JP3853917B2

JP3853917B2 - Power storage device

Info

Publication number: JP3853917B2
Application number: JP21319897A
Authority: JP
Inventors: 祐司川越; 鉄義日▲高▼; 和美中田
Original assignee: NTT Facilities Inc
Current assignee: NTT Facilities Inc
Priority date: 1997-08-07
Filing date: 1997-08-07
Publication date: 2006-12-06
Anticipated expiration: 2017-08-07
Also published as: JPH1169656A

Description

【０００１】
【発明の属する技術分野】
この発明は、安価な夜間電力を電力貯蔵手段たとえばナトリウム硫黄電池からなる二次電池に貯蔵し、それを昼間の時間帯に放電する電力貯蔵装置に関する。
【０００２】
【従来の技術】
電力貯蔵手段としてたとえばナトリウム硫黄電池からなる二次電池を使用し、それに電力を貯蔵し、貯蔵した電力を電力消費のピーク時に放電する電力貯蔵装置がある。
【０００３】
電力消費のピーク時に放電することにより、そのピーク分について商用交流電源からの電力消費を削減できることになり、ひいては電気料金を低減できるという、いわゆるピークカット効果が得られる。
【０００４】
このような電力貯蔵装置の運用は、電力会社との間で締結する電力契約が基準となっている。標準的な電力契約（以下、標準電力契約と称す）では、夏季（ 7月〜 9月）の特定期間において、電気料金を高く設定し、他の期間では安い電気料金体系を適用している。
【０００５】
電力契約としては、標準電力契約のほかに、いわゆる季節別・時間帯別電力契約がある。
この季節別・時間帯別電力契約（以下、特定電力契約と称す）の場合、昼間時間帯の電気料金を季節別に異ならせるとともに、とくに標準電力契約に比べ、夜間時間帯の電気料金をかなり安く設定し、逆に昼間時間帯の電気料金については高く設定している。また、特定電力契約の特徴として、暦上の休日及び年末・年始等には一日中、安価な夜間時間帯の電気料金が適用される。
【０００６】
【発明が解決しようとする課題】
二次電池の充電および放電に際しては、装置の運転効率の面から電力損失を生じることが避けられない。
特定電力契約のように、電気料金体系が夜間時間帯と昼間時間帯の別だけでなく平日と休日でも異なる場合には、単に夜間に充電して昼間に放電する運用では、終日にわたり安価な夜間時間帯の電気料金が適用される休日において、上記電力損失の分だけ電力が無駄に消費されることになり、電気料金が余計にかかってしまう。
【０００８】
この発明は上記の事情を考慮したもので、その目的とするところは、特定電力契約の場合の電力の無駄な消費を回避して電気料金の低減効果が確実に得られるとともに、その電気料金の低減効果を標準電力契約の場合と対比して的確に知らせることができる信頼性にすぐれた電力貯蔵装置を提供することにある。
【００１２】
【課題を解決するための手段】
第１の発明（請求項１）の電力貯蔵装置は、商用電源から負荷への電力供給系統に接続され、商用電源の電力を充電しそれを必要に応じて放電する電力貯蔵手段と、夏季の特定期間において電気料金を高く設定し、他の期間では特定期間よりも安い電気料金を適用する標準電力契約に基づく運用を行なうための標準電力契約データ、その標準電力契約での具体的な電気料金を定めた標準電気料金データ、夜間時間帯の電気料金および昼間時間帯の電気料金を季節別・時間帯別に異ならせるとともに、上記標準電力契約に比べて夜間時間帯の電気料金を安く設定し昼間時間帯の電気料金については高く設定し、かつ所定日に夜間時間帯の安価な電気料金を一日中適用する特定電力契約に基づく運用を行なうための特定電力契約データ、その特定電力契約での具体的な電気料金を季節別または時間帯別に定めた特定電気料金データ、を記憶した記憶手段と、この記憶手段内の標準電力契約データおよび特定電力契約データのいずれかを選択するための選択手段と、上記電力貯蔵手段の充電量を検出する充電量検出手段と、この充電量検出手段の検出結果および上記電力貯蔵手段の放電損失に基づき、上記電力貯蔵手段が実際に放電可能な電力量を検出する放電可能電力量検出手段と、上記負荷の消費電力を検出する負荷電力検出手段と、上記選択手段で特定電力契約データが選択されると、その特定電力契約データに基づく夜間時間帯に上記電力貯蔵手段を充電させ、同特定電力契約データに基づく所定日以外の昼間時間帯に上記放電可能電力量検出手段の検出結果分が全て放電されるよう上記電力貯蔵手段を制御し、同特定電力契約データに基づく所定日には上記負荷電力検出手段の検出結果が一定値を超過した場合のみ上記電力貯蔵手段を放電させる制御手段と、上記選択手段で特定電力契約データが選択されたとき、その特定電力契約データに基づく運用によって生じる電気料金と、上記標準電力契約データに基づく運用を仮に行なった場合に生じる電気料金との差額を、上記記憶手段内の特定電気料金データおよび標準電気料金データを用いて算出する電気料金算出手段と、この電気料金算出手段で算出される差額を報知する報知手段と、を備えている。
【００１４】
第２の発明（請求項２）の電力貯蔵装置は、商用電源から負荷への電力供給系統に接続され、商用電源の電力を充電しそれを必要に応じて放電する電力貯蔵手段と、夏季の特定期間において電気料金を高く設定し、他の期間では特定期間よりも安い電気料金を適用する標準電力契約に基づく運用を行なうための電力会社ごとに異なる複数の標準電力契約データ、その各標準電力契約での具体的な電気料金を定めた複数の標準電気料金データ、夜間時間帯の電気料金および昼間時間帯の電気料金を季節別・時間帯別に異ならせるとともに、上記標準電力契約に比べて夜間時間帯の電気料金を安く設定し昼間時間帯の電気料金については高く設定し、かつ所定日に夜間時間帯の安価な電気料金を一日中適用する特定電力契約に基づく運用を行なうための電力会社ごとに異なる複数の特定電力契約データ、その各特定電力契約での具体的な電気料金を季節別または時間帯別に定めた複数の特定電気料金データ、を記憶した記憶手段と、この記憶手段内の各標準電力契約データおよび各特定電力契約データのいずれかを選択するための選択手段と、上記電力貯蔵手段の充電量を検出する充電量検出手段と、この充電量検出手段の検出結果および上記電力貯蔵手段の放電損失に基づき、上記電力貯蔵手段が実際に放電可能な電力量を検出する放電可能電力量検出手段と、上記負荷の消費電力を検出する負荷電力検出手段と、上記選択手段で各特定電力契約データのいずれかが選択されると、その選択された特定電力契約データに基づく夜間時間帯に前記電力貯蔵手段を充電させ、同選択された特定電力契約データに基づく所定日以外の昼間時間帯に上記放電可能電力量検出手段の検出結果分が全て放電されるよう上記電力貯蔵手段を制御し、同選択された特定電力契約データに基づく所定日には上記負荷電力検出手段の検出結果が一定値を超過した場合のみ上記電力貯蔵手段を放電させる制御手段と、上記選択手段で各特定電力契約データのいずれかが選択されたとき、その選択された特定電力契約データに基づく運用によって生じる電気料金と、上記記憶手段内の各標準電力契約データのうち上記選択された特定電力契約データが所属する電力会社の標準電力契約データに基づく運用を仮に行なった場合に生じる電気料金との差額を、上記記憶手段内の各特定電気料金データおよび各標準電気料金データのうち上記選択された特定電力契約データが所属する電力会社の特定電気料金データおよび標準電気料金データを用いて算出する電気料金算出手段と、この電気料金算出手段で算出される差額を報知する報知手段と、を備えている。
【００１６】
【発明の実施の形態】
以下、この発明の一実施例について図面を参照して説明する。
図１に示すように、電力会社の商用交流電源１に電力供給系統２を介して負荷３が接続されるとともに、電力供給系統２に電力貯蔵手段として電力貯蔵装置１０が接続される。
【００１７】
電力貯蔵装置１０は、ナトリウム硫黄電池からなる二次電池１１を備え、商用交流電源１の電力を直流に変換して二次電池１１に充電し、それを必要に応じて放電して交流に変換し出力するもので、さらに制御手段１２、充電量検出手段１３、および負荷電力検出手段１４を備える。
【００１８】
制御手段１２は、コントローラ２０からの制御指令に応じて当該装置１０の充放電（直流・交流変換を含む）を制御する。充電量検出手段１３は、当該装置１０の充電量を検出する。負荷電力検出手段１４は、負荷３の消費電力（いわゆる負荷電力）を検出する。
【００１９】
電力貯蔵装置１０にコントローラ２０が接続され、そのコントローラ２０に、入力装置３１、記憶手段であるメモリ３２、および表示装置３３が接続される。メモリ３２は、標準電力契約データおよび特定電力契約データを記憶し、さらに、標準電力契約用の標準電気料金データおよび特定電力契約用の特定電気料金データを記憶している。
【００２０】
標準電力契約は、夏季（例えば 7月〜 9月）の特定期間において、電気料金を高く設定し、他の期間では特定期間よりも安い電気料金を適用する電力契約である。この標準電力契約に基づく運用を行なうためのデータが標準電力契約データであり、電力会社ごとに異なる例えばＡ社〜Ｊ社までの10社分が用意されている。
【００２１】
標準電力契約での具体的な電気料金を定めたのが標準電気料金データであり、同様にＡ社〜Ｊ社までの10社分が用意されている。
特定電力契約は、一般に季節別・時間帯別電力契約と称されるもので、夜間時間帯の電気料金および昼間時間帯の電気料金を季節別・時間帯別に異ならせるとともに、標準電力契約に比べて夜間時間帯の電気料金をかなり安く設定し、逆に昼間時間帯の電気料金については高く設定し、さらに、所定日たとえば暦上の休日には夜間時間帯の安価な電気料金を一日中適用する電力契約である。この特定電力契約に基づく運用を行なうためのデータが特定電力契約データであり、Ａ社〜Ｊ社までの10社分が用意されている。
【００２２】
特定電力契約での具体的な電気料金を季節別や時間帯別に定めたのが特定電気料金データであり、やはりＡ社〜Ｊ社までの10社分が用意されている。
コントローラ２０は、電力貯蔵装置１０の充電と放電を制御するもので、選択手段２１、カレンダ・時計手段２２、放電可能電力量検出手段２３、運転制御手段２４、電気料金算出手段２５、報知手段２６を備える。
【００２３】
選択手段２１は、管理者による入力装置３１での指定操作に応じてメモリ３２内の各電力契約データのいずれかを選択して読出すとともに、選択された電力契約データが特定電力契約データの場合には、その特定電力契約データが所属する電力会社の特定電気料金データおよび標準電気料金データをメモリ３２から選択的に読出す。
【００２４】
カレンダ・時計手段２２は、暦上の年月日を平日・休日を含めて把握するためのカレンダ機能と、夜間時間帯や昼間時間帯を把握するための時計機能とからなる。
【００２５】
放電可能電力量検出手段２３は、電力貯蔵装置１０における充電量検出手段１３の検出データと、予め記憶している電力貯蔵装置１０の放電損失とに基づき、電力貯蔵装置１０が実際に放電可能な電力量（負荷３へ供給し得る電力量）を検出する。
【００２６】
運転制御手段２４は、次の［１］［２］の機能手段を備える。
［１］選択手段２１で標準電力契約データが選択されると、その標準電力契約データに基づく夜間時間帯に電力貯蔵装置１０を充電させ、同標準電力契約データに基づく昼間時間帯に電力貯蔵装置１０を放電させる機能手段。
【００２７】
［２］選択手段２１で特定電力契約データが選択されると、その特定電力契約データに基づく夜間時間帯に電力貯蔵装置１０を充電させ、同休日以外の昼間時間帯に放電可能電力量検出手段２３の検出結果分が全て放電されるよう電力貯蔵装置１０を制御し、同休日には電力貯蔵装置１０における負荷電力検出手段１４の検出結果が予め定めた一定値を超過した場合のみその超過分を賄うよう電力貯蔵装置１０を放電させる機能手段。
【００２８】
電気料金算出手段２５は、選択手段２１で特定電力契約データが選択されたとき、その特定電力契約データに基づく運用によって生じる電気料金と、同特定電力契約データが所属する電力会社の標準電力契約データに基づく運用を仮に行なった場合に生じる電気料金との差額を、同特定電力契約データに伴ってメモリ３２から読出される特定電気料金データおよび標準電気料金データを用いて算出する。
【００２９】
報知手段２６は、電気料金算出手段２５で算出される電気料金差額を表示装置３３で表示させる。
つぎに、上記の構成の作用を図２のフローチャートを参照して説明する。
【００３０】
商用交流電源１が電力会社Ａ所有の設備であるとする。この場合、入力装置３１における管理者の操作により、電力会社Ａが指定されるとともに、契約種別として標準電力契約および特定電力契約のいずれかが指定される（ステップ101 ）。
【００３１】
標準電力契約が指定されると、電力貯蔵装置１０の充放電による電気料金削減額算出を行ない（ステップ102 、ステップ103 のNO、ステップ104 ）、その削減額を表示装置３３で数値表示あるいはグラフ表示される（ステップ110 ）。
【００３２】
特定電力契約が指定された場合は、メモリ３２内のＡ社特定電力契約データ、Ａ社特定電気料金データ、およびＡ社標準電気料金データが選択されて読出される（ステップ102 ）。
【００３３】
そして、Ａ社特定電力契約データに基づく夜間時間帯に電力貯蔵装置１０が充電される（ステップ103 のYES 、ステップ105,106 ）。
この充電時、電力貯蔵装置１０の充電量が検出される（ステップ107 ）。さらに、検出された充電量と予め記憶されている電力貯蔵装置１０の放電損失とに基づき、電力貯蔵装置１０が実際に放電可能な電力量が検出される（ステップ108 ）。
【００３４】
また、Ａ社特定電力契約データに基づく運用によって生じる電気料金と、Ａ社標準電力契約データに基づく運用を仮に行なった場合に生じる電気料金との差額が、上記読出されたＡ社特定電気料金データおよびＡ社標準電気料金データを用いて算出される（ステップ109 ）。
【００３５】
算出される差額は、すなわち、標準電力契約を選ばずに特定電力契約を選んだことによって得ることのできた電気料金削減額である。この電気料金削減額が表示装置３３で数値表示あるいはグラフ表示される（ステップ110 ）。
【００３６】
管理者は、表示装置３３の表示を見ることにより、特定電力契約を選んだことにより得られる電気料金低減効果を標準電力契約の場合と対比して的確に知ることができる。これにより、特定電力契約の採用による省エネルギ効果を再認識することができ、信頼性の向上につながる。
【００３７】
Ａ社特定電力契約データに基づく休日以外の昼間時間帯においては（ステップ111 ）、上記検出された放電可能電力量が全て放電されるよう、且つピークカット効果が得られるよう、電力貯蔵装置１０の放電が制御される（ステップ112 ）。
【００３８】
ピークカット効果とは、安価な夜間電力を貯蔵し、その貯蔵電力を昼間の時間帯のとくに電力消費のピーク時に放電することにより、そのピーク分について商用交流電源１からの電力消費を削減でき、ひいては電気料金を低減できる効果のことである。
【００３９】
一方、Ａ社特定電力契約データに基づく休日の例えば夜間の所定時間帯になると（ステップ113 のNO）、上記ステップ106 に移行し、電力貯蔵装置１０が充電される。
【００４０】
Ａ社特定電力契約データに基づく休日の例えば昼間の所定時間帯になると（ステップ113 のYES ）、電力貯蔵装置１０において検出されている負荷電力（負荷３の消費電力）のデータが取込まれる（ステップ114 ）。
【００４１】
この負荷電力が一定値以下の場合は（ステップ115 のNO）、電力貯蔵装置１０の放電が禁止される（ステップ116 ）。つまり、負荷３が必要とする電力は、全てが商用交流電源１で賄われる。
【００４２】
負荷電力が増大して一定値を超過した場合は（ステップ115 のYES ）、その超過分を賄うよう、電力貯蔵装置１０が放電される（ステップ117 ）。この場合、負荷３が必要とする電力は、商用交流電源１と電力貯蔵装置１０の両方により賄われる。
【００４３】
このように、安価な電気料金が終日にわたって適用される休日は、負荷電力が増大した場合の必要時以外は電力損失を伴う電力貯蔵装置１０の放電を禁止することにより、電力の無駄な消費を回避し、特定電力契約を採用したことによる電気料金低減効果を確実に得ることができる。
【００４４】
なお、上記実施例では、電力会社が10社ある場合を例に説明したが、その会社数について限定はなく、何社あってもよい。
その他、この発明は上記実施例に限定されるものではなく、要旨を変えない範囲で種々変形実施可能である。
【００４６】
【発明の効果】
以上述べたようにこの発明によれば、特定電力契約の場合の電力の無駄な消費を回避して電気料金の低減効果が確実に得られるとともに、その電気料金の低減効果を標準電力契約の場合と対比して的確に知らせることができる信頼性にすぐれた電力貯蔵装置を提供できる。
【図面の簡単な説明】
【図１】一実施例の構成を示すブロック図。
【図２】同実施例の作用を説明するためのフローチャート。
【符号の説明】
１…商用交流電源
２…電力供給系統
３…負荷
１０…電力貯蔵装置
１１…二次電池
１２…制御手段
１３…充電量検出手段
１４…負荷電力検出手段
２０…コントローラ
２１…選択手段
２２…カレンダ・時計手段
２３…放電可能電力量検出手段
２４…運転制御手段
２５…電気料金算出手段
２６…報知手段
３１…入力装置
３２…メモリ（記憶手段）
３３…表示装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power storage device for storing inexpensive nighttime power in a power storage means, for example, a secondary battery composed of a sodium-sulfur battery, and discharging it in a daytime time zone.
[0002]
[Prior art]
There is a power storage device that uses a secondary battery made of, for example, a sodium-sulfur battery as power storage means, stores power therein, and discharges the stored power at the peak of power consumption.
[0003]
By discharging at the peak of power consumption, it is possible to reduce the power consumption from the commercial AC power supply for the peak, and as a result, the so-called peak cut effect that the electricity bill can be reduced is obtained.
[0004]
The operation of such a power storage device is based on a power contract concluded with an electric power company. In standard power contracts (hereinafter referred to as standard power contracts), electricity charges are set high during a specific period in summer (July to September), and cheap electricity charges are applied during other periods.
[0005]
In addition to standard power contracts, there are so-called seasonal and time-based power contracts.
In the case of this power contract by season and time zone (hereinafter referred to as “specific power contract”), the electricity charge in the daytime time zone varies according to the season, and the electricity charge in the night time zone is considerably cheaper than the standard electricity contract. On the contrary, the electricity charges for daytime hours are set high. In addition, as a feature of the specific power contract, cheaper electricity charges are applied throughout the day and at nighttime during calendar holidays and at the end of the year and the beginning of the year.
[0006]
[Problems to be solved by the invention]
When charging and discharging the secondary battery, it is inevitable that power loss occurs from the viewpoint of the operation efficiency of the apparatus.
When the electricity billing system is different not only in night time and daytime hours but also on weekdays and holidays, as in the case of specific power contracts, in the operation of simply charging at night and discharging in the daytime, it is cheaper throughout the day. On holidays where the electricity charges for the time period are applied, the power is wasted as much as the power loss, resulting in an extra electricity charge.
[0008]
The present invention takes the above circumstances into consideration, and the object of the present invention is to avoid wasteful consumption of power in the case of a specific power contract and to surely obtain an effect of reducing the electricity bill. It is an object of the present invention to provide a highly reliable power storage device capable of accurately reporting the reduction effect as compared with the case of a standard power contract.
[0012]
[Means for Solving the Problems]
A power storage device according to a first aspect of the present invention (Claim 1 ) is connected to a power supply system from a commercial power supply to a load, charges power of the commercial power supply, and discharges it as necessary. Standard power contract data for operation based on a standard power contract that sets a high electricity charge in a specified period and applies a lower electricity charge in a specified period than the specified period, and a specific electricity charge in that standard power contract The standard electricity rate data, the nighttime electricity rate and the daytime electricity rate differ according to the season and time zone, and the nighttime electricity rate is set lower than the standard electricity contract. Specified power contract data for operation based on a specific power contract that sets a high electricity charge for the time zone and applies a cheap electricity charge for the night time zone on a given day all day Select a storage means that stores specific electricity price data in which specific electricity charges in the power contract are determined for each season or time zone, and select either standard power contract data or specified power contract data in this storage means Selection means, a charge amount detection means for detecting the charge amount of the power storage means, a detection result of the charge amount detection means, and a discharge loss of the power storage means, the power storage means can be actually discharged When the specific power contract data is selected by the selection means, the night time based on the specific power contract data is detected. The power storage means is charged in a time zone, and all the detection result of the dischargeable power amount detection means is discharged in a daytime time zone other than a predetermined day based on the specific power contract data. Control means for controlling the power storage means, and discharging the power storage means only when a detection result of the load power detection means exceeds a certain value on a predetermined day based on the specific power contract data; and the selection means When the specific power contract data is selected, the storage means stores the difference between the electricity charge generated by the operation based on the specific power contract data and the electricity charge generated when the operation based on the standard power contract data is temporarily performed. An electricity charge calculating means for calculating using the specific electricity charge data and the standard electricity charge data, and a notifying means for notifying the difference calculated by the electricity charge calculating means.
[0014]
Power storage device of the second invention (claim 2) is connected to a power supply system to the load from the commercial power supply, a power storage means for charging the electric power of the commercial power source discharges it as appropriate, summer Multiple standard power contract data for each power company to operate based on a standard power contract that sets electricity charges high in a specific period and applies electricity charges that are lower than the specified period in other periods, and each standard power Multiple standard electricity price data that specify the specific electricity charges in the contract, nighttime electricity charges and daytime electricity charges differ according to the season and time zone, and at night compared to the above standard electricity contract Operate based on a specific power contract that sets the electricity charges in the time zone cheaply, sets the electricity charges in the daytime time zone high, and applies the cheap electricity charges in the night time zone throughout the day on a given day Storage means for storing a plurality of specific power contract data different for each power company, and a plurality of specific power price data in which specific power charges for each specific power contract are determined by season or time zone, and Selection means for selecting one of each standard power contract data and each specific power contract data in the storage means, a charge amount detection means for detecting the charge amount of the power storage means, and detection of this charge amount detection means Based on the result and the discharge loss of the power storage means, the dischargeable power amount detection means for detecting the amount of power that the power storage means can actually discharge, the load power detection means for detecting the power consumption of the load, and When any one of the specific power contract data is selected by the selection means, the power storage means is charged at night time based on the selected specific power contract data, and the selected power contract data is selected. The power storage means is controlled so that all the detection result of the dischargeable power amount detection means is discharged in the daytime time zone other than the predetermined day based on the constant power contract data, and the predetermined based on the selected specific power contract data On the day, the control means for discharging the power storage means only when the detection result of the load power detection means exceeds a certain value, and the selection means when any one of the specific power contract data is selected by the selection means Temporary operation based on the standard electric power contract data of the electric power company to which the selected specific electric power contract data belongs out of the standard electric power contract data stored in the storage means and the electricity charges generated by the operation based on the specified specific electric power contract data The difference between the electricity price and the electricity price that occurs when it is performed is selected from the specified electricity price data and the standard electricity price data in the storage means. Power rate calculation means that calculates using the specific electricity rate data and standard electricity rate data of the power company to which the power contract data belongs, and notification means that notifies the difference calculated by the electricity rate calculation means .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a load 3 is connected to a commercial AC power supply 1 of an electric power company via a power supply system 2, and a power storage device 10 is connected to the power supply system 2 as power storage means.
[0017]
The power storage device 10 includes a secondary battery 11 made of a sodium-sulfur battery, converts the electric power of the commercial AC power source 1 into a direct current, charges the secondary battery 11, and discharges it as necessary to convert it into an alternating current. And further includes control means 12, charge amount detection means 13, and load power detection means 14.
[0018]
The control means 12 controls charging / discharging (including DC / AC conversion) of the apparatus 10 in accordance with a control command from the controller 20. The charge amount detection means 13 detects the charge amount of the device 10. The load power detection means 14 detects the power consumption of the load 3 (so-called load power).
[0019]
A controller 20 is connected to the power storage device 10, and an input device 31, a memory 32 that is a storage unit, and a display device 33 are connected to the controller 20. The memory 32 stores standard power contract data and specific power contract data, and further stores standard power rate data for standard power contracts and specific power rate data for specific power contracts.
[0020]
The standard power contract is a power contract that sets a high electricity charge in a specific period in summer (for example, July to September) and applies an electricity charge that is lower than the specific period in other periods. Data for performing operations based on the standard power contract is standard power contract data. For example, 10 companies from A to J, which are different for each power company, are prepared.
[0021]
The standard electricity price data defines the specific electricity price in the standard power contract, and 10 companies from Company A to Company J are also prepared.
Specified power contracts are generally referred to as seasonal and hourly power contracts. The electricity charges for night hours and daytime hours are different for each season and time period, and compared to standard power contracts. Set the electricity rate for nighttime hours to be considerably cheaper, conversely, set the electricity rate for daytime hours to be higher, and apply a cheaper electricity rate for nighttime hours on a given day, such as a calendar holiday, throughout the day. It is a power contract. Data for operation based on this specific power contract is specific power contract data, and 10 companies from Company A to Company J are prepared.
[0022]
The specific electricity rate data is determined by the specific electricity contract according to the season and the time zone, and 10 companies from Company A to Company J are also prepared.
The controller 20 controls charging and discharging of the power storage device 10, and includes selection means 21, calendar / clock means 22, dischargeable power amount detection means 23, operation control means 24, electricity bill calculation means 25, notification means 26. Is provided.
[0023]
The selection means 21 selects and reads any one of the power contract data in the memory 32 in accordance with a designation operation on the input device 31 by the administrator, and the selected power contract data is specific power contract data. The specific electricity rate data and the standard electricity rate data of the electric power company to which the specific power contract data belongs are selectively read from the memory 32.
[0024]
The calendar / clock means 22 includes a calendar function for grasping the calendar date including weekdays and holidays, and a clock function for grasping the night time zone and the daytime time zone.
[0025]
The dischargeable power amount detection means 23 can actually discharge the power storage device 10 based on the detection data of the charge amount detection means 13 in the power storage device 10 and the discharge loss of the power storage device 10 stored in advance. The amount of power (the amount of power that can be supplied to the load 3) is detected.
[0026]
The operation control means 24 includes the following functional means [1] [2].
[1] When the standard power contract data is selected by the selection means 21, the power storage device 10 is charged in the night time zone based on the standard power contract data, and the power storage device in the daytime time zone based on the standard power contract data. Functional means for discharging 10.
[0027]
[2] When the specific power contract data is selected by the selecting means 21, the power storage device 10 is charged during the night time zone based on the specific power contract data, and the dischargeable power amount detecting means is used during the day time zone other than the holiday. The power storage device 10 is controlled so that all 23 detection results are discharged, and on the same holiday, only when the detection result of the load power detection means 14 in the power storage device 10 exceeds a predetermined value, the excess Functional means for discharging the power storage device 10 to cover the above.
[0028]
When the selecting unit 21 selects specific power contract data, the electricity rate calculating unit 25 generates the electricity rate generated by the operation based on the specific power contract data and the standard power contract data of the power company to which the specific power contract data belongs. Is calculated using the specific electricity rate data and the standard electricity rate data read from the memory 32 along with the specified power contract data.
[0029]
The notification unit 26 causes the display device 33 to display the electricity rate difference calculated by the electricity rate calculation unit 25.
Next, the operation of the above configuration will be described with reference to the flowchart of FIG.
[0030]
Assume that the commercial AC power source 1 is a facility owned by the electric power company A. In this case, the electric power company A is designated by the operation of the administrator in the input device 31, and either the standard power contract or the specific power contract is designated as the contract type (step 101).
[0031]
When the standard power contract is designated, the electricity charge reduction amount due to charging / discharging of the power storage device 10 is calculated (NO in step 102, step 103, step 104), and the reduction amount is displayed numerically or graphically on the display device 33. (Step 110).
[0032]
When the specific power contract is designated, the A company specific power contract data, the A company specific electricity price data, and the A company standard electricity price data in the memory 32 are selected and read (step 102).
[0033]
Then, the power storage device 10 is charged in the night time zone based on the company A specific power contract data (YES in step 103, steps 105 and 106).
During this charging, the charge amount of the power storage device 10 is detected (step 107). Further, based on the detected charge amount and the discharge loss of the power storage device 10 stored in advance, the amount of power that can be actually discharged by the power storage device 10 is detected (step 108).
[0034]
Further, the difference between the electricity charge generated by the operation based on the company A specific power contract data and the electricity charge generated when the operation based on the company A standard power contract data is temporarily performed is the above-mentioned read out company A specified electricity charge data. And A company standard electricity price data (step 109).
[0035]
The calculated difference is, in other words, the electricity charge reduction amount that can be obtained by selecting the specific power contract without selecting the standard power contract. The electricity charge reduction amount is displayed numerically or graphically on the display device 33 (step 110).
[0036]
By looking at the display on the display device 33, the administrator can accurately know the electricity rate reduction effect obtained by selecting the specific power contract as compared with the case of the standard power contract. Thereby, the energy saving effect by adoption of a specific electric power contract can be recognized again, and it leads to the improvement of reliability.
[0037]
In daytime hours other than holidays based on Company A specific power contract data (step 111), the power storage device 10 is configured so that all the detected dischargeable power amount is discharged and the peak cut effect is obtained. Discharging is controlled (step 112).
[0038]
The peak cut effect is to store cheap nighttime power and discharge the stored power during the daytime, especially at the peak of power consumption, thereby reducing the power consumption from the commercial AC power source 1 for that peak, As a result, this is the effect of reducing the electricity bill.
[0039]
On the other hand, when a predetermined time zone, such as nighttime, on a holiday based on the company A specific power contract data is reached (NO in step 113), the process proceeds to step 106, and the power storage device 10 is charged.
[0040]
When a predetermined time zone, such as daytime, is set based on the company A specific power contract data (eg, YES in step 113), data of load power (power consumption of the load 3) detected in the power storage device 10 is taken ( Step 114).
[0041]
If the load power is below a certain value (NO in step 115), the discharge of the power storage device 10 is prohibited (step 116). That is, the power required by the load 3 is all covered by the commercial AC power source 1.
[0042]
When the load power increases and exceeds a certain value (YES in step 115), the power storage device 10 is discharged so as to cover the excess (step 117). In this case, the power required by the load 3 is provided by both the commercial AC power supply 1 and the power storage device 10.
[0043]
In this way, on holidays when cheap electricity charges are applied throughout the day, wasteful consumption of power is avoided by prohibiting the discharge of the power storage device 10 with power loss except when necessary when the load power increases. By avoiding this, it is possible to reliably obtain the effect of reducing the electricity bill due to the adoption of the specific power contract.
[0044]
In the above-described embodiment, the case where there are 10 electric power companies has been described as an example. However, the number of companies is not limited, and there may be any number of companies.
In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.
[0046]
【The invention's effect】
As described above, according to the present invention, it is possible to avoid the wasteful consumption of electric power in the case of a specific electric power contract and to surely obtain the effect of reducing the electric charge, and to reduce the electric charge in the case of the standard electric power contract. Therefore, it is possible to provide a highly reliable power storage device that can be accurately notified.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment.
FIG. 2 is a flowchart for explaining the operation of the embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Commercial alternating current power supply 2 ... Electric power supply system 3 ... Load 10 ... Electric power storage apparatus 11 ... Secondary battery 12 ... Control means 13 ... Charge amount detection means 14 ... Load electric power detection means 20 ... Controller 21 ... Selection means 22 ... Calendar Clock means 23 ... Dischargeable electric energy detection means 24 ... Operation control means 25 ... Electricity rate calculation means 26 ... Notification means 31 ... Input device 32 ... Memory (storage means)
33 ... Display device

Claims

Power storage means connected to the power supply system from the commercial power source to the load, charging the power of the commercial power source and discharging it as necessary,
Standard power contract data for operation based on standard power contracts that set electricity charges higher during a specific period in summer and apply electricity charges that are lower than the specified period in other periods Standard electricity price data that defines electricity charges, electricity charges for night hours and daytime hours are made different according to seasons and hours, and electricity charges for night hours are set lower than the standard electricity contract. The power charges for daytime hours are set high, and specific power contract data for operation based on a specific power contract that applies low-cost electricity charges for night time on a given day throughout the day. Storage means for storing specific electricity price data that sets specific electricity prices by season or by time zone;
A selection means for selecting either the standard power contract data or the specific power contract data in the storage means;
Charge amount detection means for detecting the charge amount of the power storage means;
Based on the detection result of the charge amount detection means and the discharge loss of the power storage means, the dischargeable power amount detection means for detecting the amount of power that the power storage means can actually discharge;
Load power detection means for detecting power consumption of the load;
When the specific power contract data is selected by the selection means, the power storage means is charged in a night time zone based on the specific power contract data, and the discharge is performed in a daytime time zone other than a predetermined day based on the specific power contract data. The power storage means is controlled so that all the detection result of the possible power amount detection means is discharged, and only when the detection result of the load power detection means exceeds a certain value on a predetermined day based on the specific power contract data Control means for discharging the power storage means;
When the specific power contract data is selected by the selection means, the difference between the electricity charge generated by the operation based on the specific power contract data and the electricity charge generated when the operation based on the standard power contract data is temporarily performed, Electricity rate calculation means for calculating using specific electricity rate data and standard electricity rate data in the storage means;
Informing means for informing the difference calculated by the electricity rate calculating means,
An electric power storage device comprising:

Power storage means connected to the power supply system from the commercial power source to the load, charging the power of the commercial power source and discharging it as necessary,
Multiple standard power contract data for each power company to operate based on a standard power contract that sets electricity charges higher during a specific period in summer and applies electricity charges that are lower than the specified period in other periods. Compared to the standard power contracts, the standard power contract data sets the specific power charges, the electricity data for the night hours and the electricity charges for the daytime hours are different for each season and time zone. Electricity for operation based on a specific power contract that sets electricity charges in the nighttime hours at a low price, sets electricity charges in the daytime hours at a high value, and applies cheap electricity charges in the nighttime hours throughout the day on a given day Multiple specific electricity contract data that differs for each company, and specific electricity price data that specifies the specific electricity charges for each specific electricity contract by season or by time zone And storage means for 憶,
A selection means for selecting either the standard power contract data or the specific power contract data in the storage means;
Charge amount detection means for detecting the charge amount of the power storage means;
Based on the detection result of the charge amount detection means and the discharge loss of the power storage means, the dischargeable power amount detection means for detecting the amount of power that the power storage means can actually discharge;
Load power detection means for detecting power consumption of the load;
When any one of the specific power contract data is selected by the selection means, the power storage means is charged at night time based on the selected specific power contract data, and based on the selected specific power contract data. The power storage means is controlled so that all the detection result of the dischargeable power amount detection means is discharged in the daytime time zone other than the predetermined day, and the load power is determined on the predetermined day based on the selected specific power contract data. Control means for discharging the power storage means only when the detection result of the detection means exceeds a certain value;
When any one of the specific power contract data is selected by the selection means, the electric charge generated by the operation based on the selected specific power contract data and the standard power contract data in the storage means are selected. The difference from the electricity charge that occurs when the operation based on the standard electricity contract data of the electric power company to which the specified power contract data belongs is temporarily calculated, among each specified electricity charge data and each standard electricity charge data in the storage means Electricity rate calculation means for calculating using the specified electricity rate data and standard electricity rate data of the power company to which the selected specified electricity contract data belongs,
Informing means for informing the difference calculated by the electricity rate calculating means,
An electric power storage device comprising: