JP5644650B2 - 電気自動車と家屋間の充放電システム及び充放電装置 - Google Patents
電気自動車と家屋間の充放電システム及び充放電装置 Download PDFInfo
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Description
図1は、この発明の実施の形態1に係る電気自動車と家屋間の充放電システムを示す模式図である。電気自動車と家屋間の充放電システム100は電気自動車1と家屋2から構成されている。電気自動車1と家屋2はそれぞれ二点鎖線で区分け表示されている。充放電システムの動作時には、電気自動車1の通常充電用AC電源ケーブル5は家庭用のAC100VもしくはAC200Vのコンセント7に接続され、家屋2のDC電源ケーブル8は電気自動車1の急速充電用プラグ6に接続される。以降では、各図中、同一符号は同一又は相当部分を示す。
次に本発明の実施の形態1の充放電システムにおいて、電力供給事業者の指令によって充放電制御する場合の動作について説明する。周辺の太陽光発電や風力発電など自家発電の影響によって、局所的に系統の周波数が高くなったり系統の電圧が高くなった場合、電力供給事業者の指令所を通じて、電気自動車のモデム11および家屋のモデム13に、車載バッテリ3への充電指示が来る。
次に本発明の実施の形態1の充放電システムにおいて、夜間電力を用いて車載バッテリ3に充電する場合の動作について説明する。
次に本発明の実施の形態1の充放電システムにおいて、電気自動車1を速やかに充電して、走らせる必要が生じた場合の動作について説明する。予定より多くの走行をして家に戻り、さらに夜間走行しなければならない場合には、深夜電力ではなく昼間の電力を用いて、しかも速やかにできる限り多くの充電を実施する必要が生じる。
図2は、この発明の実施の形態2に係る電気自動車と家屋間の充放電システムを示す模式図である。実施の形態1と異なるのは、家屋2の屋根に太陽電池パネル20を備えており、太陽光による自家発電があることである。太陽電池パネル20は一方向のPV(Photovoltaic)用インバータ21に接続されている。昼間、太陽電池パネル20によって発電された電力は交流ブレーカ15を介して宅内負荷10に使用されるか、売電用電力計22を介して系統に供給される。
自家発電の出力平準化と車載バッテリ3への充電に係る。実施の形態2では、太陽電池パネル20で発電した電力を電気自動車1の車載バッテリ3に充電する。主として通常充電用AC電源ケーブル5と充電専用の一方向AC/DCコンバータ4を介して車載バッテリ3に充電するが、同時に双方向AC/DCコンバータ9とDC電源ケーブル8と急速充電用プラグ6を介して、太陽光発電の出力変動および宅内負荷10の変動を緩和するための充放電を行う。系統の周波数と電圧の変動を緩和できるため電力供給事業者にとって有益な充電を行うことが可能になる。自家発電の出力平準化と車載バッテリ3への充電は、電力供給事業者からの指令をモデム11とモデム13で受けて実施してもよい。
自家発電の出力平準化に係る。太陽光の出力変動によって、系統の周波数が高くなったり、あるいは電圧が高くなった場合には、電力供給事業者からの指令を受けて、仮に、車載バッテリ3が満充電であっても、双方向AC/DCコンバータ9とDC電源ケーブル8と急速充電用プラグ6を用いた太陽電池出力平準化の充放電制御を行う。制御装置12は宅内負荷10の状況に応じて車載バッテリ3を放電させる方向に制御し、充放電可能な電流幅を徐々に広げることで、平準化能力を拡大する。車載バッテリ3のSOCレベルを下げることで、いわゆるHEV(Hybrid Electric Vehicle)走行モードが可能になり、限られたSOC範囲での充放電の繰り返しにより、太陽光の出力変動や宅内負荷の変動を緩和させることができる。
図3は、この発明の実施の形態3に係る電気自動車と家屋間の充放電システムを示す模式図である。実施の形態2との違いは、宅内に双方向DC/DCコンバータ18と宅内蓄電(蓄電装置)19を備えている点である。双方向DC/DCコンバータ18には、双方向AC/DCコンバータ9からDC電源ケーブル8よりも低い直流電圧が供給されている。
車載バッテリ3と宅内蓄電19を併用した自家発電の出力平準化に係る。宅内蓄電19を併用することで、系統の周波数と電圧の安定化の機能を大幅に拡大することが可能になる。宅内蓄電19としては、バッテリでも良いが、キャパシタを用いることで、より瞬時の変動を効率的に吸収することが可能になる。ここでいうキャパシタは、電気二重層キャパシタ(EDLC)、リチウムイオンキャパシタ(LIC)、リチウム電池とキャパシタの複合型キャパシタなどを含む。
宅内蓄電19を用いた車載バッテリ3の充電に係る。宅内蓄電19がキャパシタや急速放電の可能なバッテリであれば、車載バッテリ3への急速充電が可能である。太陽電池パネル20の出力平準化を行いながら、急激な出力上昇分を宅内蓄電19に溜めておいて、双方向DC/DCコンバータ18と双方向AC/DCコンバータ9を介してDC電源ケーブル8と急速充電用プラグ6を介して徐々に直流で車載バッテリ3に充電することも可能であり、系統への出力変動の影響回避と車載充電を両立できる。
停電時における、宅内蓄電19と車載バッテリ3を用いたAC電力供給に係る。商用電源が停電した際にも、宅内蓄電19と車載バッテリ3を緊急電源として用いて宅内負荷10に対して、電力を供給し、家屋2での安全確保のための照明や、冷蔵庫の電源確保による冷凍食品の解凍防止など、ユーザーにメリットの大きな運用が可能になる。また、太陽発電や小型風力など自家発電の利用が可能な場合には、出力平準化と宅内負荷の平準化を宅内蓄電19を用いて行いながら宅内に電力を供給することが可能である。
停電時における、宅内蓄電19と車載バッテリ3を用いたDC電力供給に係る。宅内にDC配電がなされている場合には、宅内蓄電19と車載バッテリ3から双方向DC/DCコンバータ18を介して、直接直流電力を宅内の直流負荷に対して供給することが可能である。さらに、太陽発電や小型風力など自家発電の利用が可能な場合には、DC電圧での出力平準化と宅内負荷10の平準化を、宅内蓄電19を用いて行いながら宅内にDC電力を供給することが可能である。
Claims (7)
- 家屋に設置され交流側口が前記家屋の商用電力に接続され直流側口は電気自動車の急速充電プラグにDC電源ケーブルを介して接続される双方向AC/DCコンバータと、
前記家屋に設置され電力供給事業者からの指令を入手する第1の通信装置と、
前記家屋に設置され前記第1の通信装置が入手した指令に基づいて前記双方向AC/DCコンバータの動作方向を制御する第1の制御装置と、
電気自動車に搭載された車載バッテリと、
前記電気自動車に搭載され直流側口が前記車載バッテリに接続され交流側口は前記家屋のコンセントにAC電源ケーブルを介して接続される一方向AC/DCコンバータと、
前記電気自動車に搭載され前記電力供給事業者からの指令を入手する第2の通信装置と、前記電気自動車に搭載され前記第2の通信装置が入手した指令に基づいて前記一方向AC/DCコンバータの変換状態を制御する第2の制御装置とを備え
前記AC電源ケーブルと前記DC電源ケーブルとの両方を前記電気自動車と前記家屋間とで接続し、かつ、前記AC電源ケーブルで前記車載バッテリを充電すると同時に、前記DC電源ケーブルで前記車載バッテリを充放電する
電気自動車と家屋間の充放電システム。 - 直流電力を発電する自家発電装置と、自家発電装置で発電された直流電力を交流電力に変換するインバータを備えていて、
インバータは第1の制御装置からの指示に基づいて系統または宅内に電力を供給するとともに、
前記充放電システムは、前記DC電源ケーブルを用いた車載バッテリの充放電により前記自家発電装置の出力変動を緩和する
ことを特徴とする請求項1に記載の電気自動車と家屋間の充放電システム。 - 家屋に設置される蓄電装置と、片口が双方向AC/DCコンバータの直流口側に接続され別口が蓄電装置に接続された双方向DC/DCコンバータを備えていて、
双方向DC/DCコンバータは第1の制御装置からの指示に基づいて動作方向を切り替えることを特徴とする請求項1に記載の電気自動車と家屋間の充放電システム。 - 前記充放電システムは、前記DC電源ケーブルを用いた前記車載バッテリの充放電により前記家屋における負荷の変動を緩和することを特徴とする請求項1または請求項2のいずれかに記載の充放電システム。
- 前記充放電システムは、前記DC電源ケーブルを用いた前記車載バッテリの充放電を行うことにより、DC電流とDC電圧とから電圧・電流曲線を構成し、その傾きから前記車載バッテリの状態を診断することを特徴とする請求項1または請求項2のいずれかに記載の充放電システム。
- 家屋に設置され交流側口が前記家屋の商用電力に接続され直流側口は電気自動車の急速充電プラグにDC電源ケーブルを介して接続される双方向AC/DCコンバータと、
前記家屋に設置され電力供給事業者からの指令を入手する第1の通信装置と、
前記家屋に設置され前記第1の通信装置が入手した指令に基づいて前記双方向AC/DCコンバータの動作方向を制御する第1の制御装置と、
前記家屋のコンセントに接続されたAC電源ケーブルであって、直流側口が前記電気自動車に搭載された車載バッテリに接続される一方向AC/DCコンバータの交流側口に接続されるAC電源ケーブルとを備え
前記AC電源ケーブルと前記DC電源ケーブルとの両方を前記電気自動車と前記家屋間とに接続し、かつ、前記AC電源ケーブルで前記車載バッテリを充電すると同時に、前記DC電源ケーブルで前記車載バッテリを充放電する
充放電装置。 - 家屋に設置され交流側口が前記家屋の商用電力に接続され直流側口は電気自動車の急速充電プラグにDC電源ケーブルを介して接続される双方向AC/DCコンバータと、
前記家屋に設置され電力供給事業者からの指令を入手する第1の通信装置と、
前記家屋に設置され前記第1の通信装置が入手した指令に基づいて前記双方向AC/DCコンバータの動作方向を制御する第1の制御装置と、
前記家屋のコンセントに接続されるAC電源ケーブルであって、直流側口が前記電気自動車に搭載された車載バッテリに接続された一方向AC/DCコンバータの交流側口に接続されるAC電源ケーブルとを備え
前記AC電源ケーブルと前記DC電源ケーブルとの両方を前記電気自動車と前記家屋間とに接続し、かつ、前記AC電源ケーブルで前記車載バッテリを充電すると同時に、前記DC電源ケーブルで前記車載バッテリを充電するとともに、前記DC電源ケーブルを用いた充電はDC電流を周期的に増減させる充放電装置。
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