CN107332272B - Output power calculation method for air cooling photovoltaic-photothermal power generation system - Google Patents
Output power calculation method for air cooling photovoltaic-photothermal power generation system Download PDFInfo
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Abstract
The embodiment of the invention discloses an output power calculation method of an air-cooled photovoltaic-photothermal power generation system, which is used for solving the technical problems that in the prior art, uncertainty and randomness of influencing factors are not fully considered in a calculation method of daily generated energy of a distributed photovoltaic power generation system of a new energy user, and the applicability, the practicability and the applicability of the calculation method are difficult to meet. The method provided by the embodiment of the invention comprises the following steps: establishing a calculation method of the generating efficiency and the output power of the photovoltaic generating system by utilizing the fact that the increasing value of the generating efficiency of the photovoltaic generating plate is in direct proportion to the temperature decreasing value of the generating plate caused by air cooling; a calculation method for the generating efficiency and the output power of the photo-thermal generating system is established by utilizing the direct proportion relation between the generating efficiency increasing value of the photo-thermal generating system and the air temperature increasing value of the closed space system for storing the fused salt energy storage, and the output power of the air cooling photovoltaic-photo-thermal generating system is comprehensively calculated.
Description
Technical Field
The invention relates to the field of electric power systems and automation thereof, in particular to a method for calculating output power of an air-cooled photovoltaic-photothermal power generation system.
Background
The development of a solar distributed power generation system is the development trend of smart cities, and photovoltaic power generation and photo-thermal power generation are two different forms of solar power generation. In recent years, a photovoltaic-photothermal integrated distributed power generation system becomes a mainstream development direction and a subject of research hot spot.
The principle of photovoltaic power generation is that solar heat energy is directly converted into electric energy by utilizing the temperature difference of semiconductor or metal materials such as vacuum devices, alkali metals, magnetic fluids and the like, so as to realize power generation. The principle of photo-thermal power generation is that working media such as air and the like are heated to high-temperature high-pressure air steam in a light-gathering and heat-collecting mode, the high-temperature high-pressure air steam drives a heat engine such as a steam turbine and the like, the heat engine drives a generator set to generate power, and the power generation is realized by utilizing conversion of various energy sources such as sunlight, heat, a machine and electricity.
At present, photovoltaic power generation becomes a very mature technology, and the power generation cost is reduced to 7000 ten thousand yuan/ten thousand kilowatt of air level. The photothermal power generation mainly comprises four types, namely tower type, groove type, disc type and Fresnel type. The principle of the trough type solar photo-thermal power generation system is that a plurality of series-parallel trough type paraboloid concentrating collectors are used for concentrating solar heat, a working medium is heated to high-temperature high-pressure steam, and then a steam turbine generator set is driven to generate power. The power generation principle of the disc type solar photo-thermal power generation system is that a parabolic reflector is composed of a plurality of mirrors, solar light is focused on the focus of the parabolic reflector, and working media in the parabolic receiver are heated to high-temperature high-pressure steam to drive a generator to generate power. The Fresnel type photo-thermal power generation system has the power generation principle that a condenser with a Fresnel structure is adopted to collect solar heat, heat working media to high-temperature high-pressure steam, and drive a steam turbine generator set to generate power, and the Fresnel type photo-thermal power generation system is low in power generation efficiency, simple in structure and low in construction and maintenance cost. The principle of the tower type solar thermal power generation system is that a central absorption tower top absorber collects solar heat, a working medium is heated to high-temperature high-pressure steam, a steam turbine generator set is driven to generate power, a certain number of heliostats are installed around a tower, sunlight is collected to a cavity of a tower top receiver through the heliostats, the working medium is heated to generate high-temperature steam, and the steam turbine generator set is driven to generate power. The photo-thermal power generation modes are all that the steam turbine is driven to generate power by converting light into heat and then generating steam.
The radiation intensity and the sunshine time of sunlight in different areas have great difference, the sunshine intensity in different time and space also has great difference, randomness and ambiguity due to the fact that the cloud layer shields to form a shadow in the same place, and the uncertain characteristic determines that the output of the photovoltaic and photo-thermal power generation system also has great difference, randomness and ambiguity. Therefore, to determine the output power of the photovoltaic and photothermal power generation system, the solar radiation intensity and the sunshine duration in the area need to be subjected to probability analysis or fuzzy analysis and probability fuzzy analysis, and the sunshine intensity at different time and space needs to be subjected to probability analysis or fuzzy analysis and probability fuzzy analysis.
By utilizing the continuous power generation principle of battery energy storage, the photovoltaic power generation system can continuously generate power or continuously generate power in cloudy days or at night. But the continuous power generation or continuous power generation capacity depends on factors such as battery energy storage capacity, efficiency, control mode and the like, and the factors influence the output power air level of the battery energy storage continuous power generation system. The continuous power generation or the continuous power generation can be realized by utilizing the fused salt energy storage when the photo-thermal power generation is carried out in the cloudy day or at night. Like photovoltaic power generation, the continuous power generation or continuous power generation capacity of the photo-thermal power generation system depends on factors such as fused salt energy storage capacity, energy conversion efficiency, flexible control mode and the like, and the output power air level of the photo-thermal power generation system has high randomness and ambiguity due to the influence of various uncertain factors.
Renewable energy sources of all countries around the world have a rapid growth trend in recent years in power grid access. The photovoltaic power generation access is the fastest to increase, and the annual growth rate is 60 percent; secondly, wind power generation and biofuel power generation are carried out, and the annual growth rate is respectively 27% and 18%. The department of industry and informatization predicts that the nationwide electric automobile reserves will reach 6000 million in 2030 years, the peak charging power will reach 0.42TW, accounting for 18% of the expected total installed capacity of 2.32 TW. Therefore, the large-scale access of distributed power generation, energy storage and electric vehicle charging systems to urban power distribution networks is a necessary trend. With the interactive support and promotion of national policies and industrial development, in a certain space, for example, small users such as urban residents and large user groups such as commercial buildings, communities and industrial areas, the distributed photovoltaic power generation system tends to develop rapidly, and the photovoltaic and photothermal power generation integrated system also shows a strong development situation. The distributed energy storage system is a distributed system with fixed access voltage level and access point, and comprises compressed hydrogen energy storage, battery energy storage, super capacitor energy storage and the like, and the energy storage power is flexible and controllable; the distributed charging system of the electric automobile is a distributed system with variable access voltage levels and access points, the charging power can be flexibly controlled, and the randomness is extremely high. The distributed generation volatility, the intermittence, the randomness and the charging uncertainty of the electric automobile enable a single new energy user to have more randomness in power generation, power utilization and charging, and the randomness and the ambiguity of the output power of the new energy user can be further increased by the interaction relationship between small users such as urban residents and the like and large user groups such as commercial buildings, communities and industrial areas in distributed generation, energy storage and electric automobile charging systems.
For random uncertainty, probability statistics theory is conventionally used to analyze and process information of random uncertainty, such as constructing a probability model of an uncertainty event or parameter by using a probability density function and a probability distribution function with mean and variance as characteristic values, and describing occurrence probability characteristics of the uncertainty event and fluctuation characteristics of uncertainty parameters such as power, voltage and current.
Distributed photovoltaic power generation systems for small users such as urban residents and large user groups such as commercial buildings, communities and industrial areas are systems with random and fuzzy uncertain events or parameters which have complex relationships and interaction. Under the influence of various uncertain random and fuzzy events or parameters, the daily generated energy of new energy small users such as urban residents and the like and new energy large user groups such as commercial buildings, communities and industrial areas with distributed photovoltaic power generation systems becomes more random and fuzzy. The daily power generation amount of the conventional new energy user distributed photovoltaic power generation system usually adopts a deterministic calculation method, and some systems also adopt an uncertain calculation method of probability analysis. The deterministic calculation method is generally used for calculating the daily power generation amount of the distributed photovoltaic power generation system of the new energy users under the condition that the solar radiation intensity, the sunshine time, the sunshine intensity, the sunshine shadow and the sunshine deflection angle of the user location in different time and space are all determined in an assumed area, the influences of factors such as the battery energy storage capacity of the photovoltaic power generation system for continuous power generation or the fused salt energy storage installed capacity, the energy storage state, the energy conversion efficiency, the power distribution network voltage regulation requirement, the flexible control mode and the like of the photo-thermal power generation system are not considered, the calculation result is unique and deterministic, and the actual condition of the daily power generation amount of the distributed photovoltaic power generation system of the new energy users cannot be reflected frequently. The calculation method of probability analysis is generally to calculate the daily generated energy of the distributed photovoltaic power generation system of the new energy users under the condition that only single factors such as sunlight intensity are assumed as uncertainty factors, and the calculation result is a probability value with a certain confidence air level. Actually, the daily power generation amount of the photovoltaic power generation system of the new energy user is determined by the solar radiation intensity, the sunshine duration and the probability or ambiguity thereof in the region, the sunshine intensity, the sunshine duration, the sunshine shadow, the sunshine deflection angle and the probability or ambiguity thereof in different time and space at the location of the user, and the solar power generation system also depends on the battery energy storage capacity of the photovoltaic power generation system as continuous power generation or the fuse salt energy storage installed capacity, the energy storage state, the energy conversion efficiency, the power distribution network voltage regulation requirement, the flexible control mode and other factors of the photovoltaic power generation system. Moreover, these influencing factors are typically random uncertainties or fuzzy uncertainties, or they are random and fuzzy uncertainties, often present as random and fuzzy uncertainty events or quantities. Therefore, the uncertainty and randomness of the influence factors are not considered comprehensively in the prior art of the calculation of the daily generated energy of the distributed photovoltaic power generation system of the new energy users, and the applicability, the practicability and the applicability of the calculation method are difficult to meet.
Disclosure of Invention
The embodiment of the invention provides an output power calculation method of an air-cooled photovoltaic-photothermal power generation system, and solves the technical problems that in the prior art, uncertainty and randomness of influencing factors are not fully considered in a calculation method of daily generated energy of a distributed photovoltaic power generation system of a new energy user, and the applicability, the practicability and the applicability of the calculation method are difficult to meet.
The embodiment of the invention provides a method for calculating the output power of an air cooling photovoltaic-photothermal power generation system, which comprises the following steps:
the air cooling photovoltaic-photothermal power generation system comprises a photovoltaic power generation system, a photothermal power generation system, a photovoltaic power generation cooling air system and a fused salt energy storage closed space system, wherein the photovoltaic power generation system comprises a solar photovoltaic power generation plate;
the method comprises the following steps: calculating a temperature reduction value of the solar photovoltaic power generation panel according to the obtained inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system;
calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel;
calculating the effective sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located;
calculating the power generation power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
calculating a power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the environmental temperature of the closed space system for storing the molten salt energy;
calculating the amount of high-temperature and high-pressure steam available for the air cooling photovoltaic-photothermal power generation system according to the effective sunlight intensity;
calculating the power generation power of the photo-thermal power generation system according to the high-temperature high-pressure steam quantity;
and calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system.
Optionally, calculating a temperature reduction value of the solar photovoltaic power generation panel according to the obtained inlet cold air temperature, outlet hot air temperature and ambient temperature of the photovoltaic power generation cooling air system includes:
according to the obtained inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system, calculating a temperature reduction value of the solar photovoltaic power generation panel through a power generation panel temperature reduction value calculation formula, wherein the power generation panel temperature reduction value calculation formula specifically comprises the following steps:
wherein k iscoolResponse coefficient, T, of the value of temperature drop of the photovoltaic panel to the difference between the outlet and inlet water temperatures of the cooling water system of the photovoltaic panelEIs ambient temperature.
Optionally, the calculating the increased value of the generating efficiency of the photovoltaic power generating system according to the decreased value of the temperature of the solar photovoltaic power generating panel includes:
calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel and a photovoltaic power generation efficiency increase value calculation formula, wherein the photovoltaic power generation efficiency increase value calculation formula specifically comprises the following steps:
ΔePV＝kA,coolΔTPV+kB,cool；
wherein k isA,cool、kB,coolThe power generation effect coefficients of air cooling of the air cooling photovoltaic thermal system are all the power generation effect coefficients.
Alternatively, calculating the effective solar radiation intensity of the area where the air-cooled photovoltaic-thermal power generation system is located from the solar radiation intensity of the area where the air-cooled photovoltaic-thermal power generation system is located includes:
according to the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, calculating the effective sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located through an effective sunshine intensity calculating formula, wherein the effective sunshine intensity calculating formula specifically comprises the following steps:
Eeff＝ηSTηSYηSAE(1-kTE)；
wherein E is the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, and the unit is W/m2；ηST、ηSY、ηSAThe influence coefficients of the sunshine time, the sunshine shadow and the sunshine deflection angle on the sunshine intensity are respectively; k is a radical ofTEK is an environmental influence coefficient of 0 or moreTE≤1。
Optionally, calculating the generated power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel includes:
calculating the generating power of the photovoltaic power generation panel through a generating power solving formula of the power generation panel according to the effective generating area of the photovoltaic power generation panel, wherein the generating power solving formula of the power generation panel specifically comprises the following steps:
PPV＝pSTpSYpSA(1+ΔePV)APVkPVEEeff；
wherein A isPVFor air cooling the effective generating area of photovoltaic power generation board of photovoltaic thermal system, unit is m2；pST、pSY、pSAThe probability of the interval property of the sunshine time, the probability of the sunshine shadow and the probability of the sunshine deflection angle of the air cooling photovoltaic thermal system are respectively.
Optionally, calculating the power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature of the closed space system for storing molten salt energy and the acquired ambient temperature includes:
generating through light and heat according to the obtained temperature and the environment temperature of the closed space system for storing energy by fused salt
The electrical efficiency added value calculating formula calculates the generating efficiency added value of the photo-thermal generating system, and the photo-thermal generating efficiency added value calculating formula specifically comprises:
ΔeCSP＝ηH(TH-TE)；
wherein, ηHThe coefficient of power generation effect, T, is formed by inputting high-temperature air from a photovoltaic thermal system into a closed space system for storing energy by fused saltHThe temperature of the closed space system for storing the molten salt.
Optionally, calculating the amount of high-temperature and high-pressure steam available to the air-cooled photovoltaic-photothermal power generation system from the effective solar intensity comprises:
calculating the available high-temperature high-pressure steam quantity of the air cooling photovoltaic-photothermal power generation system through a steam quantity calculation formula according to the effective sunlight intensity, wherein the steam quantity calculation formula is specifically as follows:
wherein f isCSP2、fCSP1、fCSP0All the solar thermal power generation systems have the light efficiency coefficient of a heat collector with a certain volume.
Optionally, calculating the generated power of the photo-thermal power generation system according to the high-temperature high-pressure steam amount includes:
the generating power of the photo-thermal generating system is calculated through a photo-thermal generating power solving formula according to the high-temperature high-pressure steam quantity, and the photo-thermal generating power solving formula specifically comprises the following steps:
wherein, WCSPPhoto-thermal power generation system for air cooling photovoltaic-photo-thermal power generation systemThe amount of hot air of high temperature and high pressure available to the system is m3(ii) a a. b and c are power coefficients related to the amount of high-temperature and high-pressure hot air available for the photo-thermal power generation system of the air-cooled photovoltaic-photo-thermal power generation system respectively.
Alternatively, calculating the output power of the air-cooled photovoltaic-thermal power generation system from the generated power of the photovoltaic power generation panel and the generated power of the thermal power generation system includes:
calculating the output power of the air cooling photovoltaic-photothermal power generation system through a system output power calculation formula according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system, wherein the system output power calculation formula specifically comprises the following steps:
PPV-CSP＝ηDC/ACPPV+PCSPΔeCSP；
wherein, ηDC/ACThe conversion efficiency of the inverter of the photovoltaic power generation system is improved.
The embodiment of the invention provides an output power calculation device of an air cooling photovoltaic-photothermal power generation system, which comprises:
the first calculation module is used for calculating a temperature reduction value of the solar photovoltaic power generation panel according to the acquired inlet cold air temperature, outlet hot air temperature and ambient temperature of the photovoltaic power generation cooling air system;
the second calculation module is used for calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel;
the third calculation module is used for calculating the effective sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located;
the fourth calculation module is used for calculating the power generation power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
the fifth calculation module is used for calculating the power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the environmental temperature of the closed space system for storing the energy of the molten salt;
the sixth calculation module is used for calculating the amount of high-temperature and high-pressure steam available for the air cooling photovoltaic-photothermal power generation system according to the effective sunlight intensity;
the seventh calculation module is used for calculating the power generation power of the photo-thermal power generation system according to the high-temperature high-pressure steam quantity;
and the eighth calculation module is used for calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention provides a method for calculating the output power of an air-cooled photovoltaic-photothermal power generation system, which is used for establishing a method for calculating the power generation efficiency and the output power of the photovoltaic power generation system by utilizing the fact that the power generation efficiency increase value of a photovoltaic power generation plate is in direct proportion to the temperature decrease value of the power generation plate caused by air cooling; the method is characterized in that a calculation method for generating efficiency and output power of a photo-thermal power generation system is established by utilizing the direct proportion relation between the added value of the generating efficiency of the photo-thermal power generation system and the increased value of the air temperature of a closed space system for storing molten salt energy, the influence mechanism of the random characteristics, fuzzy characteristics, probability characteristics and fuzzy distribution rules of parameters such as sunlight intensity, sunlight time, sunlight shadow, sunlight deflection angle and the like on the output power of an air-cooled photovoltaic-photo-thermal power generation system is reflected, theoretical guidance is provided for the prediction of the generating output of the air-cooled photovoltaic-photo-thermal power generation system, necessary technical support is provided for distributed new energy power generation and intelligent power grid dispatching operation, and the problems that the uncertainty and the randomness of the influence factors are not considered comprehensively in the calculation method for the daily generated energy of the distributed photovoltaic power generation system of new, The practicability and the applicability are difficult to meet.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for calculating output power of an air-cooled photovoltaic-photothermal power generation system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air-cooled photovoltaic-photothermal power generation system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an output power calculation device of an air-cooled photovoltaic-photothermal power generation system according to an embodiment of the present invention.
In the illustration, 1 is a low-temperature air input pipe of a photovoltaic thermal system, an upper top plate of the photovoltaic thermal system is a photovoltaic power generation plate, and a lower layer of the photovoltaic thermal system is a photovoltaic power generation cooling air system composed of air pipes arranged according to a certain rule; 2 is a photovoltaic power generation system; 3, a photovoltaic power generation cooling air system; 4 is a high-temperature air output pipe of the photovoltaic thermal system; 5 is a photovoltaic thermal system high-temperature air storage system; 6 is a high-temperature air output pipe of the high-temperature air storage system of the photovoltaic thermal system; 7 is a closed space system for placing molten salt for storing energy; 8 is a sunlight condenser; 9 is a light collector of the photo-thermal power generation system; 10, a light boiler of the photo-thermal power generation system is used for generating high-temperature and high-pressure air steam; 11 is a light boiler water input pipe of the photo-thermal power generation system; 12 is a ventilation pipe of a closed space system for placing molten salt energy storage; 13 is a high-temperature high-pressure air steam output pipe of a light boiler of the photo-thermal power generation system; 14 is a steam turbine generator unit; 15 is a low-voltage bus of the photo-thermal power generation system; 16 is a photo-thermal power generation system transformer; 17 is a high-voltage bus of the photovoltaic-photothermal integrated power generation system; 18 is a high-voltage side reactive power compensation device of the photovoltaic-photothermal integrated power generation system, wherein a static reactive generator is adopted; 19 is a low-voltage side energy storage system of the photovoltaic power generation system; 20 is a low-voltage bus of the photovoltaic power generation system; 21 is a photovoltaic power generation system transformer; 22 is a heat pipe from a condenser and is also a light and heat input pipe of the fused salt energy storage system; 23 is a fused salt energy storage system; and 24 is a photo-thermal output pipe of the fused salt energy storage system.
Detailed Description
The embodiment of the invention provides an output power calculation method of an air-cooled photovoltaic-photothermal power generation system, which is used for solving the technical problems that in the prior art, uncertainty and randomness of influence factors are not fully considered in a calculation method of daily generated energy of a distributed photovoltaic power generation system of a new energy user, and the applicability, the practicability and the applicability of the calculation method are difficult to meet.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for calculating an output power of an air-cooled photovoltaic-photothermal power generation system according to an embodiment of the present invention includes:
the air cooling photovoltaic-photothermal power generation system comprises a photovoltaic power generation system, a photothermal power generation system, a photovoltaic power generation cooling air system and a fused salt energy storage closed space system, wherein the photovoltaic power generation system comprises a solar photovoltaic power generation plate;
the method comprises the following steps: 101. calculating a temperature reduction value of the solar photovoltaic power generation panel according to the obtained inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system;
according to the obtained inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system, calculating a temperature reduction value of the solar photovoltaic power generation panel through a power generation panel temperature reduction value calculation formula, wherein the power generation panel temperature reduction value calculation formula specifically comprises the following steps:
wherein k iscoolFor the temperature reduction value of the photovoltaic power generation panel, the outlet and the inlet of a cooling water system of the photovoltaic power generation panelResponse coefficient of water temperature difference, TEIs ambient temperature.
It should be noted that the output power calculation method of the air-cooled photovoltaic-photothermal power generation system provided by the embodiment of the invention is mainly directed to the air-cooled photovoltaic-photothermal power generation system. The structure of the air-cooled photovoltaic-photothermal power generation system is shown in fig. 2.
102. Calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel;
calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel and a photovoltaic power generation efficiency increase value calculation formula, wherein the photovoltaic power generation efficiency increase value calculation formula specifically comprises the following steps:
ΔePV＝kA,coolΔTPV+kB,cool；
wherein k isA,cool、kB,coolThe power generation effect coefficients of air cooling of the air cooling photovoltaic thermal system are all the power generation effect coefficients.
103. Calculating the effective sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located;
according to the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, calculating the effective sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located through an effective sunshine intensity calculating formula, wherein the effective sunshine intensity calculating formula specifically comprises the following steps:
Eeff＝ηSTηSYηSAE(1-kTE)；
wherein E is the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, and the unit is W/m2；ηST、ηSY、ηSAThe influence coefficients of the sunshine time, the sunshine shadow and the sunshine deflection angle on the sunshine intensity are respectively; k is a radical ofTEK is an environmental influence coefficient of 0 or moreTE≤1。
104. Calculating the power generation power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
calculating the generating power of the photovoltaic power generation panel through a generating power solving formula of the power generation panel according to the effective generating area of the photovoltaic power generation panel, wherein the generating power solving formula of the power generation panel specifically comprises the following steps:
PPV＝pSTpSYpSA(1+ΔePV)APVkPVEEeff；
wherein A isPVFor air cooling the effective generating area of photovoltaic power generation board of photovoltaic thermal system, unit is m2；pST、pSY、pSAThe probability of the interval property of the sunshine time, the probability of the sunshine shadow and the probability of the sunshine deflection angle of the air cooling photovoltaic thermal system are respectively.
105. Calculating a power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the environmental temperature of the closed space system for storing the molten salt energy;
generating through light and heat according to the obtained temperature and the environment temperature of the closed space system for storing energy by fused salt
The electrical efficiency added value calculating formula calculates the generating efficiency added value of the photo-thermal generating system, and the photo-thermal generating efficiency added value calculating formula specifically comprises:
ΔeCSP＝ηH(TH-TE)；
wherein, ηHThe coefficient of power generation effect, T, is formed by inputting high-temperature air from a photovoltaic thermal system into a closed space system for storing energy by fused saltHThe temperature of the closed space system for storing the molten salt.
106. Calculating the amount of high-temperature and high-pressure steam available for the air cooling photovoltaic-photothermal power generation system according to the effective sunlight intensity;
calculating the available high-temperature high-pressure steam quantity of the air cooling photovoltaic-photothermal power generation system through a steam quantity calculation formula according to the effective sunlight intensity, wherein the steam quantity calculation formula is specifically as follows:
wherein f isCSP2、fCSP1、fCSP0All the solar thermal power generation systems have the light efficiency coefficient of a heat collector with a certain volume.
107. Calculating the power generation power of the photo-thermal power generation system according to the high-temperature high-pressure steam quantity;
the generating power of the photo-thermal generating system is calculated through a photo-thermal generating power solving formula according to the high-temperature high-pressure steam quantity, and the photo-thermal generating power solving formula specifically comprises the following steps:
wherein, WCSPThe amount of high-temperature high-pressure hot air available for the photo-thermal power generation system of the air-cooled photovoltaic-photo-thermal power generation system is m3(ii) a a. b and c are power coefficients related to the amount of high-temperature and high-pressure hot air available for the photo-thermal power generation system of the air-cooled photovoltaic-photo-thermal power generation system respectively.
108. And calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system.
Calculating the output power of the air cooling photovoltaic-photothermal power generation system through a system output power calculation formula according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system, wherein the system output power calculation formula specifically comprises the following steps:
PPV-CSP＝ηDC/ACPPV+PCSPΔeCSP；
wherein, ηDC/ACThe conversion efficiency of the inverter of the photovoltaic power generation system is improved.
The embodiment of the invention provides a method for calculating the output power of an air-cooled photovoltaic-photothermal power generation system, which is used for establishing a method for calculating the power generation efficiency and the output power of the photovoltaic power generation system by utilizing the fact that the power generation efficiency increase value of a photovoltaic power generation plate is in direct proportion to the temperature decrease value of the power generation plate caused by air cooling; the method is characterized in that a calculation method for generating efficiency and output power of a photo-thermal power generation system is established by utilizing the direct proportion relation between the added value of the generating efficiency of the photo-thermal power generation system and the increased value of the air temperature of a closed space system for storing molten salt energy, the influence mechanism of the random characteristics, fuzzy characteristics, probability characteristics and fuzzy distribution rules of parameters such as sunlight intensity, sunlight time, sunlight shadow, sunlight deflection angle and the like on the output power of an air-cooled photovoltaic-photo-thermal power generation system is reflected, theoretical guidance is provided for the prediction of the generating output of the air-cooled photovoltaic-photo-thermal power generation system, necessary technical support is provided for distributed new energy power generation and intelligent power grid dispatching operation, and the problems that the uncertainty and the randomness of the influence factors are not considered comprehensively in the calculation method for the daily generated energy of the distributed photovoltaic power generation system of new, The practicability and the applicability are difficult to meet.
Referring to fig. 3, an output power calculation apparatus of an air-cooled photovoltaic-photothermal power generation system according to an embodiment of the present invention includes:
the first calculating module 201 is used for calculating a temperature reduction value of the solar photovoltaic power generation panel according to the obtained inlet cold air temperature, outlet hot air temperature and ambient temperature of the photovoltaic power generation cooling air system;
the second calculating module 202 is used for calculating a power generation efficiency increasing value of the photovoltaic power generation system according to the temperature decreasing value of the solar photovoltaic power generation panel;
the third calculating module 203 is used for calculating the effective sunlight intensity of the area where the air-cooled photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air-cooled photovoltaic-photothermal power generation system is located;
the fourth calculating module 204 is configured to calculate the generated power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
the fifth calculating module 205 is configured to calculate a power generation efficiency increase value of the photo-thermal power generation system according to the obtained temperature and the environmental temperature of the closed space system for storing molten salt energy;
a sixth calculating module 206, configured to calculate an amount of high-temperature and high-pressure steam available to the air-cooled photovoltaic-photothermal power generation system according to the effective sunlight intensity;
the seventh calculation module 207 is configured to calculate the generated power of the photo-thermal power generation system according to the high-temperature and high-pressure steam amount;
and an eighth calculating module 208, configured to calculate the output power of the air-cooled photovoltaic-photothermal power generation system according to the generated power of the photovoltaic power generation panel and the generated power of the photothermal power generation system.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An output power calculation method of an air-cooled photovoltaic-photothermal power generation system is characterized by comprising the following steps:
the air cooling photovoltaic-photothermal power generation system comprises a photovoltaic power generation system, a photothermal power generation system, a photovoltaic power generation cooling air system and a molten salt energy storage closed space system, wherein the photovoltaic power generation system comprises a solar photovoltaic power generation plate;
the method comprises the following steps: calculating a temperature reduction value of the solar photovoltaic power generation plate according to the acquired inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system;
calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel;
calculating the effective sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located;
calculating the power generation power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
calculating a power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the ambient temperature of the closed space system for storing the molten salt energy;
calculating the amount of high-temperature and high-pressure steam available for the air cooling photovoltaic-photothermal power generation system according to the effective sunlight intensity;
calculating the power generation power of the photo-thermal power generation system according to the high-temperature high-pressure steam quantity;
calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system;
wherein the content of the first and second substances,
the effective solar radiation intensity of the area where the air-cooled photovoltaic-photothermal power generation system is located is calculated according to the solar radiation intensity of the area where the air-cooled photovoltaic-photothermal power generation system is located, and the effective solar radiation intensity includes:
calculating the effective sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located through an effective sunshine intensity calculation formula according to the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, wherein the effective sunshine intensity calculation formula specifically comprises the following steps:
Eeff＝ηSTηSYηSAE(1-kTE)；
wherein E is the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, and the unit is W/m2；ηST、ηSY、ηSAThe influence coefficients of the sunshine time, the sunshine shadow and the sunshine deflection angle on the sunshine intensity are respectively; k is a radical ofTEK is an environmental influence coefficient of 0 or moreTE≤1；
The calculating the power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the acquired environmental temperature of the closed space system for storing the molten salt energy comprises the following steps:
according to the obtained temperature and the environment temperature of the closed space system for storing the molten salt energy, calculating the power generation efficiency increase value of the photo-thermal power generation system through a photo-thermal power generation efficiency increase value calculation formula, wherein the photo-thermal power generation efficiency increase value calculation formula specifically comprises the following steps:
ΔeCSP＝ηH(TH-TE)；
wherein, ηHThe coefficient of power generation effect, T, is formed by inputting high-temperature air from a photovoltaic thermal system into a closed space system for storing energy by fused saltHTemperature, T, of a closed space system for storing energy in molten saltsEIs ambient temperature.
2. The method for calculating the output power of the air-cooled photovoltaic-photothermal power generation system according to claim 1, wherein the calculating the temperature reduction value of the solar photovoltaic power generation panel according to the obtained inlet cold air temperature and outlet hot air temperature of the photovoltaic power generation cooling air system and the obtained ambient temperature comprises:
according to the obtained inlet cold air temperature, outlet hot air temperature and environment temperature of the photovoltaic power generation cooling air system, calculating a temperature reduction value of the solar photovoltaic power generation panel through a power generation panel temperature reduction value calculation formula, wherein the power generation panel temperature reduction value calculation formula specifically comprises the following steps:
wherein k iscoolResponse coefficient, T, of the value of temperature drop of the photovoltaic panel to the difference between the outlet and inlet water temperatures of the cooling water system of the photovoltaic panelEIs ambient temperature.
3. The air-cooled photovoltaic-thermal power generation system output power calculation method according to claim 2, wherein the calculating of the power generation efficiency increase value of the photovoltaic power generation system from the temperature decrease value of the solar photovoltaic panel includes:
calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel through a photovoltaic power generation efficiency increase value calculation formula, wherein the photovoltaic power generation efficiency increase value calculation formula specifically comprises the following steps:
ΔePV＝kA,coolΔTPV+kB,cool；
wherein k isA,cool、kB,coolThe power generation effect coefficients of air cooling of the air cooling photovoltaic thermal system are all the power generation effect coefficients.
4. The air-cooled photovoltaic-thermal power generation system output power calculation method according to claim 3, wherein the calculating the generated power of the photovoltaic power generation panel from the effective power generation area of the photovoltaic power generation panel includes:
calculating the generating power of the photovoltaic power generation panel through a generating panel generating power solving formula according to the effective generating area of the photovoltaic power generation panel, wherein the generating power solving formula of the generating panel is specifically as follows:
PPV＝pSTpSYpSA(1+ΔePV)APVkPVEEeff；
wherein A isPVFor air cooling the effective generating area of photovoltaic power generation board of photovoltaic thermal system, unit is m2；pST、pSY、pSAThe probability of the interval property of the sunshine time, the probability of the sunshine shadow and the probability of the sunshine deflection angle of the air cooling photovoltaic thermal system are respectively.
5. The air-cooled photovoltaic-thermal power generation system output power calculation method according to claim 4, wherein the calculating the amount of high-temperature and high-pressure steam available to the air-cooled photovoltaic-thermal power generation system from the effective solar radiation intensity includes:
calculating the available high-temperature high-pressure steam quantity of the air cooling photovoltaic-photo-thermal power generation system through a steam quantity solving formula according to the effective sunlight intensity, wherein the steam quantity solving formula specifically comprises the following steps:
wherein f isCSP2、fCSP1、fCSP0All the solar thermal power generation systems have the light efficiency coefficient of a heat collector with a certain volume.
6. The air-cooled photovoltaic-thermal power generation system output power calculation method according to claim 5, wherein the calculating the generated power of the thermal power generation system from the high-temperature and high-pressure steam amount includes:
calculating the generating power of the photo-thermal generating system through a photo-thermal generating power solving formula according to the high-temperature high-pressure steam quantity, wherein the photo-thermal generating power solving formula specifically comprises the following steps:
wherein, WCSPThe amount of high-temperature high-pressure hot air available for the photo-thermal power generation system of the air-cooled photovoltaic-photo-thermal power generation system is m3(ii) a a. b and c are power coefficients related to the amount of high-temperature and high-pressure hot air available for the photo-thermal power generation system of the air-cooled photovoltaic-photo-thermal power generation system respectively.
7. The air-cooled photovoltaic-thermal power generation system output power calculation method according to claim 6, wherein the calculating the output power of the air-cooled photovoltaic-thermal power generation system from the generated power of the photovoltaic power generation panel and the generated power of the thermal power generation system includes:
calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system through a system output power calculation formula, wherein the system output power calculation formula specifically comprises:
PPV-CSP＝ηDC/ACPPV+PCSPΔeCSP；
wherein, ηDC/ACThe conversion efficiency of the inverter of the photovoltaic power generation system is improved.
8. An air-cooled photovoltaic-photothermal power generation system output power calculation device, comprising:
the first calculation module is used for calculating a temperature reduction value of the solar photovoltaic power generation panel according to the acquired inlet cold air temperature, outlet hot air temperature and ambient temperature of the photovoltaic power generation cooling air system;
the second calculation module is used for calculating the power generation efficiency increase value of the photovoltaic power generation system according to the temperature decrease value of the solar photovoltaic power generation panel;
the third calculation module is used for calculating the effective sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located according to the sunlight intensity of the area where the air cooling photovoltaic-photothermal power generation system is located;
the fourth calculation module is used for calculating the power generation power of the photovoltaic power generation panel according to the effective power generation area of the photovoltaic power generation panel;
the fifth calculation module is used for calculating the power generation efficiency increase value of the photo-thermal power generation system according to the acquired temperature and the environmental temperature of the closed space system for storing the energy of the molten salt;
the sixth calculation module is used for calculating the amount of high-temperature and high-pressure steam available for the air cooling photovoltaic-photothermal power generation system according to the effective sunlight intensity;
the seventh calculation module is used for calculating the power generation power of the photo-thermal power generation system according to the high-temperature high-pressure steam quantity;
the eighth calculation module is used for calculating the output power of the air cooling photovoltaic-photothermal power generation system according to the power generation power of the photovoltaic power generation panel and the power generation power of the photothermal power generation system;
wherein the content of the first and second substances,
the third computing module is specifically configured to:
calculating the effective sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located through an effective sunshine intensity calculation formula according to the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, wherein the effective sunshine intensity calculation formula specifically comprises the following steps:
Eeff＝ηSTηSYηSAE(1-kTE)；
wherein E is the sunshine intensity of the area where the air cooling photovoltaic-photothermal power generation system is located, and the unit is W/m2；ηST、ηSY、ηSAThe influence coefficients of the sunshine time, the sunshine shadow and the sunshine deflection angle on the sunshine intensity are respectively; k is a radical ofTEK is an environmental influence coefficient of 0 or moreTE≤1；
The fifth calculation module is specifically configured to:
according to the obtained temperature and the environment temperature of the closed space system for storing the molten salt energy, calculating the power generation efficiency increase value of the photo-thermal power generation system through a photo-thermal power generation efficiency increase value calculation formula, wherein the photo-thermal power generation efficiency increase value calculation formula specifically comprises the following steps:
ΔeCSP＝ηH(TH-TE)；
wherein, ηHThe coefficient of power generation effect, T, is formed by inputting high-temperature air from a photovoltaic thermal system into a closed space system for storing energy by fused saltHTemperature, T, of a closed space system for storing energy in molten saltsEIs ambient temperature.
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