JP6409954B2 - 電力調整システム及びその制御方法 - Google Patents
電力調整システム及びその制御方法 Download PDFInfo
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- B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
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- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- H02M1/00—Details of apparatus for conversion
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- H02M3/00—Conversion of dc power input into dc power output
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- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Description
図1は、本発明の第1実施形態における燃料電池用の電力調整システム1(以下、単に「電力調整システム1」という)の全体構成を示す図である。本発明の電力調整システム1は、少なくとも燃料電池を駆動源とする車両に用いられるものである。この電力調整システム1は、図1に示すように、例えば、駆動モータ2で車両を駆動する電気自動車に搭載される。なお、この電力調整システム1は、燃料電池を駆動源とするものであれば、燃料電池車両(燃料電池を利用した電気自動車)以外の装置等の負荷にも適用することができる。
以下、本発明の第2実施形態について、第1実施形態との相違点を主として説明する。なお、電力調整システム1の全体構成は同様であるので、図1を用いて説明し、燃料電池用コントローラ10の機能的構成については、図13を用いて説明する。
以下、本発明の第3実施形態について、第1実施形態及び第2実施形態との相違点を主として説明する。なお、電力調整システム1の全体構成は同様であるので、図1を用いて説明し、燃料電池用コントローラ10の機能的構成については、図17を用いて説明する。
Claims (11)
- 負荷に接続される燃料電池と、
前記燃料電池と前記負荷の間に接続されるとともに、複数の相から構成され、該燃料電池の出力電圧を所定の要求電圧比で変換する多相コンバータと、
前記燃料電池の動作状態及び前記負荷の要求電力に応じて、前記多相コンバータの駆動相数及び前記電圧比の少なくとも一方を変更することにより、最も小さいリップル電流となるように、前記多相コンバータの入力電流に対するリプル電流特性を切り替えるリプル電流特性切替部と、
を備える電力調整システム。 - 請求項1に記載の電力調整システムであって、
前記多相コンバータの相数は、3相以上であり、
前記リプル電流特性切替部は、前記燃料電池の出力電圧及び前記多相コンバータの要求電圧比に基づいて、前記多相コンバータの駆動相数を切り替えるとともに、該多相コンバータの駆動相数に基づいて、各相の入力電圧の位相をシフトさせることにより、前記多相コンバータの入出力電圧の電圧比に対するリプル電流を低減させるように前記リプル電流特性を切り替える、
電力調整システム。 - 請求項2に記載の電力調整システムであって、
前記多相コンバータの駆動相数に応じて、前記多相コンバータの入出力の電圧比と前記リプル電流との関係を示すリプル電流特性を記憶するリプル電流特性記憶部をさらに備え、
前記リプル電流特性切替部は、前記多相コンバータの入出力の電圧比に基づいて、いずれの前記多相コンバータの駆動相数のリプル電流特性に切り替えるかを決定し、該決定に応じて、前記多相コンバータの駆動相数を切り替える、
電力調整システム。 - 請求項1から請求項3までのいずれか1項に記載の電力調整システムであって、
前記電力調整システムは、少なくとも前記燃料電池を駆動源とする車両に用いられるものであり、
前記車両を駆動する前記負荷としての駆動モータと、
前記多相コンバータと前記駆動モータの間に接続され、前記駆動モータへの電力をスイッチング制御する駆動インバータと、
前記多相コンバータの入出力の電圧比と前記リプル電流との関係において、該リプル電流が極小となる1つ以上の極小点を記憶する極小点記憶部と、
をさらに備え、
前記リプル電流特性切替部は、前記駆動インバータの動作状態から決定される前記駆動インバータへの供給電圧の下限値と、前記燃料電池の出力電圧とに基づいて、該下限値と該燃料電池の出力電圧との電圧比よりも高い前記極小点を特定し、該特定した極小点に対応する電圧比となるように前記多相コンバータを制御する、
電力調整システム。 - 請求項1から請求項4までのいずれか1項に記載の電力調整システムであって、
前記燃料電池とは異なる電力供給源であるバッテリと、
前記バッテリと前記負荷の間に接続されるバッテリ用コンバータと、
をさらに備え、
前記リプル電流特性切替部は、前記燃料電池の出力電圧に応じて、前記バッテリ用コンバータにより前記負荷に供給される供給電圧を設定し、前記設定された供給電圧に応じて、前記リプル電流特性を切り替える、
電力調整システム。 - 請求項1から請求項5までのいずれか1項に記載の電力調整システムであって、
前記電力調整システムは、少なくとも前記燃料電池を駆動源とする車両に用いられるものであり、
前記車両を駆動する前記負荷としての駆動モータと、
前記多相コンバータと前記駆動モータの間に接続され、前記駆動モータへの電力をスイッチング制御する駆動インバータと、
前記駆動モータの回転数を検出するモータ回転数検出部と、
前記駆動モータのトルクを検出するモータトルク検出部と、
をさらに備え、
前記リプル電流特性切替部は、前記モータ回転数と前記モータトルクに基づいて、前記駆動モータが動作可能な前記駆動インバータの供給電圧を算出する、
電力調整システム。 - 請求項1から請求項6までのいずれか1項に記載の電力調整システムであって、
前記燃料電池のインピーダンス算出要求に応じて、前記燃料電池の出力電流及び出力電圧の交流成分に基づいて、該燃料電池のインピーダンスを算出するインピーダンス算出部と、
前記燃料電池のインピーダンスを算出していない該燃料電池の運転状態においては、過去のインピーダンス算出値と、前記燃料電池の運転状態とに基づいて、該燃料電池の湿潤状態を推定する湿潤状態推定部と、
前記燃料電池の湿潤状態の推定値に基づいて、該燃料電池の発電効率が低下していると判定した場合には、該燃料電池のインピーダンス算出要求を出力するインピーダンス算出要求部と、
をさらに備える電力調整システム。 - 負荷に接続される燃料電池と、前記燃料電池と前記負荷の間に接続されるとともに、複数の相から構成され、該燃料電池の出力電圧を変換する多相コンバータとを備える電力調整システムの制御方法であって、
前記燃料電池の動作状態及び前記負荷の要求電力に応じて、前記多相コンバータの駆動相数及び入出力の電圧比の少なくとも一方を変更し、
前記燃料電池の動作状態に応じて、最も小さいリップル電流となるように、前記多相コンバータの入力電流に対するリプル電流特性を切り替える、
電力調整システムの制御方法。 - 少なくとも燃料電池を駆動源とする車両に用いられる電力調整システムであって、
負荷に接続される燃料電池と、
前記燃料電池と前記負荷の間に接続されるとともに、複数の相から構成され、該燃料電池の出力電圧を所定の要求電圧比で変換する多相コンバータと、
前記車両を駆動する前記負荷としての駆動モータと、
前記多相コンバータと前記駆動モータの間に接続され、前記駆動モータへの電力をスイッチング制御する駆動インバータと、
前記多相コンバータの入出力の電圧比とリプル電流との関係において、該リプル電流が極小となる1つ以上の極小点を記憶する極小点記憶部と、
前記燃料電池の動作状態及び前記負荷の要求電力に応じて、前記多相コンバータの駆動相数及び前記電圧比の少なくとも一方を変更することにより、前記多相コンバータの入力電流に対するリプル電流特性を切り替えるリプル電流特性切替部と、
を備え、
前記リプル電流特性切替部は、前記駆動インバータの動作状態から決定される前記駆動インバータへの供給電圧の下限値と、前記燃料電池の出力電圧とに基づいて、該下限値と該燃料電池の出力電圧との電圧比よりも高い前記極小点を特定し、該特定した極小点に対応する電圧比となるように前記多相コンバータを制御する、
電力調整システム。 - 請求項9に記載の電力調整システムであって、
前記多相コンバータの相数は、3相以上であり、
前記リプル電流特性切替部は、前記燃料電池の出力電圧及び前記多相コンバータの要求電圧比に基づいて、前記多相コンバータの駆動相数を切り替えるとともに、該多相コンバータの駆動相数に基づいて、各相の入力電圧の位相をシフトさせることにより、前記多相コンバータの入出力電圧の電圧比に対するリプル電流を低減させるように前記リプル電流特性を切り替える、
電力調整システム。 - 請求項10に記載の電力調整システムであって、
前記多相コンバータの駆動相数に応じて、前記多相コンバータの入出力の電圧比と前記リプル電流との関係を示すリプル電流特性を記憶するリプル電流特性記憶部をさらに備え、
前記リプル電流特性切替部は、前記多相コンバータの入出力の電圧比に基づいて、いずれの前記多相コンバータの駆動相数のリプル電流特性に切り替えるかを決定し、該決定に応じて、前記多相コンバータの駆動相数を切り替える、
電力調整システム。
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