CN106685315A - Photovoltaic photo-thermal complementary power generation system and power generation method thereof - Google Patents

Photovoltaic photo-thermal complementary power generation system and power generation method thereof Download PDF

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Publication number
CN106685315A
CN106685315A CN201611193739.4A CN201611193739A CN106685315A CN 106685315 A CN106685315 A CN 106685315A CN 201611193739 A CN201611193739 A CN 201611193739A CN 106685315 A CN106685315 A CN 106685315A
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grid
heat
photovoltaic
power generation
photovoltaic cell
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Inventor
李健
花磊
徐晓敏
蹇钊
单文涛
王涛
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CGN SOLAR ENERGY DEVELOPMENT Co Ltd
China General Nuclear Power Corp
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CGN SOLAR ENERGY DEVELOPMENT Co Ltd
China General Nuclear Power Corp
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Priority to CN201611193739.4A priority Critical patent/CN106685315A/en
Publication of CN106685315A publication Critical patent/CN106685315A/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/10PV 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
    • H02J3/383
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S20/00Supporting structures for PV modules
    • H02S20/30Supporting structures being movable or adjustable, e.g. for angle adjustment
    • H02S20/32Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/40Thermal components
    • H02S40/44Means to utilise heat energy, e.g. hybrid systems producing warm water and electricity at the same time
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/60Thermal-PV hybrids

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  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a photovoltaic photo-thermal complementary power generation system and a power generation method thereof. The photovoltaic photo-thermal complementary power generation system comprises a condensation field (1), a sunlight tracking control unit, a support tower (2), a photovoltaic cell assembly (3), a grid-connected device, a heat absorber (4), a heat storage system (5), a thermal power generation system (6), a power grid state detector and a master controller. According to the invention, a high-power condensation photovoltaic power generation technology is combined with a solar thermal power generation technology in a complementary way; the system and method have the advantages that when the power grid allows grid-connected power delivery and it is not in a power utilization peak, a condensation photovoltaic system is used for power generation; when the power grid is limited and is incapable of grid connected power delivery, the heat absorbing and storing devices are used to store energy in the form of heat energy; and when the power grid allows s grid-connected power delivery and it is in the power utilization peak, both the condensation photovoltaic system and the stored heat energy are used for power generation, and using requirements of people are met. Thus, the utilization efficiency of solar energy is improved effectively, and the generating capacity is increased.

Description

Photovoltaic and photothermal complementary power generation system and electricity-generating method
Technical field
The invention belongs to technical field of solar utilization technique, and in particular to a kind of photovoltaic and photothermal complementary power generation system and generating Method.
Background technology
Photovoltaic generating system (PV System) is the electricity generation system for converting solar energy into electric energy, and what is utilized is photoproduction volt Specially good effect is answered, and its critical piece is solaode.Photovoltaic generating system has reliability height, long service life, free from environmental pollution The advantages of, with vast potential for future development.
However, existing photovoltaic generating system, is primarily present following deficiency:Because electrical network digestion capability is limited, cause to abandon Wind is abandoned electrical phenomena and is become increasingly conspicuous, and causes the electricity that photovoltaic generating system sends to be sent to the situation of electrical network, so as to reduce photovoltaic The utilization ratio of electricity generation system, also reduces solar energy utilization ratio.
The content of the invention
For the defect that prior art is present, the present invention provides a kind of photovoltaic and photothermal complementary power generation system and generating side Method, can effectively solving the problems referred to above.
The technical solution used in the present invention is as follows:
The present invention provides a kind of photovoltaic and photothermal complementary power generation system, including:Optically focused field (1), sun light tracking control unit, Support tower (2), photovoltaic cell component (3), grid-connecting apparatus, heat extractor (4), heat reservoir (5), heat generating system (6), electrical network shape State detection means and master controller;
The optically focused field (1) is disposed with multiple photovoltaic arrays, and each described photovoltaic array is controlled with the sun light tracking Unit connects, and by the sun light tracking control unit, according to the focal position of current setting, controls the photovoltaic array Attitude, realizes the maximization of the solar energy of the focal position of current setting;
The top of the support tower (2) fixedly mounts successively the photovoltaic cell component (3) and institute by order from top to bottom State heat extractor (4);The outfan of the photovoltaic cell component (3) is connected with the grid-connecting apparatus, real by the grid-connecting apparatus Now the electric energy that the photovoltaic cell component (3) sends is connected to the grid;The outfan and the heat reservoir of the heat extractor (4) (5) one end connection, the other end of the heat reservoir (5) is connected with one end of the heat generating system (6), and the heat generates electricity The other end of system (6) is connected to the grid-connecting apparatus, by the grid-connecting apparatus, realizes sending out the heat generating system (6) The electric energy for going out is connected to the grid;
The master controller respectively with the sun light tracking control unit, the heat generating system (6) and the electricity Net state detection means connects.
Preferably, the photovoltaic cell component (3) is high power condensation photovoltaic battery component.
Preferably, the high power condensation photovoltaic battery component is III-V multijunction solar cells.
Preferably, the heat extractor (4) is cavity type heat absorber or the external heat extractor of column type.
Preferably, the heat-transfer fluid of the heat extractor (4) is device of working medium, conduction oil or fused salt.
The present invention also provides a kind of electricity-generating method using above-mentioned photovoltaic and photothermal complementary power generation system, including following step Suddenly:
Step 1, master controller storage heat extractor position coordinateses and photovoltaic cell component position coordinateses;Master controller according to Heat extractor position coordinateses, generate the 1st control strategy;Master controller generates the 2nd and controls plan according to photovoltaic cell component position coordinateses Slightly;Wherein, the 1st control strategy is used for:Sun light tracking control unit is controlled, and then makes heat extractor be located at optically focused The focal position of the photovoltaic array of field;2nd control strategy is used for:Sun light tracking control unit is controlled, and then Photovoltaic cell component is set to be located at the focal position of the photovoltaic array of optically focused field;
Step 2, master controller obtains in real time electric network state by power grid state detecting device;Wherein, the electric network state Including three kinds, respectively:Electrical network allows grid-connected power transmission and network load limits grid-connected power transmission, electrical network less than given threshold N, electrical network Allow grid-connected power transmission and network load is higher than given threshold N;
If current electric grid state is electrical network allows grid-connected power transmission and network load is less than given threshold N, perform following Step:
Master controller is controlled based on the 2nd control strategy to sun light tracking control unit, and then makes photovoltaic cell group Part is located at the focal position of the photovoltaic array of optically focused field;Optically focused place aggregation sunlight on photovoltaic cell component, light The electric energy that photovoltaic cell components send is delivered directly in electrical network by grid-connecting apparatus;
If current electric grid state is electrical network limits grid-connected power transmission, following steps are performed:
Master controller is controlled based on the 1st control strategy to sun light tracking control unit, and then is located at heat extractor The focal position of the photovoltaic array of optically focused field;The sunlight of optically focused place aggregation is heated in heat extractor on heat extractor Heat-conducting fluid, high-temperature heat-conductive fluid storage to heat reservoir (5), realizes the storage of heat energy;
If current electric grid state is electrical network allows grid-connected power transmission and network load is higher than given threshold N, perform following Step:
Master controller performs procedure below:Master controller is carried out based on the 2nd control strategy to sun light tracking control unit Control, and then make photovoltaic cell component be located at the focal position of the photovoltaic array of optically focused field;The solar irradiation of optically focused place aggregation Penetrate on photovoltaic cell component, the electric energy that photovoltaic cell component sends is delivered directly in electrical network by grid-connecting apparatus;Meanwhile, always Controller starts heat generating system (6), and the converting heat that heat generating system (6) stores heat reservoir (5) is electric energy, then is passed through Grid-connecting apparatus are delivered directly in electrical network;It is achieved in the cogeneration of photovoltaic cell and heat energy.
A kind of photovoltaic and photothermal complementary power generation system and electricity-generating method that the present invention is provided has advantages below:
Photovoltaic and photothermal complementary power generation system and electricity-generating method that the present invention is provided, high power concentrating photovoltaic is generated electricity and the sun The hot generation technology complementation of energy combines, with advantages below:
When it is not peak of power consumption that electrical network allows grid-connected power transmission, generated electricity using concentration photovoltaic system;When electrical network is limited System cannot grid-connected power transmission when, using heat absorption and heat-storing device, energy is stored in the form of heat energy;When electrical network allow it is grid-connected Power transmission and for peak of power consumption when, while using concentration photovoltaic system generate electricity and stored heat energy power-generating, so as to meet people Use demand.Therefore, the present invention effectively increases the utilization ratio of solar energy, increases generated energy.
Description of the drawings
The structural representation of the photovoltaic and photothermal complementary power generation system that Fig. 1 is provided for the present invention.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, below in conjunction with Drawings and Examples, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein only to The present invention is explained, is not intended to limit the present invention.
High power concentrating photovoltaic electricity generation system and solar thermal power generation system are all to utilize dual-axis tracking system, and sunlight is carried out High power concentrator, increases the energy-flux density at focusing, improve generating efficiency.Wherein, high power light concentrating photovoltaic system is more by iii-v Connection solar cell is placed on the focal position of condenser system, and the generating efficiency of battery is improved under high solar radiation;And solar energy It is then to place heat sink in optically focused focal point that heat generates electricity, and using heat-transfer fluid solar radiation is absorbed, and produces high temperature and high pressure steam, It is then converted to electric energy.High power condensation photovoltaic battery has higher generating efficiency, but without energy-storage system, abandons wind is abandoned at present Under the severe situation of electricity, the electricity that sending often occurs in Jing cannot be transported to the problem of electrical network, cause sun light utilization efficiency low.And the sun Hot can generate electricity and have and the advantage for generating electricity can be postponed with heat accumulation.The present invention combines two kinds of generation modes, allows simultaneously in electrical network When net transmission of electricity and relatively low network load, generated electricity using high power concentrating photovoltaic;And electrical network is when there is abandoning electric problem, using heat reservoir Storage of solar energy is got up;When electrical network allows grid-connected transmission of electricity and higher network load, on the one hand, using high power concentrating photovoltaic electricity Pond generates electricity;On the other hand, the heat energy power-generating for being stored using heat reservoir;Due to adopting times Condensation photovoltaic battery to send out electrically and thermally simultaneously Can generate electricity, electrical network high load capacity demand can be met.
With reference to Fig. 1, the present invention provides a kind of photovoltaic and photothermal complementary power generation system, including:Optically focused field 1, sun light tracking control Unit processed, support tower 2, photovoltaic cell component 3, grid-connecting apparatus, heat extractor 4, heat reservoir 5, heat generating system 6, electric network state Detection means and master controller;
Optically focused field 1 is disposed with multiple photovoltaic arrays, and each photovoltaic array is connected with sun light tracking control unit, by too Sunshine tracking control unit, according to the focal position of current setting, controls the attitude of photovoltaic array, realizes the focus of current setting The maximization of the solar energy of position;
The top of support tower 2 fixedly mounts successively photovoltaic cell component 3 and heat extractor 4 by order from top to bottom;Photovoltaic electric The outfan of pond component 3 is connected with grid-connecting apparatus, and by grid-connecting apparatus, realization is incorporated to the electric energy that photovoltaic cell component 3 sends Electrical network;The outfan of heat extractor 4 is connected with one end of heat reservoir 5, the other end of heat reservoir 5 and the one of heat generating system 6 End connection, the other end of heat generating system 6 is connected to grid-connecting apparatus, by grid-connecting apparatus, what realization sent heat generating system 6 Electric energy is connected to the grid;
Master controller is connected respectively with sun light tracking control unit, heat generating system 6 and power grid state detecting device.
In practical application, photovoltaic cell component 3 adopts high power condensation photovoltaic battery component, for example, sun electricity is tied III-V more Pond.Heat extractor 4 includes but is not limited to device of working medium, heat conduction using cavity type heat absorber or the external heat extractor of column type, its heat-transfer fluid Oil or fused salt.The heat-storage medium of heat reservoir can be consistent with heat-conducting fluid, or the higher medium of thermal capacitance.
The present invention also provides a kind of electricity-generating method using above-mentioned photovoltaic and photothermal complementary power generation system, including following step Suddenly:
Step 1, master controller storage heat extractor position coordinateses and photovoltaic cell component position coordinateses;Master controller according to Heat extractor position coordinateses, generate the 1st control strategy;Master controller generates the 2nd and controls plan according to photovoltaic cell component position coordinateses Slightly;Wherein, the 1st control strategy is used for:Sun light tracking control unit is controlled, and then makes heat extractor be located at optically focused field The focal position of photovoltaic array;2nd control strategy is used for:Sun light tracking control unit is controlled, and then makes photovoltaic electric Pond component is located at the focal position of the photovoltaic array of optically focused field;
Step 2, master controller obtains in real time electric network state by power grid state detecting device;Wherein, electric network state includes Three kinds, respectively:Electrical network allows grid-connected power transmission and network load limits grid-connected power transmission, electrical network and allow less than given threshold N, electrical network Grid-connected power transmission and network load are higher than given threshold N;
If current electric grid state is electrical network allows grid-connected power transmission and network load is less than given threshold N, perform following Step:
Master controller is controlled based on the 2nd control strategy to sun light tracking control unit, and then makes photovoltaic cell group Part is located at the focal position of the photovoltaic array of optically focused field;Optically focused place aggregation sunlight on photovoltaic cell component, light The electric energy that photovoltaic cell components send is delivered directly in electrical network by grid-connecting apparatus;
If current electric grid state is electrical network limits grid-connected power transmission, following steps are performed:
Master controller is controlled based on the 1st control strategy to sun light tracking control unit, and then is located at heat extractor The focal position of the photovoltaic array of optically focused field;The sunlight of optically focused place aggregation is heated in heat extractor on heat extractor Heat-conducting fluid, high-temperature heat-conductive fluid storage to heat reservoir 5, realizes the storage of heat energy;
If current electric grid state is electrical network allows grid-connected power transmission and network load is higher than given threshold N, perform following Step:
Master controller performs procedure below:Master controller is carried out based on the 2nd control strategy to sun light tracking control unit Control, and then make photovoltaic cell component be located at the focal position of the photovoltaic array of optically focused field;The solar irradiation of optically focused place aggregation Penetrate on photovoltaic cell component, the electric energy that photovoltaic cell component sends is delivered directly in electrical network by grid-connecting apparatus;Meanwhile, always Controller starts heat generating system 6, and the converting heat that heat generating system 6 stores heat reservoir 5 is electric energy, then by grid-connected dress Put and be delivered directly in electrical network;It is achieved in the cogeneration of photovoltaic cell and heat energy.
As can be seen here, the present invention is provided photovoltaic and photothermal complementary power generation system and electricity-generating method, by high power concentrating photovoltaic Generating combines with solar energy thermal-power-generating technology complementation, with advantages below:
When it is not peak of power consumption that electrical network allows grid-connected power transmission, generated electricity using concentration photovoltaic system;When electrical network is limited System cannot grid-connected power transmission when, using heat absorption and heat-storing device, energy is stored in the form of heat energy;When electrical network allow it is grid-connected Power transmission and for peak of power consumption when, while using concentration photovoltaic system generate electricity and stored heat energy power-generating, so as to meet people Use demand.Therefore, the present invention effectively increases the utilization ratio of solar energy, increases generated energy.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should Depending on protection scope of the present invention.

Claims (6)

1. a kind of photovoltaic and photothermal complementary power generation system, it is characterised in that include:Optically focused field (1), sun light tracking control unit, Support tower (2), photovoltaic cell component (3), grid-connecting apparatus, heat extractor (4), heat reservoir (5), heat generating system (6), electrical network shape State detection means and master controller;
The optically focused field (1) is disposed with multiple photovoltaic arrays, each described photovoltaic array and the sun light tracking control unit Connection, by the sun light tracking control unit, according to the focal position of current setting, controls the appearance of the photovoltaic array State, realizes the maximization of the solar energy of the focal position of current setting;
The top of the support tower (2) fixedly mounts successively the photovoltaic cell component (3) and the suction by order from top to bottom Hot device (4);The outfan of the photovoltaic cell component (3) is connected with the grid-connecting apparatus, and by the grid-connecting apparatus, realizing will The electric energy that the photovoltaic cell component (3) sends is connected to the grid;The outfan of the heat extractor (4) and the heat reservoir (5) One end connection, the other end of the heat reservoir (5) be connected with one end of the heat generating system (6), and the heat generates electricity and is The other end of system (6) is connected to the grid-connecting apparatus, and by the grid-connecting apparatus, realization sends the heat generating system (6) Electric energy be connected to the grid;
The master controller respectively with the sun light tracking control unit, the heat generating system (6) and the electrical network shape State detection means connects.
2. a kind of photovoltaic and photothermal complementary power generation system according to claim 1, it is characterised in that the photovoltaic cell component (3) it is high power condensation photovoltaic battery component.
3. a kind of photovoltaic and photothermal complementary power generation system according to claim 2, it is characterised in that the high power concentrating photovoltaic Battery component is III-V multijunction solar cells.
4. a kind of photovoltaic and photothermal complementary power generation system according to claim 1, it is characterised in that the heat extractor (4) is Cavity type heat absorber or the external heat extractor of column type.
5. a kind of photovoltaic and photothermal complementary power generation system according to claim 4, it is characterised in that the heat extractor (4) Heat-transfer fluid is device of working medium, conduction oil or fused salt.
6. a kind of electricity-generating method of the photovoltaic and photothermal complementary power generation system described in any one of application claim 1-5, its feature exists In comprising the following steps:
Step 1, master controller storage heat extractor position coordinateses and photovoltaic cell component position coordinateses;Master controller is according to heat absorption Device position coordinateses, generate the 1st control strategy;Master controller generates the 2nd control strategy according to photovoltaic cell component position coordinateses; Wherein, the 1st control strategy is used for:Sun light tracking control unit is controlled, and then makes heat extractor be located at optically focused field Photovoltaic array focal position;2nd control strategy is used for:Sun light tracking control unit is controlled, and then is made Photovoltaic cell component is located at the focal position of the photovoltaic array of optically focused field;
Step 2, master controller obtains in real time electric network state by power grid state detecting device;Wherein, the electric network state includes Three kinds, respectively:Electrical network allows grid-connected power transmission and network load limits grid-connected power transmission, electrical network and allow less than given threshold N, electrical network Grid-connected power transmission and network load are higher than given threshold N;
If current electric grid state is electrical network allows grid-connected power transmission and network load is less than given threshold N, following steps are performed:
Master controller is controlled based on the 2nd control strategy to sun light tracking control unit, and then makes photovoltaic cell component position In the focal position of the photovoltaic array of optically focused field;Optically focused place aggregation sunlight on photovoltaic cell component, photovoltaic electric The electric energy that pond component sends is delivered directly in electrical network by grid-connecting apparatus;
If current electric grid state is electrical network limits grid-connected power transmission, following steps are performed:
Master controller is controlled based on the 1st control strategy to sun light tracking control unit, and then makes heat extractor be located at optically focused The focal position of the photovoltaic array of field;The sunlight of optically focused place aggregation heats the heat conduction in heat extractor on heat extractor Fluid, high-temperature heat-conductive fluid storage to heat reservoir (5), realizes the storage of heat energy;
If current electric grid state is electrical network allows grid-connected power transmission and network load is higher than given threshold N, following steps are performed:
Master controller performs procedure below:Master controller is controlled based on the 2nd control strategy to sun light tracking control unit, And then make photovoltaic cell component be located at the focal position of the photovoltaic array of optically focused field;The sunlight of optically focused place aggregation is in light On photovoltaic cell components, the electric energy that photovoltaic cell component sends is delivered directly in electrical network by grid-connecting apparatus;Meanwhile, master controller Start heat generating system (6), the converting heat that heat generating system (6) stores heat reservoir (5) is electric energy, then by grid-connected dress Put and be delivered directly in electrical network;It is achieved in the cogeneration of photovoltaic cell and heat energy.
CN201611193739.4A 2016-12-21 2016-12-21 Photovoltaic photo-thermal complementary power generation system and power generation method thereof Pending CN106685315A (en)

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CN109301861B (en) * 2018-09-14 2020-10-23 东南大学 Black start system for photovoltaic and photo-thermal system coordinated power generation and recovery method thereof
CN109724269A (en) * 2019-02-20 2019-05-07 清华四川能源互联网研究院 The full spectrum cogeneration system of solar energy and energy storage configuration method
CN109724269B (en) * 2019-02-20 2024-03-22 清华四川能源互联网研究院 Solar full-spectrum cogeneration system and energy storage configuration method
CN113465192A (en) * 2021-08-12 2021-10-01 西安热工研究院有限公司 Photovoltaic photo-thermal and thermal complementary energy supply and storage system
CN115276088A (en) * 2022-08-02 2022-11-01 国网甘肃省电力公司经济技术研究院 Optimal configuration method for heat storage capacity of opto-thermal power station in combined power generation system
CN115276088B (en) * 2022-08-02 2023-08-08 国网甘肃省电力公司经济技术研究院 Thermal power station heat storage capacity optimal configuration method in combined power generation system

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Application publication date: 20170517