JP2005033851A

JP2005033851A - Supervisory controller of distribution system and its program

Info

Publication number: JP2005033851A
Application number: JP2003192771A
Authority: JP
Inventors: Yasuo Okuda; 靖男奥田; Kenichi Tanomura; 顕一田能村
Original assignee: Toshiba Corp; TMT & D KK
Current assignee: Toshiba Corp; TMT & D KK
Priority date: 2003-07-07
Filing date: 2003-07-07
Publication date: 2005-02-03
Anticipated expiration: 2023-07-07
Also published as: JP4094502B2

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of an electric shock accident due to single operation by detecting whether a distributed power supply is under single operation or not upon occurrence of an accident on a distribution line. <P>SOLUTION: The supervisory controller of distribution system performs remote on/off control of a plurality of switches provided in a distribution system being linked with a distributed power supply through a slave station unit. The supervisory controller comprises a means 25 for supervising the state of the distribution system, an apparatus status file 28 containing polling results of each slave station unit, a system connection file 43 storing the presence information of a distributed power supply being connected with a distribution line and the connection information of a distribution facility, and a means 41 being actuated by the system state supervising means upon occurrence of an accident on the distribution line to make a decision whether a distributed power supply is under single operation or not upon occurrence of an accident on the distribution line using the data in the apparatus status file and the system connection file. Furthermore, a means 42 for delivering an alarm when a decision is made that a distributed power supply is under single operation is also provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、配電系統に分散電源が連係された系統において、事故時に分散電源状態を把握する配電系統監視制御装置およびそのプログラムに関する。
【０００２】
【従来の技術】
近年、太陽光発電や風力発電、燃料電池、マイクロガスタービン等の小容量電源が比較的大きな電力を消費する需要家に設置され、この小容量電源が配電系統に連係されるようになってきた。配電系統は配電系統監視制御装置によって監視制御されるが、分散設置されている小容量電源（以下、分散電源という）の監視までは行っていないのが通常である。
【０００３】
この理由は、従来の配電系統監視制御装置は配電系統に設置された開閉器から得られた情報により事故時の早期停電復旧や系統工事に伴う系統切替のために設計されてはいるが、分散電源との連係を考慮していないからである。
【０００４】
以下、従来の技術について図を参照して説明する。図１３は分散電源を連係していない一般的な配電系統図であり、図１４はこの配電系統を監視制御する配電系統監視制御装置の構成図である。
【０００５】
図１３において、配電変電所１内に設けられた変電所母線（三相母線）４は、配電用変圧器２、受電用遮断器３を介して上位系統に連係されている。５ａ〜５ｃは変電所母線４と配電線６ａ〜６ｃとを接続する配電線遮断器である。これらの配電線６ａ〜６ｃは樹枝状の配電網を構築するためにそれぞれ区分開閉器７ａ−１、７ａ−２、７ａ−３、７ｂ−１、７ｂ−２、７ｃ−１〜７ｃ−２により適宜の配電区間毎に区分されるとともに、連係点開閉器（ループ点開閉器とも呼ぶ）８ａ、８ｂ、８ｃによって相互に連係されている。
【０００６】
一方、１４は複数の配電用変電所１に繋がる配電線６ａ〜６ｃを統括して監視制御する配電系統監視制御装置（詳細を図１４で示す）であり、通信線１３−１を介して各配電変電所１に設置されている遠方監視制御装置２１に接続されている。なお、図１３の例では図面の煩雑化を避けるために、配電変電所１は１つしか示していないが、実際には配電系統監視制御装置１４によって複数の配電用変電所毎に接続される配電系統機器を制御するようになっている。
【０００７】
前記遠方監視制御装置２１は、別の通信線１３−２を介して前記各開閉器７ａ−１、７ａ−２、〜８ｃ毎に設けた子局装置９ａ−１，９ａ−２，９ａ−３、９ａ−４、９ｂ−１，９ｂ−２，９ｃ−１，９ｃ−２、９ｃ−３、９ｃ−４にそれぞれ接続されている。
【０００８】
図１４は、配電系統監視制御装置１４の概念構成を示す図である。配電系統監視制御装置１４は監視制御用計算機１７と、表示操作装置２２とから構成され、さらに監視制御用計算機１７は系統状態監視手段２５および機器ステータスファイル２８を備えた記憶装置２７とから構成されている。
【０００９】
図１５は前記機器ステータスファイル２８のファイル構成を示す図であり、機器すなわち開閉器ＳＷ１，ＳＷ２，・・・ＳＷ８毎に、それぞれ現在の入切状態および標準入切状態を登録してある。
【００１０】
図１６は、前記開閉器および子局装置の接続関係を示す構成図であり、ここでは開閉器７ａ−１を例にして示している。子局装置９ａ−１は電源側トランスＴＲ１または負荷側トランスＴＲ２によって駆動電源を供給されるように構成されている。しかもこの子局装置９ａ−１は通信線１３−２によって遠方監視制御装置２１との間で状態情報、制御指令を送受信するように構成されている。
【００１１】
次に、以上述べた図１３ないし図１６を参照して、配電系統の運用について説明する。前記区分開閉器７ａ−１、７ａ−２、７ａ−３、７ｂ−１、７ｂ−２、７ｃ−１および７ｃ−２は常時閉状態で運用され、配電線相互間を連係する開閉器８ａ、８ｂおよび８ｃは常時開状態で運用されているが、配電系統に事故が発生した場合には供給支障の局所化すなわち停電区間を極力小さい範囲に絞り込むために、常開点および常閉点を変更するようにしている。
【００１２】
この各開閉器の入・切制御は配電系統監視制御装置１４から遠方監視制御装置２１を経て子局装置９ａ−１、９ａ−２、９ａ−３、９ａ−４、９ｂ−１、９ｂ−２、９ｃ−１、９ｃ−２、９ｃ−３、９ｃ−４に送られてくる制御信号によって行われる。
【００１３】
なお、常閉の区分開閉器に設けられている子局装置９ａ−１、９ａ−２、９ｂ−１、９ｂ−２、９ｃ−１、９ｃ−２は遠隔制御のためのデータ送受信機能以外に、トランスによって配電線の充電状態が検出されると、一定の検出時間（ＴＸ時限）後に投入する機能と、投入後一定の確認時間（ＴＹ時限）以内に再度停電になると自動投入をロックする機能とを備えており、この機能により配電系統に事故が発生した際に、事故発生区間が特定できるようになっている。
【００１４】
遠方監視制御装置２１と子局装置間とはポーリング方式で通信が行われており、遠方監視制御装置２１は同一通信線内の子局装置を順次ポーリングで状態問合せを行い、状態に変化があれば、前記配電系統監視制御装置１４内の監視制御用計算機１７にその状態が送信されるように構成されている。
【００１５】
通常、子局装置は図１６のように配電系統から駆動電源を確保するように接続されているため、配電系統に停電が発生すると子局装置の駆動電源は消失する。このため遠方監視制御装置２１と当該停電中の配電系統の子局装置との間で通信ができなくなる（この状態を子局装置の無応答状態という）。このとき、遠方監視制御装置２１は子局装置が無応答状態にあるとして監視制御用計算機１７に通知する。
【００１６】
遠方監視制御装置２１を介して監視制御用計算機１７に収集された系統情報データは、系統状態監視手段２５によって記憶装置２７内の機器ステータスファイル２８に格納される。
【００１７】
ここで、配電線６ａに事故が発生した場合、配電線遮断器５ａが遮断され配電線６ａに設けられている常閉開閉器（ＳＷ１）７ａ−１、（ＳＷ２）７ａ−２、（ＳＷ３）７ａ−３は閉状態から無電圧開放状態となり、この停電により駆動電源を失った子局装置は無応答状態となる。配電系統監視制御装置１４は、遠方監視制御装置２１を介してこれら配電用遮断器５ａや開閉器の子局装置状態等の系統情報データを取り込み監視し、停電状態と認識する。
【００１８】
このように、従来の配電系統監視制御装置は配電系統に分散電源が連係されることを考慮せずに処理していた。例えば、下記の特許文献１（特開平１０−２４８１６８号公報）の場合、配電系統に分散電源が接続されている状態で配電線事故が発生した場合、分散電源を所有する需要家がその分散電源を電力系統から解列することを基本原則とし、配電系統監視制御装置側ではこの分散電源の解列が行われているか否かを認識するようには構成されていない。
【００１９】
【特許文献１】
特開平１０−２４８１６８号公報（第２−３頁、図１）
【００２０】
【発明が解決しようとする課題】
もし、この状態で電力会社の作業員が作業を行うと、分散電源から配電系統への逆潮流が生ずる場合には、感電する恐れがある。
本発明の目的は、以上の点に鑑みてなされたもので、配電線事故が発生したとき、分散電源が単独運転中であるか否かを検出し、単独運転による感電事故等の発生を未然に防止することのできる配電系統監視制御装置およびそのプログラムを得ることにある。
【００２１】
【課題を解決するための手段】
上記の目的を達成するために、請求項１に係る配電系統監視制御装置の発明は、分散電源が連係される配電系統に設けられた複数の開閉器の入り切り制御を子局装置を介して遠隔制御するようにした配電系統監視制御装置において、遠方監視制御装置を介して収集した系統情報データを入力して状態監視を行う系統状態監視手段と、この系統状態監視手段を通して得られた系統情報データを収納する機器ステータスファイルと、配電線に接続される分散電源の有無情報および配電設備の接続情報を格納した系統接続ファイルと、配電線事故時に前記系統状態監視手段によって起動され前記機器ステータスファイルおよび系統接続ファイルのデータを用いて分散電源が配電線事故時に単独運転しているか否かを判断する単独運転判断手段と、この単独運転判断手段が分散電源の単独運転中であると判定した場合、警報を出力する警報出力手段とを備えたことを特徴とする。
【００２２】
また、請求項８に係る配電系統監視制御装置の監視制御用計算機で実行されるプログラムは、分散電源が連係される配電系統に設けられた複数の開閉器の入り切り制御を子局装置を介して遠隔制御する配電系統監視制御装置の監視制御用計算機で実行されるプログラムであって、遠方監視制御装置を介して収集した系統情報データを系統状態監視手段に入力させ、この系統状態監視手段を通して得られた系統情報データを機器ステータスファイルに収納させ、配電線に接続される分散電源の有無情報および配電設備の接続情報を系統接続ファイルに格納させ、配電線事故時に前記機器ステータスファイルおよび系統接続ファイルのデータを用いて分散電源が配電線事故時に単独運転しているか否かを判断させ、分散電源の単独運転中であると判定した場合、警報出力手段から警報を出力させる配電系統監視制御装置の監視制御用計算機で実行されることを特徴とする。
【００２３】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態について説明する。なお、各図を通して同等の構成要素には同一の符号を付けて重複した説明は省略する。
【００２４】
（第１の実施の形態）
図１は分散電源を連係した配電系統図を示す。図１の配電系統図が前述の図１３と異なる点は、開閉器８ｆを介して配電線６ａに分散電源１５−１および負荷１６−１を接続し、また開閉器８ｇを介して配電線６ｃに分散電源１５−２および負荷１６−２を接続するように構成していることである。
【００２５】
図２は第１の実施の形態に係る配電系統監視制御装置１４のうち監視制御計算機１７の機能を主に示すブロック図であり、前述した図１４の従来装置に対して、単独運転判断手段４１、警報出力手段４２および記憶装置２７内に系統接続ファイル４３を追加した構成となっている。
【００２６】
図３は前記系統接続ファイル４３のファイル構成図であり、このうち図３（ａ）に配電線６ａ、６ｂ、６ｃ毎に分散電源の有り・無しの分散電源有無情報が登録されている。そして図３（ｂ）に配電設備（開閉器、分散電源等）の電源側接続機器（接続１）、負荷側接続機器（接続２）、連係点接続機器（接続３）を登録して系統接続ファイルを構成している。図４は分散電源の単独運転判断手段４１の処理フロー図である。
【００２７】
次に、以上の図面を用いて本実施の形態の作用について説明する。
前述したように、各開閉器は事故による電力供給支障の局所化を図るために、配電線遮断器のトリップにより配電線が無電圧状態（停電）になると、一斉に無電圧開放する。一方、子局装置は駆動電圧を配電線から取っているため、配電線が無電圧状態なると遠方監視制御装置に対して無応答状態になる。
【００２８】
本発明による配電系統監視制御装置１４はこの機能に着目して分散電源が単独運転状態になっているか否かを判断するものである。すなわち、配電線遮断器がトリップしたとき、本来無応答状態になるべき子局装置から応答の返送があり、かつ配電線に電圧有りの状態が判断された場合、配電系統の事故発生後も、分散電源１５−１と負荷１６−１（または分散電源１５−２と負荷１６−２）とのバランスがとれた状態になって分散電源１５−１（または１５−２）側に設置されている単独運転検出装置が正常に動作せず、分散電源１５−１（１５−２）が単独運転状態になっているということを配電系統監視制御装置１４が判断する。
【００２９】
図１において、例えば、配電線６ａの開閉器７ａ−２および７ａ−３間の配電区間に事故が発生し、配電線遮断器５ａが遮断されたとする。すると、図２において、開閉器系統状態監視手段２５は遠方監視制御装置２１を介して得た情報に基づいて事故の発生を検出し、単独運転判断手段４１を起動する。
【００３０】
図４のフロー処理図において、単独運転判断手段４１は系統接続ファイル４３から系統情報データを取り出し配電線６ａに分散電源１５−１が接続されているか否かをチェックする（Ｓ１０１）。この場合配電線６ａに分散電源が接続されているので、系統接続ファイル４３から当該配電線６ａに接続されている子局装置９ａ−１、９ａ−２、９ａ−３および９ａ−４を取り出し、その個数分処理する（Ｓ１０２）。
【００３１】
単独運転判断手段４１は子局装置９ａ−１、９ａ−２、９ａ−３および９ａ−４のポーリング結果に基づいたデータを格納している機器ステータスファイル２８から当該開閉器７ａ−１、７ａ−２、７ａ−３および７ａ−４の状態を取り出す（Ｓ１０３）。当該開閉器が常閉の開閉器で、子局装置から応答有りの状態で、なおかつ電圧有り状態であれば、配電線６ａに単独運転中の分散電源有りと判断する（Ｓ１０４）。
【００３２】
配電線６ａに接続されている開閉器に対応する子局装置それぞれについて、ポーリングし、常閉開閉器かつ応答有り・電圧有りをチェックする。
この場合、開閉器７ａ−１、７ａ−２は無電圧開放しているので子局装置９ａ−１、９ａ−２からの応答はない。しかし、開閉器８ｆが開放せず、分散電源１５−１が配電線６ａに接続されている状態の場合、子局装置９ａ−３は分散電源から駆動電源の供給を受けているので、子局装置９ａ−３のポーリング結果は、応答有りでかつ電圧有りの状態となる。
【００３３】
この結果、単独運転判断手段４１は配電線６ａに単独運転中の分散電源有りと判断し、警報出力手段４２を起動する（Ｓ１０５）。警報出力手段４２は、外部の警報装置を鳴動させるとともに、表示操作装置２２に注意喚起のメッセージを表示し、聴覚および視覚の両方からオペレータに注意を喚起する。
【００３４】
以上述べたように本実施の形態によれば、配電系統の機器構成そのままで、分散電源が系統連係されて、事故時に単独運転が継続していてもその監視を行うことができる。また、作業員に注意を喚起することで、感電事故を防止することができる。
【００３５】
（第２の実施の形態）
次に、図５および図６を参照して本発明の第２の実施の形態を説明する。
図５は本発明の第２の実施の形態に係る配電系統監視制御装置のうち監視制御計算機１７の機能を主に示すブロック図であり、図６は開閉器開放手段の処理フロー図である。図５において、４５は前記第１の実施の形態で述べた単独運転判断手段４１が単独運転中の分散電源有りと判断した場合に起動される開閉器開放手段である。この開閉器開放手段４５が起動すると機器ステータスファイル２８、機器接続ファイル４３から分散電源に接続される開閉器データを取り出して該当する開放器に開放指令を出力する。
【００３６】
次に、本実施の形態の作用について説明する。
配電系統に事故が発生すると、図５の系統状態監視手段２５によって単独運転判断手段４１が起動される。そしてこの単独運転判断手段４１が単独運転中の分散電源有りと判断すると、前記警報出力手段４２を起動するとともに、開閉器開放手段４５を起動する。
【００３７】
図６の処理フロー図において、開閉器開放手段４５は、まず系統接続ファイル４３から分散電源に接続される子局装置を取り出す（Ｓ１１１）。接続された開閉器が複数あれば、順に開閉器状態を調べる（Ｓ１１２）。取り出された開閉器の状態が入状態でかつ応答有りかつ電圧有り状態であれば（Ｓ１１３）、当該子局装置に対して、開放信号を出力する（Ｓ１１４）。
【００３８】
本実施の形態では、負荷バランスがとれて分散電源が持つ単独運転検出装置が動作していなかった場合、分散電源が単独運転中の配電線の一部を配電系統から切り離して負荷バランスを崩すことにより、分散電源自身で系統から切り離すように動作させる。
【００３９】
以上述べたように本実施の形態によれば、単独運転中の分散電源があれば、その単独運転中の分散電源を系統から解列するために分散電源近傍の開閉器を開放する開閉器開放手段を備えるようにしたので、分散電源が単独運転中となった場合でも最少の操作にて分散電源を配電系統から解列することが可能となり、健全な停電状態により作業員が作業に着手することが可能となる。
【００４０】
（第３の実施の形態）
図７および図８を参照して発明の第３の実施の形態を説明する。
図７は本発明の第３の実施の形態に係る配電系統監視制御装置１４のうち監視制御計算機２３の機能を主に示すブロック図であり、図８は開閉器前開放手段の処理フロー図である。
【００４１】
図７において、４６は本実施の形態で新たに設けた開閉器全開放手段であり、前記開閉器開放手段４５から分散電源の近くの開閉器に開放制御指令を出力したにも拘らず分散電源の単独運転が解消されない場合、単独運転判断手段４１により起動される。
【００４２】
次に、本実施の形態の作用を説明する。
図７において、配電系統に事故が発生し、系統状態監視手段２５によって単独運転判断手段４１が起動される。この単独運転判断手段４１は単独運転中の分散電源有りと判断すると、前記警報出力手段４２および開閉器開放手段４５を起動する。そして開閉器開放手段４５の動作によっても、分散電源の単独運転が解消されない場合、単独運転判断手段４１は開閉器全開放手段４６を起動する。
【００４３】
図８の開閉器全開放手段の処理フロー図において、開閉器全開放手段４６は起動すると系統接続ファイル４３から事故の発生した配電線に接続されている全開閉器を取り出し、その個数分処理する（Ｓ１２１）。当該開閉器のポーリング結果が格納されている機器ステータスファイルから開閉器の状態情報を取り出し（Ｓ１２２）、開閉器が常閉で、しかも該子局装置の応答有りかつ電圧有り状態であれば、当該当子局装置に対し開閉器開放信号を出力する（Ｓ１２３）。これを該配電線に接続されている全開閉器に対して実施する。
【００４４】
以上述べたように本実施の形態によれば、負荷バランスを崩す目的で分散電源の近くの開閉器開放を実施したにも拘らず分散電源の単独運転が解消されない場合、応答のある開閉器を全て開放する開閉器全開放手段を備えたので、分散電源が単独運転中となった場合でも確実に分散電源を配電系統から解列することが可能となり、健全な停電状態により作業員が作業に着手することが可能となる。
【００４５】
（第４の実施の形態）
次に図９を参照して発明の第４の実施の形態を説明する。
図９は本発明の第４の実施の形態に係る配電系統監視制御装置１４のうち主に監視制御計算機２３の機能を示すブロック図であり、図１０は開放開閉器データファイルの構成図である。図９において、５１はデータ設定手段、５２は特定開閉器制御手段、５３は開放開閉器データファイルである。オペレータは分散電源が単独運転中となった場合に開放するのが最適と判断した開閉器に関するデータをあらかじめ表示操作装置２２からデータ設定手段５１に入力し、このデータ設定手段５１から開放開閉器データファイル５３に格納しておく。
【００４６】
図１０は開放開閉器５３のデータファイル構成図である。この例では、配電線６ａに事故が発生した場合開閉器ＳＷ３が、配電線６ｃに事故が発生した場合開閉器ＳＷ７がそれぞれ開放すべき開閉器としてオペレータによって登録されている。なお、配電線６ｂには分散電源が接続されていないので、オペレータが登録すべき開閉器は存在しない。
【００４７】
次に、本実施の形態の作用について説明する。
図９において、配電系統に事故が発生し、系統状態監視手段２５によって単独運転判断手段４１が起動され、この単独運転判断手段４１が単独運転中の分散電源有りと判断すると、警報出力手段４２を起動するとともに、特定開閉器制御手段５２を起動する。
【００４８】
この特定開閉器制御手段５２は、あらかじめオペレータによって開放開閉器データファイル５３に格納しておいた操作すべきものと判断された開閉器に関するデータを取り出して、開放制御を実施する。本例の場合、配電線６ａに故障が発生した場合、分散電源から電源側をみて一番近い開閉器ＳＷ３が開放制御される。配電系統がもっと複雑で、分散電源に接続される開閉器が複数ある場合は、開閉器データファイル５３には複数登録可能となっている。特定開閉器制御手段５２は、開閉器データファイル５３に登録されている開閉器を全て開放制御する。
【００４９】
以上述べたように本実施の形態によれば、配電線事故時に分散電源の単独運転が検出された場合に開放すべき開閉器をあらかじめデータ設定手段より設定しておき、実際に配電線に事故が発生したときに分散電源の単独運転が検出された場合、当該開閉器を開放制御するようにしたもので、分散電源が単独運転中となった場合でもオペレータが最適と判断した開閉器を全て開放制御することができ、分散電源を配電系統から確実に解列することが可能となり、健全な停電状態により作業員が作業に着手することが可能となる。
【００５０】
（第５の実施の形態）
図１１および図１２を参照して発明の第５の実施の形態を説明する。
図１１は本発明の第５の実施の形態に係る配電系統監視制御装置１４のうち主に監視制御計算機２３の機能を示すブロック図、図１２は図１１に設けられた各種データファイルのファイル構成図である。
【００５１】
図１１において、６１は潮流計算手段であり、６２はこの潮流計算手段によって計算された事故前の潮流を保存する事故前潮流保存手段である。６３は潮流変化箇所検出手段、６４は分散電源解列制御手段、６５は現在系統潮流データファイル、６６は事故前系統潮流データファイル、６７は電圧電流データファイル、６８は分散電源出力情報ファイルである。
【００５２】
図１２（ａ）、（ｂ）、（ｃ）および（ｄ）は、それぞれ現在系統潮流データファイル６５，事故前系統潮流データファイル６６，電圧電流データファイル６７、分散電源出力情報ファイル６８のファイル構成図である。
【００５３】
図１１において、潮流計算手段６１は定期的に現在の電圧電流データファイル６７、計算機内部に保有している配電系統設備情報（配電系統監視装置自体が本来の機能を果たすために保有している情報）および分散電源出力情報ファイル６８に格納されている分散電源の出力情報を用いて現在の配電系統の潮流計算を行い、その計算結果を現在系統潮流データファイル６５に格納する。なお、潮流計算は、配電系統から取り込んだ電圧，電流，位相角をもとに有効電力と無効電力を求めることにより実施するが、計算方法は周知であるため説明を省略する。
【００５４】
また、事故が発生すると系統状態監視手段２５は単独運転判断手段４１を起動するとともに事故前潮流保存手段６２を起動する。これにより起動した事故前潮流保存手段６２は現在系統潮流データファイル６５に格納されている内容を事故前系統潮流データファイル６６にコピーする。
【００５５】
また、単独運転判断手段４１は単独運転中の分散電源有りと判断すると、警報出力手段４２を起動するとともに、潮流変化箇所検出手段６３を起動する。この潮流変化箇所検出手段６３は事故が発生した配電線の事故前系統潮流を事故前系統潮流データファイル６６から取り出し、また現在系統潮流データファイル６５に格納されている現在潮流を取り出し、両者を比較することによって分散電源に近い開閉器のうち、事故の発生前後で潮流方向が変化している箇所を見つけて、その開閉器を分散電源解列制御手段６４へ通知する。
【００５６】
分散電源解列制御手段６４は、当該開閉器に開放信号を出力する。潮流方向が変化している箇所は分散電源の単独運転によって負荷バランスがとれている箇所であり、その箇所の開閉器を系統から切り離すことで、分散電源の単独運転による負荷バランスを崩すことが可能となり、分散電源自身が自発的に系統から切り離すことが可能となる。
【００５７】
以上述べたように本実施の形態によれば、定期的に計算した配電系統潮流状態を保存しておき、事故前の潮流状態と分散電源が単独運転となってからの潮流状態とから潮流方向の変化箇所を検出し、その変化箇所である開閉器を開放制御することによって分散電源を配電系統から解列することが可能となり、健全な停電状態により作業員が作業に着手することが可能となる。
【００５８】
なお、第２の実施の形態、あるいは第４の実施の形態を実施しても、単独運転が継続していると判断した場合（無応答状態に遷移しない子局装置が存在する場合）、その後備保護として第３の実施の形態あるいは第５の実施の形態を組合せて実施するようにしてもよい。このようにするとより確実に単独運転中の分散電源を配電系統から切り離すことが可能となる。
【図面の簡単な説明】
【図１】分散電源が連係された配電系統の図。
【図２】本発明の第１の実施の形態に係る配電系統監視制御装置の主に監視制御用計算機の機能を示すブロック図。
【図３】系統接続ファイルの構成図。
【図４】単独運転判断手段の処理フロー図。
【図５】本発明の第２の実施の形態に係る配電系統監視制御装置の主に監視制御用計算機の機能を示すブロック図。
【図６】開閉器開放手段の処理フロー図。
【図７】本発明の第３の実施の形態に係る配電系統監視制御装置の主に監視制御用計算機の機能を示すブロック図。
【図８】開閉器全開放手段の処理フロー図。
【図９】本発明の第４の実施の形態に係る配電系統監視制御装置の主に監視制御用計算機の機能を示すブロック図。
【図１０】開放開閉器データファイルの構成図。
【図１１】本発明の第５の実施の形態に係る配電系統監視制御装置の主に監視制御用計算機の機能を示すブロック図。
【図１２】現在系統潮流データファイル、事故前系統潮流データファイル、電圧電流データファイル、分散電源出力情報ファイルのファイル構成図。
【図１３】簡単な配電系統の図。
【図１４】従来の配電系統監視制御装置の構成図。
【図１５】機器ステータスファイルの構成図。
【図１６】配電系統上に設置されている開閉器と事故区間を検出除去する機能を備えた子局装置の構成図。
【符号の説明】
１…配電変電所、２…配電用変圧器、３…遮断器、４…三相母線、５ａ〜５ｃ…遮断器、６ａ〜６ｃ…配電線、７ａ〜７ｃ…開閉器、８ａ〜８ｃ、８ｆ…開閉器９ａ，９ｂ…子局装置、１３…通信線、１４…配電系統監視制御装置、１５…分散電源、１６…負荷、１７…監視制御用計算機、２１…遠方監視制御装置、２２…表示操作装置、２５…系統状態監視手段、２７…記憶装置、２８…機器ステータスファイル、４１…単独運転判断手段、４２…警報出力手段、４３…系統接続ファイル、４５…開閉器開放手段、４６…開閉器全開放手段、５１…データ設定手段５２…特定開閉器制御手段、５３…開放開閉器データファイル、６１…潮流計算手段、６２…事故前潮流保存手段、６３…潮流変化箇所検出手段、６４…分散電源解列制御手段、６５…現在系統潮流データファイル、６６…事故前系統潮流データファイル、６７…電圧電流データファイル、６８…分散電源出力情報ファイル。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power distribution system monitoring and control device and a program thereof for grasping a state of a distributed power supply in the event of an accident in a system in which a distributed power supply is linked to a power distribution system.
[0002]
[Prior art]
In recent years, small-capacity power sources such as solar power generation, wind power generation, fuel cells, and micro gas turbines have been installed in consumers who consume relatively large amounts of power, and this small-capacity power source has been linked to the distribution system. . The power distribution system is monitored and controlled by a power distribution system monitoring and control device, but usually does not perform monitoring of small-capacity power supplies (hereinafter referred to as distributed power supplies) distributedly installed.
[0003]
The reason for this is that conventional distribution system monitoring and control devices are designed for early power failure recovery in the event of an accident or system switching due to system construction based on information obtained from switches installed in the distribution system. This is because the connection with the power source is not taken into consideration.
[0004]
Hereinafter, conventional techniques will be described with reference to the drawings. FIG. 13 is a general distribution system diagram in which distributed power sources are not linked, and FIG. 14 is a configuration diagram of a distribution system monitoring control device that monitors and controls this distribution system.
[0005]
In FIG. 13, a substation bus (three-phase bus) 4 provided in the distribution substation 1 is linked to a higher system via a distribution transformer 2 and a power receiving circuit breaker 3. Reference numerals 5a to 5c denote distribution line circuit breakers for connecting the substation bus 4 and the distribution lines 6a to 6c. These distribution lines 6a to 6c are respectively connected by section switches 7a-1, 7a-2, 7a-3, 7b-1, 7b-2, 7c-1 to 7c-2 to construct a dendritic distribution network. They are divided into appropriate distribution sections and linked to each other by linkage point switches (also called loop point switches) 8a, 8b, 8c.
[0006]
On the other hand, 14 is a distribution system monitoring and control device (details are shown in FIG. 14) that supervises and controls the distribution lines 6a to 6c connected to the plurality of distribution substations 1, and each of them is connected via the communication line 13-1. The remote monitoring control device 21 installed in the distribution substation 1 is connected. In the example of FIG. 13, only one distribution substation 1 is shown in order to avoid complication of the drawing, but actually, the distribution system monitoring and control device 14 connects each of the plurality of distribution substations. It controls the distribution system equipment.
[0007]
The remote monitoring control device 21 includes slave station devices 9a-1, 9a-2, 9a-3 provided for each of the switches 7a-1, 7a-2, to 8c through another communication line 13-2. , 9a-4, 9b-1, 9b-2, 9c-1, 9c-2, 9c-3, and 9c-4.
[0008]
FIG. 14 is a diagram illustrating a conceptual configuration of the distribution system monitoring control device 14. The distribution system monitoring and control device 14 includes a monitoring control computer 17 and a display operation device 22, and the monitoring control computer 17 includes a system state monitoring unit 25 and a storage device 27 having a device status file 28. ing.
[0009]
FIG. 15 is a diagram showing the file structure of the device status file 28, in which the current on / off state and the standard on / off state are registered for each device, that is, the switches SW1, SW2,.
[0010]
FIG. 16 is a configuration diagram showing a connection relationship between the switch and the slave station device, and here, the switch 7a-1 is shown as an example. The slave station device 9a-1 is configured to be supplied with driving power by the power supply transformer TR1 or the load transformer TR2. In addition, the slave station device 9a-1 is configured to transmit / receive state information and control commands to / from the remote monitoring control device 21 via the communication line 13-2.
[0011]
Next, the operation of the power distribution system will be described with reference to FIGS. 13 to 16 described above. The section switches 7a-1, 7a-2, 7a-3, 7b-1, 7b-2, 7c-1 and 7c-2 are operated in a normally closed state, and the switch 8a which links between the distribution lines, 8b and 8c are operated in the normally open state, but when an accident occurs in the power distribution system, the normally open point and the normally closed point are changed in order to localize the supply trouble, that is, to narrow the power outage section to the smallest possible range. Like to do.
[0012]
The on / off control of each switch is performed from the power distribution system monitoring control device 14 through the remote monitoring control device 21 to the slave station devices 9a-1, 9a-2, 9a-3, 9a-4, 9b-1, 9b-2. , 9c-1, 9c-2, 9c-3, 9c-4.
[0013]
The slave station devices 9a-1, 9a-2, 9b-1, 9b-2, 9c-1, and 9c-2 provided in the normally closed section switch have functions other than the data transmission / reception function for remote control. A function that turns on after a certain detection time (TX time limit) when the state of charge of the distribution line is detected by a transformer, and a function that locks automatic turning on if a power failure occurs again within a certain confirmation time (TY time period) after turning on With this function, when an accident occurs in the power distribution system, the accident occurrence section can be specified.
[0014]
Communication between the remote monitoring control device 21 and the slave station device is performed by a polling method, and the remote monitoring control device 21 sequentially inquires the slave station devices in the same communication line by polling, and the state changes. For example, the state is transmitted to the supervisory control computer 17 in the distribution system supervisory control device 14.
[0015]
Normally, the slave station apparatus is connected so as to secure drive power from the distribution system as shown in FIG. 16, and therefore, if a power failure occurs in the distribution system, the drive power of the slave station apparatus disappears. For this reason, communication cannot be performed between the remote monitoring control device 21 and the slave station device of the power distribution system during the power failure (this state is referred to as a non-response state of the slave station device). At this time, the remote monitoring control device 21 notifies the monitoring control computer 17 that the slave station device is not responding.
[0016]
The system information data collected by the monitoring control computer 17 via the remote monitoring control device 21 is stored in the device status file 28 in the storage device 27 by the system state monitoring means 25.
[0017]
Here, when an accident occurs in the distribution line 6a, the normally closed switches (SW1) 7a-1, (SW2) 7a-2, (SW3) provided in the distribution line 6a after the distribution line breaker 5a is cut off. 7a-3 changes from a closed state to a no-voltage open state, and the slave station device that has lost the drive power supply due to this power failure enters a no-response state. The distribution system monitoring and control device 14 captures and monitors system information data such as the status of the power distribution breaker 5a and the slave station device of the switch via the remote monitoring control device 21 and recognizes it as a power failure state.
[0018]
As described above, the conventional distribution system monitoring and control apparatus performs processing without considering that the distributed power supply is linked to the distribution system. For example, in the case of the following Patent Document 1 (Japanese Patent Application Laid-Open No. 10-248168), when a distribution line accident occurs in a state where a distributed power source is connected to the power distribution system, a consumer who owns the distributed power source has the customer As a basic principle, the power distribution system monitoring and control device side is not configured to recognize whether or not the distributed power source is disconnected.
[0019]
[Patent Document 1]
JP-A-10-248168 (page 2-3, FIG. 1)
[0020]
[Problems to be solved by the invention]
If an operator of the electric power company performs work in this state, there is a risk of electric shock if a reverse power flow from the distributed power source to the distribution system occurs.
The object of the present invention has been made in view of the above points. When a distribution line accident occurs, it is detected whether or not the distributed power source is operating alone, and the occurrence of an electric shock accident or the like due to the isolated operation has occurred. It is an object of the present invention to obtain a distribution system monitoring and control device and a program thereof that can be prevented.
[0021]
[Means for Solving the Problems]
In order to achieve the above object, the distribution system monitoring and control apparatus according to claim 1 is configured to remotely control on / off control of a plurality of switches provided in a distribution system to which distributed power sources are linked via a slave station apparatus. In the distribution system monitoring and control device designed to be controlled, the system state monitoring means for monitoring the state by inputting the system information data collected via the remote monitoring control apparatus, and the system information data obtained through this system state monitoring means A device status file that stores power, presence / absence information of a distributed power source connected to a distribution line, and connection information of a distribution facility, and a device status file that is activated by the system state monitoring means at the time of a distribution line fault and An independent operation judging means for judging whether or not the distributed power source is operating independently at the time of a distribution line accident using the data of the grid connection file. If the single operation determination means determines to be in independent operation of the dispersed power source, characterized by comprising an alarm output means for outputting an alarm.
[0022]
Further, the program executed by the supervisory control computer of the distribution system monitoring and control device according to claim 8 is configured to control on / off control of a plurality of switches provided in the distribution system to which the distributed power supply is linked via the slave station device. This is a program executed by a supervisory control computer of a power distribution system monitoring and control device that is remotely controlled. The system information data collected via the remote monitoring control device is input to the system state monitoring means and obtained through this system state monitoring means. The system information file is stored in the equipment status file, the presence / absence information of the distributed power source connected to the distribution line and the connection information of the distribution equipment are stored in the system connection file. It is determined whether the distributed power source is operating alone at the time of a distribution line accident using the data of If there boss, characterized in that it is executed by the monitoring control computer of the distribution system monitoring and control device for outputting an alarm from the alarm output unit.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the equivalent component through each figure, and the overlapping description is abbreviate | omitted.
[0024]
(First embodiment)
FIG. 1 shows a distribution system diagram in which distributed power sources are linked. The distribution system diagram of FIG. 1 is different from FIG. 13 described above in that the distributed power source 15-1 and the load 16-1 are connected to the distribution line 6a through the switch 8f, and the distribution line 6c is connected through the switch 8g. It is configured to connect the distributed power supply 15-2 and the load 16-2.
[0025]
FIG. 2 is a block diagram mainly showing the function of the monitoring control computer 17 in the distribution system monitoring control device 14 according to the first embodiment. The independent operation determination means 41 is different from the conventional device shown in FIG. The system connection file 43 is added to the alarm output means 42 and the storage device 27.
[0026]
FIG. 3 is a file configuration diagram of the system connection file 43. In FIG. 3A, distributed power supply presence / absence information of presence / absence of distributed power supply is registered for each of the distribution lines 6a, 6b, 6c. Then, in FIG. 3B, the power supply side connection device (connection 1), load side connection device (connection 2), and linkage point connection device (connection 3) of the distribution facility (switch, distributed power source, etc.) are registered and connected to the system. The file is configured. FIG. 4 is a process flow diagram of the single operation determination means 41 of the distributed power source.
[0027]
Next, the operation of the present embodiment will be described with reference to the above drawings.
As described above, in order to localize the trouble of power supply due to an accident, the switches are simultaneously opened without voltage when the distribution line is in a non-voltage state (power failure) due to a trip of the distribution line breaker. On the other hand, since the slave station device takes the drive voltage from the distribution line, when the distribution line is in a no-voltage state, the slave station device is in a non-response state to the remote monitoring control device.
[0028]
The power distribution system monitoring and control device 14 according to the present invention pays attention to this function to determine whether or not the distributed power source is in an independent operation state. In other words, when the distribution circuit breaker trips, if there is a response returned from the slave station device that should originally be in a non-response state, and it is determined that there is a voltage on the distribution line, even after the occurrence of an accident in the distribution system, The distributed power supply 15-1 and the load 16-1 (or the distributed power supply 15-2 and the load 16-2) are balanced and installed on the distributed power supply 15-1 (or 15-2) side. The power distribution system monitoring control device 14 determines that the isolated operation detection device does not operate normally and the distributed power supply 15-1 (15-2) is in the isolated operation state.
[0029]
In FIG. 1, for example, it is assumed that an accident has occurred in the power distribution section between the switches 7a-2 and 7a-3 of the power distribution line 6a, and the power distribution circuit breaker 5a has been interrupted. Then, in FIG. 2, the switch system state monitoring means 25 detects the occurrence of an accident based on the information obtained via the remote monitoring control device 21 and activates the independent operation determination means 41.
[0030]
In the flowchart of FIG. 4, the single operation determination unit 41 extracts system information data from the system connection file 43 and checks whether or not the distributed power source 15-1 is connected to the distribution line 6 a (S <b> 101). In this case, since the distributed power source is connected to the distribution line 6a, the slave station devices 9a-1, 9a-2, 9a-3 and 9a-4 connected to the distribution line 6a are taken out from the system connection file 43, Processing is performed for the number (S102).
[0031]
The independent operation judging means 41 is connected to the switches 7a-1, 7a- from the device status file 28 storing data based on the polling results of the slave station devices 9a-1, 9a-2, 9a-3 and 9a-4. The states of 2, 7a-3 and 7a-4 are taken out (S103). If the switch is a normally-closed switch and there is a response from the slave station device, and if there is a voltage, it is determined that there is a distributed power source that is operating independently in the distribution line 6a (S104).
[0032]
Each slave station device corresponding to the switch connected to the distribution line 6a is polled to check whether it is a normally closed switch and whether there is a response or voltage.
In this case, since the switches 7a-1 and 7a-2 are open without voltage, there is no response from the slave station devices 9a-1 and 9a-2. However, when the switch 8f is not opened and the distributed power source 15-1 is connected to the distribution line 6a, the slave station device 9a-3 is supplied with drive power from the distributed power source. The polling result of the device 9a-3 is a response and a voltage.
[0033]
As a result, the single operation determination unit 41 determines that there is a distributed power source in the single distribution line 6a and activates the alarm output unit 42 (S105). The alarm output means 42 sounds an external alarm device, displays a warning message on the display / operation device 22, and alerts the operator from both hearing and vision.
[0034]
As described above, according to the present embodiment, it is possible to monitor the distributed power supply even if the distributed power supply is linked to the system and the single operation is continued at the time of the accident, with the equipment configuration of the distribution system as it is. Moreover, an electric shock accident can be prevented by alerting the worker.
[0035]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is a block diagram mainly showing the function of the monitoring control computer 17 in the distribution system monitoring control apparatus according to the second embodiment of the present invention, and FIG. 6 is a process flow diagram of the switch opening means. In FIG. 5, reference numeral 45 denotes a switch opening means that is activated when the isolated operation determining means 41 described in the first embodiment determines that there is a distributed power source during isolated operation. When the switch opening means 45 is activated, switch data connected to the distributed power supply is extracted from the device status file 28 and the device connection file 43 and an opening command is output to the corresponding opener.
[0036]
Next, the operation of the present embodiment will be described.
When an accident occurs in the power distribution system, the independent operation determination unit 41 is activated by the system state monitoring unit 25 of FIG. When the isolated operation determining means 41 determines that there is a distributed power source during isolated operation, the alarm output means 42 is activated and the switch opening means 45 is activated.
[0037]
In the process flow diagram of FIG. 6, the switch opening means 45 first takes out the slave station device connected to the distributed power source from the system connection file 43 (S111). If there are a plurality of connected switches, the switch state is checked in order (S112). If the taken out switch is in the on state, has a response, and has a voltage (S113), an open signal is output to the slave station device (S114).
[0038]
In this embodiment, when the load balancing is achieved and the isolated operation detection device of the distributed power supply is not operating, the distributed power supply disconnects a part of the distribution line that is operating independently from the distribution system and breaks the load balance. Thus, the distributed power supply itself is operated so as to be disconnected from the system.
[0039]
As described above, according to the present embodiment, if there is a distributed power source that is operating independently, the switch opening that opens the switch near the distributed power source in order to disconnect the distributed power source that is operating independently from the system. As a result, the distributed power source can be disconnected from the power distribution system with a minimum of operation even when the distributed power source is operating alone, and workers can start work due to a sound power outage. It becomes possible.
[0040]
(Third embodiment)
A third embodiment of the invention will be described with reference to FIGS.
FIG. 7 is a block diagram mainly showing the function of the supervisory control computer 23 in the power distribution system supervisory controller 14 according to the third embodiment of the present invention, and FIG. 8 is a process flow diagram of the opening means before the switch. is there.
[0041]
In FIG. 7, reference numeral 46 denotes a switch full opening means newly provided in the present embodiment, and the distributed power supply is provided in spite of outputting an opening control command from the switch opening means 45 to a switch near the distributed power supply. When the single operation is not resolved, the single operation determination means 41 is activated.
[0042]
Next, the operation of the present embodiment will be described.
In FIG. 7, an accident occurs in the power distribution system, and the independent operation determination unit 41 is activated by the system state monitoring unit 25. When the isolated operation determining means 41 determines that there is a distributed power source during isolated operation, the alarm output means 42 and the switch opening means 45 are activated. If the operation of the switch opening means 45 does not solve the isolated operation of the distributed power source, the isolated operation determination means 41 activates the switch full opening means 46.
[0043]
In the processing flow diagram of the switch full open means in FIG. 8, when the switch full open means 46 is activated, it takes out all the switches connected to the distribution line where the accident occurred from the system connection file 43, and processes the number of switches. (S121). The switch status information is extracted from the device status file storing the polling result of the switch (S122). If the switch is normally closed and the slave station device has a response and a voltage, A switch opening signal is output to the slave station device (S123). This is performed for all switches connected to the distribution line.
[0044]
As described above, according to the present embodiment, in the case where the isolated operation of the distributed power source is not solved despite the fact that the switch near the distributed power source is opened for the purpose of breaking the load balance, a responsive switch is provided. Since the switch is fully open, the distributed power source can be reliably disconnected from the power distribution system even when the distributed power source is operating independently. It is possible to start.
[0045]
(Fourth embodiment)
Next, a fourth embodiment of the invention will be described with reference to FIG.
FIG. 9 is a block diagram mainly showing functions of the supervisory control computer 23 in the distribution system supervisory controller 14 according to the fourth embodiment of the present invention, and FIG. 10 is a configuration diagram of an open switch data file. . In FIG. 9, 51 is a data setting means, 52 is a specific switch control means, and 53 is an open switch data file. The operator inputs data related to the switch that is determined to be optimal to be opened when the distributed power supply is in an independent operation from the display operation device 22 to the data setting means 51 in advance, and the data setting means 51 outputs the open switch data. Stored in the file 53.
[0046]
FIG. 10 is a data file configuration diagram of the open switch 53. In this example, the switch SW3 is registered by the operator as a switch to be opened when an accident occurs in the distribution line 6a, and the switch SW7 is opened when an accident occurs in the distribution line 6c. Since no distributed power source is connected to the distribution line 6b, there is no switch to be registered by the operator.
[0047]
Next, the operation of the present embodiment will be described.
In FIG. 9, when an accident occurs in the power distribution system, the system state monitoring unit 25 activates the isolated operation determining unit 41. When the isolated operation determining unit 41 determines that there is a distributed power source during the isolated operation, the alarm output unit 42 is turned on. At the same time, the specific switch control means 52 is activated.
[0048]
This specific switch control means 52 takes out the data related to the switch that has been stored in the open switch data file 53 in advance by the operator and determined to be operated, and performs the open control. In the case of this example, when a failure occurs in the distribution line 6a, the switch SW3 closest to the power source side from the distributed power source is controlled to be opened. When the distribution system is more complicated and there are a plurality of switches connected to the distributed power supply, a plurality of switches can be registered in the switch data file 53. The specific switch control means 52 controls to open all the switches registered in the switch data file 53.
[0049]
As described above, according to the present embodiment, a switch to be opened when a single operation of a distributed power source is detected at the time of a distribution line fault is set in advance by the data setting means, and the accident is actually caused to the distribution line. When isolated operation of a distributed power source is detected, the switch is controlled so that all switches that the operator has determined to be optimal even when the distributed power source is operating independently. Open control can be performed, the distributed power source can be reliably disconnected from the power distribution system, and the worker can start work due to a sound power outage.
[0050]
(Fifth embodiment)
A fifth embodiment of the invention will be described with reference to FIG. 11 and FIG.
FIG. 11 is a block diagram mainly showing functions of the supervisory control computer 23 in the distribution system supervisory controller 14 according to the fifth embodiment of the present invention, and FIG. 12 is a file structure of various data files provided in FIG. FIG.
[0051]
In FIG. 11, 61 is a tidal current calculating means, and 62 is a pre-accident tidal current saving means for preserving the tidal current before the accident calculated by this tidal current calculating means. 63 is a power flow change point detection means, 64 is a distributed power supply disconnection control means, 65 is a current system power flow data file, 66 is a system power flow data file before an accident, 67 is a voltage / current data file, and 68 is a distributed power output information file. .
[0052]
12A, 12B, 12C, and 12D show the file configurations of the current system power flow data file 65, the pre-accident system power flow data file 66, the voltage / current data file 67, and the distributed power supply output information file 68, respectively. FIG.
[0053]
In FIG. 11, the power flow calculation means 61 periodically includes the current voltage / current data file 67, distribution system facility information held in the computer (information held by the distribution system monitoring device itself to perform its original function). ) And the distributed power supply output information stored in the distributed power supply output information file 68, the power flow calculation of the current distribution system is performed, and the calculation result is stored in the current power flow data file 65. The power flow calculation is performed by obtaining active power and reactive power based on the voltage, current, and phase angle taken from the distribution system, but the calculation method is well known, and the description thereof is omitted.
[0054]
Further, when an accident occurs, the system state monitoring unit 25 activates the single operation determination unit 41 and activates the pre-accident tidal current storage unit 62. As a result, the pre-accident power flow storage means 62 started up copies the contents stored in the current system power data file 65 to the system power data file 66 before the accident.
[0055]
In addition, when the isolated operation determination unit 41 determines that there is a distributed power supply during the isolated operation, it activates the alarm output unit 42 and activates the tidal current change point detection unit 63. This tidal current change point detecting means 63 extracts the pre-accident system power flow of the distribution line where the accident occurred from the pre-accident system power data file 66, and also extracts the current power current stored in the current system power data file 65 and compares them. As a result, among the switches close to the distributed power supply, a location where the flow direction is changed before and after the occurrence of the accident is found, and the switch is notified to the distributed power supply disconnection control means 64.
[0056]
The distributed power supply disconnection control means 64 outputs an open signal to the switch. The place where the flow direction is changing is the place where the load balance is achieved by the independent operation of the distributed power supply, and the load balance by the independent operation of the distributed power supply can be broken by disconnecting the switch at that place from the system Thus, the distributed power supply itself can be spontaneously disconnected from the system.
[0057]
As described above, according to the present embodiment, the distribution system power flow state calculated periodically is stored, and the power flow direction is determined from the power flow state before the accident and the power flow state after the distributed power supply becomes independent operation. It is possible to disconnect the distributed power source from the distribution system by detecting the change point of the switch and controlling the opening of the switch that is the change point, and it is possible for workers to start work due to a healthy power outage state Become.
[0058]
In addition, even if it implements 2nd Embodiment or 4th Embodiment, when it is judged that isolated operation is continuing (when there exists a slave station apparatus which does not change to a no-response state), after that You may make it implement combining 3rd Embodiment or 5th Embodiment as equipment protection. In this way, it becomes possible to more reliably disconnect the distributed power source that is operating independently from the power distribution system.
[Brief description of the drawings]
FIG. 1 is a diagram of a power distribution system in which distributed power sources are linked.
FIG. 2 is a block diagram mainly showing functions of a supervisory control computer of the distribution system supervisory control device according to the first embodiment of the present invention.
FIG. 3 is a configuration diagram of a system connection file.
FIG. 4 is a process flow diagram of an independent operation determination unit.
FIG. 5 is a block diagram mainly showing functions of a supervisory control computer of a distribution system supervisory control device according to a second embodiment of the present invention.
FIG. 6 is a process flow diagram of a switch opening means.
FIG. 7 is a block diagram mainly showing functions of a supervisory control computer of a power distribution system supervisory controller according to a third embodiment of the present invention.
FIG. 8 is a process flow diagram of a switch full opening means.
FIG. 9 is a block diagram mainly showing functions of a supervisory control computer of a power distribution system supervisory control device according to a fourth embodiment of the present invention.
FIG. 10 is a configuration diagram of an open switch data file.
FIG. 11 is a block diagram mainly showing functions of a supervisory control computer of a distribution system supervisory control device according to a fifth embodiment of the present invention.
FIG. 12 is a file configuration diagram of a current system power flow data file, a pre-accident system power flow data file, a voltage / current data file, and a distributed power output information file.
FIG. 13 is a diagram of a simple power distribution system.
FIG. 14 is a configuration diagram of a conventional distribution system monitoring and control apparatus.
FIG. 15 is a configuration diagram of a device status file.
FIG. 16 is a configuration diagram of a slave station device having a switch installed on the distribution system and a function of detecting and removing an accident section.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Distribution substation, 2 ... Distribution transformer, 3 ... Circuit breaker, 4 ... Three-phase bus, 5a-5c ... Circuit breaker, 6a-6c ... Distribution line, 7a-7c ... Switch, 8a-8c, 8f Switch 9a, 9b ... Slave station device, 13 ... Communication line, 14 ... Distribution system monitoring and control device, 15 ... Distributed power source, 16 ... Load, 17 ... Computer for monitoring control, 21 ... Remote monitoring control device, 22 ... Display Operation device, 25: System state monitoring means, 27: Storage device, 28 ... Equipment status file, 41 ... Single operation judgment means, 42 ... Alarm output means, 43 ... System connection file, 45 ... Switch opening means, 46 ... Opening / closing Full opening means 51 ... Data setting means 52 ... Specific switch control means 53 ... Open switch data file 61 ... Tidal current calculation means 62 ... Tidal current storage means before accident 63 ... Tidal flow change point detection means 64 ... Distributed power disconnection control means 65 ... current line trend data file, 66 ... before the accident line tidal data file, 67 ... voltage current data file, 68 ... distributed power output information file.

Claims

In the distribution system monitoring and control device that remotely controls the on / off control of a plurality of switches provided in the distribution system to which the distributed power supply is linked through the slave station device,
System status monitoring means for monitoring the status by inputting system information data collected via the remote monitoring control device;
A device status file that stores system information data obtained through this system state monitoring means;
A grid connection file that stores the presence / absence information of the distributed power supply connected to the distribution line and the distribution equipment connection information,
Independent operation determination means for determining whether or not the distributed power source is operated independently at the time of distribution line accident using the data of the device status file and the system connection file activated by the system state monitoring means at the time of distribution line accident,
A distribution system monitoring and control device comprising: an alarm output means for outputting an alarm when the isolated operation determining means determines that the distributed power supply is operating independently.

When the single operation determination means determines that the distributed power supply is operating independently, a switch that is in the vicinity of the distributed power supply and that has a polling response is stored using the data stored in the device status file and the grid connection file. 2. The distribution system monitoring and control device according to claim 1, further comprising a switch opening control means for performing opening control.

When the open control command is output to a switch that is in the vicinity of the distributed power supply and has a polling response, but the isolated operation by the distributed power supply cannot be resolved, the open control is performed for all the switches that have a polling response. 3. The distribution system monitoring and control device according to claim 2, further comprising a switch full opening means.

Based on the information on the switches that make up the power distribution system, the information on the switches to be opened linked to the distributed power supply is stored in the open switch data file in advance through the data setting means, and the distributed power supply is operating independently. 2. The distribution system monitoring and control device according to claim 1, further comprising: a specific switch control unit that controls to open the set switch when the switch is determined to be.

Power flow calculation means to calculate the power flow of the system from current and voltage information of the switch information constituting the distribution system, pre-accident power storage means to save the power flow before the accident calculated by this power flow calculation means, and dispersion after the accident When it is determined that the power source is operating independently, the tidal current change point detecting means for determining the location where the power flow direction has changed using the pre-accident power flow data and the current power flow data, and the tidal current change point detecting means The distribution system monitoring and control device according to claim 1, further comprising a distributed power supply disconnection control means for controlling opening and closing of the switch at the changed location.

Based on the information on the switches that make up the power distribution system, the information on the switches to be opened linked to the distributed power supply is set in the open switch data file in advance, and it is determined that the distributed power supply is operating independently. Specific switch control means for controlling the opening of the set switch to be opened in this case, and the distributed power supply even though the open control command is output to the switch that is in the vicinity of the distributed power supply and has a polling response A switch full open means for performing open control on all the switches that have a polling response when the isolated operation cannot be resolved, even if an open command is output to the specific switch control means, The distribution system monitoring and control device according to claim 2, wherein when the operation is not canceled, the switch full opening means is operated as a backup.

A switch opening means for controlling the opening of a switch that is in the vicinity of the distributed power supply and has a polling response when the single operation determination means determines that the distributed power supply is operating independently, and a switch constituting the power distribution system It is determined that the power flow calculation means for calculating the power flow of the system from the current and voltage information of the information, the power flow pre-accident storage means for storing the power flow before the accident calculated by this power flow calculation means, and the distributed power source is operating independently. In this case, there are tidal current change point detecting means for judging a place where the tidal current direction has changed using pre-accident tidal current data and current system power flow data, and distributed power supply disconnecting control means for controlling opening and closing of the switch at this changed point. The distributed power supply disconnection control means is operated as a backup when the isolated operation of the distributed power supply is not resolved even if an opening command is output to the switch opening means. Motomeko 1 distribution system monitoring control system according.

A program executed by a supervisory control computer of a distribution system monitoring and control device that remotely controls via a slave station on / off control of a plurality of switches provided in a distribution system to which distributed power sources are linked,
Let the system status monitoring means monitor the status of the distribution system, store the polling results of each slave station device in the device status file, and distribute the presence / absence information of the distributed power source connected to the distribution line and the connection information of the distribution facility to the system connection file To determine whether the distributed power source is operating independently at the time of the distribution line accident, using the data of the device status file and the grid connection file at the time of the distribution line accident. In this case, a program for the distribution system monitoring and control device is characterized in that an alarm is output from the alarm output means.