CN113381443A - Working method of new energy power generation power grid load fluctuation compensation system - Google Patents

Working method of new energy power generation power grid load fluctuation compensation system Download PDF

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Publication number
CN113381443A
CN113381443A CN202110567016.0A CN202110567016A CN113381443A CN 113381443 A CN113381443 A CN 113381443A CN 202110567016 A CN202110567016 A CN 202110567016A CN 113381443 A CN113381443 A CN 113381443A
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energy
generator set
power
storage unit
heat
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CN113381443B (en
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郭东奇
刘冲
马晓峰
刘欢
杜珺
闫蕾
杨永明
韩飞
狄艺珍
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Shanxi Yidi Guanghua Electric Power Survey And Design Co ltd
China Energy Engineering Group Shanxi Electric Power Engineering Co Ltd
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Shanxi Yidi Guanghua Electric Power Survey And Design Co ltd
China Energy Engineering Group Shanxi Electric Power Engineering Co Ltd
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    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y02E10/76—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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances
    • Y04S20/244—Home appliances the home appliances being or involving heating ventilating and air conditioning [HVAC] units

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a working method of a load fluctuation compensation system of a new energy power generation power grid, and solves the problem of how to realize transcritical CO2The heat pump unit, the ORC low-temperature generator set and the new energy power generation grid which are used as working media are combined to achieve the problem that new energy electric energy such as photovoltaic and wind power with large power generation load fluctuation is transited to a stable power grid. When the electricity generated by the new energy generator set is in wave crest surplus, the transcritical CO is generated2The heat pump unit is connected with the new energy generator set, and wave crest surplus electric energy generated by the new energy generator set is converted into heat energy of the heat energy storage unit and cold energy of the cold energy storage unit; when the electricity generated by the new energy generator set is in a wave valley, the Organic Rankine Cycle (ORC) low-temperature generator set is connected into the thermal energy storage unit and the cold energy storage unit, and the organic Rankine cycle is performedAnd (ORC) feeding the electricity generated by the low-temperature generator set back to the power grid to realize peak clipping and valley filling of the power grid.

Description

Working method of new energy power generation power grid load fluctuation compensation system
Technical Field
The invention relates to a new energy power generation grid, in particular to a method for generating power by using transcritical carbon dioxide (CO)2) The heat pump unit is a compensation system which stores new energy electric energy such as photovoltaic energy, wind power energy and the like into heat energy and cold energy, and then stably outputs the stored heat energy and cold energy to a power grid by utilizing an Organic Rankine Cycle (ORC) low-temperature generator set.
Background
For new energy such as photovoltaic energy, wind power and the like, due to the fluctuation of the self power generation load, electric energy cannot be stably provided for a power grid, the power generation time period of the new energy such as photovoltaic energy, wind power and the like is not matched with the power utilization load fluctuation period of the power grid, and a certain problem exists in grid-connected power transmission of a new energy power station; with the continuous improvement of installed capacity of new energy such as photovoltaic energy, wind power and the like, in order to ensure the stability of a power grid, photovoltaic power stations and wind power stations need to be equipped with energy storage systems to play the roles of peak clipping and valley filling so as to enable the power grid to operate stably; at present, centralized heating of urban residents and combined cooling heating and power generation systems of industrial parks are mainly born by thermal power units, the occupation ratio of the thermal power units is gradually reduced along with the increasing occupation ratio of new energy power stations such as photovoltaic power stations, wind power stations and the like, and the trend that the thermal power units are replaced by new energy is realized. Transcritical CO2The heat pump is a heat pump utilizing transcritical CO2As working medium, heat pump units usingTranscritical CO2As a circulating working medium, cold energy and heat energy can be produced by using electric energy; the ORC low-temperature generator set is a generator set which utilizes an organic working medium as a circulating working medium and can generate electricity by utilizing heat energy and cold energy at lower temperature; how to cross critical CO2The combination of a heat pump unit, an ORC low-temperature generator unit and a new energy power generation grid serving as working media is used for realizing the transition of new energy electric energy such as photovoltaic and wind power with large power generation load fluctuation to a stable grid, the load fluctuation of the grid can be quickly responded, and meanwhile, the stored heat energy and cold energy can be used for combined supply of heat and cold for urban residents and industrial parks, so that the combination becomes an important subject for the research of technicians in the field at present.
Disclosure of Invention
The invention provides a working method of a load fluctuation compensation system of a new energy power generation power grid, and solves the problem of how to realize transcritical CO2The heat pump unit, the ORC low-temperature generator set and the new energy power generation grid which are used as working media are combined to achieve the technical problem of transition of new energy electric energy such as photovoltaic and wind power with large power generation load fluctuation to a stable power grid.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: for the electricity generated by the new energy generator set, when the wave crest is excessive, the transcritical CO is generated2The heat pump unit is connected with the new energy generator set, and wave crest surplus electric energy generated by the new energy generator set is converted into heat energy of the heat energy storage unit and cold energy of the cold energy storage unit; and for the electricity generated by the new energy generator set, when the electricity is in a valley, the Organic Rankine Cycle (ORC) low-temperature generator set is connected into the heat energy storage unit and the cold energy storage unit, and the electricity generated by the Organic Rankine Cycle (ORC) low-temperature generator set is fed back to the power grid so as to realize peak clipping and valley filling of the power grid.
A new energy power generation power grid load fluctuation compensation system comprises a wind power or photovoltaic new energy generator set and a transcritical CO2The heat pump unit and the ORC low-temperature generator set, the wind power or photovoltaic new energy generator set are connected with a power grid through a power transmission line, and the wind power or photovoltaic new energy generator setThe energy generating set passes through the power supply line of the heat pump unit and transcritical CO2The power supply ends of the heat pump units are connected together and cross critical CO2The high temperature end of the heat pump unit is connected with the heat energy storage unit through a heat energy transmission pipeline to transcritically transfer CO2The low temperature end of the heat pump unit is connected with the cold energy storage unit through a cold energy conveying pipeline; the ORC low-temperature generator set is connected with the heat energy storage unit through a second heat energy conveying pipeline, the ORC low-temperature generator set is connected with the cold energy storage unit through a second cold energy conveying pipeline, and the power generation output end of the ORC low-temperature generator set is connected with a power grid through a power transmission loopback line.
The heat energy storage unit is connected with a heat user through an external heat supply pipeline; the cold energy storage unit is connected with a cold user through an external cold supply pipeline; the power generation output end of the ORC low-temperature generator set is connected with the trans-critical CO through a second power supply line of the heat pump unit2The power supply ends of the heat pump units are connected together.
A working method of a new energy power generation power grid load fluctuation compensation system comprises a wind power or photovoltaic new energy generator set and a transcritical CO2The heat pump unit and the ORC low-temperature generator set, the wind power or photovoltaic new energy generator set are connected with a power grid through a power transmission line, and the wind power or photovoltaic new energy generator set is connected with the trans-critical CO through a power supply line of the heat pump unit2The power supply ends of the heat pump units are connected together and cross critical CO2The high temperature end of the heat pump unit is connected with the heat energy storage unit through a heat energy transmission pipeline to transcritically transfer CO2The low temperature end of the heat pump unit is connected with the cold energy storage unit through a cold energy conveying pipeline; the ORC low-temperature generator set is connected with the heat energy storage unit through a second heat energy conveying pipeline, the ORC low-temperature generator set is connected with the cold energy storage unit through a second cold energy conveying pipeline, and the power generation output end of the ORC low-temperature generator set is connected with a power grid through a power transmission loopback line; the method is characterized by comprising the following steps:
when the electricity generated by the wind power or photovoltaic new energy generator set is at a peak, the trans-critical CO is generated2The heat pump unit is connected into the wind power or photovoltaic new energy generator set, so that the surplus electric energy generated by the wind power or photovoltaic new energy generator set passes through the transcritical CO2The heat pump unit is used for respectively converting heat energy into heat energy and storing the heat energy in the heat energy storage unit and cold energy in the cold energy storage unit;
and secondly, when the electricity generated by the wind power or photovoltaic new energy generator set is in a wave trough, the ORC low-temperature generator set is started, the heat energy in the heat energy storage unit and the cold energy in the cold energy storage unit are converted into the electric energy output by the ORC low-temperature generator set, and the electric energy is fed back to the power grid.
According to the invention, the load fluctuation compensation technology of first energy storage and then power generation is adopted to realize stable power supply of new energy resources such as photovoltaic energy, wind power and the like with large power generation load fluctuation, and meanwhile, cold and heat combined supply can be carried out on urban residents and industrial parks.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a new energy power generation power grid load fluctuation compensation system comprises a wind power or photovoltaic new energy generator set 1 and a transcritical CO2The heat pump unit 5 and the ORC low-temperature generator set 11, the wind power or photovoltaic new energy generator set 1 are connected with the power grid 3 through the power transmission line 2, and the wind power or photovoltaic new energy generator set 1 is connected with the trans-critical CO through the heat pump unit power supply line 42The power supply ends of the heat pump units 5 are connected together and cross critical CO2The high temperature end of the heat pump unit 5 is connected with a heat energy storage unit 7 through a heat energy transmission pipeline 6, and the transcritical CO is generated2The low temperature end of the heat pump unit 5 is connected with a cold energy storage unit 9 through a cold energy conveying pipeline 8; the ORC low-temperature generator set 11 is connected with the thermal energy storage unit 7 through a second thermal energy conveying pipeline 10, the ORC low-temperature generator set 11 is connected with the cold energy storage unit 9 through a second cold energy conveying pipeline 12, and the power generation output end of the ORC low-temperature generator set 11 is connected with the power grid 3 through a power transmission loopback line 13.
Heat energy storage sheetThe unit 7 is connected to a heat consumer 15 by means of an external heat supply pipeline 14; the cold energy storage unit 9 is connected with a cold user 17 through an external cold supply pipeline 16; the power generation output end of the ORC low-temperature generator set 11 passes through a second power supply line 18 of the heat pump set and the transcritical CO2The power supply terminals of the heat pump units 5 are connected together.
A working method of a new energy power generation power grid load fluctuation compensation system comprises a wind power or photovoltaic new energy generator set 1 and a transcritical CO2The heat pump unit 5 and the ORC low-temperature generator set 11, the wind power or photovoltaic new energy generator set 1 are connected with the power grid 3 through the power transmission line 2, and the wind power or photovoltaic new energy generator set 1 is connected with the trans-critical CO through the heat pump unit power supply line 42The power supply ends of the heat pump units 5 are connected together and cross critical CO2The high temperature end of the heat pump unit 5 is connected with a heat energy storage unit 7 through a heat energy transmission pipeline 6, and the transcritical CO is generated2The low temperature end of the heat pump unit 5 is connected with a cold energy storage unit 9 through a cold energy conveying pipeline 8; the ORC low-temperature generator set 11 is connected with the thermal energy storage unit 7 through a second thermal energy conveying pipeline 10, the ORC low-temperature generator set 11 is connected with the cold energy storage unit 9 through a second cold energy conveying pipeline 12, and the power generation output end of the ORC low-temperature generator set 11 is connected with the power grid 3 through a power transmission loopback line 13; the method is characterized by comprising the following steps:
when the electricity generated by the wind power or photovoltaic new energy generator set 1 is at a wave crest, the trans-critical CO is generated2The heat pump unit 5 is connected into the wind power or photovoltaic new energy generator set 1, so that the surplus electric energy generated by the wind power or photovoltaic new energy generator set 1 passes through the transcritical CO2The heat pump unit 5 is used for respectively converting heat energy into heat energy and storing the heat energy in the heat energy storage unit 7 and cold energy in the cold energy storage unit 9;
and secondly, when the electricity generated by the wind power or photovoltaic new energy generator set 1 is in a wave trough, the ORC low-temperature generator set 11 is started, the heat energy in the heat energy storage unit 7 and the cold energy in the cold energy storage unit 9 are converted into electric energy output by the ORC low-temperature generator set 11, and the electric energy is fed back to the power grid 3.
When new energy such as wind power or photovoltaic power generation is negativeWhen the load is matched with the power load of the power grid, the electric energy generated by the wind power or photovoltaic new energy generator set 1 is transmitted to the power grid 3 through the power transmission line 2, and the power grid 3 drives the load to normally operate; when the power load of the wind power or photovoltaic new energy generator set 1 is not matched with the power load of the power grid 3, namely the generated electric energy is larger than the power load, the electric energy generated by the wind power or photovoltaic new energy generator set 1 drives the transcritical CO through the power transmission line 42The heat pump unit 5 starts to operate and transcritical CO2The heat energy generated by the high temperature end of the heat pump unit 5 is stored in the heat energy storage unit 7 through the heat energy transmission pipeline 6, and meanwhile, the transcritical CO is generated2Cold energy generated by the low-temperature end of the heat pump unit 5 is stored in the cold energy storage unit 9 through the cold energy conveying pipeline 8, so that the function of respectively converting redundant new energy electric energy into heat energy and cold energy for storage is realized; when the power load of the wind power or photovoltaic new energy generator set 1 is not matched with the power load of the power grid 3, namely the generated electric energy is smaller than the power load, the heat energy stored by the heat energy storage unit 7 is heated by the second heat energy conveying pipeline 10 to drive the organic working medium of the ORC low-temperature generator set 11 to generate electricity, the cold energy stored by the cold energy storage unit 9 is connected with the ORC low-temperature generator set 11 by the second cold energy conveying pipeline 12 to cool the organic working medium exhaust steam of the ORC low-temperature generator set, the generated electric energy is sent to the power grid 3 by the ORC low-temperature generator set 11 through the power transmission loopback line 13, the stable output of the power generation load of the new energy generator sets such as photovoltaic and wind power is realized, and meanwhile, the change of the power grid load can be quickly responded.
The ORC low-temperature generator set 11 passes through a second power supply line 18 of the heat pump set and transcritical CO2The heat pump unit 5 is connected and drives the operation of related electric equipment by using the generated stable electric energy; the thermal energy storage unit 7 centrally supplies a part of the stored thermal energy to the heat consumer 15 through the external heat supply pipeline 14; the cold energy storage unit 9 supplies cold energy stored in the cold energy storage unit to a cold user 17 through an external cold supply pipeline 16 in a centralized manner; therefore, the external cooling and heating combined supply function of the power generation load compensation system is realized, and the system can replace part of coal-fired units to perform clean heating and cooling. The invention has the beneficial effect that the carbon dioxide (CO) is transcritical2) Heat pumpThe generator set, the cold and hot energy storage unit and the ORC low-temperature generator set are combined, the photovoltaic power generation load, the wind power generation load and other power generation loads with large fluctuation are compensated, and stable output of new energy electric energy is achieved. And simultaneously, the combined supply of cold and heat can be carried out on urban residents and industrial parks.

Claims (1)

1. A working method of a new energy power generation power grid load fluctuation compensation system comprises a wind power or photovoltaic new energy generator set (1) and a transcritical CO2The heat pump unit (5) and the ORC low-temperature generator set (11) are connected with the power grid (3) through the power transmission line (2), and the wind power or photovoltaic new energy generator set (1) is connected with the trans-critical CO through the heat pump unit power supply line (4)2The power supply ends of the heat pump units (5) are connected together and cross critical CO2The high temperature end of the heat pump unit (5) is connected with the heat energy storage unit (7) through a heat energy transmission pipeline (6) to cross critical CO2The low temperature end of the heat pump unit (5) is connected with the cold energy storage unit (9) through a cold energy conveying pipeline (8); the ORC low-temperature generator set (11) is connected with the thermal energy storage unit (7) through a second thermal energy conveying pipeline (10), the ORC low-temperature generator set (11) is connected with the cold energy storage unit (9) through a second cold energy conveying pipeline (12), and the power generation output end of the ORC low-temperature generator set (11) is connected with the power grid (3) through a power transmission return line (13); the method is characterized by comprising the following steps:
when the electricity generated by the wind power or photovoltaic new energy generator set (1) is at a wave peak, the trans-critical CO is generated2The heat pump unit (5) is connected into the wind power or photovoltaic new energy generator set (1), so that the electric energy generated by the surplus wind power or photovoltaic new energy generator set (1) passes through the transcritical CO2The heat pump unit (5) is used for respectively converting heat energy into heat energy and storing the heat energy in the heat energy storage unit (7) and cold energy in the cold energy storage unit (9);
and secondly, when the electricity generated by the wind power or photovoltaic new energy generator set (1) is in a wave valley, the ORC low-temperature generator set (11) is started, the heat energy in the heat energy storage unit (7) and the cold energy in the cold energy storage unit (9) are converted into the electric energy output by the ORC low-temperature generator set (11), and the electric energy is fed back to the power grid (3).
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Citations (19)

* Cited by examiner, † Cited by third party
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