Isolated hybrid plant

Abstract

The invention relates to an electrical grid (1100), in particular for an isolated hybrid plant (1000), comprising: a first grid section (1110) which is set up: to be connected to at least one wind power installation, to be connected to at least one gas production plant, and to transport an electrical power produced by the wind power installation to the at least one gas production plant; a second grid section (1120) which is set up: to be connected to the at least one gas production plant; and a grid transformer or grid converter (1130) which electrically connects the first grid section (1110) and the second grid section (1120) to one another and is set up: to exchange electrical power bidirectionally between the first electrical grid section (1110) and the second electrical grid section (1120), wherein the first grid section (1110) has a first rated grid frequency (U1) and a first rated grid voltage (UN1) and can be operated at a first grid frequency (f1) and a first grid voltage (U1); and the second grid section (1120) has a second rated grid frequency (U2) and a second rated grid voltage (UN2) and can be operated at a second grid frequency (f2) and a second grid voltage (U2); and wherein the first grid section (1110) is designed for a first frequency range (Δf1) around the rated grid frequency (fN1) in which the first grid frequency (f1) moves; and the second grid section (1120) is designed for a second frequency range (Δf2) around the rated grid frequency (fN2) in which the second grid frequency (f2) moves; wherein the first frequency range (Δf1) is greater than the second frequency range (Δf2).

Description

[0001] Isolated hybrid power plant

[0002] The present invention relates to an electrical network for a hybrid power plant and to such a hybrid power plant.

[0003] Hybrid power plants or hybrid systems are a type of power plant that is used to generate electrical energy, fuel and / or heat from various primary energy sources.

[0004] A well-known example of such hybrid power plants or hybrid systems are the so-called wind-based power-to-gas plants (P2G for short), which produce gas from wind energy, for example.

[0005] The wind turbines first convert the kinetic energy of the wind, also known as wind power, into electrical energy. This electrical energy is then fed to electrolyzers to generate gas.

[0006] The gas thus obtained can then be fed into a gas grid via a pipeline, for example, or converted into another substance, such as methane or kerosene, through synthesis and then transported by ship. A particular disadvantage of wind-based power-to-gas plants is the inconsistent wind and the associated fluctuating electrical energy generation by the wind turbines.

[0007] The (sometimes severe) fluctuations in electrical power resulting from the inconsistency of the wind not only lead to fluctuating gas production but also to malfunctions within the gas generation plants. To counteract this, oversized electrical storage systems and complex control strategies are usually used, which are extremely costly.

[0008] The European Patent Office has searched the following prior art in the priority application for the present application: WO 201 1 / 060953 A2, CN 104 113 084 B and EP 3 032 684 AI.

[0009] The object of the present invention is therefore to address at least one of the above-mentioned problems. In particular, an electrical grid and / or a hybrid power plant is to be proposed that enables cost-optimized production of gas, liquid, fuel, or the like, preferably taking into account grid-related problems within a power-to-gas plant and / or at locations remote from the supply grid.

[0010] According to the invention, an electrical network is thus proposed, in particular for an isolated hybrid power plant, comprising a first network section configured to be connected to at least one wind turbine, to be connected to at least one gas generation plant, and to transport electrical power generated by the wind turbine to the at least one gas generation plant; a second network section configured to be connected to the at least one gas generation plant;and a grid converter that electrically connects the first grid section and the second grid section and is configured to bidirectionally exchange electrical power between the first electrical grid section and the second electrical grid section, wherein the first grid section has a first nominal grid frequency and a first nominal grid voltage and can be operated at a first grid frequency and a first grid voltage; and the second grid section has a second nominal grid frequency and a second nominal grid voltage and can be operated at a second grid frequency and a second grid voltage; and wherein the first grid section is designed for a first frequency range around the nominal grid frequency, within which the first grid frequency lies; and the second grid section is designed for a second frequency range around the nominal grid frequency, within which the second grid frequency lies;wherein the first frequency range is greater than the second frequency range;

[0011] In particular, an electrical grid for a hybrid power plant or hybrid system is proposed, which comprises two grid sections that are designed differently or can be operated differently. In particular, it is proposed that the electrical grid comprise a first grid section with a wide frequency range, where the actual power electronics for energy transport can be arranged, and a second grid section with a narrow frequency range, where voltage- and / or frequency-sensitive auxiliary equipment can be arranged, such as the control technology of the gas generation plants.

[0012] The first network section, which is responsible for the actual energy transport, therefore has a significantly more flexible network frequency than the second network section, which is responsible for supplying the voltage and / or frequency-sensitive auxiliary equipment of the gas generation plants.

[0013] In particular, an electrical grid for a hybrid power plant is proposed in which interventions in the first grid section are minimized. The first grid section, in particular, has a frequency range in which the grid frequency is essentially free-floating (free-floating system frequency).

[0014] Such a structure with two different network sections, which are connected to each other in particular via a network converter, provides an electrical network that is significantly more robust and cost-effective for individual hybrid power plants than previously known and used electrical networks, which usually have only one network section.

[0015] An electrical network is understood herein to mean, in particular, an electrical network for the transmission and distribution of electrical energy. The electrical network is preferably designed as an alternating current network, in particular a three-phase alternating current network, and has two, in particular different, network sections.

[0016] The first grid section is preferably designed as a three-phase AC voltage grid and / or is particularly configured to be connected to at least one wind turbine, for example, via a transformer. The first grid section is therefore particularly configured to aggregate electrical energy generated by a plurality of wind turbines. Furthermore, the first grid section is configured to be connected to at least one gas generation plant, for example, via another transformer and a rectifier.

[0017] Preferably, the first grid section is designed for power transport or energy transmission between wind turbines and gas generation plants. The first grid section is thus particularly designed and / or intended to transport the electrical power generated by the wind turbines to the gas generation plants so that they can convert the electrical power into gas.

[0018] Preferably, the first grid section is designed for a nominal power of at least 100 MW or greater. This also means, in particular, that the individual electrical equipment of the first grid section, such as transformers, cables, circuit breakers, and the like, are designed for correspondingly high currents.

[0019] The second network section is preferably designed as a three-phase alternating voltage network and / or is in particular designed to be connected to at least one, preferably voltage- and / or frequency-sensitive, auxiliary device of the gas generation plant, for example via a converter and / or a rectifier.

[0020] Preferably, the second network section is designed to supply power to auxiliary devices, in particular voltage and / or frequency-sensitive auxiliary devices of the gas generation plants.

[0021] Preferably, the second grid section is designed for a nominal power of up to 20 MW. This also means, in particular, that the individual electrical equipment of the second grid section, such as fuses, cables, and the like, is designed for correspondingly high currents.

[0022] The wind turbines are therefore, in particular, located or connected only to the first grid section and / or not to the second grid section. Preferably, the first grid section is designed to be significantly more powerful than the second grid section, for example, by a factor of between 10 and 100. The first grid section is therefore, in particular, designed for a higher rated power than the second grid section. For example, the rated power of all wind turbines of the individual hybrid power plant connected to the first grid section is approximately 200 MW or more, and the total power of all auxiliary equipment of the hybrid power plant connected to the second grid section is approximately 20 MW or less.

[0023] Both the first network section and the second network section each have a nominal network frequency. In particular, the first network section has a first nominal network frequency, and the second network section has a second nominal network frequency.

[0024] The nominal network frequency indicates in particular the frequency for which an electrical network or a network section is designed or the frequency at which the electrical network or network section should approximately or desirably be operated.

[0025] Preferably, the first nominal mains frequency and / or the second nominal mains frequency is substantially approximately 50 Hz or approximately 60 Hz.

[0026] In one embodiment, the first network section and the second network section have substantially the same nominal network frequency. For example, the first nominal network frequency is 50 Hz and the second nominal network frequency is also 50 Hz. In another embodiment, the first network section and the second network section have different nominal network frequencies. For example, the first nominal network frequency is 60 Hz and the second nominal network frequency is 50 Hz, or vice versa.

[0027] Both the first and second grid sections are each operated at a grid frequency. The grid frequency varies over time by the value of the nominal grid frequency. The grid frequency can also be referred to as the actual grid frequency or the operational grid frequency.

[0028] The grid frequency indicates in particular which frequency an electrical grid or a section of the grid has at a specific point in time.

[0029] According to one embodiment, it is now proposed that the grid frequency of the first grid section may fluctuate significantly more around the value of the first grid nominal frequency than the grid frequency of the second grid section may fluctuate around the value of the second grid nominal frequency.

[0030] Preferably, the first network section and the second network section each have a frequency range around the nominal network frequency, within which the network frequency can essentially move freely. The network sections are therefore designed and operated in such a way that any protective devices, such as circuit breakers, only trigger when the network frequency leaves the frequency range.

[0031] The frequency range of the first grid section is significantly larger than the frequency range of the second grid section. For example, the frequency range of the first grid section is 10 percent of the value of the first nominal grid frequency and the frequency range of the second grid section is 1 percent of the value of the second nominal grid frequency. In this case, the grid frequency of the first grid section can move freely between 47.5 Hz and 52.5 Hz, for example with a nominal grid frequency of 50 Hz, and the grid frequency of the second grid section can only move freely between 49.75 Hz and 50.25 Hz, for example with a nominal grid frequency of 50 Hz. Preferably, the grid frequency of the first grid section and / or the second grid section is only regulated, in particular actively, when the grid frequency leaves the frequency range, for example due to load connection and / or load shedding.

[0032] It is therefore also proposed, in particular, that the grid frequency within the first grid section and / or the second grid section be adjusted by means of a power control or power regulation system, in particular such that the grid frequency remains within the frequency range. Only when the grid frequency moves outside the frequency range is the power regulation of the grid section actively intervened, for example, by throttling the wind turbines and / or the gas generation plants.

[0033] Both the first network section and the second network section each have a nominal network voltage.

[0034] The nominal network voltage indicates in particular the voltage for which an electrical network or a network section is designed or the voltage at which the electrical network or network section should approximately or desirably be operated.

[0035] In particular, the first network section has a first nominal network voltage, and the second network section has a second nominal network voltage. Preferably, the first nominal network voltage and / or the second nominal network voltage is between 230 V and 20 kV. In one embodiment, the first network section and the second network section have substantially the same nominal network voltage. In a preferred embodiment, the first network section and the second network section have different nominal network voltages. In particular, the first nominal network voltage is greater than the second nominal network voltage.

[0036] Both the first network section and the second network section are each operated with a mains voltage.

[0037] The grid voltage varies over time by the value of the nominal grid voltage. The grid voltage can also be referred to as the actual grid voltage or the operative grid voltage. The grid voltage specifically indicates the voltage of an electrical grid or a section of the grid at a specific time.

[0038] According to one embodiment, it is now proposed that the mains voltage of the first network section may fluctuate significantly more around the value of the first nominal network voltage than the mains voltage of the second network section may fluctuate around the value of the second nominal network voltage.

[0039] The first network section and the second network section are further electrically connected to one another, in particular via a network converter, a network inverter or the like.

[0040] The grid converter or the grid inverter are therefore designed to electrically connect the first grid section to the second grid section in such a way that electrical power can be exchanged between the first grid section and the second grid section.

[0041] Preferably, the first network section and the second network section are connected to one another via a bidirectional network converter, in particular such that electrical power can be shifted from the first network section to the second network section and electrical power can be shifted from the second network section to the first network section, for example by means of a corresponding controller for the electrical network. The electrical network, i.e., the first network section and / or the second network section, can also be connected to and / or comprise further electrical components, such as electrical storage devices, transformers, or the like.

[0042] Preferably, the first network section has a first rated power and the second network section has a second rated power, wherein the first rated power is greater than the second rated power, in particular at least 5 times as great, preferably at least 10 times as great.

[0043] Since the first grid section is intended for power transmission between wind turbines and gas generation plants, the first grid section is designed significantly larger than the second. This particularly applies to the entire power electronics of each grid section. For example, the first grid section has a nominal capacity of 200 MW or more, while the second grid section has a nominal capacity of 20 MW or less.

[0044] Preferably, the first frequency range is equal to and / or less than 20 percent, preferably equal to and / or less than 10 percent, more preferably equal to and / or less than 5 percent, of the first nominal grid frequency and / or the second frequency range is equal to and / or less than 2 percent, preferably equal to and / or less than 1 percent, of the second nominal grid frequency.

[0045] The first frequency range and / or the second frequency range are thus preferably determined depending on the nominal network frequency of the respective network section.

[0046] For example, the nominal grid frequency of the first grid section is 50 Hz and the first frequency range of the first grid section is 20 percent of that, i.e. 10 Hz. The first grid frequency can then, for example, be in a frequency range between 40 Hz and 60. The second frequency range, i.e. the frequency range of the second grid section, is, however, chosen to be significantly narrower than the first frequency range, for example 0.2 Hz. The second grid frequency can then essentially move freely between 49.9 Hz and 50.1 Hz.

[0047] It is therefore also proposed in particular that the first network section is operated with a broad frequency range, preferably with a wider frequency range than usual, and / or that the second network frequency in the second network section may only move minimally around the second nominal network frequency, in particular in such a way that voltage- and / or frequency-sensitive means can also be connected to the second network section.

[0048] This ensures, in particular, that the voltage- and / or frequency-sensitive auxiliary devices can be reliably supplied by the second grid section. Various mechanisms can be implemented to maintain the grid frequency within the appropriate frequency ranges, such as specific schedules, statics, or the like. Preferably, at least one power control is used to maintain the grid frequency within the frequency range.

[0049] Preferably, the second network section is prepared to supply voltage and / or frequency-sensitive auxiliary equipment, in particular gas generation plants, with electrical power in a voltage and / or frequency-stable manner.

[0050] It is therefore proposed in particular to arrange the voltage- and / or frequency-sensitive auxiliary devices of the gas generation plants in a separate network section which is significantly more stable in terms of voltage and frequency. The second network section has, for example, corresponding means and / or connections for this purpose. The means are used in particular to keep the voltage and / or frequency stable in the second network section. The means can be, for example, a voltage detector, a frequency detector, a power controller, an electrical storage device or the like. The second network section preferably has at least one connection for oran electrical storage device which is designed to keep the grid frequency in the second grid section stable by means of an active power feed-in and / or active power withdrawal and / or to keep the voltage in the second grid voltage in the second grid section stable by means of a reactive power feed-in and / or reactive power withdrawal.

[0051] Preferably, the grid converter is configured to exchange electrical power between the first grid section and the second grid section, preferably bidirectionally.

[0052] For this purpose, the mains converter can be designed, for example, as a bidirectional frequency converter.

[0053] The grid converter is therefore particularly configured to shift electrical power from the first grid section to the second grid section and / or to shift electrical power from the second grid section to the first grid section. Preferably, the grid converter is configured to extract active and / or reactive electrical power from the first grid section and / or feed it into the first grid section and / or to extract active and / or reactive electrical power from the second grid section and / or feed it into the second grid section. The grid converter is therefore particularly configured to operate in 4-quadrant mode.

[0054] Alternatively or additionally, the grid converter is designed to form a grid former for the first grid section and / or the second grid section and / or to impress a voltage into the first grid section and / or the second grid section.

[0055] The grid converter is therefore preferably designed as a voltage-shaping converter, in particular an AC voltage-shaping converter, and is particularly configured to operate in a voltage-shaping manner or to inject a voltage into the first grid section and / or the second grid section. The grid converter can therefore be controlled in such a way that it behaves approximately like an ideal voltage source.

[0056] Network former or voltage-forming in relation to the grid converter means in particular that the grid converter is designed to:

[0057] 1) to impress a sinusoidal, in particular three-phase, alternating voltage, preferably with a predetermined frequency, into a network section, in particular largely independent of the load in the network section and / or

[0058] 2) to provide an instantaneous active and / or reactive power for a network section, which ensures that the network voltage and / or the network frequency is kept largely constant in the network section and / or

[0059] 3) to create a low-impedance sink for all disturbances in a network section and / or

[0060] 4) to provide a high short-circuit power for a network section.

[0061] Alternatively or additionally, the grid converter is configured to stabilize the grid voltage and / or the grid frequency in the first grid section and / or the second grid section. This can be achieved, for example, by the grid converter extracting and / or feeding active and / or reactive power from the first grid section and / or the second grid section.

[0062] The grid converter can also be configured by means of a control unit to form a STATCOM or a phase shifter with respect to the first grid section and / or the second grid section.

[0063] Alternatively or additionally, the grid converter is designed to provide a stable second grid frequency and / or a stable second grid voltage in the second grid section, in particular for voltage- and / or frequency-sensitive auxiliary devices.

[0064] For this purpose, the grid converter detects, for example, the second grid frequency and / or the second grid voltage and provides a corresponding active and / or reactive power in the second grid section, which leads to a stable grid frequency and / or a stable grid voltage in the second grid section. The grid converter is preferably configured to keep both the grid frequency and the grid voltage stable in the second grid section.

[0065] Alternatively or additionally, the grid converter is designed to inject a grid voltage into the second grid section.

[0066] The grid converter is therefore particularly designed to form a voltage-defining converter with respect to the second grid section.

[0067] Alternatively or additionally, the grid converter is designed to provide a short-circuit power for the first grid section and / or the second grid section, in particular when a fault occurs in the first grid section and / or in the second grid section.

[0068] Preferably, the electrical network is electrically self-sufficient or isolated.

[0069] This means, in particular, that the electrical grid is not connected to an electrical distribution or interconnected grid, such as the European interconnected grid. Rather, the electrical grid is designed as an island grid. This also means, in particular, that the grid voltage and / or the grid frequency within the electrical grid must be independently regulated, for example, by using a grid former that injects a specific voltage into the electrical grid or the first or second grid section.

[0070] However, the electrical grid may be connected to smaller electrical grids, i.e. grids that have a smaller nominal grid power and / or nominal grid voltage, such as the electrical grid of a port in which the gas generated by the hybrid power plant described herein is loaded.

[0071] In particular, the electrical network is not connected to an electrical supply or interconnected network or another electrical distribution network with an equal or greater nominal network power.

[0072] In particular, the first grid section is not connected to any other electrical distribution grid and / or an electrical supply or interconnected grid. Therefore, essentially only the wind turbines, the gas generation plants, and the grid converter are connected to the first grid section.

[0073] Preferably, the first network section and / or the second network section are radial or ring-shaped.

[0074] It is therefore also proposed, in particular, to select appropriate grid topologies for the grid sections, taking into account the nominal power of each grid section. For example, it may be appropriate to structure the first grid section as a radial grid for a certain number of wind turbines, and to structure the first grid section as a ring grid for a different number of wind turbines.

[0075] Preferably, the first network section and / or the second network section and / or the network converter has further connections for electrical means designed to stabilize the first network section and / or the second network section, and in particular the first network voltage and / or the second network voltage and / or the first network frequency and / or the second network frequency and / or the network converter and / or the network converter. The connections can be formed, for example, by cables and / or lines and / or transformers and / or converters and / or circuit breakers and / or the like.

[0076] The connections are particularly designed to connect electrical means to the electrical network, i.e., the first network section or the second network section or the network converter, such as a network generator, a network generator, a rotating mass, an electrical storage device, a fuel cell, a load, or the like. In particular, the electrical means are configured as described below.

[0077] According to the invention, a hybrid power plant or a hybrid system is further proposed, comprising an electrical grid as described herein, at least one wind turbine connected to the first grid section, and at least one gas generation plant connected to the first grid section and to the second grid section.

[0078] The at least one wind turbine can be of any type. The wind turbine is preferably designed as described herein and / or shown in Fig. 1.

[0079] Particularly preferably, the wind turbine is configured, for example by means of a full-scale converter, to be operated stably on a first grid section described herein, in particular even when the grid frequency and / or the grid voltage fluctuates (significantly).

[0080] The hybrid power plant preferably comprises a plurality of wind turbines connected to the first grid section. Preferably, none of the wind turbines is connected to the second grid section. The plurality of wind turbines is preferably configured as a functional unit. The hybrid power plant thus comprises, for example, ten, twenty, fifty, or more wind turbines, which are configured or operated in particular as a functional unit, preferably as a wind farm. The wind turbines of the hybrid power plant preferably have a total rated output of at least 100 MW or more.

[0081] For this purpose, the plurality of wind turbines preferably has a higher-level control unit, in particular a wind farm control unit. The higher-level control unit or the wind farm control unit is preferably configured to control the electrical power generated by the plurality of wind turbines, for example, by providing specifications and / or setpoints to the individual wind turbines or their wind turbine control units. The higher-level control unit or the wind farm control unit preferably controls the electrical power generated by the wind turbines such that the voltage and / or frequency in the first grid section is substantially stable.

[0082] Preferably, the wind turbines are each connected to the first grid section via a transformer, preferably a wind turbine transformer.

[0083] Preferably, the isolated hybrid power plant further comprises at least one gas generation plant. The at least one gas generation plant is connected to both the first grid section and the second grid section and is controlled, for example, by a gas generation plant control unit. The power consumption of the gas generation plant is preferably via a transformer and / or a rectifier connected to the first grid section, in particular to convert the electrical power generated by the wind turbines into gas by means of an electrolyzer. Furthermore, the gas generation plant is also connected to the second grid section, in particular to supply the control technology of the gas generation plant with a stable voltage.

[0084] Particularly preferably, the plurality of wind turbines has a higher rated power than the at least one gas generation plant. In particular, the rated power of the plurality of wind turbines is between 0 and 10 percent higher than the rated power of the at least one gas generation plant.

[0085] Preferably, the wind turbines are each connected to the first grid section via an inverter and / or a transformer. Alternatively or additionally, the gas generation plant is connected to the first grid section via a rectifier and / or a transformer. Additional circuit breakers and / or protective switches can also be provided to establish the connection between the first grid section and the wind turbines or the gas generation plant.

[0086] Preferably, the at least one gas generation plant has voltage- and / or frequency-sensitive auxiliary devices connected to the second grid section. The voltage- and / or frequency-sensitive auxiliary devices of the gas generation plant are thus connected to the second grid section, in particular while the actual power consumption of the gas generation plant for gas generation occurs via the first grid section.

[0087] Voltage- and / or frequency-sensitive auxiliary devices include, in particular, the electrical auxiliary devices of gas generation plants that react sensitively to voltage and / or frequency changes, for example, the measurement and / or warning systems of gas generation plants. Voltage- and / or frequency-sensitive auxiliary devices include, in particular, the electrical devices of a gas generation plant's control technology, such as control units, computers, gas warning systems, and the like. Thus, voltage- and / or frequency-sensitive auxiliary devices are not directly involved in gas generation, but only indirectly.

[0088] The hybrid power plant is preferably designed as a power-to-gas power plant, a power-to-liquid power plant, or a power-to-fuel power plant. The hybrid power plant can also be designed as another P2X power plant.

[0089] Preferably, the hybrid power plant is electrically self-sufficient and / or is designed as a separate or isolated hybrid power plant.

[0090] An isolated hybrid power plant is understood here to mean, in particular, a hybrid power plant and / or a hybrid system whose electrical grid is not connected to another electrical grid, in particular an electrical supply grid.

[0091] However, the electrical grid may have further electrical sub-grids, such as an electrical grid section for the gas processing plants, such as a port for shipping the gas produced by the hybrid power plant or the like.

[0092] The isolated hybrid power plant can therefore also be referred to as a grid-isolated hybrid power plant. In particular, the electrical grid of the isolated hybrid power plant has no electrical connection to another electrical grid, especially one with a higher power output. The hybrid power plant preferably has a plurality of wind turbines with a total rated electrical output of at least 50 MW, preferably at least 80 MW, more preferably at least 100 MW, and more preferably at least 500 MW. In further embodiments, the hybrid power plant can also have 1 GW or more.

[0093] The total rated output of the wind turbines is preferably between 0 and 10 percent higher than the total rated output of the gas generation plants. The hybrid power plant is therefore electrically oversized and could theoretically generate more electrical power with the wind turbines than the gas generation plants can convert into gas.

[0094] Preferably, the at least one gas generation plant is configured to generate hydrogen by means of electrolysis and / or by means of an electrolyzer using electrical energy from the first network section.

[0095] An electrolyzer is specifically a device in which a chemical reaction, i.e., a material transformation, is induced with the aid of electrical current, resulting in electrolysis. The electrolyzer preferably has a polymer electrolyte membrane. The electrolyzer is therefore preferably designed as a PEM electrolyzer.

[0096] Electrolysis is a chemical process in which electric current forces a redox reaction, for example, to produce gas. A direct current source is preferably used for this.

[0097] Preferably, the at least one gas generation plant is configured to synthesize the hydrogen into a further gas or a fluid or a fuel, in particular one of the following: methane; kerosene; e-fuel; synthetic diesel; synthetic hydrocarbons; ammonia; fertilizers and their precursors.

[0098] Preferably, the hybrid power plant further comprises a grid generator and / or grid former and / or a rotating mass and / or further electrical means.

[0099] Preferably, the network transmitter and / or the network former and / or the rotating mass and / or the further electrical means are connected to the first network section and / or to the second network section. The first network section and / or the second network section are therefore particularly designed so that at least one network transmitter and / or a network former and / or a rotating mass can be connected thereto. The first network section and / or the second network section therefore particularly has at least one connection to which a network transmitter and / or a network former and / or a rotating mass can be connected. The connection preferably comprises at least one circuit breaker and / or a transformer and / or a converter, in particular in order to connect the network transmitter and / or the network former and / or the rotating mass to the first network section and / or the second network section.

[0100] The grid former is designed in particular as a voltage-forming, in particular alternating voltage-forming, energy source, for example in the form of a gas or gas and steam turbine with a connected synchronous generator.

[0101] The further electrical means are in particular electrical means as described herein, for example an electrical storage device, an electrical storage device with a voltage-forming converter, a fuel cell or the like.

[0102] The electrical storage device is preferably designed as an electrical energy storage system and comprises at least one battery storage device, which can be or is connected to the second network section, in particular via a voltage-forming converter.

[0103] The fuel cell is preferably configured to generate electrical energy from the gas from the gas generation plants, and in particular to provide it to the second grid section. The fuel cell preferably generates a direct current from the gas, which is preferably converted into an alternating current via a converter and thus made available to the second grid section.

[0104] Preferably, the hybrid power plant comprises a hybrid power plant control unit configured to control the hybrid power plant and / or to execute and / or participate in a method described herein.

[0105] The hybrid power plant control unit is preferably connected to a wind farm control unit and / or a gas generation plant control unit to carry out a method described herein. In a further embodiment, the hybrid power plant control unit, the wind farm control unit, and the gas generation plant control unit can also be housed in a single control unit.

[0106] Alternatively or additionally, the hybrid power plant comprises a wind farm control unit configured to control a plurality of wind turbines and / or to carry out a method described herein.

[0107] Alternatively or additionally, the hybrid power plant comprises a gas generation plant control unit which is configured to control the at least one gas generation plant.

[0108] Preferably, the hybrid power plant control unit and / or the wind farm control unit and / or the gas generation plant control unit is configured to regulate the first grid frequency by means of the plurality of wind turbines and / or the at least one gas generation plant, in particular such that the first grid frequency lies within the first frequency range.

[0109] Alternatively or additionally, the hybrid power plant control unit and / or the wind farm control unit and / or the gas generation plant control unit is configured to regulate the first grid voltage and / or the second grid voltage, in particular such that the first grid voltage substantially corresponds to the first nominal grid voltage and / or such that the second grid voltage substantially corresponds to the second nominal grid voltage.

[0110] Alternatively or additionally, the hybrid power plant control unit and / or the wind farm control unit and / or the gas generation plant control unit is configured to keep the second grid frequency stable.

[0111] Alternatively or additionally, the hybrid power plant control unit and / or the wind farm control unit and / or the gas generation plant control unit is configured to carry out a method described herein.

[0112] Preferably, the hybrid power plant control unit and / or the wind farm control unit comprises a power optimization feature, in particular an MPP tracker and / or a wind sensor, for the plurality of wind turbines in order to generate maximum electrical power with the wind turbines. It is therefore proposed, in particular, that the wind turbines be operated in a power-optimized manner, for example, by using an MPP tracker and / or a wind sensor.

[0113] Additionally or alternatively, the hybrid power plant control unit and / or the gas generation plant control unit has a frequency detection device which detects the grid frequency of the first grid section and adjusts the power absorbed by the gas generation plant from the first grid section to a power generated by the wind turbines in order to keep the grid frequency in the first frequency range.

[0114] It is also proposed that the electrical power consumed by the gas generation plants be adjusted to match the power generated by the wind turbines.

[0115] In a further preferred embodiment, the wind turbines are operated with a first static and the gas generation plants are operated with a second static, wherein the first static and the second static are opposite.

[0116] It is therefore proposed in particular that the power output of the wind turbines and the power consumption of the gas generation plant should behave in opposite directions, in particular in such a way that a power balance is achieved within the first network section.

[0117] The statics are preferably a frequency-active power static or a voltage-reactive power static.

[0118] Preferably, the hybrid power plant control unit is configured to control the hybrid power plant such that the first grid section and / or the second grid section has and / or maintains a predetermined frequency quality.

[0119] To determine frequency quality, an indicator can be used, such as a probability density function of the grid frequency or the like. A predetermined limit is specified for this indicator, and if the indicator is above the predetermined limit, no further measures are taken. If, however, the indicator falls below the predetermined limit, further measures are taken. Such measures can be, for example, changing the droops described herein and / or activating certain operating modes for the hybrid power plant. The predetermined limit for frequency quality is approximately 10 2 / 2000mHz.

[0120] Preferably, the hybrid power plant is designed or dimensioned taking into account at least one of the following criteria: a gust of wind, in particular a 50-year gust; a calm wind; a fault in a wind turbine, which in particular leads to a drop in power of 5 percent or more; a fault in a gas generation plant, which in particular leads to a drop in power of up to 25 percent; a fault in an electrical storage device arranged in the first grid section and / or in the second grid section; and / or an earth fault or short circuit in the electrical grid, in particular in the first grid section of the electrical grid.

[0121] It is therefore particularly proposed that the hybrid power plant be dimensioned taking into account its electrical behaviour and from a grid-related perspective, and not, as is usually the case, solely taking economic factors into account.

[0122] According to the invention, a method for controlling a hybrid power plant is further proposed, in particular as described herein. The method for controlling the hybrid power plant comprises the steps of: detecting an available wind power, in particular by a hybrid power plant control unit and / or a wind farm control unit; specifying a target value, depending on the available wind power, for generating an electrical active power by means of a plurality of wind turbines, in particular by a or the hybrid power plant control unit and / or a or the wind farm control unit; detecting a grid frequency in an electrical grid or in a grid section of the hybrid power plant, in particular by a orthe hybrid power plant control unit and / or a gas generation plant control unit; and specifying a target value, depending on the detected grid frequency, for absorbing further electrical active power by means of at least one gas generation plant, in particular by a or the hybrid power plant control unit and / or a gas generation plant control unit, preferably such that the electrical power absorbed by the at least one gas generation plant substantially corresponds to the electrical power generated by the plurality of wind turbines.

[0123] The wind turbines and the gas generation plants are preferably located on the same grid section and dimensioned for gas generation. This also means, in particular, that the electrical power generated by the wind turbines is essentially completely absorbed by the gas generation plants and converted into gas.

[0124] Preferably, the wind turbines generate the maximum possible power, particularly active power, depending on the prevailing wind. The gas generation plants track this generated power using a frequency-active power control system. The control or regulation of the gas generation plants is carried out in particular in such a way that a power balance prevails in the grid section, particularly the first one.

[0125] It is therefore also proposed in particular that within the hybrid power plant, the wind turbines are primarily controlled and that the gas generation plants adapt their gas production to the power generated by the wind turbines, for example by means of a frequency-active power control that records the grid frequency in the grid section between the wind turbines and the gas generation plant.

[0126] In one embodiment of the hybrid power plant, the wind turbines generate a maximum possible power, for example by means of an MPP tracker, and the gas generation plants regulate their power consumption taking into account the power generated by the wind turbines, in particular such that the grid frequency essentially corresponds to the nominal grid frequency or is within the first frequency range.

[0127] In another embodiment of the hybrid power plant, the control of the hybrid power plant, i.e. in particular the control of power generation and power consumption, is carried out by a hybrid power plant control unit, which is, for example, superior to the wind farm control unit and the gas generation plant control unit.

[0128] Preferably, the method for controlling a hybrid power plant further comprises the steps of: detecting a grid frequency and / or a grid voltage in a grid section; and specifying setpoint values, in particular power setpoint values, to a grid converter, in particular in order to stabilize a voltage and / or a frequency in a first or a second grid section connected to the grid converter.

[0129] The setpoints for the grid converter are preferably specified by a hybrid power plant control unit. The grid converter is designed as described herein and / or is particularly configured to stabilize a frequency and / or a voltage.

[0130] Preferably, the method for controlling a hybrid power plant further comprises the step of adapting statics for wind turbines and / or gas generation plants, in particular as a function of a detected grid frequency and / or a detected grid voltage.

[0131] In a further embodiment, the wind turbines and / or the gas generation plants are controlled, for example, by means of statics and / or the statics are adapted accordingly to the grid frequency or the grid voltage.

[0132] Preferably, the specification of the setpoints, in particular the power setpoints, takes into account a frequency and / or voltage quality.

[0133] It is therefore proposed in particular that the grid frequency and / or the grid voltage be recorded and evaluated, for example by means of an indicator and / or a statistical means such as a probability density function.

[0134] The target values ​​are then specified taking this assessment and the quality into account. If the quality of the frequency and / or voltage is above average, the target values ​​can be selected more dynamically, for example. If the quality of the frequency and / or voltage is below average, the target values ​​can be selected more statically, for example. By specifying target values ​​in this way, it is possible, in particular, to operate the hybrid power plant more dynamically without the hybrid power plant becoming unstable from an electrical or grid engineering perspective. This approach allows more electrical power and thus more gas to be produced.

[0135] Preferably, the method for controlling a hybrid power plant further comprises the step of detecting a grid voltage and / or a grid frequency in another grid section; and adjusting an active and / or reactive power to be fed in as a function of the detected grid voltage and / or grid frequency at an electrical storage device, which is particularly configured to operate in a voltage-forming manner in the other grid section. Preferably, the power generated by the wind turbines is temporarily reduced until the power drawn from the gas generation plant corresponds to the power generated by the wind turbines, particularly when a gust of wind occurs and / or the grid frequency leaves a frequency range.

[0136] Alternatively or additionally, the power consumed by the gas generation plant is reduced until the power generated by the wind turbines corresponds to the power taken off by the gas generation plant, in particular when there is no wind and / or the grid frequency leaves a frequency range.

[0137] In particular, a frequency range is specified for the grid frequency, and only when the grid frequency leaves this frequency range does the system actively intervene in the power control of the wind turbines and / or gas generation plants. This is shown, for example, in Fig. 3.

[0138] Preferably, the method for controlling a hybrid power plant further comprises the step of: switching off and / or shutting down the hybrid power plant, in particular such that the first grid section is de-energized, if a gas alarm is triggered in the gas generation plant; and / or an earth fault and / or short circuit occurs in the grid section; and / or the performance of the gas generation plant falls, in particular suddenly, below 75 percent.

[0139] For example, the capacity of gas generation plants can fall below 75 percent because several electrolyzers fail. This can have various causes, such as damage to the electrolyzers or electrical faults in the other, particularly second, grid section.

[0140] According to the invention, a wind turbine is further proposed which has an electrical generator with an electrical stator and an electrical rotor, and a converter which is designed to be operated stably on a network section of an electrical network, wherein the network section has a network frequency which fluctuates by up to + / - 10 Hz, preferably + / - 7 Hz, more preferably + / - 3 Hz, around the nominal network frequency.

[0141] The wind turbine thus comprises, in particular, a converter, in particular a power converter, which is preferably designed as a full-scale converter and can be operated stably on a grid section having a strongly fluctuating frequency. The converter is therefore particularly configured to be operated on a first grid section of an electrical grid of a hybrid power plant, as described herein. The converter therefore has a specific grid-specific control range, preferably a large grid-specific control range. This can be achieved, for example, by equipping the converter with appropriate power electronics and / or a corresponding converter control unit with appropriate control programs and / or operating modes.

[0142] Alternatively or additionally, the converter of the wind turbine is designed for wide voltage fluctuations in the electrical grid or grid section.

[0143] The wind turbine preferably has a nominal output of between 2 MW and 10 MW.

[0144] Preferably, the converter is designed to operate stably on a network section with a frequency quality of 10 2 / 2000mHz or better.

[0145] The converter is therefore particularly designed to be operated on a network section that has a wide frequency operating range or where the network frequency is extremely volatile or fluctuates greatly.

[0146] Preferably, the converter has at least one FRT mode in which the wind turbine is connected to a grid section and does not feed in any electrical power, even if the grid section has a grid voltage that is less than 80 percent of the nominal grid voltage.

[0147] Preferably, the wind turbine further comprises a wind turbine transformer connecting the converter to a first grid section as described herein.

[0148] The parts, brewing units, and components described herein are to be understood in particular as electrical parts, brewing units, and components which, if described as interconnected, are electrically connected to one another. A corresponding electrical current flows between the individual parts, assemblies, and components, or a corresponding electrical power is transported. The present invention is explained in more detail below with reference to the accompanying figures, wherein the same reference numerals are used for identical or similar parts or assemblies.

[0149] Fig. 1A shows schematically and exemplarily a perspective view of a wind turbine in one embodiment.

[0150] Fig. 1 B shows schematically and exemplarily a structure of an electrical string of a wind turbine in one embodiment.

[0151] Fig. 2 shows schematically and exemplarily a structure of an isolated hybrid power plant in one embodiment.

[0152] Fig. 3 shows a schematic and exemplary frequency-power control of a hybrid power plant.

[0153] Fig. 1 A shows a schematic and exemplary perspective view of a wind turbine 100.

[0154] The wind turbine 100 has a tower 102 and a nacelle 104.

[0155] An aerodynamic rotor 106 with three rotor blades 108 is arranged on a hub 110 on the nacelle 104.

[0156] The three rotor blades 108 are arranged in particular symmetrically to the hub 110, and preferably offset by 120° from one another.

[0157] The wind turbine 100 is preferably designed as a lift rotor with a horizontal axis and three rotor blades 108 on the windward side, in particular as a horizontal rotor.

[0158] Fig. 1 B shows schematically and by way of example an electrical string 100' of a wind turbine 100, in particular as shown in Figure 1A.

[0159] The wind turbine 100 has an aerodynamic rotor 106, which is mechanically connected to a generator 120 of the wind turbine 100. The aerodynamic rotor 106 is set in rotation by a wind and thus drives the generator 120. The generator 120 has an electrical stator 122 and an electrical rotor 124. The generator 120 is preferably designed as a 6-phase and / or separately excited synchronous generator, in particular with two three-phase stator systems 122', 122", which are phase-shifted by 30 degrees and electrically decoupled from one another.

[0160] The generator 120 is connected via a converter 130 and, for example, a wind turbine transformer 150 to an electrical network, in particular to a first network section 1110 of an electrical network 1100 of an isolated hybrid power plant 1000, as shown, for example, in Fig. 2.

[0161] The converter 130 converts the electrical power generated by the generator 120 into a three-phase alternating current ig to be fed in. For this purpose, the converter 130 is preferably designed as a converter system, ie, the converter has several converter modules that are preferably connected in parallel.

[0162] The converter 130 comprises a rectifier 132, in particular an active rectifier, optionally an intermediate circuit 134 and an inverter 136. The converter 130 or the converter modules are preferably designed as direct converters (back-to-back converters).

[0163] In addition, an excitation 138 is led out of the converter 130, in particular from the DC link 134, which is controlled by means of an excitation current i er the generator 120 is separately excited.

[0164] The converter 130 is controlled by a control unit 140. The control unit 140 can also be referred to as a converter control unit. The control unit 140 is preferably connected to a wind turbine control unit and / or a grid operator in order to determine target values ​​Bwea, for example, for the current i to be fed in. g or to receive the power to be generated.

[0165] Fig. 2 shows schematically and exemplarily a structure of an isolated hybrid power plant 1000 in one embodiment.

[0166] The isolated hybrid power plant 1000 comprises an electrical grid 1100, a plurality of wind turbines 100 and several gas generation plants 200. The electrical grid 1100 has a first grid section 1110 and a second grid section 1120, which are connected to one another via a grid converter 1130.

[0167] The plurality of wind turbines 100 and the plurality of gas generation plants 200 are connected to the first grid section 1110. Furthermore, the first grid section has a rotating mass 1170.

[0168] The wind turbines 100 are configured as described herein and are connected, in particular, to the first grid section 1110 via a wind turbine transformer 150. Preferably, each wind turbine 100 also has a wind turbine control unit.

[0169] The gas generation plants 200 are configured as described herein and are connected, in particular, to the first grid section 1110 via a gas generation plant transformer 250 and an active rectifier 230. The gas generator 220, in particular an electrolyzer, draws the required electrical power from the first grid section 1110 via the gas generation plant transformer 250 and a rectifier 230. The frequency- and voltage-sensitive auxiliary devices 270 of the gas generation plants 200 are further connected to the second grid section 1120.

[0170] The rotating mass 1170 serves the first grid section, in particular, as a grid transmitter. The rotating mass 1170 thus in particular imparts a voltage to the first grid section, with which the wind turbines 100 can synchronize. The rotating mass 1170 is formed, for example, from a gas turbine with a synchronous generator or from an electrical storage unit with a virtual synchronous machine.

[0171] An electrical storage device 1140, in particular a battery energy storage system (BESS) with a voltage-defining converter, a fuel cell 1150 with a voltage-defining converter, an electrical load 1160 and the frequency- and voltage-sensitive auxiliary devices 270 of the gas generation plants are connected to the second network section 1120.

[0172] The electrical load 1160 is, for example, an electrical network of a port and / or a gas pipeline, which are supplied with electricity by the second network section, in particular such that the gas can be transported away. The first network section 1110 and the second network section 1120 are further connected via a common grid converter 1130. The grid converter is designed, in particular, as described herein.

[0173] The hybrid power plant 1000 is controlled by a hybrid power plant control unit 1180. The hybrid power plant control unit 1180 comprises, for example, a wind farm control unit 1182 and / or a gas generation plant control unit 1184 and is configured to preferably control all electrical means of the hybrid power plant, in particular by means of setpoints.

[0174] Fig. 3 shows schematically and by way of example a frequency-power control 300 of a hybrid power plant 1000, in particular using a coordinate system, wherein the grid frequency f1 is plotted on the x-axis of the coordinate system and the electrical power P is plotted on the y-axis of the coordinate system.

[0175] For a better understanding, the nominal power PN_wea of ​​the wind turbines is also shown in the coordinate system.

[0176] As long as the grid frequency f1 is within the first frequency range AfN1 , which is, for example, + / - 1 Hz, essentially no control interventions are carried out within the first grid section, and the hybrid power plant operates in a first operating range AFF in which the grid frequency f1 is essentially free-floating (free floating system frequency).

[0177] If, for example, a strong gust of wind leads to an increase in the electrical power P generated by the wind turbines and, consequently, an increase in the grid frequency f1, the wind turbines can be regulated if the grid frequency f1 moves outside the frequency range AfN1. For example, the electrical power generated by the wind turbines is then actively throttled, in particular until the power drawn from the gas generation plant equals the power generated by the wind turbines. This is characterized by the second operating range AWF.

[0178] If, for example, a lack of wind leads to a reduction in the electrical power P generated by the wind turbines and, consequently, a reduction in the grid frequency f1, the gas generation plants can be regulated if the grid frequency f1 is outside the frequency range AfN1. For example, the electrical power consumed by the gas generation plants is actively throttled, especially until the power generated by the wind turbines corresponds to the power consumed by the gas generation plant, especially during periods of low wind.

[0179] List of reference symbols

[0180] 100 wind turbines

[0181] 100' electrical string, especially the wind turbine

[0182] 102 tower, especially the wind turbine

[0183] 104 nacelles, especially the wind turbine

[0184] 106 aerodynamic rotor, especially of the wind turbine

[0185] 108 rotor blade, especially of the wind turbine

[0186] 110 Hub, especially of the wind turbine

[0187] 120 generator, especially the wind turbine

[0188] 122 Stator, in particular electrical stator of the generator

[0189] 122' first electrical system, in particular the stator

[0190] 122" second electrical system, especially the stator

[0191] 124 Rotor, in particular electric rotor of the generator

[0192] 130 converters, especially power converters for wind turbines

[0193] 150 Transformer, especially the wind turbine transformer

[0194] 200 gas generation plant

[0195] 220 gas generators, especially electrolyzers

[0196] 230 converters, especially rectifiers of the gas generation plant

[0197] 250 transformer, especially the gas generation plant

[0198] 300 Frequency-power control, especially of a hybrid power plant

[0199] 1000 isolated hybrid power plants

[0200] 1100 electrical network

[0201] 1110 first network section, in particular of the electrical supply network 1120 second network section, in particular of the electrical supply network 1130 network converter, in particular of the electrical distribution network

[0202] 1140 electrical energy storage

[0203] 1150 Fuel cell, especially with voltage-forming converter

[0204] 1160 electrical load

[0205] 1170 rotating mass

[0206] 1180 control unit, especially of the hybrid power plant

[0207] 1182 Control unit, especially for wind turbines

[0208] 1184 Control unit, in particular of the gas generation plants fN 1 first nominal network frequency, in particular of the first network section fN2 second nominal network frequency, in particular of the second network section f1 first network frequency, in particular of the first network section f2 second network frequency, in particular of the second network section

[0209] 51 first network statics, especially of the first network section

[0210] 52 second network statics, in particular of the second network section

[0211] UN1 first nominal network voltage, in particular of the first network section

[0212] UN2 second nominal network voltage, in particular of the second network section

[0213] U1 first mains voltage, in particular of the first network section

[0214] U2 second grid voltage, in particular of the second grid section

[0215] AfN1 first frequency range, in particular the first network section

[0216] PN_wea Nominal power, especially of wind turbines

[0217] P_wea generated electrical power of the wind turbine

[0218] P_E2 consumed electrical power of the gas generation plant

[0219] AFF first working area, especially free-floating

[0220] AWF second working area, especially reduction of the generated power

Claims

Claims 1 . An electrical network (1100), in particular for a single-unit hybrid power plant (1000), comprising: a first network section (1110) configured to: be connected to at least one wind turbine, to be connected to at least one gas generation plant, and to transport electrical power generated by the wind turbine to the at least one gas generation plant; a second network section (1120) configured to: be connected to the at least one gas generation plant;and a network converter or network inverter (1130) which electrically connects the first network section (1110) and the second network section (1120) and is configured to: bidirectionally exchange electrical power between the first electrical network section (1110) and the second electrical network section (1120), wherein the first network section (1110) has a first nominal network frequency (fN1) and a first nominal network voltage (UN1) and can be operated with a first network frequency (f1) and a first network voltage (U1); and the second network section (1120) has a second nominal network frequency (fN2) and a second nominal network voltage (UN2) and can be operated with a second network frequency (f2) and a second network voltage (U2); and wherein; the first network section (1110) is designed for a first frequency range (Af1) around the nominal network frequency (fN1), in which the first network frequency (f1) moves; and the second network section (1120) is designed for a second frequency range (Af2) around the nominal network frequency (fN2), in which the second network frequency (f2) moves; wherein the first frequency range (Af1) is greater than the second frequency range (Af2). The electrical network (1100) according to claim 1, wherein the first network section (1110) has a first nominal power (P_Nenn_1) and the second network section (1120) has a second nominal power (P_Nenn_2), wherein the first nominal power (P_Nenn_1) is greater than the second nominal power (P_Nenn_2), in particular at least 5 times as great, preferably at least 10 times as great.The electrical network (1100) according to claim 1 or 2, wherein the first frequency range (Af1) is equal to and / or less than 20 percent, preferably equal to and / or less than 10 percent, of the first nominal network frequency (fN1); and / or the second frequency range (Af2) is equal to and / or less than 2 percent, preferably equal to and / or less than 1 percent, of the second nominal network frequency (fN2). The electrical network (1100) according to at least one of the preceding claims, wherein the second network section (1120) is configured to supply voltage- and / or frequency-sensitive auxiliary devices, in particular gas generation plants, with electrical power in a voltage- and / or frequency-stable manner.

5. Electrical network (1100) according to at least one of the preceding claims, wherein the network converter (1130) is configured to: exchange electrical power between the first network section (1110) and the second network section (1120), preferably bidirectionally; form a network former and / or regulated current source for the first network section and / or the second network section; stabilize the network voltage and / or the network frequency in the first network section and / or in the second network section; provide a stable second network frequency (f2) and / or a stable second network voltage (U2) in the second network section, in particular for voltage- and / or frequency-sensitive auxiliary devices; impress a network voltage (U2) into the first network section and / or the second network section (1120).to provide short-circuit power for the first grid section and / or the second grid section, in particular when a fault occurs in the first grid section and / or the second grid section. to provide active and reactive power for the first grid section and / or the second grid section without delay.

6. Electrical network (1100) according to at least one of the preceding claims, wherein the electrical network (1100) is electrically self-sufficient or isolated; and / or the electrical network (1100) is connected exclusively to other electrical networks that have a lower nominal network power and / or nominal network voltage; and / or the electrical grid (1100) is not connected to an electrical supply or interconnected grid or another electrical distribution grid, which in particular has an equal or greater nominal grid power and / or nominal grid voltage than the first grid section (1110) and / or the second grid section (1120); the first grid section (1110) is not connected to another electrical distribution grid and / or an electrical supply or interconnected grid. A hybrid power plant (1000), in particular an isolated hybrid power plant, comprising: an electrical distribution grid (1110) according to at least one of claims 1 to 6, a plurality of wind turbines (100) connected to the first grid section (1110), and at least one gas generation plant (200) connected to the first grid section (1110) and to the second grid section (1120).Hybrid power plant (1000) according to claim 7, wherein the wind turbines (100) are each connected to the first grid section (1110) via an inverter (130) and / or a transformer (150) and / or the gas generation plant (200) is connected to the first grid section via a rectifier (230) and / or a transformer (250). Hybrid power plant (1000) according to claim 7 or 8, wherein the gas generation plant (200) has voltage- and / or frequency-sensitive auxiliary devices that are connected to the second grid section. Hybrid power plant (1000) according to at least one of claims 7 to 9, wherein the hybrid power plant is designed as a power-to-gas power plant or as a power-to-liquid power plant or power-to-fuel power plant and / or. the hybrid power plant is electrically self-sufficient and / or is designed as a stand-alone or isolated hybrid power plant.

11. Hybrid power plant (1000) according to at least one of claims 7 to 10, comprising at least one grid generator and / or grid former and / or a rotating mass and / or further electrical means.

12. Hybrid power plant (1000) according to at least one of claims 7 to 11, further comprising: a hybrid power plant control unit (1180) configured to control the hybrid power plant; and / or a wind farm control unit configured to control the plurality of wind turbines; and / or a gas generation plant control unit configured to control the one or more gas generation plants.

13. Hybrid power plant (1000) according to claim 12, wherein the hybrid power plant control unit and / or the wind farm control unit and / or the gas generation plant control unit is configured to regulate the first grid frequency (f1) by means of the plurality of wind turbines (100) and / or the at least one gas generation plant (200), in particular such that the first grid frequency (f1) lies within the first frequency range (Af1); and / or to regulate the first grid voltage (U1) and / or the second grid voltage (U2); and / or to keep the second grid frequency (f2) stable.

14. Hybrid power plant (1000) according to claim 12 or 13, wherein the hybrid power plant control unit (1180) and / or the wind farm control unit (1182) has a power optimization, in particular an MPP tracker and / or a wind detection system, for the plurality of wind turbines in order to generate maximum electrical power with the wind turbines and / or the hybrid power plant control unit (1180) and / or the gas generation plant control unit (1184) has a frequency detection system which detects the grid frequency (f1) of the first grid section and adjusts the power absorbed by the gas generation plant from the first grid section to a power generated by the wind turbines (100) in order to keep the grid frequency (f1) in the first frequency range (Af1).

15. Hybrid power plant (1000) according to one of claims 7 to 14, wherein the hybrid power plant control unit (1180) and / or the wind farm control unit (1182) has a first static (Swea) and the hybrid power plant control unit (1180) and / or the gas generation plant control unit (1184) has a second static (Sgas), wherein the first static and the second static are opposite.

16. Hybrid power plant (1000) according to at least one of claims 7 to 15, wherein the hybrid power plant control unit (1180) is configured to control the hybrid power plant such that the first network section and / or the second network section has and / or maintains a predetermined frequency quality.

17. Hybrid power plant (1000) according to at least one of claims 7 to 16, wherein the hybrid power plant was dimensioned taking into account at least one of the following criteria, consisting of: a gust of wind, in particular a 50-year gust; a calm wind; a fault in a wind turbine, which in particular leads to a drop in power of 5 percent or more; a fault in a gas generation plant, which in particular leads to a drop in power of up to 25 percent; a fault in an electrical storage device located in the first grid section and / or in the second grid section; an earth fault or short circuit in the electrical grid, in particular in the first grid section of the electrical grid.

18. A method for controlling a hybrid power plant, in particular according to one of claims 7 to 17, comprising the steps: Detecting an available wind power, in particular by a hybrid power plant control unit (1180) and / or a wind farm control unit (1182); Specifying a target value, depending on the available wind power, for generating an electrical active power by means of a plurality of wind turbines, in particular by a hybrid power plant control unit (1180) and / or a wind farm control unit (1182); Detecting a grid frequency in an electrical grid or in a grid section of the hybrid power plant, in particular by a hybrid power plant control unit (1180) and / or a gas generation plant control unit (1184); and Specifying a target value, depending on the detected grid frequency, for absorbing a further electrical active power by means of at least one gas generation plant, in particular by a hybrid power plant control unit (1180) and / or a gas generation plant control unit (1184), preferably such that the electrical power absorbed by the at least one gas generation plant substantially corresponds to the electrical power generated by the plurality of wind turbines.

19. A method for controlling a hybrid power plant according to claim 18, further comprising the steps of: Detecting a network frequency and / or a network voltage in a network section; and Specifying setpoints, in particular power setpoints, to a grid converter, in particular in order to stabilize a voltage and / or a frequency in a first or a second grid section connected to the grid converter.

20. A method for controlling a hybrid power plant according to claim 18 or 19, further comprising the steps: Adaptation of statics for wind turbines and / or gas generation plants, in particular depending on a recorded grid frequency and / or a recorded grid voltage.

21. A method for controlling a hybrid power plant according to at least one of claims 18 to 20, wherein the target values ​​are specified taking into account a frequency and / or voltage quality.

22. A method for controlling a hybrid power plant according to at least one of claims 18 to 21, wherein the wind turbines temporarily reduce the electrical power generated until the power drawn by the gas generation plant corresponds to the power generated by the wind turbines, in particular when a gust of wind occurs and / or the grid frequency leaves a frequency range; and / or the gas generation plant reduces the electrical power drawn until the power generated by the wind turbines corresponds to the electrical power drawn by the gas generation plant, in particular when there is no wind and / or the grid frequency leaves a frequency range.

23. Wind energy plant (100), in particular for a hybrid power plant according to one of claims 7 to 17, comprising: an electrical generator (120) having an electrical stator (122,134) and an electrical rotor (126), and a converter (130) configured to be stably operated on a network section (1110) of an electrical network (1100), wherein the network section has a network frequency (f1) that fluctuates by up to + / - 10 Hz, preferably + / - 7 Hz, more preferably + / - 3 Hz, around the nominal network frequency (fN1).

24. Wind turbine (100) according to claim 23, wherein the converter is designed to operate stably on a network section with a frequency quality of 10 2 / 2000mHz or better.

25. The wind turbine (100) according to claim 23 or 24, wherein the converter has at least one FRT mode, in which the wind turbine is connected to a grid section and does not feed in any electrical power, even if the grid section has a grid voltage that is less than 80 percent of the nominal grid voltage.

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