JPH09318688A - System connecting system - Google Patents
System connecting systemInfo
- Publication number
- JPH09318688A JPH09318688A JP8135368A JP13536896A JPH09318688A JP H09318688 A JPH09318688 A JP H09318688A JP 8135368 A JP8135368 A JP 8135368A JP 13536896 A JP13536896 A JP 13536896A JP H09318688 A JPH09318688 A JP H09318688A
- Authority
- JP
- Japan
- Prior art keywords
- harmonic component
- interconnection
- failure
- detecting means
- inverter circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、太陽電池などの直
流電源から得られる直流出力を交流出力に変換して商用
電力系統へ逆潮流する系統連系システムに関し、特に系
統連系用リレーの故障の有無を確実に検出するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid interconnection system for converting a DC output obtained from a DC power source such as a solar cell into an AC output for reverse flow to a commercial power system, and more particularly to a failure of a grid interconnection relay. The presence or absence of is surely detected.
【０００２】[0002]
【従来の技術】近年、太陽電池を用いた数ｋＷの比較的
小容量の直流電源を、その出力を交流に変換するインバ
ータ回路を介して商用電力系統に連系し、負荷に電力を
供給する系統連系システムが種々提案されている。図２
は、従来の系統連系システムの概略構成図である。2. Description of the Related Art In recent years, a DC power source having a relatively small capacity of several kW, which uses a solar cell, is connected to a commercial power system via an inverter circuit that converts the output of the solar cell into an AC power source to supply power to a load. Various grid interconnection systems have been proposed. FIG.
FIG. 1 is a schematic configuration diagram of a conventional system interconnection system.
【０００３】図において、２１は直流電源であり、太陽
光のエネルギーを直流電圧に直接変換する太陽電池素子
が多数個直並列に接続された太陽電池、２２はその太陽
電池２１から出力される直流電力を交流に変換するため
のインバータ回路であり、太陽電池２１からの直流出力
は、インバータ回路２２によって交流に変換された上、
絶縁トランス２３、連系用リレー２４やブレーカ２５な
どの開閉手段を経て負荷２６および商用電力系統２７に
供給される。ここで、インバータ回路２２は、インバー
タ制御回路２８によって動作が制御されている。In the figure, reference numeral 21 is a DC power source, a solar cell in which a large number of solar cell elements for directly converting the energy of sunlight into a DC voltage are connected in series and parallel, and 22 is a DC output from the solar cell 21. It is an inverter circuit for converting electric power into alternating current, and the direct current output from the solar cell 21 is converted into alternating current by the inverter circuit 22.
It is supplied to the load 26 and the commercial power system 27 via an opening / closing means such as an insulating transformer 23, an interconnection relay 24 and a breaker 25. Here, the operation of the inverter circuit 22 is controlled by the inverter control circuit 28.
【０００４】そして、上記連系用リレー２４及びブレー
カ２５は、インバータ制御回路２８によって制御されて
いる。従って、負荷２６の短絡や線路断線などによる地
絡発生時、及びインバータ回路２２からの過電流発生時
などの場合には、連系用リレー２４及びブレーカ２５を
開放させて、インバータ回路２２を系統２７から解列す
ると共にインバータ回路２２の動作を停止させる。そし
て、故障個所の復旧後に操作者により手動でブレーカ２
５を投入した後に、インバータ回路２２を再起動させて
いる。The interconnection relay 24 and breaker 25 are controlled by an inverter control circuit 28. Therefore, when a ground fault occurs due to a short circuit of the load 26 or a line break, or when an overcurrent is generated from the inverter circuit 22, the interconnection relay 24 and the breaker 25 are opened to connect the inverter circuit 22 to the system. At the same time as disconnecting from 27, the operation of the inverter circuit 22 is stopped. Then, the operator manually breaks the breaker 2 after the failure point is restored.
After turning on 5, the inverter circuit 22 is restarted.
【０００５】また、夜間など日射量不足により太陽電池
２１による発電電力が連系可能な程度得られない場合に
は、連系用リレー２４のみを開放させて、インバータ回
路２２を系統２７から解列すると共にインバータ回路２
２の動作を停止させる。そして、太陽電池２１から連系
可能な発電電力が得られるようになった場合に、インバ
ータ制御回路２８から連系用リレー２４に連系信号を送
出して、インバータ回路２２を系統２７に連系させると
共にインバータ回路２２を再起動させている。Further, when the generated power from the solar cell 21 cannot be obtained due to insufficient solar radiation such as at night, only the interconnection relay 24 is opened to disconnect the inverter circuit 22 from the system 27. And inverter circuit 2
The operation of 2 is stopped. Then, when the solar cell 21 can generate the generated power that can be interconnected, the inverter control circuit 28 sends an interconnecting signal to the interconnecting relay 24 to connect the inverter circuit 22 to the grid 27. In addition, the inverter circuit 22 is restarted.
【０００６】[0006]
【発明が解決しようとする課題】ところで、上述した従
来システムでは、インバータ制御回路２８からの連系信
号の入力に従い、連系用リレー２４が確実に閉じられて
いるかどうかを確認する方法として、連系用リレー２４
の接点２４ａ、２４ｂの開閉と同期して動作する状態検
出用接点２４ｃを設け、この状態検出用接点２４ｃから
の状態信号によって連系用リレー２４の状態を確認する
方法がある。By the way, in the above-mentioned conventional system, as a method of confirming whether the interconnection relay 24 is surely closed according to the input of the interconnection signal from the inverter control circuit 28, the interconnection system is connected. System relay 24
There is a method of providing a state detection contact 24c that operates in synchronization with the opening and closing of the contacts 24a and 24b, and confirming the state of the interconnection relay 24 by a state signal from the state detection contact 24c.
【０００７】しかしながら、連系用リレー２４の１極の
接点２４ｂのみが摩耗などによる接点不良等の故障によ
り接点が閉じない状態となった場合には、インバータ制
御回路２８からの連系信号の入力に従い、もう１極の接
点２４ａ及び状態検出用接点２４ｃが閉じて連系用リレ
ー２４が正常であると判断され、このような故障は直ぐ
には確認できなかった。However, when only one contact 24b of the interconnection relay 24 is in a state in which the contact cannot be closed due to a failure such as a contact failure due to wear or the like, an interconnection signal is input from the inverter control circuit 28. Accordingly, the contact 24a of the other pole and the contact 24c for state detection were closed, and it was judged that the interconnection relay 24 was normal, and such a failure could not be immediately confirmed.
【０００８】このため、連系用リレー２４の上記故障を
検出することができず、その故障箇所が一向に復旧され
ないために、太陽電池２１から所定出力の発電が可能な
状態であるにも拘わらず、その発電電力が負荷２６及び
系統２７に供給されず、太陽電池の発電電力の有効利用
が図れない虞れがあった。Therefore, the above-mentioned failure of the interconnection relay 24 cannot be detected, and the failure location is not recovered at all, so that the solar cell 21 is in a state in which power generation with a predetermined output is possible. However, the generated power is not supplied to the load 26 and the grid 27, and the generated power of the solar cell may not be effectively used.
【０００９】本発明は、斯かる点に鑑みてなされたもの
であって、連系用リレーの故障の有無を診断して、故障
発生時には即座にインバータ回路の運転を停止させ、故
障個所の復旧を行うことができる系統連系システムを提
供する。The present invention has been made in view of the above point, and diagnoses the presence or absence of a failure of the interconnection relay, immediately stops the operation of the inverter circuit when the failure occurs, and restores the failed portion. To provide a system interconnection system capable of performing.
【００１０】[0010]
【課題を解決するための手段】本発明に係る系統連系シ
ステムは、インバータから出力される交流電力を２次側
に絶縁伝達する絶縁トランスと、該絶縁トランスの２次
側に接続され、前記インバータ回路を商用電力系統に連
系または解列させる連系用リレーと、該連系用リレーと
前記絶縁トランスとの間に設けられ、絶縁トランスの２
次側電圧の高調波成分を検出する第１高調波成分検出手
段と、前記連系用リレーと前記負荷との間に設けられ、
負荷電圧の高調波成分を検出する第２高調波成分検出手
段と、前記インバータ回路の連系運転時に、前記第１高
調波成分検出手段及び第２高調波成分検出手段の検出高
調波成分レベルが一定値以上相違する際には、前記連系
用リレーの故障発生と判断する故障自己診断手段と、該
故障自己診断手段によって故障発生と判断した場合に、
前記インバータ回路の運転を停止させるインバータ制御
手段とを備えている。A system interconnection system according to the present invention is an insulation transformer for insulatingly transmitting AC power output from an inverter to a secondary side, and is connected to the secondary side of the insulation transformer. An interconnecting relay for connecting or disconnecting the inverter circuit to the commercial power system, and an insulating transformer provided between the interconnecting relay and the insulating transformer.
A first harmonic component detecting means for detecting a harmonic component of the secondary voltage; and a relay provided between the interconnection relay and the load,
During the interlocking operation of the second harmonic component detecting means for detecting the harmonic component of the load voltage and the inverter circuit, the detected harmonic component levels of the first harmonic component detecting means and the second harmonic component detecting means are When the difference is equal to or more than a predetermined value, a failure self-diagnosis unit that determines that a failure has occurred in the interconnection relay, and a failure self-diagnosis unit determines that a failure has occurred,
And an inverter control means for stopping the operation of the inverter circuit.
【００１１】この構成を用いることにより、連系運転時
に連系用リレーの故障の有無を診断して、故障発生時に
は即座にインバータ回路の運転を停止させ、故障個所の
復旧を行うことが可能となる。By using this configuration, it is possible to diagnose the presence or absence of a failure of the interconnection relay during interconnection operation, immediately stop the operation of the inverter circuit when a failure occurs, and restore the failed portion. Become.
【００１２】具体的構成としては、前記第１高調波成分
検出手段及び第２高調波成分検出手段は第３次高調波成
分を検出するものであり、前記直流電源は太陽電池であ
る。この構成を用いることにより、連系用リレーの故障
発生時には、第１高調波成分検出手段及び第２高調波成
分検出手段による検出高調波成分の相違が顕著に現れ、
連系用リレーの故障有無を確実に診断することができ
る。また、太陽電池の発電電力の有効利用を図ることが
できる。Specifically, the first harmonic component detecting means and the second harmonic component detecting means detect a third harmonic component, and the DC power source is a solar cell. By using this configuration, when a failure occurs in the interconnection relay, the difference between the detected harmonic components by the first harmonic component detecting means and the second harmonic component detecting means becomes noticeable.
The failure of the interconnection relay can be reliably diagnosed. In addition, it is possible to effectively use the generated power of the solar cell.
【００１３】[0013]
【発明の実施の形態】以下、本発明の系統連系システム
の一実施の形態を示す図面に基づいて詳細に説明する。
図１は本発明を適用させた太陽電池を用いた系統連系シ
ステムの概略構成図である。BEST MODE FOR CARRYING OUT THE INVENTION A detailed description will be given below with reference to the drawings showing an embodiment of a grid interconnection system of the present invention.
FIG. 1 is a schematic configuration diagram of a grid interconnection system using a solar cell to which the present invention is applied.
【００１４】同図において、本発明の系統連系システム
は、太陽光のエネルギーを直流電力に変換する複数個の
太陽電池素子を直並列に接続して構成された直流電源と
しての太陽電池１（本実施形態では、最適動作電圧２０
０Ｖ，最適動作電力３ｋＷ）と、その太陽電池１の直流
電力を交流電力に電力変換して所定交流電圧を供給する
インバータ回路２を中心に構成されており、商用電力系
統３と連系して配電線に接続された各種家電製品などの
負荷４に対して電力を供給している。In the figure, the grid interconnection system of the present invention is a solar cell 1 (a DC power source, which is constituted by connecting a plurality of solar cell elements for converting sunlight energy into DC power in series and in parallel, as a DC power source. In this embodiment, the optimum operating voltage 20
0 V, optimum operating power 3 kW), and the inverter circuit 2 for converting the DC power of the solar cell 1 into AC power and supplying a predetermined AC voltage, and is connected to the commercial power system 3 Electric power is supplied to the load 4 such as various home appliances connected to the distribution line.
【００１５】そして、インバータ回路２の出力側には、
巻線比１：１の絶縁トランス５と、自動復帰型の連系用
リレー６と、手動復帰型のブレーカ７とが順次設けられ
ている。また、太陽電池１とインバータ回路２との間に
は、太陽電池１の出力電圧を検出する太陽電池電圧検出
手段８と、太陽電池１の出力電流を検出する太陽電池電
流検出手段９とが設けられている。On the output side of the inverter circuit 2,
An insulating transformer 5 having a winding ratio of 1: 1, an automatic restoration type interconnection relay 6, and a manual restoration type breaker 7 are sequentially provided. Further, between the solar cell 1 and the inverter circuit 2, a solar cell voltage detecting means 8 for detecting the output voltage of the solar cell 1 and a solar cell current detecting means 9 for detecting the output current of the solar cell 1 are provided. Has been.
【００１６】一方、インバータ回路２の出力側には、そ
の出力電流を検出するインバータ電流検出手段１０と、
系統３との連系点における電圧（負荷電圧）を検出する
連系点電圧検出手段１１とがそれぞれ設けられている。
また、絶縁トランス５と連系用リレー６との間には絶縁
トランス５の２次側電圧の３次高調波成分を検出する第
１高調波成分検出手段１２が、連系用リレー６とブレー
カ７との間には負荷電圧の３次高調波成分を検出する第
２高調波成分検出手段１３がそれぞれ設けられている。On the other hand, on the output side of the inverter circuit 2, an inverter current detecting means 10 for detecting the output current thereof,
An interconnection point voltage detecting means 11 for detecting a voltage (load voltage) at an interconnection point with the system 3 is provided.
Further, between the isolation transformer 5 and the interconnection relay 6, there is provided a first harmonic component detection means 12 for detecting a third harmonic component of the secondary voltage of the isolation transformer 5, and the interconnection relay 6 and the breaker. Second harmonic component detecting means 13 for detecting the third harmonic component of the load voltage is provided between the second and third harmonic components.
【００１７】そして、太陽電池電圧検出手段８で検出さ
れる太陽電池電圧Ｖｎと、太陽電池電流検出手段９で検
出される太陽電池電流Ｉｎと、連系点電圧検出手段１１
で検出される連系点電圧Ｓａと、インバータ電流検出手
段１０で検出されるインバータ出力電流Ｓｂは、マイク
ロコンピュータから構成されるインバータ制御回路（イ
ンバータ制御手段）１４へ供給され、これによって電流
指令値（制御電流値）Ｉｏが作成される。この電流指令
値Ｉｏは、デジタルシグナルプロセッサから構成される
ＰＷＭ制御回路１５へ供給され、これによってインバー
タ回路２を構成する各スイッチング素子に対する駆動信
号が作成される。Then, the solar cell voltage Vn detected by the solar cell voltage detecting means 8, the solar cell current In detected by the solar cell current detecting means 9, and the interconnection point voltage detecting means 11
The interconnection point voltage Sa detected by the inverter and the inverter output current Sb detected by the inverter current detecting means 10 are supplied to an inverter control circuit (inverter control means) 14 composed of a microcomputer, whereby the current command value (Control current value) Io is created. The current command value Io is supplied to the PWM control circuit 15 composed of a digital signal processor, and thereby a drive signal for each switching element forming the inverter circuit 2 is created.
【００１８】具体的には、インバータ制御回路１４は、
太陽電池１の動作点を最大電力の得られる最適動作点に
向けて段階的に変化せしめる最大電力点追尾機能を有し
ている。即ち、インバータ回路２の出力電圧Ｓａ及び出
力電流Ｓｂから出力電力を算出すると共に、動作電圧を
規定するための電圧指令値を微小量だけ増減させて、出
力電力の増減を判定し、出力電力が増加する方向にイン
バータ出力電流の電流指令値（制御電流値）Ｉｏを変化
させて、太陽電池１の動作点を段階的に最適動作点へ近
づけるのである。Specifically, the inverter control circuit 14 is
It has a maximum power point tracking function that gradually changes the operating point of the solar cell 1 toward the optimum operating point where the maximum power can be obtained. That is, the output power is calculated from the output voltage Sa and the output current Sb of the inverter circuit 2, and the voltage command value for defining the operating voltage is increased or decreased by a very small amount to determine whether the output power is increased or decreased. By changing the current command value (control current value) Io of the inverter output current in the increasing direction, the operating point of the solar cell 1 is gradually approached to the optimum operating point.
【００１９】また、インバータ制御回路１４は前述の最
大電力点追尾機能による処理を行う以外に、後述の処理
を行う故障自己診断部１４ａと保護継電処理部１４ｂを
有する。Further, the inverter control circuit 14 has a fault self-diagnosis unit 14a and a protective relay processing unit 14b, which perform the processes described below, in addition to the process by the maximum power point tracking function described above.
【００２０】故障自己診断部１４ａは、第１高調波成分
検出手段１２によって検出される３次高調波成分レベル
Ｖａと、第２高調波成分検出手段１３によって検出され
る３次高調波成分レベルＶｂとが入力されており、イン
バータ回路２の運転時に、その３次高調波成分レベルの
差｜Ｖａ−Ｖｂ｜が一定値以上となる場合に、連系用リ
レー６の故障（開放）発生と判断している。The failure self-diagnosis unit 14a has a third harmonic component level Va detected by the first harmonic component detecting means 12 and a third harmonic component level Vb detected by the second harmonic component detecting means 13. Is input, and when the difference in the third harmonic component level | Va-Vb | becomes a certain value or more during the operation of the inverter circuit 2, it is determined that the interconnection relay 6 has failed (opened). are doing.
【００２１】これは、連系用リレー６が正常である場合
には、３次高調波成分レベルＶａ、Ｖｂは同一となるた
め両者の差は略零となるが、連系用リレー６が開放故障
の場合には、絶縁トランスから発生する３次高調波成分
が第１高調波成分検出手段１２によって検出されるのに
対し、負荷４から発生する３次高調波成分が第２高調波
成分検出手段１３によって検出されることとなり、両者
に差が生じることを利用している。This is because when the interconnection relay 6 is normal, the third harmonic component levels Va and Vb are the same and the difference between the two is substantially zero, but the interconnection relay 6 is opened. In the case of a failure, the third harmonic component generated from the isolation transformer is detected by the first harmonic component detecting means 12, while the third harmonic component generated from the load 4 is detected as the second harmonic component. It is detected by the means 13, and the fact that there is a difference between the two is used.
【００２２】そして、保護継電処理部１４ｂでは、故障
自己診断部１４ａによる診断結果に応じて、連系用リレ
ー６の故障が発生しているときには、即座に連系用リレ
ー６及びブレーカ７へ解列信号を送出して系統３から完
全に解列させると共に、ＰＷＭ制御回路１５に停止信号
を送出してインバータ回路２へ供給すべき駆動信号にゲ
ートブロックを施し、インバータ回路２の動作を停止さ
せる。Then, in the protective relay processing unit 14b, when a failure occurs in the interconnection relay 6 according to the diagnosis result by the failure self-diagnosis unit 14a, the interconnection relay 6 and the breaker 7 are immediately sent. A disconnection signal is sent to completely disconnect from the system 3, and a stop signal is sent to the PWM control circuit 15 to gate block the drive signal to be supplied to the inverter circuit 2 to stop the operation of the inverter circuit 2. Let
【００２３】具体的には、系統中に５％程度含まれる高
調波電圧成分の中から３次高調波電圧成分を抽出し、Ｖ
ａ、Ｖｂの差が顕著に表れた（本実施の形態では０．５
Ｖに設定）の場合に、故障自己診断部１４ａでは連系用
リレー６の開放故障と判断している。Specifically, the third harmonic voltage component is extracted from the harmonic voltage components contained in the system at about 5%, and V
A significant difference between a and Vb appears (0.5 in the present embodiment).
(Set to V), the failure self-diagnosis unit 14a determines that the interconnection relay 6 has an open failure.
【００２４】これにより、インバータ回路２の運転中
に、連系用リレー６の開放故障の有無を診断して、故障
発生時には即座にインバータ回路２の動作を停止させ、
故障個所の復旧を行うことが可能となる。As a result, during the operation of the inverter circuit 2, it is diagnosed whether or not there is an open circuit failure of the interconnection relay 6, and when the failure occurs, the operation of the inverter circuit 2 is immediately stopped.
It is possible to recover the failed part.
【００２５】更に、保護継電処理部１４ｂでは、連系点
電圧Ｓａ及びインバータ出力電流Ｓｂに基づいて、イン
バータ回路２又は系統３の故障状態であるかどうか判断
し、故障状態時には即座に連系用リレー６及びブレーカ
７へ解列信号を送出してインバータ回路２を系統３から
解列させると共に、ＰＷＭ制御回路１５に停止信号を送
出してインバータ回路２の動作を停止させている。ま
た、太陽電池電圧Ｖｎに基づいて、系統３に連系運転で
きない太陽電池１の発電電力不足状態（待機状態）であ
るかどうか判断し、待機状態時には即座に連系用リレー
６へ解列信号を送出してインバータ回路２を系統３から
解列させると共に、ＰＷＭ制御回路１５に停止信号を送
出してインバータ回路２の動作を停止させている。Further, the protective relay processing unit 14b determines whether or not the inverter circuit 2 or the grid 3 is in the fault state based on the interconnection point voltage Sa and the inverter output current Sb, and immediately in the fault state, the grid interconnection is performed. A disconnection signal is sent to the relay 6 and the breaker 7 to disconnect the inverter circuit 2 from the system 3, and a stop signal is sent to the PWM control circuit 15 to stop the operation of the inverter circuit 2. Further, based on the solar cell voltage Vn, it is determined whether or not the generated electric power of the solar cell 1 that cannot be interconnected to the grid 3 is in a shortage state (standby state), and immediately in the standby state, a disconnection signal to the interconnection relay 6 Is sent to disconnect the inverter circuit 2 from the system 3, and a stop signal is sent to the PWM control circuit 15 to stop the operation of the inverter circuit 2.
【００２６】尚、上記実施の形態の説明は、本発明を説
明するものであって、特許請求の範囲に記載の発明を限
定し、或いは範囲を縮減するように解すべきではない。
また、本発明の各構成は上記実施の形態に限らず、特許
請求の範囲に記載の技術的範囲内で種々変形可能であ
る。例えば、上記実施の形態では、インバータ制御回路
１４に、故障自己診断部１４ａと保護継電処理部１４ｂ
を有している場合について説明したが、これらを別個の
構成としても構わない。また、故障自己診断部１４ａに
おいて、３次高調波成分レベルの差｜Ｖａ−Ｖｂ｜が一
定値以上となる場合に、連系用リレー６の故障発生と判
断する場合について説明したが、この他に両者に差が発
生した場合に故障発生と判断しても構わない。It should be noted that the above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope.
Further, each configuration of the present invention is not limited to the above-described embodiment, but can be variously modified within the technical scope described in the claims. For example, in the above embodiment, the inverter control circuit 14 includes a fault self-diagnosis unit 14a and a protection relay processing unit 14b.
Although the case of having the above has been described, these may be configured separately. Further, the case where the failure self-diagnosis unit 14a determines that a failure of the interconnection relay 6 has occurred when the difference | Va-Vb | of the third harmonic component level becomes a certain value or more has been described. If there is a difference between the two, it may be determined that a failure has occurred.
【００２７】[0027]
【発明の効果】以上述べた通り本発明によれば、インバ
ータ回路の連系運転時に連系用リレーの故障の有無を診
断して、故障発生時には即座にインバータ回路の運転を
停止させ、故障個所の復旧を行うことが可能となり、直
流電源の発電電力の有効利用と、システムのメンテナン
ス性の向上を図ることができる。As described above, according to the present invention, the presence or absence of a failure of the interconnection relay is diagnosed during the interconnection operation of the inverter circuit, and when the failure occurs, the operation of the inverter circuit is immediately stopped, and the failure point is detected. This makes it possible to effectively use the generated power of the DC power supply and improve the maintainability of the system.
【図１】本発明の実施の形態による系統連系システムの
概略構成図である。FIG. 1 is a schematic configuration diagram of a grid interconnection system according to an embodiment of the present invention.
【図２】従来の系統連系システムの概略構成図である。FIG. 2 is a schematic configuration diagram of a conventional system interconnection system.
１ 太陽電池 ２ インバータ回路 ３ 商用電力系統 ４ 負荷 ５ 絶縁トランス ６ 連系用リレー ７ ブレーカ ８ 太陽電池電圧検出手段 ９ 太陽電池電流検出手段 １０ インバータ電流検出手段 １１ 連系点電圧検出手段 １２ 第１高調波成分検出手段 １３ 第２高調波成分検出手段 １４ インバータ制御回路（インバータ制御手段） １４ａ 故障自己診断部（故障自己診断手段） １４ｂ 保護継電処理部 １５ ＰＷＭ制御回路 1 solar cell 2 inverter circuit 3 commercial power system 4 load 5 insulation transformer 6 interconnection relay 7 breaker 8 solar cell voltage detection means 9 solar cell current detection means 10 inverter current detection means 11 interconnection point voltage detection means 12 first harmonic Wave component detection means 13 Second harmonic component detection means 14 Inverter control circuit (inverter control means) 14a Fault self-diagnosis unit (fault self-diagnosis means) 14b Protection relay processing unit 15 PWM control circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０２Ｍ 7/48 Ｈ０２Ｎ 6/00 Ｈ０２Ｎ 6/00 Ｈ０２Ｐ 7/63 ３０２Ｄ Ｈ０２Ｐ 7/63 ３０２ Ｈ０１Ｌ 31/04 Ｋ (72)発明者 前川 正弘 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical location H02M 7/48 H02N 6/00 H02N 6/00 H02P 7/63 302D H02P 7/63 302 H01L 31 / 04 K (72) Inventor Masahiro Maekawa 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.
Claims (3)
数の交流電力に変換するインバータ回路を、商用電力系
統に連系して負荷に電力を供給する系統連系システムに
おいて、 前記インバータ回路から出力される交流電力を２次側に
絶縁伝達する絶縁トランスと、 該絶縁トランスの２次側に接続され、前記インバータ回
路を商用電力系統に連系または解列させる連系用リレー
と、 該連系用リレーと前記絶縁トランスとの間に設けられ、
絶縁トランスの２次側電圧の高調波成分を検出する第１
高調波成分検出手段と、 前記連系用リレーと前記負荷との間に設けられ、負荷電
圧の高調波成分を検出する第２高調波成分検出手段と、 前記インバータ回路の連系運転時に、前記第１高調波成
分検出手段及び第２高調波成分検出手段の検出高調波成
分レベルが一定値以上相違する際には、前記連系用リレ
ーの故障発生と判断する故障自己診断手段と、 該故障自己診断手段によって故障発生と判断した場合
に、前記インバータ回路の運転を停止させるインバータ
制御手段とを備えていることを特徴とする系統連系シス
テム。1. In a system interconnection system for converting a DC power generated from a DC power source into an AC power of a system frequency to a commercial power system to supply power to a load, the output from the inverter circuit. An isolation transformer for insulatingly transmitting the AC power to the secondary side, an interconnection relay connected to the secondary side of the isolation transformer for interconnection or disconnection of the inverter circuit to a commercial power system, and the interconnection. Provided between the relay for insulation and the isolation transformer,
First to detect the harmonic component of the secondary voltage of the isolation transformer
Harmonic component detecting means, second harmonic component detecting means provided between the relay for interconnection and the load, for detecting a harmonic component of a load voltage, and during the interconnection operation of the inverter circuit, When the detected harmonic component levels of the first harmonic component detecting means and the second harmonic component detecting means differ by a predetermined value or more, a failure self-diagnosing means for judging a failure of the interconnection relay and the failure. A system interconnection system comprising: an inverter control unit that stops the operation of the inverter circuit when the self-diagnosis unit determines that a failure has occurred.
波成分検出手段は、第３次高調波成分を検出することを
特徴とする請求項１記載の系統連系システム。2. The system interconnection system according to claim 1, wherein the first harmonic component detecting means and the second harmonic component detecting means detect a third harmonic component.
徴とする請求項１または２記載の系統連系システム。3. The grid interconnection system according to claim 1, wherein the DC power source is a solar cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8135368A JPH09318688A (en) | 1996-05-29 | 1996-05-29 | System connecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8135368A JPH09318688A (en) | 1996-05-29 | 1996-05-29 | System connecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09318688A true JPH09318688A (en) | 1997-12-12 |
Family
ID=15150098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8135368A Pending JPH09318688A (en) | 1996-05-29 | 1996-05-29 | System connecting system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09318688A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035655A (en) * | 2006-07-31 | 2008-02-14 | Sanyo Electric Co Ltd | System linkage device |
| JP2008259295A (en) * | 2007-04-04 | 2008-10-23 | Sharp Corp | System-interconnected inverter |
| JP2011135706A (en) * | 2009-12-25 | 2011-07-07 | Hitachi Ltd | Wind power generation system and control method thereof |
| JP2013093949A (en) * | 2011-10-25 | 2013-05-16 | Toshiba Mitsubishi-Electric Industrial System Corp | Power conversion apparatus |
| JP2014049079A (en) * | 2012-09-04 | 2014-03-17 | Nagoya Electrical Educational Foundation | Photovoltaic power generation power conversion system |
| CN103727977A (en) * | 2013-12-20 | 2014-04-16 | 常州大学 | Environment monitor of self-repairing photovoltaic power generation monitoring system and achieving method of environment monitor |
| CN104181474A (en) * | 2014-07-22 | 2014-12-03 | 国家电网公司 | Method for judging fault of photovoltaic grid connection inverter |
| JP2015100249A (en) * | 2013-11-20 | 2015-05-28 | 三菱電機株式会社 | Interconnection inverter device |
| KR20190016512A (en) * | 2016-06-09 | 2019-02-18 | 스미토모덴키고교가부시키가이샤 | Method for determining the operating state of the power conversion apparatus and the blocking unit |
| CN110299726A (en) * | 2019-07-08 | 2019-10-01 | 华北电力大学 | A kind of photovoltaic DC grid-connected system fault recovery control method |
| WO2022085678A1 (en) * | 2020-10-22 | 2022-04-28 | キヤノン株式会社 | Vibration-type drive apparatus and method for driving vibration-type drive apparatus |
-
1996
- 1996-05-29 JP JP8135368A patent/JPH09318688A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008035655A (en) * | 2006-07-31 | 2008-02-14 | Sanyo Electric Co Ltd | System linkage device |
| JP2008259295A (en) * | 2007-04-04 | 2008-10-23 | Sharp Corp | System-interconnected inverter |
| JP2011135706A (en) * | 2009-12-25 | 2011-07-07 | Hitachi Ltd | Wind power generation system and control method thereof |
| JP2013093949A (en) * | 2011-10-25 | 2013-05-16 | Toshiba Mitsubishi-Electric Industrial System Corp | Power conversion apparatus |
| JP2014049079A (en) * | 2012-09-04 | 2014-03-17 | Nagoya Electrical Educational Foundation | Photovoltaic power generation power conversion system |
| JP2015100249A (en) * | 2013-11-20 | 2015-05-28 | 三菱電機株式会社 | Interconnection inverter device |
| CN103727977A (en) * | 2013-12-20 | 2014-04-16 | 常州大学 | Environment monitor of self-repairing photovoltaic power generation monitoring system and achieving method of environment monitor |
| CN104181474A (en) * | 2014-07-22 | 2014-12-03 | 国家电网公司 | Method for judging fault of photovoltaic grid connection inverter |
| KR20190016512A (en) * | 2016-06-09 | 2019-02-18 | 스미토모덴키고교가부시키가이샤 | Method for determining the operating state of the power conversion apparatus and the blocking unit |
| CN109429542A (en) * | 2016-06-09 | 2019-03-05 | 住友电气工业株式会社 | The method of the mode of operation of power conversion device and determining tripper |
| EP3471259A4 (en) * | 2016-06-09 | 2020-03-04 | Sumitomo Electric Industries, Ltd. | Power conversion device and method for determining operational state of cutoff unit |
| CN109429542B (en) * | 2016-06-09 | 2020-11-03 | 住友电气工业株式会社 | Power conversion device and method for determining operating state of circuit breaking device |
| TWI730068B (en) * | 2016-06-09 | 2021-06-11 | 日商住友電氣工業股份有限公司 | Power conversion device and method for judging operation state of circuit breaker |
| AU2017278524B2 (en) * | 2016-06-09 | 2021-07-29 | Sumitomo Electric Industries, Ltd. | Power conversion device and a method for determining operational state of breaking device |
| CN110299726A (en) * | 2019-07-08 | 2019-10-01 | 华北电力大学 | A kind of photovoltaic DC grid-connected system fault recovery control method |
| WO2022085678A1 (en) * | 2020-10-22 | 2022-04-28 | キヤノン株式会社 | Vibration-type drive apparatus and method for driving vibration-type drive apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109375099B (en) | Fault detection method for grid-connected relay of photovoltaic inverter | |
| JPH09318688A (en) | System connecting system | |
| JPH089648A (en) | Operation control method for dispersed power source | |
| JP3428005B2 (en) | Operation control method of distributed interconnection system | |
| JPH09322555A (en) | System cooperation system | |
| JPH09285015A (en) | Dc ground detector of photovoltaic power generation system | |
| JP3319264B2 (en) | Solar power system | |
| JPH09117066A (en) | System interconnection power supply system | |
| JPH06133462A (en) | System interconnection system | |
| JPH08149843A (en) | Protector of system interconnection inveter | |
| JP3407974B2 (en) | Grid connection system | |
| JP3192918B2 (en) | Grid-connected power supply | |
| JPH08275397A (en) | System-interconnected system | |
| JP2951141B2 (en) | Method of improving unbalance in single-phase three-wire line and power supply device used therefor | |
| JPH1051959A (en) | Decentralized power system | |
| JP3584613B2 (en) | Distributed power system | |
| JP2001016782A (en) | System interconnecting inverter device | |
| JPH09149554A (en) | Solar-ray power generator | |
| JPH08130883A (en) | System interconnection system | |
| CN210092959U (en) | On-line AC uninterrupted power supply system | |
| CN216649307U (en) | Intelligent power supply circuit | |
| CN112838615B (en) | Control system for generator set splitting | |
| WO2022222009A1 (en) | Direct current junction box, photovoltaic power generation system, and fault detection method | |
| JP2503399B2 (en) | Interconnection device with distribution system | |
| CN117970008A (en) | Tripping and closing loop monitoring system and method for relay protection device |