Offshore wind-solar hydrogen storage ammonia base network control system and broadband oscillation prevention method

Abstract

The present application relates to the technical field of electric energy storage systems, and in particular to a grid-forming control system and broadband oscillation prevention method for an offshore wind-solar-hydrogen-ammonia storage base, which includes: an offshore hydrogen-ammonia base, an offshore wind power base, an offshore photovoltaic base, an inverter station, an offshore wind-solar-hydrogen storage power station, a booster station, a grid-forming energy storage phase-adjusting power station, and a broadband oscillation control and prevention device. This allows for research on grid-forming energy storage control of offshore wind-solar-hydrogen-ammonia multi-energy complementary bases under low short-circuit ratio access and isolated grid operation, achieving voltage, frequency, short-circuit capacity adjustment and inertial support, and oscillation prevention and control, thereby achieving the purpose of optimized regulation and oscillation management of grid support; at the same time, multi-energy complementarity is achieved, energy utilization is improved, hydrogen-ammonia can be prepared through green energy, and carbon emissions are reduced. Thus, the problems of poor frequency stability, weak voltage support capability, and severe weak grid oscillation in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy storage systems, and in particular to a network control system for an offshore wind-solar-hydrogen-ammonia storage base and a method for preventing and controlling broadband oscillations. Background Art

[0002] With the integration of a high proportion of renewable energy, the inertia of synchronous machines in traditional power grids decreases, resulting in a decrease in system strength (short-circuit ratio), which leads to the following problems:

[0003] 1. Frequency stability: Wind and solar power sources lack inertial response, and frequency fluctuations are exacerbated;

[0004] 2. Voltage support capability: Power electronic equipment (such as grid-following inverters) relies on grid voltage and cannot independently build voltage;

[0005] 3. Weak grid oscillation: Under low short-circuit capacity, control loop interaction causes subsynchronous oscillation or high-frequency resonance.

[0006] In summary, the existing technology has poor frequency stability, weak voltage support capability, and severe weak grid oscillation, which needs to be solved urgently. Summary of the Invention

[0007] The present application provides an offshore wind-solar-hydrogen-storage-ammonia-alcohol base network control system and a broadband oscillation prevention and control method to solve the problems of poor frequency stability, weak voltage support capability, and severe weak grid oscillation in the prior art.

[0008] The first embodiment of the present application provides a method for preventing and controlling broadband oscillations of a network control system of an offshore wind-solar-hydrogen-storage-ammonia base, comprising the following steps: an offshore wind power base, wherein the input end of the offshore wind power base is connected to the first output end of a preset offshore hydrogen-ammonia base, for providing offshore wind power resources, and in the case of isolated grid operation and frequent wind power generation, connecting a preset hydrogen electrolyzer to prepare hydrogen; an offshore photovoltaic base, wherein the input end of the offshore photovoltaic base is connected to the second output end of the offshore hydrogen-ammonia base, for providing offshore photovoltaic resources, and in the case of isolated grid operation and frequent photovoltaic generation, connecting the hydrogen electrolyzer to prepare hydrogen; an offshore hydrogen-ammonia base, for utilizing the offshore wind power base and the The surplus electricity and hydrogen of the offshore photovoltaic base are used to prepare hydrogen ammonia, so as to carry out multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base, and provide raw material supply for the target ships and distributed power generation units; an inverter station, the input end of the inverter station is connected to the output end of the offshore photovoltaic base, and is used to convert the direct current output of the offshore photovoltaic base into alternating current; an offshore wind-solar base energy storage power station, the first input end of the offshore wind-solar base energy storage power station is connected to the output end of the offshore wind power base, the second input end of the offshore wind-solar base energy storage power station is connected to the output end of the inverter station, and the output end of the offshore wind-solar base energy storage power station is connected to a preset first busbar , used to smooth the AC power output generated by the offshore wind power base and the offshore photovoltaic base, and output or store corresponding active power and reactive power according to the output power of the offshore wind power base and the offshore photovoltaic base to balance the target power system power; a booster station, the input end of the booster station is connected to the first busbar, and the output end of the booster station is connected to the preset second busbar, used to increase the AC power output of the offshore wind and solar base energy storage power station to the target voltage level; a grid-type energy storage phase-adjusting power station, the input end of the grid-type energy storage phase-adjusting power station is connected to the second busbar, and the output end of the grid-type energy storage phase-adjusting power station is connected to the preset third busbar, used The invention further comprises a method for performing preset networking and phase adjustment operations on the AC power of the target voltage level to generate the target AC power after networking, and performing a corresponding broadband impedance scanning operation on the target AC power to obtain the full network impedance, and judging whether the target AC power has an oscillation risk based on the full network impedance; a broadband oscillation control and prevention device, wherein the input end of the broadband oscillation control and prevention device is connected to the third busbar, and is used to perform a preset broadband oscillation prevention operation when the target AC power has the oscillation risk, wherein the networking type static compensator group and the networking type unified power flow controller group in the broadband oscillation control and prevention device have impedance adjustment function and networking properties.

[0009] According to the above technical means, the embodiments of the present application can study the network control and broadband oscillation prevention and control methods of offshore wind-solar-hydrogen-ammonia multi-energy complementary bases under low short-circuit ratio access and isolated grid operation through offshore photovoltaic bases, inverter stations, offshore hydrogen-ammonia bases, grid-type energy storage phase-adjustment power stations, offshore wind-solar base energy storage power stations, booster stations, etc., thereby realizing multi-energy complementarity, improving energy utilization, and preparing hydrogen-ammonia through green energy, reducing carbon emissions.

[0010] Optionally, in one embodiment of the present application, the grid-type energy storage phase-adjusting power station includes:

[0011] Multiple multi-energy storage units;

[0012] Multiple synchronous condensers;

[0013] A synchronous condenser group consisting of the plurality of synchronous condensers connected in series;

[0014] A plurality of grid-type energy storage converters, wherein the input ends of the plurality of grid-type energy storage converters are connected to the output ends of the plurality of multi-element energy storage units, and are configured to provide target alternating current with a preset frequency and grid-type properties by using a preset grid-type control strategy;

[0015] A plurality of energy storage modules consisting of the plurality of multi-element energy storage units and the plurality of grid-type energy storage converters;

[0016] An energy storage module group consisting of the plurality of energy storage modules connected in series;

[0017] Multiple grid-type energy storage phase-modulation controllers, the output end of each phase grid-type energy storage phase-modulation controller is connected to the input end of the synchronous phase condenser group, and the input end of each phase grid-type energy storage phase-modulation controller is connected to the energy storage module group, for coordinating and controlling the energy storage module group and the synchronous phase condenser group to perform primary, secondary, and tertiary frequency modulation, voltage regulation, and active power, reactive power and short-circuit capacity regulation operations.

[0018] According to the above technical means, the embodiment of the present application constructs a grid-type energy storage phase-modulation power station through N energy storage modules composed of N multi-element energy storage units and N grid-type energy storage converters, N energy storage module groups connected in series to form an energy storage module group, N synchronous phase modulators connected in series to form a synchronous phase modulator group and a grid-type energy storage phase-modulation controller for each phase, thereby realizing voltage, frequency, short-circuit capacity adjustment and inertial support; at the same time, it can conduct research on grid-type energy storage control of offshore wind, solar, hydrogen, ammonia and alcohol multi-energy complementary bases under low short-circuit ratio access conditions, providing reliable technical guidance and basis for the optimization regulation and oscillation control of the power grid.

[0019] Optionally, in one embodiment of the present application, the multi-element energy storage unit includes: a supercapacitor group for providing inertia support for instantaneous energy storage; a sodium ion battery group for performing energy storage operations that meet a first preset time requirement; and a hydrogen storage device for performing energy storage operations that meet a second preset time requirement.

[0020] According to the above technical means, the embodiment of the present application uses a sodium ion battery pack, a supercapacitor pack and a hydrogen storage device to form a multi-element energy storage unit, thereby providing hardware support for electric energy storage and ensuring the reliability of the subsequent construction of a grid-type energy storage phase-modulation power station.

[0021] Optionally, in one embodiment of the present application, when connected at a low short-circuit ratio, the synchronous phase regulator in the grid-type energy storage phase-modulation power station is used to provide short-circuit capacity.

[0022] According to the above technical means, the embodiment of the present application can provide short-circuit capacity through the synchronous phase regulator under low short-circuit ratio access conditions, thereby improving system stability.

[0023] Optionally, in one embodiment of the present application, the offshore wind power base includes: a plurality of grid-type wind turbines; a wind turbine control device, wherein the wind turbine control device and the plurality of grid-type wind turbines are connected in parallel, and are used to obtain wind speed information corresponding to the offshore wind power base during normal operation, and determine the type of grid-type wind turbine to be operated based on the wind speed information, and distribute the active power and reactive power generated by the plurality of wind turbines in the offshore wind power base through the wind turbine control device, wherein the types of grid-type wind turbines include doubly fed wind turbines and direct drive wind turbines.

[0024] According to the above technical means, the embodiment of the present application constructs an offshore wind power base through multiple grid-type wind turbines and wind turbine control devices, thereby providing important technical support for the generation of offshore wind power energy.

[0025] Optionally, in one embodiment of the present application, the offshore photovoltaic base includes: photovoltaic panels for acquiring solar energy resources of the offshore photovoltaic base and converting the solar energy resources into the offshore photovoltaic resources.

[0026] According to the above technical means, the embodiment of the present application constructs an offshore photovoltaic base through photovoltaic panels, thereby ensuring the realization of offshore wind and solar energy complementarity.

[0027] Optionally, in one embodiment of the present application, the offshore wind and solar base energy storage power station includes: a lithium iron phosphate and lithium titanate battery compartment composed of a preset lithium iron phosphate battery system, a lithium titanate battery system, a battery control cabinet, a battery power supply cabinet, a battery management system, an energy management system and a grid-type converter, which is used to smooth the output of the offshore wind power base and the offshore photovoltaic base, and balance the system active power and reactive power, wherein the lithium iron phosphate battery system and the lithium titanate battery system include multiple groups of lithium iron phosphate and lithium titanate battery groups connected in parallel, and the lithium iron phosphate and lithium titanate battery groups are composed of lithium iron phosphate batteries and lithium titanate batteries connected in series.

[0028] According to the above technical means, the embodiment of the present application uses an offshore wind and solar base energy storage power station composed of lithium iron phosphate and lithium titanate battery compartments to smooth the output of the wind and solar base, thereby balancing the system active power and reactive power.

[0029] Optionally, in one embodiment of the present application, the broadband oscillation control and prevention device includes: a virtual impedance control system, which is used to determine whether increasing or decreasing the impedance will continue to cause oscillation when the target AC power has the oscillation risk, wherein when increasing or decreasing the impedance will not continue to cause oscillation, the preset PID controller parameters are adjusted to adjust the impedance; the meshed unified power flow controller group and the meshed static compensator group are used to adjust the PID controller parameters to adjust the impedance when increasing or decreasing the impedance will continue to cause oscillation, until no oscillation occurs.

[0030] According to the above technical means, the embodiment of the present application constructs a broadband oscillation control and prevention device through a virtual impedance control system, a meshed unified power flow controller group and a meshed static compensator group, which can perform oscillation prevention.

[0031] Optionally, in one embodiment of the present application, the grid-type static compensator group and the grid-type unified power flow controller group have grid-type properties, and the voltage amplitude is adjusted by adjusting the reactive power in the grid-type static compensator group, and the voltage amplitude and phase angle are adjusted by adjusting the grid-type unified power flow controller group.

[0032] According to the above technical means, the embodiment of the present application utilizes a grid-type static compensator group and a grid-type unified power flow controller group with impedance adjustment function and grid-forming properties to achieve the purpose of adjusting the voltage amplitude and voltage phase angle, thereby achieving the purpose of optimizing the adjustment of the grid support and oscillation control.

[0033] The second embodiment of the present application provides an offshore wind-solar-hydrogen-storage-ammonia base network control system, comprising the following steps: providing offshore wind power resources and offshore photovoltaic resources through a preset offshore wind power base and an offshore photovoltaic base, and connecting a preset hydrogen electrolyzer to produce hydrogen in the case of isolated grid operation and frequent wind power generation; based on the preset offshore hydrogen-ammonia base, utilizing the excess electric energy and hydrogen of the offshore wind power base and the offshore photovoltaic base to prepare hydrogen-ammonia, so as to carry out multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base, while providing raw material supply for target ships and distributed power generation units; converting the direct current output of the offshore photovoltaic base into alternating current, and smoothing the power supply between the offshore wind power base and the offshore photovoltaic base; The generated AC power output is output, and according to the output power of the offshore wind power base and the offshore photovoltaic base, the corresponding active power and reactive power are output or stored to balance the target power system power; the AC power output by the offshore wind and solar base energy storage power station is increased to the target voltage level, and the preset grid-forming and phase-adjusting operations are performed on the AC power of the target voltage level through the grid-forming energy storage phase-adjusting power station to generate the target AC power after grid-forming, and a 0.1~2500HZ broadband impedance scanning operation is performed on the target AC power to obtain the full network impedance, and based on the full network impedance, it is judged whether the target AC power has an oscillation risk, so that when the target AC power has the oscillation risk, a preset broadband oscillation prevention and control operation is performed.

[0034] Therefore, the embodiments of the present application have the following beneficial effects:

[0035] The embodiments of the present application include an offshore hydrogen ammonia base, an offshore wind power base, an offshore photovoltaic base, an inverter station, an offshore wind-solar base energy storage power station, a booster station, a grid-type energy storage phase-adjusting power station, and a broadband oscillation control and prevention device, so that the offshore wind-solar hydrogen ammonia multi-energy complementary base grid-type energy storage control research can be carried out under low short-circuit ratio access and isolated grid operation, realizing voltage, frequency, short-circuit capacity adjustment and inertial support, and oscillation prevention and control, achieving the purpose of optimized regulation and oscillation management of grid support; at the same time, multi-energy complementarity is realized, energy utilization is improved, and hydrogen ammonia can be prepared through green energy, reducing carbon emissions. The present application uses an offshore photovoltaic base, an inverter station, an offshore hydrogen ammonia base, a grid-type energy storage phase-adjusting power station, an offshore wind-solar base energy storage power station booster station, etc. to carry out offshore wind-solar hydrogen ammonia multi-energy complementary base grid-type energy storage control and broadband oscillation prevention and control method research under low short-circuit ratio access and isolated grid operation, so that multi-energy complementarity is realized, energy utilization is improved, and hydrogen ammonia can be prepared through green energy, reducing carbon emissions. This solves the problems of poor frequency stability, weak voltage support capability, and severe weak grid oscillation in the prior art.

[0036] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 This is an example diagram of a network control system for an offshore wind-solar-hydrogen storage ammonia-alcohol base according to an embodiment of the present application;

[0039] Figure 2 A voltage control schematic diagram of a grid-type energy storage phase modulation controller provided in one embodiment of the present application;

[0040] Figure 3 A schematic structural diagram of a grid-type energy storage phase-adjusting power station provided in accordance with one embodiment of the present application;

[0041] Figure 4 An internal circuit connection diagram of a grid-type energy storage phase-modulation power station provided in one embodiment of the present application;

[0042] Figure 5 This is a flow chart of a method for preventing and controlling broadband oscillations in a network control system of an offshore wind-solar-hydrogen-storage-ammonia-alcohol base provided according to an embodiment of the present application.

[0043] Among them, 10-offshore wind-solar hydrogen storage ammonia base network control system; 100-offshore hydrogen ammonia base, 200-offshore wind power base, 300-offshore photovoltaic base, 400-inverter station, 500-offshore wind-solar base energy storage power station, 600-boosting station, 700-grid-type energy storage phase-adjusting power station, 800-wideband oscillation control and prevention device. DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0045] The following describes the offshore wind-solar-hydrogen-storage-ammonia-alcohol base network control system and broadband oscillation prevention and control method of the embodiment of the present application with reference to the accompanying drawings. In response to the problems mentioned in the above background technology, the present application provides an offshore wind-solar-hydrogen-storage-ammonia-alcohol base network control system, in which the system includes an offshore hydrogen-ammonia-alcohol base, an offshore wind power base, an offshore photovoltaic base, an inverter station, an offshore wind-solar-hydrogen storage power station, a booster station, a network-type energy storage phase-adjusting power station, and a broadband oscillation control and prevention device, so that the offshore wind-solar-hydrogen-ammonia-alcohol multi-energy complementary base network-type energy storage control research can be carried out under low short-circuit ratio access and isolated grid operation, realizing voltage, frequency, short-circuit capacity adjustment and inertial support, and oscillation prevention and control, so as to achieve the purpose of optimizing the adjustment of the power grid support and oscillation management; at the same time, multi-energy complementarity is realized, the utilization rate of energy is improved, and hydrogen-ammonia-alcohol can be prepared by green energy, reducing carbon emissions. This application uses offshore photovoltaic bases, inverter stations, offshore hydrogen ammonia bases, grid-type energy storage phase-adjustment power stations, offshore wind-solar base energy storage power stations, and booster stations to study methods for controlling the grid construction and preventing broadband oscillations of offshore wind-solar-hydrogen storage ammonia multi-energy complementary bases under low short-circuit ratio access and isolated grid operation. This enables multi-energy complementarity, improves energy utilization, and can produce hydrogen ammonia from green energy, reducing carbon emissions. This solves the problems of poor frequency stability, weak voltage support capability, and severe weak grid oscillations in existing technologies.

[0046] First, the offshore wind-solar-hydrogen-storage-ammonia-alcohol base network control system proposed in accordance with an embodiment of the present application is described with reference to the accompanying drawings.

[0047] Specifically, Figure 1 It is a block diagram of the network control system of the offshore wind-solar hydrogen storage ammonia base in an embodiment of the present application.

[0048] like Figure 1 As shown, the offshore wind-solar-hydrogen-storage-ammonia base grid control system 10 includes: an offshore hydrogen-ammonia base 100, an offshore wind power base 200, an offshore photovoltaic base 300, an inverter station 400, an offshore wind-solar base energy storage power station 500, a booster station 600, a grid-type energy storage phase-adjusting power station 700, and a broadband oscillation control and prevention device 800.

[0049] Among them, the input end of the offshore wind power base 200 is connected to the first output end of the preset offshore hydrogen ammonia base 100, which is used to provide offshore wind power resources, and is connected to a preset hydrogen electrolyzer to produce hydrogen under isolated grid operation and high wind power generation conditions.

[0050] The embodiment of the present application can first connect the input end of the offshore wind power base 200 with the first output end of the offshore hydrogen ammonia base 100, thereby not only providing offshore wind power resources, but also enabling the offshore wind power base 200 to be connected to a hydrogen electrolyzer to produce hydrogen in the case of isolated grid operation and frequent wind power generation, thereby providing an important and clean source of raw materials for the subsequent offshore hydrogen ammonia base to prepare methanol, etc.

[0051] Optionally, in one embodiment of the present application, the offshore wind power base 200 includes: a plurality of grid-type wind turbines and a wind turbine control device.

[0052] Among them, the wind turbine control device and multiple grid-type wind turbines are connected in parallel, and are used to obtain the wind speed information corresponding to the offshore wind power base 200 during normal operation, and determine the type of grid-type wind turbine to be operated based on the wind speed information, and distribute the active power and reactive power generated by multiple wind turbines in the offshore wind power base 200 through the wind turbine control device. Among them, the types of grid-type wind turbines include doubly fed wind turbines and direct drive wind turbines.

[0053] It should be noted that the offshore wind power base 200 in the embodiment of the present application can be composed of multiple doubly fed and direct-drive wind turbines and wind turbine control devices connected in parallel. During normal operation, the embodiment of the present application can decide whether to operate a doubly fed wind turbine or a direct-drive wind turbine through the wind turbine control device based on the corresponding wind speed data; the wind turbine control device distributes the active power and reactive power generated by multiple wind turbines in the wind power base. Among them, the doubly fed and direct-drive wind turbines in the wind power base in the embodiment of the present application are all equipped with grid-type energy storage converters, which are grid-type wind turbines.

[0054] Therefore, the embodiment of the present application constructs an offshore wind power base 200 through multiple grid-type wind turbines and wind turbine control devices, thereby providing important technical support for the generation of offshore wind power energy.

[0055] The input end of the offshore photovoltaic base 300 is connected to the second output end of the offshore hydrogen ammonia base 100 to provide offshore photovoltaic resources and connect to a hydrogen electrolyzer to produce hydrogen in isolated grid operation and multiple photovoltaic power generation conditions.

[0056] The input end of the inverter station 400 is connected to the output end of the offshore photovoltaic base 300 and is used to convert the direct current output by the offshore photovoltaic base 300 into alternating current.

[0057] Furthermore, the embodiments of the present application can also construct an offshore photovoltaic base 300 to provide offshore photovoltaic resources and output the corresponding alternating current of the offshore photovoltaic base 300 through an inverter; in addition, when the grid is isolated and photovoltaic power is high, the offshore photovoltaic base 300 is connected to a hydrogen electrolyzer to produce hydrogen.

[0058] Optionally, in one embodiment of the present application, the offshore photovoltaic base 300 includes: photovoltaic panels for acquiring solar energy resources of the offshore photovoltaic base 300 and converting the solar energy resources into offshore photovoltaic resources.

[0059] It can be understood that the offshore photovoltaic base 300 in the embodiment of the present application is mainly constructed by photovoltaic panels, so that the solar energy resources of the offshore photovoltaic base 300 can be obtained and converted into offshore photovoltaic resources.

[0060] Therefore, the embodiment of the present application constructs an offshore photovoltaic base through photovoltaic panels, thereby ensuring the realization of offshore wind and solar energy complementarity.

[0061] The offshore hydrogen ammonia base 100 is used to utilize the excess electricity and hydrogen of the offshore wind power base 200 and the offshore photovoltaic base 300 to prepare hydrogen ammonia, so as to carry out multi-energy complementary power generation with the offshore wind power base 200 and the offshore photovoltaic base 300, while providing raw material supply for target ships and distributed power generation units.

[0062] In the actual implementation process, Figure 2 As shown, under isolated grid operation, the offshore hydrogen ammonia base 100 in the embodiment of the present application can use the green hydrogen produced by the offshore wind and solar base (i.e., the offshore wind power base 200 and the offshore photovoltaic base 300) to react with nitrogen to produce ammonia, and transport it from the offshore hydrogen ammonia base to inland through a pipeline for use as a distributed power generation ammonia raw material; in addition, the offshore hydrogen ammonia base 100 can also use the green hydrogen produced by the offshore wind and solar base and the captured carbon dioxide to jointly produce methanol, which can be directly used for raw material supply of offshore ships.

[0063] Therefore, the embodiments of the present application can achieve multi-energy complementarity by utilizing the offshore hydrogen ammonia base 100, and can utilize the excess electricity of the offshore wind and solar base to prepare hydrogen ammonia.

[0064] The offshore wind and solar base energy storage power station 500 has a first input terminal connected to the output terminal of the offshore wind power base 200, a second input terminal connected to the output terminal of the inverter station 400, and an output terminal of the offshore wind and solar base energy storage power station 500 connected to a preset first busbar, which is used to smooth the AC power output generated by the offshore wind power base 200 and the offshore photovoltaic base 300, and output or store corresponding active power and reactive power according to the output power of the offshore wind power base 200 and the offshore photovoltaic base 300 to balance the target power system power.

[0065] The booster station 600 has its input end connected to the first busbar, and its output end connected to the preset second busbar, and is used to increase the AC power output from the offshore wind and solar base energy storage power station to the target voltage level.

[0066] In an embodiment of the present application, the second input terminal and the output terminal of the offshore wind-solar base energy storage station 500 are respectively connected to the output terminal of the inverter station 400 and the first busbar (i.e., the 35KV busbar) to smooth the AC power output generated by the offshore wind-solar base to obtain AC power that is close to sinusoidal. At the same time, the offshore wind-solar base energy storage station 500 can also output or store corresponding active power and reactive power according to the active power and reactive power output by the offshore wind-solar base (i.e., the offshore wind power base 200 and the offshore photovoltaic base 300). For example, when the active power and reactive power output by the offshore wind-solar base are large, the offshore wind-solar base energy storage station 500 can store the corresponding active power and reactive power. When the active power and reactive power output by the offshore wind-solar base are small, the offshore wind-solar base energy storage station 500 can output a certain amount of active power and reactive power, thereby achieving power balance in the target power system. In addition, in an embodiment of the present application, the offshore wind-solar base energy storage station 500 can also adjust the reactive power to quickly adjust the voltage.

[0067] Furthermore, the embodiment of the present application can also connect the input and output ends of the booster station 600 to the first busbar and the second busbar (i.e., the 220KV busbar), respectively, so as to increase the AC voltage level output by the offshore wind and solar base energy storage power station 500 to a preset level (i.e., the target voltage level).

[0068] Optionally, in one embodiment of the present application, the offshore wind and solar base energy storage power station 500 includes: a lithium iron phosphate and lithium titanate battery compartment composed of a preset lithium iron phosphate battery system, a lithium titanate battery system, a battery control cabinet, a battery power supply cabinet, a battery management system, an energy management system and a grid-following converter, which is used to smooth the output of the offshore wind power base and the offshore photovoltaic base, and balance the system active power and reactive power, wherein the lithium iron phosphate battery system and the lithium titanate battery system include multiple groups of lithium iron phosphate and lithium titanate battery packs connected in parallel, and the lithium iron phosphate and lithium titanate battery packs are composed of lithium iron phosphate batteries and lithium titanate batteries connected in series.

[0069] It should be noted that the offshore wind and solar base energy storage power station 500 in the embodiment of the present application includes lithium iron phosphate and lithium titanate battery compartments, which mainly include lithium iron phosphate battery systems, lithium titanate battery systems, battery control cabinets, battery power supply cabinets, battery management systems, energy management systems and grid-following converters.

[0070] In an embodiment of the present application, the lithium iron phosphate battery system and the lithium titanate battery system include multiple groups of lithium iron phosphate and lithium titanate battery packs connected in parallel, and the lithium iron phosphate and lithium titanate battery packs can be composed of lithium iron phosphate batteries and lithium titanate batteries connected in series; in the actual implementation process, the lithium iron phosphate and lithium titanate battery compartments in the embodiment of the present application can be used to smooth the output of the wind and solar base, balance the system active power and reactive power, and adjust the reactive power through the offshore wind and solar base energy storage power station 500 to achieve rapid voltage regulation.

[0071] Therefore, the embodiment of the present application uses an offshore wind and solar base energy storage power station composed of lithium iron phosphate and lithium titanate battery compartments to smooth the output of the wind and solar base, and balances the system active power and reactive power by adjusting the active power and reactive power of the battery pack in the battery compartment.

[0072] The input end of the grid-type energy storage phase-adjusting power station 700 is connected to the second busbar, and the output end of the grid-type energy storage phase-adjusting power station 700 is connected to the preset third busbar. It is used to perform preset grid-type and phase-adjusting operations on the AC power of the target voltage level to generate the target AC power after grid-type, and perform corresponding broadband impedance scanning operations on the target AC power to obtain the full network impedance, and based on the full network impedance, determine whether the target AC power has an oscillation risk.

[0073] The input end of the broadband oscillation control and prevention device 800 is connected to the third busbar, and is used to perform preset broadband oscillation prevention operations when there is an oscillation risk in the target AC power. Among them, the grid-type static compensator group and grid-type unified power flow controller group in the broadband oscillation control and prevention device have impedance adjustment functions and grid-type properties.

[0074] Afterwards, the embodiment of the present application can also be connected to the third busbar (i.e., the 500KV busbar) through the grid-type energy storage phase-adjustment power station 700, which can be used to perform grid-building and phase-adjustment operations to obtain the target AC power after grid-building (i.e., AC power with a preset frequency and grid-building properties), and perform oscillation detection on the target AC power.

[0075] As a feasible method, the embodiment of the present application can utilize the broadband impedance scanning function of the grid-type energy storage phase modulation controller to scan the full network impedance from 0.1 to 2500 Hz to obtain the full network impedance, so as to judge whether there is an oscillation risk based on the full network impedance through judgment criteria.

[0076] Furthermore, the embodiment of the present application may further include a broadband oscillation control and prevention device 800 connected to the third busbar, so as to perform broadband oscillation prevention operations when there is an oscillation risk in the target AC power.

[0077] Optionally, in one embodiment of the present application, the grid-type energy storage phase-adjustment power station 700 includes: multiple multi-element energy storage units, multiple synchronous phase regulators, synchronous phase regulator groups, multiple grid-type energy storage converters, multiple energy storage modules, energy storage module groups and multiple grid-type energy storage phase-adjustment controllers.

[0078] Among them, the synchronous phase condenser group is composed of multiple synchronous phase condensers connected in series; the input ends of multiple grid-type energy storage inverters are connected to the output ends of multiple multi-element energy storage units, which are used to use the preset grid control strategy to provide target AC power with preset frequency and grid properties; multiple energy storage modules are composed of multiple multi-element energy storage units and multiple grid-type energy storage inverters; the energy storage module group is composed of multiple energy storage modules connected in series.

[0079] The output end of each phase of the multiple grid-type energy storage phase-modulation controllers is connected to the input end of the synchronous phase condenser group, and the input end of each phase of the grid-type energy storage phase-modulation controller is connected to the energy storage module group, which is used to coordinate and control the energy storage module group and the synchronous phase condenser group to perform primary, secondary, and tertiary frequency modulation, voltage regulation, as well as active power, reactive power and short-circuit capacity regulation operations.

[0080] It should be noted that if Figure 3 As shown, the grid-type energy storage phase-modulation power station 700 (I) in the embodiment of the present application is mainly composed of N energy storage modules consisting of N multi-element energy storage units and N grid-type energy storage converters, N synchronous phase regulators and grid-type energy storage phase-modulation controllers for each phase.

[0081] Among them, the multi-element energy storage unit mainly includes a sodium ion battery group, a supercapacitor group and a hydrogen storage device; the grid-type energy storage converter can use grid control to provide AC power with a preset frequency and grid-type properties (i.e., the target AC power after grid construction); when connected at a low short-circuit ratio, the synchronous phase condenser in the grid-type energy storage phase-adjusting power station (I) can be used to provide short-circuit capacity to improve system stability; such as Figure 3 As shown, the synchronous condenser (I) represents the I-th synchronous condenser, the synchronous condenser (N) represents the N-th synchronous condenser, and its sodium ion battery group, supercapacitor group, hydrogen storage device and grid-type energy storage converter have similar meanings and are not repeated here.

[0082] In addition, if Figure 2 As shown, the grid-type energy storage phase-modulation controller in the embodiment of the present application can control the multi-element energy storage unit, the grid-type energy storage converter and the synchronous phase regulator to coordinate the multi-element energy storage unit to provide active power in response to the power grid for primary, secondary and tertiary frequency modulation, coordinate multiple energy storage modules and synchronous phase regulators to perform frequency modulation, voltage regulation, active power, reactive power and short-circuit capacity regulation.

[0083] Therefore, in the embodiment of the present application, the grid-type energy storage phase modulation controller can control the grid-type energy storage converter to adjust multiple preset parameters to perform primary frequency modulation, secondary frequency modulation, tertiary frequency modulation and voltage adjustment, and can adjust the active power and reactive power provided by the sodium ion battery, supercapacitor and hydrogen storage device.

[0084] Therefore, the embodiments of the present application construct a grid-type energy storage phase-modulation power station through multiple energy storage modules composed of multiple multi-energy storage units and multiple grid-type energy storage converters, multiple synchronous phase regulators and a grid-type energy storage phase-modulation controller, so that the grid-type energy storage control research of the offshore wind-solar-hydrogen-ammonia-alcohol multi-energy complementary base can be carried out under low short-circuit ratio access conditions, providing reliable technical guidance and basis for the optimization regulation and oscillation control of the power grid.

[0085] Optionally, in one embodiment of the present application, when low short-circuit ratio access is performed, a synchronous phase regulator in a grid-type energy storage phase-modulation power station is used to provide short-circuit capacity.

[0086] In the embodiment of the present application, the energy storage module group, the synchronous phase condenser group, and the energy storage phase modulation controller of each phase in the grid-type energy storage phase modulation power station are connected in the following manner: Figure 4 It is understood that in the case of low short-circuit ratio access, the embodiment of the present application can provide short-circuit capacity through the synchronous phase regulator in the grid-type energy storage phase-modulation power station, thereby improving system stability.

[0087] Optionally, in one embodiment of the present application, the multi-element energy storage unit includes: a sodium ion battery pack, a supercapacitor pack and a hydrogen storage device.

[0088] Among them, the supercapacitor group is used to provide inertia support for instantaneous energy storage.

[0089] A sodium ion battery pack is used to perform energy storage operations that meet a first preset time requirement.

[0090] The hydrogen storage device is used to perform energy storage operations that meet the second preset time requirement.

[0091] In the actual implementation process, Figure 3 As shown, the multi-element energy storage unit in the embodiment of the present application is mainly composed of a sodium ion battery group, a supercapacitor group and a hydrogen storage device.

[0092] Among them, the sodium ion battery group, supercapacitor group, and hydrogen storage device are connected in parallel and are all connected to a grid-type energy storage converter.

[0093] Supercapacitors can provide inertia support for instantaneous energy storage; sodium-ion battery packs can store energy for a short time (i.e., meeting the first preset time requirement); hydrogen storage devices can store energy for a long time (i.e., meeting the second preset time requirement); sodium-ion battery packs, supercapacitors and hydrogen storage devices can perform active power control, frequency control and voltage control through grid-type energy storage converters.

[0094] Therefore, the embodiment of the present application provides hardware support for electric energy storage by utilizing sodium ion battery packs, supercapacitor packs and hydrogen storage devices to form a multi-element energy storage unit, thereby ensuring the reliability of the subsequent construction of a grid-type energy storage phase-adjusting power station.

[0095] Optionally, in one embodiment of the present application, the broadband oscillation control and prevention device 800 includes: a virtual impedance control system, a meshed unified power flow controller group, and a meshed static compensator group.

[0096] Among them, the virtual impedance control system is used to determine whether increasing or decreasing the impedance will continue to cause oscillation when there is a risk of oscillation in the target AC power. When increasing or decreasing the impedance will not continue to cause oscillation, the preset PID controller parameters are adjusted to regulate the impedance.

[0097] The meshed unified power flow controller group and the meshed static compensator group are used to adjust the PID controller parameters in the case where increasing or decreasing the impedance continues to cause oscillation, so as to regulate the impedance until oscillation stops.

[0098] In the specific implementation process, the broadband oscillation control and prevention device mainly includes a virtual impedance control system, a grid-type unified power flow controller group and a grid-type static compensator group.

[0099] When the target AC power is likely to oscillate (i.e., there is a risk of oscillation), the embodiment of the present application may call a virtual impedance control system to determine whether the increased or decreased impedance (i.e., virtual impedance) will still cause oscillation; if it will still cause oscillation, the meshed static compensator group and the meshed unified power flow controller group are called to adjust the PID controller parameters to achieve virtual impedance regulation until oscillation stops; otherwise, there is no need to call the meshed static compensator group and the meshed unified power flow controller group.

[0100] Therefore, the embodiments of the present application construct a wide-band oscillation control and prevention device through a virtual impedance control system, a meshed unified power flow controller group and a meshed static compensator group, thereby realizing voltage, frequency, short-circuit capacity adjustment and inertial support, and can perform oscillation prevention and control.

[0101] Optionally, in one embodiment of the present application, the grid-type static compensator group and the grid-type unified power flow controller group have grid-type properties, and the voltage amplitude is adjusted by adjusting the reactive power in the grid-type static compensator group, and the voltage amplitude and phase angle are adjusted by adjusting the grid-type unified power flow controller group.

[0102] It should be noted that the meshed static compensator group and meshed unified power flow controller group in the embodiments of the present application not only have the impedance adjustment function, but also have meshing properties, and can achieve voltage amplitude adjustment and voltage phase angle adjustment by adjusting the reactive power in the meshed static compensator group and adjusting the meshed unified power flow controller group.

[0103] Therefore, the embodiments of the present application utilize a grid-type static compensator group and a grid-type unified power flow controller group with impedance adjustment function and grid-forming properties to achieve the purpose of adjusting the voltage amplitude and voltage phase angle, thereby achieving the purpose of optimizing the adjustment of the grid support and oscillation control.

[0104] The offshore wind-solar-hydrogen-ammonia base grid-building control system proposed in the embodiment of the present application includes an offshore hydrogen-ammonia base, an offshore wind power base, an offshore photovoltaic base, an inverter station, an offshore wind-solar base energy storage power station, a booster station, a grid-building energy storage phase-adjusting power station, and a wide-band oscillation control and prevention device. This allows research on grid-building energy storage control of offshore wind-solar-hydrogen-ammonia multi-energy complementary bases under low short-circuit ratio access and isolated grid operation, realizes voltage, frequency, short-circuit capacity adjustment and inertial support, and can perform oscillation prevention and control, thereby achieving the purpose of optimized regulation of power grid support and oscillation management; at the same time, it realizes multi-energy complementarity, improves energy utilization, and can prepare hydrogen-ammonia through green energy, reducing carbon emissions. This application uses offshore photovoltaic bases, inverter stations, offshore hydrogen ammonia bases, grid-type energy storage phase-adjustment power stations, offshore wind-solar base energy storage power stations, booster stations, etc. to conduct research on offshore wind-solar hydrogen storage ammonia multi-energy complementary base network control and broadband oscillation prevention and control methods under low short-circuit ratio access and isolated grid operation, thereby achieving multi-energy complementarity, improving energy utilization, and preparing hydrogen ammonia through green energy, reducing carbon emissions.

[0105] Secondly, the broadband oscillation prevention and control method of the offshore wind-solar hydrogen storage ammonia base network control system proposed in accordance with the embodiment of the present application is described with reference to the accompanying drawings.

[0106] Figure 5 This is a flow chart of a method for preventing and controlling broadband oscillations in a network control system of an offshore wind-solar-hydrogen-storage-ammonia-alcohol base provided in an embodiment of the present application.

[0107] like Figure 5 As shown, the broadband oscillation prevention and control method of the offshore wind-solar hydrogen storage ammonia base network control system includes the following steps:

[0108] In step S501, offshore wind power resources and offshore photovoltaic resources are provided by a preset offshore wind power base and offshore photovoltaic base, and in the case of isolated grid operation and frequent wind power generation, a preset hydrogen electrolyzer is connected to produce hydrogen.

[0109] In step S502, based on the preset offshore hydrogen ammonia base, hydrogen ammonia is prepared by utilizing the excess electricity and hydrogen of the offshore wind power base and the offshore photovoltaic base, so as to carry out multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base, while providing raw material supply for the target ship and distributed power generation units.

[0110] In step S503, the direct current output of the offshore photovoltaic base is converted into alternating current, and the AC power output generated by the offshore wind power base and the offshore photovoltaic base is smoothed. According to the output power of the offshore wind power base and the offshore photovoltaic base, the corresponding active power and reactive power are output or stored to balance the target power system power.

[0111] In step S504, the AC power output by the offshore wind and solar base energy storage power station is increased to a target voltage level, and preset grid construction and phase adjustment operations are performed on the AC power of the target voltage level through the grid construction type energy storage phase adjustment power station to generate the target AC power after grid construction, and a 0.1~2500HZ broadband impedance scanning operation is performed on the target AC power to obtain the full network impedance. Based on the full network impedance, it is determined whether the target AC power has an oscillation risk, so that when the target AC power has an oscillation risk, a preset broadband oscillation prevention and control operation is performed.

[0112] It should be noted that the above explanation of the embodiment of the offshore wind, solar, hydrogen storage, ammonia multi-energy complementary base network control device is also applicable to the broadband oscillation prevention and control method of the offshore wind, solar, hydrogen storage, ammonia base network control system of this embodiment, and will not be repeated here.

[0113] According to the broadband oscillation prevention and control method of the offshore wind-solar-hydrogen-storage-ammonia base network control system proposed in the embodiment of the present application, offshore wind power resources and offshore photovoltaic resources are provided by a preset offshore wind power base and an offshore photovoltaic base, and in the case of isolated grid operation and frequent wind power generation, a preset hydrogen electrolyzer is connected to prepare hydrogen; based on the preset offshore hydrogen-ammonia base, hydrogen-ammonia is prepared by utilizing the excess electricity and hydrogen of the offshore wind power base and the offshore photovoltaic base, so as to provide raw material supply for the target ship while carrying out multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base; the DC power output by the offshore photovoltaic base is converted into AC power; and the AC power output generated by the offshore wind power base and the offshore photovoltaic base is smoothed, and according to the offshore wind power base and the offshore photovoltaic base, the DC power output by the offshore wind power base and the offshore photovoltaic base is smoothed. The output power of the photovoltaic base is used to output or store the corresponding active power and reactive power to balance the target power system power. The reactive power can also be adjusted through the offshore wind and solar base energy storage power station to quickly adjust the voltage. Afterwards, the embodiment of the present application can increase the AC power output by the offshore wind and solar base energy storage power station to the target voltage level, and perform preset networking and phase adjustment operations on the AC power of the target voltage level through the grid-forming energy storage phase adjustment power station to generate the target AC power after networking, and perform corresponding broadband impedance scanning operations on the target AC power to obtain the full network impedance, and based on the full network impedance, determine whether the target AC power has an oscillation risk, so that when the target AC power has an oscillation risk, perform preset broadband oscillation prevention and control operations. This application uses offshore photovoltaic bases, inverter stations, offshore hydrogen ammonia bases, grid-type energy storage phase-adjustment power stations, offshore wind-solar base energy storage power stations, booster stations, etc. to conduct research on offshore wind-solar hydrogen storage ammonia multi-energy complementary base network control and broadband oscillation prevention and control methods under low short-circuit ratio access and isolated grid operation, thereby achieving multi-energy complementarity, improving energy utilization, and preparing hydrogen ammonia through green energy, reducing carbon emissions.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0115] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing a custom logical function or process step, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

Claims

1. An offshore wind-solar hydrogen storage ammonia alcohol base network control system, characterized in that: include: An offshore wind power base, wherein the input end of the offshore wind power base is connected to the first output end of the preset offshore hydrogen ammonia base, is used to provide offshore wind power resources, and is connected to a preset hydrogen electrolyzer to produce hydrogen in the case of isolated grid operation and frequent wind power generation; An offshore photovoltaic base, wherein the input end of the offshore photovoltaic base is connected to the second output end of the offshore hydrogen ammonia base, for providing offshore photovoltaic resources, and in the case of isolated grid operation and multiple photovoltaic power generation, connected to the hydrogen electrolyzer to produce hydrogen; An offshore hydrogen ammonia base is used to utilize excess electricity and hydrogen from the offshore wind power base and the offshore photovoltaic base to produce hydrogen ammonia, thereby performing multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base, while providing raw material supply for target ships and distributed power generation units; an inverter station, wherein the input end of the inverter station is connected to the output end of the offshore photovoltaic base, and is used to convert the direct current output by the offshore photovoltaic base into alternating current; An offshore wind and solar base energy storage power station, wherein a first input terminal of the offshore wind and solar base energy storage power station is connected to an output terminal of the offshore wind power base, a second input terminal of the offshore wind and solar base energy storage power station is connected to an output terminal of the inverter station, and an output terminal of the offshore wind and solar base energy storage power station is connected to a preset first busbar, and is used to smooth the AC power output generated by the offshore wind power base and the offshore photovoltaic base, and output or store corresponding active power and reactive power according to the output power of the offshore wind power base and the offshore photovoltaic base to balance the target power system power; A booster station, wherein the input end of the booster station is connected to the first busbar, and the output end of the booster station is connected to a preset second busbar, and is used to increase the AC power output by the offshore wind and solar base energy storage power station to a target voltage level; a grid-type energy storage phase-adjusting power station, wherein the input end of the grid-type energy storage phase-adjusting power station is connected to the second busbar, and the output end of the grid-type energy storage phase-adjusting power station is connected to a preset third busbar, and is configured to perform preset grid-type and phase-adjusting operations on the AC power of the target voltage level to generate a gridded target AC power, and perform a corresponding broadband impedance scanning operation on the target AC power to obtain a full network impedance, and based on the full network impedance, determine whether the target AC power has an oscillation risk; A wide-band oscillation control and prevention device, wherein the input end of the wide-band oscillation control and prevention device is connected to the third busbar, and is used to perform a preset wide-band oscillation prevention and control operation when the target AC power has the oscillation risk, wherein the grid-type static compensator group and the grid-type unified power flow controller group in the wide-band oscillation control and prevention device have impedance adjustment function and grid-type properties.

2. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The grid-type energy storage phase-adjusting power station includes: Multiple multi-energy storage units; Multiple synchronous condensers; A synchronous condenser group consisting of the plurality of synchronous condensers connected in series; A plurality of grid-type energy storage converters, wherein the input ends of the plurality of grid-type energy storage converters are connected to the output ends of the plurality of multi-element energy storage units, and are configured to provide target alternating current with a preset frequency and grid-type properties by using a preset grid-type control strategy; A plurality of energy storage modules consisting of the plurality of multi-element energy storage units and the plurality of grid-type energy storage converters; An energy storage module group consisting of the plurality of energy storage modules connected in series; Multiple grid-type energy storage phase-modulation controllers, the output end of each phase grid-type energy storage phase-modulation controller is connected to the input end of the synchronous phase condenser group, and the input end of each phase grid-type energy storage phase-modulation controller is connected to the energy storage module group, for coordinating and controlling the energy storage module group and the synchronous phase condenser group to perform primary, secondary, and tertiary frequency modulation, voltage regulation, and active power, reactive power and short-circuit capacity regulation operations.

3. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 2 is characterized in that: The multi-element energy storage unit comprises: Supercapacitor group, used to provide inertia support for instantaneous energy storage; A sodium ion battery pack, configured to perform energy storage operations that meet a first preset duration requirement; The hydrogen storage device is used to perform energy storage operations that meet the second preset time requirement.

4. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 2 is characterized in that: When connected at a low short-circuit ratio, the synchronous phase regulator in the grid-type energy storage phase-modulation power station is used to provide short-circuit capacity.

5. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The offshore wind power base includes: Multiple grid-type fans; A wind turbine control device, wherein the wind turbine control device is connected in parallel with the multiple grid-type wind turbines, and is used to obtain wind speed information corresponding to the offshore wind power base during normal operation, and determine the type of grid-type wind turbine to be operated based on the wind speed information, and distribute the active power and reactive power generated by the multiple wind turbines in the offshore wind power base through the wind turbine control device, wherein the types of grid-type wind turbines include doubly fed wind turbines and direct drive wind turbines.

6. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The offshore photovoltaic base includes: Photovoltaic panels are used to obtain solar energy resources of the offshore photovoltaic base and convert the solar energy resources into offshore photovoltaic resources.

7. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The offshore wind and solar base energy storage power station includes: The lithium iron phosphate and lithium titanate battery compartment, which is composed of a preset lithium iron phosphate battery system, a lithium titanate battery system, a battery control cabinet, a battery power supply cabinet, a battery management system, an energy management system and a grid-following converter, is used to smooth the output of the offshore wind power base and the offshore photovoltaic base, and balance the system's active power and reactive power. The lithium iron phosphate battery system and the lithium titanate battery system include multiple groups of lithium iron phosphate and lithium titanate battery packs connected in parallel, and the lithium iron phosphate and lithium titanate battery packs are composed of lithium iron phosphate batteries and lithium titanate batteries connected in series.

8. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The broadband oscillation control and prevention device comprises: a virtual impedance control system, configured to determine, when the target AC current has the risk of oscillation, whether increasing or decreasing the impedance will continue to cause oscillation, wherein, when increasing or decreasing the impedance does not continue to cause oscillation, adjusting preset PID controller parameters to regulate the impedance; The grid-type unified power flow controller group and the grid-type static compensator group are used to adjust the PID controller parameters to regulate the impedance until the oscillation stops when increasing or decreasing the impedance continues to cause oscillation.

9. The offshore wind-solar hydrogen storage ammonia alcohol base network control system according to claim 1 is characterized in that: The grid-type static compensator group and the grid-type unified power flow controller group have grid-type properties. The voltage amplitude is adjusted by adjusting the reactive power in the grid-type static compensator group, and the voltage amplitude and phase angle are adjusted by adjusting the grid-type unified power flow controller group.

10. A method for preventing and controlling broadband oscillations in a network control system for an offshore wind-solar hydrogen storage ammonia alcohol base, characterized in that: The following steps are involved: Provide offshore wind power resources and offshore photovoltaic resources through pre-set offshore wind power bases and offshore photovoltaic bases, and connect pre-set hydrogen electrolyzers to produce hydrogen in the case of isolated grid operation and frequent wind power generation; Based on a preset offshore hydroamino alcohol base, the excess electricity and hydrogen from the offshore wind power base and the offshore photovoltaic base are utilized to produce hydroamino alcohol, thereby achieving multi-energy complementary power generation with the offshore wind power base and the offshore photovoltaic base, while providing raw material supply for target ships and distributed power generation units; Converting the direct current output of the offshore photovoltaic base into alternating current (AC) and smoothing the AC output of the offshore wind power base and the offshore photovoltaic base. Based on the output power of the offshore wind power base and the offshore photovoltaic base, the system outputs or stores corresponding active power and reactive power to balance the target power system power. The AC power output by the offshore wind and solar base energy storage power station is increased to a target voltage level. The AC power at the target voltage level is subjected to preset grid construction and phase adjustment operations through a grid-type energy storage phase adjustment power station to generate the target AC power after grid construction. A 0.1-2500 Hz broadband impedance scanning operation is performed on the target AC power to obtain the full network impedance. Based on the full network impedance, it is determined whether the target AC power has an oscillation risk. If the target AC power has the oscillation risk, a preset broadband oscillation prevention and control operation is performed.

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