CN110649861B - Multi-energy complementary offshore energy integrated power generation system - Google Patents

Multi-energy complementary offshore energy integrated power generation system Download PDF

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CN110649861B
CN110649861B CN201910869904.0A CN201910869904A CN110649861B CN 110649861 B CN110649861 B CN 110649861B CN 201910869904 A CN201910869904 A CN 201910869904A CN 110649861 B CN110649861 B CN 110649861B
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energy
energy storage
power generation
voltage
battery pack
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CN110649861A (en
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金安君
李智豪
罗祥富
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Dong'ao Xinda Smart Energy Technology (Zhuhai) Co.,Ltd.
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Zhuhai Lianteng New Energy Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/106—Ammonia
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D3/00—Wind motors with rotation axis substantially perpendicular to the air flow entering the rotor 
    • F03D3/06—Rotors
    • F03D3/062—Rotors characterised by their construction elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/007—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations the wind motor being combined with means for converting solar radiation into useful energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/10—Combinations of wind motors with apparatus storing energy
    • F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
    • F03G7/05—Ocean thermal energy conversion, i.e. OTEC
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/10—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power including a supplementary source of electric power, e.g. hybrid diesel-PV energy systems
    • H02S10/12—Hybrid wind-PV energy systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/138—Water desalination using renewable energy
    • Y02A20/141—Wind power
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/138—Water desalination using renewable energy
    • Y02A20/142—Solar thermal; Photovoltaics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Oceanography (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a multi-energy complementary offshore energy integrated power generation system, which comprises a wind energy power generation system, a photovoltaic power generation system, an ocean temperature difference energy power generation system, an energy storage system and a seawater desalination system, wherein the output voltage of the ocean temperature difference energy power generation system is subjected to voltage stabilization, voltage regulation and constant current treatment through an AC/DC bidirectional inverter, is output as stable voltage, and is charged to an energy storage battery pack through a charging and discharging module; when the AC/DC bidirectional inverter is used for charging the energy storage battery pack, if a load needs to provide electric energy, the AC/DC bidirectional inverter converts the electric energy in another way through the DC/AC inverter and outputs the electric energy suitable for the use requirement of the load to be supplied to the load.

Description

Multi-energy complementary offshore energy integrated power generation system
Technical Field
The invention relates to the technical field of electric energy sources, in particular to a multi-energy complementary offshore energy integrated power generation system.
Background
Ocean energy is a green renewable energy source with huge energy, and countries with ocean resources in the world strive to develop ocean energy resources and promote the development of new energy technology related to ocean energy. The ocean thermal energy power generation is one of new energy technologies for ocean energy development and utilization.
Current ocean thermal energy generation Systems (OTECs) include open cycle systems, closed cycle systems, and hybrid cycle systems. The open circulation system consists of flash evaporator, steam turbine, condenser and sea water pump, and the working process includes pumping warm sea water into the flash evaporator to evaporate part of sea water to produce steam, expanding the steam in the turbine to produce work and driving the generator to generate electricity, and liquefying the work in the condenser to form sea water. The closed circulation system takes a working medium as a circulation medium, and a working medium pump is added, so that the working medium circularly flows in the system to drive a turbine to rotate, and a generator generates electricity. The difference between the hybrid cycle system and the closed cycle system is only in the evaporator section. Its working principle is that firstly the warm sea water is vaporized into steam in the flash evaporator, then the steam is used to heat working medium, and the vaporization temperature of working medium is raised.
However, the ocean thermal energy is used for generating electricity by single ocean thermal energy, the energy utilization form is single, and the thermodynamic cycle efficiency is low and is less than 4%.
The ocean temperature difference energy power generation is characterized in that the temperature difference of about 20 (DEG C) is formed between ocean surface layer warm water (the temperature is generally 25-28 ℃) and cold seawater (the temperature is generally 3-6 ℃) 1000 meters away from the surface layer water, and by means of a special ocean temperature difference energy power generation device, a circulating working medium in the power generation device is enabled to pass through the circulation process of an evaporator and a condenser by means of the temperature difference, so that an impeller of a turbine is driven to rotate to generate mechanical energy, and then the mechanical energy is converted into electric energy to generate power. The special ocean temperature difference energy power generation device comprises a condenser, an evaporator, a turbine, a generator, a water suction pump, a working medium circulating pump, a connecting pipeline, cold seawater, warm seawater, a working medium (such as ammonia) with a low boiling point and the like.
The condenser is used for transmitting low temperature to the condenser by utilizing low-temperature seawater at the bottom layer of the sea, for example, ammonia high-temperature gaseous working medium is cooled and condensed into liquid after passing through the condenser, and is conveyed to the evaporator through the conveying pump; the evaporator is used for transmitting the heat of the seawater with relatively high temperature on the surface layer of the ocean to the evaporator, and the evaporator uses the high temperature transmitted by the high-temperature seawater to absorb heat of the low-boiling-point working medium transmitted by the condenser and evaporate the low-boiling-point working medium into a gas state. Because the working medium is converted into a gas state from a liquid state, the volume of the working medium is rapidly expanded, the turbine impeller is further pushed to rotate, then the kinetic energy generated by the rotation of the turbine impeller is transmitted to the generator rotor, and the generator rotor obtains the kinetic energy to generate electricity.
China has huge energy of ocean temperature difference energy power generation potential, so that considerable electric energy can be obtained by utilizing the ocean temperature difference energy to generate power. The electric energy obtained by the ocean temperature difference energy power generation device is scientifically managed, stored and efficiently used, and an energy storage technical scheme of the ocean temperature difference energy power generation electric energy is provided.
The basic principle of the ocean temperature difference energy power generation system is that ocean surface temperature seawater is utilized to heat certain low boiling point working media and vaporize the working media, or the seawater is vaporized through pressure reduction to drive a steam turbine to generate power. Meanwhile, the dead steam after doing work is condensed by utilizing cold seawater extracted from the seabed so as to be changed into liquid again, thereby forming a circulating system. Ocean thermal energy power generation has been in history for more than one hundred years, and early french scientists have experimentally verified the feasibility of ocean thermal energy power generation, but due to technical difficulties and problems, the ocean thermal energy power generation was not promoted by countries such as japan in the united states until 1973 after the oil crisis. In 1926, the open cycle system was designed by the french scientist claude, and in 1964, the anderson father and son proposed the closed cycle power generation system, and then the hybrid cycle system was proposed by the developers. However, a patent of a hybrid ocean thermal energy power generation system integrating various energy sources has not been proposed.
An ocean temperature difference energy power generation system is designed in Chinese patent CN 201810223599.3. China has wide ocean amplitude, huge ocean energy reserves and the same huge ocean temperature difference energy reserves. However, at present, domestic ocean temperature difference energy power generation is still in an experimental stage, and no ocean temperature difference energy power generator set and an energy storage management system which are really put into operation exist, particularly a high-power generator set and a high-capacity electric energy storage device which reach 3000 KW.h.
An implementation method of multi-energy complementary ubiquitous power and high-power distributed civil power supply equipment by taking ocean energy as reference energy. In an OTEC device with megawatt total power, 1/2 of OTEC is generally set for solar (photovoltaic) power generation and wind power generation with multi-energy supplement; the stored energy is about the total power generation of one day of total output. Such as; comprehensively utilizing a total-1 MW-scale ocean thermal energy power generation system which is characterized by multi-energy complementation and comprehensive utilization; the energy storage design can be selected to be 5MW-h, and 10 tons of purified water per day (the water yield of the equipment is 1 to 50 tons per day) can be optimally produced.
The disadvantages of the prior art are mainly reflected in:
1) the energy utilization form is single, only ocean temperature difference energy is adopted, and clean energy such as wind energy, solar energy and the like is not utilized.
2) The thermal cycle efficiency of the ocean temperature difference energy power generation system is low and is generally less than 4%.
3) This conventional technique is slow to develop: power amplification spreads slowly. (the first generation of OTEC was advanced by france in 1926);
4) the experimental results of ocean temperature difference energy power generation in China show that the conversion rate is low, is less than 4% internationally, and is typically only 1-3%;
5) at present, commercialization is not realized at home, and the technology is continuously improved, so that the electric energy storage technology and the electric energy storage device which are suitable for the technology are advanced innovation;
6) the power generation of the previous ocean temperature difference energy power generation experimental project is small, and the technology is continuously perfected in all aspects;
7) in the previous ocean temperature difference energy power generation experiment, the matching of an electric energy storage technology and a control system can be further improved.
Disclosure of Invention
The invention aims to: a multi-energy complementary offshore energy integrated power generation system is provided.
The technical scheme of the invention is as follows:
the utility model provides a complementary marine energy integration power generation system of multipotency, includes wind power generation system, photovoltaic power generation system, ocean thermoelectric energy power generation system to be equipped with energy storage system, sea water desalination, wherein:
the wind power generation system adopts four universal wind power generators which are respectively arranged around the offshore power generation platform, and the universal wind power generators adopt arc-shaped blades;
the photovoltaic power generation system adopts a third-generation perovskite solar panel, and the solar panel is arranged on the top of a marine power generation platform and the top of a wind driven generator;
the ocean temperature difference energy power generation system adopts a closed circulation system and takes ammonia as a working medium; liquid ammonia is stored in an ammonia storage tank and pumped into a pipeline through a working medium pump, the pipeline heats liquid ammonia for the first time through a flash evaporator filled with warm seawater to gasify the liquid ammonia, then a return pipeline passes through a solar energy concentrating disc, solar energy heats the return pipeline for the second time, the temperature of ammonia steam entering a turbine reaches the highest temperature, the pressure of ammonia reaches the maximum, high-pressure ammonia drives blades of the turbine to rotate, and an impeller shaft of the turbine is connected with a generator to generate electricity; the ammonia vapor enters a condenser after exiting the turbine;
the seawater desalination system is arranged in the condenser, cold seawater is pumped into the cold water pool through a cold water pump, steam flowing through the turbine is cooled and liquefied through the cold water pool through a pipeline, the cold water absorbs heat, is evaporated and evaporated, and a condensing plate is arranged at the top of the cold water pool and is used for condensing evaporated fresh water and liquefying ammonia vapor into liquid ammonia;
the energy storage system comprises two parts, wherein the first part is an energy storage box consisting of an energy storage battery pack and used for storing redundant electric quantity of the system; the second part is a warm seawater energy storage tank, and surface seawater is pumped into hot water of the flash evaporator to heat working medium in the daytime and then stored in the warm seawater energy storage tank for use at night.
Further, the output voltage of the ocean temperature difference energy power generation system is subjected to voltage stabilization, voltage regulation and constant current treatment through an AC/DC bidirectional inverter, is output as stable voltage, and is supplied to an energy storage battery pack for charging and load power utilization.
Further, the AC/DC bidirectional inverter device converts electric energy output by the ocean temperature difference energy generator into high-voltage constant-current DC electric energy, the energy storage battery pack is charged through the charging and discharging module, and when the electric quantity of the battery pack reaches a set upper limit, the charging is stopped; when the AC/DC bidirectional inverter is used for charging the energy storage battery pack, if a load needs to provide electric energy, the AC/DC bidirectional inverter simultaneously converts the electric energy in another circuit through the DC/AC inverter and outputs the electric energy suitable for the use requirement of the load, and the electric energy is supplied to the load for use.
Furthermore, the output voltage of the AC/DC bidirectional inverter is designed according to the combination scheme and the capacity value of the energy storage battery pack, and is greater than the voltage of the energy storage battery pack and is added with a float charging voltage value.
Furthermore, the AC/DC bidirectional inverter and the DC/AC inverter output end are connected with a switch and a safety device and then are connected with an electric appliance power supply circuit; and a charging and discharging management intelligent system is connected between the AC/DC bidirectional inverter and the energy storage battery pack to perform charging, discharging management and protection on the energy storage battery pack.
Furthermore, the intelligent charging and discharging management system adjusts the appropriate voltage and the appropriate constant current output by the AC/DC bidirectional inverter according to the combination mode of the energy storage battery to charge the energy storage battery pack, collects the voltage, the capacity, the charging current and the temperature data of each unit battery in the process, adjusts the charging voltage and the charging current of each unit battery in the circuit according to the equalizing charging rule, and stops continuously charging when the voltage of each unit battery reaches the upper limit of the charging voltage.
Furthermore, when the energy storage battery pack discharges, voltage, capacity, charging current and temperature data of each unit battery are also acquired and controlled by a discharge management system, and when the voltage of each unit battery drops to the lower limit of the voltage in the discharging process, discharging is stopped.
Further, when the system detects that the current reaches a limit value in the charging and discharging processes of the energy storage battery pack, the charging and discharging are stopped; when the system detects the short circuit in the charging and discharging processes of the energy storage battery pack, the circuit is disconnected; when the system detects that the temperature of a certain monitoring point exceeds a limit value, the disconnection circuit stops the work of the related power-related device.
Furthermore, the energy storage battery pack is connected with a power grid to transmit electric energy, and converts a DC power supply into AC power required by grid connection after passing through a DC/AC inverter and phase-locked frequency conversion.
Furthermore, the energy storage battery pack is connected to the grid to transmit electric energy, and is connected to an electric energy meter to be measured so as to count electric quantity.
The invention has the advantages that:
1. according to the scheme of the multi-energy complementary offshore energy integrated power generation system, the energy storage system is adopted to store the electric quantity of the redundant load power consumption demands generated by the wind energy power generation system, the photovoltaic power generation system and the ocean temperature difference energy power generation system so as to output electric energy to the load when the load power consumption is larger than the generated energy, and therefore the problem of comprehensive and efficient utilization of energy is solved. The scheme can realize the storage management of the ocean temperature difference energy power generation electric energy with the capacity of more than 50KW.h, and realize the effective and full utilization of the electric energy; the intelligent management and scientific distribution are carried out on the ocean thermoelectric energy power generation.
2. The scheme of the invention integrates multi-energy complementation of more energy forms, fully utilizes offshore energy, and couples a light energy power generation system, a wind energy power generation system and an ocean temperature difference energy power generation system.
3. In the scheme of the invention, in the ocean temperature difference energy power generation system, a solar energy light-gathering disk is arranged at the inlet of the turbine, and the steam (or ammonia for closed loop) entering the turbine is heated by utilizing solar energy, so that the temperature difference is generated and the thermoelectric conversion efficiency is improved.
4. The scheme of the invention adopts a computer to intelligently manage and control energy storage, monitor the voltage, current, temperature and the like of an input end and an output end in real time, manage and control the output control instruction of each index exceeding a standard range, and enable each parameter to run in a specified range, otherwise, adopt control measures to limit (change) current, limit (change) voltage, interrupt delivery, transmit and the like;
5. the scheme of the invention adopts a computer intelligent management system, can monitor and record various index data in real time, and provides data query and archiving.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of a multi-energy complementary offshore energy integrated power generation system;
FIG. 2 is a schematic view of a cambered blade of a universal wind turbine;
FIG. 3 is a schematic diagram of the structure of an ocean thermoelectric power generation system;
FIG. 4 is a schematic diagram of a battery management system;
fig. 5 is a schematic diagram of the grid-connected power transmission system.
Detailed Description
As shown in figure 1, the multi-energy complementary offshore energy integrated power generation system comprises a wind energy power generation system, a photovoltaic power generation system, an ocean temperature difference energy power generation system, an energy storage system and a seawater desalination system, and is mainly characterized in that energy in various forms such as wind energy, light energy and ocean temperature difference energy is integrated on an ocean platform, and the energy storage system and the seawater desalination system are arranged. Described separately below.
The wind power generation system adopts four universal wind power generators which are respectively arranged on the periphery of an offshore power generation platform, the universal wind power generators adopt arc-shaped blades, and wind in any direction can rotate the blades as shown in figure 2, so that the generators are driven to generate power.
A photovoltaic power generation system adopts a third generation perovskite solar panel, and the photoelectric conversion efficiency of the perovskite solar panel is up to 23%. The solar cell panel is arranged on the top of the offshore power generation platform and the top of the wind driven generator; the maximum area collects solar energy, thereby improving the utilization efficiency of energy.
As shown in FIG. 3, the ocean thermal energy power generation system adopts a closed circulation system and takes ammonia gas as a working medium; liquid ammonia is stored in an ammonia storage tank and pumped into a pipeline through a working medium pump, the pipeline heats liquid ammonia for the first time through a flash evaporator filled with warm seawater to gasify the liquid ammonia, then a return pipeline passes through a solar energy concentrating disc, solar energy heats the return pipeline for the second time, the temperature of ammonia steam entering a turbine reaches the highest temperature, the pressure of ammonia reaches the maximum, high-pressure ammonia drives blades of the turbine to rotate, and an impeller shaft of the turbine is connected with a generator to generate electricity; the ammonia vapor exits the turbine and enters a condenser.
The seawater desalination system is arranged in the condenser, cold seawater is pumped into the cold water pool through a cold water pump, vapor flowing through the turbine is cooled and liquefied through the cold water pool through a pipeline, the cold water absorbs heat, is evaporated and evaporated, and a condensing plate is arranged at the top of the cold water pool and is used for condensing evaporated fresh water and liquefying ammonia vapor into liquid ammonia.
The energy storage system comprises two parts, wherein the first part is an energy storage box consisting of an energy storage battery pack and used for storing redundant electric quantity of the system; the second part is a warm seawater energy storage box, the temperature of the surface seawater is higher in the daytime, and the hot water pumped into the flash evaporator still has higher temperature after heating the working medium, and the hot water is stored in the warm seawater energy storage box for use at night. The energy storage battery pack is used for storing electric energy transmitted by the generator set, providing electric energy output for a load and providing electric energy transmission for a power grid. The charging and discharging management of the energy storage battery pack is provided with a hardware charging and discharging management module, so that overvoltage, overcurrent, high temperature, short-circuit protection, equalizing charging and the like are avoided during charging and discharging; meanwhile, charging and discharging management software is equipped to timely monitor main indexes such as electric quantity, voltage, charging and discharging current, temperature and the like of the unit battery and the battery pack, corresponding processing instructions are immediately sent to abnormal indexes, and the component receiving the instructions acts according to the instruction requirements, so that the safe operation of the energy storage battery pack and the high efficiency of power utilization are ensured; the energy storage battery pack is formed by combining multi-unit high-efficiency lithium iron phosphate batteries (other types of lithium batteries can also be used), and the combination mode is a mode of series connection, parallel connection or series-parallel combination according to different requirements. No matter what kind of combination of mode, all there is data monitoring and management and control, makes its normal even running.
The energy storage battery pack has the function of storing and transferring electric energy in the operation process. When the ocean temperature difference energy generator works, the energy storage battery pack receives electricity generated by the generator for temporary storage, and when the stored electricity reaches a set value interval, grid connection is started to transmit electric energy; and meanwhile, when the connected load needs to supply power and the electric energy output by the ocean temperature difference energy power generation equipment is not enough to meet the power utilization requirement of the load, the energy storage battery pack discharges outwards to supply power to the load. The whole charging and discharging process is protected, managed and controlled by a special functional unit, so that the whole system is ensured to run safely, efficiently, balancedly and durably.
The voltage, current and electricity type required by the output electricity of the ocean temperature difference energy power generation device and the charging of the energy storage battery pack cannot be completely matched, and the output electricity generated by the ocean temperature difference energy power generation needs to be output into electricity meeting the charging requirement of the energy storage battery pack and the power utilization requirement of a load after passing through an AC/DC bidirectional inverter. The AC/DC bidirectional inverter is used for carrying out voltage stabilization, voltage regulation and constant current treatment on the temperature difference power generation voltage, so that the temperature difference power generation voltage is output as stable voltage to be supplied to an energy storage end to charge an energy storage battery pack; and if the load needs electricity at the same time, the electricity suitable for the load needs is converted and output through the AC/DC bidirectional inverter at the same time.
The AC/DC bidirectional inverter device converts electric energy output by the ocean temperature difference energy generator into high-voltage constant-current DC electric energy, the energy storage battery pack is charged through the charging and discharging module, and when the electric quantity of the battery pack reaches a set upper limit, the charging is stopped; when the AC/DC bidirectional inverter is used for charging the energy storage battery pack, if a load needs to provide electric energy, the AC/DC bidirectional inverter simultaneously converts the electric energy in another circuit through the DC/AC inverter and outputs the electric energy suitable for the use requirement of the load, and the electric energy is supplied to the load for use.
As shown in fig. 4, OTEC for distributed generation is as follows:
the AC/DC bi-directional inverter device converts DC power output from the DC or energy storage battery pack into load-compatible AC power.
The output ends of the AC/DC bidirectional inverter and the DC/AC inverter are connected with a power supply circuit of an electric appliance after being connected with devices such as a switch, a safety fuse and the like according to a wiring rule;
an intelligent system for charge and discharge management is connected between the AC/DC bidirectional inverter device and the energy storage battery pack; and carrying out charge and discharge management and protection on the energy storage battery.
The output voltage of the AC/DC bidirectional inverter is designed according to a combination scheme and a capacity value of an energy storage battery pack, the output voltage is greater than the voltage of the energy storage battery pack, for example, the energy storage battery pack is composed of 160 3.2V lithium iron phosphate batteries with the capacity of 100Ah in a series connection mode, the voltage of the energy storage battery pack is 512V, the charging voltage of the energy storage battery pack is about to be over 512V, and a floating charging voltage value is added.
The DC/AC inverter is an AC/DC bidirectional inverter device which converts DC electricity or DC electricity output by an energy storage battery pack into AC electricity suitable for loads, and the AC voltage after conversion is converted into high voltage electricity through a transformer and then the high voltage electricity is transmitted to a high voltage power grid to transmit electric energy. The DC/AC inversion conversion is carried out according to the requirements of the transmission voltage and current of the power grid, so as to ensure the safe and stable power transmission of the power grid, and the power grid is ensured not to be impacted according to the requirement of the load end on the adaptive voltage of 220V/380V or other voltages.
The output ends of the AC/DC bidirectional inverter and the DC/AC inverter are connected with the switch and the safety device and then are connected with an electric appliance power supply circuit; and a charging and discharging management intelligent system is connected between the AC/DC bidirectional inverter and the energy storage battery pack to perform charging, discharging management and protection on the energy storage battery pack.
The intelligent charging and discharging management system adjusts proper voltage and proper constant current to charge the energy storage battery pack according to the combination mode of the energy storage batteries, collects the voltage, capacity, charging current, temperature and other data of each unit battery in the process, adjusts the charging voltage and current of each unit battery in the circuit according to the equalizing charging rule, and stops continuously charging when the voltage of each unit battery reaches the upper limit of the charging voltage.
When the energy storage battery pack discharges, data such as voltage, capacity, charging current, temperature and the like of each unit battery are collected, the data are controlled by a discharge management system, and when the voltage of each unit battery drops to the lower limit of the voltage in the discharging process, discharging is stopped.
When the energy storage battery pack is in the charging and discharging processes, the system detects that the current reaches a limit value, and the charging and discharging are stopped; when the system detects the short circuit in the charging and discharging processes of the energy storage battery pack, the circuit is disconnected; when the system detects that the temperature of a certain monitoring point exceeds a limit value, the disconnection circuit stops the work of the related power-related device.
As shown in fig. 5, the energy storage battery pack is connected to a power grid to deliver electric energy, and is used for grid connection after passing through a DC/AC inverter and phase-locked frequency conversion, so as to convert a DC power supply into AC power required for grid connection.
The energy storage battery pack is connected to the grid to transmit electric energy, and is connected to the electric energy meter to be measured so as to count electric quantity.
When the electric quantity of the energy storage battery pack reaches a set grid-connected power transmission upper limit value, starting a DC/AC inverter device to transmit electric energy to a parallel power grid; when the electric energy is transmitted to the grid-connected power grid, if the power supply quantity of the power generation end is smaller than the electric quantity output by the energy storage battery pack to the parallel power grid, the electric quantity stored by the energy storage battery pack is continuously reduced, and when the electric quantity is reduced to the electric quantity lower limit set by the energy storage battery pack, the DC/AC inverter is disconnected, and the electric energy output to the grid-connected power grid is stopped.
Besides ocean temperature difference energy, the invention also has available temperature difference power generation technology. Such as nuclear power plants, are hot, can generate electricity by temperature difference with the temperature of seawater and are sustainable.
The energy storage battery of the invention is a lithium iron phosphate (LFP battery, a ternary lithium battery (NCM/NCA) battery, a Lithium Cobaltate (LCO) battery, other lithium batteries such as a lithium manganate battery, a lithium titanate battery and the like.
The energy storage management system can use a chip processor integrated with the management system to display through a touch screen.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All modifications made according to the spirit of the main technical scheme of the invention are covered in the protection scope of the invention.

Claims (5)

1. The utility model provides a complementary marine energy integration power generation system of multipotency which characterized in that, includes wind power generation system, photovoltaic power generation system, ocean temperature difference energy power generation system to be equipped with energy storage system, sea water desalination system, wherein:
the wind power generation system adopts four universal wind power generators which are respectively arranged around the offshore power generation platform, and the universal wind power generators adopt arc-shaped blades;
the photovoltaic power generation system adopts a third-generation perovskite solar panel, and the solar panel is arranged on the top of a marine power generation platform and the top of a wind driven generator;
the ocean temperature difference energy power generation system adopts a closed circulation system and takes ammonia as a working medium; liquid ammonia is stored in an ammonia storage tank and pumped into a pipeline through a working medium pump, the pipeline heats liquid ammonia for the first time through a flash evaporator filled with warm seawater to gasify the liquid ammonia, then a return pipeline passes through a solar energy concentrating disc, solar energy heats the return pipeline for the second time, the temperature of ammonia steam entering a turbine reaches the highest temperature, the pressure of ammonia reaches the maximum, high-pressure ammonia drives blades of the turbine to rotate, and an impeller shaft of the turbine is connected with a generator to generate electricity; the ammonia vapor enters a condenser after exiting the turbine;
the seawater desalination system is arranged in the condenser, cold seawater is pumped into the cold water pool through a cold water pump, steam flowing through the turbine is cooled and liquefied through the cold water pool through a pipeline, the cold water absorbs heat, is evaporated and evaporated, and a condensing plate is arranged at the top of the cold water pool and is used for condensing evaporated fresh water and liquefying ammonia vapor into liquid ammonia;
the energy storage system comprises two parts, wherein the first part is an energy storage box consisting of an energy storage battery pack and used for storing redundant electric quantity of the system; the second part is a warm seawater energy storage tank, and surface seawater is pumped into hot water of the flash evaporator to heat working media in the daytime and then is stored in the warm seawater energy storage tank for use at night;
the output voltage of the ocean temperature difference energy power generation system is subjected to voltage stabilization, voltage regulation and constant current treatment through an AC/DC bidirectional inverter, is output as stable voltage and is supplied to an energy storage battery pack for charging and load power utilization;
the AC/DC bidirectional inverter device converts electric energy output by the ocean temperature difference energy generator into high-voltage constant-current DC electric energy, the energy storage battery pack is charged through the charging and discharging module, and when the electric quantity of the battery pack reaches a set upper limit, the charging is stopped; when the AC/DC bidirectional inverter device charges the energy storage battery pack, if a load needs to provide electric energy, the AC/DC bidirectional inverter device simultaneously converts another circuit through the DC/AC inverter and outputs electricity suitable for the use requirement of the load so as to supply the electricity for the load;
the output voltage of the AC/DC bidirectional inverter is designed according to the combination scheme and the capacity value of the energy storage battery pack, the output voltage is greater than the voltage of the energy storage battery pack, and a float charging voltage value is added;
the output ends of the AC/DC bidirectional inverter and the DC/AC inverter are connected with the switch and the safety device and then are connected with an electric appliance power supply circuit; the AC/DC bidirectional inverter and the energy storage battery pack are connected with a charging and discharging management intelligent system to perform charging and discharging management and protection on the energy storage battery pack;
the intelligent charging and discharging management system adjusts proper voltage and proper constant current to charge the energy storage battery pack according to the combination mode of the energy storage batteries by the electricity output by the AC/DC bidirectional inverter, collects the voltage, capacity, charging current and temperature data of each unit battery in the process, adjusts the charging voltage and current of each unit battery in the circuit according to the equalizing charging rule, and stops continuously charging when the voltage of each unit battery reaches the upper limit of the charging voltage.
2. The multi-energy complementary offshore energy integrated power generation system according to claim 1, wherein when the energy storage battery pack discharges, voltage, capacity, charge-discharge current and temperature data of each unit cell are also collected and controlled by the discharge management system, and when the voltage of the unit cell drops to the lower limit of the voltage in the discharging process, the discharging is stopped.
3. The multi-energy complementary offshore energy integrated generation system according to claim 2, wherein when the energy storage battery pack is in the charging and discharging process, the system detects that the current reaches a limit value, the charging and discharging are stopped; when the system detects the short circuit in the charging and discharging processes of the energy storage battery pack, the circuit is disconnected; when the system detects that the temperature of a certain monitoring point exceeds a limit value, the disconnection circuit stops the work of the related power-related device.
4. The multi-energy complementary offshore energy integrated power generation system according to claim 3, wherein the energy storage battery pack is connected to a power grid to deliver electric energy, and the DC power supply is converted into AC power required for grid connection after passing through a DC/AC inverter and phase-locked frequency conversion.
5. The multi-energy complementary offshore energy integrated generation system of claim 4, wherein the energy storage battery pack is connected to a grid to deliver electric energy and is connected to an electric energy meter to meter so as to count electric quantity.
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CN111210080B (en) * 2020-01-09 2023-07-11 华翔翔能科技股份有限公司 Hybrid ocean energy multi-energy complementary energy hub and joint regulation and control method
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