WO2024024214A1 - Distributed electric power source electric power distribution system and method for controlling distributed electric power source electric power distribution system - Google Patents

Distributed electric power source electric power distribution system and method for controlling distributed electric power source electric power distribution system Download PDF

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Publication number
WO2024024214A1
WO2024024214A1 PCT/JP2023/017998 JP2023017998W WO2024024214A1 WO 2024024214 A1 WO2024024214 A1 WO 2024024214A1 JP 2023017998 W JP2023017998 W JP 2023017998W WO 2024024214 A1 WO2024024214 A1 WO 2024024214A1
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electric power
power source
distribution system
distributed power
distributed
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PCT/JP2023/017998
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French (fr)
Japanese (ja)
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隆 佐藤
修 友部
将士 山本
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株式会社日立製作所
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Publication of WO2024024214A1 publication Critical patent/WO2024024214A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers

Definitions

  • the present invention relates to a distributed power distribution system and a method for controlling a distributed power distribution system for estimating a fault point when a power outage occurs in a power distribution system to which distributed power generation sites are connected.
  • a conventional method for detecting fault points in power distribution systems is timed transmission.
  • this system temporarily shuts off the distribution line by shutting off the sending circuit breaker at the distribution substation. Then, open all automatic switches on the distribution lines.
  • the sending circuit breakers at the distribution substations are turned on, and then the automatic switches that separate the distribution lines in order of distance from the distribution substations are turned on.
  • the distribution line breakers are turned on again, and then the automatic switches are turned on in order of distance from the distribution substation.
  • the automatic switch in front of the accident zone is locked open, so it will not close.
  • Patent Document 1 As a distributed power distribution system for improving this, there is one described in Patent Document 1, for example.
  • power is restored to the normal outage area by reverse power flowing from the power source at the distributed power generation site to the normal outage area.
  • the present invention provides a distributed power distribution system and a method for controlling the distributed power distribution system that cooperates with an islanding prevention device and can suppress overvoltage when a ground fault occurs multiple times during reverse power flow from a distributed power source.
  • the purpose is to
  • the present invention is configured as follows.
  • a distribution system that supplies power to a power demand unit via an automatic switch, a power supply, an islanding prevention device, and an output signal of the islanding prevention device connected to the high voltage distribution line.
  • a disconnection circuit breaker that opens and closes based on the voltage, a suppressing switch for the islanding prevention device, a second grounding instrument transformer, and a high-resistance grounding switch;
  • a distributed power source site that is connected via a distribution line and supplies power to loads, and in the event of a ground fault, when reverse power is caused to flow from the power source of the distributed power source site to the distribution system as a starting point, temporarily
  • the second grounded potential transformer is used to ground the neutral point of the distributed power site via the high resistance ground switch.
  • a distributed power supply system comprising a power distribution system that supplies power to the power demand section via an automatic switch, and a distributed power supply site that is connected to the power distribution system by a high-voltage distribution line and supplies power to the load.
  • a second ground voltage instrument transformer is temporarily used as a neutral point of the distributed power source site. is grounded via a high resistance grounding switch.
  • a distributed power distribution system and a method for controlling the distributed power distribution system that cooperates with an islanding prevention device and can suppress overvoltage when a ground fault occurs multiple times during reverse power flow from a distributed power source. can do.
  • FIG. 1 is a schematic configuration diagram of a distributed power distribution system according to a first embodiment
  • FIG. 1 is a high-voltage distribution line voltage waveform of Example 1. It is a high-voltage distribution line voltage waveform of an example different from the present invention.
  • FIG. 2 is a schematic configuration diagram of main parts of a distributed power distribution system according to a second embodiment.
  • FIG. 3 is a schematic configuration diagram of a distributed power distribution system according to a third embodiment.
  • FIG. 3 is a schematic configuration diagram of a distributed power distribution system according to a fourth embodiment.
  • Example 1 Example 1 will be described using FIGS. 1, 2A, and 2B.
  • FIG. 1 is a diagram showing a schematic configuration of a distributed power distribution system 100 according to the first embodiment.
  • a distributed power distribution system 100 includes a power distribution system 200, a distributed power source site 21, and a high voltage distribution line 5.
  • the power distribution system 200 includes a power distribution substation 1 and automatic switches 9a to 9h.
  • the high voltage distribution line 5 connects the distribution substation 1, the high voltage consumers 10a, 10b, and 10c, and the distributed power source site 21.
  • the high voltage consumer 10a is supplied with power via the automatic switches 9a to 9g, and the high voltage consumer 10b is supplied with power via the automatic switches 9a to 9e and 9h. Further, in normal times, the high voltage consumer 10c is supplied with electric power via the automatic switches 9a, 9b, and 9c.
  • the distribution substation 1 includes, as power sending equipment, a first grounded instrument transformer 3a, a sending circuit breaker 8a, a first zero-phase current transformer 4, and a power source 7a.
  • the power distribution system includes automatic switches 9a to 9h.
  • the distributed power source site 21 includes, as power receiving equipment, a second zero-phase current transformer 2a arranged on the high-voltage distribution line 5 within the distributed power source site 21, a capacitor type ground fault detection device 11, and a disconnecting circuit breaker 8b. Equipped with. Further, the distributed power source site 21 includes an islanding prevention device 18, a power source 7b, a switching protection device 14, a load 22, and a power reception control device 15, and supplies power to the load 22.
  • the islanding prevention device 18 detects a power outage on the power distribution system 200 side and shuts off the parallel disconnection circuit breaker 8b.
  • a third zero-phase current transformer 2b is provided on the connection conductor from the power source 7b to the premises busbar, and when a fault current flows due to a failure of the load 22, the third zero-phase current transformer 2b detects it. Then, according to the detection signal from the third zero-phase current transformer 2b, the switching protection device 14 interrupts the protective circuit breaker 8c to protect the power supply 7b.
  • the power reception control device 15 interrupts the disconnection circuit breaker 8b based on the output from a zero-sequence current sensor (not shown).
  • a suppressing switch 17a of the islanding prevention device 18 is provided on the control line connecting the islanding prevention device 18 and the parallel disconnection circuit breaker 8b.
  • a second grounding instrument transformer 3b and a high resistance grounding switch 17b are provided to ground the neutral point of the on-premise power distribution system with high resistance only when a reverse power flow starts from the distributed power source site 21.
  • the distribution substation 1 when the distribution substation 1, the high voltage consumers 10a, 10b, 10c, and the distributed power source site 21 are operating in parallel, if a single line ground fault 30a occurs, the distribution substation 1
  • the first zero-phase current transformer 4 detects the fault current and interrupts the sending circuit breaker 8a.
  • the automatic switches 9a to 9h open when detecting a power outage.
  • the islanding prevention device 18 of the distributed power supply site 21 detects islanding and shuts off the parallel disconnection circuit breaker 8b. Within the distributed power source site 21, autonomous operation continues.
  • the sending circuit breaker 8a in the distribution substation 1 is turned on, and the automatic switches 9a to 9h are turned on in the order of proximity to the distribution substation 1.
  • the sending circuit breaker 8a in the distribution substation 1 is turned on, and then the automatic switch 9a is turned on to complete power restoration. Since the automatic switch 9b is locked open, it is not turned on.
  • the output of the islanding prevention device 18 is suppressed by the suppression switch 17a in the distributed power supply site 21, which suppresses the islanding prevention device. Furthermore, by turning on the high resistance grounding switch 17b, the neutral point of the on-site power distribution system of the distributed power supply site 21 is grounded with high resistance by the second grounding instrument transformer 3b.
  • the automatic switch 9f is locked open.
  • the automatic switch 9d is also opened once.
  • the disconnection circuit breaker 8b of the distributed power source site 21 is turned on again, and the automatic switches 9d, 9e, and 9h are turned on in sequence, the high-voltage consumers 10c and 10b are restored by the reverse power flow from the distributed power source site 21. Powered up.
  • the presence or absence of an accident in a healthy power outage section is detected. If the power capacity of the distributed power source site 21 is insufficient, power restoration may be stopped and power restored only to a range commensurate with the power capacity of the distributed power source site 21.
  • FIGS. 2A and 2B show the system voltage when a single-line ground fault occurs during time-sequential transmission in the reverse direction starting from the distributed power source site 21 in FIG. 1.
  • FIG. 2A is an example according to the first embodiment of the present invention, and shows the system voltage when the neutral point of the on-site power distribution system is grounded with high resistance by the second ground voltage instrument transformer 3b in the distributed power supply site 21.
  • FIG. 2B is an example different from the present invention, and shows the system voltage in the case where the neutral point of the on-premise power distribution system is not grounded to high resistance by the second ground voltage instrument transformer 3b within the distributed power supply site 21.
  • the neutral point of the on-site power distribution system is connected to the second ground voltage instrument transformer 3b by the high resistance grounding switch 17b. By providing high resistance grounding, this overvoltage can be avoided.
  • the ground fault current detection sensitivity at the distribution substation 1 decreases, so the neutral point of the distribution system within the distributed power source site 21 is High resistance grounding using the second grounding instrument transformer 3b is not performed.
  • Embodiment 1 of the present invention when a ground fault occurs in the distributed power distribution system 100, power flows backward from the distributed power source site 21 to the normal power outage section, so that timed sequential transmission starting from the distributed power source site 21 is performed. (backward timed forwarding) detects the presence or absence of a fault section in a healthy power outage section, and the high resistance second grounded instrument transformer 3b placed at the neutral point detects the reverse timed forwarding process. This makes it possible to prevent overvoltage in the power distribution line when multiple ground faults occur, and it becomes possible to safely implement reverse timed transmission.
  • a distributed power distribution system 100 and a method for controlling the distributed power distribution system that can cooperate with the islanding prevention device 18 and suppress overvoltage when a ground fault occurs multiple times during reverse power flow from the distributed power source site 21. can do.
  • Example 2 Next, Example 2 of the present invention will be described.
  • FIG. 3 is a schematic configuration diagram of the distributed power source site 21 of the distributed power distribution system 100 according to the second embodiment.
  • the configuration of the distributed power distribution system 100 other than the distributed power source site 21 is the same as that of the first embodiment shown in FIG. 1, so illustration and detailed description will be omitted.
  • a protection transformer 23 is provided within the distributed power source site 21.
  • One end of the protection transformer 23 is connected to the load 22 and the high resistance grounding switch 17b, and the other end of the protection transformer 23 is connected to the power supply 7b via the protection circuit breaker 8c.
  • a third ground voltage instrument transformer 3c is connected to the connection point (neutral point) between the other end of the protection transformer 23 and the protection circuit breaker 8c.
  • the neutral point of the connection line from the protection transformer 23 to the power supply 7b is always configured to be grounded with high resistance by the third grounding instrument transformer 3c, and earth fault protection is possible. be. Further, reverse time-sequential transmission starting from the distributed power source site 21 is possible, and in that case, the same effect as in the first embodiment can be obtained by turning on the high resistance grounding switch 17b.
  • the second embodiment in addition to being able to obtain the same effects as the first embodiment, it is also possible to improve the ground fault protection performance of the distributed power source site 21.
  • Example 3 of the present invention will be described.
  • FIG. 4 is a schematic configuration diagram of a distributed power distribution system 100 according to the third embodiment.
  • the suppression switch 17a as the islanding prevention device suppression switch in the distributed power source site 21, the high resistance grounding switch 17b, and the disconnection circuit breaker 8b are installed in the power distribution automation system of the central power dispatch center. It is operated by commands from the system (power distribution automation section) 24.
  • the power distribution automation system 24 of the central power dispatch center controls the opening/closing operations of the suppression switch 17a, the high resistance grounding switch 17b, and the disconnection circuit breaker 8b based on the output signal from the islanding prevention device 18.
  • the power distribution automation system 24 controls the opening and closing operations of the sending circuit breaker 8a and automatic switches 9a and 9b.
  • the third embodiment in addition to being able to obtain the same effects as in the first embodiment, it is also possible to perform cooperative control with the power distribution automation system 24 of the central power dispatch center, thereby further improving reliability and safety. Can be done.
  • Example 4 of the present invention will be described.
  • FIG. 5 is a schematic configuration diagram of a distributed power distribution system 100 according to the fourth embodiment.
  • the power reception control device 15 was configured to shut off the protective circuit breaker 8c based on the output from the zero-phase current sensor (not shown), but in the fourth embodiment
  • the second zero-phase current transformer 2a and the capacitor type ground fault detection device 11 are shared by the power reception control device 15 and the islanding prevention device 18 in the power receiving control device.
  • the islanding prevention device 18 and the power receiving control device 15 are supplied with the output signal of the second zero-phase current transformer 2a and the output signal of the capacitor type ground fault detector 11, and the output signal of the second zero-phase current transformer 2a is supplied.
  • the parallel disconnecting circuit breaker 8b is opened and closed according to the output signal or the output signal of the capacitor type ground fault detector 11.
  • the above-mentioned zero-phase current sensor can be omitted.
  • the zero-phase current sensor in addition to obtaining the same effects as the first embodiment, can be omitted, and the number of parts can be reduced.
  • Embodiment 4 can also be applied to Embodiment 2 and Embodiment 3 described above.
  • SYMBOLS 1 Distribution substation, 2a... 2nd zero-phase current transformer, 2b... 3rd zero-phase current transformer, 4... 1st zero-phase current transformer, 3a... th 1 Grounding plane instrument transformer, 3b... Second grounding plane instrument transformer, 3c... Third grounding plane instrument transformer, 5... High voltage distribution line, 7a, 7b... Power supply, 8a... Sending circuit breaker, 8b... Line breaking circuit breaker, 8c... Protective circuit breaker, 9a to 9h... Automatic switch, 10a, 10b, 10c... High voltage consumer (electric power demand section), 11... Capacitor type ground fault detection device, 14... Switching protection device, 15... Power receiving control device, 17a... Suppression switch, 17b...
  • High resistance grounding switch 18... ... Islanding prevention device, 21 ... Distributed power supply site, 22 ... Load, 23 ... Protective transformer, 24 ... Power distribution automation system (power distribution automation department), 30a, 30b ... Line Ground fault accident, 100... Distributed power distribution system, 200... Power distribution system

Abstract

Provided is a distributed electric power source electric power distribution system that cooperates with an anti-islanding device and is able to suppress over-voltages that occur when a ground fault has occurred multiple times during a reverse electric power flow from a distributed electric power source. In the present invention, a distributed electric power source electric power distribution system 100 comprises: an electric power distribution grid 200 that supplies electric power to electric power-demanding units 10a–10c via automatic switches 9a–9h; and a distributed electric power source site 21 that has an electric power source 7b, an anti-islanding device 18, a parallel-off breaker 8b that is connected to a high-voltage electric power distribution line 5 and is opened and closed on the basis of an output signal from the anti-islanding device 18, a switch 17a for controlling the anti-islanding device 18, a second transformer 3b for a grounded measuring instrument, and a high-resistance grounding switch 17b, the distributed electric power source site 21 being connected to the electric power distribution grid 200 via the high-voltage electric power distribution line 5 and supplying electric power to a load 22. When, at the time of a ground fault accident, a reverse electric power flow to the electric power distribution grid 200 that originates from the electric power source 7b of the distributed electric power source site 21 is caused, a neutral point of the distributed electric power source site 21 is grounded via the high-resistance grounding switch 17b, using the second transformer 3b for a grounded measuring instrument temporarily.

Description

分散電源配電システムおよび分散電源配電システムの制御方法Distributed power distribution system and control method for distributed power distribution system
　本発明は、分散電源サイトが接続されている配電系統で、停電時が発生したときに、事故点を推定するための分散電源配電システムおよび分散電源配電システムの制御方法に関する。 The present invention relates to a distributed power distribution system and a method for controlling a distributed power distribution system for estimating a fault point when a power outage occurs in a power distribution system to which distributed power generation sites are connected.
　従来の配電系統の事故点を検出する方法としては、時限順送がある。これは、配電線で事故が発生した時に、配電用変電所の送り出し用遮断器を遮断することで、一旦、配電線を停電させる。その後、配電線の自動開閉器をすべて開放する。次に、配電用変電所の送り出し用遮断器を投入し、その後、配電用変電所から近い順に、配電線を区分する自動開閉器を投入して行く。 A conventional method for detecting fault points in power distribution systems is timed transmission. When an accident occurs on a distribution line, this system temporarily shuts off the distribution line by shutting off the sending circuit breaker at the distribution substation. Then, open all automatic switches on the distribution lines. Next, the sending circuit breakers at the distribution substations are turned on, and then the automatic switches that separate the distribution lines in order of distance from the distribution substations are turned on.
　自動開閉器を投入する結果、事故区間に通電されると、配電線には事故電流が流れる。この事故電流を配電用変電所で検出し、送り出し遮断器を遮断する。その後、配電線の自動開閉器を開放する。この時、事故区間の直前の自動開閉器は再投入されないように開放ロックされる。 As a result of turning on the automatic switch, when the fault section is energized, fault current flows through the distribution line. This fault current is detected at the distribution substation and the sending circuit breaker is shut off. Then, open the automatic switch on the distribution line. At this time, the automatic switch just before the accident section is locked open to prevent it from being turned on again.
　続いて、再び、配電線の送り出し遮断器を投入し、その後、配電用変電所から近い順に、自動開閉器を投入して行く。事故区間の手前の自動開閉器は開放ロックされているため、投入されない。以上の手続きにより、事故区間を検出し、且つ、配電用変電所から事故区間の手前の区間までの復電が完了する。 Next, the distribution line breakers are turned on again, and then the automatic switches are turned on in order of distance from the distribution substation. The automatic switch in front of the accident zone is locked open, so it will not close. Through the above procedure, the accident section is detected and power restoration from the distribution substation to the section before the accident section is completed.
　上記、時限順送では、配電用変電所から直近の事故区間の間に事故点が無いことを検出できるが、事故区間の先の区間（健全停電区間）内の事故点は検出できず、また、事故区間で遮られてしまうため、健全停電区間を復電させることができなかった。 In the timed sequential transmission described above, it is possible to detect that there is no fault point between the distribution substation and the most recent fault section, but it is not possible to detect a fault point in the section beyond the fault section (healthy power outage section). , it was not possible to restore power to the normal outage section because it was blocked by the accident section.
　これを改善するための分散電源配電システムとして、例えば特許文献１に記載のものがある。そのシステムでは、分散電源サイトの電源より、健全停電区間に逆潮流させることで、健全停電区間を復電している。 As a distributed power distribution system for improving this, there is one described in Patent Document 1, for example. In this system, power is restored to the normal outage area by reverse power flowing from the power source at the distributed power generation site to the normal outage area.
特開２００９－１４８０９８号公報Japanese Patent Application Publication No. 2009-148098
　特許文献１に記載の分散電源配電システムでは、配電系統事故を検出して、分散電源の予備力を考慮した事故復旧を行うことが示されているが、分散電源からの逆潮流をふせぐための単独運転防止装置との協調動作については、考慮されていない。 In the distributed power distribution system described in Patent Document 1, it is shown that a distribution system fault is detected and accident recovery is performed taking into account the reserve power of the distributed power sources. Cooperative operation with the islanding prevention device is not considered.
　また、分散電源からの逆潮流時に地絡が複数回発生した時の配電線中性点の電位変化と過電圧発生を抑制することについても考慮されていない。 Additionally, no consideration is given to suppressing potential changes and overvoltage generation at the distribution line neutral point when ground faults occur multiple times during reverse power flow from distributed power sources.
　そこで、本発明は、単独運転防止装置と協調し、また、分散電源からの逆潮流時に地絡が複数回発生した時の過電圧を抑制できる分散電源配電システムおよび分散電源配電システムの制御方法を提供することを目的とする。 Therefore, the present invention provides a distributed power distribution system and a method for controlling the distributed power distribution system that cooperates with an islanding prevention device and can suppress overvoltage when a ground fault occurs multiple times during reverse power flow from a distributed power source. The purpose is to
　上記の目的を達成するため、本発明は次の様に構成される。 In order to achieve the above object, the present invention is configured as follows.
　分散電源配電システムにおいて、電力需要部に、自動開閉器を介して電力を供給する配電系統と、電源と、単独運転防止装置と、前記高圧配電線に接続され、前記単独運転防止装置の出力信号に基づいて開閉される解列用遮断器と、前記単独運転防止装置の抑制用スイッチと、第２接地形計器用変圧器と、高抵抗接地スイッチと、を有し、前記配電系統に前記高圧配電線を介して接続され、負荷に電力を供給する分散電源サイトと、を備え、地絡事故時に、前記分散電源サイトの前記電源を起点として、前記配電系統に逆潮流させる時に、一時的に前記第２接地形計器用変圧器を用いて前記分散電源サイトの中性点を、前記高抵抗接地スイッチを介して接地させる。 In a distributed power distribution system, a distribution system that supplies power to a power demand unit via an automatic switch, a power supply, an islanding prevention device, and an output signal of the islanding prevention device connected to the high voltage distribution line. a disconnection circuit breaker that opens and closes based on the voltage, a suppressing switch for the islanding prevention device, a second grounding instrument transformer, and a high-resistance grounding switch; a distributed power source site that is connected via a distribution line and supplies power to loads, and in the event of a ground fault, when reverse power is caused to flow from the power source of the distributed power source site to the distribution system as a starting point, temporarily The second grounded potential transformer is used to ground the neutral point of the distributed power site via the high resistance ground switch.
　また、電力需要部に、自動開閉器を介して電力を供給する配電系統と、高圧配電線により、前記配電系統とに接続され、負荷に電力を供給する分散電源サイトとを備える分散電源システムの制御方法において、地絡事故時に、前記分散電源サイトの電源を起点として、前記配電系統に逆潮流させる時に、一時的に第２接地形計器用変圧器を用いて前記分散電源サイトの中性点を、高抵抗接地スイッチを介して接地する。 Further, a distributed power supply system comprising a power distribution system that supplies power to the power demand section via an automatic switch, and a distributed power supply site that is connected to the power distribution system by a high-voltage distribution line and supplies power to the load. In the control method, in the event of a ground fault, when reverse power flow is caused from the power source at the distributed power source site to the distribution system, a second ground voltage instrument transformer is temporarily used as a neutral point of the distributed power source site. is grounded via a high resistance grounding switch.
　本発明によれば、単独運転防止装置と協調し、また、分散電源からの逆潮流時に地絡が複数回発生した時の過電圧を抑制できる分散電源配電システムおよび分散電源配電システムの制御方法を提供することができる。 According to the present invention, there is provided a distributed power distribution system and a method for controlling the distributed power distribution system that cooperates with an islanding prevention device and can suppress overvoltage when a ground fault occurs multiple times during reverse power flow from a distributed power source. can do.
実施例１の分散電源配電システムの概略構成図である。1 is a schematic configuration diagram of a distributed power distribution system according to a first embodiment; FIG. 実施例１の高圧配電線電圧波形である。1 is a high-voltage distribution line voltage waveform of Example 1. 本発明とは異なる例の高圧配電線電圧波形である。It is a high-voltage distribution line voltage waveform of an example different from the present invention. 実施例２の分散電源配電システムの要部概略構成図である。FIG. 2 is a schematic configuration diagram of main parts of a distributed power distribution system according to a second embodiment. 実施例３の分散電源配電システムの概略構成図である。FIG. 3 is a schematic configuration diagram of a distributed power distribution system according to a third embodiment. 実施例４の分散電源配電システムの概略構成図である。FIG. 3 is a schematic configuration diagram of a distributed power distribution system according to a fourth embodiment.
　以下、本発明を実施する上で好適となる実施例について図面を用いて説明する。なお、以下の説明は、あくまでも実施例に過ぎず、発明の内容が下記具体的態様に限定されるものではない。本発明は、下記態様を含めて種々の態様に変形することが無論可能である。 Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following description is merely an example, and the content of the invention is not limited to the specific embodiments below. It goes without saying that the present invention can be modified into various embodiments including the following embodiments.
　（実施例１）
　実施例１について図１、図２Ａ及び図２Ｂを用いて説明する。 (Example 1)
Example 1 will be described using FIGS. 1, 2A, and 2B.
　図１は実施例１の分散電源配電システム１００の概略構成を示す図である。 FIG. 1 is a diagram showing a schematic configuration of a distributed power distribution system 100 according to the first embodiment.
　図１において、分散電源配電システム１００は、配電系統２００と、分散電源サイト２１と、高圧配電線５とを備える。配電系統２００は、配電用変電所１、自動開閉器９ａ～９ｈを備える。 In FIG. 1, a distributed power distribution system 100 includes a power distribution system 200, a distributed power source site 21, and a high voltage distribution line 5. The power distribution system 200 includes a power distribution substation 1 and automatic switches 9a to 9h.
　高圧配電線５は、配電用変電所１、高圧需要家１０ａ、１０ｂ及び１０ｃと分散電源サイト２１とを接続する。 The high voltage distribution line 5 connects the distribution substation 1, the high voltage consumers 10a, 10b, and 10c, and the distributed power source site 21.
　通常時には、高圧需要家１０ａは、自動開閉器９ａ～９ｇを介して電力が供給され、高圧需要家１０ｂは、自動開閉器９ａ～９ｅ、及び９ｈを介して電力が供給される。また、通常時には、高圧需要家１０ｃは、自動開閉器９ａ、９ｂ及び９ｃを介して電力が供給される。 In normal times, the high voltage consumer 10a is supplied with power via the automatic switches 9a to 9g, and the high voltage consumer 10b is supplied with power via the automatic switches 9a to 9e and 9h. Further, in normal times, the high voltage consumer 10c is supplied with electric power via the automatic switches 9a, 9b, and 9c.
　配電用変電所１は、電力送り出し設備として、第1接地形計器用変圧器３ａと、送り出し遮断器８aと、第1零相変流器４と、電源７ａとを備える。 The distribution substation 1 includes, as power sending equipment, a first grounded instrument transformer 3a, a sending circuit breaker 8a, a first zero-phase current transformer 4, and a power source 7a.
　また、配電系統は、自動開閉器９ａ～９ｈを備える。 Additionally, the power distribution system includes automatic switches 9a to 9h.
　分散電源サイト２１は、受電設備として、分散電源サイト２１内の高圧配電線５に配置される第２零相変流器２ａと、コンデンサ形地絡検出装置１１と、解列用遮断器８ｂとを備える。また、分散電源サイト２１は、単独運転防止装置１８と、電源７ｂと、開閉保護装置１４と、負荷２２と、受電制御装置１５を備え、負荷２２に電力を供給する。 The distributed power source site 21 includes, as power receiving equipment, a second zero-phase current transformer 2a arranged on the high-voltage distribution line 5 within the distributed power source site 21, a capacitor type ground fault detection device 11, and a disconnecting circuit breaker 8b. Equipped with. Further, the distributed power source site 21 includes an islanding prevention device 18, a power source 7b, a switching protection device 14, a load 22, and a power reception control device 15, and supplies power to the load 22.
　単独運転防止装置１８は、電源７ｂと配電系統２００が並列運転している場合に、配電系統２００側の停電を検出して、解列用遮断器８ｂを遮断する。電源７ｂから構内母線への接続導体には第３零相変流器２ｂが設けられ、負荷２２が故障するなどで事故電流が流れると第３零相変流器２ｂがそれを検出する。そして、第３零相変流器２ｂからの検出信号に従って、開閉保護装置１４が保護用遮断器８ｃを遮断して電源７ｂを保護する。 When the power supply 7b and the power distribution system 200 are operating in parallel, the islanding prevention device 18 detects a power outage on the power distribution system 200 side and shuts off the parallel disconnection circuit breaker 8b. A third zero-phase current transformer 2b is provided on the connection conductor from the power source 7b to the premises busbar, and when a fault current flows due to a failure of the load 22, the third zero-phase current transformer 2b detects it. Then, according to the detection signal from the third zero-phase current transformer 2b, the switching protection device 14 interrupts the protective circuit breaker 8c to protect the power supply 7b.
　受電制御装置１５は、図示しない零相電流センサからの出力に基づいて、解列用遮断器８ｂを遮断する。 The power reception control device 15 interrupts the disconnection circuit breaker 8b based on the output from a zero-sequence current sensor (not shown).
　実施例１では、単独運転防止装置１８と解列用遮断器８ｂとを接続する制御線に単独運転防止装置１８の抑制用スイッチ１７ａを設ける。また、分散電源サイト２１を起点とする逆潮流時のみに、構内配電系の中性点を高抵抗接地する第２接地形計器用変圧器３ｂと高抵抗接地スイッチ１７ｂを設ける。 In the first embodiment, a suppressing switch 17a of the islanding prevention device 18 is provided on the control line connecting the islanding prevention device 18 and the parallel disconnection circuit breaker 8b. In addition, a second grounding instrument transformer 3b and a high resistance grounding switch 17b are provided to ground the neutral point of the on-premise power distribution system with high resistance only when a reverse power flow starts from the distributed power source site 21.
　この分散電源配電システム１００で、配電用変電所１、高圧需要家１０ａ、１０ｂ、１０ｃおよび分散電源サイト２１が並列運転している時に、一線地絡事故３０ａが発生すると、配電用変電所１の第１零相変流器４が、事故電流を検出し、送り出し遮断器８ａを遮断する。自動開閉器９ａ～９ｈは、停電を検出して開放する。 In this distributed power distribution system 100, when the distribution substation 1, the high voltage consumers 10a, 10b, 10c, and the distributed power source site 21 are operating in parallel, if a single line ground fault 30a occurs, the distribution substation 1 The first zero-phase current transformer 4 detects the fault current and interrupts the sending circuit breaker 8a. The automatic switches 9a to 9h open when detecting a power outage.
　また、分散電源サイト２１の単独運転防止装置１８は、単独運転を検出して、解列用遮断器８ｂを遮断する。分散電源サイト２１内では、自立運転が継続される。 Furthermore, the islanding prevention device 18 of the distributed power supply site 21 detects islanding and shuts off the parallel disconnection circuit breaker 8b. Within the distributed power source site 21, autonomous operation continues.
　復電時には、配電用変電所１内の送り出し遮断器８ａを投入し、配電用変電所１に近い順に自動開閉器９ａ～９ｈを投入して行く。 When power is restored, the sending circuit breaker 8a in the distribution substation 1 is turned on, and the automatic switches 9a to 9h are turned on in the order of proximity to the distribution substation 1.
　自動開閉器９ａを投入してから一定時間後に、自動開閉器９ｂを投入すると、一線地絡事故３０ａに対して事故電流が流れる。その事故電流を配電用変電所１で検出し、送り出し遮断器８ａを遮断する。自動開閉器９ａ、９ｂは開放されるが、自動開閉器９ｂは投入後に無電圧になる時間が短いため、開放ロックされる。 When the automatic switch 9b is turned on after a certain period of time after the automatic switch 9a is turned on, a fault current flows to the single line ground fault fault 30a. The fault current is detected at the distribution substation 1, and the sending circuit breaker 8a is shut off. The automatic switches 9a and 9b are opened, but the automatic switch 9b is locked open because the time when there is no voltage after turning on is short.
　一定時間後に、配電用変電所1内の送り出し遮断器８ａを投入し、次に自動開閉器９ａを投入して復電が完了する。自動開閉器９ｂは開放ロックされているため、投入されない。 After a certain period of time, the sending circuit breaker 8a in the distribution substation 1 is turned on, and then the automatic switch 9a is turned on to complete power restoration. Since the automatic switch 9b is locked open, it is not turned on.
　自動開閉器９ｂと９ｃとの間には一線地絡事故３０ａが存在するが、自動開閉器９ｃ以遠（９ｃ～９ｈ）に事故が存在するか否かは、配電用変電所１を起点とする時限順送では検出できない。 Although there is a single-line ground fault 30a between automatic switches 9b and 9c, whether there is an accident beyond automatic switch 9c (9c to 9h) is determined from the distribution substation 1. It cannot be detected by timed sequential transmission.
　本発明の実施例１では、逆潮流を発生する場合には、分散電源サイト２１内の単独運転防止装置抑制としての抑制用スイッチ１７ａで単独運転防止装置１８の出力を抑制する。また、高抵抗接地スイッチ１７ｂを投入することで、分散電源サイト２１の構内配電系の中性点を第２接地形計器用変圧器３ｂで高抵抗接地する。 In the first embodiment of the present invention, when a reverse power flow is generated, the output of the islanding prevention device 18 is suppressed by the suppression switch 17a in the distributed power supply site 21, which suppresses the islanding prevention device. Furthermore, by turning on the high resistance grounding switch 17b, the neutral point of the on-site power distribution system of the distributed power supply site 21 is grounded with high resistance by the second grounding instrument transformer 3b.
　この状態で、解列用遮断器８ｂを投入すると逆潮流が発生し、分散電源サイト２１を起点とする逆方向の時限順送が可能になる。 In this state, when the parallel disconnection circuit breaker 8b is turned on, a reverse power flow occurs, and time-limited sequential transmission in the reverse direction starting from the distributed power source site 21 becomes possible.
　具体的には、自動開閉器９ｄ、９ｃを順次投入すると事故電流が流れるため、解列用遮断器８ｂを遮断する。自動開閉器９ｃは開放ロックされ、次の復電時には投入されず、自動開閉器９ｃの手前まで復電される。次に、自動開閉器９ｅ、９ｆを投入すると事故電流が流れるため、分散電源サイト２１の解列用遮断器８ｂを遮断する。 Specifically, when the automatic switches 9d and 9c are sequentially turned on, a fault current flows, so the disconnection circuit breaker 8b is cut off. The automatic switch 9c is locked open, and the power is not turned on at the next power restoration, but the power is restored to just before the automatic switch 9c. Next, when the automatic switches 9e and 9f are turned on, a fault current flows, so the disconnection circuit breaker 8b of the distributed power supply site 21 is shut off.
　同様に、自動開閉器９ｆは開放ロックされる。自動開閉器９ｄも一旦開放される。次に、再度、分散電源サイト２１の解列用遮断器８ｂを投入し、自動開閉器９ｄ、９ｅ、９ｈを順次投入すると、高圧需要家１０ｃ、１０ｂは分散電源サイト２１からの逆潮流で復電される。 Similarly, the automatic switch 9f is locked open. The automatic switch 9d is also opened once. Next, when the disconnection circuit breaker 8b of the distributed power source site 21 is turned on again, and the automatic switches 9d, 9e, and 9h are turned on in sequence, the high-voltage consumers 10c and 10b are restored by the reverse power flow from the distributed power source site 21. Powered up.
　以上の手続きにより、健全停電区間の事故の有無が検出される。分散電源サイト２１の電源容量が不足する場合には、復電を中止し、分散電源サイト２１の電源容量に見合った範囲のみを再度復電してもよい。 Through the above procedure, the presence or absence of an accident in a healthy power outage section is detected. If the power capacity of the distributed power source site 21 is insufficient, power restoration may be stopped and power restored only to a range commensurate with the power capacity of the distributed power source site 21.
　図２Ａ及び図２Ｂは、図１の分散電源サイト２１を起点とする逆方向の時限順送時に、一線地絡が発生した場合の系統電圧を示す。 FIGS. 2A and 2B show the system voltage when a single-line ground fault occurs during time-sequential transmission in the reverse direction starting from the distributed power source site 21 in FIG. 1.
　図２Ａは、本発明の実施例１による例であり、分散電源サイト２１内で、構内配電系の中性点を第２接地形計器用変圧器３ｂで高抵抗接地する場合の系統電圧を示し、図２Ｂは、本発明とは異なる例であり、分散電源サイト２１内で、構内配電系の中性点を第２接地形計器用変圧器３ｂで高抵抗接地しない場合の系統電圧を示す。 FIG. 2A is an example according to the first embodiment of the present invention, and shows the system voltage when the neutral point of the on-site power distribution system is grounded with high resistance by the second ground voltage instrument transformer 3b in the distributed power supply site 21. , FIG. 2B is an example different from the present invention, and shows the system voltage in the case where the neutral point of the on-premise power distribution system is not grounded to high resistance by the second ground voltage instrument transformer 3b within the distributed power supply site 21.
　図２Ａでは一線地絡が収束すると、系統の中性点電位が減衰し、ゼロに漸近する。その後、０．５５秒近辺で一線地絡が発生しても、過電圧は発生しない。 In FIG. 2A, when the single-line ground fault converges, the neutral point potential of the system attenuates and approaches zero. After that, even if a single line ground fault occurs around 0.55 seconds, no overvoltage occurs.
　他方、図２Ｂでは一線地絡が収束後、系統の中性点電位が減衰せずに直流分が残留する。その状態で、０．５５秒近辺で一線地絡が発生すると、シフトした中性点電圧の分だけ過渡的な電位振動の振幅が大きくなるため、大きな過電圧が発生する。 On the other hand, in FIG. 2B, after the one-line ground fault is resolved, the neutral point potential of the system is not attenuated and a DC component remains. In this state, if a single line ground fault occurs in the vicinity of 0.55 seconds, the amplitude of the transient potential oscillation increases by the shifted neutral point voltage, resulting in a large overvoltage.
　分散電源サイト２１を起点とする逆方向の時限順送時のみに、分散電源サイト２１内で、構内配電系の中性点を、高抵抗接地スイッチ１７ｂにより第２接地形計器用変圧器３ｂで高抵抗接地することで、その過電圧発生を回避できる。 Only during timed forwarding in the reverse direction starting from the distributed power source site 21, within the distributed power source site 21, the neutral point of the on-site power distribution system is connected to the second ground voltage instrument transformer 3b by the high resistance grounding switch 17b. By providing high resistance grounding, this overvoltage can be avoided.
　分散電源サイト２１を起点とする逆方向の時限順送以外の状態では、配電用変電所１での地絡電流検出感度が低下するため、分散電源サイト２１内での配電系の中性点の第２接地形計器用変圧器３ｂを用いた高抵抗接地は行わない。 In conditions other than time-sequential transmission in the reverse direction starting from the distributed power source site 21, the ground fault current detection sensitivity at the distribution substation 1 decreases, so the neutral point of the distribution system within the distributed power source site 21 is High resistance grounding using the second grounding instrument transformer 3b is not performed.
　本発明の実施例1によれば、分散電源配電システム１００に地絡事故が発生した場合、分散電源サイト２１から健全停電区間に逆潮流することで、分散電源サイト２１を起点とする時限順送（逆方向時限順送）によって、健全停電区間の事故区間の有無を検出するとともに、中性点に配置された高抵抗の第２接地形計器用変圧器３ｂにより、逆方向時限順送の過程で、複数回の地絡が発生した時の配電線の過電圧を防止することができ、安全に逆時限順送を実施することが可能になる。 According to Embodiment 1 of the present invention, when a ground fault occurs in the distributed power distribution system 100, power flows backward from the distributed power source site 21 to the normal power outage section, so that timed sequential transmission starting from the distributed power source site 21 is performed. (backward timed forwarding) detects the presence or absence of a fault section in a healthy power outage section, and the high resistance second grounded instrument transformer 3b placed at the neutral point detects the reverse timed forwarding process. This makes it possible to prevent overvoltage in the power distribution line when multiple ground faults occur, and it becomes possible to safely implement reverse timed transmission.
　よって、単独運転防止装置１８と協調し、また、分散電源サイト２１からの逆潮流時に地絡が複数回発生した時の過電圧を抑制できる分散電源配電システム１００および分散電源配電システムの制御方法を提供することができる。 Therefore, we provide a distributed power distribution system 100 and a method for controlling the distributed power distribution system that can cooperate with the islanding prevention device 18 and suppress overvoltage when a ground fault occurs multiple times during reverse power flow from the distributed power source site 21. can do.
　（実施例２）
　次に、本発明の実施例２について説明する。 (Example 2)
Next, Example 2 of the present invention will be described.
　図３は、実施例２による分散電源配電システム１００の分散電源サイト２１の概略構成図である。 FIG. 3 is a schematic configuration diagram of the distributed power source site 21 of the distributed power distribution system 100 according to the second embodiment.
　分散電源サイト２１以外の分散電源配電システム１００の構成は図１に示した実施例１と同様であるので、図示及び詳細な説明は省略する。 The configuration of the distributed power distribution system 100 other than the distributed power source site 21 is the same as that of the first embodiment shown in FIG. 1, so illustration and detailed description will be omitted.
　本実施例２では、分散電源サイト２１内に保護用変圧器２３が設けられている。保護用変圧器２３の一方端が、負荷２２と高抵抗接地スイッチ１７ｂとに接続され、保護用変圧器２３の他方端は、保護用遮断器８ｃを介して電源７ｂに接続されている。 In the second embodiment, a protection transformer 23 is provided within the distributed power source site 21. One end of the protection transformer 23 is connected to the load 22 and the high resistance grounding switch 17b, and the other end of the protection transformer 23 is connected to the power supply 7b via the protection circuit breaker 8c.
　また、保護用変圧器２３の他方端と保護用遮断器８ｃとの接続点（中性点）には、第３接地形計器用変圧器３ｃが接続されている。 Further, a third ground voltage instrument transformer 3c is connected to the connection point (neutral point) between the other end of the protection transformer 23 and the protection circuit breaker 8c.
　実施例２においては、保護用変圧器２３から電源７ｂに到る接続線の中性点は常時、第３接地形計器用変圧器３ｃによって高抵抗接地可能に構成され、地絡保護が可能である。また、分散電源サイト２１起点の逆時限順送は可能であり、その際は、高抵抗接地スイッチ１７ｂを投入することで、実施例１と同様の効果を得ることができる。 In the second embodiment, the neutral point of the connection line from the protection transformer 23 to the power supply 7b is always configured to be grounded with high resistance by the third grounding instrument transformer 3c, and earth fault protection is possible. be. Further, reverse time-sequential transmission starting from the distributed power source site 21 is possible, and in that case, the same effect as in the first embodiment can be obtained by turning on the high resistance grounding switch 17b.
　実施例２によれば、実施例１と同様な効果を得ることができる他、分散電源サイト２１の地絡保護性能を向上することができる。 According to the second embodiment, in addition to being able to obtain the same effects as the first embodiment, it is also possible to improve the ground fault protection performance of the distributed power source site 21.
　（実施例３）
　次に、本発明の実施例３について説明する。 (Example 3)
Next, Example 3 of the present invention will be described.
　図４は、実施例３による分散電源配電システム１００の概略構成図である。 FIG. 4 is a schematic configuration diagram of a distributed power distribution system 100 according to the third embodiment.
　図４において、本実施例３では、分散電源サイト２１内の単独運転防止装置抑制スイッチとしての抑制用スイッチ１７ａ、高抵抗接地スイッチ１７ｂ、解列用遮断器８ｂを、中央給電指令所の配電自動化システム（配電自動化部）２４からの指令で操作する。中央給電指令所の配電自動化システム２４は、単独運転防止装置１８からの出力信号に基づいて、抑制用スイッチ１７ａ、高抵抗接地スイッチ１７ｂおよび解列用遮断器８ｂの開閉動作を制御する。 In FIG. 4, in the third embodiment, the suppression switch 17a as the islanding prevention device suppression switch in the distributed power source site 21, the high resistance grounding switch 17b, and the disconnection circuit breaker 8b are installed in the power distribution automation system of the central power dispatch center. It is operated by commands from the system (power distribution automation section) 24. The power distribution automation system 24 of the central power dispatch center controls the opening/closing operations of the suppression switch 17a, the high resistance grounding switch 17b, and the disconnection circuit breaker 8b based on the output signal from the islanding prevention device 18.
　また、配電自動化システム２４は、送り出し遮断器８ａ、自動開閉器９ａ、９ｂの開閉動作を制御する。 Additionally, the power distribution automation system 24 controls the opening and closing operations of the sending circuit breaker 8a and automatic switches 9a and 9b.
　本実施例３によれば、実施例１と同様な効果を得ることができる他、中央給電指令所の配電自動化システム２４との協調制御が可能となり、信頼性及び安全性を、より向上することができる。 According to the third embodiment, in addition to being able to obtain the same effects as in the first embodiment, it is also possible to perform cooperative control with the power distribution automation system 24 of the central power dispatch center, thereby further improving reliability and safety. Can be done.
　（実施例４）
　次に、本発明の実施例４について説明する。 (Example 4)
Next, Example 4 of the present invention will be described.
　図５は、実施例４による分散電源配電システム１００の概略構成図である。 FIG. 5 is a schematic configuration diagram of a distributed power distribution system 100 according to the fourth embodiment.
　実施例４について図５を用いて説明する。 Example 4 will be explained using FIG. 5.
　実施例１においては、受電制御装置１５は、図示しない零相電流センサからの出力に基づいて、保護用遮断器８ｃを遮断する構成となっていたが、本実施例４では、分散電源サイト２１内の受電制御装置１５と単独運転防止装置１８で、第2零相変流器２ａとコンデンサ形地絡検出装置１１を共用する。 In the first embodiment, the power reception control device 15 was configured to shut off the protective circuit breaker 8c based on the output from the zero-phase current sensor (not shown), but in the fourth embodiment The second zero-phase current transformer 2a and the capacitor type ground fault detection device 11 are shared by the power reception control device 15 and the islanding prevention device 18 in the power receiving control device.
　つまり、単独運転防止装置１８および受電制御装置１５には、第２零相変流器２ａの出力信号およびコンデンサ形地絡検出器１１の出力信号が供給され、第２零相変流器２ａの出力信号またはコンデンサ形地絡検出器１１の出力信号に従って解列用遮断器８ｂを開閉する。 In other words, the islanding prevention device 18 and the power receiving control device 15 are supplied with the output signal of the second zero-phase current transformer 2a and the output signal of the capacitor type ground fault detector 11, and the output signal of the second zero-phase current transformer 2a is supplied. The parallel disconnecting circuit breaker 8b is opened and closed according to the output signal or the output signal of the capacitor type ground fault detector 11.
　これにより、上記零相電流センサを省略することができる。 Thereby, the above-mentioned zero-phase current sensor can be omitted.
　実施例４によれば、実施例１と同様な効果を得ることができる他、上記零相電流センサを省略することができ、部品点数を削減することができる。 According to the fourth embodiment, in addition to obtaining the same effects as the first embodiment, the zero-phase current sensor can be omitted, and the number of parts can be reduced.
　なお、実施例４は、上述した実施例２や実施例３に適用することも可能である。 Note that Embodiment 4 can also be applied to Embodiment 2 and Embodiment 3 described above.
　１・・・配電用変電所、２a・・・第２零相変流器、２ｂ・・・第３零相変流器、４・・・第１零相変流器、３ａ・・・第1接地形計器用変圧器、３ｂ・・・第２接地形計器用変圧器、３ｃ・・・第３接地形計器用変圧器、５・・・高圧配電線、７ａ、７ｂ・・・電源、８ａ・・・送り出し遮断器、８ｂ・・・解列用遮断器、８ｃ・・・保護用遮断器、９ａ～９ｈ・・・自動開閉器、１０ａ、１０ｂ、１０ｃ・・・高圧需要家（電力需要部）、１１・・・コンデンサ形地絡検出装置、１４・・・開閉保護装置、１５・・・受電制御装置、１７ａ・・・抑制用スイッチ、１７ｂ・・・高抵抗接地スイッチ、１８・・・単独運転防止装置、２１・・・分散電源サイト、２２・・・負荷、２３・・・保護用変圧器、２４・・・配電自動化システム（配電自動化部）、３０ａ、３０ｂ・・・一線地絡事故、１００・・・分散電源配電システム、２００・・・配電系統 DESCRIPTION OF SYMBOLS 1... Distribution substation, 2a... 2nd zero-phase current transformer, 2b... 3rd zero-phase current transformer, 4... 1st zero-phase current transformer, 3a... th 1 Grounding plane instrument transformer, 3b... Second grounding plane instrument transformer, 3c... Third grounding plane instrument transformer, 5... High voltage distribution line, 7a, 7b... Power supply, 8a... Sending circuit breaker, 8b... Line breaking circuit breaker, 8c... Protective circuit breaker, 9a to 9h... Automatic switch, 10a, 10b, 10c... High voltage consumer (electric power demand section), 11... Capacitor type ground fault detection device, 14... Switching protection device, 15... Power receiving control device, 17a... Suppression switch, 17b... High resistance grounding switch, 18... ... Islanding prevention device, 21 ... Distributed power supply site, 22 ... Load, 23 ... Protective transformer, 24 ... Power distribution automation system (power distribution automation department), 30a, 30b ... Line Ground fault accident, 100... Distributed power distribution system, 200... Power distribution system

Claims (6)

  1. 　電力需要部に、自動開閉器を介して電力を供給する配電系統と、
    　電源と、単独運転防止装置と、高圧配電線に接続され、前記単独運転防止装置の出力信号に基づいて開閉される解列用遮断器と、前記単独運転防止装置の抑制用スイッチと、第２接地形計器用変圧器と、高抵抗接地スイッチと、を有し、前記配電系統に前記高圧配電線を介して接続され、負荷に電力を供給する分散電源サイトと、
    　を備え、
    　地絡事故時に、前記分散電源サイトの前記電源を起点として、前記配電系統に逆潮流させる逆潮流時に、一時的に前記第２接地形計器用変圧器を用いて前記分散電源サイトの中性点を、前記高抵抗接地スイッチを介して接地されることを特徴とする分散電源配電システム。     A power distribution system that supplies power to the power demand section via an automatic switch;
    a power supply, an islanding prevention device, a parallel disconnection circuit breaker connected to a high-voltage distribution line and opened and closed based on an output signal of the islanding prevention device, a suppressing switch for the islanding prevention device, and a second a distributed power source site that has a grounded instrument transformer and a high resistance ground switch, is connected to the power distribution system via the high voltage distribution line, and supplies power to a load;
    Equipped with
    In the event of a ground fault, when reverse power flows from the power source of the distributed power source site to the distribution system, the second ground voltage instrument transformer is temporarily used to temporarily connect the neutral point of the distributed power source site to the power distribution system. is grounded via the high resistance grounding switch.
  2. 　請求項１に記載の分散電源配電システムにおいて、
    　前記分散電源サイトは、保護用変圧器と、第３零相変流器と、第３接地形計器用変圧器と、保護用遮断器と、 開閉保護装置と、を備え、
    　前記電源は、前記保護用遮断器、前記第３零相変流器および前記保護用変圧器を介して前記分散電源サイトの前記中性点および前記負荷に接続され、前記第３零相変流器が事故電流を検出すると、前記開閉保護装置は、前記保護用遮断器を遮断することを特徴とする分散電源配電システム。      The distributed power distribution system according to claim 1,
    The distributed power source site includes a protection transformer, a third zero-phase current transformer, a third ground voltage instrument transformer, a protection circuit breaker, and a switching protection device,
    The power source is connected to the neutral point and the load of the distributed power source site via the protective circuit breaker, the third zero-phase current transformer, and the protective transformer, and the third zero-phase current transformer 1. A distributed power supply distribution system, wherein the switching protection device interrupts the protective circuit breaker when the circuit breaker detects a fault current.
  3. 　請求項１に記載の分散電源配電システムにおいて、
    　前記分散電源サイトの前記解列用遮断器、前記抑制用スイッチおよび前記高抵抗接地スイッチの開閉動作を、前記単独運転防止装置からの出力信号に基づいて制御することを特徴とする分散電源配電システム。     The distributed power distribution system according to claim 1,
    A distributed power supply distribution system characterized in that opening and closing operations of the parallel disconnection circuit breaker, the suppression switch, and the high resistance grounding switch of the distributed power supply site are controlled based on an output signal from the islanding prevention device. .
  4. 　請求項１に記載の分散電源配電システムにおいて、
    　前記分散電源サイトは、前記分散電源サイト内の前記高圧配電線に配置される第２零相変流器と、コンデンサ形地絡検出器と、受電制御装置と、を備え、
    　前記単独運転防止装置および前記受電制御装置は、前記第２零相変流器の出力信号および前記コンデンサ形地絡検出器の出力信号が供給され、前記第２零相変流器の出力信号または前記コンデンサ形地絡検出器の出力信号に従って前記解列用遮断器を開閉することを特徴とする分散電源配電システム。     The distributed power distribution system according to claim 1,
    The distributed power source site includes a second zero-phase current transformer disposed on the high voltage distribution line in the distributed power source site, a capacitor type ground fault detector, and a power reception control device,
    The islanding prevention device and the power reception control device are supplied with the output signal of the second zero-phase current transformer and the output signal of the capacitor-type ground fault detector, and the output signal of the second zero-phase current transformer or A distributed power supply distribution system characterized in that the parallel disconnection circuit breaker is opened and closed according to the output signal of the capacitor type ground fault detector.
  5. 　電力需要部に、自動開閉器を介して電力を供給する配電系統と、高圧配電線により、前記配電系統とに接続され、負荷に電力を供給する分散電源サイトとを備える分散電源システムの制御方法において、
    　地絡事故時に、前記分散電源サイトの電源を起点として、前記配電系統に逆潮流させる逆潮流時に、一時的に第２接地形計器用変圧器を用いて前記分散電源サイトの中性点を、高抵抗接地スイッチを介して接地することを特徴とする分散電源配電システムの制御方法。     A method for controlling a distributed power supply system comprising a power distribution system that supplies power to a power demand unit via an automatic switch, and a distributed power supply site that is connected to the power distribution system through a high-voltage distribution line and supplies power to a load. In,
    In the event of a ground fault, when reverse power flows from the power source at the distributed power source site to the distribution system, the neutral point of the distributed power source site is temporarily connected to the neutral point of the distributed power source site using a second ground voltage instrument transformer. A method for controlling a distributed power distribution system characterized by grounding through a high resistance grounding switch.
  6. 　請求項５に記載の分散電源配電システムの制御方法において、
    　前記電源は、保護用遮断器、第３零相変流器および保護用変圧器を介して前記分散電源サイトの前記中性点および前記負荷に接続されており、前記第３零相変流器が事故電流を検出すると、前記保護用遮断器を遮断することを特徴とする分散電源配電システムの制御方法。     The method for controlling a distributed power distribution system according to claim 5,
    The power source is connected to the neutral point and the load of the distributed power source site via a protective circuit breaker, a third zero-phase current transformer, and a protective transformer, and the third zero-phase current transformer 1. A method for controlling a distributed power distribution system, comprising: cutting off the protective circuit breaker when the protection circuit breaker detects a fault current.
PCT/JP2023/017998 2022-07-25 2023-05-12 Distributed electric power source electric power distribution system and method for controlling distributed electric power source electric power distribution system WO2024024214A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148098A (en) * 2007-12-14 2009-07-02 Toshiba Corp System, method, and program for performing distribution line automatic control
JP2011155795A (en) * 2010-01-28 2011-08-11 Toshiba Corp Photovoltaic generation operation system
JP2014082851A (en) * 2012-10-15 2014-05-08 Chuden Gijutsu Consultant Kk Power supply system and power supply method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009148098A (en) * 2007-12-14 2009-07-02 Toshiba Corp System, method, and program for performing distribution line automatic control
JP2011155795A (en) * 2010-01-28 2011-08-11 Toshiba Corp Photovoltaic generation operation system
JP2014082851A (en) * 2012-10-15 2014-05-08 Chuden Gijutsu Consultant Kk Power supply system and power supply method

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