JP7111792B2 - 交流負荷電力供給システム及び方法 - Google Patents
交流負荷電力供給システム及び方法 Download PDFInfo
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Description
前記直流バスの電圧及びエネルギー貯蔵モジュールの出力電流を収集して、前記エネルギー貯蔵モジュールの出力電力を計算するステップ1と、
前記出力電力を抽出して低周波成分を取得するステップ2と、
第1のエネルギー貯蔵ユニットが前記交流負荷に必要な低周波成分を出力するように、前記低周波成分に従って前記第1のエネルギー貯蔵ユニットの出力電力を調整するステップ3と、
第2のエネルギー貯蔵ユニットが前記交流負荷に必要な高周波電力を出力するように、前記直流バスの電圧基準値に従って前記第2のエネルギー貯蔵ユニットの出力電圧を調整して前記直流バスの電圧を安定させるステップ4と、を含むことを特徴とする。
前記出力電力に従ってその平均電力変化率を計算するステップ21を含み、
前記平均電力変化率が電力変動閾値より大きい場合、前記出力電力をフィルタリングして前記出力電力中の低周波成分を取得し、前記平均電力変化率が電力変動閾値以下である場合、前記出力電力が前記低周波成分となる。
前記第1の充電状態及び前記第2の充電状態に従って、第1の充放電バランス及び第2の充放電バランスをそれぞれ計算するステップ22と、
前記第2の充放電バランス、前記出力電力、及び前記電力変化率に従ってウィンドウ関数を決定し、前記ウィンドウ関数に従って前記フィルタリングモジュールのウィンドウ幅及びウィンドウ形状を調整するステップ23と、
前記第1の充放電バランスに従って予定のカットオフ周波数を調整して、最終的なカットオフ周波数を取得し、時間領域での最終的なカットオフ周波数の応答関数を計算するステップ24と、
前記ウィンドウ関数、前記応答関数、及び前記出力電力に従ってフィルタリング関数を計算するステップ25と、をさらに含む。
ここで、N0は予定のサンプル最小幅であり、F0は予定の目標電力変動率であり、R(t-1)は時刻t-1での充放電バランスである。充電能力が弱いか、又は放電能力が弱い場合、ハイブリッドエネルギー貯蔵システムは、変動が滑らかな場合に出力が制限されるため、フィルタリング効果を弱化する必要があり、電力変動が大きい場合にはフィルタリング効果を強化する必要がある。
ここで、PNは設定値であり、出力電力の離散シーケンスにおけるPESS(n)とPESS(n-1)の差が大きい場合、出力電力が急激に変化したことを表し、フィルタリングされたデータがより滑らかになるように、このビットのデータの重みα(n)を減らす。
9 交流グリッド
10 交流負荷
11 電力供給装置
12 DC/ACコンバータ
13 直流バス
21 電力供給装置
22 DC/ACコンバータ
23 直流バス
31A 電力供給装置
31B 電力供給装置
32 DC/ACコンバータ
41 電力供給装置
42 DC/ACコンバータ
43 直流バス
111 エネルギー貯蔵モジュール
112 コントローラ
211 エネルギー貯蔵モジュール
212 コントローラ
311 エネルギー貯蔵モジュール
312 コントローラ
313 太陽光発電モジュール
411 エネルギー貯蔵モジュール
412 コントローラ
1111 第1のエネルギー貯蔵ユニット
1112 第2のエネルギー貯蔵ユニット
1113 出力ポート
1121 計算ユニット
1122 電力抽出ユニット
1123 電流源制御ユニット
1124 電圧源制御ユニット
2111 第1のエネルギー貯蔵ユニット
2112 第2のエネルギー貯蔵ユニット
2113 出力ポート
3111 第1のエネルギー貯蔵ユニット
3112 第2のエネルギー貯蔵ユニット
4111 第1のエネルギー貯蔵ユニット
4112 第2のエネルギー貯蔵ユニット
Claims (9)
- 電力供給装置及びDC/ACコンバータを含み、
前記DC/ACコンバータの交流側は、交流バスを介して交流グリッド及び交流負荷に結合され、
前記電力供給装置は、直流電気エネルギーを出力し、直流バスを介して前記DC/ACコンバータの直流側に結合され、
前記電力供給装置は、エネルギー貯蔵モジュール及びコントローラを含み、
前記エネルギー貯蔵モジュールは、第1のエネルギー貯蔵ユニット及び第2のエネルギー貯蔵ユニットを含み、前記第1のエネルギー貯蔵ユニットは第1の電池を含み、前記第2のエネルギー貯蔵ユニットは第2の電池を含み、
前記コントローラは、前記第1の電池の第1の充電状態及び前記第2の電池の第2の充電状態を計算し、前記第1の充電状態及び前記第2の充電状態に従ってフィルタリングパラメーターを調整することで、前記エネルギー貯蔵モジュールの出力電力中の低周波成分を抽出するように構成され、
前記コントローラは、前記低周波成分に従って前記第1のエネルギー貯蔵ユニットの変換動作を制御して低周波電力を前記直流バスに出力するようにさらに構成され、前記コントローラはさらに、前記第2のエネルギー貯蔵ユニットの変換動作を制御して高周波電力を前記直流バスに出力するように構成される
ことを特徴とする交流負荷電力供給システム。 - 前記コントローラは、電流源モードで動作して前記低周波電力を出力するように前記第1のエネルギー貯蔵ユニットを制御するように構成され、前記コントローラはさらに、電圧源モードで動作して前記高周波電力を出力するように前記第2のエネルギー貯蔵ユニットを制御するように構成される
ことを特徴とする請求項1に記載の交流負荷電力供給システム。 - 前記第1のエネルギー貯蔵ユニットは、低電力密度エネルギー電池及び第1のDC/DCコンバータを含み、前記コントローラは、前記第1のDC/DCコンバータの出力電流を制御するように構成され、
前記第2のエネルギー貯蔵ユニットは、高電力密度エネルギー電池及び第2のDC/DCコンバータを含み、前記コントローラは、前記第2のDC/DCコンバータの出力電圧を制御するように構成される
ことを特徴とする請求項1又は2に記載の交流負荷電力供給システム。 - 前記エネルギー貯蔵モジュールは、前記直流バスに結合された出力ポートを有し、前記エネルギー貯蔵モジュールは、複数のエネルギー貯蔵ユニットを含み、前記複数のエネルギー貯蔵ユニットの出力端は、並列に接続された後に前記出力ポートに結合され、前記エネルギー貯蔵モジュールの総出力電気エネルギーは、前記出力ポートを介して前記直流バスに送信される
ことを特徴とする請求項1又は2に記載の交流負荷電力供給システム。 - 前記コントローラは、
直流バスの電圧信号及びエネルギー貯蔵モジュールの電流信号に従ってエネルギー貯蔵モジュールの前記出力電力を計算するための計算ユニットと、
前記計算ユニットに結合され、前記出力電力中の前記低周波成分を抽出するための電力抽出ユニットと、
前記電力抽出ユニットに結合され、前記低周波成分に従って第1のエネルギー貯蔵ユニットの出力電力を調整するための電流源制御ユニットと、
直流バスの電圧基準値に従って前記第2のエネルギー貯蔵ユニットの出力電圧を調整し、同時に、前記第2のエネルギー貯蔵ユニットが前記高周波電力を自動的に出力するようにするための電圧源制御ユニットと、を含む
ことを特徴とする請求項1又は2に記載の交流負荷電力供給システム。 - 前記電力抽出ユニットは、
前記出力電力に従って一定期間内の平均電力変化率を計算するための第1の計算モジュールと、
前記平均電力変化率が電力変動閾値より大きい場合に、前記出力電力をフィルタリングして前記出力電力中の前記低周波成分を取得するためのフィルタリングモジュールと、
前記第1の充電状態及び前記第2の充電状態に従って、第1の充放電バランス及び第2の充放電バランスをそれぞれ計算して取得するための第2の計算モジュールと、
前記第2の充放電バランス、前記出力電力、及び前記平均電力変化率に従ってウィンドウ関数を決定して前記フィルタリングモジュールに送信することで、前記ウィンドウ関数に従って前記フィルタリングモジュールのウィンドウ幅及びウィンドウ形状を調整するための第1の調整モジュールと、
前記第1の充放電バランスに従って前記フィルタリングモジュールのカットオフ周波数を調整し、時間領域での前記カットオフ周波数の応答関数を計算して前記フィルタリングモジュールに送信するための第2の調整モジュールと、を含む
ことを特徴とする請求項5に記載の交流負荷電力供給システム。 - 前記フィルタリングモジュールは、前記ウィンドウ関数、前記応答関数、及び前記出力電力に従ってフィルタリング関数を計算し、前記フィルタリング関数に従って前記低周波成分を抽出する
ことを特徴とする請求項6に記載の交流負荷電力供給システム。 - 前記平均電力変化率が電力変動閾値以下である場合、前記出力電力が前記低周波成分となり、前記電流源制御ユニットに出力される
ことを特徴とする請求項6に記載の交流負荷電力供給システム。 - 交流負荷電力供給システムに用いられる交流負荷電力供給方法であって、前記交流負荷電力供給システムは、電力供給装置及びDC/ACコンバータを含み、前記DC/ACコンバータの交流側は、交流バスを介して交流グリッド及び交流負荷に結合され、前記電力供給装置は、直流電気エネルギーを出力し、直流バスを介して前記DC/ACコンバータの直流側に結合され、前記電力供給装置は、エネルギー貯蔵モジュール及びコントローラを含み、前記エネルギー貯蔵モジュールは、第1のエネルギー貯蔵ユニット及び第2のエネルギー貯蔵ユニットを含み、前記第1のエネルギー貯蔵ユニットは第1の電池を含み、前記第2のエネルギー貯蔵ユニットは第2の電池を含み、
前記交流負荷電力供給方法は、
直流バスの電圧及びエネルギー貯蔵モジュールの出力電流に従ってエネルギー貯蔵モジュールの出力電力を計算し、前記第1の電池の第1の充電状態及び前記第2の電池の第2の充電状態を計算するステップ1と、
前記第1の充電状態及び前記第2の充電状態に従ってフィルタリングパラメーターを調整することで、前記出力電力中の低周波成分を抽出するステップ2と、
第1のエネルギー貯蔵ユニットが前記低周波成分を出力するように、第1のエネルギー貯蔵ユニットの出力電力を調整するステップ3と、
第2のエネルギー貯蔵ユニットが高周波電力を出力するように、第2のエネルギー貯蔵ユニットの出力電圧を調整するステップ4と、を含む
ことを特徴とする交流負荷電力供給方法。
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