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JP2021125974A - Power supply system and power supply device - Google Patents

Power supply system and power supply device Download PDF

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JP2021125974A
JP2021125974A JP2020018190A JP2020018190A JP2021125974A JP 2021125974 A JP2021125974 A JP 2021125974A JP 2020018190 A JP2020018190 A JP 2020018190A JP 2020018190 A JP2020018190 A JP 2020018190A JP 2021125974 A JP2021125974 A JP 2021125974A
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power
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water electrolysis
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power supply
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JP7438489B2 (en
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竜治 宮川
Ryuji Miyagawa
竜治 宮川
正樹 坂本
Masaki Sakamoto
正樹 坂本
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Yamanashi Prefecture
Nichicon Corp
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Abstract

To provide a power supply system and a power supply device which can smooth transmission power using a water electrolyzer.SOLUTION: A power supply system 1 includes a power generation device 2 and a water electrolyzer 3, to supply water electrolysis power generated based on the generated power of the power generation device 2 to the water electrolyzer 3 to transmit transmission power, in which the water electrolysis power is subtracted from the generated power, to a commercial power system. The power supply system 1 includes a first power conversion device 10 which steps up or down the generated power to output; a second power conversion device 20 which steps up or down fluctuated power which is equivalent to the fluctuation component of the generated power to generate water electrolysis power; and a third power conversion device 30 which converts smoothing power, which is obtained by subtracting fluctuated power from the generated power, into AC to generate transmission power. The second power conversion device 20 controls input fluctuation power so that the water electrolysis power does not exceed the generated power.SELECTED DRAWING: Figure 1

Description

本発明は、電源システムおよび当該電源システムにおいて用いられる電源装置に関する。 The present invention relates to a power supply system and a power supply device used in the power supply system.

従来の電源システムとして、例えば、特許文献１に記載のものが知られている。図２に示すように、特許文献１に記載の電源システム１００は、太陽電池１０１と、第１パワーコンディショナ装置１０２と、蓄電池１０３と、第２パワーコンディショナ装置１０４とを備える。 As a conventional power supply system, for example, the one described in Patent Document 1 is known. As shown in FIG. 2, the power supply system 100 described in Patent Document 1 includes a solar cell 101, a first power conditioner device 102, a storage battery 103, and a second power conditioner device 104.

電源システム１００では、第２パワーコンディショナ装置１０４の制御下で蓄電池１０３を充放電させることにより、太陽電池１０１の発電電力（第１パワーコンディショナ装置１０２で交流に変換された発電電力）の変動成分を吸収し、商用電力系統に送電される送電電力を平滑化している。 In the power supply system 100, by charging and discharging the storage battery 103 under the control of the second power conditioner device 104, the generated power of the solar cell 101 (the generated power converted into alternating current by the first power conditioner device 102) fluctuates. It absorbs components and smoothes the transmitted power transmitted to the commercial power system.

ところで、蓄電池１０３には充放電容量があり、充電または放電の一方向の動作のみを長時間継続させることはできないため、蓄電池１０３の充放電容量を常に監視し、例えば、充電動作を一定時間行ったら、放電動作を行う等の制御が必要になる。 By the way, since the storage battery 103 has a charge / discharge capacity and cannot be continuously charged or discharged in only one direction for a long time, the charge / discharge capacity of the storage battery 103 is constantly monitored, for example, the charging operation is performed for a certain period of time. Then, control such as performing a discharge operation is required.

この点、蓄電池１０３の代わりに水電解装置を用いることで、制御にかかる負荷を軽減することができる。しかしながら、水電解装置は、蓄電池１０３の充電動作に相当する一方向の動作しかできず、蓄電池１０３の放電動作に相当する動作（第２パワーコンディショナ装置１０４側に電力を出力する動作）はできない。このため、単に蓄電池１０３を水電解装置に置き換えただけでは、太陽電池１０１の発電電力の変動成分を安定して吸収することができず、送電電力を平滑化できないおそれがある。 In this respect, by using a water electrolyzer instead of the storage battery 103, the load on the control can be reduced. However, the water electrolyzer can only operate in one direction corresponding to the charging operation of the storage battery 103, and cannot perform the operation corresponding to the discharging operation of the storage battery 103 (the operation of outputting electric power to the second power conditioner device 104 side). .. Therefore, if the storage battery 103 is simply replaced with a water electrolyzer, the variable component of the generated power of the solar cell 101 cannot be stably absorbed, and the transmitted power may not be smoothed.

特開２０１６−１０３９００号公報Japanese Unexamined Patent Publication No. 2016-103900

本発明は上記事情に鑑みてなされたものであって、その課題とするところは、水電解装置を用いて送電電力を平滑化することが可能な電源システムおよび電源装置を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power supply system and a power supply device capable of smoothing transmitted power by using a water electrolyzer.

上記課題を解決するために、本発明に係る電源システムは、
発電装置と水電解装置とを備え、前記発電装置の発電電力に基づいて生成した水電解電力を前記水電解装置に供給し、前記発電電力から前記水電解電力を差し引いた送電電力を商用電力系統に送電する電源システムであって、
前記発電電力が入力され、前記発電電力を昇圧または降圧して直流を出力する第１電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力の変動成分に相当する直流の変動電力が入力され、前記変動電力を昇圧または降圧して生成した直流の前記水電解電力を前記水電解装置に出力する第２電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力から前記変動電力を差し引いた平滑化電力が入力され、前記平滑化電力を交流に変換して前記送電電力を出力する第３電力変換装置と、を備え、
前記第２電力変換装置は、前記水電解電力が前記発電電力を超えないように、入力される前記変動電力を制御することを特徴とする。 In order to solve the above problems, the power supply system according to the present invention
A commercial power system is provided with a power generation device and a water electrolysis device, and supplies water electrolysis power generated based on the power generated by the power generation device to the water electrolysis device, and subtracts the water electrolysis power from the generated power. It is a power supply system that transmits electricity to
A first power converter that receives the generated power and boosts or lowers the generated power to output direct current.
A DC fluctuating power corresponding to a fluctuating component of the generated power that has been boosted or stepped down by the first power converter is input, and the DC water electrolytic power generated by boosting or stepping down the fluctuating power is used as the water electrolysis. The second power converter that outputs to the device and
A third power conversion device that inputs smoothing power obtained by subtracting the variable power from the generated power that has been boosted or stepped down by the first power conversion device, converts the smoothing power into alternating current, and outputs the transmitted power. And with
The second power conversion device is characterized in that the input variable power is controlled so that the water electrolysis power does not exceed the generated power.

この構成によれば、水電解電力を出力する第２電力変換装置は、水電解電力が発電電力を超えないように、入力される変動電力を制御するので、水電解装置単独でも送電電力を平滑化することができる。さらに、この構成によれば、発電電力を交流に変換することなく水電解電力を生成するため、変換効率に優れ、システム全体の小型化およびコストダウンを図ることができる。 According to this configuration, the second power converter that outputs the water electrolyzed power controls the input fluctuating power so that the water electrolyzed power does not exceed the generated power, so that the water electrolyzed device alone smoothes the transmitted power. Can be transformed into. Further, according to this configuration, since water electrolysis power is generated without converting the generated power into alternating current, the conversion efficiency is excellent, and the entire system can be miniaturized and the cost can be reduced.

上記電源システムにおいて、
前記第２電力変換装置は、前記平滑化電力または前記送電電力の目標値を算出し、前記平滑化電力または前記送電電力の電力値が前記目標値に近づくように、入力される前記変動電力を制御するよう構成できる。 In the above power supply system
The second power conversion device calculates a target value of the smoothed power or the transmitted power, and inputs the variable power so that the power value of the smoothed power or the transmitted power approaches the target value. Can be configured to control.

上記電源システムにおいて、
前記第２電力変換装置は、前記発電電力の電力値の移動平均を算出し、前記移動平均から所定のバイアス値を差し引いて前記目標値を算出するよう構成できる。ここで、バイアス値としては、水電解装置から発生させる水素の必要量に応じた値に設定することが好ましい。 In the above power supply system
The second power conversion device can be configured to calculate a moving average of the power values of the generated power and subtract a predetermined bias value from the moving average to calculate the target value. Here, the bias value is preferably set to a value according to the required amount of hydrogen generated from the water electrolyzer.

上記電源システムにおいて、
前記第２電力変換装置は、前記発電電力の増減に応じて前記水電解電力を増減させることで、前記第１電力変換装置と前記第２電力変換装置および前記第３電力変換装置とを相互に接続する直流バスの電圧を一定に保つ制御を行うよう構成できる。 In the above power supply system
The second power conversion device mutually increases or decreases the water electrolytic power according to the increase or decrease of the generated power, thereby causing the first power conversion device, the second power conversion device, and the third power conversion device to interact with each other. It can be configured to control to keep the voltage of the connected DC bus constant.

上記課題を解決するために、本発明に係る電源装置は、
発電装置の発電電力に基づいて生成した水電解電力を水電解装置に供給し、前記発電電力から前記水電解電力を差し引いた送電電力を商用電力系統に送電する電源システムにおいて用いられる電源装置であって、
前記発電電力が入力され、前記発電電力を昇圧または降圧して直流を出力する第１電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力の変動成分に相当する直流の変動電力が入力され、前記変動電力を昇圧または降圧して生成した直流の前記水電解電力を前記水電解装置に出力する第２電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力から前記変動電力を差し引いた平滑化電力が入力され、前記平滑化電力を交流に変換して前記送電電力を出力する第３電力変換装置と、を備え、
前記第２電力変換装置は、前記水電解電力が前記発電電力を超えないように、入力される前記変動電力を制御することを特徴とする。 In order to solve the above problems, the power supply device according to the present invention
It is a power supply device used in a power supply system that supplies the water electrolysis power generated based on the power generated by the power generation device to the water electrolysis device and transmits the transmission power obtained by subtracting the water electrolysis power from the generated power to the commercial power system. hand,
A first power converter that receives the generated power and boosts or lowers the generated power to output direct current.
A DC fluctuating power corresponding to a fluctuating component of the generated power that has been boosted or stepped down by the first power converter is input, and the DC water electrolytic power generated by boosting or stepping down the fluctuating power is used as the water electrolysis. The second power converter that outputs to the device and
A third power conversion device that inputs smoothing power obtained by subtracting the variable power from the generated power that has been boosted or stepped down by the first power conversion device, converts the smoothing power into alternating current, and outputs the transmitted power. And with
The second power conversion device is characterized in that the input variable power is controlled so that the water electrolysis power does not exceed the generated power.

この構成によれば、水電解電力を出力する第２電力変換装置は、水電解電力が発電電力を超えないように、入力される変動電力を制御するので、水電解装置単独でも送電電力を平滑化することができる。さらに、この構成によれば、発電電力を交流に変換することなく水電解電力を生成するため、変換効率に優れ、システム全体の小型化およびコストダウンを図ることができる。 According to this configuration, the second power converter that outputs the water electrolyzed power controls the input fluctuating power so that the water electrolyzed power does not exceed the generated power, so that the water electrolyzed device alone smoothes the transmitted power. Can be transformed into. Further, according to this configuration, since water electrolysis power is generated without converting the generated power into alternating current, the conversion efficiency is excellent, and the entire system can be miniaturized and the cost can be reduced.

本発明によれば、水電解装置を用いて送電電力を平滑化することが可能な電源システムおよび電源装置を提供することができる。 According to the present invention, it is possible to provide a power supply system and a power supply device capable of smoothing the transmitted power by using a water electrolyzer.

本発明に係る電源システムのブロック図である。It is a block diagram of the power supply system which concerns on this invention. 従来の電源システムのブロック図である。It is a block diagram of a conventional power supply system.

以下、添付図面を参照して、本発明に係る電源システムおよび電源装置の実施形態について説明する。 Hereinafter, embodiments of a power supply system and a power supply device according to the present invention will be described with reference to the accompanying drawings.

図１に、本発明の一実施形態に係る電源システム１を示す。電源システム１は、発電装置２と、水電解装置３と、本発明の一実施形態に係る電源装置４とを備える。 FIG. 1 shows a power supply system 1 according to an embodiment of the present invention. The power supply system 1 includes a power generation device 2, a water electrolysis device 3, and a power supply device 4 according to an embodiment of the present invention.

発電装置２は、再生可能エネルギーを利用して発電し、直流の発電電力を出力する。発電装置２は、本実施形態では、太陽電池で構成される。 The power generation device 2 uses renewable energy to generate power, and outputs DC power generation. In the present embodiment, the power generation device 2 is composed of a solar cell.

水電解装置３は、電気エネルギー（本実施形態では、電源装置４から出力される直流の水電解電力）により水を分解して水素を生成する。水電解装置３によって生成された水素は、産業プロセス、材料加工、添加剤、水素ステーション、燃料電池装置、ボイラー、パイプラインなど多様な需要用途に向けて供給される。 The water electrolyzer 3 decomposes water by electric energy (in this embodiment, DC water electrolysis power output from the power supply device 4) to generate hydrogen. The hydrogen produced by the water electrolyzer 3 is supplied for various demand applications such as industrial processes, material processing, additives, hydrogen stations, fuel cell devices, boilers, and pipelines.

電源装置４は、第１電力変換装置１０と、第２電力変換装置２０と、第３電力変換装置３０と、これらの装置を相互に接続する直流バス４０とを備える。 The power supply device 4 includes a first power conversion device 10, a second power conversion device 20, a third power conversion device 30, and a DC bus 40 that connects these devices to each other.

第１電力変換装置１０は、第１ＤＣ／ＤＣ電力変換部１１および第１制御部１２を備え、第２電力変換装置２０は、第２ＤＣ／ＤＣ電力変換部２１および第２制御部２２を備え、第３電力変換装置３０は、ＤＣ／ＡＣ電力変換部３１および第３制御部３２を備える。第１制御部１２、第２制御部２２および第３制御部３２は、相互に通信可能に構成されている。発電装置２が風力発電など交流を出力する場合、第１電力変換装置１０は、ＡＣ／ＤＣ電力変換部またはＡＣ／ＤＣ電力変換部とＤＣ／ＤＣ電力変換部と、制御部を備えてもよい。 The first power conversion device 10 includes a first DC / DC power conversion unit 11 and a first control unit 12, and the second power conversion device 20 includes a second DC / DC power conversion unit 21 and a second control unit 22. The third power conversion device 30 includes a DC / AC power conversion unit 31 and a third control unit 32. The first control unit 12, the second control unit 22, and the third control unit 32 are configured to be able to communicate with each other. When the power generation device 2 outputs alternating current such as wind power generation, the first power conversion device 10 may include an AC / DC power conversion unit or an AC / DC power conversion unit, a DC / DC power conversion unit, and a control unit. ..

第１ＤＣ／ＤＣ電力変換部１１は、入力側に発電装置２が接続され、出力側に直流バス４０を介して第２ＤＣ／ＤＣ電力変換部２１およびＤＣ／ＡＣ電力変換部３１が接続される。第１ＤＣ／ＤＣ電力変換部１１は、第１制御部１２の制御下で、入力された直流の発電電力を昇圧または降圧して直流バス４０に出力する。 In the first DC / DC power conversion unit 11, the power generation device 2 is connected to the input side, and the second DC / DC power conversion unit 21 and the DC / AC power conversion unit 31 are connected to the output side via the DC bus 40. Under the control of the first control unit 12, the first DC / DC power conversion unit 11 boosts or lowers the input DC generated power and outputs it to the DC bus 40.

第１制御部１２は、例えば、マイコンおよび／または専用のＩＣからなり、第１ＤＣ／ＤＣ電力変換部１１に入力される発電装置２の発電電力が最大になるように、第１ＤＣ／ＤＣ電力変換部１１に対してＭＰＰＴ制御（最大電力点追従制御）を行う。 The first control unit 12 is composed of, for example, a microcomputer and / or a dedicated IC, and the first DC / DC power conversion is performed so that the power generated by the power generation device 2 input to the first DC / DC power conversion unit 11 is maximized. MPPT control (maximum power point tracking control) is performed on the unit 11.

第２ＤＣ／ＤＣ電力変換部２１は、入力側に直流バス４０が接続され、出力側に水電解装置３が接続される。第２ＤＣ／ＤＣ電力変換部２１は、第２制御部２２の制御下で、入力された直流電力を昇圧または降圧し、当該昇圧または降圧した直流電力を水電解電力として水電解装置３に出力する。 In the second DC / DC power conversion unit 21, the DC bus 40 is connected to the input side, and the water electrolyzer 3 is connected to the output side. Under the control of the second control unit 22, the second DC / DC power conversion unit 21 boosts or lowers the input DC power, and outputs the boosted or lowered DC power to the water electrolyzer 3 as water electrolysis power. ..

第２制御部２２は、例えば、マイコンおよび／または専用のＩＣからなる。第２制御部２２は、発電電力の変動成分に相当する直流の変動電力が第２ＤＣ／ＤＣ電力変換部２１に入力されるように、水電解電力が発電電力を超えない範囲で第２ＤＣ／ＤＣ電力変換部２１に入力される変動電力を制御する。 The second control unit 22 includes, for example, a microcomputer and / or a dedicated IC. The second control unit 22 has a second DC / DC within a range in which the water electrolytic power does not exceed the generated power so that the DC fluctuating power corresponding to the fluctuating component of the generated power is input to the second DC / DC power conversion unit 21. It controls the variable power input to the power conversion unit 21.

具体的には、第２制御部２２は、まず発電電力の電力値を取得する。例えば、第２制御部２２は、発電装置２の出力電流および出力電圧を検出する不図示の電流検出手段および電圧検出手段の検出結果に基づいて、発電電力の電力値を算出してもよいし、第１制御部１２と通信を行い、第１制御部１２から発電電力の電力値を取得してもよい。また、発電電力の電力値の代わりに、第１ＤＣ／ＤＣ電力変換部１１で昇圧または降圧された後の発電電力の電力値を取得してもよい。 Specifically, the second control unit 22 first acquires the power value of the generated power. For example, the second control unit 22 may calculate the power value of the generated power based on the detection results of the current detecting means and the voltage detecting means (not shown) that detect the output current and the output voltage of the power generation device 2. , The power value of the generated power may be acquired from the first control unit 12 by communicating with the first control unit 12. Further, instead of the power value of the generated power, the power value of the generated power after being boosted or stepped down by the first DC / DC power conversion unit 11 may be acquired.

発電電力の電力値を取得した第２制御部２２は、平滑化電力（発電電力から変動電力を差し引くことで平滑化された電力）の目標値を算出する。例えば、第２制御部２２は、発電電力の電力値の移動平均を算出し、上記のとおり水電解電力が発電電力を超えないように当該移動平均から所定のバイアス値を差し引くことで、平滑化電力の目標値を算出する。 The second control unit 22 that has acquired the power value of the generated power calculates the target value of the smoothed power (the power smoothed by subtracting the variable power from the generated power). For example, the second control unit 22 calculates a moving average of the power value of the generated power, and as described above, smoothes by subtracting a predetermined bias value from the moving average so that the water electrolysis power does not exceed the generated power. Calculate the target value of electric power.

第２制御部２２は、上記バイアス値を水電解装置３の定格電力よりも小さい値（例えば、定格電力の１／２）に設定する。第２制御部２２は、発電電力の変動が小さいときはバイアス値を設定値に維持する一方、発電電力の変動がプラス側に大きくなれば水電解装置３の定格電力を超えない範囲でバイアス値を大きくし、発電電力の変動がマイナス側に大きくなればバイアス値を小さくする。 The second control unit 22 sets the bias value to a value smaller than the rated power of the water electrolyzer 3 (for example, 1/2 of the rated power). The second control unit 22 maintains the bias value at the set value when the fluctuation of the generated power is small, while the bias value does not exceed the rated power of the water electrolyzer 3 when the fluctuation of the generated power becomes large on the positive side. If the fluctuation of the generated power becomes large on the negative side, the bias value is reduced.

平滑化電力の目標値を算出した第２制御部２２は、所定の周期で平滑化電力の電力値を取得する。例えば、第２制御部２２は、ＤＣ／ＡＣ電力変換部３１の入力電流および入力電圧を検出する不図示の電流検出手段および電圧検出手段の検出結果に基づいて、平滑化電力の電力値を算出してもよいし、第３制御部３２と通信を行い、第３制御部３２から平滑化電力の電力値を取得してもよい。また、平滑化電力の電力値の代わりに、商用電力系統に送電される送電電力の電力値を取得してもよい。その場合、第２制御部２２は、送電電力の目標値を算出しておくことが好ましい。 The second control unit 22 that has calculated the target value of the smoothing power acquires the power value of the smoothing power at a predetermined cycle. For example, the second control unit 22 calculates the power value of the smoothing power based on the detection results of the current detecting means and the voltage detecting means (not shown) that detect the input current and the input voltage of the DC / AC power conversion unit 31. Alternatively, the power value of the smoothing power may be obtained from the third control unit 32 by communicating with the third control unit 32. Further, instead of the power value of the smoothing power, the power value of the transmitted power transmitted to the commercial power system may be acquired. In that case, it is preferable that the second control unit 22 calculates the target value of the transmitted power.

第２制御部２２は、平滑化電力（または送電電力）の電力値が目標値に近づくように、第２ＤＣ／ＤＣ電力変換部２１に入力される変動電力の制御（例えば、フィードバック制御）を行う。これにより、水電解装置３は、変動電力に応じた水電解電力を吸収することができる。なお、第２制御部２２は、電力変換部２１の出力電力（水電解電力）を制御することで、第２ＤＣ／ＤＣ電力変換部２１に入力される変動電力を間接的に制御してもよい。 The second control unit 22 controls the variable power input to the second DC / DC power conversion unit 21 (for example, feedback control) so that the power value of the smoothing power (or transmitted power) approaches the target value. .. As a result, the water electrolysis device 3 can absorb the water electrolysis power corresponding to the fluctuating power. The second control unit 22 may indirectly control the variable power input to the second DC / DC power conversion unit 21 by controlling the output power (water electrolysis power) of the power conversion unit 21. ..

また、第２制御部２２は、上記の制御（例えば、フィードバック制御）と併せて、発電電力の増減に応じて水電解電力を増減させつつ、直流バス４０の電圧を一定に保つ制御を行うことが好ましい。 In addition to the above control (for example, feedback control), the second control unit 22 controls to keep the voltage of the DC bus 40 constant while increasing or decreasing the water electrolysis power according to the increase or decrease of the generated power. Is preferable.

ＤＣ／ＡＣ電力変換部３１は、入力側に直流バス４０が接続され、出力側に商用電力系統が接続される。ＤＣ／ＡＣ電力変換部３１は、第３制御部３２の制御下で、入力された直流の平滑化電力を交流の送電電力に変換し、当該送電電力を商用電力系統に送電させる。 In the DC / AC power conversion unit 31, the DC bus 40 is connected to the input side, and the commercial power system is connected to the output side. Under the control of the third control unit 32, the DC / AC power conversion unit 31 converts the input DC smoothing power into AC power transmission power, and transmits the power transmission power to the commercial power system.

第３制御部３２は、例えば、マイコンおよび／または専用のＩＣからなり、平滑化された緩やかな変化の送電電力が商用電力系統に送電されるように、ＤＣ／ＡＣ電力変換部３１のＤＣ／ＡＣ変換動作を制御する。 The third control unit 32 is composed of, for example, a microcomputer and / or a dedicated IC, and the DC / of the DC / AC power conversion unit 31 is such that the smoothed and slowly changing transmission power is transmitted to the commercial power system. Controls AC conversion operation.

結局、本実施形態では、水電解電力が発電電力を超えないように、第２制御部２２が第２ＤＣ／ＤＣ電力変換部２１に入力される変動電力の制御を行うので、水電解装置３だけでも（例えば、蓄電池を並設しなくても）送電電力を平滑化することができる。 After all, in the present embodiment, since the second control unit 22 controls the variable power input to the second DC / DC power conversion unit 21 so that the water electrolysis power does not exceed the generated power, only the water electrolysis device 3 is used. However, the transmitted power can be smoothed (for example, without arranging storage batteries side by side).

さらに、本実施形態では、第１ＤＣ／ＤＣ電力変換部１１と第２ＤＣ／ＤＣ電力変換部２１とが直流バス４０で接続されている。これにより、第１ＤＣ／ＤＣ電力変換部１１がＭＰＰＴ動作（最大電力点追従動作）を行って直流の発電電力を出力し、当該発電電力を交流に変換することなく、第２ＤＣ／ＤＣ電力変換部２１が直流の水電解電力を生成して水電解装置３に供給することができる。したがって、本実施形態に係る電源システム１および電源装置４は、変換効率に優れている。 Further, in the present embodiment, the first DC / DC power conversion unit 11 and the second DC / DC power conversion unit 21 are connected by a DC bus 40. As a result, the first DC / DC power conversion unit 11 performs MPPT operation (maximum power point tracking operation) to output DC generated power, and the second DC / DC power conversion unit does not convert the generated power into AC. 21 can generate DC water electrolysis power and supply it to the water electrolysis device 3. Therefore, the power supply system 1 and the power supply device 4 according to the present embodiment are excellent in conversion efficiency.

また、ＤＣ／ＤＣ電力変換部は、ＤＣ／ＡＣ電力変換部（またはＡＣ／ＤＣ変換部）と比較して小型化および低コスト化に有利である。このため、発電電力を交流に変換することなく水電解電力を生成できる電源システム１および電源装置４は、システム全体および装置全体の小型化やコストダウンを図ることができる。 Further, the DC / DC power conversion unit is advantageous in miniaturization and cost reduction as compared with the DC / AC power conversion unit (or AC / DC conversion unit). Therefore, the power supply system 1 and the power supply device 4 capable of generating water electrolysis power without converting the generated power into alternating current can reduce the size and cost of the entire system and the entire device.

以上、本発明に係る電源システムおよび電源装置の実施形態について説明したが、本発明は上記実施形態に限定されるものではない。 Although the power supply system and the power supply device embodiment according to the present invention have been described above, the present invention is not limited to the above embodiment.

本発明に係る電源装置は、発電電力が入力され、当該発電電力を昇圧または降圧して直流を出力する第１電力変換装置と、直流の変動電力が入力され、当該変動電力を昇圧または降圧して生成した直流の水電解電力を水電解装置に出力する第２電力変換装置と、直流の平滑化電力が入力され、当該平滑化電力を交流に変換して送電電力を出力する第３電力変換装置とを備え、第２電力変換装置は、水電解電力が発電電力を超えないように、入力される変動電力を制御するのであれば、適宜構成を変更できる。 The power supply device according to the present invention is a first power conversion device in which generated power is input and the generated power is boosted or stepped down to output DC, and a DC variable power is input to boost or step down the variable power. A second power conversion device that outputs the DC water electrolysis power generated in the process to the water electrolysis device, and a third power conversion that inputs the DC smoothing power and converts the smoothing power into AC power to output the transmitted power. The second power conversion device includes the device, and the configuration can be appropriately changed as long as the input variable power is controlled so that the water electrolytic power does not exceed the generated power.

例えば、上記実施形態に係る電源システム１において、ＥＭＳコントローラ等で構成される統括制御部を設けた場合、統括制御部が、第１制御部１２、第２制御部２２および第３制御部３２の機能の少なくとも一部を備えていてもよい。 For example, in the power supply system 1 according to the above embodiment, when the integrated control unit composed of the EMS controller or the like is provided, the integrated control unit is the first control unit 12, the second control unit 22, and the third control unit 32. It may have at least some of its functionality.

本発明に係る電源システムは、上記本発明に係る電源装置と、発電装置と、水電解装置とを備えるのであれば、適宜構成を変更できる。 If the power supply system according to the present invention includes the power supply device, the power generation device, and the water electrolysis device according to the present invention, the configuration can be appropriately changed.

本発明の発電装置は、再生可能エネルギーを利用して発電し、直流の発電電力を出力するのであれば、太陽電池以外の手段（例えば、風力発電手段）で構成できる。 The power generation device of the present invention can be configured by means other than a solar cell (for example, wind power generation means) as long as it generates power by using renewable energy and outputs DC power generation.

１ 電源システム
２ 発電装置
３ 水電解装置
４ 電源装置
１０ 第１電力変換装置
１１ 第１ＤＣ／ＤＣ電力変換部
１２ 第１制御部
２０ 第２電力変換装置
２１ 第２ＤＣ／ＤＣ電力変換部
２２ 第２制御部
３０ 第３電力変換装置
３１ ＤＣ／ＡＣ電力変換部
３２ 第３制御部
４０ 直流バス 1 Power supply system 2 Power generation device 3 Water electrolysis device 4 Power supply device 10 1st power conversion device 11 1st DC / DC power conversion unit 12 1st control unit 20 2nd power conversion device 21 2nd DC / DC power conversion unit 22 2nd control Unit 30 Third power conversion device 31 DC / AC power conversion unit 32 Third control unit 40 DC bus

Claims (5)

発電装置と水電解装置とを備え、前記発電装置の発電電力に基づいて生成した水電解電力を前記水電解装置に供給し、前記発電電力から前記水電解電力を差し引いた送電電力を商用電力系統に送電する電源システムであって、
前記発電電力が入力され、前記発電電力を昇圧または降圧して直流を出力する第１電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力の変動成分に相当する直流の変動電力が入力され、前記変動電力を昇圧または降圧して生成した直流の前記水電解電力を前記水電解装置に出力する第２電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力から前記変動電力を差し引いた平滑化電力が入力され、前記平滑化電力を交流に変換して前記送電電力を出力する第３電力変換装置と、を備え、
前記第２電力変換装置は、前記水電解電力が前記発電電力を超えないように、入力される前記変動電力を制御することを特徴とする電源システム。 A commercial power system is provided with a power generation device and a water electrolysis device, and supplies water electrolysis power generated based on the power generated by the power generation device to the water electrolysis device, and subtracts the water electrolysis power from the generated power. It is a power supply system that transmits electricity to
A first power converter that receives the generated power and boosts or lowers the generated power to output direct current.
A DC fluctuating power corresponding to a fluctuating component of the generated power that has been boosted or stepped down by the first power converter is input, and the DC water electrolytic power generated by boosting or stepping down the fluctuating power is used as the water electrolysis. The second power converter that outputs to the device and
A third power conversion device that inputs smoothing power obtained by subtracting the variable power from the generated power that has been boosted or stepped down by the first power conversion device, converts the smoothing power into alternating current, and outputs the transmitted power. And with
The second power conversion device is a power supply system characterized in that the input variable power is controlled so that the water electrolysis power does not exceed the generated power. 前記第２電力変換装置は、前記平滑化電力または前記送電電力の目標値を算出し、前記平滑化電力または前記送電電力の電力値が前記目標値に近づくように、入力される前記変動電力を制御することを特徴とする請求項１に記載の電源システム。 The second power conversion device calculates a target value of the smoothed power or the transmitted power, and inputs the variable power so that the power value of the smoothed power or the transmitted power approaches the target value. The power supply system according to claim 1, wherein the power supply system is controlled. 前記第２電力変換装置は、前記発電電力の電力値の移動平均を算出し、前記移動平均から所定のバイアス値を差し引いて前記目標値を算出することを特徴とする請求項２に記載の電源システム。 The power supply according to claim 2, wherein the second power conversion device calculates a moving average of the power values of the generated power, and subtracts a predetermined bias value from the moving average to calculate the target value. system. 前記第２電力変換装置は、前記発電電力の増減に応じて前記水電解電力を増減させることで、前記第１電力変換装置と前記第２電力変換装置および前記第３電力変換装置とを相互に接続する直流バスの電圧を一定に保つ制御を行うことを特徴とする請求項１〜３のいずれか一項に記載の電源システム。 The second power conversion device mutually increases or decreases the water electrolytic power according to the increase or decrease of the generated power, thereby causing the first power conversion device, the second power conversion device, and the third power conversion device to interact with each other. The power supply system according to any one of claims 1 to 3, wherein the power supply system is controlled to keep the voltage of the connected DC bus constant. 発電装置の発電電力に基づいて生成した水電解電力を水電解装置に供給し、前記発電電力から前記水電解電力を差し引いた送電電力を商用電力系統に送電する電源システムにおいて用いられる電源装置であって、
前記発電電力が入力され、前記発電電力を昇圧または降圧して直流を出力する第１電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力の変動成分に相当する直流の変動電力が入力され、前記変動電力を昇圧または降圧して生成した直流の前記水電解電力を前記水電解装置に出力する第２電力変換装置と、
前記第１電力変換装置で昇圧または降圧された前記発電電力から前記変動電力を差し引いた平滑化電力が入力され、前記平滑化電力を交流に変換して前記送電電力を出力する第３電力変換装置と、を備え、
前記第２電力変換装置は、前記水電解電力が前記発電電力を超えないように、入力される前記変動電力を制御することを特徴とする電源装置。 It is a power supply device used in a power supply system that supplies the water electrolysis power generated based on the power generated by the power generation device to the water electrolysis device and transmits the transmission power obtained by subtracting the water electrolysis power from the generated power to the commercial power system. hand,
A first power converter that receives the generated power and boosts or lowers the generated power to output direct current.
A DC fluctuating power corresponding to a fluctuating component of the generated power that has been boosted or stepped down by the first power converter is input, and the DC water electrolytic power generated by boosting or stepping down the fluctuating power is used as the water electrolysis. The second power converter that outputs to the device and
A third power conversion device that inputs smoothing power obtained by subtracting the variable power from the generated power that has been boosted or stepped down by the first power conversion device, converts the smoothing power into alternating current, and outputs the transmitted power. And with
The second power conversion device is a power supply device characterized in that the input variable power is controlled so that the water electrolysis power does not exceed the generated power.
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JP2007249341A (en) * 2006-03-14 2007-09-27 Hitachi Ltd Hydrogen production system
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