WO2023247122A1

WO2023247122A1 - Method for operating a hydrogen production system

Info

Publication number: WO2023247122A1
Application number: PCT/EP2023/063707
Authority: WO
Inventors: Sebastian Heuer; Kai SCHENK
Original assignee: RWE Technology International GmbH
Priority date: 2022-06-23
Filing date: 2023-05-23
Publication date: 2023-12-28
Also published as: DE102022115685A1

Abstract

The application relates to a method for operating a hydrogen production system (100) with at least one electrolysis plant (124), more particularly for controlling the electrolysis plant (124), comprising determining the amount of hydrogen to be dispensed by the electrolysis plant (124) in a first time period, determining the electrical energy needed by the electrolysis plant (124) to produce the determined amount of hydrogen in the first time period, obtaining a regenerative energy generator forecast for the first time period, wherein the regenerative energy generator forecast comprises at least one energy estimate value of the regenerative electrical energy that can be provided during the first time period by at least one wind park (118) that can be connected to the electrolysis plant (124) and/or at least one photovoltaic park (120) that can be connected to the electrolysis plant (124), obtaining at least one electrical fill level indication from at least one electrical energy store (122) that can be connected to the electrolysis plant (124), creating a control curve for the first time period, based on the determined required electrical energy, the estimated providable regenerative energy and the energy that can be provided by the electrical energy store and controlling the electrolysis plant (124) during the first time period in accordance with the created control curve.

Description

Method for operating a hydrogen production system

The application relates to a method for operating a hydrogen production system with at least one electrolysis system, in particular for controlling the electrolysis system. In addition, the application relates to a control device, a hydrogen production system and a computer program.

Hydrogen, especially hydrogen gas, is increasingly being used as an energy source these days. Hydrogen can be produced from water through electrolysis. During electrolysis, a redox reaction is forced using electrical energy or power, thereby generating hydrogen.

The hydrogen generated or produced can then be stored in suitable storage systems, for example. Alternatively, the hydrogen can also be converted into methane and the methane can then be stored. For example, the stored hydrogen (or methane) can be converted into electrical energy, for example using a hydrogen fuel cell (also known as reverse electrolysis) or by combustion in a gas power plant. It is understood that the hydrogen and/or methane produced can also be used for other chemical processes.

In the prior art, electrolysis systems are usually operated with electrical power from a (public) electrical network, in particular the 50 Hz network. In particular, it is common practice in the prior art to operate an electrolysis system with a uniform (preferably high) load using mains power from the interconnected network. The electrolysis system is regulated depending on the hydrogen consumption or demand. However, the disadvantage of hydrogen production systems that are supplied with electrical energy by a conventional interconnected network is that hydrogen production produces carbon dioxide (CO2) emissions. The reason for this is that energy producers that are based on fossil energy sources (in particular coal, natural gas, petroleum, etc.) also feed electrical energy into the electrical network.

However, in order to reduce the generation of carbon dioxide (CO2) in times of climate change, one goal is to increasingly use so-called renewable energy sources as the energy source(s) to supply the at least one electrolysis system of the hydrogen production system. A renewable or regenerative energy source is understood to mean, in particular, an energy source that is practically inexhaustible and/or regenerates relatively quickly.

The most important renewable energies include wind energy and solar energy. A wind turbine can convert the kinetic energy of the wind into electrical energy. With so-called solar energy, the energy of solar radiation, i.e. the corresponding electromagnetic radiation, can be converted into electrical energy by a photovoltaic system.

The problem with wind energy and solar energy is that they are each volatile energy sources. This means in particular that a wind turbine or a photovoltaic system can only deliver electrical energy directly depending on the current meteorological conditions at the installation site of the wind turbine or the photovoltaic system. The renewable electrical energy that can be provided by a wind turbine depends directly on the wind conditions (in particular wind speed and wind direction). In a photovoltaic system, the renewable electrical energy that can be provided by the photovoltaic system depends in particular on meteorological parameters, such as the position of the sun and/or the degree of coverage of the sky. Pilot-scale hydrogen production systems with a maximum power consumption of less than 50 MW are known from the prior art. However, such systems are not suitable for large-scale use.

Consequently, the hydrogen production systems described above are used, which are supplied with electrical energy from the network and are regulated depending on the amount of hydrogen purchased. This means that the current regulation of the electrolysis system of the hydrogen production system only takes place depending on the specified amount of hydrogen to be released.

The disadvantage of such hydrogen production systems is that there is currently no possibility of at least increasing the proportion of electrical renewable energy that is provided by at least one renewable energy source and consumed by an electrolysis system of a large-scale (in particular > 100 MW) hydrogen production system, without that an expansion of wind farms and/or photovoltaic parks must be carried out for this purpose. In particular, the use of non-renewable energy is still required.

The present application is therefore based on the object of creating a possibility which makes it possible to increase, in particular to maximize (or to reduce the proportion of non-renewable energy).

According to a first aspect of the application, the task is solved by a method for operating a hydrogen production system with at least one electrolysis system, in particular for controlling the electrolysis system. The procedure includes: Determining the amount of hydrogen to be released by the electrolysis system in a first period of time,

Determining the electrical energy required by the electrolysis system to produce the specific amount of hydrogen in the first period, obtaining a renewable energy generator forecast for the first period, wherein the renewable energy generator forecast contains at least one energy estimate of the wind farm that can be connected to the electrolysis system and / or at least one with the Electrolysis system connectable photovoltaic park includes renewable electrical energy that can be provided during the first period, obtaining at least one electrical level indication from at least one electrical energy storage device that can be connected to the electrolysis system, and

Creating a control curve for the first period of time, based on the determined electrical energy required, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage, and

Control the electrolysis system during the first period according to the control curve created.

In contrast to the prior art, a control method is provided according to the application in which the electrolysis system is regulated not only as a function of the amount of hydrogen to be produced, but also as a function of the available renewable electrical energy that comes from a wind farm and/or photovoltaic park and/or an electrical energy storage can be provided, in a particularly large-scale (in particular > 100 MW] hydrogen production system, it is possible to increase, in particular to maximize, the proportion of electrical energy or power from renewable energy sources. In particular, the control method according to the application allows the production of so so-called green hydrogen or hydrogen produced without CO2. The method is used to operate a hydrogen production system, in particular at least one electrolysis system of the hydrogen production system. In particular, the energy supply or power supply to the electrolysis system can be regulated by the method according to the application. In particular, it can be specified how much energy from which energy source (from at least two energy sources) the electrolysis system is supplied with energy.

An electrolysis system can include or be formed from a plurality of devices that work with electrical energy. The electrolysis system can include at least one electrolyzer or electrolyzer stack, for example a proton exchange membrane (PEM) electrolyzer. It is understood that alternatively or additionally the at least one electrolyzer may be a different type, such as a high-temperature electrolyzer or the like. An electrolysis system can preferably comprise a plurality of electrolyzer stacks or electrolyzer modules.

An electrolysis plant may (in a conventional manner) comprise at least one further device, such as a water treatment device, a compressor device, etc.

According to the application, the amount of hydrogen to be released by the electrolysis system in a first period of time is first determined. The first period is a future (predeterminable) period. The first period can be between 15 minutes and 1 week, for example. The first period can also be divided into a plurality of first sub-periods. As will be described, the first period can be immediately followed by a second period, which in turn can be immediately followed by a third period, etc. The amount of hydrogen to be delivered in the first period means in particular the amount of hydrogen that must be delivered to at least one further entity, such as a customer's further processing plant (e.g. chemical plant, gas network, etc.), in the first period. Determining the amount of hydrogen to be dispensed may include receiving a request with a desired amount of hydrogen. If there are a number of requests, the total (total) amount of hydrogen to be delivered during the first period can be determined from the individual desired amounts of hydrogen.

Furthermore, according to the application, the electrical energy required by the electrolysis system (i.e. in particular the plurality of devices in the electrolysis system) is determined in order to determine the specific amount of hydrogen in the first period of time. Determining the energy requirement can be based in particular on the known electrical performance data of the electrolysis system or the individual devices of the electrolysis system and the specific amount of hydrogen. This makes it possible to know how much electrical energy is required to produce a specified amount of hydrogen. Based on this, the electrical energy required for the specific amount of hydrogen can be determined, in particular calculated.

In order to increase the proportion of electrical energy that is based on renewable energy sources, it is proposed according to the application that a renewable energy generator forecast is received or provided at least for the first period. The at least one energy producer forecast contains at least one energy estimate of the renewable electrical energy that can (probably) be deliverable in the first period.

An energy estimate also includes, in particular, a current estimate and/or a power estimate. The regenerative electrical energy can be supplied in particular by a wind farm that can be electrically connected to the electrolysis system and/or a photovoltaic park that can be electrically connected to the electrolysis system. available. It is understood that two or more wind farms and/or two or more photovoltaic parks can be provided.

A wind farm has at least one wind turbine, set up to convert the kinetic energy of the wind into electrical energy (which is referred to here in particular as regenerative electrical energy). A photovoltaic park has at least one photovoltaic system, set up to convert solar energy or the corresponding electromagnetic radiation into electrical energy (which is referred to here in particular as regenerative electrical energy). For example, the renewable energy producer forecast can be provided by the at least one wind farm and/or photovoltaic park. By providing a renewable energy generator forecast, the operation of the at least one electrolysis system can be adapted to the (probably) available renewable electrical energy.

According to one embodiment, the hydrogen production system may include the at least one wind farm and/or the at least one photovoltaic park.

Furthermore, according to a further embodiment, the hydrogen production system may comprise at least one electrical energy storage device. For example, a rechargeable battery can be provided as an electrical energy storage device. It goes without saying that a plurality of electrical energy storage devices can be provided.

In particular, an electrical level indication can be provided for controlling the electrolysis system. The electrical fill level information indicates in particular how much electrical energy the at least one electrical energy storage device can provide (maximum) in the first period of time. The electrical level can be determined in particular by an electrical level sensor (in particular a charge level sensor) can be measured and provided as an electrical level indication.

Preferably, the electrical energy storage can only be rechargeable with renewable energy, which can be provided, for example, by the at least one wind farm and/or the at least one photovoltaic park.

According to the application, a (time-dependent) control curve is created for the first period of time to regulate the electrolysis system. A time-dependent control curve includes, in particular, (electrical) setpoints to be set by the electrolysis system or the respective devices of the electrolysis system. In addition to electrical setpoints, other process engineering setpoints can also be provided (e.g. a setpoint volume flow of hydrogen or the like). Furthermore, a control curve created specifies in particular the energy source from which the electrical energy with which the electrolysis system is controlled or supplied is supplied. The (time-dependent) control curve is created, at least based on the specific electrical energy required, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage. As will be described, the creation of the control curve can be based on at least one further parameter. In particular, the creation of the control curve can be based on the provided or specific data and a predetermined control algorithm. A control algorithm specifies in particular the rules according to which a control curve is to be created.

According to the application, a control curve can in particular comprise or be formed from a plurality of sub-control curves. In particular, a sub-control curve can be created for at least a plurality of (preferably each) electrically operating devices of the electrolysis system. As will be described, a control curve can be used as a sub- Control curve also includes a charging curve and/or hydrogen storage curve (explained in more detail below).

In particular, a control or target curve can be created for the first period of time to supply the electrolysis system. The control curve ensures in particular that in the first period the electrolysis system is supplied with the specific required electrical energy and that the energy is (if possible) renewable energy, as stated.

According to the application, the electrolysis system is then controlled during the first period of time in accordance with the control curve created. This means in particular supplying the electrolysis system with electrical energy (or current or power) in accordance with the control curve created, i.e. in particular depending on the specific electrical energy required, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage. In particular, regulation according to the application includes providing the control curve of the electrolysis system in such a way that the at least one controller of the electrolysis system regulates the at least one component of the electrolysis system in accordance with the control curve.

It is understood that the control curve can be adjusted at least if necessary. For example, if the renewable energy generator forecast changes or the required electrical energy changes, this can be detected. The created control curve can then be adjusted or recreated based on the at least one changed value.

If, for example, it is determined during the first period of time that the electrolysis system cannot be supplied with renewable electrical energy from the at least one wind farm and / or the at least one photovoltaic park in accordance with the control curve created, because, for example, there is a difference between the estimated energy value and the energy that can actually be provided If a discrepancy occurs, the missing electrical energy can preferably be provided from the electrical energy storage.

It is understood that in variants of registration, if necessary (e.g. if there is not enough renewable electrical energy available and/or more electrical energy is required at short notice than was previously determined), the electrolysis system can also be supplied from a network. In even further variants, an additional amount of hydrogen can also be provided by another hydrogen provider and/or hydrogen production system if necessary.

According to a further embodiment of the method according to the application, creating the control curve (for the first period of time) can further include:

Comparing the specific required electrical energy with the at least one energy estimate of the regenerative electrical energy that can be provided, whereby, if the energy estimate of the energy that can be provided is greater than or equal to the specific required electrical energy, a control curve is created which determines that the electrolysis system only operates with the available energy regenerative electrical energy is supplied, and wherein, if the energy estimate of the regenerative energy that can be provided is smaller than the specific required electrical energy, a control curve is created which determines that the electrolysis system is supplied with the regenerative electrical energy that can be provided and that in the at least one electrical energy storage stored electrical energy is supplied.

In other words, a control algorithm (already described) can specify that supplying the electrolysis system with renewable energy, which is supplied by a wind farm and/or a photovoltaic park, is prioritized. In particular, it can first be checked whether the estimated renewable electrical energy that can be provided is (alone) sufficient to supply the electrolysis system with the specific energy required. For this purpose, in particular, the estimated energy value can be compared with the specific required electrical energy (or value).

If it is determined in the comparison that the estimated energy value of the regenerative electrical energy that can be provided is greater than or equal to the specific required electrical energy, the electrolysis system can only be supplied with the regenerative electrical energy that can be provided. In particular, a control curve can be created which determines that only the energy provided by the wind farm and/or photovoltaic park is used to supply the electrolysis system during the first period of time. As has been described, if the energy estimate is incorrect, the energy can also be fed in from another source (e.g. energy storage and/or interconnected network) if necessary.

If it is determined in the comparison that the energy estimate of the energy that can be provided is smaller than the specific required electrical energy, the electrolysis system can be supplied with the regenerative electrical energy that can be provided and additionally with the electrical energy stored in the energy storage. In particular, a control curve can be created which determines that the energy provided by the wind farm and/or photovoltaic park and additionally the energy provided by the energy storage device are used to supply the electrolysis system with electrical energy during the first period of time.

In particular, a control algorithm (here too) can specify that initially all of the energy that can be supplied by the wind farm and/or photovoltaic park is used to operate the electrolysis system and only the energy that is then still missing is supplied by the electrical energy storage. As described If the energy estimate is incorrect, the energy can also be fed in from another source (e.g. energy storage and/or interconnected network) if necessary.

According to a further embodiment of the method according to the application, the method can further comprise:

Comparing the specific required electrical energy with the at least one energy estimate of the regenerative electrical energy that can be provided, wherein, if the energy estimate of the regenerative energy that can be provided is greater than the specific required electrical energy (and the at least one electrical level is below a specific level), a control curve is created, which specifies that the electrolysis system is only supplied with the regenerative electrical energy that can be provided and the at least one electrical energy storage is charged with at least a surplus part of the regenerative electrical energy that can be provided.

In other words, a control algorithm (already described) can specify (here too) that supplying the electrolysis system with renewable energy, which is supplied by a wind farm and/or a photovoltaic park, is prioritized.

The above-described comparison operation can also be carried out in this embodiment. If it is determined in the comparison that the estimated energy value of the energy that can be provided is greater than the specific required electrical energy, the additionally deliverable electrical energy can be used to charge the at least one electrical energy storage device. In particular, in this embodiment, a control curve can be created which determines that only the energy provided by the wind farm and/or photovoltaic park is used to supply the electrolysis system during the first period of time. The energy that can also be supplied by the wind farm and/or photovoltaic park can (if the filling level or charge state of the electrical energy storage permits this) be used at least partially to charge the energy storage device. In particular, a corresponding charging curve can be created. The charging curve can be part of the control curve. The electrical energy storage can be charged according to the charging curve.

Advantageously, the electrical energy storage can be charged with renewable energy if more energy is provided (or generated) by the wind farm and/or photovoltaic park than is required by the electrolysis system in the first period. The stored renewable energy can then be consumed by the electrolysis system if less energy is provided (or generated) by the wind farm and/or photovoltaic park than is required by the electrolysis system, for example in a second period following the first period.

According to a further preferred embodiment of the method according to the application, the method can further comprise:

Comparing the specific required electrical energy with the at least one estimated energy value of the regenerative electrical energy that can be provided, whereby, if the estimated energy value of the regenerative energy that can be provided is greater than the specific required electrical energy, a control curve is created which determines that the electrolysis system with the regenerative energy that can be provided Electrical energy is supplied, which is greater than the specific required electrical energy, such that at least one hydrogen storage device that can be connected to the electrolysis system is filled with an excess part of the hydrogen produced. In particular, it can happen that the electrolysis system is capable of producing more hydrogen in the first period of time than the amount of hydrogen to be released for the first period of time. Furthermore, the hydrogen production system can preferably comprise at least one hydrogen storage or can at least be connectable to a hydrogen storage.

In this embodiment, more hydrogen can be produced (if the filling level of the hydrogen storage allows this) than is to be delivered by the electrolysis system (e.g. to a customer) and this excess hydrogen can be stored in the hydrogen storage.

The above-described comparison operation can also be carried out in this embodiment. In particular, only if it is determined in the comparison that the estimated energy value of the energy that can be provided is greater than the specific required electrical energy can the additionally deliverable electrical energy be used at least partially in addition to operating the electrolysis system, in particular to produce additional hydrogen. In particular, in this embodiment, a control curve can be created which determines that the energy provided by the wind farm and/or photovoltaic park is used to supply the electrolysis system during the first period of time. Furthermore, in particular, a corresponding hydrogen storage curve can be created. The hydrogen storage can be filled with hydrogen according to the hydrogen storage curve. The hydrogen storage curve can be part of the control curve.

If the hydrogen production system includes at least one hydrogen storage and at least one electrical energy storage, the at least one control algorithm can specify whether excess electrical regenerative energy is used to charge the electrical energy storage and/or to fill the hydrogen storage. This can particularly depend on the filling levels depend on the memory mentioned. In particular, respective fill level limit values can be defined in the control algorithm.

Obtaining at least one fill level information from at least one hydrogen storage device that can be connected to the electrolysis system,

Comparing the specific required electrical energy with the at least one energy estimate of the regenerative electrical energy that can be provided, whereby if the specific required electrical energy is greater than the estimated energy value of the regenerative energy that can be provided and the at least one electrical fill level information (or the one stored in accordance with the fill level information and thus in particular available electrical energy), a control curve is created which determines that the electrolysis system is supplied with the regenerative electrical energy that can be provided and the electrical energy stored in the at least one electrical energy storage device and a difference amount of hydrogen between the amount of hydrogen that can be produced by the electrolysis system and the specific amount of hydrogen to be released Amount of hydrogen is provided by the hydrogen storage.

In particular, only if it is determined that the energy that can be delivered by the wind farm and / or photovoltaic park and the energy stored in the electrical energy storage are not together sufficient to supply the electrolysis system with the specific required electrical energy, can a difference in hydrogen between the the electrolysis system (with the amount of hydrogen that can be produced from the electrical energy storage and from the wind farm and / or photovoltaic park) and the specific amount of hydrogen to be released are provided by the hydrogen storage. In this case too, only regeneratively produced (or green) Hydrogen is released. In particular, a corresponding control curve can also be created in this embodiment.

Advantageously, the hydrogen storage can be filled using the renewable electrical energy if more electrical energy is provided (or generated) by the wind farm and/or photovoltaic park than is required by the electrolysis system in the first period. The amount of hydrogen then stored can then be released from the hydrogen storage when less energy is provided (or generated) by the wind farm and/or photovoltaic park and in particular by the electrical energy than is required by the electrolysis system, for example in a second period of time can follow the first period.

In addition, according to a further embodiment of the method according to the application, the at least one energy estimate of the renewable energy that can be provided can be based on at least one weather forecast for the installation site of the at least one wind farm and/or at least one weather forecast for the installation site of the at least one photovoltaic park for the first period of time. In particular, obtaining an energy estimate may include determining the at least one energy estimate based on the at least one weather forecast and at least one performance date of the at least one wind farm and/or at least one performance date of the at least one photovoltaic park. At least if a performance date changes (for example due to a failure of a wind turbine and/or photovoltaic system), or if the at least one weather forecast has changed, a new determination of the at least one estimated value can be carried out. Preferably, the at least one estimated value can be updated regularly.

A weather forecast can contain at least one estimated meteorological parameter, such as (average) wind speed, (average) Wind direction, position of the sun, (average) degree of sky coverage, (average) solar radiation, etc.

According to a further embodiment of the method according to the application, creating the control curve for the first period of time can further include:

Distributing the specific required electrical energy over the time-dependent control curve for the first period of time, the course of the time-dependent control curve being based on at least one ramp-up time of the electrolysis system and / or at least one ramp-down time of the electrolysis system (and in particular the set operating point at time t = 0 of the first period of time ).

In particular, it has been recognized that an electrolysis plant (particularly on a large scale) cannot be regulated as quickly as desired, i.e. with ramps as steep as desired. At least one ramp-up time of the electrolysis system and/or at least one ramp-down time of the electrolysis system can limit the control speed.

A ramp-up time means, in particular, a period of time that is required to bring an electrolysis system (or even just an electrically operated device of the electrolysis system) from a first operating point (e.g. a certain first power, etc.) to a second operating point that is higher than the first operating point (e.g. to promote a certain second, higher achievement, etc.). In particular, a ramp-up time also includes a switch-on time of a device. The switch-on time means in particular the time that is required to move a device (e.g. an electrolyzer stack) from a switched-off state to the operational state (without causing damage or critical system states).

A run-down time means, in particular, a period of time that is required to bring an electrolysis system (or even just a device of the electrolysis system) from a first operating point (e.g. a specific first output, etc.) to a second one To promote a lower operating point compared to the first operating point (e.g. a certain second, lower output, etc.). In particular, a shutdown time also includes a switch-off time of a device. The switch-off time means in particular the time that is required to move a device (e.g. an electrolyzer stack) from a switched-on, operational state to the switched-off state (without causing damage or critical system states).

According to a particularly preferred embodiment of the method according to the application, the at least one energy estimate of the renewable energy that can be provided can be a time-dependent energy estimate profile for the first time period. In other words, a large number of time-dependent energy estimates for the first time period can be provided as a time-dependent energy estimation profile. As has already been described, a time-dependent energy estimation profile can be determined for the first period of time, based on at least one weather forecast for the respective location of the respective wind farm and/or photovoltaic park.

Distributing the determined electrical energy to the time-dependent control curve can preferably be based on the time-dependent energy estimation profile. This makes it possible in particular to take into account the fluctuations in the generation of electrical energy by a wind farm and/or a photovoltaic park when controlling the electrolysis system, in particular in addition to the ramp-up and shutdown times described. A control curve can be created that takes into account both the technical control limits of the electrolysis system and the fluctuations in the provision of renewable energy.

For example, if a calm wind is forecast for a second period of time and/or for the end of the first period of time, the electrolysis system can first be ramped up to maximum power and then shut down in a timely manner without having to rely on energy from the interconnected network.

By creating a corresponding control curve or control line, the proportion of electrical energy or power from renewable energy sources can be increased even further.

Obtaining a further renewable energy producer forecast for a second period following the first period, wherein the further renewable energy producer forecast contains at least one further energy estimate (preferably a further time-dependent energy estimate profile) of the wind farm that can be connected to the electrolysis system and/or at least one that can be connected to the electrolysis system Photovoltaic park comprises regenerative electrical energy that can be provided during the second period, distributing the specific required electrical energy on the time-dependent control curve of the first period of time on the at least one further energy estimate (preferably on the at least one further energy estimate profile) of the regenerative electrical energy that can be provided during the second period based.

By taking into account at least one further renewable energy producer forecast for a second period following the first period when creating the control curve for the first period, the regulation of the electrolysis system can be particularly well adapted to the fluctuations of the volatile energy sources, i.e. the wind farm and/or the Photovoltaic park, can be adapted. In particular, an energy producer forecast becomes more accurate the closer it is to the current point in time. According to a preferred embodiment of the method according to the application, the distribution of the specific required electrical energy to the time-dependent control curve of the first period of time can also be based on the at least one electrical fill level indication of the at least one electrical energy storage device and/or at least one fill level indication of at least one hydrogen storage device which can be connected to the electrolysis system.

As has already been described, the creation of the control curve for the first period of time can be based on the respective fill level of the storage tanks mentioned. In particular, fluctuations in the provision of renewable electrical energy that are greater than the ramp-up and/or ramp-down times of the electrolysis system can be compensated for by energy from the electrical storage. Alternatively or additionally, for example, the electrolysis system can be shut down in a timely manner and a missing amount of hydrogen can be provided by the hydrogen storage.

According to a further embodiment of the method according to the application, the method can further comprise

Receiving a hydrogen production request to produce a further amount of hydrogen to be delivered during the first period (and/or second period),

Determining the further electrical energy required by the electrolysis system to produce the further amount of hydrogen to be released in the first period of time, producing at least a part of the further amount of hydrogen to be released, based on the specific additional electrical energy required, the estimated energy value of the regenerative electrical energy that can be provided and the electrical energy obtained Fill level information. In particular, at least a portion of the additional amount of hydrogen to be released is only produced if the electrical energy required for production can be provided or covered by the wind farm and/or the photovoltaic park. Preferably, the control curve can be adjusted as described.

If a further request for the production of an additional amount of hydrogen is received, before accepting this request it can be checked whether the additional amount of hydrogen can be produced by the electrolysis system without energy being provided by the network.

In particular, the additional energy required for the production of the additional amount of hydrogen by the electrolysis system can first be determined in the manner described above. It can then be determined in the manner previously described (in particular by comparing) whether this additionally required energy can be provided by the wind farm and/or the photovoltaic park. Optionally, it can be determined whether the additional energy can be at least partially supplied by the at least one electrical storage and/or the additional amount of hydrogen can be at least partially provided by the hydrogen storage.

If this is not the case, i.e. if the additional energy required cannot be provided by the wind farm and/or the photovoltaic park and in particular not by the electrical energy storage or the additional amount of hydrogen by the hydrogen storage, then the additional amount of hydrogen can be produced by the electrolysis system should not be used. The request can be rejected.

If it is determined that the additional energy can be provided by the wind farm and/or the photovoltaic park or optionally or additionally by the energy storage or the additional amount of hydrogen can be provided by the hydrogen storage, then the additional amount of hydrogen can be produced by the electrolysis system. In particular, at least the control curve for the first period can be adjusted accordingly. Optionally, a charging curve and/or a storage curve can be adjusted for the first period.

It goes without saying that it can first be checked whether the basic capacity of the electrolysis system even allows additional production of the requested amount of hydrogen. If this is not the case, the requested amount of hydrogen will not be produced.

As has already been described, the electrolysis system can comprise a plurality of electrolyzer stacks or electrolysis modules. According to a further embodiment of the method according to the application, the method can further comprise:

Obtaining a respective state of the plurality of electrolyzer stacks, and controlling the respective electrolyzer stack based on the determined respective state and the determined required electrical energy.

Obtaining a respective state can in particular include determining the respective state of the plurality of electrolyzer stacks. Determining the respective state can in particular include determining the respective activation period of the respective electrolyzer stack. The activation period means the period of time in which the respective electrolyzer stack was activated or operated in the past. Additionally, determining may include detecting damage and/or failures (e.g. due to (current or expected) maintenance and/or repair) of an electrolyzer stack. Controlling the respective electrolyzer stack can preferably include at least activating and/or deactivating an electrolyzer stack. In particular, the control can include a specification of the load distribution among the electrolyzer stacks. This can be specified for local control of the electrolyzer stacks. Based on this specification, the local control can control the electrolyzer stacks. Additionally, driving may include setting the supply current between a maximum permissible supply current and a minimum permissible supply current. This can be shown in particular in the control curve for the first period of time. In other words, the creation of the control curve for the first period of time can in particular also be based on the respective state of the respective electrolyzer stacks.

For example, the at least one control algorithm can specify that the electrolyzer stacks are loaded as evenly as possible. This can, for example, lead to a first electrolyzer stack, which has a longer activation period than a second electrolyzer stack, being shut down or deactivated in a prioritized manner.

A further aspect of the application is a control device of a hydrogen production system with at least one electrolysis system, wherein the control device is in particular set up to carry out the method described above. The control device comprises at least a first determination module, set up to determine the amount of hydrogen to be released by the electrolysis system in a first period of time. The control device comprises at least a second determination module, set up to determine the electrical energy required by the electrolysis system to produce the specific amount of hydrogen in the first period of time. The control device comprises at least a first receiving module, set up to receive a renewable energy producer forecast for the first period, wherein the renewable energy producer forecast includes at least one energy estimate of the wind farm that can be connected to the electrolysis system and/or at least one The photovoltaic park that can be connected to the electrolysis system includes renewable electrical energy that can be provided during the first period. The control device comprises at least one second receiving module set up to receive at least one electrical fill level indication from at least one electrical energy storage device that can be connected to the electrolysis system. The control device comprises at least one control module, set up to create a control curve for the first period of time, based on the specific required electrical energy, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage (and in particular based on a previously described control algorithm). The control module is set up to control the electrolysis system during the first period of time according to the control curve created.

Another aspect of the application is a hydrogen production system. The hydrogen production system includes at least one electrolysis system. The hydrogen production system includes at least one previously described control device.

According to a preferred embodiment of the hydrogen production system according to the application, the hydrogen production system can comprise at least one (previously described) electrical energy storage device. Alternatively or additionally, the hydrogen production system can comprise at least one (previously described) hydrogen storage.

According to a further embodiment of the hydrogen production system according to the application, the hydrogen production system can be an offshore hydrogen production system. The at least one wind farm can be an offshore wind farm and/or the at least one photovoltaic park can be an offshore photovoltaic park. Yet another aspect of the application is a computer program comprising instructions which, when the program is executed by a computer (eg in the form of a programmable logic controller), cause it to carry out the method described above.

The computer program, in particular the commands or program instructions, can be stored in a computer program product, in particular a program memory. For example, program memory is a non-volatile memory such as flash memory, magnetic memory, EEPROM memory (electronically erasable programmable read-only memory), and/or optical memory.

In addition, a computer in which, for example, the control device is implemented, may have a main memory, for example a volatile or non-volatile memory, in particular a random access memory (RAM), such as a static RAM memory (SRAM), a dynamic RAM memory (DRAM), a ferroelectric RAM memory (FeRAM) and/or a magnetic RAM memory (MRAM). The processor of the user terminal can, for example, store intermediate results or the like in the main memory.

A previously described module, element, etc. can at least partially comprise hardware elements (e.g. processor, storage means, etc.) and/or at least partially software elements (e.g. executable code). It should also be noted that terms such as “first”; “Second” etc. only indicate an order if this is explicitly described, and otherwise only serve to distinguish two elements. Furthermore, it is understood that two or more modules (e.g. first and second determination modules, first and second reception modules, etc.) can be implemented in one module.

The features of the processes, control devices, hydrogen production systems and computer programs can be freely combined with one another. In particular can Features of the description and/or the dependent claims, even if they completely or partially circumvent features of the independent claims, can be independently inventive on their own or freely combined with one another.

There are now a variety of possibilities for designing and further developing the method according to the application, the control device according to the application, the hydrogen production system according to the application and the computer program or product according to the application. On the one hand, reference is made to the patent claims subordinate to the independent patent claims, and on the other hand to the description of exemplary embodiments in conjunction with the drawing. In the drawing shows:

1 shows a schematic view of an exemplary embodiment of a hydrogen production system according to the present application with an exemplary embodiment of a control device according to the present application, and

Fig. 2 is a diagram of an exemplary embodiment of a method for operating a hydrogen production system, in particular for controlling an electrolysis system of the hydrogen production system, according to the present application.

Figure 1 shows a schematic view of an exemplary embodiment of a hydrogen production system 100 according to the present application with an exemplary embodiment of a control device 102 according to the present application.

The hydrogen production system 100 includes at least the control device 102 and at least one electrolysis system 124, which can be controlled in particular by the control device 102. Preferably, the hydrogen production system 100 may include at least one electrical energy storage 122 (e.g. a rechargeable battery) and/or at least one hydrogen storage 134. It goes without saying that two or more electrical energy storage devices and/or two or more hydrogen storage devices can be provided. The hydrogen storage 134 can be connected to the electrolysis system 124 via a fluid connection 142, in particular for filling the hydrogen storage 134. Hydrogen can be delivered from the hydrogen storage 134 to a hydrogen outlet 136 via a further fluid connection 144. Hydrogen can also be delivered from the electrolysis system 124 to the hydrogen outlet 136 via a further fluid connection 146.

Furthermore, the electrolysis system 124 can be electrically connected to at least one wind farm 118 and/or to at least one photovoltaic park 120, in particular (indirectly) via a network. In particular, island operation, in which, for example, the wind farm is directly connected to the electrolysis system 124, is not being considered. Optionally, the hydrogen production system 100 may include the at least one wind farm 118 and/or the at least one photovoltaic park 120.

In particular, an electrical supply network 140 is provided for an electrical connection. It is understood that additional components may be connected to the electrical supply network 140 if necessary. For example, an electrical consumer of the hydrogen storage 134 can also be connectable to the electrical supply network 140.

Furthermore, at least one (wireless and/or wired) communication network 138 may be provided to enable communication between the various elements shown. It goes without saying that further components can be connected to the at least one communication network 138. For example, a communication connection between wind farm 118 and photovoltaic park 120 can also be provided to enable forecasting. The hydrogen output 136 can also be connected, for example to “talk” about the hydrogen required or the hydrogen to be supplied.

The electrolysis system 102 can include at least one electrical connection 126 and at least one communication module 128. As has already been described, an electrolysis system 102 can comprise or be formed by a large number of devices/modules. At least one water treatment device 130 and a large number of electrolyzer stacks 132.1 to 132.n are shown here as examples. It goes without saying that further devices can be provided, such as hydrogen processing (e.g. cleaning, compression, etc.) or the like.

In particular, for detecting the respective state of the respective electrolyzer stacks 132.1 to 132. n, the electrolysis system 102 can comprise at least one sensor arrangement 154.

The electrical energy storage 122 may include an electrical connection 148, a communication connection 150 and in particular at least one fill level sensor (in particular a charge state sensor) 152 for measuring the electrical energy stored in the electrical energy storage 122.

In addition to a hydrogen tank, the hydrogen storage 134 can include a hydrogen input 156, a hydrogen output 158 and a communication module 160. Optionally, a fill level sensor 162 can be provided, set up to detect and in particular provide the amount of hydrogen stored in the hydrogen storage 134.

The control device 102 can in particular be formed by at least one computer (preferably a programmable logic controller (PLC)) or be implemented in a computer. The control device 102 shown comprises at least a first determination module 104 set up to determine the in Amount of hydrogen to be delivered or produced by the electrolysis system 124 (to the hydrogen output 136 of the hydrogen production system 100) in a first period of time.

The control device 102 includes at least a second determination module 106, set up to determine the electrical energy required by the electrolysis system 124 to produce the specific amount of hydrogen in the first period of time.

The control device 102 includes at least a first receiving module 108, set up to receive a renewable energy producer forecast for the first period. The regenerative energy producer forecast includes at least one energy estimate, preferably a time-dependent energy estimate profile or a time-dependent energy estimate curve, of the regenerative electrical energy that can be provided during the first period by at least one wind farm 118 that can be connected to the electrolysis system 124 and/or at least one photovoltaic park 120 that can be connected to the electrolysis system 124.

The control device 102 comprises at least a second receiving module 110, set up to receive at least one electrical level indication from the at least one electrical energy storage device 122 that can be connected to the electrolysis system 124. Optionally, the second receiving module 110 can be set up to receive at least one level indication from the at least one connected to the electrolysis system 124 connectable hydrogen storage 134.

The control device 102 includes at least one control module 112, set up to create a control curve for the first period of time based on the determined required electrical energy, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage. The control module 112 is set up to control the electrolysis system 124 during the first period of time according to the control curve created. This means in particular one Controlling the supply of electrical energy to the electrolysis system 124 during the first period of time according to the control curve created.

In addition, the control device 102 can include at least one data memory 114. In particular, data that can be used by other modules (e.g. 104, 106 and 112) can be stored in the data memory 114.

For example, performance data of the electrolysis system 124 can be stored in the data memory 114. At least one control algorithm can also be stored in the data memory 114.

A control algorithm specifies in particular the rules according to which a control curve is to be created by the control module 112.

The first reception module and/or second reception module can/can be formed, for example, by a (common) bidirectional communication module of the control device 102.

The operation of a hydrogen production system 100 is described in more detail by way of example with the aid of FIG. Figure 2 shows a diagram of an exemplary embodiment of a method for operating a hydrogen production system 100, in particular for controlling an electrolysis system 124 of the hydrogen production system 100, according to the present application.

In a first step 201, the amount of hydrogen to be released by the electrolysis system 124 in a first period of time is determined, in particular by the first determination module 104. In particular, the amount of hydrogen to be released can be determined, in particular calculated, based on at least one request for producing a specific or desired amount of hydrogen in a first period of time. In step 202, a determination is made, in particular by the second determination module 106, of the electrical energy required by the electrolysis system 124 to produce the specific amount of hydrogen in the first period of time. In particular, the second determination module 106 can access the (electrical) performance data of the electrolysis system 124 stored in the data memory 114 and use the performance data of the electrolysis system 124 and the specific amount of hydrogen to determine the electrical energy (or power) required for this in the first period of time.

In a step 203, a renewable energy generator forecast for the first period is obtained, in particular by the first reception module 108. The renewable energy producer forecast includes at least one energy estimate (preferably an energy estimate profile for the first time period) of the regenerative electrical energy that can be provided or delivered by the at least one wind farm 118 and/or the at least one photovoltaic park 120 during the first time period.

The at least one energy estimate is based in particular on the (stored) performance data of a wind farm 118 and a weather forecast (for example provided by a service provider) for the first period of time at the location of the wind farm 118 and/or on the (stored) performance data of a photovoltaic park 120 and a (for example (provided by a service provider) weather forecast for the first period at the location of the photovoltaic park 120.

In variants of the registration, further data can be used, such as historical energy generator forecasts and/or environmental information (e.g. obstacles that lead to shading or influence the wind speed) at the parks 118, 120 mentioned. In a step 204 (which can in particular be carried out at least partially in parallel to step 203), at least one electrical fill level indication from the at least one electrical energy store 122 is obtained, in particular by the second receiving module 110. In particular, the sensor 152 can detect the information in the electrical energy store 122 capture and provide stored electrical energy.

Optionally, in step 204, at least one fill level indication from the at least one electrical hydrogen storage 134 can be obtained, in particular by the second receiving module 110. In particular, the sensor 162 can detect and provide the amount of hydrogen stored in the hydrogen storage 134.

Furthermore, optionally, for example in step 204, a respective state of the plurality of electrolyzer stacks 132.1 to 132.n can be obtained, in particular by the second receiving module 110.

In step 205, a time-dependent control curve is created for the first period of time, based on the specific required electrical energy, the estimated renewable energy that can be provided and the energy that can be provided by the electrical energy storage. The creation of the time-dependent control curve can be based on the at least one control algorithm. The control algorithm can specify that the renewable energy of the wind turbine 118 and/or the photovoltaic system 120 is preferably used to supply the electrolysis system 124.

For example, the following can be specified in the control algorithm:

As has been described, in particular the specific required electrical energy can be compared with the at least one estimated energy value. If the energy estimate is greater than the specific electrical energy required, a control curve may be created specifying that only the renewable energy of the wind turbine 118 and/or the photovoltaic system 120 is used to power the electrolysis system 124 during the first period of time.

In particular, ramp-up and/or shutdown times of the electrolysis system 124 can be taken into account in the control algorithm. In addition, the respective maximum fill level of the respective memories 122, 134 can also be taken into account in the control algorithm.

If there are fluctuations with slopes in the time-dependent energy estimation profile for the first period of time that cannot be regulated (without causing damage) due to the ramp-up and/or shutdown times of the electrolysis system 124, the missing electrical energy can be supplied, particularly briefly, by the electrical energy storage 122 are provided. It is also conceivable to shut down the electrolysis system 124 early and compensate for the missing amount of hydrogen with the amount of hydrogen stored in the hydrogen storage 134.

Should additional renewable energy be available, it can be used to charge the electrical energy storage 122 and/or to produce additional hydrogen, which can then be stored in the hydrogen storage 134. Whether the electrical energy storage is charged with the additionally available renewable energy and/or the hydrogen storage 134 is filled indirectly can depend on the respective fill levels of the respective storage 122, 134. This can also be defined in the control algorithm.

If the estimated energy value is smaller, a control curve can be created in which it is determined that the missing electrical energy is provided by the electrical Energy storage 122 is provided or the missing amount of hydrogen is provided by the hydrogen storage 134.

In addition, a load control can be implemented in the control algorithm in order to distribute the load on the various devices, in particular the electrolyzer stacks 132.1 to 132.n, as evenly as possible.

Alternatively, the load can also be distributed in such a way that all electrolyzer stacks 132.1 to 132.n have a uniform state of degradation (wear). In particular, the control of the respective electrolyzer stack 132.1 to 132. n can be based on the specific respective state and the specific required electrical energy, as already described. This can be shown in particular in the first control curve.

As has already been described, if necessary, the electrolysis system 124 can be supplied with electrical energy from conventional power plants, not shown, through the interconnected network.

In step 206, at least the electrolysis system 124 is controlled, in particular by the control module 112, according to the control curve created. At least supplying the electrolysis system 124 with electrical energy can be carried out in accordance with the control curve created. In particular, electrolysis system 124, electrical storage 122 and hydrogen storage 134 can be operated or controlled according to the control curve, as described.

Preferably, a control curve can be adjusted (and, for example, at least some of steps 201 to 205 can be carried out again). For example, individual or all steps can be carried out iteratively. Individual steps can also be carried out in parallel and/or omitted. An adjustment can be made in particular if an input parameter (e.g. estimated energy value, state of an electrolysis stack, etc.) of the control algorithm has changed. Furthermore, in variants it can be provided that steps 201 to 205 are carried out for a plurality of time periods (first, second, etc.). In particular, a provisional control curve can first be created for, for example, a second period that follows the first period, since the energy producer forecast for the second period still contains uncertainties. The provisionally created control curve for the second period can then be adjusted, particularly during the first period.

The present topics are based in particular on a holistic approach to the operation of an electrolysis system (for hydrogen production). Here, in particular, a new type of controller or control device is used to holistically, intelligently and proactively control not only the electrolyzer stack(s), but also the entire electrolysis system or hydrogen production system as well as possible storage devices (electricity and/or hydrogen and/or water vapor storage in high-temperature electrolyzers). to control or regulate. In particular, the distribution of the available electrical power and the distribution of the hydrogen produced between the respective producers and customers are optimally coordinated in order to guarantee the most economical operation possible, taking into account the process engineering constraints. The present items also take into account future variables that are subject to uncertainty, such as the electricity supply.

A holistic and forward-looking approach to operating an entire hydrogen production system and storage not only increases the efficiency of hydrogen production, but there is also the potential to increase the degree of utilization (full-load hour equivalents of the system and the storage) as well as a potential for reducing wear and tear Degradation of the electrolysis cells as well as rapid load changes in compressors, containers and pipes. This makes (at least almost) C02-free hydrogen more economically competitive than conventional hydrogen. Reference symbol list

100 hydrogen production system

102 Control device, electrolysis system

104 first determination module

106 second determination module

108 first receiving module

110 second receiving module

112 control module

114 data storage

118 wind farm

120 photovoltaic park

122 electrical energy storage

124 electrolysis plant

126 electrical connection

128 communication module

130 water treatment device

132 electrolyzer stack

134 hydrogen storage

136 hydrogen output

138 communication network

140 electrical supply network

142 fluid connection

144 fluid connection

146 fluid connection

148 electrical connection

150 communication port

152 sensor

154 sensor arrangement

156 hydrogen input Hydrogen output communication module sensor

Claims

P a t e n t a n s p r ü c h e Method for operating a hydrogen production system (100) with at least one electrolysis system (124), in particular for controlling the electrolysis system (124), comprising:

Determining the amount of hydrogen to be released by the electrolysis system (124) in a first period of time,

Determining the electrical energy required by the electrolysis system (124) to produce the specific amount of hydrogen in the first period,

Obtaining a regenerative energy producer forecast for the first period, wherein the regenerative energy producer forecast contains at least one estimated energy value of the at least one wind farm (118) that can be connected to the electrolysis system (124) and/or at least one photovoltaic park (120) that can be connected to the electrolysis system (124) during the first Renewable electrical energy that can be provided over a period of time, obtaining at least one electrical level indication from at least one electrical energy storage device (122) that can be connected to the electrolysis system (124),

Control the electrolysis system (124) during the first period of time according to the control curve created. Method according to claim 1, characterized in that creating the control curve comprises: Comparing the specific required electrical energy with the at least one energy estimate of the regenerative electrical energy that can be provided, whereby, if the energy estimate of the energy that can be provided is greater than or equal to the specific required electrical energy, a control curve is created which determines that the electrolysis system (124) only is supplied with the regenerative electrical energy that can be provided, and wherein, if the estimated energy value of the regenerative energy that can be provided is smaller than the specific required electrical energy, a control curve is created which determines that the electrolysis system (124) is supplied with the regenerative electrical energy that can be provided and the Electrical energy stored in the at least one electrical energy storage (122) is supplied.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

Comparing the specific required electrical energy with the at least one estimated energy value of the regenerative electrical energy that can be provided, whereby, if the estimated energy value of the regenerative energy that can be provided is greater than the specific required electrical energy, a control curve is created which determines that the electrolysis system (124) only is supplied with the regenerative electrical energy that can be provided and the at least one electrical energy storage (122) is charged with at least an excess part of the regenerative electrical energy that can be provided.

4. Method according to one of the preceding claims, characterized in that the method further comprises: Comparing the specific required electrical energy with the at least one estimated energy value of the regenerative electrical energy that can be provided, whereby, if the estimated energy value of the regenerative energy that can be provided is greater than the specific required electrical energy, a control curve is created which determines that the electrolysis system (124) with is supplied with the regenerative electrical energy that can be provided, which is greater than the specific required electrical energy, in such a way that at least one hydrogen storage (134) that can be connected to the electrolysis system (124) is filled with an excess part of the hydrogen produced.

5. Method according to one of the preceding claims, characterized in that the method further comprises:

Obtaining at least one fill level information from at least one hydrogen storage device (134) that can be connected to the electrolysis system (124), comparing the specific required electrical energy with the at least one estimated energy value of the regenerative electrical energy that can be provided, whereby if the specific required electrical energy is greater than the estimated energy value of the regenerative energy that can be provided and for which at least one electrical level indication, a control curve is created, which determines that the electrolysis system (124) is supplied with the regenerative electrical energy that can be provided and the electrical energy stored in the at least one electrical energy storage (122) and a difference amount of hydrogen between the amount of hydrogen that can be produced by the electrolysis system (124) and the specific amount of hydrogen to be released by the hydrogen storage (134).

6. Method according to one of the preceding claims, characterized in that the at least one energy estimate of the renewable energy that can be provided is based on at least one weather forecast for the installation site of the at least one wind farm (118) and/or at least one weather forecast for the installation site of the at least one photovoltaic park (120) for the first period of time.

7. The method according to any one of the preceding claims, characterized in that creating the control curve for the first period of time comprises: distributing the specific required electrical energy to the time-dependent control curve for the first period of time, the course of the time-dependent control curve being based on at least one ramp-up time of the Electrolysis system (124) and/or at least one shutdown time of the electrolysis system (124).

8. The method according to claim 7, characterized in that the at least one energy estimate of the renewable energy that can be provided is a time-dependent energy estimate profile for the first time period, and wherein the distribution of the determined electrical energy to the time-dependent control curve is based on the time-dependent energy estimate profile.

9. The method according to claim 7 or 8, characterized in that the method further comprises:

Obtaining a further renewable energy producer forecast for a second period following the first period, wherein the further renewable energy producer forecast contains at least one further energy estimate of the wind farm (118) which can be connected to the electrolysis system (124) and/or at least one to the electrolysis system (124 ) connectable photovoltaic park (120) includes renewable electrical energy that can be provided during the second period, distributing the specific required electrical energy to the time-dependent control curve of the first period on the at least one further energy estimate of the renewable electrical energy that can be provided during the second period.

10. The method according to one of the preceding claims 7 to 9, characterized in that the distribution of the specific required electrical energy to the time-dependent control curve of the first time period is further based on: the at least one electrical fill level indication of the at least one electrical energy storage, and / or at least one Fill level information of at least one hydrogen storage device (134) that can be connected to the electrolysis system (124).

11. The method according to any one of the preceding claims, characterized in that the method further comprises:

Receiving a hydrogen production request to produce a further amount of hydrogen to be delivered during the first period,

Determining the additional electrical energy required by the electrolysis system (124) to produce the additional amount of hydrogen to be released in the first period, and

Adjusting the control curve created for the first period of time, based on the additional electrical energy required, the estimated energy value of the regenerative electrical energy that can be provided and the electrical fill level information obtained.

12. The method according to any one of the preceding claims, characterized in that the electrolysis system (124) has a plurality of electrolyzer stacks (132.1,

132.2. 132.n) and the procedure further includes:

Obtaining a respective state of the plurality of electrolyzer stacks (132.1,

132.2. 132.n), and Controlling the respective electrolyzer stack (132.1, 132.2, 132.n), based on the specific respective state and the specific electrical energy required.

13. Control device (102) of a hydrogen production system (100) with at least one electrolysis system (124), wherein the control device (102) is in particular set up to carry out the method according to one of the preceding claims 1 to 11, comprising: at least one first determination module (104) set up to determine the amount of hydrogen to be released by the electrolysis system (124) in a first period of time, at least one second determination module (106) set up to determine the electrical energy required by the electrolysis system (124) to produce the specific amount of hydrogen in the first period of time, at least a first Receiving module (108) set up to receive a renewable energy producer forecast for the first period, the renewable energy producer forecast containing at least one energy estimate of the wind farm (118) which can be connected to the electrolysis system (124) and/or at least one photovoltaic park which can be connected to the electrolysis system (124). (120) comprises renewable electrical energy that can be provided during the first period, at least one second receiving module (110) set up to receive at least one electrical fill level indication from at least one electrical energy storage device (122) that can be connected to the electrolysis system (124), and at least one control module (112) set up to create a control curve for the first period of time, based on the specific required electrical energy, the estimated regenerative energy that can be provided and the energy that can be provided by the electrical energy storage, the control module (112) being set up to control the electrolysis system (124) during the first Duration according to the control curve created.

14. Hydrogen production system (100), comprising at least one electrolysis system (124), and at least one control device (102) according to claim 12. 15. Hydrogen production system (100) according to claim 13, characterized in that the hydrogen production system (100) has at least one electrical energy storage ( 122), and/or - the hydrogen production system (100) comprises at least one hydrogen storage

(134).

16. Computer program, comprising commands which, when the program is executed by a computer, cause it to carry out the method according to one of the preceding claims 1 to 12.