal S in U phaseU (-)
Are detected with a 180 ° phase difference. this
If a signal is detected from two of the three phases,
Phase signal SU The signal S with the phase of (−) delayed by 60 °
U ′ Is generated and the W-phase signal SW Addition synthesis to (+)
Then SW + SU ′ Is obtained, as shown in FIG.
So, this signal SW + SU ’Amplitude in one phase
Only when the signal is received.
【0016】図3は、送信側における搬送信号の注入相
と、受信側における受信信号の検出相との各関係におけ
る合成受信信号を示す図であり、図3から明らかなよう
に、上述の受信信号の検出は送受信側における相関係に
よらず同様であり、すなわち、送信側で三相配電線に単
相線間注入された搬送信号を、受信側で二相から受信信
号を検出する場合においても、一相からのみ受信信号が
受信される場合の信号レベルと常に同一の振幅で受信信
号を受信することができ、単相線間注入を採用する配電
線搬送方式の場合、受信側で星形結線の任意の二相から
受信信号を検出することにより、送受信間の相関係に依
らず、常に同一レベルの受信信号を受信することができ
る。FIG. 3 is a diagram showing a composite reception signal in each relationship between the injection phase of the carrier signal on the transmission side and the detection phase of the reception signal on the reception side. As is clear from FIG. The detection of the signal is the same regardless of the phase relationship on the transmitting and receiving sides, that is, the carrier signal injected between the single-phase lines on the three-phase distribution line on the transmitting side, and the receiving signal is detected from the two phases on the receiving side. In the case of a distribution line transport system that can receive a received signal with the same amplitude as the signal level when the received signal is received only from one phase and uses single-phase line injection, a star By detecting a reception signal from any two phases of the connection, a reception signal of the same level can be always received regardless of the phase relationship between transmission and reception.
【0017】[0017]
【発明の効果】以上説明したように、本発明によれば、
受信側の回路を増加させることなく小型化を図るととも
に、送信側が単相線間注入方式であっても送受信間の相
関係に制約を受けない配電線搬送信号受信回路を提供す
ることができる。As described above, according to the present invention,
It is possible to provide a distribution line carrier signal receiving circuit that can be downsized without increasing the number of circuits on the receiving side and that is not restricted by the phase relationship between transmission and reception even when the transmitting side is a single-phase line injection system.
【図1】本発明の実施の一形態を示す、配電線搬送信号
受信回路の一例を示す図である。FIG. 1 is a diagram illustrating an example of a distribution line carrier signal receiving circuit according to an embodiment of the present invention.
【図2】図1の配電線搬送信号受信回路における、受信
信号ベクトルを示す図である。FIG. 2 is a diagram showing a received signal vector in the distribution line carrier signal receiving circuit of FIG. 1;
【図3】送信側における信号の注入相と、受信側におけ
る信号の検出相との各関係における合成受信信号を示す
図である。FIG. 3 is a diagram illustrating a combined reception signal in each relationship between an injection phase of a signal on a transmission side and a detection phase of a signal on a reception side.
【図4】従来の配電線搬送信号送信回路および同受信回
路における、信号注入方式および信号検出方式を示す図
である。FIG. 4 is a diagram illustrating a signal injection method and a signal detection method in a conventional distribution line carrier signal transmission circuit and a conventional distribution line transmission circuit.
【図5】各種の検出回路を示す図である。FIG. 5 is a diagram showing various detection circuits.
【図6】三相配電線路に対する、単相線間注入方式の搬
送信号の送信回路および受信回路の接続の従来例を示す
図である。FIG. 6 is a diagram showing a conventional example of connection between a transmission circuit and a reception circuit of a carrier signal of a single-phase line injection system to a three-phase distribution line.
【図7】図6の単相線間注入方式における受信信号検出
状態を示す図である。FIG. 7 is a diagram showing a received signal detection state in the single-phase line injection method of FIG. 6;
1 検出回路 2 60°位相遅延回路 3 加算回路 4 バンドパスフィルタ 5 検波回路 11 三相インバータ 12 三相カプラ 13 検出回路 14 バンドパスフィルタ 15 検波回路 16 検出回路 17 反転加算回路 18 バンドパスフィルタ 19 検波回路 20 単相インバータ 21 単相カプラ COM 検出回路の共通端子 DU 検出回路のU相の検出端子 DV 検出回路のV相の検出端子 DW 検出回路のW相の検出端子 L 三相高圧配電線路 S データ信号 SU U相の受信信号 SU ’ U相の受信信号を60°遅延させた信号 SV V相の受信信号 SW W相の受信信号 T 変電所の変圧器Reference Signs List 1 detection circuit 2 60 ° phase delay circuit 3 addition circuit 4 bandpass filter 5 detection circuit 11 three-phase inverter 12 three-phase coupler 13 detection circuit 14 bandpass filter 15 detection circuit 16 detection circuit 17 inverting addition circuit 18 bandpass filter 19 detection Circuit 20 Single-phase inverter 21 Single-phase coupler COM Common terminal of detection circuit D U- phase detection terminal of U detection circuit D-phase detection terminal of V V detection circuit D-phase detection terminal of W detection circuit L Three-phase high-voltage distribution Line S Data signal S U U-phase reception signal S U 'U-phase reception signal delayed by 60 ° S V V-phase reception signal SW W-phase reception signal T Transformer at substation
Claims (1)
か一相の線間に搬送信号を注入し、受信側では前記三相
配電線路のうちの二相で受信信号を検出し、検出した受
信信号から前記搬送信号を分離し、検波するようにした
配電線搬送信号受信回路であって、検出した二相の受信
信号のうちの一相の受信信号の位相を60度遅延させ、
他の一相の受信信号と加算することにより、受信信号を
合成するようにしたことを特徴とする配電線搬送信号受
信回路。1. A transmitting side injects a carrier signal between any one phase of three-phase distribution lines, and a receiving side detects a reception signal in two phases of the three-phase distribution lines, and detects the signal. A distribution line carrier signal receiving circuit that separates the carrier signal from the received signal and detects the delay, delaying the phase of one phase of the detected two-phase received signal by 60 degrees,
A distribution line carrier signal receiving circuit, wherein the received signal is synthesized by adding the received signal to another one-phase received signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP37292498A JP3330339B2 (en) | 1998-12-28 | 1998-12-28 | Distribution line carrier signal receiving circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP37292498A JP3330339B2 (en) | 1998-12-28 | 1998-12-28 | Distribution line carrier signal receiving circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000196508A JP2000196508A (en) | 2000-07-14 |
JP3330339B2 true JP3330339B2 (en) | 2002-09-30 |
Family
ID=18501270
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP37292498A Expired - Fee Related JP3330339B2 (en) | 1998-12-28 | 1998-12-28 | Distribution line carrier signal receiving circuit |
Country Status (1)
Country | Link |
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JP (1) | JP3330339B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US8265197B2 (en) * | 2009-08-03 | 2012-09-11 | Texas Instruments Incorporated | OFDM transmission methods in three phase modes |
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1998
- 1998-12-28 JP JP37292498A patent/JP3330339B2/en not_active Expired - Fee Related
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JP2000196508A (en) | 2000-07-14 |
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