A control method and device for a light-fire complementary power generation system

Abstract

The present invention provides a control method and device for a light-fire complementary power generation system. The method comprises: obtaining initial operation data and preset constraints of the light-fire complementary power generation system; determining the heat release time under the maximum regulation load according to the initial operation data of the light-fire complementary power generation system; determining the peak-shaving electric energy of the light-fire complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the light-fire complementary power generation system; determining a first control parameter according to the peak-shaving electric energy of the light-fire complementary power generation system and the initial operation data of the light-fire complementary power generation system; determining a second control parameter according to the initial operation data of the light-fire complementary power generation system, the preset constraints and the preset evaluation model; and controlling the light-fire complementary power generation system to operate according to the first control parameter and the second control parameter. The present invention has the advantages of improving system operation efficiency and reducing system operation costs.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and also to a control method and device for a light-fire complementary power generation system. Background Art

[0002] The solar and coal-fired complementary power generation system has higher solar energy conversion efficiency and lower power generation costs, but simply combining the solar thermal collection system with the thermal power generation system will introduce the volatility of solar energy, which can neither reduce the impact of light disturbances nor ensure the continuous supply of solar heat to the complementary power generation system. If the coal-fired power generation system has less coupled light and heat, it cannot effectively reduce the carbon emissions of the unit. In addition, due to the intermittent nature of solar energy, the boiler will start and stop frequently, which will aggravate the life loss of low-cycle fatigue. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a control method and device for a solar-thermal complementary power generation system to improve the operating efficiency of the solar-thermal complementary power generation system.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0005] The first aspect of the present invention provides a control method for a solar-thermal complementary power generation system, comprising:

[0006] Obtain the initial operating data and preset constraints of the solar-thermal complementary power generation system;

[0007] Determining the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system;

[0008] Determine the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system;

[0009] Determine a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system;

[0010] Determining a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model;

[0011] The solar-thermal complementary power generation system is controlled to operate according to the first control parameter and the second control parameter.

[0012] Optionally, obtain initial operation data of the solar-thermal complementary power generation system, including:

[0013] Obtain the initial operation data to be processed of the solar-thermal complementary power generation system;

[0014] Screening the to-be-processed initial operation data of the solar-thermal complementary power generation system according to preset conditions to obtain screened data;

[0015] The screened data are preprocessed to obtain initial operation data of the solar-thermal complementary power generation system.

[0016] Optionally, determining the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system includes:

[0017] According to the initial operation data of the solar-thermal complementary power generation system and , determine the heat release time under the maximum regulating load;

[0018] in, is the heat release time under the maximum regulated load, is the thermal efficiency of the heat exchanger, M is the total mass of molten salt stored in the high-temperature tank, i is the step length, is the constant term coefficient of the temperature of the molten salt constant pressure specific heat capacity function, is the temperature of the molten salt at the heat exchanger inlet, is the temperature of the molten salt at the outlet of the heat exchanger, is the reheat steam regulation amount corresponding to the maximum load regulation amount, is the latent heat of phase change of water, is the specific heat of steam at constant pressure, is the steam temperature at the heat exchanger outlet, is the temperature of deoxygenated water at the outlet of the heat exchanger.

[0019] Optionally, determining the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system includes:

[0020] According to the heat release time under the maximum regulation load, the initial operation data of the light-fire complementary power generation system and , determine the peak-shaving power of the solar-thermal complementary power generation system;

[0021] in, To provide peak power for the solar-thermal complementary power generation system. It is the reheat steam regulation amount corresponding to the maximum load regulation amount.

[0022] Optionally, determining the first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system includes:

[0023] According to the peak-shaving electric energy of the solar-thermal complementary power generation system, the initial operation data of the solar-thermal complementary power generation system and , determine the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system;

[0024] According to the peak-shaving power cost of the modified solar-thermal complementary power generation system, the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost are obtained;

[0025] Determining a first control parameter according to the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost adjustment;

[0026] Among them, LCOE is the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system. For debt interest, To extend the operating life of heat exchange and heat storage equipment in the solar-thermal complementary power generation system. For insurance interest, is the average daily cost of initial investment in the solar-thermal complementary power generation system, The operation and maintenance costs of the solar-thermal complementary power generation system. To provide peak-shaving energy for the solar-thermal complementary power generation system.

[0027] Optionally, determining the second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint condition and the preset evaluation model includes:

[0028] Obtaining a predicted load curve according to the initial operation data of the solar-thermal complementary power generation system and the preset constraint conditions;

[0029] According to the predicted load curve and the preset evaluation model , determine the coal saving amount and operating cost of the solar-thermal complementary power generation system;

[0030] Determining a second control parameter according to the coal saving amount of the solar-thermal complementary power generation system and the operating cost of the solar-thermal complementary power generation system;

[0031] in, is the crowding degree of the nth individual, For the nth individual in the objective function The crowding distance on For the nth individual in the objective function The crowding distance on For the n+1th individual The objective function value, For the n-1th individual The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, For the n+1th individual The objective function value, For n-1 individuals The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, The amount of coal saved by the solar-thermal complementary power generation system. The operating cost of the solar-thermal complementary power generation system.

[0032] Optionally, controlling the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter includes:

[0033] According to the first control parameter, an adjustment parameter of the molten salt heat storage device and an adjustment parameter of the solar thermal device are obtained;

[0034] According to the second control parameter, obtaining an adjustment parameter of the coal-fired power generation device;

[0035] Controlling the molten salt heat storage device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the molten salt heat storage device;

[0036] Controlling the photothermal device in the photothermal-thermal complementary power generation system to operate according to the adjustment parameters of the photothermal device;

[0037] The coal-fired power generation device in the light-fired complementary power generation system is controlled to operate according to the adjustment parameters of the coal-fired power generation device.

[0038] A second aspect of the present invention provides a control device for a solar-thermal complementary power generation system, comprising:

[0039] An acquisition module is used to obtain initial operation data and preset constraints of the solar-thermal complementary power generation system;

[0040] A first processing module is used to determine the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system;

[0041] The second processing module is used to determine the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system;

[0042] A third processing module is used to determine a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system;

[0043] A fourth processing module, configured to determine a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model;

[0044] The fifth processing module is used to control the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter.

[0045] According to a third aspect of the present invention, a computing device is provided, comprising: a processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method according to the first aspect is executed.

[0046] A fourth aspect of the present invention provides a computer-readable storage medium storing instructions, which, when executed on a computer, causes the computer to execute the method described in the first aspect.

[0047] The above solution of the present invention includes at least the following beneficial effects:

[0048] The above-mentioned scheme of the present invention obtains the initial operating data and preset constraints of the solar-fire complementary power generation system, calculates the first control parameter and the second control parameter, and then controls the solar-fire complementary power generation system to operate according to the first control parameter and the second control parameter. This can not only improve the operating efficiency of the solar-fire complementary power generation system, but also reduce the operating cost of the solar-fire complementary power generation system, and has the advantages of saving costs and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a flow chart of a control method for a solar-thermal complementary power generation system according to an embodiment of the present invention;

[0050] Figure 2 is a predicted load curve in an embodiment of the present invention;

[0051] Figure 3 is a processing flow chart of a preset target optimization model in an embodiment of the present invention;

[0052] Figure 4 is a graph showing the correspondence between the objective function value and the individual in an embodiment of the present invention;

[0053] Figure 5 is a schematic diagram of the calculation results of the Pareto solution in an embodiment of the present invention;

[0054] Figure 6 It is a structural schematic diagram of a control device for a light-fire complementary power generation system in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0056] like Figure 1 As shown, an embodiment of the present invention provides a control method for a solar-thermal complementary power generation system, comprising the following steps:

[0057] Step 101, obtaining initial operation data and preset constraints of the solar-thermal complementary power generation system;

[0058] Step 102, determining the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system;

[0059] Step 103, determining the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system;

[0060] Step 104, determining a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system;

[0061] Step 105, determining a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model;

[0062] Step 106: Control the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter.

[0063] The control method of the photovoltaic-fire complementary power generation system proposed in the embodiment of the present invention obtains the initial operating data and preset constraints of the photovoltaic-fire complementary power generation system, calculates the first control parameter and the second control parameter, and then controls the photovoltaic-fire complementary power generation system to operate according to the first control parameter and the second control parameter. This can not only improve the operating efficiency of the photovoltaic-fire complementary power generation system, but also reduce the operating cost of the photovoltaic-fire complementary power generation system, and has the advantages of saving costs and improving work efficiency.

[0064] In an optional embodiment of the present invention, step 101 of obtaining initial operation data of the solar-thermal complementary power generation system includes:

[0065] Step 1011, obtaining the initial operation data to be processed of the solar-thermal complementary power generation system;

[0066] Specifically, the operation data of each link and equipment of the solar-thermal complementary power generation system can be comprehensively collected. The initial operation data to be processed of the solar-thermal complementary power generation system may include: the thermal efficiency of the heat exchanger , the total mass M of the molten salt stored in the high-temperature tank, the temperature of the molten salt at the inlet of the heat exchanger , the temperature of molten salt at the outlet of the heat exchanger , Reheat steam regulation corresponding to the maximum load regulation , latent heat of phase change of water Specific heat capacity of steam at constant pressure , Heat exchanger outlet steam temperature , the temperature of deoxygenated water at the outlet of the heat exchanger , Debt interest , the operating life of heat exchange and heat storage equipment in the solar-thermal complementary power generation system , Insurance interest , Daily average cost of initial investment in solar-thermal complementary power generation system , is the operation and maintenance cost of the solar-thermal complementary power generation system. The above is only an example and is not intended to limit the present invention. In a specific embodiment, the corresponding initial operation data to be processed can be obtained according to the parameters used in the subsequent formula. These data can be obtained through the daily operation records of the solar-thermal complementary power generation system or sensor measurements to provide data for the calculation of subsequent control parameters.

[0067] Step 1012, screening the to-be-processed initial operation data of the solar-thermal complementary power generation system according to preset conditions to obtain screened data;

[0068] Specifically, since the initial operating data to be processed of the solar-thermal complementary power generation system may contain data that is not required in subsequent calculations, the data required in the formulas of subsequent steps can be screened and the data that does not participate in the calculations of subsequent steps can be deleted to improve processing efficiency and save computing costs.

[0069] Step 1013, preprocessing the filtered data to obtain initial operation data of the solar-thermal complementary power generation system.

[0070] Specifically, the filtered data can be checked to ensure the accuracy of the data, such as checking whether there are obvious abnormal values ​​or erroneous data in the filtered data, such as negative values, maximum values ​​or minimum values, etc. These values ​​may be caused by sensor failure, data transmission errors or human operation errors. For missing values ​​in the data, it is necessary to select interpolation method, average method or empirical value to fill in according to the characteristics and missing conditions of the data, so as to facilitate subsequent data processing and analysis.

[0071] In an optional embodiment of the present invention, step 102 includes:

[0072] According to the initial operation data of the solar-thermal complementary power generation system and , determine the heat release time under the maximum regulating load;

[0073] in, is the heat release time under the maximum regulated load, is the thermal efficiency of the heat exchanger, M is the total mass of molten salt stored in the high-temperature tank, i is the step length, is the constant term coefficient of the temperature of the molten salt constant pressure specific heat capacity function, is the temperature of the molten salt at the heat exchanger inlet, is the temperature of the molten salt at the outlet of the heat exchanger, is the reheat steam regulation amount corresponding to the maximum load regulation amount, is the latent heat of phase change of water, is the specific heat of steam at constant pressure, is the steam temperature at the heat exchanger outlet, is the temperature of deoxygenated water at the outlet of the heat exchanger.

[0074] Specifically, the load regulation capacity of the molten salt heat storage device is not only constrained by the safe operating range of the steam turbine, but also affected by the heat transfer of the heat exchanger, the total amount of molten salt used, and the heat collection capacity. According to the regulation boundary of the solar-thermal complementary power generation system, in this embodiment, it is assumed that the heat exchanger assists the solar-thermal complementary power generation system in regulating the load at a maximum value of 15%THA (heat rate acceptance condition, THA refers to the power output capacity that can be continuously and stably provided when the steam turbine is in operation, with rated steam inlet parameters, back pressure maintained at the design standard, the heat recovery system operating normally, and the water replenishment rate maintained at zero) every hour. The total amount of molten salt used and the area of ​​the heat collection system are set as variables. If the high-temperature tank stores M tons of molten salt during the regulation process, and the heat exchanger releases heat at the maximum regulation load value, the heat release time under the maximum regulation load can be calculated according to the above formula, which is used for the subsequent calculation of the peak-shaving power of the solar-thermal complementary power generation system.

[0075] In an optional embodiment of the present invention, step 103 includes:

[0076] According to the heat release time under the maximum regulation load, the initial operation data of the light-fire complementary power generation system and , determine the peak-shaving power of the solar-thermal complementary power generation system;

[0077] in, To provide peak power for the solar-thermal complementary power generation system. It is the reheat steam regulation amount corresponding to the maximum load regulation amount.

[0078] Specifically, the peak-shaving electric energy of the solar-thermal complementary power generation system is calculated by the above formula, so as to subsequently obtain the molten salt quality and the optimal collection area of ​​the subsystem with the optimal power cost regulation.

[0079] In an optional embodiment of the present invention, step 104 includes:

[0080] Step 1041, according to the peak load electric energy of the solar-thermal complementary power generation system, the initial operation data of the solar-thermal complementary power generation system and , determine the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system;

[0081] Specifically, by calculating the peak-shaving electricity cost of the transformation of the solar-thermal complementary power generation system, the corresponding simulation result graph is obtained, and the lowest point is obtained in the graph. The molten salt quality and the optimal collection area of ​​the subsystem with the optimal electricity cost regulation can be obtained on the corresponding coordinate axis.

[0082] Step 1042, according to the peak-shaving power cost of the modified solar-thermal complementary power generation system, obtain the molten salt quality and the optimal heat collection area of ​​the subsystem for regulating power cost;

[0083] Specifically, the unit hourly costs of the collector area and molten salt quality are combined with the peak-shaving electricity per hour and converted into the electricity regulation cost. The above formula is numerically simulated in MATLAB (matrix factory) to find the optimal subsystem molten salt quality and optimal collector area for regulating electricity cost corresponding to the minimum value of the function, which are used as the molten salt quality of the heat storage system and the thermal load capacity of the collector system for the optimal peak-shaving operation economy of the unit.

[0084] Step 1043, determining a first control parameter according to the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost adjustment;

[0085] Among them, LCOE is the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system. For debt interest, To extend the operating life of heat exchange and heat storage equipment in the solar-thermal complementary power generation system. For insurance interest, is the average daily cost of initial investment in the solar-thermal complementary power generation system, The operation and maintenance costs of the solar-thermal complementary power generation system. To provide peak-shaving energy for the solar-thermal complementary power generation system.

[0086] Specifically, the first control parameter includes adjusting the molten salt quality and optimal collector area of ​​the subsystem with the optimal electricity cost. These two control parameters are mainly used to control the operation of the molten salt heat storage device and the solar thermal device, which is beneficial to improving the peak-shaving flexibility of the solar-thermal complementary power generation system, achieving low-cost peak-shaving and reducing equipment wear.

[0087] In an optional embodiment of the present invention, step 105 includes:

[0088] Step 1051, obtaining a predicted load curve according to the initial operation data of the solar-thermal complementary power generation system and the preset constraint conditions;

[0089] Specifically, in this embodiment, the target variable randomly takes a value between the maximum and minimum values ​​of the predicted power load, and limits the maximum difference between the random variable and the power load to no more than 15%THA, thereby setting the first preset constraint condition:

[0090]

[0091]

[0092] in, is the minimum value of the power load forecast value, is the unit output power, is the maximum value of the power load forecast value, is the predicted value of power load.

[0093] Under the time sequence conditions, during the heat storage and release regulation process, the quality of the molten salt in the heat storage tank should meet the following second preset constraint conditions:

[0094]

[0095]

[0096]

[0097]

[0098]

[0099]

[0100]

[0101] in, is the mass of molten salt inside the high-temperature molten salt tank within t hours, in units of t, is the mass of molten salt inside the medium-temperature molten salt tank within t hours, in units of t, is the mass of molten salt inside the low-temperature molten salt tank within t hours, in units of t, is the maximum molten salt dosage, is the mass of molten salt inside the high-temperature molten salt tank within t+1 hour, is the mass of molten salt inside the medium-temperature molten salt tank within t+1 hour, is the mass of molten salt inside the low-temperature molten salt tank within t+1 hour, is the total heat storage adjustment time within t hours, in h, It is the total heat release adjustment time within t hours, in h. is the mass flow rate of medium-temperature molten salt flowing into the heat exchanger, is the mass flow rate of high-temperature molten salt flowing into the heat exchanger, The high-temperature molten salt flow required to heat feed water into steam, is the mass flow rate of medium-temperature molten salt flowing into the heat exchanger.

[0102] Here, by setting the total initial molten salt volume of the heat storage system of the complementary system and the heat collection area of ​​the heat collection system, the predicted load curve can be obtained, that is, the short-term solar direct radiation prediction data and the hourly power load data prediction results are as follows: Figure 2 As shown, Figure 2 The horizontal axis represents time, the vertical axis on the left represents direct solar radiation, and the vertical axis on the right represents power load. The curve where the triangle is located represents the forecast data of short-term direct solar radiation changing with time, and the curve where the diamond is located represents the forecast results of hourly power load data changing with time.

[0103] Step 1052: Based on the predicted load curve and the preset evaluation model , determine the coal saving amount and operating cost of the solar-thermal complementary power generation system;

[0104] Specifically, in order to reduce the peak-shaving operation cost and coal consumption of the solar-thermal complementary power generation system under the predicted load curve, based on the preset target optimization model, each group of single-day load operation data output by the boiler of the solar-thermal complementary power generation system that meets the conditions can be labeled and graded by non-dominated sorting, and then the crowding degree between each group of individuals is defined. Based on the Pareto optimal principle, individuals with a larger derivative range are screened and enter a loop iteration until the number of iterations is met. The processing flow of the preset target optimization model is as follows: Figure 3 First, in the first iteration, that is, when the iteration number GEN=1, the unit output of time period t is Initialize and randomly generate a certain number of individuals as the initial population; then merge the parent population and the offspring population generated by genetic operations (selection, crossover, mutation) to form a new, larger population; if the population meets the second preset constraint, merge the population into 2N solutions, otherwise re-perform genetic operations (selection, crossover, mutation); after the population is merged, select individuals from the merged population to form a new parent population according to the non-dominated hierarchy and crowding degree, specifically select individuals with lower non-dominated hierarchies. If the number of individuals in a certain hierarchy is not enough to fill the new parent population, select individuals in that hierarchy according to the crowding degree. Perform crossover and mutation operations on the selected individuals to generate new offspring individuals. The crossover operation is usually used to exchange some genes between two parent individuals to generate new gene combinations, and the mutation operation is used to randomly change certain genes in individuals to increase the diversity of the population. By screening and updating the population, N populations are retained. If the number of iterations GEN is greater than the preset maximum number of iterations MAX, the iteration ends, otherwise the calculation is performed for the next iteration.

[0105] Plot the relationship between the objective function value and the individual Figure 4 As shown, Figure 4 The graph in the figure shows the coal saving of the solar-thermal complementary power generation system (curve 1) and the operating cost of the solar-thermal complementary power generation system (curve 2). Curve 1 shows the coal saving of the solar-thermal complementary power generation system corresponding to the individual, and curve 2 shows the operating cost of the solar-thermal complementary power generation system corresponding to the individual. Figure 4 The middle horizontal axis represents the individual, that is, each group of daily load operation data of the boiler output of the solar-thermal complementary power generation system, the left vertical axis represents the coal saving of the solar-thermal complementary power generation system, and the right vertical axis represents the operating cost of the solar-thermal complementary power generation system. and The corresponding relationship shows that the greater the amount of coal saved, the higher the daily operating cost of the complementary system. The two are a set of contradictory changing relationships. After screening the results, in order to ensure the diversity of the population, the iterative process sets the objective function and The fitness of the Pareto solution corresponding to the maximum value is infinite, so it does not participate in the evaluation; Substituting the remaining Pareto solutions into the calculation results is as follows Figure 5 As shown, Figure 5 The horizontal axis represents the individual, that is, each group of daily load operation data of the boiler output of the solar-thermal complementary power generation system, and the vertical axis represents the congestion. At the same time, the optimal regulation operation state of the complementary system under the predicted load is obtained.

[0106] According to the iteration results, the Pareto solution with coal-saving effect is screened out, and then the congestion value is judged according to the preset evaluation model to obtain the coal saving amount and the operating cost of the solar-thermal complementary power generation system.

[0107] Step 1053, determining a second control parameter according to the coal saving amount of the solar-thermal complementary power generation system and the operation cost of the solar-thermal complementary power generation system;

[0108] in, is the crowding degree of the nth individual, For the nth individual in the objective function The crowding distance on For the nth individual in the objective function The crowding distance on For the n+1th individual The objective function value, For the n-1th individual The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, For the n+1th individual The objective function value, For n-1 individuals The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, The amount of coal saved by the solar-thermal complementary power generation system, The operating cost of the solar-thermal complementary power generation system.

[0109] Specifically, the second control parameter includes the coal saving of the solar-thermal complementary power generation system and the operating cost of the solar-thermal complementary power generation system, and is mainly used to control the coal-fired power generation device to optimize the daily operating cost and coal saving of the solar-thermal complementary power generation system, achieve source-load matching, and improve comprehensive energy consumption.

[0110] In an optional embodiment of the present invention, step 106 includes:

[0111] Step 1061, obtaining adjustment parameters of the molten salt heat storage device and the solar thermal device according to the first control parameters;

[0112] Specifically, according to the molten salt quality of the subsystem with the optimal electricity cost adjustment in the first control parameter, appropriate molten salt type and circulation system configuration parameters are selected as adjustment parameters of the molten salt heat storage device to ensure the stability and efficiency of the molten salt. According to the optimal collection area in the first control parameter, the layout and number of solar collectors are adjusted as adjustment parameters of the solar thermal device to ensure that the solar-thermal complementary power generation system can fully absorb solar energy and convert it into heat energy or electrical energy.

[0113] Step 1062, obtaining an adjustment parameter of the coal-fired power generation device according to the second control parameter;

[0114] Specifically, the output ratio of the photovoltaic power station and the thermal power station is adjusted according to the coal saving amount of the photovoltaic-thermal complementary power generation system in the second control parameter and the operating cost of the photovoltaic-thermal complementary power generation system as the adjustment parameter of the coal-fired power generation device to achieve the dual goals of coal saving and cost control.

[0115] Step 1063, controlling the molten salt heat storage device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the molten salt heat storage device;

[0116] Specifically, the adjustment parameters of the molten salt heat storage device can be input into the main controller of the solar-thermal complementary power generation system or the controller of the molten salt heat storage device to control the molten salt heat storage device to operate according to the adjustment parameters of the molten salt heat storage device and control the molten salt heat storage device to absorb or release the heat load, which is beneficial to the peak-shaving flexibility of the solar-thermal complementary power generation system, can achieve low-cost peak-shaving, and reduce equipment wear.

[0117] Step 1064, controlling the solar-thermal device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the solar-thermal device;

[0118] Specifically, the adjustment parameters of the solar thermal device can be input into the master controller of the solar-thermal complementary power generation system or the controller of the solar thermal device to control the solar thermal device to operate according to the adjustment parameters of the solar thermal device, fully absorb solar energy and convert it into heat energy or electrical energy.

[0119] Step 1065, controlling the coal-fired power generation device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the coal-fired power generation device.

[0120] Specifically, the adjustment parameters of the coal-fired power generation device can be input into the main controller of the solar-thermal complementary power generation system or the controller of the coal-fired power generation device to control the coal-fired power generation device to operate according to the adjustment parameters of the coal-fired power generation device, optimize the daily operating cost and coal saving of the solar-thermal complementary power generation system, achieve source-load matching, and improve comprehensive energy consumption.

[0121] A specific embodiment of the control method of the solar-thermal complementary power generation system proposed in the embodiment of the present invention is:

[0122] Step 111, obtaining data.

[0123] Comprehensively collect the operating data of each link and equipment of the solar-thermal complementary power generation system for subsequent calculations. All data can be obtained through the operating records of the solar-thermal complementary power generation system, or data can be obtained purposefully according to the parameters in the formula used later.

[0124] Step 112, calculating the heat release time under the maximum regulation load.

[0125] According to the initial operation data of the solar-thermal complementary power generation system, the thermal efficiency of the heat exchanger, the total mass of the molten salt stored in the high-temperature tank, the constant term coefficient of the temperature of the molten salt constant-pressure specific heat function, the temperature of the molten salt at the heat exchanger inlet, the temperature of the molten salt at the heat exchanger outlet, the reheat steam adjustment amount corresponding to the maximum load adjustment amount, the phase change latent heat of water, the constant-pressure specific heat of steam, the steam temperature at the heat exchanger outlet, the temperature of the deoxygenated water at the heat exchanger outlet and , calculate the heat release time under the maximum regulation load .

[0126] Step 113, calculating the peak-shaving electric energy of the solar-thermal complementary power generation system.

[0127] According to the heat release time under the maximum regulation load, the reheat steam regulation amount corresponding to the maximum load regulation amount in the initial operation data of the solar-thermal complementary power generation system and , calculate the peak power of the solar-thermal complementary power generation system .

[0128] Step 114, calculating a first control parameter.

[0129] First, according to the peak-shaving power of the solar-thermal complementary power generation system, the debt interest in the initial operation data of the solar-thermal complementary power generation system, the operating life of the heat exchange and heat storage equipment in the solar-thermal complementary power generation system, the insurance interest, the average daily cost of the initial investment of the solar-thermal complementary power generation system, the operation and maintenance cost of the solar-thermal complementary power generation system and , calculate the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system ;

[0130] Then, the unit hourly cost of the collector area and molten salt quality is combined with the peak-shaving electricity per hour and converted into the electricity regulation cost. The above formula is numerically simulated in MATLAB (Matrix Factory) to find the optimal subsystem molten salt quality and optimal collector area for regulating electricity cost corresponding to the minimum value of the function. The molten salt quality of the heat storage system and the thermal load capacity of the collector system with the best peak-shaving operation economy of the unit are used as the first control parameters.

[0131] Step 115, calculating the second control parameter.

[0132] According to the preset first preset constraint condition and the second preset constraint condition, the molten salt mass in the heat storage tank and the unit output in time period t are determined, and then the predicted load curve can be obtained according to the set initial total amount of molten salt in the heat storage system of the complementary system and the configured collection area of ​​the collection system; in order to reduce the peak-shaving operation cost and coal consumption of the solar-thermal complementary power generation system under the predicted load curve, based on the preset target optimization model, each group of single-day load operation data of the boiler output of the solar-thermal complementary power generation system that meets the conditions can be labeled and graded by non-dominated sorting, and then the crowding degree between each group of individuals is defined, and based on the Pareto optimal principle, individuals with a larger derivative range are screened out and enter a loop iteration until the number of iterations is met, and the coal saving of the solar-thermal complementary power generation system and the operating cost of the solar-thermal complementary power generation system are obtained as the second control parameter.

[0133] Step 116, controlling the operation of the solar-thermal complementary power generation system.

[0134] The molten salt heat storage device, solar thermal device and coal-fired power generation device in the solar-thermal complementary power generation system are controlled to operate according to the calculated control parameters. Improving the peak-shaving flexibility of the solar-thermal complementary power generation system can achieve low-cost peak-shaving while reducing equipment wear. At the same time, it optimizes the daily operating cost and coal saving of the solar-thermal complementary power generation system, achieves source-load matching, and improves comprehensive energy consumption.

[0135] The control method of the photovoltaic-thermal complementary power generation system proposed in the embodiment of the present invention can optimize the daily operating cost and coal saving of the complementary system, achieve source-load matching, and improve comprehensive energy consumption. Controlling the absorption or release of heat load by the molten salt heat storage device is conducive to the peak-shaving flexibility of the photovoltaic-thermal complementary power generation system, and can achieve low-cost peak-shaving while reducing equipment wear. Taking the load regulation amount of the photovoltaic-thermal complementary power generation system as the key variable, the peak-shaving load value of the coal-fired unit is optimized; using the preset target optimization model, the power load optimization pre-scheduling of the complementary power generation system is realized to improve energy utilization efficiency. The obtained single-day optimal operation control parameters can be used to formulate a reasonable load operation scheduling strategy for the photovoltaic-thermal complementary power generation system, and reduce the instability of the photovoltaic-thermal complementary power generation system after the introduction of solar energy; avoid the photovoltaic-thermal complementary power generation system under load fluctuations. Abandonment of heat and electricity is avoided to reduce energy waste. It can be seen from the optimization results of the various diagrams obtained from the data simulation that the economy, coal saving, and peak-shaving flexibility of the photovoltaic-thermal complementary power generation system are improved.

[0136] like Figure 6 As shown, the embodiment of the present invention provides a control device 200 for a solar-thermal complementary power generation system, comprising:

[0137] An acquisition module 201 is used to acquire initial operation data and preset constraints of the solar-thermal complementary power generation system;

[0138] The first processing module 202 is used to determine the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system;

[0139] The second processing module 203 is used to determine the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system;

[0140] The third processing module 204 is used to determine the first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system;

[0141] The fourth processing module 205 is used to determine the second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint condition and the preset evaluation model;

[0142] The fifth processing module 206 is used to control the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter.

[0143] Optionally, obtain initial operation data of the solar-thermal complementary power generation system, including:

[0144] Obtain the initial operation data to be processed of the solar-thermal complementary power generation system;

[0145] Screening the to-be-processed initial operation data of the solar-thermal complementary power generation system according to preset conditions to obtain screened data;

[0146] The screened data are preprocessed to obtain initial operation data of the solar-thermal complementary power generation system.

[0147] Optionally, determining the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system includes:

[0148] According to the initial operation data of the solar-thermal complementary power generation system and , determine the heat release time under the maximum regulating load;

[0149] in, is the heat release time under the maximum regulated load, is the thermal efficiency of the heat exchanger, M is the total mass of molten salt stored in the high-temperature tank, i is the step length, is the constant term coefficient of the temperature of the molten salt constant pressure specific heat capacity function, is the temperature of the molten salt at the heat exchanger inlet, is the temperature of the molten salt at the outlet of the heat exchanger, is the reheat steam regulation amount corresponding to the maximum load regulation amount, is the latent heat of phase change of water, is the specific heat of steam at constant pressure, is the steam temperature at the heat exchanger outlet, is the temperature of deoxygenated water at the outlet of the heat exchanger.

[0150] Optionally, determining the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system includes:

[0151] According to the heat release time under the maximum regulation load, the initial operation data of the light-fire complementary power generation system and , determine the peak-shaving power of the solar-thermal complementary power generation system;

[0152] in, To provide peak power for the solar-thermal complementary power generation system. It is the reheat steam regulation amount corresponding to the maximum load regulation amount.

[0153] Optionally, determining the first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system includes:

[0154] According to the peak-shaving electric energy of the solar-thermal complementary power generation system, the initial operation data of the solar-thermal complementary power generation system and , determine the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system;

[0155] According to the peak-shaving power cost of the modified solar-thermal complementary power generation system, the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost are obtained;

[0156] Determining a first control parameter according to the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost adjustment;

[0157] Among them, LCOE is the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system. For debt interest, To extend the operating life of heat exchange and heat storage equipment in the solar-thermal complementary power generation system. For insurance interest, is the average daily cost of initial investment in the solar-thermal complementary power generation system, The operation and maintenance costs of the solar-thermal complementary power generation system. To provide peak-shaving energy for the solar-thermal complementary power generation system.

[0158] Optionally, determining the second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint condition and the preset evaluation model includes:

[0159] Obtaining a predicted load curve according to the initial operation data of the solar-thermal complementary power generation system and the preset constraint conditions;

[0160] According to the predicted load curve and the preset evaluation model , determine the coal saving amount and operating cost of the solar-thermal complementary power generation system;

[0161] Determining a second control parameter according to the coal saving amount of the solar-thermal complementary power generation system and the operating cost of the solar-thermal complementary power generation system;

[0162] in, is the crowding degree of the nth individual, For the nth individual in the objective function The crowding distance on For the nth individual in the objective function The crowding distance on For the n+1th individual The objective function value, For the n-1th individual The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, For the n+1th individual The objective function value, For n-1 individuals The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, The amount of coal saved by the solar-thermal complementary power generation system, The operating cost of the solar-thermal complementary power generation system.

[0163] Optionally, controlling the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter includes:

[0164] According to the first control parameter, an adjustment parameter of the molten salt heat storage device and an adjustment parameter of the solar thermal device are obtained;

[0165] According to the second control parameter, obtaining an adjustment parameter of the coal-fired power generation device;

[0166] Controlling the molten salt heat storage device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the molten salt heat storage device;

[0167] Controlling the photothermal device in the photothermal-thermal complementary power generation system to operate according to the adjustment parameters of the photothermal device;

[0168] The coal-fired power generation device in the light-fired complementary power generation system is controlled to operate according to the adjustment parameters of the coal-fired power generation device.

[0169] The control device of the photovoltaic-fire complementary power generation system proposed in the embodiment of the present invention obtains the initial operating data and preset constraints of the photovoltaic-fire complementary power generation system, calculates the first control parameter and the second control parameter, and then controls the photovoltaic-fire complementary power generation system to operate according to the first control parameter and the second control parameter. This can not only improve the operating efficiency of the photovoltaic-fire complementary power generation system, but also reduce the operating cost of the photovoltaic-fire complementary power generation system, and has the advantages of saving costs and improving work efficiency.

[0170] It should be noted that the device is a device corresponding to the above method, and all implementations in the above method embodiment are applicable to the embodiment of the device and can achieve the same technical effect. This embodiment will not be repeated.

[0171] The embodiment of the present invention further provides a computing device, comprising: a processor, and a memory storing a computer program, wherein when the computer program is executed by the processor, the method described in any one of the above embodiments is executed. All implementations in the above method embodiments are applicable to the embodiments of the device, and can achieve the same technical effects. They will not be described in detail in this embodiment.

[0172] The embodiment of the present invention further provides a computer-readable storage medium on which instructions are stored. When the instructions are executed on a computer, the computer executes the method as described in any one of the above embodiments. All implementations in the above method embodiments are applicable to the embodiments of the device and can achieve the same technical effects. They will not be described in detail in this embodiment.

[0173] It should be noted that, in the above-mentioned embodiments, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "include one..." do not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the implementation of the above-mentioned embodiments is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0174] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for a solar-thermal complementary power generation system, characterized in that: include: Obtain the initial operating data and preset constraints of the solar-thermal complementary power generation system; Determining the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system; Determine the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system; Determine a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system; Determining a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model; Controlling the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter; Wherein, according to the initial operation data of the solar-thermal complementary power generation system, determining the heat release time under the maximum regulation load includes: According to the initial operation data of the solar-thermal complementary power generation system and , determine the heat release time under the maximum regulating load; in, is the heat release time under the maximum regulated load, is the thermal efficiency of the heat exchanger, M is the total mass of molten salt stored in the high-temperature tank, i is the step length, is the constant term coefficient of the temperature of the molten salt constant pressure specific heat capacity function, is the temperature of the molten salt at the heat exchanger inlet, is the temperature of the molten salt at the outlet of the heat exchanger, is the reheat steam regulation amount corresponding to the maximum load regulation amount, is the latent heat of phase change of water, is the specific heat of steam at constant pressure, is the steam temperature at the heat exchanger outlet, is the temperature of deoxygenated water at the outlet of the heat exchanger.

2. The control method of the solar-thermal complementary power generation system according to claim 1 is characterized in that: Obtain the initial operating data of the solar-thermal complementary power generation system, including: Obtain the initial operation data to be processed of the solar-thermal complementary power generation system; Screening the to-be-processed initial operation data of the solar-thermal complementary power generation system according to preset conditions to obtain screened data; The screened data are preprocessed to obtain initial operation data of the solar-thermal complementary power generation system.

3. The control method of the solar-thermal complementary power generation system according to claim 1 is characterized in that: Determining the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system comprises: According to the heat release time under the maximum regulation load, the initial operation data of the light-fire complementary power generation system and , determine the peak-shaving power of the solar-thermal complementary power generation system; in, To provide peak power for the solar-thermal complementary power generation system. It is the reheat steam regulation amount corresponding to the maximum load regulation amount.

4. The control method of the solar-thermal complementary power generation system according to claim 1 is characterized in that: Determining a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system includes: According to the peak-shaving electric energy of the solar-thermal complementary power generation system, the initial operation data of the solar-thermal complementary power generation system and , determine the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system; According to the peak-shaving power cost of the modified solar-thermal complementary power generation system, the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost are obtained; Determining a first control parameter according to the molten salt quality and the optimal heat collection area of ​​the subsystem with the optimal power cost adjustment; Among them, LCOE is the peak-shaving power cost of the transformation of the solar-thermal complementary power generation system. For debt interest, To extend the operating life of heat exchange and heat storage equipment in the solar-thermal complementary power generation system. For insurance interest, is the average daily cost of initial investment in the solar-thermal complementary power generation system, The operation and maintenance costs of the solar-thermal complementary power generation system, To provide peak-shaving energy for the solar-thermal complementary power generation system.

5. The control method of the solar-thermal complementary power generation system according to claim 1, characterized in that: Determining a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model includes: Obtaining a predicted load curve according to the initial operation data of the solar-thermal complementary power generation system and the preset constraint conditions; According to the predicted load curve and the preset evaluation model , determine the coal saving amount and operating cost of the solar-thermal complementary power generation system; Determining a second control parameter according to the coal saving amount of the solar-thermal complementary power generation system and the operating cost of the solar-thermal complementary power generation system; in, is the crowding degree of the nth individual, For the nth individual in the objective function The crowding distance on For the nth individual in the objective function The crowding distance on For the n+1th individual The objective function value, For the n-1th individual The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, For the n+1th individual The objective function value, For n-1 individuals The objective function value, Find the corresponding The maximum value of the objective function, Find the corresponding The minimum value of the objective function, The amount of coal saved by the solar-thermal complementary power generation system, The operating cost of the solar-thermal complementary power generation system.

6. The control method of the solar-thermal complementary power generation system according to claim 1, characterized in that: Controlling the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter includes: According to the first control parameter, an adjustment parameter of the molten salt heat storage device and an adjustment parameter of the solar thermal device are obtained; According to the second control parameter, obtaining an adjustment parameter of the coal-fired power generation device; Controlling the molten salt heat storage device in the solar-thermal complementary power generation system to operate according to the adjustment parameters of the molten salt heat storage device; Controlling the photothermal device in the photothermal-thermal complementary power generation system to operate according to the adjustment parameters of the photothermal device; The coal-fired power generation device in the light-fired complementary power generation system is controlled to operate according to the adjustment parameters of the coal-fired power generation device.

7. A control device for a solar-thermal complementary power generation system, characterized in that: include: An acquisition module is used to obtain initial operation data and preset constraints of the solar-thermal complementary power generation system; A first processing module is used to determine the heat release time under the maximum regulation load according to the initial operation data of the solar-thermal complementary power generation system; The second processing module is used to determine the peak-shaving electric energy of the solar-thermal complementary power generation system according to the heat release time under the maximum regulation load and the initial operation data of the solar-thermal complementary power generation system; A third processing module is used to determine a first control parameter according to the peak-shaving electric energy of the solar-thermal complementary power generation system and the initial operation data of the solar-thermal complementary power generation system; A fourth processing module, configured to determine a second control parameter according to the initial operation data of the solar-thermal complementary power generation system, the preset constraint conditions and the preset evaluation model; A fifth processing module, used for controlling the solar-thermal complementary power generation system to operate according to the first control parameter and the second control parameter; Wherein, according to the initial operation data of the solar-thermal complementary power generation system, determining the heat release time under the maximum regulation load includes: According to the initial operation data of the solar-thermal complementary power generation system and , determine the heat release time under the maximum regulating load; in, is the heat release time under the maximum regulated load, is the thermal efficiency of the heat exchanger, M is the total mass of molten salt stored in the high-temperature tank, i is the step length, is the constant term coefficient of the temperature of the molten salt constant pressure specific heat capacity function, is the temperature of the molten salt at the heat exchanger inlet, is the temperature of the molten salt at the outlet of the heat exchanger, is the reheat steam regulation amount corresponding to the maximum load regulation amount, is the latent heat of phase change of water, is the specific heat of steam at constant pressure, is the steam temperature at the heat exchanger outlet, is the temperature of deoxygenated water at the outlet of the heat exchanger.

8. A computing device, characterized in that include: A processor and a memory storing a computer program, wherein when the computer program is executed by the processor, the method according to any one of claims 1 to 6 is executed.

9. A computer-readable storage medium, characterized in that: Instructions are stored, and when the instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 6.

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