JP3030813B2 - Standalone operation detection device for private power generation equipment - Google Patents
Standalone operation detection device for private power generation equipmentInfo
- Publication number
- JP3030813B2 JP3030813B2 JP10144938A JP14493898A JP3030813B2 JP 3030813 B2 JP3030813 B2 JP 3030813B2 JP 10144938 A JP10144938 A JP 10144938A JP 14493898 A JP14493898 A JP 14493898A JP 3030813 B2 JP3030813 B2 JP 3030813B2
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- Prior art keywords
- current
- private
- detector
- power
- phase
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は電力需要家に設備さ
れた自家用発電設備の単独運転検出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 isolated operation detection device for a private power generation facility installed in a power consumer.
【０００２】[0002]
【従来の技術】近年、電力を大量に消費する需要家にお
いては、所内の電力を節約し、また非常停電等の発生時
に所内に電力を供給するために自家用発電機を設置し、
電力会社から一定の電力の供給を受けながら、自家用発
電機で発生した安価な電力を所内の自家用負荷に供給す
る自家用発電設備が盛んに設置されつつある。この自家
用発電設備と電力会社の電力供給側系統は、「系統連系
技術用件ガイドライン」に添って安全を維持するための
必要な対策が設けられ、自家用発電設備内故障や電力供
給側故障等の発生時には各種の保護装置により負荷側の
機器類の損失を防止し、早急な故障回復に務めている。2. Description of the Related Art In recent years, consumers who consume a large amount of electric power have installed private power generators to save electric power in the office and to supply electric power to the office when an emergency power failure or the like occurs.
2. Description of the Related Art Private power generation facilities for supplying inexpensive power generated by a private power generator to a private load in a facility while receiving a constant supply of power from a power company are being actively installed. The private power generation equipment and the power supply system of the electric power company are provided with necessary measures to maintain safety in accordance with the “Guidelines for System Interconnection Technology”, such as failures in private power generation equipment and power supply side failures. In the event of a failure, various protection devices prevent the loss of equipment on the load side, and are working to quickly recover from a failure.
【０００３】しかし、近年、電力供給側において、新エ
ネルギー等分散型電源から余剰電力を積極的に購入する
ように法規が改正され、自家用発電設備においても一定
の条件のもとで電力供給側への連系に応じて余剰電力の
販売が可能になり、逆潮流防止装置を装備する必要がな
くなりつつある。しかしながら、自家用発電機の余剰電
力を電力供給側に供給できるように逆潮流が許容された
設備において、電力供給側が不健全状態にあるか否か、
即ち電力会社の発電所側の遮断器が開路されているか、
或いは配電線が断線しているか否かを自家用発電設備側
で検出することができず、配電線の故障等により電力供
給側の各遮断器が開路した状態で自家用発電設備側の連
系遮断器が閉路して自家用発電設備が単独運転すると、
電力供給側の故障した配電線に自家用発電機の電圧が印
加されて配電線の保守点検、復旧作業等が危険となると
いう問題があった。However, in recent years, laws and regulations have been amended on the power supply side to actively purchase surplus power from distributed power sources such as new energy, and even private power generation facilities have been changed to the power supply side under certain conditions. As a result, surplus electric power can be sold according to the interconnection, and it is no longer necessary to provide a reverse power flow prevention device. However, in a facility in which reverse power flow is allowed so that the surplus power of the private generator can be supplied to the power supply side, whether the power supply side is in an unhealthy state,
That is, whether the circuit breaker on the power station side of the power company is open,
Alternatively, it is not possible to detect whether the distribution line is disconnected or not on the private power generation equipment side, and the interconnecting circuit breaker on the private power generation equipment side in a state where each breaker on the power supply side is opened due to a failure of the distribution line or the like. Is closed and the private power plant operates alone,
There is a problem that the voltage of the private generator is applied to the faulty distribution line on the power supply side, and maintenance and inspection of the distribution line, restoration work, and the like become dangerous.
【０００４】そこで、電力供給側が不健全状態で自家用
発電設備の連系遮断器に正確に開路して各種事故の発生
を防止できるようにするために、電力供給側に連系され
た自家用発電設備側から電力供給側が不健全で自家用発
電設備が単独運転していることを容易に検出できる装置
が要望されている。[0004] In order to prevent the occurrence of various accidents by accurately opening the circuit breaker of the private power generation facility when the power supply side is in an unhealthy state, the private power generation facility connected to the power supply side is required. There is a demand for a device that can easily detect that the power supply side is unhealthy and the private power generation facility is operating alone.
【０００５】[0005]
【発明が解決すしようとする課題】本発明は上記問題点
に鑑みなされたもので、電力供給側に連系された自家用
発電設備側から電力供給側が不健全状態で自家用発電設
備が単独運転していることを容易に検出でき、電力供給
側が不健全状態の場合に自家用発電設備の連系遮断器を
正確に開路して各種事故の発生を防止できるようにした
自家用発電設備の単独運転検出装置を提供することを目
的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has a problem in that a private power generator is operated in an unhealthy state from a private power generator connected to a power supply side. Operation detection device for private power generation equipment, which can easily detect that the power supply side is in an unhealthy state and accurately open the circuit breaker of the private power generation equipment to prevent the occurrence of various accidents The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】本発明の請求項１に係る
自家用発電設備の単独運転検出装置は、電力を供給する
系統電力会社側から配電線を介して電力が供給され、か
つ自家用発電機から主として電力を供給される自家用負
荷を有する自家用発電設備であって、系統電力側の配電
線と自家用発電機との間に設けられている分岐線に設け
られた電流検出器と、分岐線における電流検出器より自
家用発電機側にスイッチを介して接続された抵抗である
検出用インピーダンス負荷と、電流検出器に流れる電流
の位相を検出する位相検出器と、スイッチオフ時の位相
検出器が検出した電流の位相とスイッチオン時の位相検
出器が検出した電流の位相との差が所定の値より大きい
と きは自家用発電設備が系統電力会社側と連系されて健
全な正常な場合と判定する単独運転判定部とを備えてい
る。 According to a first aspect of the present invention, there is provided an apparatus for detecting the isolated operation of a private power generator, which supplies electric power.
If power is supplied from the grid power company via distribution lines,
Private generators, which are mainly supplied with power from private generators
Private power generation equipment with load and distribution on the grid power side
On the branch line between the line and the private generator
Current detector and the current detector in the branch line
This is a resistor connected to the home generator via a switch
Detection impedance load and current flowing through current detector
Phase detector that detects the phase of the
The phase of the current detected by the detector and the phase at switch-on
The difference from the phase of the current detected by the transmitter is larger than the specified value
Doo-out the private power generation equipment is grid power company side and the interconnection Ken
An islanding operation determination unit that determines that the operation is normal.
You.
【０００７】本発明の請求項２に係る自家用発電設備の
単独運転検出装置は、電力を供給する系統電力会社側か
ら配電線を介して電力が供給され、かつ自家用発電機か
ら主として電力を供給される自家用負荷を有する自家用
発電設備であって、系統電力側の配電線と自家用発電機
との間に設けられている分岐線に直列に設けられた第１
及び第２の電流検出器と、分岐線における第１及び第２
の電流検出器の接続点にスイッチを介して接続された抵
抗である検出用インピーダンス負荷と、配電線側の第１
の電流検出器に流れる電流の位相を検出する第１の位相
検出器と、自家用発電機側の第２の電流検出器に流れる
電流の位相を検出する第２の位相検出器と、スイッチオ
フ時の第１又は第２の位相検出器が検出した電流の位相
とスイッチオン時の第１の位相検出器が検出した電流の
位相との差が所定の値より大きいときは自家用発電設備
が系統電力会社側と連系されて健全な正常な場合と判定
し、スイッチオフ時の第１又は第２の位相検出器が検出
した電流の位相とスイッチオン時の第２の位相検出器が
検出した電流の位相との差が所定の値より大きいときは
自家用発電設備が系統電力会社側と連系中に不健全な状
態で自家用発電設備が単独運転している場合と判定する
単独運転判定部とを備えている。According to a second aspect of the present invention, there is provided an islanding operation detection apparatus for a private power generation facility, in which power is supplied from a system power company supplying power via a distribution line, and power is mainly supplied from a private power generator. A private power generation facility having a private load, comprising: a first power generation unit provided in series with a branch line provided between a distribution line on the system power side and a private power generator;
And a second current detector, and first and second current detectors in the branch line.
Resistor which is connected via the switch to the connection point of the current detector
The impedance load for detection, which is a resistance, and the first on the distribution line side.
Phase detecting the phase of the current flowing through the current detector of
Detector and a second current detector on the private generator side
A second phase detector for detecting the phase of the current;
Phase of the current detected by the first or second phase detector at the time of
Of the current detected by the first phase detector when the switch is turned on.
When the difference from the phase is larger than a predetermined value, the private power generation equipment is connected to the grid power company side, and it is determined that the state is sound and normal, and the first or second phase detector at the time of switch-off is detected.
Current phase and the second phase detector at switch on
If the difference from the detected current phase is larger than a predetermined value, it is determined that the private power generation equipment is operating in an unhealthy state while the private power generation equipment is connected to the grid power company side in an unhealthy state. Section.
【０００８】本発明の請求項３に係る自家用発電設備の
単独運転検出装置は、電力を供給する系統電力会社側か
ら配電線を介して電力が供給され、かつ自家用発電機か
ら主として電力を供給される自家用負荷を有する自家用
発電設備であって、系統電力側の配電線と自家用発電機
との間に設けられている分岐線に設けられた電流検出器
と、分岐線における電流検出器より自家用発電機側にス
イッチを介して接続された抵抗である検出用インピーダ
ンス負荷と、電流検出器に流れる電流のピーク値を検出
する電流ピーク値検出器と、スイッチオフ時の電流ピー
ク値検出器が検出した電流のピーク値とスイッチオン時
の電流ピーク値検出器が検出した電流のピーク値との差
が所定の値より大きいときは自家用発電設備が系統電力
側と連系されて健全な正常な場合と判定する単独運転判
定部とを備えている。 [0008] The private power generation equipment according to claim 3 of the present invention.
Is the islanding detection device connected to the grid
Power is supplied via distribution lines and is
For private use with a private load that is primarily powered
Power generation equipment, including distribution lines on the grid power side and private generators
Current detector provided on the branch line provided between
From the current detector on the branch line to the private generator side.
Detector is a resistor connected through a switch
Load and the peak value of the current flowing through the current detector
Current peak value detector and the current peak
Current value detected by the current value detector and when the switch is turned on.
Difference from the current peak value detected by the current peak value detector
Is larger than the specified value, the private power generation
Judgment of islanding operation linked to the
And a fixed part.
【０００９】本発明の請求項４に係る自家用発電設備の
単独運転検出装置は、電力を供給する系統電力会社側か
ら配電線を介して電力が供給され、かつ自家用発電機か
ら主として電力を供給される自家用負荷を有する自家用
発電設備であって、系統電力側の配電線と自家用発電機
との間に設けられている分岐線に直列に設けられた第１
及び第２の電流検出器と、分岐線における第１及び第２
の電流検出器の接続点にスイッチを介して接続された抵
抗である検出用インピーダンス負荷と、配電線側の第１
の電流検出器に流れる電流のピーク値を検出する第１の
電流ピーク値検出器と、自家用発電機側の第２の電流検
出器に流れる電流のピーク値を検出する第２の電流ピー
ク値検出器と、スイッチオフ時の第１又は第２の電流ピ
ーク値検出器が検出した電流のピーク値とスイッチオン
時の第１の電流ピーク値検出器が検出した電流のピーク
値との差が所定の値より大きいときは自家用発電設備が
系統電力側と連系されて健全な正常な場合と判定し、ス
イッチオフ時の第１又は第２の電流ピーク値検出器が検
出した電流のピーク値とスイッチオン時の第２の電流ピ
ーク値検出器が検出した電流のピーク値との差が所定の
値より大きいときは自家用発電設備が系統電力会社側と
連系中に不健全な状態で自家用発電設備が単独運転して
いる場合と判定する単独運転判定部とを備えている。 [0009] The private power generation equipment according to claim 4 of the present invention.
Is the islanding detection device connected to the grid
Power is supplied via distribution lines and is
For private use with a private load that is primarily powered
Power generation equipment, including distribution lines on the grid power side and private generators
And a first line provided in series with a branch line provided between
And a second current detector, and first and second current detectors in the branch line.
Connected via a switch to the current detector connection point
The impedance load for detection, which is a resistance, and the first on the distribution line side.
Detecting the peak value of the current flowing through the current detector of
A current peak value detector and a second current detector on the private generator side.
The second current peak for detecting the peak value of the current flowing through the output device
Value detector and the first or second current pin when the switch is off.
Peak value of current detected by peak value detector and switch on
Of the current detected by the first current peak value detector at the time
If the difference from the value is larger than the predetermined value,
The system is connected to the grid power side, and it is determined that the
The first or second current peak value detector at the time of switch-off is detected.
The peak value of the output current and the second current
The difference between the peak value of the current detected by the
If the value is larger than the value, the private power generation equipment
The private power generation facility operates in an unhealthy state during interconnection.
And an islanding operation judging unit for judging the case.
【００１０】[0010]
【発明の実施の形態】実施の形態１ 図１は本発明の実施の形態１の自家用発電設備の単独運
転検出装置の構成を示す単線結線図、図２は同単独運転
検出装置の分岐線から検出用インピーダンス負荷に流れ
る電流の模式化した波形図、図３は同単独運転検出装置
の分岐線から検出用インピーダンス負荷に流れる電流の
実際の波形図である。図において、１は電力を供給する
系統電力会社、２は系統電力会社１から配電線３を介し
て電力が供給される自家用発電設備、４は系統電力会社
１と配電線３との間に設けられた系統側連系遮断器であ
る。配電線３には複数の一般負荷５が接続されている。
これらの一般負荷５は内部に遮断器や断路器等が接続さ
れて地絡事故等が発生したときに各負荷を配電線３より
分離して危険を防止する。６は自家用発電設備２に設け
られ、配電線３の分岐線Ｐより分岐されている分岐線、
７は分岐線６の分岐点Ｐ側に接続された自家用連系遮断
器、８は分岐線６の端末側に接続された自家用発電機、
９は自家用発電機８に分岐線６を介して接続された自家
用負荷である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a single-line diagram showing the configuration of an isolated operation detection device for a private power generation facility according to Embodiment 1 of the present invention, and FIG. FIG. 3 is a schematic waveform diagram of a current flowing through the detection impedance load, and FIG. 3 is an actual waveform diagram of a current flowing from the branch line of the isolated operation detection device to the detection impedance load. In the figure, 1 is a grid power company that supplies power, 2 is a private power generation facility to which power is supplied from the grid power company 1 via a distribution line 3, and 4 is provided between the grid power company 1 and the distribution line 3. It is a system side interconnection breaker . A plurality of general loads 5 are connected to the distribution line 3.
These general loads 5 are separated from the distribution line 3 to prevent danger when a circuit breaker, disconnector, or the like is connected inside and a ground fault or the like occurs. 6 is provided private power plant 2, the branch line is branched from the branch line P of the distribution line 3,
7 is a private circuit breaker connected to the branch point P side of the branch line 6, 8 is a private generator connected to the terminal side of the branch line 6,
Reference numeral 9 denotes a private load connected to the private generator 8 via the branch line 6.
【００１１】１０、１１は分岐線６に直列に設けられた
第１及び第２の電流検出器（ＣＴ１、ＣＴ２）である。
１２は第１及び第２の電流検出器１０、１１の接続点ａ
に接続されたスイッチ、１３は第１及び第２の電流検出
器１０、１１の接続点ａにスイッチ１２を介して接続さ
れた抵抗、コンデンサ等の検出用インピーダンス負荷、
１４はスイッチ１２のオン時とオフ時の配電線３側（以
下、「系統側」という）の第１電流検出器１０に流れる
電流の位相を検出する第１位相検出器、１５はスイッチ
１２のオン時とオフ時の自家用発電機８側（以下、「発
電機側」という）の第２電流検出器１１に流れる電流の
位相を検出する第２位相検出器、１６は系統側の第１電
流検出器１０に流れる電流のピーク値を検出する第１電
流ピーク値検出器、１７は発電機側の第２電流検出器１
１に流れる電流のピーク値を検出する第２電流ピーク値
検出器、１８は第１及び第２の位相検出器１４、１５と
第１及び第２の電流ピーク値検出器１６、１７に接続さ
れ、これらの検出値から自家用発電設備２の単独運転を
検出する単独運転判定部である。[0011] 10 and 11 are provided in series <br/> first and second current detectors (CT1, CT2) to the branch line 6.
12 a connection point of the first and second current detectors 10, 11 a
The connected switch, 13 is connected via a switch 12 to the connection point a resistance of the first and second current detectors 10 and 11, the detection impedance load such as a capacitor,
Reference numeral 14 denotes a first phase detector for detecting the phase of the current flowing through the first current detector 10 on the distribution line 3 side (hereinafter, referred to as “system side”) when the switch 12 is on and off. A second phase detector for detecting the phase of a current flowing through the second current detector 11 on the private generator 8 side (hereinafter, referred to as “generator side”) when the power is on and off, and 16 is a first current on the system side The first current peak value detector 17 detects the peak value of the current flowing through the detector 10, and 17 is the second current detector 1 on the generator side .
A second current peak value detector 18 for detecting the peak value of the current flowing in 1 is connected to the first and second phase detectors 14 and 15 and the first and second current peak value detectors 16 and 17. And an islanding operation determination unit that detects the islanding operation of the private power generation facility 2 from these detected values.
【００１２】まず、本発明の実施の形態１の自家用発電
設備の単独運転検出装置により自家用発電設備２の単独
運転を検出できる原理の大略を説明する。例えば、自家
用発電設備内２の自家用負荷９が必要とする電力を自家
用発電機８を駆動しながら供給する。そして、自家用負
荷９の電力が自家用発電機８の出力以上に必要となった
ら、不足する電力が系統電力会社１側から自家用連系遮
断器７を経由して自家用負荷９へ供給される。また、自
家用負荷９の負荷容量が減少して自家用発電機８の出力
に余剰電力が発生したら、この余剰電力は自動的に自家
用連系遮断器７より電力供給側である系統電力会社１側
へ逆潮させて余剰電力を系統電力会社１へ販売するもの
である。ところで、自家用発電設備２が系統電力会社１
側と連系されて健全な正常な場合と、系統電力会社１側
と連系中に不健全な状態で自家用発電設備２が単独運転
している場合では、図２に示すように系統電力会社１側
の配電線３と自家用発電機８との間に設けられている分
岐線６に検出用インピーダンス負荷１３を投入すると、
その分岐線６の系統側と発電機側とに流れる電流のピー
ク値と電流波形の位相角がそれぞれ違うことにより、そ
れに基づいて正常な場合か、不健全な状態の単独運転の
場合かを判定するようにしたものである。ここで、系統
電力会社１側と連系中に不健全な状態で自家用発電設備
２が単独運転している場合とは系統電力会社１側に故障
が発生して系統側連系遮断器４が開路されているか、或
いは配電線３が断線している場合をいう。First, an outline of the principle by which the isolated operation of the private power generation facility 2 can be detected by the private operation detection apparatus for private power generation equipment according to the first embodiment of the present invention will be described. For example, the electric power required by the private load 9 in the private power generation facility 2 is supplied while driving the private generator 8. When the power of the private load 9 is required to be higher than the output of the private generator 8, the insufficient power is supplied from the grid power company 1 to the private load 9 via the private interconnection breaker 7. When the load capacity of the private load 9 decreases and surplus power is generated in the output of the private generator 8, the surplus power is automatically transmitted from the private interconnection circuit breaker 7 to the system power company 1 which is the power supply side. The surplus power is sold to the grid power company 1 with a reverse tide. By the way, the private power generation equipment 2 is the grid power company 1
As shown in FIG. 2, in the case where the power generation system is connected to the system and is in a normal state, and in the case where the private power generation facility 2 is operating alone in an unhealthy state during the connection with the system power company 1, as shown in FIG. When the detection impedance load 13 is applied to the branch line 6 provided between the distribution line 3 on the first side and the private generator 8,
By the phase angle of the peak value and the current waveform of a current flowing in the line side of the branch line 6 and the generator side are different, respectively, determine whether the normal case based on that, when the sole operation of the unhealthy state It is something to do. Here, the case where the private power generation facility 2 is operating alone in an unhealthy state during interconnection with the system power company 1 side means that a failure occurs on the system power company 1 side and the system side It means that the circuit is open or the distribution line 3 is disconnected.
【００１３】自家用発電設備が系統電力会社側と連系さ
れて健全な正常の場合に、検出用インピーダンス１３を
投入しないで分岐線６の系統側と発電機側とに流れる電
流を第１及び第２の電流検出器１０と１１とで検出する
と、両者の電流波形は図２の（ａ）の左側に示すように
同一波形である。また、正常な場合で、スイッチ１２を
オンして検出用インピーダンス負荷１３を投入した時
に、分岐線６の系統側と発電機側とに流れる電流を第１
及び第２の電流検出器１０と１１とで検出すると、その
電流波形は図２の（ａ）の右側に示すように、発電機側
の第２の電流検出器１１（ＣＴ２）が検出する電流のピ
ーク値と位相は変化しないが、系統側の第１の電流検出
器１０（ＣＴ１）が検出する電流のピーク値と位相は変
化する（即ち、電流のピーク値が減少すると共に電流の
位相は両者の電流のゼロクロス点を基準にみるとθだけ
進む）ことが分かる。When the private power generation equipment is connected to the grid power company side and is healthy and normal, the current flowing through the branch line 6 on the grid side and the generator side without inputting the detection impedance 13 is first and second. When the currents are detected by the two current detectors 10 and 11, the current waveforms of the two are the same as shown on the left side of FIG. Further, in a normal case, when the switch 12 is turned on and the detection impedance load 13 is turned on, the current flowing through the system side of the branch line 6 and the generator side is changed to the first state.
And upon detecting by the second current detector 10 and 11, current is the current waveform as shown on the right side of FIG. 2 (a), the second current detector 11 on the generator side of (CT2) is detected Does not change, but the peak value and phase of the current detected by the first current detector 10 (CT1) on the system side change (that is, the peak value of the current decreases and the phase of the current changes). It can be seen that the current advances by θ when the zero-cross point of both currents is used as a reference.
【００１４】次に、自家用発電設備が系統電力会社側と
連系中に不健全な状態となって自家用発電設備が単独運
転している場合には、検出用インピーダンス負荷１３を
投入しないで分岐線６の系統側と発電機側とに流れる電
流を第１及び第２の電流検出器１０と１１とで検出する
と、両者の電流波形は図２の（ｂ）の左側に示すように
同一波形である。また、不健全な状態の単独運転の場合
で、スイッチ１２をオンして検出用インピーダンス負荷
１３を投入した時に、分岐線６の系統側と発電機側とに
流れる電流を第１及び第２の電流検出器１０と１１とで
検出すると、その電流波形は図２の（ｂ）の右側に示す
ように、系統側の電流検出器１０（ＣＴ１）が検出する
電流のピーク値と位相は変化しないが、発電機側の電流
検出器１１（ＣＴ２）が検出する電流のピーク値と位相
は変化する（即ち、電流のピーク値が増加すると共に電
流の位相は両者の電流のゼロクロス点を基準にみるとθ
だけ進む）ことが分かっている。従って、第１及び第２
の電流検出器１０、１１で検出した電流のピーク値の変
化をみるか、電流の位相をみることにより、自家用発電
設備が系統電力会社側と連系されて健全な正常な場合と
系統電力会社側と連系中に不健全な状態で自家用発電設
備が単独運転している場合とを判定することができる。Next, in a case where the private power generation equipment is in an unhealthy state while being interconnected with the grid power company side and the private power generation equipment is operating alone, the branch line is supplied without inputting the detection impedance load 13. When the first and second current detectors 10 and 11 detect currents flowing on the system side and the generator side of No. 6, both current waveforms are the same as shown on the left side of FIG. is there. Further, in the case of the isolated operation in an unhealthy state, when the switch 12 is turned on and the detection impedance load 13 is turned on, the current flowing through the system side and the generator side of the branch line 6 is changed to the first and second currents. When the current is detected by the current detectors 10 and 11, the current waveform does not change in phase with the peak value of the current detected by the current detector 10 (CT1) on the system side, as shown on the right side of FIG. However, the peak value and phase of the current detected by the current detector 11 (CT2) on the generator side change (that is, as the peak value of the current increases, the phase of the current is determined based on the zero crossing point of both currents). And θ
Just go forward). Therefore, the first and second
By checking the change in the peak value of the current detected by the current detectors 10 and 11 or by checking the phase of the current, the private power generation equipment is interconnected with the grid power company side and is in a normal state. It is possible to determine that the private power generation facility is operating alone in an unhealthy state during interconnection with the side.
【００１５】次に、本発明の実施の形態１の自家用発電
設備の単独運転検出装置の動作について説明する。ま
ず、スイッチ１２がオフの時の分岐線６に流れる電流を
第１及び第２の電流検出器１０と１１とで検出する。第
１及び第２の位相検出器１４、１５では第１及び第２の
電流検出器１０、１１が検出した電流の位相を検出して
単独運転判定部１７に出力する。また、第１及び第２の
電流ピーク値検出器１６、１７では第１及び第２の電流
検出器１０、１１が検出した電流のピーク値を検出して
単独運転判定部１７に出力する。次に、スイッチ１２を
オン（オン時間は約１／５０秒）して検出用インピーダ
ンス負荷１３を投入した時に、分岐線６に流れる電流を
第１及び第２の電流検出器１０と１１とで検出する。第
１及び第２の位相検出器１４、１５では第１及び第２の
電流検出器１０、１１が検出した電流の位相を検出して
単独運転判定部１７に出力する。また、第１及び第２の
電流ピーク値検出器１６、１７では第１及び第２の電流
検出器１０、１１が検出した電流のピーク値を検出して
単独運転判定部１７に出力する。Next, the operation of the isolated operation detection device for the private power generation equipment according to the first embodiment of the present invention will be described. Ma
The current flowing through the branch line 6 when the switch 12 is off.
Detection is performed by the first and second current detectors 10 and 11. No.
In the first and second phase detectors 14, 15, the first and second phase detectors
Detecting the phase of the current detected by the current detectors 10 and 11
Output to the isolated operation determination unit 17. In addition, the first and second
The first and second currents are detected by the current peak value detectors 16 and 17.
Detecting the peak value of the current detected by the detectors 10 and 11
Output to the isolated operation determination unit 17. Next, when the switch 12 is turned on (the on-time is about 1/50 second) and the detection impedance load 13 is turned on, the current flowing through the branch line 6 is passed through the first and second current detectors 10 and 11. To detect. The first and second phase detectors 14 and 15 detect the phases of the currents detected by the first and second current detectors 10 and 11 and output the detected phases to the isolated operation determination unit 17. Further, the first and second <br/> current peak value detector in the 16 and 17 first and second current detectors 10, 11 detects the peak value of the current detected isolated operation determination unit 17 Output.
【００１６】単独運転判定部１７では、スイッチオフ時
の第１又は第２の位相検出器１４、１５が検出した電流
の位相とスイッチオン時に第１位相検出器１４が検出し
た電流の位相とを比較し、スイッチオフ時の第２位相検
出器１５が検出した電流の位相に対してスイッチオン時
の第１位相検出器１４が検出した電流の位相が進んでい
る状態で、両者の位相差θが所定の位相差θref より大
きいときは自家用発電設備２が系統電力会社１側と連系
されて健全な正常な場合と判定することができる。ま
た、スイッチオフ時の第１又は第２の位相検出器１４、
１５が検出した電流の位相とスイッチオン時に第２位相
検出器１４が検出した電流の位相とを比較し、スイッチ
オフ時の第１位相検出器１４が検出した電流の位相に対
してスイッチオン時の第２位相検出器１５が検出した電
流の位相が進んでいる状態で、両者の位相差θが所定の
位相差θref より大きいときは自家用発電設備２が系統
電力会社１側と連係中に不健全な状態で自家用発電設備
２が単独運転している場合と判定することができる。The isolated operation determining section 17 determines the phase of the current detected by the first or second phase detector 14 or 15 when the switch is off and the phase of the current detected by the first phase detector 14 when the switch is on. When the phase of the current detected by the first phase detector 14 at the time of switch-on is advanced from the phase of the current detected by the second phase detector 15 at the time of switch-off, the phase difference θ Is larger than the predetermined phase difference θref, it is possible to determine that the private power generation facility 2 is connected to the grid power company 1 side and is healthy and normal. Further, the first or second phase detector 14 when the switch is off,
The phase of the current detected by the first phase detector 14 is compared with the phase of the current detected by the second phase detector 14 when the switch is on, and the phase of the current detected by the first phase detector 14 when the switch is off is switched on. In the state where the phase of the current detected by the second phase detector 15 is advanced, if the phase difference θ between the two is larger than the predetermined phase difference θref, the private power generation equipment 2 is disabled while being linked with the grid power company 1 side. It can be determined that the private power generation facility 2 is operating alone in a healthy state.
【００１７】さらに、単独運転判定部１７では、スイッ
チオフ時の第１又は第２の電流ピーク値検出器１６、１
７が検出した電流のピーク値とスイッチオン時に第１電
流ピーク値検出器１６が検出した電流のピーク値とを比
較し、スイッチオフ時の第２電流ピーク値検出器１７が
検出した電流のピーク値に対してスイッチオン時の第１
電流ピーク値検出器１６が検出した電流のピーク値が減
少している状態で、両ピーク値の差Ａが所定の値Ａref
より大きいときは自家用発電設備２が系統電力会社１側
と連系されて健全な正常の場合と判定することができ
る。また、スイッチオフ時の第１又は第２の電流ピーク
値検出器１６、１７が検出した電流のピーク値とスイッ
チオン時に第２電流ピーク値検出器１７が検出した電流
のピーク値とを比較し、スイッチオフ時の第１電流ピー
ク値検出器１６が検出した電流のピーク値に対してスイ
ッチオン時の第２電流ピーク値検出器１６が検出した電
流のピーク値が増加している状態で、両ピーク値の差Ａ
が所定の値Ａref より大きいときは自家用発電設備２が
系統連系中に不健全な状態で自家用発電設備２が単独運
転している場合と判定することができる。Further, in the islanding operation determining section 17, the first or second current peak value detectors 16, 1 at the time of switch-off are provided.
7 is compared with the peak value of the current detected by the first current peak value detector 16 when the switch is turned on, and the peak value of the current detected by the second current peak value detector 17 when the switch is turned off. First value at switch on for value
In a state where the peak value of the current detected by the current peak value detector 16 is decreasing, the difference A between the two peak values is a predetermined value Aref.
If it is larger, the private power generation facility 2 is connected to the grid power company 1 side, and it can be determined that the case is sound and normal. Further, the peak value of the current detected by the first or second current peak value detector 16 or 17 when the switch is off is compared with the peak value of the current detected by the second current peak value detector 17 when the switch is on. In a state where the peak value of the current detected by the second current peak value detector 16 at the time of switch-on is increased with respect to the peak value of the current detected by the first current peak value detector 16 at the time of switch-off, Difference A between both peak values
Is larger than the predetermined value Aref, it can be determined that the private power generating facility 2 is operating alone while the private power generating facility 2 is in an unhealthy state during system interconnection.
【００１８】なお、上述した電流の位相と電流ピーク値
とに基づいて正常な場合と不健全な状態の単独運転の場
合とを判定するのに、スイッチオフ時の電流を用いてい
るのは、スイッチオン時の電流に対してスイッチオフ時
の電流のゼロクロス点を基準に判定するためである。そ
して、この実施の形態１の単独運転判定部１７は、電流
の位相差による判定と電流のピーク値による判定とが同
じときに、それぞれ自家用発電設備２が系統電力会社１
側と連系されて健全な正常の場合と自家用発電設備が系
統電力会社１側と連系中に不健全な状態で自家用発電設
備２が単独運転している場合とに分けて判定する。それ
は、このよに２つの観点から判断した方がより正確に判
定できるからである。従って、このように自家用発電設
備２が系統電力会社１側と連系中に不健全な状態で自家
用発電設備２が単独運転していると判定した場合は、直
ちに自家用発電設備２を系統電力会社１側から分離さ
せ、自家用発電設備２側の機器類の損傷、或いは系統電
力会社１側の配電線３の保守点検時の事故等の各種の事
故の発生を防止することができる。The reason why the current at the time of switch-off is used to judge the normal case and the unsound operation in the unsound state based on the current phase and the current peak value is as follows. This is because the current at the time of switch-on is determined based on the zero cross point of the current at the time of switch-off. When the determination based on the current phase difference and the determination based on the peak value of the current are the same, the isolated operation determination unit 17 of the first embodiment
The determination is made separately for a case where the power generation equipment is connected to the power generation system and is in a normal state, and a case where the power generation equipment for private use is in an unhealthy state while the power generation equipment for private use is connected to the grid power company 1 side. This is because the determination can be made more accurately from two viewpoints. Therefore, when it is determined that the private power generation facility 2 is operating alone in an unhealthy state while the private power generation facility 2 is connected to the grid power company 1 side, the private power generation facility 2 is immediately switched to the grid power company. By separating the power generation equipment 1 from the side, it is possible to prevent various types of accidents, such as damage to the equipment on the private power generation facility 2 side and accidents during maintenance and inspection of the distribution line 3 on the grid power company 1 side.
【００１９】これによって、自家用発電機８は連続運転
しながら設備内の自家用負荷９に電力を供給でき、故障
により系統側連系遮断器４やその他の各遮断器が開路さ
れて無負荷状態の電線路３に自家用発電機８等により電
力が送電されることなく、安全に故障、復旧作業ができ
る。また、配電線３の故障復旧後に直ちに系統電力会社
１側の系統側連系遮断器４を閉路しても、自家用連系遮
断器７が開路されていれば、自家用発電設備２側の機器
類が損傷することなく、自家用発電機８は電圧、周波
数、位相等を同期検定器等で系統電力会社１側と正確に
同期させた後で自家用連系遮断器７を閉路し、連系させ
ながら自家用発電設備２を系統電力会社１側と系統連系
させて通常状態に復帰させるものである。As a result, the private generator 8 can supply electric power to the private load 9 in the facility while operating continuously, and the system-side interconnecting circuit breaker 4 and other circuit breakers are opened due to a failure, and the private generator 9 is in a no-load state. Without power being transmitted to the power line 3 by the private generator 8 or the like, the failure and recovery work can be performed safely. Also immediately it is closed the system side interconnection circuit breaker 4 of the system power company 1 side, shielding private communication system after a failure recovery distribution line 3
If the breaker 7 is open, the equipment on the side of the private power generation facility 2 is not damaged, and the voltage, frequency, phase, etc. of the private generator 8 are accurately synchronized with the system power company 1 side by a synchronization tester or the like. After that, the private power circuit breaker 7 is closed, and the private power generating equipment 2 is connected to the grid power company 1 while being connected to the grid, to return to the normal state.
【００２０】なお、実際はスイッチ１２がオフの場合の
分岐線６における電流のゼロクロス点を基準にスイッチ
１２を一定期間の間オンし、それを周期的に、不定期又
は連続的に１回以上繰り返すようにしている。例えば、
スイッチ１２を１／５０秒間に０．１〜０．２秒間隔で
連続的にオン、オフさせて得られた電流の位相及びピー
ク値を平均して判定することにより、正確に判定できる
ようにしている。また、上述の実施の形態では、単独運
転判定部１７は、電流の位相差による判定と電流のピー
ク値による判定が同じときに、それぞれ自家用発電設備
２が系統電力会社１側と連系されて健全な正常の場合と
自家用発電設備２が系統電力会社１側と連系中に不健全
な状態で自家用発電設備２が単独運転している場合とに
分けて判定するようにしているが、電流の位相差による
判定だけや、電流のピーク値による判定だけでも自家用
発電設備２が系統電力会社１側と連系されて健全な正常
の場合と自家用発電設備２が系統電力会社１側と連系中
に不健全な状態で自家用発電設備２が単独運転している
場合の判定ができることは勿論である。In practice, the switch 12 is turned on for a certain period based on the zero-cross point of the current in the branch line 6 when the switch 12 is off, and this is repeated at least once periodically, irregularly or continuously. Like that. For example,
The switch 12 is continuously turned on and off at intervals of 0.1 to 0.2 seconds in 1/50 second to determine the average and the average of the phase and peak value of the current obtained, so that accurate determination can be made. ing. In the above-described embodiment, the islanding operation determination unit 17 connects the private power generation facility 2 to the grid power company 1 side when the determination based on the current phase difference and the determination based on the peak value of the current are the same. The normal power generation facility 2 and the private power generation facility 2 are operated independently when the private power generation facility 2 is connected to the grid power company 1 in an unhealthy state. The private power generation facility 2 is connected to the grid power company 1 side only when the private power generation facility 2 is connected to the grid power company 1 side, and the private power generation facility 2 is connected to the grid power company 1 side only by the determination based on the phase difference or the peak current value. Of course, it is possible to determine whether the private power generation facility 2 is operating alone in an unhealthy state.
【００２１】[0021]
【発明の効果】以上のように本発明の請求項１によれ
ば、自家用発電設備が電力供給側と連系されている場合
に、系統電力会社側の配電線と自家用発電機との間に設
けられている分岐線におけるそれに設けられた電流検出
器より自家用発電機側と抵抗の検出用インピーダンス負
荷との間に設けられたスイッチをオン、オフしたとき
に、単独運転判定部がスイッチオフ時の位相検出器が検
出した電流の位相とスイッチオン時の位相検出器が検出
した電流の位相との差が所定の位相差より大きいときは
自家用発電設備が系統電力会社側と連系されて健全な正
常の場合と判定することができるので、自家用発電設備
が系統電力会社側と連系されて健全な正常の場合以外は
自家用発電設備が不健全な状態で単独運転していると判
断して直ちに自家用発電設備を系統電力会社側から分離
させ、自家用発電設備側の機器類の損傷、或いは系統電
力会社側の配電線の保守点検時の事故等の各種の事故の
発生を防止できるという効果を有する。 As described above, according to the first aspect of the present invention, when the private power generation equipment is connected to the power supply side.
Between the distribution line of the grid power company and the private generator.
Current detection provided on the branch line
The generator side of the generator and the negative impedance for resistance detection
When the switch provided between the load and the load is turned on or off
The phase detector detects when the islanding operation
The phase of the output current and the phase detector at switch-on are detected
If the difference from the phase of the current
Private power generation facilities are connected to the grid
Because it can be judged that it is always the case, private power generation equipment
Is connected to the grid power company
It is determined that private power generation equipment is operating alone in an unhealthy state.
And immediately separate private power generation equipment from the grid power company
Damage to the equipment on the private power generation equipment side, or
Various types of accidents such as accidents during maintenance and inspection of distribution lines
This has the effect that generation can be prevented.
【００２２】また、本発明の請求項２によれば、自家用
発電設備が電力供給側と連系されている場合に、系統電
力会社側の配電線と自家用発電機との間に設けられてい
る分岐線に直列に設けられた第１及び第２の電流検出器
の接続点と抵抗の検出用インピーダンス負荷との間に設
けられたスイッチをオン、オフしたときに、単独運転判
定部がスイッチオフ時の第１又は第２の位相検出器が検
出した電流の位相とスイッチオン時の第１の位相検出器
が検出した電流の位相との差が所定の位相差より大きい
ときは自家用発電設備が系統電力会社側と連系されて健
全な正常の場合と判定し、またスイッチオフ時の第１又
は第２の位相検出器が検出した電流の位相とスイッチオ
ン時の第２の位相検出器が検出した電流の位相との差が
所定の位相差より大きいときは自家用発電設備が系統電
力会社側と連系中に不健全な状態で自家用発電設備が単
独運転している場合と判定することができるので、自家
用発電設備が不健全な状態で単独運転していると判定し
た場合は直ちに自家用発電設備を系統電力会社側から分
離させ、自家用発電設備側の機器類の損傷、或いは系統
電力会社側の配電線の保守点検時の事故等の各種の事故
の発生を防止できるという効果を有する。According to the second aspect of the present invention, when the private power generation equipment is connected to the power supply side, it is provided between the distribution line on the system power company side and the private power generator. When a switch provided between a connection point of the first and second current detectors provided in series with the branch line and an impedance load for detecting a resistance is turned on and off, the isolated operation determination unit is turned off. The first or second phase detector
Phase of the output current and first phase detector at switch-on
First addition but the difference between the phase of the detected current during a predetermined private power generation equipment is system power company and the communication system determines that the case of the healthy normal is greater than the phase difference, also switched off
Is the phase of the current detected by the second phase detector and
When the difference between the phase of the current detected by the second phase detector and the phase difference is larger than the predetermined phase difference, the private power generation facility is in an unhealthy state during interconnection with the grid power company and the private power generator alone If it is determined that the private power generation equipment is operating alone in an unhealthy state, the private power generation equipment is immediately separated from the grid power company side, and the This has the effect of preventing the occurrence of various accidents such as damage to equipment and accidents during maintenance and inspection of distribution lines on the grid power company side.
【００２３】さらに、本発明の請求項３によれば、自家
用発電設備が電力供給側と連系されている場合に、系統
電力会社側の配電線と自家用発電機との間に設けられて
いる分岐線におけるそれに設けられた電流検出器より自
家用発電機側と抵抗の検出用インピーダンス負荷との間
に設けられたスイッチをオン、オフしたときに、単独運
転判定部がスイッチオフ時の電流ピーク値検出器が検出
した電流のピーク値とスイッチオン時の電流ピーク値検
出器が検出した電流のピーク値との差が所定の値より大
きいときは自家用発電設備が系統電力会社側と連系され
て健全な正常の場合と判定することができるので、自家
用発電設備が系統電力会社側と連系されて健全な正常の
場合以外は自家用発電設備が不健全な状態で単独運転し
ていると判断して直ちに自家用発電設備を系統電力会社
側から分離させ、自家用発電設備側の機器類の損傷、或
いは系統電力会社側の配電線の保守点検時の事故等の各
種の事故の発生を防止できるという効果を有する。 Further, according to claim 3 of the present invention,
System is connected to the power supply side
Installed between the distribution line of the power company and the private generator
From the current detector attached to
Between the home generator and the impedance load for detecting the resistance
When the switch provided in the
The current judgment is detected by the current peak value detector when the switch is turned off.
The peak value of the detected current and the peak current value at switch-on
The difference between the peak value of the current detected by the transmitter and the
At times, private power generation equipment is connected to the grid power company.
Can be determined to be healthy and normal.
Power generation facilities are connected to the grid power company
In other cases, the private power generation equipment operates alone in an unhealthy condition.
Power generation facilities and immediately
From the side, damage to the equipment on the private power generation facility side, or
Or other accidents during maintenance and inspection of distribution lines
This has the effect of preventing the occurrence of any kind of accident.
【００２４】また、本発明の請求項４によれば、自家用
発電設備が電力供給側と連系されて いる場合に、系統電
力会社側の配電線と自家用発電機との間に設けられた分
岐線に直列に設けられた第１及び第２の電流検出器の接
続点と抵抗の検出用インピーダンス負荷との間に設けら
れたスイッチをオン、オフしたときに、単独運転判定部
がスイッチオフ時の第１又は第２の電流ピーク値検出器
が検出した電流のピーク値とスイッチオン時の第１の電
流ピーク値検出器が検出した電流のピーク値との差が所
定の値より大きいときは自家用発電設備が系統電力会社
側と連系されて健全な正常の場合と判定し、またスイッ
チオフ時の第１又は第２の電流ピーク値検出器が検出し
た電流のピーク値とスイッチオン時の第２の電流ピーク
値検出器が検出した電流のピーク値との差が所定の値よ
り大きいときは自家用発電設備が系統電力会社側と連系
中に不健全な状態で自家用発電設備が単独運転している
場合と判定することができるので、自家用発電設備が不
健全な単独運転していると判定した場合は直ちに自家用
発電設備を系統電力会社側から分離させ、自家用発電設
備側の機器類の損傷、或いは系統電力会社側の配電線の
保守点検時の事故等の各種の事故の発生を防止できると
いう効果を有する。 According to a fourth aspect of the present invention, a private use
If the power plant is powered side and interconnection, system electrodeposition
The part installed between the power company's distribution line and the private generator
The connection of the first and second current detectors provided in series with the branch line
Between the connection point and the impedance load for detecting the resistance.
When the switch is turned on or off, the islanding
First or second current peak value detector when switch off
The peak value of the detected current and the first
The difference from the peak value of the current detected by the
If the value is larger than the specified value, the private power generation equipment is
Is linked to the
The first or second current peak value detector at the time of
Current peak value and second current peak at switch-on
The difference between the peak value of the current detected by the value detector and the
Private power generation facilities are connected to the grid power company
The private power generation facility is operating alone in an unhealthy state
The power generation facilities for private use are not
Immediately for private use if it is determined that the vehicle is operating in a healthy state
Separate the power generation facilities from the grid power company side, and
Equipment on the equipment side, or the distribution line on the grid power company side
It is possible to prevent the occurrence of various accidents such as accidents during maintenance and inspection.
This has the effect.
【図１】本発明の実施の形態１の自家用発電設備の単独
運転検出装置の構成を示す単線結線図である。FIG. 1 is a single-line diagram showing a configuration of an isolated operation detection device for a private power generation facility according to Embodiment 1 of the present invention.
【図２】同単独運転検出装置の分岐線から検出用インピ
ーダンス負荷に流れる電流の模式化した波形図である。FIG. 2 is a schematic waveform diagram of a current flowing from a branch line of the isolated operation detection device to a detection impedance load.
【図３】同単独運転検出装置の分岐線から検出用インピ
ーダンス負荷に流れる電流の実際の波形図である。FIG. 3 is an actual waveform diagram of a current flowing from a branch line of the isolated operation detection device to a detection impedance load.
１ 系統電力会社 ２ 自家用発電設備 ３ 配電線 ６ 分岐線 ８ 自家用発電機 ９ 自家用負荷 １０ 第１電流検出器（ＣＴ１） １１ 第２電流検出器（ＣＴ２） １２ スイッチ １３ 検出用インピーダンス負荷 １４ 第１位相検出器 １５ 第２位相検出器 １６ 第１電流ピーク検出器 １７ 第２電流ピーク検出器 １８ 単独運転判定部 DESCRIPTION OF SYMBOLS 1 Grid power company 2 Private power generation equipment 3 Distribution line 6 Branch line 8 Private generator 9 Private load 10 First current detector (CT1) 11 Second current detector (CT2) 12 Switch 13 Impedance load for detection 14 First phase Detector 15 Second phase detector 16 First current peak detector 17 Second current peak detector 18 Islanding operation determination unit
Claims (4)
線を介して電力が供給され、かつ自家用発電機から主と
して電力を供給される自家用負荷を有する自家用発電設
備であって、 系統電力側の配電線と自家用発電機との間に設けられて
いる分岐線に設けられた電流検出器と、 分岐線における電流検出器より自家用発電機側にスイッ
チを介して接続された抵抗である検出用インピーダンス
負荷と、 電流検出器に流れる電流の位相を検出する位相検出器
と、 スイッチオフ時の位相検出器が検出した電流の位相とス
イッチオン時の位相検出器が検出した電流の位相との差
が所定の値より大きいときは自家用発電設備が系統電力
会社側と連系されて健全な正常な場合と判定する単独運
転判定部とからなることを特徴とする自家用発電設備の
単独運転検出装置。 1. Distribution from the grid power company that supplies power
Power is supplied through the power line, and the
Power generator with a private load that is supplied with power
Installed between the distribution line on the grid power side and the private generator.
The current detector provided in the branch line and the current detector in the branch line
Impedance, which is the resistance connected through the switch
Phase detector that detects the phase of the load and the current flowing through the current detector
And the phase and current of the current detected by the phase detector when the switch is off.
Difference from the phase of the current detected by the phase detector when the switch is on
Is larger than the specified value, the private power generation
Single operation that is linked to the company and determines that it is sound and normal
A self-power generation facility,
Islanding detection device.
線を介して電力が供給され、かつ自家用発電機から主と
して電力を供給される自家用負荷を有する自家用発電設
備であって、 系統電力側の配電線と自家用発電機との間に設けられて
いる分岐線に直列に設けられた第１及び第２の電流検出
器と、 分岐線における第１及び第２の電流検出器の接続点にス
イッチを介して接続された抵抗である検出用インピーダ
ンス負荷と、配電線側の第１の電流検出器に流れる電流の位相を検出
する第１の位相検出器と、 自家用発電機側の第２の電流検出器に流れる電流の位相
を検出する第２の位相検出器と、 スイッチオフ時の第１又は第２の位相検出器が検出した
電流の位相とスイッチオン時の第１の位相検出器が検出
した電流の位相との差 が所定の値より大きいときは自家
用発電設備が系統電力会社側と連系されて健全な正常な
場合と判定し、スイッチオフ時の第１又は第２の位相検
出器が検出した電流の位相とスイッチオン時の第２の位
相検出器が検出した電流の位相との差が所定の値より大
きいときは自家用発電設備が系統電力会社側と連系中に
不健全な状態で自家用発電設備が単独運転している場合
と判定する単独運転判定部とからなることを特徴とする
自家用発電設備の単独運転検出装置。2. A private power generation facility having a private load to which power is supplied from a grid power company that supplies power via a distribution line and that is mainly supplied with power from a private generator, It is provided between the distribution line and private power generator
First and second current detectors provided in series on a branch line, and a detection impedance load as a resistor connected via a switch to a connection point of the first and second current detectors on the branch line And the phase of the current flowing through the first current detector on the distribution line side
Phase of the first phase detector and the phase of the current flowing through the second current detector on the private generator side
And the first or second phase detector when the switch is turned off is detected.
Current phase and first phase detector at switch on detect
When the difference from the phase of the detected current is larger than a predetermined value, it is determined that the private power generation equipment is connected to the grid power company side and is in a healthy state, and the first or second phase detection at the time of switch-off is performed.
The phase of the current detected by the transmitter and the second position at switch-on
When the difference between the phase of the current detected by the phase detector and the current value is larger than a predetermined value, it is determined that the private power generation facility is operating in an unhealthy state while the private power generation facility is connected to the grid power company side in an unhealthy state. An isolated operation detection device for a private power generation facility, comprising:
線を介して電力が供給され、かつ自家用発電機から主と
して電力を供給される自家用負荷を有する自家用発電設
備であって、 系統電力側の配電線と自家用発電機との間に設けられて
いる分岐線に設けられた電流検出器と、 分岐線における電流検出器より自家用発電機側にスイッ
チを介して接続された抵抗である検出用インピーダンス
負荷と、 電流検出器に流れる電流のピーク値を検出する電流ピー
ク値検出器と、 スイッチオフ時の電流ピーク値検出器が検出した電流の
ピーク値とスイッチオン時の電流ピーク値検出器が検出
した電流のピーク値との差が所定の値より大きいときは
自家用発電設備が系統電力側と連系されて健全な正常な
場合と判定する単独運転判定部とからなることを特徴と
する自家用発電設備の単独運転検出装置。 3. Distribution from the grid power company that supplies power
Power is supplied through the power line, and the
Power generator with a private load that is supplied with power
Installed between the distribution line on the grid power side and the private generator.
The current detector provided in the branch line and the current detector in the branch line
Impedance, which is the resistance connected through the switch
The load and the current peak that detects the peak value of the current flowing through the current detector
Value detector and the current detected by the current peak value detector when the switch is off.
Peak value and current peak value detector at switch on detected
If the difference from the current peak value is larger than the specified value
Private power generation equipment is connected to the grid power side to
And an islanding operation judging unit for judging the case.
Operation detection device for private power generation equipment.
線を介して電力が供給され、かつ自家用発電機から主と
して電力を供給される自家用負荷を有する自家用発電設
備であって、 系統電力側の配電線と自家用発電機との間に設けられて
いる分岐線に直列に設けられた第１及び第２の電流検出
器と、 分岐線における第１及び第２の電流検出器の接続点にス
イッチを介して接続された抵抗である検出用インピーダ
ンス負荷と、 配電線側の第１の電流検出器に流れる電流のピーク値を
検出する第１の電流ピーク値検出器と、 自家用発電機側の第２の電流検出器に流れる電流のピー
ク値を検出する第２の電流ピーク値検出器と、 スイッチオフ時の第１又は第２の電流ピーク値検出器が
検出した電流のピーク値とスイッチオン時の第１の電流
ピーク値検出器が検出した電流のピーク値との差が所定
の値より大きいときは自家用発電設備が系統電力側と連
系されて健全な正常な場合と判定し、スイッチオフ時の
第１又は第２の電流ピーク値検出器が検出した電流のピ
ーク値とスイッチオン時の第２の電流ピーク値検出器が
検出した電流のピーク値との差が所定の値より大きいと
きは自家用発電設備が系統電力会社側と連系中に不健全
な状態で自家用発電設備が単独運転している場合と判定
する単独運転判定部とからなることを特徴とする自家用
発電設備の単独運転検出装置。 4. Distribution from the grid power company that supplies power
Power is supplied through the power line, and the
Power generator with a private load that is supplied with power
Installed between the distribution line on the grid power side and the private generator.
And second current detection provided in series with a branch line
At the junction between the detector and the first and second current detectors in the branch line.
Detector is a resistor connected through a switch
And the peak value of the current flowing through the first current detector on the distribution line side.
The peak of the current flowing through the first current peak value detector to be detected and the current flowing through the second current detector on the private generator side.
A second current peak value detector for detecting the peak value and a first or second current peak value detector when the switch is off.
Peak value of detected current and first current at switch-on
Predetermined difference from peak value of current detected by peak value detector
If the value is larger than the value of
System is judged to be healthy and normal, and
The peak of the current detected by the first or second current peak value detector.
The peak current and the second current peak value detector at switch-on
If the difference from the detected current peak value is larger than a predetermined value
Kiha's private power generation equipment is unhealthy during interconnection with the grid power company
Judgment that the private power generation equipment is operating alone
A private operation determination unit that performs
An isolated operation detection device for power generation equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10144938A JP3030813B2 (en) | 1998-05-27 | 1998-05-27 | Standalone operation detection device for private power generation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10144938A JP3030813B2 (en) | 1998-05-27 | 1998-05-27 | Standalone operation detection device for private power generation equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11341687A JPH11341687A (en) | 1999-12-10 |
| JP3030813B2 true JP3030813B2 (en) | 2000-04-10 |
Family
ID=15373690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10144938A Expired - Fee Related JP3030813B2 (en) | 1998-05-27 | 1998-05-27 | Standalone operation detection device for private power generation equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3030813B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5773191B2 (en) * | 2011-05-31 | 2015-09-02 | オムロン株式会社 | Detection apparatus and method, and program |
| JP5880915B2 (en) * | 2011-05-31 | 2016-03-09 | オムロン株式会社 | Detection apparatus and method, and program |
| JP6134558B2 (en) * | 2013-04-02 | 2017-05-24 | 株式会社ダイヘン | Isolated operation detection circuit, isolated operation detection method, and grid-connected inverter device provided with isolated operation detection circuit |
-
1998
- 1998-05-27 JP JP10144938A patent/JP3030813B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11341687A (en) | 1999-12-10 |
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