JPH1169632A - Solar power generation system - Google Patents
Solar power generation systemInfo
- Publication number
- JPH1169632A JPH1169632A JP9218858A JP21885897A JPH1169632A JP H1169632 A JPH1169632 A JP H1169632A JP 9218858 A JP9218858 A JP 9218858A JP 21885897 A JP21885897 A JP 21885897A JP H1169632 A JPH1169632 A JP H1169632A
- Authority
- JP
- Japan
- Prior art keywords
- power converter
- power
- contact
- line
- interconnection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽電池を用いた
電源装置を商用電源と電気的に接続して、共通の負荷に
電力を供給するように系統連系運転を行なう太陽光発電
システムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photovoltaic power generation system in which a power supply device using a solar cell is electrically connected to a commercial power supply to perform a system interconnection operation so as to supply power to a common load. Things.
【０００２】[0002]
【従来の技術】近年、二酸化炭素による地球温暖化の防
止対策の一つとして、住宅に自家発電用として太陽電池
を設置し、太陽電池により得られた電力を電力変換し商
用電源との系統連系運転を行なうことが考えられてい
る。つまり、太陽電池より出力される直流電力をインバ
ータ回路を用いて交流電力に電力変換し、商用電源との
間で送電系統を連絡して系統連系を行なうのである。こ
のような自家発電と商用電源との系統連系運転について
は、社団法人日本電気協会より発行されている分散型電
源系統連系技術指針（以下、指針と略称する）などに技
術的指針が示されている。この指針は、商用電源による
供給電力の品質、保安、信頼性、保護協調を確保して、
円滑な系統連系運転を行なうために示されている。2. Description of the Related Art In recent years, as one of measures to prevent global warming due to carbon dioxide, a solar cell is installed in a house for private power generation, the electric power obtained by the solar cell is converted into electric power, and the system is connected to a commercial power supply. It is considered to perform system operation. That is, DC power output from a solar cell is converted into AC power using an inverter circuit, and a power transmission system is communicated with a commercial power supply to perform system interconnection. Technical guidelines for such grid-connected operation between private power generation and commercial power are shown in the Technical Guidelines for Distributed Power System Interconnection (hereinafter abbreviated as guidelines) issued by the Japan Electrical Association. Have been. This guideline ensures the quality, security, reliability, and protection coordination of power supplied by commercial power,
It is shown for smooth interconnection operation.
【０００３】ところで、太陽光発電システムとしては、
図８に示すように、単相３線の商用電源ＡＣから電流制
限器（以下、リミッタという）１１および漏電ブレーカ
よりなる主幹ブレーカ１２を介して接続されている幹線
Ｌｍに、連系ブレーカ２１および解列開閉器２２ａ，２
２ｂを介して太陽電池２０の出力を電力変換する電力変
換器２３を接続したものがある。リミッタ１１は需要家
の負荷電流を電力会社との間の契約値以下に制限するた
めに設けられたブレーカである。電力変換器２３は上述
のようにインバータ回路を用いたものであり、太陽電池
２０から出力された直流電圧を交流電圧に変換する機能
を有している。主幹ブレーカ１２と連系ブレーカ２１と
の間の幹線Ｌｍには、それぞれ分岐ブレーカ１３を介し
て複数の分岐回路Ｌｂが接続されている。リミッタ１
１、主幹ブレーカ１２、分岐ブレーカ１３、連系ブレー
カ２１、解列開閉器２２ａ，２２ｂは分電盤１に収納さ
れ、太陽電池２０は住宅の屋根などに設置され、電力変
換器２３は太陽電池２０との間の配線をできるだけ短く
するために住宅の屋外に配置される。太陽電池２０と電
力変換器２３との配線を短くし屋外に配置するのは、太
陽電池２０と電力変換器２３との間では直流電流が流れ
るから損失を増加させないためであり、また、太陽電池
２０の最大出力電圧は３００Ｖ程度になるから高圧の配
線が人に触れる可能性を低減して安全性を高めるためで
ある。By the way, as a photovoltaic power generation system,
As shown in FIG. 8, an interconnection breaker 21 and a trunk line Lm connected from a single-phase three-line commercial power supply AC to a trunk line Lm connected via a current limiter (hereinafter referred to as a limiter) 11 and a main trunk breaker 12 composed of an earth leakage breaker. Off-line switches 22a, 2
In some cases, a power converter 23 for converting the output of the solar cell 20 into electric power is connected via the power converter 2b. The limiter 11 is a breaker provided to limit a load current of a customer to a value not more than a contract value with a power company. The power converter 23 uses the inverter circuit as described above, and has a function of converting a DC voltage output from the solar cell 20 into an AC voltage. A plurality of branch circuits Lb are connected to the trunk line Lm between the main breaker 12 and the interconnection breaker 21 via the branch breakers 13, respectively. Limiter 1
1, the main breaker 12, the branch breaker 13, the interconnection breaker 21, the disconnecting switches 22a and 22b are housed in the distribution board 1, the solar cell 20 is installed on the roof of a house, etc., and the power converter 23 is a solar cell. In order to make the wiring between them as short as possible, they are placed outdoors in a house. The reason why the wiring between the solar cell 20 and the power converter 23 is shortened and arranged outdoors is that a direct current flows between the solar cell 20 and the power converter 23 so that the loss does not increase. The maximum output voltage of the 20 is about 300 V, so that the possibility of the high voltage wiring touching a person is reduced and safety is improved.
【０００４】解列開閉器２２ａ，２２ｂは、異常時や商
用電源ＡＣの停電時に商用電源ＡＣと電力変換器２３と
を切り離すために設けられている。つまり、解列開閉器
２２ａ，２２ｂがオンのときに系統連系が行なわれ、解
列開閉器２２ａ，２２ｂがオフの状態（つまり、解列さ
れた状態）では系統分離がなされる。なお、前記指針に
よれば、解列開閉器２２ａ，２２ｂは系統連系を行なう
２系統の間に２個の接点を挿入するのが望ましい。The disconnecting switches 22a and 22b are provided to disconnect the commercial power supply AC from the power converter 23 in the event of an abnormality or a power failure of the commercial power supply AC. That is, the system interconnection is performed when the disconnection switches 22a and 22b are on, and the system is separated when the disconnection switches 22a and 22b are off (that is, in the disconnected state). According to the above guidelines, it is desirable that two contacts are inserted between the two systems for disconnecting switches 22a and 22b for system interconnection.
【０００５】ところで、解列開閉器２２ａ，２２ｂは系
統連系保護装置２５により異常あるいは商用電源ＡＣの
停電が検出されたときに解列するものであって、系統連
系保護装置２５は連系ブレーカ２１と解列開閉器２２
ａ，２２ｂとの間に挿入されたセンサ２７の出力に基づ
いて異常や停電を検出する。すなわち、センサ２７が幹
線Ｌｍに流れる電流、線間の電圧を検出し、系統連系保
護装置２５に引き渡すことにより、異常や停電を検出す
ることができる。解列開閉器２２ａ，２２ｂは電力変換
器２３と分岐ブレーカ１３との間に挿入されているか
ら、異常時や停電時には太陽電池２０による発電が行な
われていても分岐回路Ｌｂには電力を供給することがで
きなくなる。そこで、電力変換器２３と解列遮断器２２
ａ，２２ｂとの間に共用分岐ブレーカ２４を介して共用
分岐回路Ｌｃを接続することが提案されている。このよ
うな共用分岐回路Ｌｃを設ければ、系統連系時と系統分
離時とにかかわらず、共用分岐回路Ｌｃへの電力供給が
可能になる。つまり、異常時や停電時であっても電力変
換器２３から正常に出力が得られていれば共用分岐回路
Ｌｃへの電力供給が可能になる。その結果、電話機など
の通信機器のように優先的に電力を供給する必要がある
負荷に電力を供給できる可能性が高くなる。The disconnecting switches 22a and 22b are disconnected when an abnormality or a power failure of the commercial power supply AC is detected by the system interconnection protection device 25. Breaker 21 and disconnection switch 22
a and 22b are detected based on the output of the sensor 27 inserted between the first and second sensors 22a and 22b. That is, the sensor 27 detects the current flowing through the main line Lm and the voltage between the lines, and transfers the detected current to the system interconnection protection device 25, whereby an abnormality or a power failure can be detected. Since the paralleling switches 22a and 22b are inserted between the power converter 23 and the branch breaker 13, power is supplied to the branch circuit Lb at the time of abnormality or power failure even if the solar cell 20 generates power. You can't do that. Therefore, the power converter 23 and the parallel-off circuit breaker 22
It has been proposed to connect a shared branch circuit Lc between the common branch circuit Lc and the common branch circuit Lc via the common branch breaker 24. If such a common branch circuit Lc is provided, power can be supplied to the common branch circuit Lc regardless of whether the system is connected to the system or separated from the system. In other words, power can be supplied to the shared branch circuit Lc even when an abnormality or power failure occurs, as long as the output is normally obtained from the power converter 23. As a result, there is a high possibility that power can be supplied to a load that needs to supply power preferentially, such as a communication device such as a telephone.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上述の太陽
光発電システムでは、解列開閉器２２ａ，２２ｂが分電
盤１に収納されているから、系統連系保護装置２５も分
電盤１内に収納されることになる。系統連系保護装置２
５は、系統連系時か系統分離時かに応じて電力変換器２
３が対応する動作を行なうように、系統連系か系統分離
かを電力変換器２３に通知する機能を有しており、系統
連系保護装置２５と電力変換器２３との間は信号線Ｌｓ
で接続されている。したがって、解列開閉器２２ａ，２
２ｂが分電盤１内に配置されていると、太陽電池２０の
近傍に配置される電力変換器２３との間の信号線Ｌｓが
長くなり、耐ノイズ性能が低くなるという問題が生じ
る。つまり、電力変換器２３において系統連系か系統分
離かが誤認識され、誤動作を生じるおそれがある。In the above-described photovoltaic power generation system, since the disconnecting switches 22a and 22b are housed in the distribution board 1, the grid connection protection device 25 is also provided in the distribution board 1. It will be stored in. Grid connection protection device 2
5 is a power converter 2 depending on whether the system is connected or disconnected.
3 has a function of notifying the power converter 23 of system interconnection or system separation so that the corresponding operation is performed. A signal line Ls is provided between the system interconnection protection device 25 and the power converter 23.
Connected by Therefore, the parallel-off switches 22a, 22
When 2b is arranged in distribution board 1, signal line Ls between power converter 23 arranged near solar cell 20 becomes long, and there is a problem that noise resistance is reduced. That is, the power converter 23 may erroneously recognize whether the system is connected to the system or separated from the system, and may cause a malfunction.
【０００７】本発明は上記事由に鑑みて為されたもので
あり、その目的は、解列開閉器と電力変換器とを近接し
て設けることができるようにし、信号線を短くして耐ノ
イズ性を高め誤動作を防止した太陽光発電システムを提
供することにある。The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to dispose a disconnecting switch and a power converter in close proximity, to shorten a signal line, and to reduce noise. An object of the present invention is to provide a photovoltaic power generation system which has improved performance and prevents malfunction.
【０００８】[0008]
【課題を解決するための手段】請求項１の発明は、太陽
電池と、太陽電池から出力される直流を交流に変換する
電力変換器と、商用電源に接続された幹線と電力変換器
との間に挿入され系統連系と系統分離との切換を行なう
解列開閉器と、電力変換器と解列開閉器との間の電路か
ら負荷に電力を供給する共用分岐回路と、異常や商用電
源の停電を検出すると解列開閉器を駆動して系統分離を
行なうとともに電力変換器に通知する系統連系保護装置
と、商用電源に少なくとも主幹ブレーカを介して接続さ
れた幹線と、幹線と解列開閉器との間に挿入された連系
ブレーカとを備え、主幹ブレーカと連系ブレーカとは分
電盤に収納され、解列開閉器は分電盤外に配置されてい
るものである。この構成によれば、解列開閉器を分電盤
外に設けていることによって太陽電池に近接して配置さ
れる電力変換器と解列開閉器との距離を小さくすること
ができ、結果的に解列開閉器を駆動する系統連系保護装
置と電力変換器との距離を小さくすることで系統連系保
護装置と電力変換器との間の信号線を短くすることがで
き、耐ノイズ性が高くなるのである。According to the first aspect of the present invention, there is provided a solar cell, a power converter for converting a direct current output from the solar cell to an alternating current, and a main line connected to a commercial power supply and a power converter. A disconnecting switch inserted between them to switch between system interconnection and system separation; a shared branch circuit that supplies power to the load from the power path between the power converter and the disconnecting switch; When a power failure is detected, the system disconnection switch is driven to separate the system and notify the power converter of the system interconnection, a trunk line connected to the commercial power supply via at least the main breaker, and the trunk line is disconnected. An interconnection breaker inserted between the switch and the main switch is provided, the main breaker and the interconnection breaker are housed in a distribution board, and the off-switch is arranged outside the distribution board. According to this configuration, the distance between the power converter arranged close to the solar cell and the disconnection switch can be reduced by providing the disconnection switch outside the distribution board, and as a result, By reducing the distance between the power grid and the power grid, the signal line between the grid protection power grid and the power converter can be shortened. Is higher.
【０００９】請求項２の発明は、請求項１の発明におい
て、電力変換器が系統分離時に系統連系時より出力電圧
を引上げるように構成され、電力変換器と共用分岐回路
との間には切換開閉器が設けられ、切換開閉器には、電
力変換器の第１の出力線を系統分離時に共用分岐回路に
接続する第１の接点と、電力変換器の第１の出力線の出
力電圧を分圧して出力する電力変換器の第２の出力線を
系統連系時に共用分岐回路に接続する第２の接点と、第
１の接点と第２の接点とが同時にオンになるのを防止す
るようにインタロックを行なうインタロック手段とが設
けられているものである。この構成によれば、電力変換
器と共用分岐回路との間に挿入した第１の接点と第２の
接点とが同時にオンになることを禁止するためにインタ
ロック手段を設けているから、第１の接点と第２の接点
とが同時にオンになるのを確実に防止し、電力変換器の
２本の出力線の短絡を防止することができる。According to a second aspect of the present invention, in the first aspect of the present invention, the power converter is configured to increase the output voltage from the time of system interconnection when the power system is separated, and the power converter is connected between the power converter and the common branch circuit. Is provided with a switching switch. The switching switch has a first contact for connecting the first output line of the power converter to the shared branch circuit when the system is separated, and an output of the first output line of the power converter. The second contact connecting the second output line of the power converter that divides the voltage and outputs the divided output to the shared branch circuit at the time of system interconnection, and the first contact and the second contact are simultaneously turned on. And interlock means for performing interlock so as to prevent the interlock. According to this configuration, the interlock means is provided to prevent the first contact and the second contact inserted between the power converter and the common branch circuit from being simultaneously turned on. It is possible to reliably prevent the first contact and the second contact from being simultaneously turned on, and to prevent a short circuit between the two output lines of the power converter.
【００１０】請求項３の発明は、請求項１の発明におい
て、系統連系保護装置が異常ないし停電の解除を検出す
ると、系統連系運転に自動的に復帰させるものである。
この構成によれば、異常ないし停電によって系統分離さ
れるが、異常ないし停電から復旧すれば自動的に系統連
系運転に復帰するから、復帰操作を行なう面倒がないも
のである。According to a third aspect of the present invention, in the first aspect of the present invention, when the system interconnection protection device detects abnormality or cancellation of a power failure, the system automatically returns to the system interconnection operation.
According to this configuration, the system is separated due to an abnormality or a power failure, but when the system recovers from the abnormality or the power failure, the system automatically returns to the system interconnection operation.
【００１１】請求項４の発明は、請求項１の発明におい
て、解列開閉器と系統連系保護装置とを収納した連系保
護盤と、電力変換器を収納したボックスとを分電盤とは
別体に設け、共通分岐回路に挿入される共通分岐ブレー
カを連系保護盤内に収納したものである。この構成によ
れば、解列開閉器と系統連系保護装置とが連系保護盤に
収納され、電力変換器がボックスに収納されるから、系
統連系保護装置と電力変換器とを比較的近接して配置し
ながらも、一般に屋外に設置されることが多いボックス
と分離して連系保護盤を屋内に配置することができる。
しかも、共通分岐ブレーカが連系保護盤内に収納される
から、連系保護盤を屋内に配置しておけば共通分岐ブレ
ーカが遮断されたときに共通分岐ブレーカを屋内で操作
して復帰させることが可能になる。According to a fourth aspect of the present invention, in the first aspect of the present invention, an interconnection protection panel containing a disconnecting switch and a system interconnection protection device and a box containing a power converter are connected to a distribution board. Is provided separately and houses a common branch breaker inserted into the common branch circuit in the interconnection protection panel. According to this configuration, since the disconnecting switch and the grid connection protection device are housed in the grid protection panel and the power converter is housed in the box, the grid connection protection device and the power converter are relatively separated. While being arranged close to each other, the interconnection protection panel can be arranged indoors separately from the box that is generally installed outdoors.
In addition, since the common branch breaker is stored in the interconnection protection panel, if the interconnection protection panel is placed indoors, the common branch breaker can be operated indoors and returned when the common branch breaker is cut off. Becomes possible.
【００１２】請求項５の発明は、請求項２の発明におい
て、解列開閉器と切換開閉器とをそれぞれ２個ずつの常
開接点を備えるリレーを組み合わせて構成したものであ
る。この構成によれば、２個ずつの常開接点を備えるリ
レーのみで解列開閉器と切換開閉器とを構成するから、
比較的安価なリレーのみで解列開閉器および切換開閉器
を構成することができるとともに、部品品種を低減する
ことができ、結果的に全体としてのコストを低減するこ
とが可能になる。According to a fifth aspect of the present invention, in the second aspect of the present invention, the parallel-off switch and the switching switch are each configured by combining a relay having two normally open contacts. According to this configuration, since the parallel-off switch and the switching switch are configured only by the relays each having two normally-open contacts,
The parallel-off switch and the switching switch can be constituted only by relatively inexpensive relays, and the number of parts can be reduced. As a result, the overall cost can be reduced.
【００１３】請求項６の発明は、請求項１の発明におい
て、単相３線式の商用電源に接続される幹線に解列開閉
器を介して接続される電力変換器の３本の出力線のうち
で幹線の中性線に接続される出力線と他の２本の出力線
とにそれぞれ共用分岐回路を接続し、電力変換器におい
て各共用分岐回路への印加電圧をそれぞれ個別に制御す
るものである。この構成によれば、系統連系時と系統分
離時とで電力変換器の出力電圧を変化させておらず、２
系統の共用分岐回路の線間電圧を電力変換器においてそ
れぞれ個別に制御しているから、切換開閉器が不要にな
り接点構成が簡単になる。According to a sixth aspect of the present invention, in the first aspect of the present invention, the three output lines of the power converter are connected to the main line connected to the single-phase three-wire commercial power supply via a disconnecting switch. Among them, the common branch circuit is connected to the output line connected to the neutral line of the main line and the other two output lines respectively, and the voltage applied to each common branch circuit is individually controlled in the power converter. Things. According to this configuration, the output voltage of the power converter is not changed between the time of system interconnection and the time of system separation,
Since the line voltage of the common branch circuit of the system is individually controlled in the power converter, a switching switch is not required and the contact configuration is simplified.
【００１４】[0014]
（実施形態１）本実施形態の基本的な構成は図８に示し
た従来構成と同様であり、図１に示すように、解列開閉
器２２ａ，２２ｂを分電盤１とは別に設けたボックス２
内に収納した点が主な相違点である。(Embodiment 1) The basic configuration of the present embodiment is the same as the conventional configuration shown in FIG. 8, and, as shown in FIG. 1, the disconnection switches 22a and 22b are provided separately from the distribution board 1. Box 2
The main difference is that they are stored inside.
【００１５】すなわち、従来構成と同様に、リミッタ１
１および主幹ブレーカ１２を介して商用電源ＡＣに接続
されている幹線Ｌｍに、連系ブレーカ２１および解列開
閉器２２ａ，２２ｂを介して電力変換器２３が接続され
ている。電力変換器２３は太陽電池２０の直流出力を商
用電源ＡＣと同様の交流に電力変換するものであり、イ
ンバータ回路を主構成としている。また、主幹ブレーカ
１２と連系ブレーカ２１との間の幹線Ｌｍには、それぞ
れ分岐ブレーカ１３を介して複数の分岐回路Ｌｂが接続
される。That is, similar to the conventional configuration, the limiter 1
The power converter 23 is connected to the trunk line Lm connected to the commercial power supply AC via the main power supply 1 and the main breaker 12 via the interconnection breaker 21 and the disconnecting switches 22a and 22b. The power converter 23 converts the DC output of the solar cell 20 into AC similar to the commercial power AC, and has an inverter circuit as a main configuration. A plurality of branch circuits Lb are connected to the trunk line Lm between the main breaker 12 and the interconnection breaker 21 via the branch breakers 13, respectively.
【００１６】ところで、リミッタ１１、主幹ブレーカ１
２、分岐ブレーカ１３、連系ブレーカ２１は従来構成と
同様に分電盤１に収納されるが、解列開閉器２２ａ，２
２ｂは、本実施形態では分電盤１の外部に電力変換器２
３や系統連系保護装置２５とともにユニット化されてボ
ックス２内に収納される。このボックス２は通常は太陽
電池２０に近い屋外に配置され、太陽電池２０から電力
変換器２３に至る経路での直流電力の損失が少なくなる
ようにしてある。電力変換器２３と解列開閉器２２ａ，
２２ｂとの間では共用分岐ブレーカ２４を介して共用分
岐回路Ｌｃが接続される。By the way, the limiter 11, the main breaker 1
2. The branch breaker 13 and the interconnection breaker 21 are housed in the distribution board 1 in the same manner as in the conventional configuration, but the disconnection switches 22a, 2
In this embodiment, a power converter 2b is provided outside the distribution board 1 in this embodiment.
3 and united together with the system interconnection protection device 25 and stored in the box 2. This box 2 is usually arranged outdoors near the solar cell 20 so that the loss of DC power in the path from the solar cell 20 to the power converter 23 is reduced. The power converter 23 and the parallel-off switch 22a,
The common branch circuit Lc is connected to the common branch circuit 22b via the common branch breaker 24.
【００１７】系統連系保護装置２５は連系ブレーカ２１
と解列開閉器２２ａ，２２ｂとの間に挿入されたセンサ
２７の出力に基づいて異常や停電を検出する。センサ２
７は幹線Ｌｍに流れる電流を検出する電流センサと、幹
線Ｌｍの線間の電圧を検出する電圧センサとからなり、
系統連系保護装置２５に電流および電圧の検出値を引き
渡すことにより、系統連系保護装置２５では電圧の変動
や周波数の変動を検出し、これらに異常があれば解列開
閉器２２ａ，２２ｂを解列させる。また、電圧および電
流の変化により商用電源ＡＣの停電を検出することもで
きる。The system interconnection protection device 25 is connected to the interconnection breaker 21.
An abnormality or a power failure is detected based on the output of the sensor 27 inserted between the switching switches 22a and 22b. Sensor 2
7 includes a current sensor for detecting a current flowing through the main line Lm, and a voltage sensor for detecting a voltage between the lines of the main line Lm.
By passing the detected values of the current and the voltage to the grid interconnection protection device 25, the grid interconnection protection device 25 detects the fluctuation of the voltage and the fluctuation of the frequency, and if there is any abnormality, disconnects the disconnection switches 22a and 22b. Disconnect. Further, a power failure of the commercial power supply AC can be detected based on changes in voltage and current.
【００１８】ところで、電力変換器２３は、系統連系時
には２００Ｖ（商用電源が１００Ｖの場合）の交流を出
力し、系統分離時には１００Ｖの交流を出力するように
構成される。系統連系状態か系統分離状態かは系統連系
保護装置２５から信号線Ｌｓを通して通知信号で指示さ
れる。また、電力変換器２３は出力を等分に分圧し、系
統連系時には分圧した中点を幹線Ｌｍの中性線に接続す
る。系統連系時と系統分離時とで電力変換器２３の出力
電圧を切り換えるのは、系統分離時には太陽電池２０の
みが電源となるから、出力電圧を下げることによって電
流容量を確保するためである。このように系統連系時と
系統分離時とでは電力変換器２３の出力電圧が変化する
から、系統連系時と系統分離時とで共用分岐回路Ｌｃの
線間電圧を変化させないためには、電力変換器２３と共
用分岐回路Ｌｃとの接続関係を切り換える手段が必要で
ある。そこで、３極の接点ｒ11〜ｒ13を備える切換開閉
器２９ａと２極の接点ｒ21，ｒ22を備える切換開閉器２
９ｂとを電力変換器２３と共用分岐ブレーカ２４との間
に設けてある。ここにおいて、解列開閉器２２ａ，２２
ｂと切換開閉器２９ａ，２９ｂとは電磁リレーにより構
成されている。Incidentally, the power converter 23 is configured to output an AC of 200 V (when the commercial power supply is 100 V) when the power system is interconnected, and to output an AC of 100 V when the power system is separated. Whether the system interconnection state or the system separation state is indicated by a notification signal from the system interconnection protection device 25 through the signal line Ls. The power converter 23 divides the output into equal parts, and connects the divided midpoint to the neutral line of the main line Lm during system interconnection. The reason why the output voltage of the power converter 23 is switched between the time of system interconnection and the time of system separation is to secure current capacity by lowering the output voltage because only the solar cell 20 is used as a power source during system separation. As described above, since the output voltage of the power converter 23 changes between the time of system interconnection and the time of system isolation, in order not to change the line voltage of the shared branch circuit Lc between the time of system interconnection and the time of system isolation, Means for switching the connection relationship between the power converter 23 and the shared branch circuit Lc is required. Therefore, diverter switch 2 comprising a contact r 21, r 22 of the change-over switch 29a and the two-pole comprising a contact r 11 ~r 13 three-pole
9b is provided between the power converter 23 and the common branch breaker 24. Here, the parallel-off switches 22a, 22
b and the switching switches 29a and 29b are constituted by electromagnetic relays.
【００１９】切換開閉器２９ａの接点ｒ11〜ｒ13と切換
開閉器２９ｂの接点ｒ21，ｒ22とは同時にオンにならな
いように電力変換器２３からの切換信号により制御され
る。切換開閉器２９ａは電力変換器２３からの３線と解
列開閉器２２ｂからの３線との間にそれぞれ接点ｒ11〜
ｒ13を挿入するものであり、すべての接点ｒ11〜ｒ13が
同じ電路に挿入される。ここで、図１において電力変換
器２３からの出力線を上からａ線、ｂ線、ｃ線と呼ぶこ
とにする。切換開閉器２９ｂの一方の接点ｒ22は切換開
閉器２９ａの接点ｒ11〜ｒ13のうちｃ線に挿入された接
点ｒ13と並列に接続される。また、切換開閉器２９ｂの
他方の接点ｒ21は切換開閉器２９ａの接点ｒ11〜ｒ13の
うちａ線に挿入された接点ｒ11と電力変換器２３との間
に一端が接続され、ｂ線に挿入された接点ｒ12と共用分
岐ブレーカ２４との間に他端が接続される。[0019] is controlled by the switching signal from the switching switch 29a of the contact r 11 ~r 13 and diverter switch 29b contacts r 21, the power so as not to turn on at the same time the r 22 converter 23. Diverter switch 29a each contact r 11 ~ between the 3 lines from 3 lines and disconnecting switch 22b from the power converter 23
It is intended to insert the r 13, all of the contacts r 11 ~r 13 are inserted into the same path. Here, in FIG. 1, the output lines from the power converter 23 are referred to as a line, b line, and c line from the top. One contact r 22 of the change-over switch 29b is connected in parallel with the contact r 13 inserted in the line c of the contact r 11 ~r 13 of the change-over switch 29a. Also, other contact r 21 of the change-over switch 29b is connected to one end between the contact point r 11 and power converter 23 inserted in a line of contact r 11 ~r 13 of the change-over switch 29a, b the other end is connected between the contact point r 12, which is inserted in line with the shared branch breakers 24.
【００２０】要するに、共用分岐ブレーカ２４は系統連
系時に幹線Ｌｍの一方の電力線と中性線とに接続される
のであって、系統分離時にはａ線とｃ線との間の線間電
圧が１００Ｖになるから切換開閉器２９ｂはａ線および
ｃ線と共用分岐ブレーカ２４との間に接点ｒ21，ｒ22が
挿入され、系統連系時にはａ線とｃ線との間の線間電圧
が２００Ｖになるから切換開閉器２９ａはｂ線およびｃ
線と共用分岐ブレーカ２４との間に接点ｒ12，ｒ13が挿
入される。言い換えると、系統連系時には共用分岐ブレ
ーカ２４はｂ線とｃ線とに接続され、系統分離時にはａ
線とｃ線とに接続されるのであって、共用分岐ブレーカ
２４の一端は系統連系時と系統分離時とでａ線とｂ線と
の一方に選択的に接続されなければならない。つまり、
切換開閉器２９ａの接点ｒ12と切換開閉器２９ｂの接点
ｒ21とは同時にオンになることが禁止されていなければ
ならない。仮に両接点ｒ12，ｒ21が同時にオンになった
とすると、ａ線とｂ線とが短絡するという問題が生じる
ことになる。In short, the common branch breaker 24 is connected to one of the power line and the neutral line of the main line Lm at the time of system interconnection, and the line voltage between the line a and the line c is 100 V at the time of system separation. contact r 21, r 22 is inserted from becomes between the diverter switch 29b is shared branch breakers 24 and a line and c-line, the line voltage between a line and c-line at the time of system interconnection is 200V , The switching switch 29a is connected to the b-line and c
Contacts r 12 and r 13 are inserted between the line and the common branch breaker 24. In other words, the common branch breaker 24 is connected to the b-line and the c-line at the time of system interconnection,
One end of the common branch breaker 24 must be selectively connected to one of the a-line and the b-line when the system is interconnected and when the system is separated. That is,
Must be prohibited from simultaneously turned on and the contact point r 21 of the contacts r 12 and diverter switch 29b of the change-over switch 29a. If both contacts r 12 and r 21 are turned on at the same time, a problem arises that the a-line and the b-line are short-circuited.
【００２１】両切換開閉器２９ａ，２９ｂは接点ｒ11〜
ｒ13，ｒ21，ｒ22がすべてａ接点（常開接点）であり、
電力変換器２３からの切換信号がなければオフになる。
接点ｒ12と接点ｒ21とが同時にオンにならないようにす
るために、系統連系時には切換開閉器２９ａの接点ｒ11
〜ｒ13をオンにし、切換開閉器２９ｂの接点ｒ21，ｒ 22
をオフにするように切換信号が与えられる。また、系統
分離時には接点ｒ11〜ｒ13がオフになり、接点ｒ21，ｒ
22がオンになる。Both switching switches 29a and 29b are connected to a contact r.11~
r13, Rtwenty one, Rtwenty twoAre all a contacts (normally open contacts),
If there is no switching signal from power converter 23, it is turned off.
Contact r12And contact point rtwenty oneAnd are not turned on at the same time.
Therefore, at the time of system interconnection, the contact r of the switching switch 29a11
~ R13Is turned on, and the contact r of the switching switch 29b is turned on.twenty one, R twenty two
Is turned off. Also,
Contact r at the time of separation11~ R13Is turned off and the contact rtwenty one, R
twenty twoTurns on.
【００２２】一方、センサ２７の出力を監視している系
統連系保護装置２５において異常や停電が検出されなく
なると、系統連系保護装置２５は異常や停電の解除を通
知する通知信号を電力変換器２３に与える。また、同時
に解列開閉器２２ａ，２２ｂに対して系統連系を指示し
て接点をオンにする。電力変換器２３は異常ないし停電
の解除を通知する通知信号を受けると切換開閉器２９ａ
の接点ｒ11〜ｒ13をオンにし、切換開閉器２９ｂの接点
ｒ21，ｒ22をオフにする。この切換は自動的に行なわれ
る。On the other hand, when no abnormality or power failure is detected in the interconnection protection device 25 monitoring the output of the sensor 27, the interconnection protection device 25 converts the notification signal for notifying the abnormality or the cancellation of the power failure to power conversion. To the vessel 23. At the same time, system disconnection is instructed to the parallel-off switches 22a and 22b to turn on the contacts. When the power converter 23 receives the notification signal notifying the abnormality or the cancellation of the power failure, the switching switch 29a
The contact r 11 ~r 13 on and off the contact point r 21, r 22 of the change-over switch 29b. This switching is performed automatically.
【００２３】ところで、両切換開閉器２９ａ，２９ｂの
接点が同時にオンになるのを確実に防止するには、両切
換開閉器２９ａ，２９ｂの接点のインタロックを行なう
のが望ましい。インタロックには、回路構成による電気
的インタロックと、接点構成による機械的インタロック
とが考えられている。電気的インタロックを行なうに
は、たとえば図２のように構成する。この構成では、切
換開閉器２９ｂとして２個のａ接点（常開接点）を備え
た電磁リレーを用いており、解列開閉器２２ａ，２２ｂ
により系統分離が行なわれ、かつ切換開閉器２９ａの接
点ｒ11〜ｒ13がオフになったときに、切換開閉器２９ｂ
の駆動コイルＣｂに通電されるように構成してある。つ
まり、解列開閉器２２ａ，２２ｂおよび切換開閉器２９
ａにそれぞれｂ接点（常閉接点）である補助接点ｒ31〜
ｒ 33を設け、これらの補助接点ｒ31〜ｒ33と切換開閉器
２９ｂの駆動コイルＣｂとの直列回路に切換信号を与え
て切換開閉器２９ｂの接点ｒ21，ｒ22の開閉を行なうの
である。解列開閉器２２ａ，２２ｂおよび切換開閉器２
９ａは補助接点ｒ31〜ｒ33を除いてすべての接点がａ接
点で構成される。The switching switches 29a, 29b are
To ensure that the contacts do not turn on at the same time,
Interlocks the contacts of the switching switches 29a and 29b
It is desirable. The interlock uses electrical
Interlock and mechanical interlock by contact configuration
It is thought that. To perform electrical interlock
Is configured as shown in FIG. 2, for example. In this configuration,
Equipped with two a contacts (normally open contacts) as switching switches 29b
Parallel relays 22a, 22b
And the switching of the switching switch 29a is performed.
Point r11~ R13When the switch is turned off, the switching switch 29b
Of the drive coil Cb. One
In other words, the parallel-off switches 22a and 22b and the switching switch 29
a is an auxiliary contact r which is a b contact (normally closed contact)31~
r 33And these auxiliary contacts r31~ R33And switchgear
A switching signal is given to a series circuit with the drive coil Cb of 29b.
Contact r of the switching switch 29btwenty one, Rtwenty twoOpen and close
It is. Off-line switches 22a and 22b and switching switch 2
9a is an auxiliary contact r31~ R33All contacts are a contacts except
Consists of points.
【００２４】解列開閉器２２ａ，２２ｂは系統分離を行
なうと補助接点ｒ31，ｒ32をオンにし、このとき電力変
換器２３に通知信号が与えられて電力変換器２３の出力
電圧が１００Ｖに切り換えられる。また、切換開閉器２
９ａは系統連系保護装置２５からの通知信号を受けると
切換開閉器２９ａの接点ｒ11〜ｒ13をオフにし、その結
果、補助接点ｒ33がオンになる。つまり、駆動コイルＣ
ｂに直列接続された３個の補助接点ｒ31〜ｒ33がすべて
オンになる。このとき、電力変換器２３から切換開閉器
２９ｂのコイルＣｂに切換信号が与えられ、補助接点ｒ
31〜ｒ33を通して駆動コイルＣｂに通電され、接点
ｒ21，ｒ22がオンになるのである。図２の構成では切換
開閉器２９ａの接点ｒ11〜ｒ13がオフでなければ補助接
点ｒ33がオンにならないから、切換開閉器２９ａの接点
ｒ11〜ｒ13と切換開閉器２９ｂの接点ｒ21，ｒ22とが同
時にオンになるのを防止することができ、ａ線とｂ線と
の短絡を防止することができる。ここで、ａ線とｂ線と
の短絡防止は系統連系時にも行なわれていなければなら
ないから、解列開閉器２２ａ，２２ｂの補助接点ｒ31，
ｒ33も駆動コイルＣｂに直列接続してある。つまり、解
列開閉器２２ａ，２２ｂにより系統分離が行なわれてい
なければａ線とｂ線との間に挿入された接点ｒ21がオン
になることがないから、このことによってもａ線とｂ線
との短絡が確実に防止されることになる。When the disconnection switches 22a and 22b perform system separation, the auxiliary contacts r 31 and r 32 are turned on. At this time, a notification signal is given to the power converter 23 and the output voltage of the power converter 23 becomes 100V. Can be switched. Switching switch 2
9a turns off the contact r 11 ~r 13 of receiving the diverter switch 29a the notice signal from the system interconnection protection device 25, as a result, auxiliary contacts r 33 is turned on. That is, the driving coil C
connected in series of three auxiliary contacts r 31 ~r 33 was is all turned on b. At this time, a switching signal is given from the power converter 23 to the coil Cb of the switching switch 29b, and the auxiliary contact r
31 is energized the driving coil Cb through ~r 33, is the contact point r 21, r 22 is turned on. Since the contact r 11 ~r 13 of the change-over switch 29a in the configuration of FIG. 2 is an auxiliary contact r 33 If off does not turn on, the contacts r of the contact r 11 ~r 13 and diverter switch 29b of the change-over switch 29a 21, and r 22 can be prevented from becoming oN simultaneously, it is possible to prevent a short circuit between a line and the line b. Here, the prevention of the short circuit between the a-line and the b-line must be performed also at the time of system interconnection, and therefore, the auxiliary contacts r 31 , of the parallel-off switches 22a, 22b.
r 33 also are connected in series to the driving coil Cb. That is, since the contact r 21 is never turned on, which is inserted between the disconnection switch 22a, a wire and b wire if not performed strains isolated by 22b, and a line This also b A short circuit with the wire is reliably prevented.
【００２５】一方、機械的インタロックを行なうには、
図３のような構成を採用すればよい。これは、切換開閉
器２９ａ，２９ｂを設ける代わりに２個のａ接点ｒ41，
ｒ42とと１個のｂ接点ｒ43とを備える切換開閉器２９を
設けたものである。ここで、図１に示した回路構成の動
作から明らかなように、両切換開閉器２９ａ，２９ｂの
接点ｒ13，ｒ22は同時にオンになることはないが、どち
らがオンでも電気的な接続関係に変化がないから、図３
に示す構成では両接点ｒ13，ｒ22に相当する接点は省略
してある。また、切換開閉器２９ａの接点ｒ11は系統連
系時にオン、系統分離時にオフになるものであるから、
これに相当する接点ｒ41を設け、さらに、接点ｒ12と接
点ｒ21とに相当する接点として接点ｒ42，ｒ43を設けて
ある。つまり、両接点ｒ42，ｒ43は一端を共用分岐ブレ
ーカ２４の一端に接続し、接点ｒ 42の他端は電力変換器
２３の出力線のうちのｂ線に接続し、接点ｒ43の他端は
電力変換器２３の出力線のうちのａ線に接続している。
ここで、接点ｒ12と接点ｒ 21とは同時にオンになること
が禁止されるから、接点ｒ42をａ接点、接点ｒ43をｂ接
点とすることによりインタロックを行なっているのであ
る。On the other hand, to perform the mechanical interlock,
What is necessary is just to employ | adopt the structure like FIG. This is switching open / close
Instead of providing the devices 29a and 29b, two a contacts r41,
r42And one b contact r43Switching switch 29 having
It is provided. Here, the operation of the circuit configuration shown in FIG.
As is clear from the work, both switching switches 29a, 29b
Contact r13, Rtwenty twoAre not turned on at the same time,
Even if they are on, there is no change in the electrical connection relationship.
In the configuration shown in FIG.13, Rtwenty twoContact points corresponding to are omitted
I have. Also, the contact r of the switching switch 29a11Is the grid
Because it is on when the system is off and off when the system is separated,
The corresponding contact r41And a contact r12Contact with
Point rtwenty oneContact r as a contact corresponding to42, R43With
is there. That is, both contact points r42, R43At one end
Connected to one end of the 42The other end is a power converter
Of the 23 output lines, the contact r43The other end of
The output line of the power converter 23 is connected to the line a.
Here, the contact r12And contact point r twenty oneIs turned on at the same time
Is prohibited, the contact r42Is a contact, contact r43B contact
Interlock is performed by setting
You.
【００２６】（実施形態２）実施形態１では解列開閉器
２２ａ，２２ｂと電力変換器２３とをボックス２に収納
していたが、本実施形態では図４に示すように、解列開
閉器２２ａ，２２ｂと系統連系保護装置２５と共通分岐
ブレーカ２４とセンサ２７とを分電盤１およびボックス
２ａとは別体の連系保護盤４に収納し、ボックス２ａ内
には電力変換器２３と切換開閉器２９ａ，２９ｂとを収
納している。(Embodiment 2) In Embodiment 1, the disconnection switches 22a and 22b and the power converter 23 are housed in the box 2, but in this embodiment, as shown in FIG. 22a, 22b, the system interconnection protection device 25, the common branch breaker 24, and the sensor 27 are housed in the interconnection protection panel 4 separate from the distribution board 1 and the box 2a, and the power converter 23 is installed in the box 2a. And switching switches 29a and 29b.
【００２７】この構成では、系統連系保護装置２５と電
力変換器２３との間の信号線Ｌｓは実施形態１に比較す
れば長くなるが、従来構成に比較すれば短くすることが
可能である。しかも、電力変換器２３を収納したボック
ス２ａは太陽電池２０の近傍に配置されるから一般には
屋外に配置されることになるが、連系保護盤４は屋内に
配置することが可能であり、連系保護盤４を屋内に配置
しておけば共通分岐ブレーカ２４が遮断したときに、屋
内で共通分岐ブレーカ２４を操作して復旧させることが
できて操作が容易になる。他の構成および動作は実施形
態１と同様である。In this configuration, the signal line Ls between the system interconnection protection device 25 and the power converter 23 is longer than in the first embodiment, but can be shorter than in the conventional configuration. . Moreover, since the box 2a containing the power converter 23 is arranged near the solar cell 20, it is generally arranged outdoors, but the interconnection protection panel 4 can be arranged indoors. If the interconnection protection panel 4 is arranged indoors, when the common branch breaker 24 is cut off, the common branch breaker 24 can be operated and restored indoors to facilitate the operation. Other configurations and operations are the same as those of the first embodiment.
【００２８】（実施形態３）実施形態１では、解列開閉
器２２ａ，２２ｂや切換開閉器２９ａとして３個のａ接
点を備えるものを用いていたが、図５に示すように、本
実施形態では解列開閉器２２ａ，２２ｂおよび切換開閉
器２９ａ，２９ｂを２個のａ接点を備える電磁リレーの
みで構成したものである。図１に示した実施形態１の構
成では、解列開閉器２２ａ，２２ｂとしてそれぞれ３個
のａ接点を備える電磁リレーを用いていたのに対して、
本実施形態では２個のａ接点を備える電磁リレーを用い
るのであって、指針によれば系統連系を行なう２系統の
間に２個の接点を設けるのであるから、幹線Ｌｍのうち
共用分岐回路Ｌｃに接続されている２線に、解列開閉器
２２ａ，２２ｂの２個ずつの接点を挿入することによっ
て、３線のうちの２線については指針を満足することが
できる。(Embodiment 3) In Embodiment 1, the one having three a-contacts is used as the disconnecting switches 22a and 22b and the switching switch 29a. However, as shown in FIG. In this example, the parallel-off switches 22a and 22b and the switching switches 29a and 29b are constituted only by electromagnetic relays having two a contacts. In the configuration of the first embodiment shown in FIG. 1, electromagnetic relays each having three a contacts are used as the disconnection switches 22a and 22b.
In the present embodiment, an electromagnetic relay having two a-contacts is used. According to the guideline, two contacts are provided between two systems that perform system interconnection. By inserting two contacts of each of the parallel-off switches 22a and 22b into the two wires connected to Lc, the guideline can be satisfied for two of the three wires.
【００２９】一方、図１に示した実施形態１の構成で
は、切換開閉器２９ａが３個のａ接点を備えていたか
ら、これを２個のａ接点を持つ電磁リレーで構成しよう
とすれば、２組の電磁リレーが必要になる。そこで、同
時にオンオフされる２個の切換開閉器２９ａ1 ，２９ａ
2 を設け、電力変換器２３の出力線のうちのａ線には２
個の切換開閉器２９ａ1 ，２９ａ2 の接点ｒ111 ，ｒ
112 を直列に挿入し、各切換開閉器２９ａ1 ，２９ａ2
の残りの接点ｒ121 ，ｒ122 をそれぞれｂ線とｃ線とに
挿入する。この構成によって、解列開閉器２２ａ，２２
ｂの接点が挿入されていない１線についても切換開閉器
２９ａ1 ，２９ａ2 の２個の接点ｒ111 ，ｒ11 2 が挿入
されることになり指針を満足することになる。On the other hand, in the configuration of the first embodiment shown in FIG. 1, since the switching switch 29a has three a-contacts, if this is to be constituted by an electromagnetic relay having two a-contacts, A set of electromagnetic relays is required. Therefore, two switching switches 29a 1 and 29a which are simultaneously turned on and off are provided.
2 is provided, and the output line of the power
Contacts r 111 , r of the switching switches 29a 1 , 29a 2
112 are inserted in series, and each switching switch 29a 1 , 29a 2
Inserting the remaining contacts r 121, r 122 to the b line and c-line, respectively. With this configuration, the disconnection switches 22a, 22
two contacts r 111, r 11 2 of b of diverter switch 29a 1 also 1 line contact is not inserted, 29a 2 is to satisfy the guideline will be inserted.
【００３０】上述のような接点構成とすることによっ
て、系統連系を行なう２系統を接続する電路に２個ずつ
の接点を挿入するという指針を満足しながらも、２個の
ａ接点を備えた電磁リレーのみで構成することができ、
３個のａ接点を備える特殊な電磁リレーを用いる場合に
比較するとコストを低減することが可能になる。また、
２個の解列開閉器２２ａ，２２ｂおよび２個の切換開閉
器２９ａ1 ，２９ａ2 はそれぞれ同時にオンオフされる
のであるから、接点の制御に関しては図１に示した実施
形態１と同様である。By adopting the above-mentioned contact configuration, two a contacts are provided while satisfying the guideline of inserting two contacts into the electric circuit connecting the two systems for system interconnection. Can be configured with only electromagnetic relays,
The cost can be reduced as compared with the case where a special electromagnetic relay having three a contacts is used. Also,
Since the two parallel switches 22a and 22b and the two switching switches 29a 1 and 29a 2 are simultaneously turned on and off at the same time, the control of the contacts is the same as in the first embodiment shown in FIG.
【００３１】なお、指針を満足するだけであれば、図６
に示すように、図１に示した実施形態１の構成に対し
て、一方の解列開閉器２２ａのみを２個のａ接点を備え
た電磁リレーで構成してもよい。他の構成および動作は
実施形態１と同様である。 （実施形態４）実施形態１では系統連系時と系統分離時
とで電力変換器２３の出力電圧を変化させるものであっ
たが、本実施形態は、系統連系時と系統分離時とで電力
変換器２３の出力電圧を変化させないものである。この
ような構成が採用できるのは、太陽電池２０での発電電
力が共用分岐回路Ｌｃに接続される負荷の消費電力に対
して十分な余裕がある場合であって、電力変換器２３の
ａ線とｂ線、ｂ線とｃ線の間にそれぞれ共用分岐ブレー
カ２４ａ，２４ｂを介して共用分岐回路Ｌｃａ，Ｌｃｂ
を接続している。図７に示すように、本実施形態の構成
では切換開閉器２９ａ，２９ｂが不要であるから接点の
構成は簡単になる。なお、２系統の共用分岐回路Ｌｃ
ａ，Ｌｃｂを有しているから、両共用分岐回路Ｌｃａ，
Ｌｃｂに接続される負荷による電力変換器２３の出力電
圧の変動を抑制するために、各共用分岐回路Ｌｃａ，Ｌ
ｃｂに接続される出力線ごとに個別に電圧制御を行なう
ようにしてある。他の構成および動作は実施形態１と同
様である。If only the guidelines are satisfied, FIG.
As shown in FIG. 1, with respect to the configuration of the first embodiment shown in FIG. 1, only one of the disconnecting switches 22a may be configured by an electromagnetic relay having two a contacts. Other configurations and operations are the same as those of the first embodiment. (Embodiment 4) In Embodiment 1, the output voltage of the power converter 23 is changed between when the system is connected and when the system is separated. However, in the present embodiment, the output voltage is changed between when the system is connected and when the system is separated. The output voltage of the power converter 23 is not changed. Such a configuration can be adopted when the power generated by the solar cell 20 has a sufficient margin with respect to the power consumption of the load connected to the shared branch circuit Lc. And b line, and between b and c lines, shared branch circuits Lca and Lcb via shared branch breakers 24a and 24b, respectively.
Are connected. As shown in FIG. 7, the configuration of the present embodiment does not require the switching switches 29a and 29b, so that the configuration of the contacts is simplified. In addition, two shared branch circuits Lc
a, Lcb, both shared branch circuits Lca, Lca,
In order to suppress the fluctuation of the output voltage of the power converter 23 due to the load connected to Lcb, each of the shared branch circuits Lca, Lca
Voltage control is individually performed for each output line connected to cb. Other configurations and operations are the same as those of the first embodiment.
【００３２】[0032]
【発明の効果】請求項１の発明は、太陽電池と、太陽電
池から出力される直流を交流に変換する電力変換器と、
商用電源に接続された幹線と電力変換器との間に挿入さ
れ系統連系と系統分離との切換を行なう解列開閉器と、
電力変換器と解列開閉器との間の電路から負荷に電力を
供給する共用分岐回路と、異常や商用電源の停電を検出
すると解列開閉器を駆動して系統分離を行なうとともに
電力変換器に通知する系統連系保護装置と、商用電源に
少なくとも主幹ブレーカを介して接続された幹線と、幹
線と解列開閉器との間に挿入された連系ブレーカとを備
え、主幹ブレーカと連系ブレーカとは分電盤に収納さ
れ、解列開閉器は分電盤外に配置されているものであ
り、解列開閉器を分電盤外に設けているから、太陽電池
に近接して配置される電力変換器と解列開閉器との距離
を小さくすることができ、結果的に解列開閉器を駆動す
る系統連系保護装置と電力変換器との距離を小さくする
ことで系統連系保護装置と電力変換器との間の信号線を
短くすることができ、耐ノイズ性が高くなるという利点
がある。According to the first aspect of the present invention, there is provided a solar cell, a power converter for converting DC output from the solar cell into AC,
A disconnection switch inserted between the mains connected to the commercial power supply and the power converter to switch between system interconnection and system isolation;
A shared branch circuit that supplies power to the load from the electric circuit between the power converter and the disconnecting switch, and a power disconnector that drives the disconnecting switch to separate the system when an abnormality or a commercial power failure is detected. A mains connected to the commercial power supply via at least the main breaker, and a mains breaker inserted between the mains and the disconnecting switch. The breaker is housed in the distribution board, and the disconnecting switch is located outside the distribution board.Since the disconnecting switch is provided outside the distribution board, it is placed close to the solar cell. The distance between the power converter and the disconnecting switch can be reduced, and as a result, the distance between the power grid and the grid connection protection device that drives the disconnecting switch can be reduced. The signal line between the protection device and the power converter can be shortened, There is an advantage in that noise resistance is high.
【００３３】請求項２の発明のように、電力変換器が系
統分離時に系統連系時より出力電圧を引上げるように構
成され、電力変換器と共用分岐回路との間には切換開閉
器が設けられ、切換開閉器には、電力変換器の第１の出
力線を系統分離時に共用分岐回路に接続する第１の接点
と、電力変換器の第１の出力線の出力電圧を分圧して出
力する電力変換器の第２の出力線を系統連系時に共用分
岐回路に接続する第２の接点と、第１の接点と第２の接
点とが同時にオンになるのを防止するようにインタロッ
クを行なうインタロック手段とが設けられているもので
は、電力変換器と共用分岐回路との間に挿入した第１の
接点と第２の接点とが同時にオンになることを禁止する
ためにインタロック手段を設けているから、第１の接点
と第２の接点とが同時にオンになるのを確実に防止し、
電力変換器の２本の出力線の短絡を防止することができ
るという利点がある。According to a second aspect of the present invention, the power converter is configured to increase the output voltage from the time of system interconnection when the system is separated, and a switching switch is provided between the power converter and the common branch circuit. The switching switch is provided to divide the output voltage of the first output line of the power converter from the first contact connecting the first output line of the power converter to the shared branch circuit when the system is separated. The second contact connecting the second output line of the output power converter to the shared branch circuit during system interconnection and the first contact and the second contact are prevented from being simultaneously turned on. In the case where an interlock means for performing a lock is provided, an interlock is provided to prevent the first contact and the second contact inserted between the power converter and the common branch circuit from being simultaneously turned on. Since the locking means is provided, the first contact and the second contact are The sometimes become on reliably prevented,
There is an advantage that a short circuit between two output lines of the power converter can be prevented.
【００３４】請求項３の発明のように、系統連系保護装
置が異常ないし停電の解除を検出すると、系統連系運転
に自動的に復帰させるものでは、異常ないし停電によっ
て系統分離されるが、異常ないし停電から復旧すれば自
動的に系統連系運転に復帰するから、復帰操作を行なう
面倒がないという利点がある。請求項４の発明のよう
に、解列開閉器と系統連系保護装置とを収納した連系保
護盤と、電力変換器を収納したボックスとを分電盤とは
別体に設け、共通分岐回路に挿入される共通分岐ブレー
カを連系保護盤内に収納したものでは、解列開閉器と系
統連系保護装置とが連系保護盤に収納され、電力変換器
がボックスに収納されるから、系統連系保護装置と電力
変換器とを比較的近接して配置しながらも、一般に屋外
に設置されることが多いボックスと分離して連系保護盤
を屋内に配置することができ、また共通分岐ブレーカが
連系保護盤内に収納されるから、連系保護盤を屋内に配
置しておけば共通分岐ブレーカが遮断されたときに共通
分岐ブレーカを屋内で操作して復帰させることが可能に
なるという利点がある。According to the third aspect of the present invention, when the system interconnection protection device detects abnormality or cancellation of a power failure, the system is automatically returned to the system interconnection operation. When the system is restored from an abnormality or a power failure, the system automatically returns to the system interconnection operation. Therefore, there is an advantage that there is no trouble in performing the restoration operation. According to a fourth aspect of the present invention, the interconnection protection panel containing the disconnecting switch and the system interconnection protection device and the box containing the power converter are provided separately from the distribution board, and the common branch is provided. In the case where the common branch breaker inserted in the circuit is stored in the interconnection protection panel, the disconnecting switch and the system interconnection protection device are stored in the interconnection protection panel, and the power converter is stored in the box. Although the grid connection protection device and the power converter are arranged relatively close to each other, the grid protection panel can be placed indoors separately from the box that is generally installed outdoors, and Since the common branch breaker is housed in the interconnection protection panel, if the interconnection protection panel is placed indoors, the common branch breaker can be operated indoors and returned when the common branch breaker is cut off There is an advantage of becoming.
【００３５】請求項５の発明のように、解列開閉器と切
換開閉器とをそれぞれ２個ずつの常開接点を備えるリレ
ーを組み合わせて構成したものでは、２個ずつの常開接
点を備えるリレーのみで解列開閉器と切換開閉器とを構
成するから、比較的安価なリレーのみで解列開閉器およ
び切換開閉器を構成することができるとともに、部品品
種を低減することができ、結果的に全体としてのコスト
を低減することが可能になるという利点がある。According to the fifth aspect of the present invention, in the case where the parallel-off switch and the switching switch are each configured by combining a relay having two normally-open contacts, two relays each having two normally-open contacts are provided. Since the disconnecting switch and the switching switch are constituted only by the relays, the disconnecting switch and the switching switch can be constituted only by relatively inexpensive relays, and the number of parts can be reduced. This has the advantage that the overall cost can be reduced.
【００３６】請求項６の発明のように、単相３線式の商
用電源に接続される幹線に解列開閉器を介して接続され
る電力変換器の３本の出力線のうちで幹線の中性線に接
続される出力線と他の２本の出力線とにそれぞれ共用分
岐回路を接続し、電力変換器において各共用分岐回路へ
の印加電圧をそれぞれ個別に制御するものでは、系統連
系時と系統分離時とで電力変換器の出力電圧を変化させ
ておらず、２系統の共用分岐回路の線間電圧を電力変換
器においてそれぞれ個別に制御しているから、切換開閉
器が不要になり接点構成が簡単になり、結果的に接点の
制御が容易になるという利点がある。According to the sixth aspect of the present invention, of the three output lines of the power converter connected to the main line connected to the single-phase three-wire commercial power supply via the disconnecting switch, the main line is connected to the main line. In the case where a common branch circuit is connected to each of the output line connected to the neutral conductor and the other two output lines, and the voltage applied to each common branch circuit is individually controlled in the power converter, a system connection is used. The output voltage of the power converter is not changed between the system and the system separation, and the line voltage of the two shared branch circuits is individually controlled in the power converter. This has the advantage of simplifying the contact configuration and consequently facilitating contact control.
【図１】実施形態１を示す回路図である。FIG. 1 is a circuit diagram showing a first embodiment.
【図２】同上の変形例を示す要部回路図である。FIG. 2 is a main part circuit diagram showing a modification of the above.
【図３】同上の他の変形例を示す要部回路図である。FIG. 3 is a main part circuit diagram showing another modification of the above.
【図４】実施形態２を示す回路図である。FIG. 4 is a circuit diagram showing a second embodiment.
【図５】実施形態３を示す要部回路図である。FIG. 5 is a main part circuit diagram showing a third embodiment.
【図６】応用例を示す要部回路図である。FIG. 6 is a main part circuit diagram showing an application example.
【図７】実施形態４を示す回路図である。FIG. 7 is a circuit diagram showing a fourth embodiment.
【図８】従来例を示す回路図である。FIG. 8 is a circuit diagram showing a conventional example.
２ ボックス ２ａ ボックス ４ 連系保護盤 １２ 主幹ブレーカ ２０ 太陽電池 ２１ 連系ブレーカ ２２ａ，２２ｂ 解列開閉器 ２３ 電力変換器 ２４ 共用分岐ブレーカ ２５ 系統連系保護装置 ２９ａ，２９ｂ 切換開閉器 ＡＣ 商用電源 Ｌｍ 幹線 Ｌｃ 共用分岐回路 2 Box 2a Box 4 Interconnection Protection Panel 12 Main Breaker 20 Solar Battery 21 Interconnection Breaker 22a, 22b Disconnecting Switch 23 Power Converter 24 Shared Branch Breaker 25 System Interconnection Protection Device 29a, 29b Switching Switch AC Commercial Power Lm Trunk line Lc shared branch circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 東浜 弘忠 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 湯浅 裕明 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 大野 宏之 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 岩見 英司 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 臼井 久視 大阪府門真市大字門真1048番地松下電工株 式会社内 (72)発明者 岡本 信一郎 大阪府門真市大字門真1048番地松下電工株 式会社内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hirotada Higashihama 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor Hiroaki Yuasa 1048 Odaka Kazuma Kadoma City, Osaka Pref. (72) Inventor Hiroyuki Ohno 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works, Ltd. (72) Inventor Eiji Iwami 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. Matsushita Electric Works Co., Ltd., 1048 Kadoma, Kadoma, Osaka Prefecture (72) Inventor Shinichiro Okamoto 1048 Kadoma, Kazuma, Kadoma, Osaka Pref.
Claims (6)
流を交流に変換する電力変換器と、商用電源に接続され
た幹線と電力変換器との間に挿入され系統連系と系統分
離との切換を行なう解列開閉器と、電力変換器と解列開
閉器との間の電路から負荷に電力を供給する共用分岐回
路と、異常や商用電源の停電を検出すると解列開閉器を
駆動して系統分離を行なうとともに電力変換器に通知す
る系統連系保護装置と、商用電源に少なくとも主幹ブレ
ーカを介して接続された幹線と、幹線と解列開閉器との
間に挿入された連系ブレーカとを備え、主幹ブレーカと
連系ブレーカとは分電盤に収納され、解列開閉器は分電
盤外に配置されていることを特徴とする太陽光発電シス
テム。1. A solar cell, a power converter for converting a direct current output from the solar cell into an alternating current, and a system interconnection and a system separation inserted between a mains line connected to a commercial power supply and the power converter. Switch that switches the power, a shared branch circuit that supplies power to the load from the power path between the power converter and the disconnector, and drives the disconnector when an abnormality or commercial power failure is detected. System protection device that separates the system and notifies the power converter, a main line connected to the commercial power supply via at least the main breaker, and a grid inserted between the main line and the disconnect switch. A photovoltaic power generation system comprising a breaker, wherein the main breaker and the interconnection breaker are housed in a distribution board, and wherein the disconnecting switch is arranged outside the distribution board.
り出力電圧を引上げるように構成され、電力変換器と共
用分岐回路との間には切換開閉器が設けられ、切換開閉
器には、電力変換器の第１の出力線を系統分離時に共用
分岐回路に接続する第１の接点と、電力変換器の第１の
出力線の出力電圧を分圧して出力する電力変換器の第２
の出力線を系統連系時に共用分岐回路に接続する第２の
接点と、第１の接点と第２の接点とが同時にオンになる
のを防止するようにインタロックを行なうインタロック
手段とが設けられていることを特徴とする請求項１記載
の太陽光発電システム。2. The power converter is configured to raise the output voltage from the time of system interconnection when the power system is separated, and a switching switch is provided between the power converter and the common branch circuit. A first contact for connecting the first output line of the power converter to the shared branch circuit at the time of system separation, and a second contact of the power converter for dividing and outputting the output voltage of the first output line of the power converter. 2
A second contact for connecting the output line to the shared branch circuit at the time of system interconnection, and interlock means for performing interlock so as to prevent the first contact and the second contact from being simultaneously turned on. The photovoltaic power generation system according to claim 1, wherein the photovoltaic power generation system is provided.
除を検出すると、系統連系運転に自動的に復帰させるこ
とを特徴とする請求項１記載の太陽光発電システム。3. The photovoltaic power generation system according to claim 1, wherein when the grid connection protection device detects abnormality or cancellation of the power failure, the system automatically returns to the grid connection operation.
した連系保護盤と、電力変換器を収納したボックスとを
分電盤とは別体に設け、共通分岐回路に挿入される共通
分岐ブレーカを連系保護盤内に収納したことを特徴とす
る請求項１記載の太陽光発電システム。4. An interconnection protection panel containing a disconnecting switch and a system interconnection protection device, and a box containing a power converter are provided separately from a distribution board, and inserted into a common branch circuit. The photovoltaic power generation system according to claim 1, wherein the common branch breaker is housed in an interconnection protection panel.
個ずつの常開接点を備えるリレーを組み合わせて構成し
たことを特徴とする請求項２記載の太陽光発電システ
ム。5. A disconnect switch and a switching switch each having two switches.
The photovoltaic power generation system according to claim 2, wherein the photovoltaic power generation system is configured by combining relays each having a normally open contact.
に解列開閉器を介して接続される電力変換器の３本の出
力線のうちで幹線の中性線に接続される出力線と他の２
本の出力線とにそれぞれ共用分岐回路を接続し、電力変
換器において各共用分岐回路への印加電圧をそれぞれ個
別に制御することを特徴とする請求項１記載の太陽光発
電システム。6. A power line connected to a main line connected to a single-phase three-wire commercial power supply via a disconnecting switch is connected to a neutral line of the main line among three output lines of the power converter. Output line and the other two
The photovoltaic power generation system according to claim 1, wherein a common branch circuit is connected to each of the output lines, and a voltage applied to each common branch circuit is individually controlled in the power converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21885897A JP3354451B2 (en) | 1997-08-13 | 1997-08-13 | Solar power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21885897A JP3354451B2 (en) | 1997-08-13 | 1997-08-13 | Solar power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1169632A true JPH1169632A (en) | 1999-03-09 |
| JP3354451B2 JP3354451B2 (en) | 2002-12-09 |
Family
ID=16726432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21885897A Expired - Fee Related JP3354451B2 (en) | 1997-08-13 | 1997-08-13 | Solar power system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3354451B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITRM20100008A1 (en) * | 2010-01-13 | 2011-07-14 | Solsonica S P A | PHOTOVOLTAIC MODULE WITH FIRE PROTECTION. |
| CN104426233A (en) * | 2013-08-23 | 2015-03-18 | 陕西光伏产业有限公司 | AC-DC dual-power source distribution box |
| JP2021125923A (en) * | 2020-02-03 | 2021-08-30 | 大阪瓦斯株式会社 | System parallel-off device |
| JP2023132299A (en) * | 2022-03-10 | 2023-09-22 | 株式会社力電 | Switching board and switcher |
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|---|---|---|---|---|
| ITRM20100008A1 (en) * | 2010-01-13 | 2011-07-14 | Solsonica S P A | PHOTOVOLTAIC MODULE WITH FIRE PROTECTION. |
| CN104426233A (en) * | 2013-08-23 | 2015-03-18 | 陕西光伏产业有限公司 | AC-DC dual-power source distribution box |
| JP2021125923A (en) * | 2020-02-03 | 2021-08-30 | 大阪瓦斯株式会社 | System parallel-off device |
| JP2023132299A (en) * | 2022-03-10 | 2023-09-22 | 株式会社力電 | Switching board and switcher |
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| Publication number | Publication date |
|---|---|
| JP3354451B2 (en) | 2002-12-09 |
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