CN112648156A - Solar photo-thermal power generation system and operation method thereof - Google Patents

Solar photo-thermal power generation system and operation method thereof Download PDF

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Publication number
CN112648156A
CN112648156A CN202011565929.0A CN202011565929A CN112648156A CN 112648156 A CN112648156 A CN 112648156A CN 202011565929 A CN202011565929 A CN 202011565929A CN 112648156 A CN112648156 A CN 112648156A
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CN
China
Prior art keywords
power generation
generation system
energy storage
solar photo
thermal power
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CN202011565929.0A
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Chinese (zh)
Inventor
徐能
宓霄凌
刘志娟
杨都堂
刘少超
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Zhejiang Supcon Solar Energy Technology Co Ltd
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Zhejiang Supcon Solar Energy Technology Co Ltd
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Priority to CN202011565929.0A priority Critical patent/CN112648156A/en
Publication of CN112648156A publication Critical patent/CN112648156A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03GSPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G6/00Devices for producing mechanical power from solar energy
    • F03G6/06Devices for producing mechanical power from solar energy with solar energy concentrating means
    • F03G6/065Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
    • F03G6/067Binary cycle plants where the fluid from the solar collector heats the working fluid via a heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03DWIND MOTORS
    • F03D9/00Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/007Adaptations 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
    • 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
    • H02S10/12Hybrid wind-PV energy systems
    • 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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • 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
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
    • 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
    • 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
    • Y02E10/70Wind energy
    • Y02E10/72Wind turbines with rotation axis in wind direction

Abstract

The invention relates to a solar photo-thermal power generation system and an operation method thereof, the system comprises a heat absorption unit, a solar light condensation unit, an energy storage unit, a heat exchange unit, a power generation unit and a weather prediction and power coordination control unit, wherein the weather prediction and power coordination control unit is used for predicting the weather condition of the area of the solar photo-thermal power generation system in a future preset working period and predicting the output curve of the photovoltaic power generation system and/or the wind power generation system in the area of the solar photo-thermal power generation system in the future preset working period according to the predicted weather condition so as to adjust the operation mode of the solar photo-thermal power generation system to meet the comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period, and simultaneously, the light abandoning rate and/or the wind abandoning rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.

Description

Solar photo-thermal power generation system and operation method thereof
Technical Field
The invention relates to the technical field of solar photo-thermal power generation, in particular to a solar photo-thermal power generation system and an operation method thereof.
Background
With the rapid development of clean energy such as photovoltaic power generation, wind power generation and the like, the proportion of the clean energy in a power grid is increased year by year, however, because the power generation conditions of photovoltaic power generation and wind power generation are greatly influenced by environmental factors, the power generation cannot be performed stably in one day, and the power generation can only be performed in the time period when the sun is sufficient and the wind power is sufficient, and generally, the time period when a large amount of photovoltaic power generation and wind power generation energy is generated is not the time period when the power load of the power grid is maximum, even the time period when the power load of the power grid is low, so that the electric quantity generated by photovoltaic power generation and wind power generation cannot be consumed, the conditions of light abandoning, wind abandoning and electricity abandoning are caused, and at the peak time of the power load, the photovoltaic wind power generation is always in the low valley period, the output of the large load cannot be.
Disclosure of Invention
In order to solve the above problems, the present invention provides a solar photo-thermal power generation system, comprising:
the heat absorption unit is used for absorbing sunlight to heat the low-temperature energy storage medium in the heat absorption unit so as to convert the low-temperature energy storage medium into a high-temperature energy storage medium;
the solar energy condensation unit is used for condensing sunlight to the heat absorption unit;
the energy storage unit comprises a low-temperature energy storage module and a high-temperature energy storage module, the low-temperature energy storage module is used for storing low-temperature energy storage media, the high-temperature energy storage module is used for storing high-temperature energy storage media, the low-temperature energy storage module is communicated with the inlet of the heat absorption unit through a pipeline, and the high-temperature energy storage module is communicated with the outlet of the heat absorption unit through a pipeline;
the heat exchange unit is used for realizing heat exchange between the high-temperature energy storage medium and the heat absorption working medium so as to transfer heat in the high-temperature energy storage medium to the heat absorption working medium;
the power generation unit is used for generating electric energy under the driving of the heat-absorbing working medium after absorbing heat and transmitting the electric energy to a regional power grid;
a weather forecasting and power coordinating control unit, configured to forecast weather conditions in a future preset working period of an area where the solar photo-thermal power generation system is located, and forecast an output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in the future preset working period according to the forecasted weather conditions, so as to adjust an operation mode of the solar photo-thermal power generation system, so that the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and a comprehensive output curve of the solar photo-thermal power generation system in the preset working period are superimposed to meet a comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period, and simultaneously, the light abandoning rate and/or the wind abandoning rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
Preferably, the heat exchange unit comprises an energy storage medium channel, an inlet of the energy storage medium channel is communicated with an outlet of the heat absorption unit through a pipeline, or/and an inlet of the energy storage medium channel is communicated with the high-temperature energy storage module through a pipeline; and the outlet of the energy storage medium channel is communicated with the low-temperature energy storage module through a pipeline.
Preferably, the energy storage device further comprises an electric heating unit, and the low-temperature energy storage module is communicated with the high-temperature energy storage module through the electric heating unit; or the low-temperature energy storage module is communicated with the high-temperature energy storage module through a connecting pipe, and the electric heating unit is arranged in the high-temperature energy storage module;
the electric heating unit is electrically connected with the regional power grid;
the electric heating unit is used for heating the low-temperature energy storage medium in the energy storage unit by using electric energy so as to convert the electric energy into heat energy; the electric energy required by the electric heating unit is generated by the photovoltaic power generation system and/or the wind power generation system in the area of the solar photo-thermal power generation system, and is the electric energy which exceeds the output requirement of the photovoltaic power generation system and/or the wind power generation system at each time point of the comprehensive output curve.
Preferably, the meteorological prediction and power coordination control unit comprises a meteorological monitoring unit, an operation and control center and a power coordination control unit, and the meteorological monitoring unit and the power coordination control unit are respectively and electrically connected with the operation and control center;
the meteorological monitoring unit is used for monitoring meteorological data of the area where the solar photo-thermal power generation system is located;
the electric power coordination control unit is used for adjusting the operation mode of the solar photo-thermal power generation system.
Preferably, the meteorological monitoring unit includes:
the DNI monitoring module is used for monitoring the DNI value of the area where the solar photo-thermal power generation system is located;
the cloud monitoring module is used for monitoring cloud shading information of an area where the solar photo-thermal power generation system is located;
the wind speed and wind direction monitoring module is used for monitoring the wind speed and the wind direction of the area where the solar photo-thermal power generation system is located;
the operation and control center is respectively and electrically connected with the DNI monitoring module, the cloud monitoring module and the wind speed and direction monitoring module and is used for predicting a meteorological condition of a future preset working period of the area where the solar photo-thermal power generation system is located according to meteorological data obtained by the DNI monitoring module, the cloud monitoring module and the wind speed and direction monitoring module.
Preferably, the power coordination control unit includes:
the electric heating control module is electrically connected with the electric heating unit and is used for adjusting the running state of the electric heating unit;
the energy storage control module is electrically connected with the energy storage unit and used for adjusting the residual energy storage capacity in the energy storage unit;
the light condensation control module is electrically connected with the solar light condensation unit and is used for adjusting the solar energy projected to the heat absorption unit by the solar light condensation unit;
and the power load balancing module is used for generating control instructions for the electric heating control module, the energy storage control module and the light gathering control module according to the adjustment requirement of the running state of the solar photo-thermal power generation system.
Preferably, the solar energy light-gathering unit is one of a heliostat, a trough reflector, a fresnel reflector or a dish reflector.
Preferably, the heat absorbing unit is one of a cavity type heat absorber, an external type heat absorber or a tubular heat absorber.
Preferably, the energy storage medium is selected from one of molten salt, heat conduction oil, liquid metal or solid particles; the heat absorption working medium is selected from one of water working medium and supercritical carbon dioxide.
The invention also provides an operation method of the solar photo-thermal power generation system, which comprises the following steps:
s1: predicting the meteorological condition in a future preset working period of the area where the solar photo-thermal power generation system is located;
s2: according to the predicted meteorological conditions, the output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in a future preset working period is predicted, the operation mode of the solar photo-thermal power generation system is further adjusted, the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system, and the light rejection rate and/or the wind rejection rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
Preferably, the step S1 includes:
s11: acquiring real-time meteorological conditions of an area where a solar photo-thermal power generation system is located;
s12: and correcting the predicted meteorological conditions in a future preset working period by using the real-time meteorological conditions.
Preferably, the meteorological conditions include DNI values, cloud cover information, and wind speed and direction information.
Preferably, the adjusting the operation mode of the solar photo-thermal power generation system in step S2 includes:
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is smaller than the comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment, adjusting the output curve of the solar photo-thermal power generation system in the preset working period, so that the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period;
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is equal to the comprehensive output requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system in the preset working period, adjusting the operation mode of the solar photo-thermal power generation system in the preset working period to ensure that the solar photo-thermal power generation system does not output power;
when the output power of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is larger than the comprehensive output power requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system in the preset working period, the operation mode of the solar photo-thermal power generation system is adjusted, so that the solar photo-thermal power generation system does not output power in the preset working period, meanwhile, the residual energy storage capacity of an energy storage unit in the solar photo-thermal power generation system is adjusted before the preset working period is reached, so that the energy storage unit can absorb the electric energy of the comprehensive output power requirement part of the photovoltaic power generation system and/or the wind power generation system and the regional power grid of the photovoltaic power generation system and/or the wind power generation system at the moment in the preset working period, and further ensure the light rejection rate and the light rejection rate of the photovoltaic power generation system and/or the wind power generation system in the preset working period Or the air abandon rate is less than or equal to a preset range.
Preferably, the adjustment of the remaining energy storage capacity of the energy storage unit in the solar photo-thermal power generation system is realized by adjusting the amount of the high-temperature energy storage medium stored in the energy storage unit, when the amount of the high-temperature energy storage medium stored in the energy storage unit is reduced, the remaining energy storage capacity of the energy storage unit is increased, and when the amount of the high-temperature energy storage medium stored in the energy storage unit is increased, the remaining energy storage capacity of the energy storage unit is reduced.
Preferably, the energy storage unit heats the low-temperature energy storage medium in the energy storage unit by utilizing the electric energy of the part required by the comprehensive output of the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment, so as to absorb the electric energy and convert the electric energy into heat energy.
Compared with the prior art, the invention has the following technical effects:
the solar photo-thermal power generation system of the invention can flexibly adjust the operation mode of the solar photo-thermal power generation system according to the dispatching requirement of the regional power grid by the weather forecast and power coordinated control unit, so that the output curve of the solar photo-thermal power generation system can be matched with the output curves of the photovoltaic power generation system and the wind power generation system in the region, the comprehensive output curve after the solar photo-thermal power generation system, the photovoltaic power generation system and/or the wind power generation system are integrated can meet the requirement of the regional power grid, meanwhile, by flexibly adjusting the energy storage unit, when the power generated by the photovoltaic power generation system and/or the wind power generation system is excessive, the redundant power can be stored in the solar photo-thermal power generation system in the form of heat energy, when the power generated by the photovoltaic power generation system and/or the wind power generation system is insufficient, the solar photo-thermal power generation system can release the stored heat energy, so that peak clipping and valley filling of the photovoltaic power generation system and/or the wind power generation system are realized, a comprehensive output curve after the photovoltaic power generation system, the photovoltaic power generation system and/or the wind power generation system are integrated meets the requirements of a regional power grid, and the phenomenon of wind and light abandoning is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram of a solar photo-thermal power generation system according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a weather forecast and power coordination control unit according to a preferred embodiment of the present invention.
Detailed Description
The solar photo-thermal power generation system provided by the present invention will be described in detail with reference to fig. 1 and fig. 2, the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the present invention within the scope that does not change the spirit and content of the present invention.
Referring to fig. 1 and 2, a solar photo-thermal power generation system is capable of being matched with a photovoltaic power generation system and/or a wind power generation system, and when electric energy generated by the photovoltaic power generation system and/or the wind power generation system is too much and a power grid cannot be consumed, the electric energy generated by the photovoltaic power generation system and/or the wind power generation system can be converted into heat energy to be stored in the solar photo-thermal power generation system; when the electric energy generated by the photovoltaic power generation system and/or the wind power generation system is insufficient, the solar photo-thermal power generation system can convert the stored heat energy into electric energy again to release the electric energy, so that peak clipping and valley filling of the photovoltaic power generation system and the wind power generation system can be realized. The solar photo-thermal power generation system comprises:
the heat absorption unit 1 is used for absorbing sunlight to heat a low-temperature energy storage medium in the heat absorption unit 1, so that the low-temperature energy storage medium is converted into a high-temperature energy storage medium;
a solar energy condensing unit 10 for condensing sunlight to the heat absorbing unit 1;
the energy storage unit comprises a low-temperature energy storage module 9 used for storing low-temperature energy storage media and a high-temperature energy storage module 8 used for storing high-temperature energy storage media, the low-temperature energy storage module 9 is communicated with the inlet of the heat absorption unit 1 through a pipeline, and the high-temperature energy storage module 8 is communicated with the outlet of the heat absorption unit 1 through a pipeline;
the heat exchange unit 6 is used for realizing heat exchange between the high-temperature energy storage medium and the heat absorption working medium so as to transfer heat in the high-temperature energy storage medium to the heat absorption working medium;
the power generation unit 5 is used for generating electric energy under the driving of the heat-absorbing working medium after absorbing heat and transmitting the electric energy to the regional power grid 4;
a weather prediction and power coordination control unit 7, configured to predict weather conditions in a future preset working period of the area where the solar photo-thermal power generation system is located, predict an output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in the future preset working period according to the predicted weather conditions, and further adjust an operation mode of the solar photo-thermal power generation system, so that a comprehensive output curve obtained by superimposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period with the output curve of the solar photo-thermal power generation system in the preset working period meets a comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period, and simultaneously, the light abandoning rate and/or the wind abandoning rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
The output curve refers to a continuous active power output change curve of the power generation system in a period of time.
In this embodiment, the solar photo-thermal power generation system may be an independent solar photo-thermal power station, or may be a photo-thermal power generation combination formed by combining two or more independent solar photo-thermal power stations; the photovoltaic power generation system can be an independent photovoltaic power station, and also can be a photovoltaic power generation combination body formed by combining two or more independent photovoltaic power stations; the wind power generation system can be an independent wind power generation station or a wind power generation combination formed by combining two or more wind power generation stations. The solar photo-thermal power generation system, the photovoltaic power generation system and the wind power generation system in the embodiment can be uniformly scheduled by the common regional power grid 4.
In this embodiment, the heat exchange unit 6 includes an energy storage medium channel and a heat absorption working medium channel for exchanging heat between a high temperature energy storage medium and a heat absorption working medium, an inlet of the energy storage medium channel is communicated with an outlet of the heat absorption unit 1 through a pipeline, or/and an inlet of the energy storage medium channel is communicated with the high temperature energy storage module 8 through a pipeline; and the outlet of the energy storage medium channel is communicated with the low-temperature energy storage module 9 through a pipeline.
The outlet of the heat absorption working medium channel is connected with the power generation unit 5, and as for whether the outlet of the heat absorption working medium channel is communicated with the power generation unit 5 or not, a circulation loop of the heat absorption working medium is formed, which is not particularly limited in this embodiment.
In this embodiment, the solar photo-thermal power generation system further includes an electric heating unit 2:
as an embodiment, the low-temperature energy storage module 9 is communicated with the high-temperature energy storage module 8 through the electric heating unit 2, that is, when the vehicle runs, the low-temperature energy storage medium in the low-temperature energy storage module 9 is firstly introduced into the electric heating unit 2, and is heated by the electric heating unit 2 and then is injected into the high-temperature energy storage module 8.
As another embodiment, the low-temperature energy storage module 9 and the high-temperature energy storage module 8 are communicated through a connecting pipe, and the electric heating unit is disposed in the high-temperature energy storage module, preferably at the bottom, that is, when the electric heating unit is in operation, the low-temperature energy storage medium in the low-temperature energy storage module 9 is introduced into the high-temperature energy storage module 8 through the connecting pipe, mixed with the high-temperature energy storage medium in the high-temperature energy storage module 8, and heated by the electric heating unit.
The electrical heating unit 2 is electrically connected to the regional power grid 4 by means of an electrical power cable 3.
The electric heating unit 2 is used for heating the low-temperature energy storage medium in the energy storage unit by using electric energy so as to convert the electric energy into heat energy; the electric energy required by the electric heating unit 2 is generated by the photovoltaic power generation system and/or the wind power generation system in the area of the solar photo-thermal power generation system, and is the electric energy which exceeds the output requirement of the photovoltaic power generation system and/or the wind power generation system at each time point of the comprehensive output curve.
In the present embodiment, the solar energy concentrating unit 10 is one of a heliostat, a trough reflector, a fresnel reflector, or a dish reflector.
The heat absorption unit 1 is one of a cavity type heat absorber, an external heat absorber or a tubular heat absorber.
The energy storage medium is selected from one of molten salt, heat conduction oil, liquid metal or solid particles; the heat absorption working medium is selected from one of water working medium and supercritical carbon dioxide.
In the present embodiment, the weather prediction and power coordination control unit 7 includes a weather monitoring unit 71, an arithmetic and control center 72 and a power coordination control unit 73, and the weather monitoring unit 71 and the power coordination control unit 73 are respectively electrically connected with the arithmetic and control center 72; the meteorological monitoring unit 71 is configured to monitor meteorological data of an area where the solar photo-thermal power generation system is located; the electric power coordination control unit 73 is used for adjusting the operation mode of the solar photo-thermal power generation system.
Further, the weather monitoring unit 71 includes:
a DNI monitoring module 713, configured to monitor a DNI value of an area where the solar photo-thermal power generation system is located;
the cloud monitoring module 712 is used for monitoring cloud shading information of the area where the solar photo-thermal power generation system is located;
the wind speed and direction monitoring module 711 is used for monitoring the wind speed and the wind direction of the area where the solar photo-thermal power generation system is located;
the operation and control center 72 is electrically connected to the DNI monitoring module 713, the cloud monitoring module 712 and the wind speed and direction monitoring module 711 respectively, and is configured to predict a meteorological condition of a future preset working period of the area where the solar photo-thermal power generation system is located according to meteorological data obtained by the DNI monitoring module 713, the cloud monitoring module 712 and the wind speed and direction monitoring module 711.
The power coordination control unit 73 includes:
an electric heating control module 731 electrically connected to the electric heating unit 2 for adjusting the operation state of the electric heating unit 2;
an energy storage control module 732 electrically connected to the energy storage unit for adjusting the remaining energy storage capacity in the energy storage unit;
the light condensation control module 733 is electrically connected with the solar light condensation unit 10 and is used for adjusting the solar energy projected to the heat absorption unit 1 by the solar light condensation unit 10;
the power load balancing module 734 is configured to generate control instructions for the electrical heating control module 731, the energy storage control module 732, and the light gathering control module 733 according to the adjustment requirement of the operating state of the solar photo-thermal power generation system.
The invention also provides an operation method of the solar photo-thermal power generation system, which can match the operation mode of the solar photo-thermal power generation system with the output curve of the photovoltaic power generation system or/and the wind power generation system and finally output electric energy required by load to a power grid. It includes:
s1: predicting the meteorological condition in a future preset working period of the area where the solar photo-thermal power generation system is located;
s2: according to the predicted meteorological conditions, the output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in a future preset working period is predicted, the operation mode of the solar photo-thermal power generation system is further adjusted, the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system, and the light rejection rate and/or the wind rejection rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
Further, the step S1 includes:
s11: acquiring real-time meteorological conditions of an area where a solar photo-thermal power generation system is located;
s12: and correcting the predicted meteorological conditions in a future preset working period by using the real-time meteorological conditions.
The meteorological conditions include DNI values, cloud shelter information, and wind speed and direction information.
The adjusting the operation mode of the solar photo-thermal power generation system in the step S2 includes:
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is smaller than the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment, adjusting the output curve of the solar photo-thermal power generation system in the preset working period, so that the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period;
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is equal to the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period, adjusting the operation mode of the solar photo-thermal power generation system in the preset working period to ensure that the solar photo-thermal power generation system does not output power;
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is larger than the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system in the preset working period, adjusting the operation mode of the solar photo-thermal power generation system to ensure that the solar photo-thermal power generation system does not output power in the preset working period, and simultaneously adjusting the residual energy storage capacity of the energy storage unit in the solar photo-thermal power generation system before the preset working period is reached to ensure that the energy storage unit can absorb part of the electric energy required by the photovoltaic power generation system and/or the wind power generation system to the comprehensive output requirement of the regional power grid 4 on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system at the moment in the preset working period, so as to ensure the light rejection rate and the comprehensive output requirement of the photovoltaic power generation system and/or the wind power generation system in the preset working And/or the air abandoning rate is less than or equal to a preset range.
In this embodiment, the adjustment of the remaining energy storage capacity of the energy storage unit in the solar photo-thermal power generation system is realized by adjusting the amount of the high-temperature energy storage medium stored in the energy storage unit, when the amount of the high-temperature energy storage medium stored in the energy storage unit is reduced, the remaining energy storage capacity of the energy storage unit is increased, and when the amount of the high-temperature energy storage medium stored in the energy storage unit is increased, the remaining energy storage capacity of the energy storage unit is reduced.
The energy storage unit heats the low-temperature energy storage medium in the energy storage unit by utilizing the electric energy of the part of the comprehensive output requirement of the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment, so that the electric energy is absorbed and converted into heat energy.

Claims (15)

1. A solar photo-thermal power generation system is characterized by comprising:
the heat absorption unit is used for absorbing sunlight to heat the low-temperature energy storage medium in the heat absorption unit so as to convert the low-temperature energy storage medium into a high-temperature energy storage medium;
the solar energy condensation unit is used for condensing sunlight to the heat absorption unit;
the energy storage unit comprises a low-temperature energy storage module and a high-temperature energy storage module, the low-temperature energy storage module is used for storing low-temperature energy storage media, the high-temperature energy storage module is used for storing high-temperature energy storage media, the low-temperature energy storage module is communicated with the inlet of the heat absorption unit through a pipeline, and the high-temperature energy storage module is communicated with the outlet of the heat absorption unit through a pipeline;
the heat exchange unit is used for realizing heat exchange between the high-temperature energy storage medium and the heat absorption working medium so as to transfer heat in the high-temperature energy storage medium to the heat absorption working medium;
the power generation unit is used for generating electric energy under the driving of the heat-absorbing working medium after absorbing heat and transmitting the electric energy to a regional power grid;
a weather forecasting and power coordinating control unit, configured to forecast weather conditions in a future preset working period of an area where the solar photo-thermal power generation system is located, and forecast an output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in the future preset working period according to the forecasted weather conditions, so as to adjust an operation mode of the solar photo-thermal power generation system, so that the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and a comprehensive output curve of the solar photo-thermal power generation system in the preset working period are superimposed to meet a comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period, and simultaneously, the light abandoning rate and/or the wind abandoning rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
2. The solar photo-thermal power generation system of claim 1, wherein the heat exchange unit comprises an energy storage medium channel, an inlet of the energy storage medium channel is communicated with an outlet of the heat absorption unit through a pipeline, or/and an inlet of the energy storage medium channel is communicated with the high temperature energy storage module through a pipeline; and the outlet of the energy storage medium channel is communicated with the low-temperature energy storage module through a pipeline.
3. The solar photo-thermal power generation system of claim 1, further comprising an electrical heating unit, wherein the low temperature energy storage module is communicated with the high temperature energy storage module through the electrical heating unit; or the low-temperature energy storage module is communicated with the high-temperature energy storage module through a connecting pipe, and the electric heating unit is arranged in the high-temperature energy storage module;
the electric heating unit is electrically connected with the regional power grid;
the electric heating unit is used for heating the low-temperature energy storage medium in the energy storage unit by using electric energy so as to convert the electric energy into heat energy; the electric energy required by the electric heating unit is generated by the photovoltaic power generation system and/or the wind power generation system in the area of the solar photo-thermal power generation system, and is the electric energy which exceeds the output requirement of the photovoltaic power generation system and/or the wind power generation system at each time point of the comprehensive output curve.
4. The solar photo-thermal power generation system of claim 3, wherein the weather prediction and power coordination control unit comprises a weather monitoring unit, a calculation and control center and a power coordination control unit, the weather monitoring unit and the power coordination control unit are respectively electrically connected with the calculation and control center;
the meteorological monitoring unit is used for monitoring meteorological data of the area where the solar photo-thermal power generation system is located;
the electric power coordination control unit is used for adjusting the operation mode of the solar photo-thermal power generation system.
5. The solar photothermal power system of claim 4 wherein said meteorological monitoring unit comprises:
the DNI monitoring module is used for monitoring the DNI value of the area where the solar photo-thermal power generation system is located;
the cloud monitoring module is used for monitoring cloud shading information of an area where the solar photo-thermal power generation system is located;
the wind speed and wind direction monitoring module is used for monitoring the wind speed and the wind direction of the area where the solar photo-thermal power generation system is located;
the operation and control center is respectively and electrically connected with the DNI monitoring module, the cloud monitoring module and the wind speed and direction monitoring module and is used for predicting a meteorological condition of a future preset working period of the area where the solar photo-thermal power generation system is located according to meteorological data obtained by the DNI monitoring module, the cloud monitoring module and the wind speed and direction monitoring module.
6. The solar photo-thermal power generation system of claim 5, wherein the power coordination control unit comprises:
the electric heating control module is electrically connected with the electric heating unit and is used for adjusting the running state of the electric heating unit;
the energy storage control module is electrically connected with the energy storage unit and used for adjusting the residual energy storage capacity in the energy storage unit;
the light condensation control module is electrically connected with the solar light condensation unit and is used for adjusting the solar energy projected to the heat absorption unit by the solar light condensation unit;
and the power load balancing module is used for generating control instructions for the electric heating control module, the energy storage control module and the light gathering control module according to the adjustment requirement of the running state of the solar photo-thermal power generation system.
7. The solar photo-thermal power generation system of claim 1, wherein the solar concentrating unit is one of a heliostat, a trough reflector, a fresnel reflector or a dish reflector.
8. The solar photothermal power system of claim 1 wherein said heat absorbing unit is one of a cavity type heat absorber, an external type heat absorber or a tubular heat absorber.
9. The solar photothermal power system of claim 1 wherein said energy storage medium is selected from one of molten salt, thermal oil, liquid metal or solid particles; the heat absorption working medium is selected from one of water working medium and supercritical carbon dioxide.
10. An operation method of a solar photo-thermal power generation system is characterized by comprising the following steps:
s1: predicting the meteorological condition in a future preset working period of the area where the solar photo-thermal power generation system is located;
s2: according to the predicted meteorological conditions, the output curve of the photovoltaic power generation system and/or the wind power generation system in the area where the solar photo-thermal power generation system is located in a future preset working period is predicted, the operation mode of the solar photo-thermal power generation system is further adjusted, the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system, and the light rejection rate and/or the wind rejection rate of the photovoltaic power generation system and/or the wind power generation system are smaller than or equal to a preset range.
11. The method for operating a solar photo-thermal power generation system according to claim 10, wherein the step S1 includes:
s11: acquiring real-time meteorological conditions of an area where a solar photo-thermal power generation system is located;
s12: and correcting the predicted meteorological conditions in a future preset working period by using the real-time meteorological conditions.
12. The method of claim 10, wherein the meteorological conditions comprise DNI values, cloud shading information, and wind speed and direction information.
13. The method of claim 10, wherein the step S2 of adjusting the operation mode of the solar photo-thermal power generation system comprises:
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is smaller than the comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment, adjusting the output curve of the solar photo-thermal power generation system in the preset working period, so that the comprehensive output curve obtained by superposing the output curve of the photovoltaic power generation system and/or the wind power generation system in the preset working period and the output curve of the solar photo-thermal power generation system in the preset working period meets the comprehensive output requirement of the regional power grid on the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system in the preset working period;
when the output of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is equal to the comprehensive output requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system in the preset working period, adjusting the operation mode of the solar photo-thermal power generation system in the preset working period to ensure that the solar photo-thermal power generation system does not output power;
when the output power of the photovoltaic power generation system and/or the wind power generation system in a future preset working period is larger than the comprehensive output power requirement of the regional power grid on the photovoltaic power generation system, the wind power generation system and the solar photo-thermal power generation system in the preset working period, the operation mode of the solar photo-thermal power generation system is adjusted, so that the solar photo-thermal power generation system does not output power in the preset working period, meanwhile, the residual energy storage capacity of an energy storage unit in the solar photo-thermal power generation system is adjusted before the preset working period is reached, so that the energy storage unit can absorb the electric energy of the comprehensive output power requirement part of the photovoltaic power generation system and/or the wind power generation system and the regional power grid of the photovoltaic power generation system and/or the wind power generation system at the moment in the preset working period, and further ensure the light rejection rate and the light rejection rate of the photovoltaic power generation system and/or the wind power generation system in the preset working period Or the air abandon rate is less than or equal to a preset range.
14. The operating method of a solar photo-thermal power generation system according to claim 13, wherein the adjustment of the remaining energy storage capacity of the energy storage unit in the solar photo-thermal power generation system is performed by adjusting the amount of the high-temperature energy storage medium stored in the energy storage unit, wherein the remaining energy storage capacity of the energy storage unit is increased when the amount of the high-temperature energy storage medium stored in the energy storage unit is decreased, and wherein the remaining energy storage capacity of the energy storage unit is decreased when the amount of the high-temperature energy storage medium stored in the energy storage unit is increased.
15. The operating method of a solar photo-thermal power generation system according to claim 13, wherein the energy storage unit absorbs the electric energy by heating the low-temperature energy storage medium in the energy storage unit with the electric energy of the portion of the comprehensive output requirement of the photovoltaic power generation system and/or the wind power generation system and the solar photo-thermal power generation system at the moment by using the grid of the photovoltaic power generation system and/or the wind power generation system.
CN202011565929.0A 2020-12-25 2020-12-25 Solar photo-thermal power generation system and operation method thereof Pending CN112648156A (en)

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