Method and device for optimizing photothermal and photovoltaic installed capacity

Abstract

The application relates to a method and device for optimizing photothermal and photovoltaic installed capacity, which comprises the following steps: obtaining a critical installed ratio of a photothermal power station and a photovoltaic power station in a photothermal-photovoltaic combined power generation system; inputting the critical installed ratio of the photothermal power station and the photovoltaic power station into a pre-established photothermal and photovoltaic installed capacity optimization model; solving the photothermal and photovoltaic installed capacity optimization model to obtain optimal installed capacity of the photothermal power station and optimal installed capacity of the photovoltaic power station in the photothermal-photovoltaic combined power generation system. The technical scheme provided by the application optimizes the optimal installed capacity of the photothermal power station and the photovoltaic power station, improves the safety and stability of power grid operation, increases new energy consumption, and reduces the light abandonment rate.

Description

Technical Field

[0001] This invention relates to the field of new energy power generation, specifically to a method and apparatus for optimizing the installed capacity of solar thermal and photovoltaic power generation. Background Technology

[0002] Due to the abundance of global solar energy resources and huge development potential, solar power plays an increasingly important role in ensuring global energy supply and promoting clean energy development. However, due to the inherent disadvantages of photovoltaic power generation, such as the random fluctuation of its output and poor resistance to disturbances, photovoltaic power plants have very weak support for the power grid. This is especially true in western regions, where the capacity of conventional units is relatively small and the system's frequency regulation and peak regulation capabilities are severely insufficient. Under the condition of weak synchronous support, the sending-end power grid is prone to safety and stability problems such as low-frequency oscillations.

[0003] Solar thermal power generation, a type of solar power generation, typically uses steam turbine generator sets, which can significantly smooth out power output and convert a portion of solar energy into thermal energy for storage. This thermal energy can then be used to generate electricity in the evening or when the power grid needs frequency regulation and peak shaving to meet grid requirements. Given the similarities in resource requirements and the distinct characteristics of technologies between photovoltaic (PV) and solar thermal power generation, how to optimize and coordinate PV and solar thermal power generation has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method and apparatus for optimizing the installed capacity of solar thermal and photovoltaic power generation, thereby increasing the absorption of new energy sources and reducing the curtailment rate.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] This invention provides a method for optimizing the installed capacity of solar thermal and photovoltaic power, the improvement of which is that the method includes:

[0007] Obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system;

[0008] The critical installed capacity ratio of solar thermal power plants and photovoltaic power plants is input into a pre-established solar thermal and photovoltaic installed capacity optimization model. The solar thermal and photovoltaic installed capacity optimization model is solved to obtain the optimal installed capacity of solar thermal power plants and the optimal installed capacity of photovoltaic power plants in the solar thermal-photovoltaic combined power generation system.

[0009] The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and satisfies the critical installed capacity ratio constraint of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system.

[0010] Preferably, obtaining the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system includes:

[0011] Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions;

[0012] Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio;

[0013] Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2.

[0014] The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

[0015] Furthermore, the extreme weather conditions include:

[0016] The solar irradiance decreases by more than or equal to 50% within 1 minute.

[0017] Preferably, the solar thermal and photovoltaic (CTP) installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic (PV) power plants and CTP power plants in the CTP-PV combined power generation system, and satisfies the critical installed capacity ratio constraint between CTP and PV power plants in the CTP-PV combined power generation system, including:

[0018] An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power.

[0019] The constraints are the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, the economic constraints, the DC channel operation constraints, and the power plant operation constraints.

[0020] Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

[0021] Furthermore, the objective function constructed with the goal of minimizing the total installed capacity of photovoltaic and solar thermal power plants in the solar thermal-photovoltaic combined power generation system and minimizing the total curtailed solar power includes:

[0022] The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0023]

[0024] In the above formula, F1 is the total installed capacity of photovoltaic power plants and solar thermal power plants, F2 is the total curtailed solar power of photovoltaic power plants and solar thermal power plants, and S pv For the installed capacity of photovoltaic power plants, S csp P represents the installed capacity of the concentrated solar power (CSP) plant, α is the correction factor for the installed capacity of the CSP plant, and P is the installed capacity of the CSP plant. pv,id (t) represents the theoretical output power of the photovoltaic power station during time period t, P csp,id (t) represents the theoretical output power of the solar thermal power plant during time period t, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T This represents the total number of time periods.

[0025] Furthermore, the constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes:

[0026] The critical installation ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installation capacity optimization model are determined by the following formula:

[0027] S csp / S pv ≥Ratio

[0028] In the above formula, S pv For the installed capacity of photovoltaic power plants, S csp Ratio represents the installed capacity of a solar thermal power plant, while Ratio represents the critical ratio of solar thermal power plants to photovoltaic power plants required for the safe and stable operation of a combined solar thermal and photovoltaic power generation system.

[0029] Furthermore, the use of economic constraints as a constraint condition includes...

[0030] The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0031] R pv ≥R pv,min

[0032] R csp ≥R csp,min

[0033]

[0034]

[0035] In the above formula, Rpv R represents the annual return on investment for a photovoltaic power plant. csp R represents the annual return on investment for a solar thermal power plant. pv,min R represents the lower limit of the annual return on investment for photovoltaic power plants. csp,min FIT is the lower limit of the annual return on investment for concentrated solar power (CSP) plants. pv For the feed-in tariff of photovoltaic power plants, FIT csp For the feed-in tariff of the solar thermal power plant, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T S represents the total number of time periods. pv For the installed capacity of photovoltaic power plants, S csp For the installed capacity of solar thermal power plants, C pv C represents the unit construction cost of a photovoltaic power station. csp For the unit construction cost of a solar thermal power plant, CMt pv CMt represents the percentage of annual operation and maintenance costs of a photovoltaic power plant to its total investment. csp This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

[0036] Furthermore, the constraint condition based on the DC channel operation includes:

[0037] The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0038] H dc =∑P dc (t) / S dc

[0039] H dc ≥H dc,min

[0040]

[0041] In the above formula, H dc P represents the actual utilization hours of the DC channel. dc (t) represents the DC power transmitted during time period t, S dc For the rated capacity of the DC channel, H dc,min T represents the minimum utilization hours for the DC channel. dc,min X is the minimum duration of constant power operation for the DC channel. dc (t) is the DC channel power transmission switching marker, X dc (t)∈(0,1),X dc (t) = 0, power remains constant, X dc (t) = 1 Power change.

[0042] Furthermore, the use of power plant operation constraints as constraint conditions includes:

[0043] The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0044] P g (t)+P pv (t)+P csp (t)-P l (t)-P dc (t)=0

[0045] The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model:

[0046] P g,min ≤P g (t)≤P g,max

[0047] The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0048] P pv,min ≤P pv (t)≤P pv,max

[0049] The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model:

[0050] P csp,min ≤P csp (t)≤P csp,max

[0051] The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0052] P csphc (t)≤P csphc,id (t)

[0053] P csphc (t)+P tes (t)-P csph (t)=0

[0054] The solar thermal power plant's heat storage and release capacity and power constraints are determined using the following formula for the solar thermal and photovoltaic installed capacity optimization model:

[0055] E tes (t)≤E tes,max

[0056] P tes,min ≤P tes (t)≤P tes,max

[0057] The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0058]

[0059]

[0060] r pv ≤r pv,max

[0061] r csp ≤r csp,max

[0062] In the above formula, P g (t) represents the output power of a conventional power plant during time period t, P l (t) represents the load of the solar thermal-photovoltaic combined power generation system during time period t, P dc (t) represents the DC power transmitted during time period t, P g,min For the minimum output power limit of conventional power plants, P g,max For the maximum output power limit of a conventional power plant, P pv,min P is the minimum output power limit for photovoltaic power plants. pv,max P is the maximum output power limit for photovoltaic power plants. csp,min For the minimum output power limit of a solar thermal power plant, P csp,max For the maximum output power limit of a solar thermal power plant, P csphc (t) represents the solar thermal power generation of the solar thermal power plant during time period t, P csphc,id (t) represents the theoretical solar thermal power generation of the solar thermal power plant during time period t, P csph (t) represents the thermal power output required by the solar thermal power plant during time period t, E tes (t) represents the thermal storage system capacity in the concentrated solar power generation during time period t, E tes,max P represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation. tes (t) represents the heat release power of the thermal storage system during time period t, P tes,max P represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). tes,min r is the lower limit of the heat release power of the thermal storage system in concentrated solar power generation. pv r represents the curtailment rate of solar power plants. csp r represents the curtailment rate of solar thermal power plants. pv,max r represents the upper limit of the allowable curtailment rate for photovoltaic power plants. csp,max N represents the upper limit of the allowable curtailment rate for a solar thermal power plant, Δt represents the duration of the time period, and N represents the total curtailment rate. T This represents the total number of time periods.

[0063] This invention provides an optimization device for solar thermal and photovoltaic installed capacity, the improvement of which is that the device includes:

[0064] The acquisition module is used to obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system;

[0065] The solution module is used to input the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant into the pre-established solar thermal and photovoltaic installed capacity optimization model, solve the solar thermal and photovoltaic installed capacity optimization model, and obtain the optimal installed capacity of the solar thermal power plant and the optimal installed capacity of the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system.

[0066] The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and satisfies the critical installed capacity ratio constraint of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system.

[0067] Preferably, the acquisition module is specifically used for:

[0068] Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions;

[0069] Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio;

[0070] Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2.

[0071] The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

[0072] Furthermore, the extreme weather conditions include:

[0073] The solar irradiance decreases by more than or equal to 50% within 1 minute.

[0074] Preferably, the solar thermal and photovoltaic (CTP) installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic (PV) power plants and CTP power plants in the CTP-PV combined power generation system, and satisfies the critical installed capacity ratio constraint between CTP and PV power plants in the CTP-PV combined power generation system, including:

[0075] An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power.

[0076] The constraints are the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, the economic constraints, the DC channel operation constraints, and the power plant operation constraints.

[0077] Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

[0078] Furthermore, the objective function constructed with the goal of minimizing the total installed capacity of photovoltaic and solar thermal power plants in the solar thermal-photovoltaic combined power generation system and minimizing the total curtailed solar power includes:

[0079] The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0080]

[0081] In the above formula, F1 is the total installed capacity of photovoltaic power plants and solar thermal power plants, F2 is the total curtailed solar power of photovoltaic power plants and solar thermal power plants, and S pv For the installed capacity of photovoltaic power plants, S csp P represents the installed capacity of the concentrated solar power (CSP) plant, α is the correction factor for the installed capacity of the CSP plant, and P is the installed capacity of the CSP plant. pv,id (t) represents the theoretical output power of the photovoltaic power station during time period t, P csp,id (t) represents the theoretical output power of the solar thermal power plant during time period t, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T This represents the total number of time periods.

[0082] Furthermore, the constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes:

[0083] The critical installation ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installation capacity optimization model are determined by the following formula:

[0084] S csp / S pv ≥Ratio

[0085] In the above formula, S pv For the installed capacity of photovoltaic power plants, S csp Ratio represents the installed capacity of a solar thermal power plant, while Ratio represents the critical ratio of solar thermal power plants to photovoltaic power plants required for the safe and stable operation of a combined solar thermal and photovoltaic power generation system.

[0086] Furthermore, the use of economic constraints as a constraint condition includes...

[0087] The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0088] R pv ≥R pv,min

[0089] R csp ≥R csp,min

[0090]

[0091]

[0092] In the above formula, R pv R represents the annual return on investment for a photovoltaic power plant. csp R represents the annual return on investment for a solar thermal power plant. pv,min R represents the lower limit of the annual return on investment for photovoltaic power plants. csp,min FIT is the lower limit of the annual return on investment for concentrated solar power (CSP) plants. pv For the feed-in tariff of photovoltaic power plants, FIT csp For the feed-in tariff of the solar thermal power plant, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T S represents the total number of time periods. pv For the installed capacity of photovoltaic power plants, S csp For the installed capacity of solar thermal power plants, C pv C represents the unit construction cost of a photovoltaic power station. csp For the unit construction cost of a solar thermal power plant, CMt pv CMt represents the percentage of annual operation and maintenance costs of a photovoltaic power plant to its total investment. csp This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

[0093] Furthermore, the constraint condition based on the DC channel operation includes:

[0094] The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0095] H dc =∑P dc (t) / S dc

[0096] H dc ≥H dc,min

[0097]

[0098] In the above formula, H dc P represents the actual utilization hours of the DC channel. dc (t) represents the DC power transmitted during time period t, S dc For the rated capacity of the DC channel, H dc,min T represents the minimum utilization hours for the DC channel. dc,min X is the minimum duration of constant power operation for the DC channel. dc (t) is the DC channel power transmission switching marker, X dc (t)∈(0,1),X dc (t) = 0, power remains constant, X dc (t) = 1 Power change.

[0099] Furthermore, the use of power plant operation constraints as constraint conditions includes:

[0100] The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0101] P g (t)+P pv (t)+P csp (t)-P l (t)-P dc (t)=0

[0102] The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model:

[0103] P g,min ≤P g (t)≤P g,max

[0104] The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0105] P pv,min ≤P pv (t)≤P pv,max

[0106] The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model:

[0107] P csp,min ≤P csp (t)≤P csp,max

[0108] The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0109] Pcsphc (t)≤P csphc,id (t)

[0110] P csphc (t)+P tes (t)-P csph (t)=0

[0111] The solar thermal power plant's heat storage and release capacity and power constraints are determined using the following formula for the solar thermal and photovoltaic installed capacity optimization model:

[0112] E tes (t)≤E tes,max

[0113] P tes,min ≤P tes (t)≤P tes,max

[0114] The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0115]

[0116]

[0117] r pv ≤r pv,max

[0118] r csp ≤r csp,max

[0119] In the above formula, P g (t) represents the output power of a conventional power plant during time period t, P l (t) represents the load of the solar thermal-photovoltaic combined power generation system during time period t, P dc (t) represents the DC power transmitted during time period t, P g,min For the minimum output power limit of conventional power plants, P g,max For the maximum output power limit of a conventional power plant, P pv,min P is the minimum output power limit for photovoltaic power plants. pv,max P is the maximum output power limit for photovoltaic power plants. csp,min For the minimum output power limit of a solar thermal power plant, P csp,max For the maximum output power limit of a solar thermal power plant, P csphc (t) represents the solar thermal power generation of the solar thermal power plant during time period t, P csphc,id (t) represents the theoretical solar thermal power generation of the solar thermal power plant during time period t, P csph (t) represents the thermal power output required by the solar thermal power plant during time period t, E tes (t) represents the thermal storage system capacity in the concentrated solar power generation during time period t, E tes,max P represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation.tes (t) represents the heat release power of the thermal storage system during time period t, P tes,max P represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). tes,min r is the lower limit of the heat release power of the thermal storage system in concentrated solar power generation. pv r represents the curtailment rate of solar power plants. csp r represents the curtailment rate of solar thermal power plants. pv,max r represents the upper limit of the allowable curtailment rate for photovoltaic power plants. csp,max N represents the upper limit of the allowable curtailment rate for a solar thermal power plant, Δt represents the duration of the time period, and N represents the total curtailment rate. T This represents the total number of time periods.

[0120] Compared with the closest existing technology, the present invention has the following advantages:

[0121] This invention provides a method and apparatus for optimizing the installed capacity of solar thermal and photovoltaic (CSP) power plants. The method obtains the critical installed capacity ratio of CSP and photovoltaic power plants in a CSP-PV combined power generation system. This critical ratio is then input into a pre-established CSP and PV installed capacity optimization model. The model is solved to obtain the optimal installed capacity of both the CSP and PV power plants in the combined CSP-PV system. This invention provides a comprehensive optimization of CSP and PV power generation in solar power generation, ensuring the security of DC transmission channels while increasing the absorption of new energy sources and reducing curtailment rates. Attached Figure Description

[0122] Figure 1 This is a flowchart of a method for optimizing the installed capacity of solar thermal and photovoltaic systems provided by the present invention;

[0123] Figure 2 This is a frequency response characteristic diagram of the solar thermal-photovoltaic combined power generation system provided by the present invention under extreme weather conditions;

[0124] Figure 3 This is an operational curve diagram of the solar thermal-photovoltaic combined power generation system provided by the present invention;

[0125] Figure 4 This is an operational curve diagram of the DC power transmission channel provided by the present invention;

[0126] Figure 5 This is a structural diagram of an optimization device for solar thermal and photovoltaic installed capacity provided by the present invention. Detailed Implementation

[0127] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0128] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0129] This invention provides a method for optimizing the installed capacity of solar thermal and photovoltaic power, such as... Figure 1 As shown, the method includes:

[0130] Obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system;

[0131] The critical installed capacity ratio of solar thermal power plants and photovoltaic power plants is input into a pre-established solar thermal and photovoltaic installed capacity optimization model. The solar thermal and photovoltaic installed capacity optimization model is solved to obtain the optimal installed capacity of solar thermal power plants and the optimal installed capacity of photovoltaic power plants in the solar thermal-photovoltaic combined power generation system.

[0132] The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and satisfies the critical installed capacity ratio constraint of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system.

[0133] In the preferred embodiment of the present invention, obtaining the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system includes:

[0134] Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions;

[0135] Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio;

[0136] Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2.

[0137] The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

[0138] In the preferred embodiment of the present invention, such as Figure 2 As shown, the frequency response characteristics are shown under extreme weather conditions and preset installed capacity ratios of 2 / 8, 4 / 6, 5 / 5, 6 / 4 and 8 / 2. If the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system is greater than or equal to 49.5Hz, then 4 / 6 is taken as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system.

[0139] Specifically, the extreme weather conditions include:

[0140] The solar irradiance decreases by more than or equal to 50% within 1 minute.

[0141] In the preferred embodiment of the present invention, the solar thermal and photovoltaic installed capacity optimization model is established based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and satisfying the critical installed capacity ratio constraint between solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, including:

[0142] An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power.

[0143] The constraints are the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, the economic constraints, the DC channel operation constraints, and the power plant operation constraints.

[0144] Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

[0145] The objective function, which aims to minimize the total installed capacity of photovoltaic (PV) and solar thermal (CSP) power plants and the total amount of curtailed solar power in the CSP-PV combined power generation system, includes:

[0146] The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0147]

[0148] In the above formula, F1 is the total installed capacity of photovoltaic power plants and solar thermal power plants, F2 is the total curtailed solar power of photovoltaic power plants and solar thermal power plants, and S pv For the installed capacity of photovoltaic power plants, S csp P represents the installed capacity of the concentrated solar power (CSP) plant, α is the correction factor for the installed capacity of the CSP plant, and P is the installed capacity of the CSP plant. pv,id (t) represents the theoretical output power of the photovoltaic power station during time period t, P csp,id (t) represents the theoretical output power of the solar thermal power plant during time period t, P pv(t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T This represents the total number of time periods.

[0149] The constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes:

[0150] The critical installation ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installation capacity optimization model are determined by the following formula:

[0151] S csp / S pv ≥Ratio

[0152] In the above formula, S pv For the installed capacity of photovoltaic power plants, S csp Ratio represents the installed capacity of a solar thermal power plant, while Ratio represents the critical ratio of solar thermal power plants to photovoltaic power plants required for the safe and stable operation of a combined solar thermal and photovoltaic power generation system.

[0153] The use of economic constraints as a constraint condition includes

[0154] The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0155] R pv ≥R pv,min

[0156] R csp ≥R csp,min

[0157]

[0158]

[0159] In the above formula, R pv R represents the annual return on investment for a photovoltaic power plant. csp R represents the annual return on investment for a solar thermal power plant. pv,min R represents the lower limit of the annual return on investment for photovoltaic power plants. csp,min FIT is the lower limit of the annual return on investment for concentrated solar power (CSP) plants. pv For the feed-in tariff of photovoltaic power plants, FIT csp For the feed-in tariff of the solar thermal power plant, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T S represents the total number of time periods. pv For the installed capacity of photovoltaic power plants, Scsp For the installed capacity of solar thermal power plants, C pv C represents the unit construction cost of a photovoltaic power station. csp For the unit construction cost of a solar thermal power plant, CMt pv CMt represents the percentage of annual operation and maintenance costs of a photovoltaic power plant to its total investment. csp This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

[0160] The use of security constraints as constraints includes:

[0161] The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0162] H dc =∑P dc (t) / S dc

[0163] H dc ≥H dc,min

[0164]

[0165] In the above formula, H dc P represents the actual utilization hours of the DC channel. dc (t) represents the DC power transmitted during time period t, S dc For the rated capacity of the DC channel, H dc,min T represents the minimum utilization hours for the DC channel. dc,min X is the minimum duration of constant power operation for the DC channel. dc (t) is the DC channel power transmission switching marker, X dc (t)∈(0,1),X dc (t) = 0, power remains constant, X dc (t) = 1 Power change.

[0166] The constraint condition of maximizing absorption includes:

[0167] The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0168] P g (t)+P pv (t)+P csp (t)-P l (t)-P dc (t)=0

[0169] The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model:

[0170] P g,min≤P g (t)≤P g,max

[0171] The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0172] P pv,min ≤P pv (t)≤P pv,max

[0173] The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model:

[0174] P csp,min ≤P csp (t)≤P csp,max

[0175] The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0176] P csphc (t)≤P csphc,id (t)

[0177] P csphc (t)+P tes (t)-P csph (t)=0

[0178] The solar thermal power plant's heat storage and release capacity and power constraints are determined using the following formula for the solar thermal and photovoltaic installed capacity optimization model:

[0179] E tes (t)≤E tes,max

[0180] P tes,min ≤P tes (t)≤P tes,max

[0181] The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0182]

[0183]

[0184] r pv ≤r pv,max

[0185] r csp ≤r csp,max

[0186] In the above formula, P g (t) represents the output power of a conventional power plant during time period t, Pl (t) represents the load of the solar thermal-photovoltaic combined power generation system during time period t, P dc (t) represents the DC power transmitted during time period t, P g,min For the minimum output power limit of conventional power plants, P g,max For the maximum output power limit of a conventional power plant, P pv,min P is the minimum output power limit for photovoltaic power plants. pv,max P is the maximum output power limit for photovoltaic power plants. csp,min For the minimum output power limit of a solar thermal power plant, P csp,max For the maximum output power limit of a solar thermal power plant, P csphc (t) represents the solar thermal power generation of the solar thermal power plant during time period t, P csphc,id (t) represents the theoretical solar thermal power generation of the solar thermal power plant during time period t, P csph (t) represents the thermal power output required by the solar thermal power plant during time period t, E tes (t) represents the thermal storage system capacity in the concentrated solar power generation during time period t, E tes,max P represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation. tes (t) represents the heat release power of the thermal storage system during time period t, P tes,max P represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). tes,min r is the lower limit of the heat release power of the thermal storage system in concentrated solar power generation. pv r represents the curtailment rate of solar power plants. csp r represents the curtailment rate of solar thermal power plants. pv,max r represents the upper limit of the allowable curtailment rate for photovoltaic power plants. csp,max N represents the upper limit of the allowable curtailment rate for a solar thermal power plant, Δt represents the duration of the time period, and N represents the total curtailment rate. T This represents the total number of time periods.

[0187] In the preferred embodiment of the present invention, such as Figure 3 As shown, under the optimization model planning of solar thermal and photovoltaic installed capacity, it can be concluded that photovoltaic power plants mainly generate electricity during the day, reducing the curtailment rate; solar thermal power plants generate electricity at night and during periods when photovoltaic power plants are underpowered through heat storage.

[0188] In the preferred embodiment of the present invention, such as Figure 4 As shown in the figure, the operation curve of the DC transmission channel under the optimization of solar thermal and photovoltaic installed capacity shows that the DC channel operates smoothly and the minimum duration of constant power operation is greater than 8 hours.

[0189] This invention provides an optimization device for solar thermal and photovoltaic installed capacity, such as... Figure 5 As shown, the device includes:

[0190] The acquisition module is used to obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system;

[0191] The solution module is used to input the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant into the pre-established solar thermal and photovoltaic installed capacity optimization model, solve the solar thermal and photovoltaic installed capacity optimization model, and obtain the optimal installed capacity of the solar thermal power plant and the optimal installed capacity of the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system.

[0192] The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and ensuring that the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system meets the critical installed capacity ratio constraint.

[0193] In the preferred embodiment of the present invention, the acquisition module is specifically used for:

[0194] Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions;

[0195] Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio;

[0196] Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2.

[0197] The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

[0198] Specifically, the extreme weather conditions include:

[0199] The solar irradiance decreases by more than or equal to 50% within 1 minute.

[0200] In the preferred embodiment of the present invention, the solar thermal and photovoltaic installed capacity optimization model is established based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and satisfying the critical installed capacity ratio constraint between solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, including:

[0201] An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power.

[0202] The constraints are the critical installed capacity ratio, economic constraints, safety constraints, and maximum absorption constraints of the solar thermal power plant and the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system.

[0203] Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

[0204] The objective function, which aims to minimize the total installed capacity of photovoltaic (PV) and solar thermal (CSP) power plants and the total amount of curtailed solar power in the CSP-PV combined power generation system, includes:

[0205] The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0206]

[0207] In the above formula, F1 is the total installed capacity of photovoltaic power plants and solar thermal power plants, F2 is the total curtailed solar power of photovoltaic power plants and solar thermal power plants, and S pv For the installed capacity of photovoltaic power plants, S csp P represents the installed capacity of the concentrated solar power (CSP) plant, α is the correction factor for the installed capacity of the CSP plant, and P is the installed capacity of the CSP plant. pv,id (t) represents the theoretical output power of the photovoltaic power station during time period t, P csp,id (t) represents the theoretical output power of the solar thermal power plant during time period t, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T This represents the total number of time periods.

[0208] The constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes:

[0209] The critical installation ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installation capacity optimization model are determined by the following formula:

[0210] S csp / S pv ≥Ratio

[0211] In the above formula, S pv For the installed capacity of photovoltaic power plants, S csp Ratio represents the installed capacity of a solar thermal power plant, while Ratio represents the critical ratio of solar thermal power plants to photovoltaic power plants required for the safe and stable operation of a combined solar thermal and photovoltaic power generation system.

[0212] The use of economic constraints as a constraint condition includes

[0213] The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0214] R pv ≥R pv,min

[0215] R csp ≥R csp,min

[0216]

[0217]

[0218] In the above formula, R pv R represents the annual return on investment for a photovoltaic power plant. csp R represents the annual return on investment for a solar thermal power plant. pv,min R represents the lower limit of the annual return on investment for photovoltaic power plants. csp,min FIT is the lower limit of the annual return on investment for concentrated solar power (CSP) plants. pv For the feed-in tariff of photovoltaic power plants, FIT csp For the feed-in tariff of the solar thermal power plant, P pv (t) represents the actual output power of the photovoltaic power station during time period t, P csp (t) represents the actual output power of the solar thermal power plant during time period t, Δt represents the duration of the time period, and N T S represents the total number of time periods. pv For the installed capacity of photovoltaic power plants, S csp For the installed capacity of solar thermal power plants, C pv C represents the unit construction cost of a photovoltaic power station. csp For the unit construction cost of a solar thermal power plant, CMt pv CMt represents the percentage of annual operation and maintenance costs of a photovoltaic power plant to its total investment. csp This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

[0219] The constraint condition based on DC channel operation includes:

[0220] The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0221] H dc =∑P dc (t) / S dc

[0222] H dc ≥H dc,min

[0223]

[0224] In the above formula, H dcP represents the actual utilization hours of the DC channel. dc (t) represents the DC power transmitted during time period t, S dc For the rated capacity of the DC channel, H dc,min T represents the minimum utilization hours for the DC channel. dc,min X is the minimum duration of constant power operation for the DC channel. dc (t) is the DC channel power transmission switching marker, X dc (t)∈(0,1),X dc (t) = 0, power remains constant, X dc (t) = 1 Power change.

[0225] The use of power plant operation constraints as constraints includes:

[0226] The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula:

[0227] P g (t)+P pv (t)+P csp (t)-P l (t)-P dc (t)=0

[0228] The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model:

[0229] P g,min ≤P g (t)≤P g,max

[0230] The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula:

[0231] P pv,min ≤P pv (t)≤P pv,max

[0232] The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model:

[0233] P csp,min ≤P csp (t)≤P csp,max

[0234] The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0235] P csphc (t)≤P csphc,id (t)

[0236] P csphc(t)+P tes (t)-P csph (t)=0

[0237] The solar thermal power plant's heat storage and release capacity and power constraints are determined using the following formula for the solar thermal and photovoltaic installed capacity optimization model:

[0238] E tes (t)≤E tes,max

[0239] P tes,min ≤P tes (t)≤P tes,max

[0240] The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula:

[0241]

[0242]

[0243] r pv ≤r pv,max

[0244] r csp ≤r csp,max

[0245] In the above formula, P g (t) represents the output power of a conventional power plant during time period t, P l (t) represents the load of the solar thermal-photovoltaic combined power generation system during time period t, P dc (t) represents the DC power transmitted during time period t, P g,min For the minimum output power limit of conventional power plants, P g,max For the maximum output power limit of a conventional power plant, P pv,min P is the minimum output power limit for photovoltaic power plants. pv,max P is the maximum output power limit for photovoltaic power plants. csp,min For the minimum output power limit of a solar thermal power plant, P csp,max For the maximum output power limit of a solar thermal power plant, P csphc (t) represents the solar thermal power generation of the solar thermal power plant during time period t, P csphc,id (t) represents the theoretical solar thermal power generation of the solar thermal power plant during time period t, P csph (t) represents the thermal power output required by the solar thermal power plant during time period t, E tes (t) represents the thermal storage system capacity in the concentrated solar power generation during time period t, E tes,max P represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation. tes (t) represents the heat release power of the thermal storage system during time period t, P tes,max P represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). tes,minr is the lower limit of the heat release power of the thermal storage system in concentrated solar power generation. pv r represents the curtailment rate of solar power plants. csp r represents the curtailment rate of solar thermal power plants. pv,max r represents the upper limit of the allowable curtailment rate for photovoltaic power plants. csp,max N represents the upper limit of the allowable curtailment rate for a solar thermal power plant, Δt represents the duration of the time period, and N represents the total curtailment rate. T This represents the total number of time periods.

[0246] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0247] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0248] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0249] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0250] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for optimizing the installed capacity of solar thermal and photovoltaic power, characterized in that, The method includes: Obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system; The critical installed capacity ratio of solar thermal power plants and photovoltaic power plants is input into a pre-established solar thermal and photovoltaic installed capacity optimization model. The solar thermal and photovoltaic installed capacity optimization model is solved to obtain the optimal installed capacity of solar thermal power plants and the optimal installed capacity of photovoltaic power plants in the solar thermal-photovoltaic combined power generation system. The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and is established to meet the critical installed capacity ratio constraint of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system. The acquisition of the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system includes: Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions; Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio; Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2. The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

2. The method as described in claim 1, characterized in that, The extreme weather conditions include: The solar irradiance decreases by more than or equal to 50% within 1 minute.

3. The method as described in claim 1, characterized in that, The solar thermal and photovoltaic (CTP) installed capacity optimization model is established based on minimizing the total installed capacity and total curtailed solar power of photovoltaic (PV) and solar thermal power plants in the CTP-PV combined power generation system, and satisfying the critical installed capacity ratio constraint between CTP and PV power plants in the CTP-PV combined power generation system. It includes: An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power. The constraints are the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, the economic constraints, the DC channel operation constraints, and the power plant operation constraints. Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

4. The method as described in claim 3, characterized in that, The objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic (PV) and solar thermal (CSP) power plants and minimizing the total curtailed solar power in the CSP-PV combined power generation system. This includes: The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: In the above formula, This refers to the total installed capacity of photovoltaic power plants and solar thermal power plants. This represents the total amount of curtailed solar power from photovoltaic and solar thermal power plants. For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, This is the correction factor for the installed capacity of a solar thermal power plant. for t The theoretical output power of a photovoltaic power station during a given period. for t The theoretical output power of a solar thermal power plant during a specific time period. for t The actual output power of the photovoltaic power station during the period. for t The actual output power of the solar thermal power plant during the time period The duration of the time period. This represents the total number of time periods.

5. The method as described in claim 3, characterized in that, The constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes: The critical installed capacity ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installed capacity optimization model are determined by the following formula: In the above formula, For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, The critical installed capacity ratio of solar thermal power plants and photovoltaic power plants required for the safe and stable operation of a solar thermal-photovoltaic combined power generation system.

6. The method as described in claim 3, characterized in that, The use of economic constraints as a constraint condition includes The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula: In the above formula, The annual return on investment for a photovoltaic power plant. The annual return on investment for a solar thermal power plant, This represents the lower limit of the annual return on investment for photovoltaic power plants. This represents the lower limit of the annual return on investment for a solar thermal power plant. The feed-in tariff for photovoltaic power plants, The feed-in tariff for solar thermal power plants. for t The actual output power of the photovoltaic power station during the period. for t The actual output power of the solar thermal power plant during the time period The duration of the time period. Total number of time periods For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, The unit construction cost of a photovoltaic power station The unit construction cost of a solar thermal power plant The percentage of annual operation and maintenance costs of a photovoltaic power plant relative to its total investment. This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

7. The method as described in claim 3, characterized in that, The constraint condition based on DC channel operation includes: The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula: In the above formula, This represents the actual utilization hours of the DC channel. for t DC power transmission during specific time periods This refers to the rated capacity of the DC channel. This represents the minimum utilization hours for the DC channel. Minimum duration for constant power operation of the DC channel. This is a marker for switching the power output from the DC channel. , Power remains constant. Power variation.

8. The method as described in claim 3, characterized in that, The use of power plant operation constraints as constraints includes: The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula: The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model: The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula: The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model: The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: The following formula is used to determine the thermal power plant's heat storage and release capacity and power constraints in the optimization model of solar thermal and photovoltaic installed capacity: The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: In the above formula, for t The output power of a conventional power plant during the period for t The load of the solar thermal-photovoltaic combined power generation system during certain periods for t DC power transmission during specific time periods This is the minimum output power limit for conventional power plants. This is the maximum output power limit for conventional power plants. This is the minimum output power limit for photovoltaic power plants. This is the maximum output power limit for photovoltaic power plants. This is the minimum output power limit for a solar thermal power plant. The maximum output power limit for solar thermal power plants. for t Solar thermal power plant heat collection capacity during specific time periods for t Theoretical heat collection power of a solar thermal power plant during a specific time period for t The required thermal power output of a solar thermal power plant during a given period. for t The capacity of thermal storage systems in concentrated solar power generation during specific time periods. This represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation. for t Heat release power of the time-limited thermal storage system This represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). This represents the lower limit of the heat release power of the thermal storage system in concentrated solar power (CSP) generation. The curtailment rate of solar power plants The curtailment rate of solar thermal power plants This represents the upper limit of the allowable curtailment rate for photovoltaic power plants. This represents the upper limit of the allowable curtailment rate for concentrated solar power (CSP) plants. The duration of the time period. This represents the total number of time periods.

9. An optimization device for solar thermal and photovoltaic installed capacity, characterized in that, The device includes: The acquisition module is used to obtain the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system; The solution module is used to input the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant into the pre-established solar thermal and photovoltaic installed capacity optimization model, solve the solar thermal and photovoltaic installed capacity optimization model, and obtain the optimal installed capacity of the solar thermal power plant and the optimal installed capacity of the photovoltaic power plant in the solar thermal-photovoltaic combined power generation system. The solar thermal and photovoltaic installed capacity optimization model is based on minimizing the total installed capacity and total curtailed solar power of photovoltaic power plants and solar thermal power plants in the solar thermal-photovoltaic combined power generation system, and is established to meet the critical installed capacity ratio constraint of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system. The acquisition module is specifically used for: Step 1. Construct a simulation system for a solar thermal-photovoltaic combined power generation system under DC blocking and extreme weather conditions; Step 2. Select the preset installed capacity ratio without replacement from the preset installed capacity ratio set, and adjust the installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the simulation system of the solar thermal-photovoltaic combined power generation system to the preset installed capacity ratio; Step 3. Collect the frequency output of the solar thermal-photovoltaic combined power generation system in the simulation system. If the frequency is greater than or equal to 49.5Hz, then use the preset installed capacity ratio as the critical installed capacity ratio of the solar thermal power plant and the photovoltaic power plant in the solar thermal and photovoltaic combined power generation system. Otherwise, return to step 2. The preset installation ratio set includes preset installation ratios of 1 / 9, 2 / 8, 3 / 7, 4 / 6, 5 / 5, 6 / 4, 7 / 3 and 8 / 2.

10. The apparatus as claimed in claim 9, characterized in that, The extreme weather conditions include: The solar irradiance decreases by more than or equal to 50% within 1 minute.

11. The apparatus as claimed in claim 9, characterized in that, The solar thermal and photovoltaic (CTP) installed capacity optimization model is established based on minimizing the total installed capacity and total curtailed solar power of photovoltaic (PV) and solar thermal power plants in the CTP-PV combined power generation system, and satisfying the critical installed capacity ratio constraint between CTP and PV power plants in the CTP-PV combined power generation system. It includes: An objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic power plants and solar thermal power plants in a solar thermal-photovoltaic combined power generation system, as well as minimizing the total amount of curtailed solar power. The constraints are the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in the solar thermal-photovoltaic combined power generation system, the economic constraints, the DC channel operation constraints, and the power plant operation constraints. Based on the objective function and constraints, an optimization model for solar thermal and photovoltaic installed capacity is established.

12. The apparatus as claimed in claim 11, characterized in that, The objective function is constructed with the goal of minimizing the total installed capacity of photovoltaic (PV) and solar thermal (CSP) power plants and minimizing the total curtailed solar power in the CSP-PV combined power generation system. This includes: The objective function of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: In the above formula, This refers to the total installed capacity of photovoltaic power plants and solar thermal power plants. This represents the total amount of curtailed solar power from photovoltaic and solar thermal power plants. For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, This is the correction factor for the installed capacity of a solar thermal power plant. for t The theoretical output power of a photovoltaic power station during a given period. for t The theoretical output power of a solar thermal power plant during a specific time period. for t The actual output power of the photovoltaic power station during the period. for t The actual output power of the solar thermal power plant during the time period The duration of the time period. This represents the total number of time periods.

13. The apparatus as claimed in claim 11, characterized in that, The constraint condition, which uses the critical installed capacity ratio of solar thermal power plants and photovoltaic power plants in a solar thermal-photovoltaic combined power generation system, includes: The critical installed capacity ratio constraints for solar thermal and photovoltaic (CTP) in the CTP and photovoltaic installed capacity optimization model are determined by the following formula: In the above formula, For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, The critical installed capacity ratio of solar thermal power plants and photovoltaic power plants required for the safe and stable operation of a solar thermal-photovoltaic combined power generation system.

14. The apparatus as claimed in claim 11, characterized in that, The use of economic constraints as a constraint condition includes The economic constraints for the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula: In the above formula, The annual return on investment for a photovoltaic power plant. The annual return on investment for a solar thermal power plant, This represents the lower limit of the annual return on investment for photovoltaic power plants. This represents the lower limit of the annual return on investment for a solar thermal power plant. The feed-in tariff for photovoltaic power plants, The feed-in tariff for solar thermal power plants. for t The actual output power of the photovoltaic power station during the period. for t The actual output power of the solar thermal power plant during the time period The duration of the time period. Total number of time periods For the installed capacity of photovoltaic power plants, For the installed capacity of solar thermal power plants, The unit construction cost of a photovoltaic power station The unit construction cost of a solar thermal power plant The percentage of annual operation and maintenance costs of a photovoltaic power plant relative to its total investment. This represents the percentage of annual operation and maintenance costs of a solar thermal power plant relative to the total investment.

15. The apparatus as claimed in claim 11, characterized in that, The constraint condition based on DC channel operation includes: The DC channel operating constraints of the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula: In the above formula, This represents the actual utilization hours of the DC channel. for t DC power transmission during specific time periods This refers to the rated capacity of the DC channel. This represents the minimum utilization hours for the DC channel. Minimum duration for constant power operation of the DC channel. This is a marker for switching the power output from the DC channel. , Power remains constant. Power variation.

16. The apparatus as claimed in claim 11, characterized in that, The use of power plant operation constraints as constraints includes: The power balance constraints of the solar thermal and photovoltaic installed capacity optimization models are determined by the following formula: The following formula is used to determine the conventional power plant output power range constraints for the solar thermal and photovoltaic installed capacity optimization model: The output power range constraints of the photovoltaic power plant in the solar thermal and photovoltaic installed capacity optimization model are determined by the following formula: The following formula is used to determine the output power range constraints of the solar thermal power plant in the solar thermal and photovoltaic installed capacity optimization model: The solar thermal power collector power constraint of the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: The following formula is used to determine the thermal power plant's heat storage and release capacity and power constraints in the optimization model of solar thermal and photovoltaic installed capacity: The curtailment rate constraint for the solar thermal and photovoltaic installed capacity optimization model is determined by the following formula: In the above formula, for t The output power of a conventional power plant during the period for t The load of the solar thermal-photovoltaic combined power generation system during certain periods for t DC power transmission during specific time periods This is the minimum output power limit for conventional power plants. This is the maximum output power limit for conventional power plants. This is the minimum output power limit for photovoltaic power plants. This is the maximum output power limit for photovoltaic power plants. This is the minimum output power limit for a solar thermal power plant. The maximum output power limit for solar thermal power plants. for t Solar thermal power plant heat collection capacity during specific time periods for t Theoretical heat collection power of a solar thermal power plant during a specific time period for t The required thermal power output of a solar thermal power plant during a given period. for t The capacity of thermal storage systems in concentrated solar power generation during specific time periods. This represents the upper limit of the thermal storage system capacity in concentrated solar power (CSP) generation. for t Heat release power of the time-limited thermal storage system This represents the upper limit of the heat release power of the thermal storage system in concentrated solar power (CSP). This represents the lower limit of the heat release power of the thermal storage system in concentrated solar power (CSP) generation. The curtailment rate of solar power plants The curtailment rate of solar thermal power plants This represents the upper limit of the allowable curtailment rate for photovoltaic power plants. This represents the upper limit of the allowable curtailment rate for concentrated solar power (CSP) plants. The duration of the time period. This represents the total number of time periods.

Images