DE102020002276A1 - Power generation system and method for speed control of a drive unit in a power supply system - Google Patents

Abstract

The invention, which relates to a power generation plant (1) and a method for regulating the speed of a drive unit in a power generation plant (1), is based on the object of specifying a solution whereby a network frequency-dependent control of the speed of a generator (3) coupled to the drive unit is applied to a specified target speed is reached. This object is achieved in terms of the arrangement in that the drive unit is a speed-controlled hydrogen motor (2) with operating gas circulation. In terms of the method, the object is achieved in that a speed-controlled hydrogen engine (2) with operating gas circulation that drives the electric generator (3) is provided as the drive unit, and that a change in an operating gas that is supplied to the hydrogen engine (2) with operating gas circulation for regulation to the specified target speed. Oxygen-hydrogen mixture takes place.

Description

The invention relates to a power generation plant which has an electric generator and a drive unit for driving the electric generator.

The invention also relates to a method for regulating the speed of a drive unit in a power supply system, which is provided with an electric generator for generating electricity and in which an actual speed of the electric generator or the drive unit is determined and in which the actual speed is regulated to a predetermined value Target speed takes place.

Power generation systems are known, for example for the decentralized generation of electrical energy, in various sizes or with various electrical powers. Such power generation systems comprise at least one drive unit and an electrical generator driven by the drive unit, in which the mechanical energy supplied by the drive unit is converted into electrical energy and output by the generator. This delivery of electrical energy is usually carried out to an energy transmission network, which is also referred to as a power supply network, or to directly connected electrical consumers.

So-called conventional internal combustion engines or internal combustion engines, which are operated, for example, with gasoline, diesel fuel or gas fuel, usually work as drive units in such power generation systems. A major disadvantage of such internal combustion engines is that the combustion of, for example, a fuel-air mixture in the combustion chamber or a combustion chamber of an internal combustion engine produces pollutants such as nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO) and others and releases them into the environment are emitted or emitted. In addition, the climate-damaging exhaust gas carbon dioxide (CO2), which is classified as particularly problematic, is emitted.

This known state of the art thus has considerable disadvantages for the environment and health.

So-called exhaust emission-free, high-efficiency motors are also known from the prior art.

This type of engine differs from known internal combustion engines in that these engines have a so-called circulation path. The circulation path is formed by connecting an exhaust passage of the high-efficiency engine through which exhaust gas generated after combustion flows and an intake passage of the high-efficiency engine through which a gas to be introduced into the combustion chamber flows.

In such high-efficiency engines, for example, hydrogen, which is used as fuel, and oxygen, which oxidizes the hydrogen, are supplied to the combustion chamber. In addition, argon, for example, which circulates as working gas or operating gas via the outlet channel and via the circulation path to the inlet channel, is returned to the combustion chamber. This is a closed circuit that realizes combustion without ambient air. By using argon as the working gas or operating gas, a better thermal efficiency is achieved compared to conventional internal combustion engines. In the following, such a high-efficiency motor with a circulation path is referred to as a hydrogen motor with operating gas circulation or with a circulating working medium or, for a shorter time, only as a hydrogen motor.

In such hydrogen engines with operating gas circulation, water is produced when hydrogen is burned. This water is condensed in a condenser provided in the circulation path and separated from the argon working gas. As a result, only the working gas is returned to the combustion chamber of the hydrogen engine via the circulation path.

From the WO2007 / 100115 Such a hydrogen engine is known, which is operated using a circulating working medium, wherein hydrogen, oxygen and the working medium consisting of a monatomic gas are supplied to a combustion chamber in order to burn the hydrogen, and wherein the working medium is contained in an exhaust gas, which in the combustion chamber is returned.

Lubricating oil, which is used to operate the engine, gets into the combustion chamber and inevitably leads to the formation of carbon dioxide in the combustion chamber, which thus gets into the circulation path of the engine and has a negative effect on the operation of the engine. Thus, the problem to be solved is to remove such contaminants.

As a solution, it is indicated that the hydrogen engine comprises a product removal means which is arranged in the circulation duct and which removes such unwanted impurities. In particular, any carbon dioxide produced in the combustion chamber is removed.

In power generation systems, a speed or target speed dependent on the network frequency and the number of generator poles must be set in order to establish synchronization between the power supply network and the generator driven by a drive unit. For the correct setting of the speed of a drive unit, such as a hydrogen motor, as well as a correct phase position, an exact speed control of the hydrogen motor is required.

From the EP 1929144 For example, there is known a closed-cycle operating gas circulation type internal combustion engine which burns hydrogen in a combustion chamber. A control method is also described in order to implement torque regulation in an internal combustion engine with a circulation path, which is preferably used in the automotive sector. According to this description, the amount of hydrogen, oxygen and the operating gas supplied should be so large that a torque is generated which corresponds to a required torque. This control method is suitable for use in a vehicle in which, for example, a vehicle driver specifies a required torque by actuating a corresponding pedal. A speed control is not provided and also not possible in this way.

The prior art thus far does not allow proper operation of an internal combustion engine with operating gas circulation such as a hydrogen engine as a drive unit in a power generation system with a synchronous generator, in which the speed must be regulated depending on the network frequency and number of generator poles.

On the basis of this prior art, there is a need for a speed control for a hydrogen engine as a drive unit in a power generation plant.

The object of the invention now consists in specifying a power generation plant and a method for regulating the speed of a drive unit in a power generating plant, with a network frequency-dependent regulation of the speed of a generator coupled to the drive unit to a predetermined target speed.

The object is achieved by a power generation plant with the features according to claim 1 of the independent claims. A further development is specified in a dependent claim.

The object is also achieved by a method for speed control with the features according to claim 3 of the independent claims. Further developments are given in the dependent claims.

It is envisaged that to generate the electrical current by a rotating electrical generator or synchronous generator in a power generation system, instead of a conventional internal combustion engine, a high-efficiency engine free of exhaust emissions, i.e. a hydrogen engine with operating gas circulation, is used.

In order to transfer a rotary movement generated by the hydrogen engine to the generator, both units are coupled by means of a connecting shaft.

With such a coupling, the speed of a crankshaft of the hydrogen engine is equal to the speed of the generator to be driven. Alternatives with a speed change or speed adjustment by means of a gearbox are possible, but will not be discussed further here.

The method according to the invention for regulating the speed of a drive unit such as a hydrogen engine with operating gas circulation in a power generation system solves the problem of speed control in that the amount of oxygen and / or hydrogen introduced or blown into the combustion chamber of the hydrogen engine with operating gas circulation is determined and regulated on the basis of a specified target speed will.

This target speed is determined depending on the required network frequency of the power supply network, i.e. depending on the frequency of the voltage to be generated to be provided by the synchronous generator of the power generation system, in order to achieve synchronism of the frequency of the voltage generated with the network frequency of the power supply network. This network frequency is in Europe, Asia, Australia and in other areas, for example 50 Hz. Depending on the design of the synchronous generator of the power generation system, the number of pairs of magnetic poles within a rotating electrical machine such as a synchronous generator can vary. On the basis of knowledge about the construction of the synchronous generator and the line frequency to be set, a person skilled in the art can determine the speed or the set speed required for the synchronous generator.

This provision is not part of the power generation plant presented here or the method for regulating the speed of a drive unit in a power generation plant and is therefore not continued. Assuming that a shaft of the hydrogen engine suitable for transmitting the torque to the synchronous generator is connected without a gearbox, for example directly to the shaft of the synchronous generator via a connecting shaft, the speeds of the shafts are the same. The speed control can thus be carried out on the shaft, such as, for example, a crankshaft, which delivers a torque from the hydrogen engine.

Provision is made for a measurement-based actual speed of the generator or the crankshaft to be compared with the specified target speed, with no change in the operating gas supplied to the hydrogen engine in the event that the actual speed and the target speed match Oxygen-hydrogen mixture takes place.

In the event that the actual speed is less than the target speed, the amount of oxygen and / or hydrogen supplied in the operating gas-oxygen-hydrogen mixture is increased. In the event that the actual speed is greater than the target speed, the amount of oxygen and / or hydrogen supplied in the operating gas-oxygen-hydrogen mixture is reduced. Thus, the speed of the crankshaft of the hydrogen engine is changed until the crankshaft has the target speed, the crankshaft transmitting its rotary motion, for example via a connecting shaft, to a shaft of the generator and driving it at the same speed.

It is also provided that a tolerance range for the target speed to be achieved is formed with a lower speed limit N _u and an upper speed limit N _o . The formation of such a tolerance range allows slight deviations from the specified target speed without a control intervention, that is, without changing the dosage of the amounts of oxygen and / or hydrogen in the operating gas-oxygen-hydrogen mixture.

It is also provided that the amount of oxygen and / or hydrogen supplied in the operating gas-oxygen-hydrogen mixture is changed only in the event that the actual speed is outside the tolerance range formed. If the actual speed is within the tolerance range established, the hydrogen engine operates at a speed which is sufficient to meet the standard of a required network frequency of 50 Hz, for example, and there is no need to intervene in the ongoing operation of the hydrogen engine.

Provision is made for the comparison of the actual speed with the target speed to be carried out continuously in order to achieve continuous operation of the power supply system with the required network frequency.

Here, the comparison of the actual speed with the target speed can take place at defined times or be repeated within defined time units.

It is also provided that the comparison of the actual speed with the target speed only takes place in the event that the hydrogen engine is in an operating phase. In the event that the hydrogen engine is in a resting phase, the method according to the invention for speed control is interrupted.

The method according to the invention is also interrupted in the event that the hydrogen engine is to be switched off.

Provision is made for the speed control to regulate a setpoint speed of, for example, 1500 1 / min, so that a network frequency of 50 Hz is achieved when using a correspondingly designed generator. With this network frequency, the energy generated by the generator of the power supply system is fed into the power supply network. In an alternative, the energy generated by the generator of the power supply system can be made available directly to connected electrical consumers.

• 1: eine Prinzipdarstellung der erfindungsgemäßen Stromerzeugungsanlage und
• 2: eine Prinzipdarstellung des erfindungsgemäßen Verfahrens zur Drehzahlregelung.

The previously explained features and advantages of this invention can be better understood and assessed after careful study of the following detailed description of the preferred, non-limiting example embodiments of the invention with the accompanying drawings, which show:

• 1 : a schematic diagram of the power generation plant according to the invention and
• 2 : a schematic representation of the method according to the invention for speed control.

the 1 shows a schematic diagram of the power generation plant according to the invention 1 .

The hydrogen engine 2 with operating gas circulation as an internal combustion engine, the conversion of chemical energy supplied, in the form of an operating gas-oxygen-hydrogen mixture, into released mechanical energy, while an electrical generator 3 or a synchronous generator converts this mechanical energy into a desired electrical energy, which is generated by the generator 3 via electrical lines 4th for example in a power supply network 5 is delivered. For this purpose is the hydrogen engine 2 via a connecting shaft 6th for the transmission of a torque 7th with the generator 3 tied together. In the example of the 1 is a three-phase power supply network 5 shown.

By the hydrogen engine 2 an operating gas-oxygen mixture, which has, for example, argon as the operating gas, via the respective operating gas supply device 8th through one in the combustion chamber 9 of the hydrogen engine 2 downward moving piston sucked. Such a downward movement is characterized in that the piston is in the combustion chamber 9 moved from its so-called top dead center to its so-called bottom dead center, regardless of the exact alignment or installation position of the combustion chamber 9 or one of the combustion chamber 9 surrounding cylinder in the hydrogen engine 2 .

Shortly after the piston has reached bottom dead center, the piston moves again in the direction of top dead center, with the operating gas-oxygen mixture in the combustion chamber as a result of this movement of the piston 9 is compressed. This compression is made possible by the fact that the respective operating gas supply device 8th and the respective outlet device 12th are closed.

Provision is made for hydrogen to enter the combustion chamber at a correspondingly high pressure at the same time as the compression process 9 via a hydrogen supply device 10 is dosed. The compressed operating gas-oxygen-hydrogen mixture that is produced in this way is released by a spark plug shortly before the piston reaches top dead center 11 in the combustion chamber 9 ignited and thus initiated the combustion process of the operating gas-oxygen-hydrogen mixture. This combustion generates heat, whereby the operating gas, which has a higher specific heat ratio than oxygen or air, expands and thus sets the piston in a downward movement in the direction of the bottom dead center of the piston. In an alternative version of a hydrogen engine 2 with operating gas circulation can be used instead of a spark plug 11 a glow plug can be used.

The crankshaft of the hydrogen engine 2 which as usual by means of a connecting rod or a connecting rod with the pistons of the hydrogen engine 2 is connected, is at least indirectly to the connecting shaft 6th tied together. The crankshaft, the connecting rods and the pistons are shown in the schematic diagram in 1 not shown. Via the connecting shaft 6th that is what the hydrogen engine will do 2 generated torque 7th or a rotary movement to the generator 3 transfer. In particular, through the movement of the piston in the direction of bottom dead center during the combustion of the operating gas-oxygen-hydrogen mixture, the resulting mechanical energy is transferred to the crankshaft, which is set in rotation.

After the piston has reached bottom dead center, the piston is driven by the inertia of the rotating parts of the hydrogen engine 2 moved again in the direction of top dead center, with the exhaust gas resulting from the combustion via the respective outlet device 12th from the combustion chamber 9 of the hydrogen engine 2 is expelled. This exhaust gas mainly comprises the operating gas and the water vapor produced during combustion.

The water vapor produced by the combustion and the heated operating gas then circulate via the operating gas circulation path 13th up to the operating gas supply devices 8th to the combustion chamber 9 and the working cycle of the hydrogen engine 2 starts all over again.

Even if the present description refers by way of example to a hydrogen engine with operating gas circulation according to the four-stroke Otto process, a hydrogen engine with operating gas circulation according to the two-stroke Otto process can also be used instead, the speed of which can be used with the inventive method for speed control a drive unit in a power supply system. Further alternatives are a hydrogen engine with operating gas circulation based on the four-stroke diesel method, a hydrogen engine with operating gas circulation based on the two-stroke diesel method, or a hydrogen engine with operating gas circulation in a version as a rotary piston engine or Wankel engine.

When the process gas is circulated within the process gas circulation path 13th the operating gas or the circulating working medium also passes through at least one operating gas cooler 14th , which is used to separate water from the process gas in the process gas circulation path 13th is arranged. The condensate produced when water is separated from the operating gas passes through a condensate line 15th into a suitable condensate collecting container 16 .

In the event of a leak or when the operating gas circulation path is refilled 13th becomes new operating gas from the operating gas supply facility 17th via the operating gas supply line 18th and the corresponding first valve 19th into the process gas circulation path 13th fed.

The electric generator 3 is designed, for example, so that a speed of 1500 1 / min corresponds to the typical network frequency of the power supply network of 50 Hz and thus represents the target speed to be achieved. It is pointed out at this point that, of course, a different generator design (number of pole pairs) or a different network frequency results in different speeds.

So the hydrogen engine 2 can generate a speed corresponding to the target speed with operating gas circulation, hydrogen must be supplied from a hydrogen supply device 20th via a hydrogen supply line 21 into the combustion chambers in an amount that is required to generate the target speed 9 are supplied and burned in these. The amount of hydrogen in the respective combustion chamber 9 is burned, is by the inventive method for speed control of a hydrogen engine 2 in a power generation plant 1 controlled.

For this purpose, it is provided that either the amount of the respective combustion chamber 9 supplied hydrogen or the amount of the respective combustion chamber 9 supplied oxygen controlled and the amount of each other is regulated so that a sufficient amount of the reactants in the respective combustion chamber 9 is present in order to connect them to one another by a combustion. In an alternative embodiment, both the amount of the respective combustion chamber 9 supplied hydrogen as well as the amount of the respective combustion chamber 9 supplied oxygen regulated according to the process.

In such a control loop, the specified setpoint speed of 1500 rpm, for example, is a reference variable and the actual speed of the crankshaft of the hydrogen engine 2 or the actual speed of the generator 3 a controlled variable. A control deviation or control difference thus results from a difference between the target speed and the actual speed. This control deviation, which can assume a positive or a negative value, is used to determine whether the amount of hydrogen and / or oxygen to be metered, for example, has to be increased, maintained or decreased in order to achieve the specified target speed.

In the event that the control deviation is zero, the setpoint speed and the actual speed match exactly and the amount of hydrogen and / or oxygen that has been dosed up to now is retained. In the event that the control deviation is positive, the target speed is greater than the actual speed. The amount of hydrogen and / or oxygen that has been dosed up to now must therefore be increased. In the event that the control deviation is negative, the target speed is lower than the actual speed. In this case, the previously metered amount of hydrogen and / or oxygen must be reduced.

Based on this concept, the amount of hydrogen and / or oxygen to be dosed is determined. The required amount of hydrogen is obtained from the hydrogen supply device 20th removed and via the hydrogen supply line 21 and the respective hydrogen supply device 10 in the respective combustion chamber 9 dosed. The required amount of oxygen is obtained from the oxygen supply device 22nd removed and via the oxygen supply line 23 and the second valve 24 into the process gas circulation path 13th dosed.

This means that the required amounts of hydrogen are in the combustion chamber 9 and of oxygen in the process gas circulation path 13th made available, the hydrogen engine achieves 2 or the generator 3 the target speed.

The one from the generator 3 Generated electrical power can be via the electrical lines 4th tapped and into the power supply network 5 be fed in frequency-synchronously and phase-synchronously.

As usual, synchronous AC voltage sources such as the electrical generator are interconnected 3 and the power grid 5 only after phase synchronization has taken place. Customary procedures or methods known from the prior art can be used for this. For this reason, the implementation of phase synchronization is not discussed in detail.

the 2 shows a schematic diagram of the method according to the invention for regulating the speed of a drive unit in a power generation plant. The flowchart shows the control of the hydrogen and / or oxygen supply as a function of the instantaneous speed or the actual speed N _{ist of} the hydrogen engine 2 with operating gas circulation.

In step 25th starts the method for regulating the speed of a drive unit, such as a hydrogen engine 2 , in a power generation plant 1 .

In a subsequent step 26th a condition check is carried out to determine whether the hydrogen engine is running 2 is in operation or in a so-called operating phase or whether the hydrogen engine is 2 not in operation or in a so-called resting phase. The status of the operating phase is exemplified by the Relationship MIB = 1 and the state of the resting phase represented by MIB = 0.

Is the hydrogen engine 2 in its resting phase, where MIB = 0, the method starts with step 32 continued or ended. At this point, the method can be ended or continued in a loop, the method then in step 26th can continue with a new health check, which is in the 2 is not shown. As usual, such methods can be processed in a recurring loop, with both the number of repetitions and their chronological sequence, such as a repetition rate or sampling rate, being able to be defined as required.

Is the hydrogen engine 2 in its operating phase, where MIB = 1, the method starts with step 27 continued. In this step 27 a test is carried out for an end sequence and it is determined whether an end sequence for ending the operating phase of the hydrogen engine is already carried out 2 has been triggered.

In the event that a current operating phase of the hydrogen engine 2 should be terminated and the hydrogen engine 2 is to be transferred to its resting phase, a speed control according to the method is no longer necessary and the method is in step 32 completed.

In the event that the current operating phase of the hydrogen engine 2 is to be continued with the speed control according to the method in step 28 continued.

In step 28 finds a speed comparison of the actual speed of the hydrogen engine 2 or the actual speed N _{ist of} the generator 3 with the predetermined target rotational speed N _{is to} take. For this test, for example, a tolerance range is defined in which the actual speed N _ist for proper operation of the generator 3 should be located. This tolerance range is formed by a lower speed limit N _u and an upper speed limit N _o . Thus applies to the proper operation of the hydrogen engine 2 or the generator 3 $${\text{N}}_{\text{u}}<{\text{N}}_{\text{is}}<{\text{N}}_{\text{O}}.$$

Used when checking the speed in step 28 determined that the actual speed N _is the target rotational speed N _will equal or that the actual speed N _is located in the specified tolerance range, which does not change to be metered amount of hydrogen and / or oxygen and the process of step 32 completed.

Used when checking the speed in step 28 determined that the actual rotational speed N _is not the target rotational speed N corresponds _to, is in the subsequent step 29 In a deviation check, it was determined whether the actual speed N act _is above the upper limit N _o or below the lower limit N _u .

If the actual speed N _ist above the upper limit N _o , the method in step 30th continued with a decrease in dosage and decreased the supply of hydrogen and / or oxygen.

If the actual speed N _{ist is} below the lower limit N _u , the method in step 31 continued with an increase in the dosage and the supply of hydrogen and / or oxygen is increased.

Alternatively, only the supply of hydrogen or only the supply of oxygen is reduced or increased according to the method. The corresponding associated dosage of the respective other substance can be carried out by means of a method that is independent of the method according to the invention. This method, which is independent of the method according to the invention, doses the respective other substance as a function of one for proper combustion in the combustion chamber 9 necessary mixing ratio.

The reduction in the crotch 30th as well as the increase in the crotch 31 is carried out, for example, in predetermined steps. For this purpose, values can be stored in a table. For example, such a change in the dosage of hydrogen and / or oxygen can take place in steps between 0.5% and 25%. In the event that the sampling rate is correspondingly low and thus the frequency of comparing the actual speed with the target speed is repeated in very small time segments, steps smaller than 0.5% are also possible.

In an alternative, the step 29 It is not only checked whether the actual speed N act _is outside the tolerance range, but what absolute deviation between the actual speed N _is and the required target speed N set _is currently occurring. This absolute deviation can be used to select possible steps for changing the dosage of hydrogen and / or oxygen. Thus, a larger step of changing the dosage of hydrogen and / or oxygen is chosen for the case that the absolute deviation between the actual rotational speed _N and the required target speed N _will be greater and vice versa.

The actual speed N act _is measured by means of a conventional method for speed measurement known from the prior art, which, for example, can also be implemented as a contactless method for speed measurement.

List of reference symbols

1

Power supply system

2

Hydrogen engine

3

generator

4th

electrical line

5

Power grid

6th

Connecting shaft

7th

Torque

8th

Operating gas supply device

9

Combustion chamber

10

Hydrogen supply device

11

Spark plug / glow plug

12th

Outlet device

13th

Operating gas circulation path for the circulating working medium

14th

Operating gas cooler

15th

Condensate line

16

Condensate collecting tank

17th

Operating gas supply device

18th

Operating gas supply line

19th

first valve

20th

Hydrogen supply device

21

Hydrogen supply line

22nd

Oxygen supply device

23

Oxygen supply line

24

second valve

25th

begin

26th

Health check

27

Examination of the end sequence

28

Speed comparison

29

Deviation check

30th

Decrease in dosage

31

Increasing the dosage

32

end

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2007/100115 [0010]
• EP 1929144 [0014]

Claims (10)

Power generation plant (1) which has an electric generator (3) and a drive unit for driving the electric generator (3), characterized in that the drive unit is a speed-controlled hydrogen engine (2) with operating gas circulation. Power generation plant (1) according to Claim 1 , characterized in that between the hydrogen engine (2) with operating gas circulation and the electric generator (3) a connecting shaft for transmitting a rotary movement generated by the hydrogen engine (2) with operating gas circulation to the electric generator (3) is arranged. Method for regulating the speed of a drive unit in a power supply system (1) which is provided with an electric generator (3) for generating electricity, in which an actual speed of the electric generator (3) or the drive unit is determined and in which a regulation of the actual Speed is carried out to a predetermined target speed, characterized in that a speed-controlled hydrogen motor (2) driving the electric generator (3) with operating gas circulation is provided and that for regulation to the predetermined target speed, a change in the hydrogen engine (2) takes place with operating gas circulation supplied operating gas-oxygen-hydrogen mixture. Procedure according to Claim 3 , characterized in that the actual speed is compared with the target speed, that in the event that the actual speed and the target speed match, there is no change in the operating gas-oxygen supplied to the hydrogen engine (2) with operating gas circulation Hydrogen mixture takes place that in the event that the actual speed is less than the target speed, the supplied amount of oxygen and / or hydrogen is increased and that in the event that the actual speed is greater than the target speed is, the amount of oxygen and / or hydrogen supplied is reduced. Procedure according to Claim 3 or 4th , characterized in that a tolerance range for the target speed is formed with a lower speed limit N _u and an upper speed limit N _o . Procedure according to Claim 5 , characterized in that only in the event that the actual speed is outside the tolerance range formed, a change in the amount of oxygen and / or hydrogen supplied takes place. Method according to one of the Claims 3 until 6th , characterized in that the comparison of the actual speed with the target speed takes place continuously in fixed time units. Method according to one of the Claims 3 until 7th , characterized in that the comparison of the actual speed with the target speed only takes place in the event that the hydrogen engine (2) with operating gas circulation is in an operating phase. Method according to one of the Claims 3 until 8th , characterized in that the target speed of the electric generator (3) is 1500 1 / min and that the electric generator (3) generates its electrical energy at this target speed with a mains frequency of 50 Hz. Method according to one of the Claims 3 until 9 , characterized in that the electrical energy generated by the electrical generator (3) is fed into a power supply network (5).

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