Differential pressure power generation pressure regulation station selection method, device and equipment and storage medium

Abstract

The invention discloses a differential pressure power generation pressure regulation station selection method and device, equipment and a storage medium. The method comprises the steps of obtaining preprocessed operation data of N1 to-be-selected pressure regulation stations; calculating an operation coefficient of each to-be-selected voltage regulation station based on the preprocessed operation data; on the basis of the preprocessed operation data, N2 initial pressure regulation stations are selected from N1 to-be-selected pressure regulation stations; and calculating the physics of the natural gas at each initial pressure regulating station based on the operation coefficient and the physical and economical mathematical model of the natural gas, and selecting a preset number of target pressure regulating stations from the N2 initial pressure regulating stations. According to the invention, the technical problem that the voltage regulation station suitable for power generation cannot be accurately selected in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas pressure energy recycling, and particularly relates to a differential pressure power generation pressure regulating station site selection method, device, equipment and storage medium. BACKGROUND

[0002] At present, traditional power generation relies heavily on traditional methods such as fossil fuel combustion or nuclear reaction, which may have adverse environmental impacts and resource limitations. In contrast, differential pressure power generation is an essentially more efficient and low-carbon alternative method, and is a sustainable and more environmentally friendly energy solution.

[0003] However, not all pressure regulating stations have the necessary characteristics to effectively generate power using pressure energy, and one of the challenges in implementing a power generation system at a pressure regulating station is to identify and select suitable pressure regulating stations to recover excess pressure. Therefore, an effective screening method is needed to determine the most suitable pressure regulating stations for power generation. SUMMARY

[0004] The present application provides a differential pressure power generation pressure regulating station site selection method, device, equipment and storage medium, which can solve the technical problem that the prior art cannot accurately select suitable pressure regulating stations for power generation.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a differential pressure power generation pressure regulating station site selection method, which comprises:

[0007] obtaining pre-processed operating data of N1 candidate pressure regulating stations;

[0008] based on the pre-processed operating data, calculating an operating coefficient of each candidate pressure regulating station;

[0009] based on the pre-processed operating data, selecting N2 initial pressure regulating stations from the N1 candidate pressure regulating stations;

[0010] calculating the physical properties of natural gas at each initial pressure regulating station;

[0011] based on the operating coefficient, the physical properties of natural gas and an economic mathematical model, selecting a preset number of target pressure regulating stations from the N2 initial pressure regulating stations.

[0012] In a second aspect, the present application provides a differential pressure power generation pressure regulating station site selection device, which comprises:

[0013] an information acquisition module configured to acquire pre-processed operating data of N1 candidate pressure regulating stations; ​

[0014] The first calculation module is configured to calculate an operation coefficient of each candidate pressure regulating station based on the preprocessed operation data;

[0015] The first selection module is configured to select N2 initial pressure regulating stations from the N1 candidate pressure regulating stations based on the preprocessed operation data;

[0016] The second calculation module is configured to calculate physical parameters of natural gas at each initial pressure regulating station based on the operation coefficient and the preprocessed operation data;

[0017] The second selection module is configured to select a preset number of target pressure regulating stations from the N2 initial pressure regulating stations based on the operation coefficient, the physical parameters of natural gas, and an economic mathematical model.

[0018] In a third aspect, an electronic device is provided, which includes a memory and a processor. The processor is configured to read and execute a computer program stored in the memory, so as to implement the steps of the pressure difference power generation pressure regulating station selection method.

[0019] In a fourth aspect, a computer storage medium is provided, which stores computer executable instructions. The computer executable instructions implement the steps of the pressure difference power generation pressure regulating station selection method when executed.

[0020] In a fourth aspect, a computer program product is provided, which includes computer programs / instructions. The computer programs / instructions implement the steps of the pressure difference power generation pressure regulating station selection method when executed by a processor.

[0021] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0022] By considering the inlet pressure range, the stability of pressure and flow, the pressure ratio range, and the implementation economic operation data, and by optimizing the pressure regulating station from the perspective of optimal installed capacity, the accuracy of the method is ensured, the energy utilization rate of the power generation industry is improved, and the carbon emission amount is reduced. Through the present application, the technical problem that the pressure regulating station suitable for power generation cannot be accurately selected in the related art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort. ​

[0024] Figure 1 The flowchart of the first embodiment of the differential pressure power generation voltage regulation site selection method of the present application is shown in FIG. 1.

[0025] Figure 2 The detailed flowchart of step S30 is shown in FIG. 3. Figure 1

[0026] Figure 3 The detailed flowchart of step S50 is shown in FIG. 5. Figure 1

[0027] The general structure of the differential pressure power generation is shown in FIG. 6. Figure 4

[0028] The functional module diagram of one embodiment of the differential pressure power generation voltage regulation site selection device of the present application is shown in FIG. 7. Figure 5

[0029] The structure diagram of one electronic device of the embodiment of the present application is shown in FIG. 8. Figure 6 DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings.

[0032] In a first aspect, the embodiments of the present application provide a differential pressure power generation voltage regulation site selection method.

[0033] In one embodiment, the differential pressure power generation voltage regulation site selection method comprises the following steps. Figure 1 Figure 1 The flowchart of the first embodiment of the differential pressure power generation voltage regulation site selection method of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the differential pressure power generation voltage regulation site selection method comprises the following steps.

[0034] Step S10, obtaining the pre-processed operation data of N1 candidate voltage regulation sites;

[0035] In some specific embodiments, step S10 comprises the following steps.

[0036] Obtaining the operation data of N1 candidate voltage regulation sites every hour within a data collection period T;

[0037] ​​​The operation data is preprocessed by using a box plot method and a linear interpolation method to obtain preprocessed operation data of the N1 selected pressure regulating stations.

[0038] In this embodiment, first, a geographical range of the pressure difference power generation implementation is planned, and operation data of N1 (N1≥1) selected pressure regulating stations in each hour within a data collection period T (T≥24, for example, one year, T=8760) in the geographical range of the pressure difference power generation implementation is collected.

[0039] The operation data includes an inlet pressure sequence an outlet pressure sequence a natural gas actual volume flow sequence Q i ={Q i,t |1≤t≤T}, an inlet temperature sequence and a density of pure methane.

[0040] Second, the operation data of the N1 selected pressure regulating stations in each hour within the data collection period T is preprocessed by using the box plot method and the linear interpolation method to obtain preprocessed operation data.

[0041] Mainly includes: using the box plot method to identify and eliminate outliers in the original data, and using the linear interpolation method to complete the missing data in a short period. Wherein, the outliers in the original data are identified and eliminated by using the box plot method, specifically: the sequence elements are arranged, and the median (Q2) is found, which divides the sequence into two parts. Then find the median of the two parts of the sequence respectively (i.e. Q1 and Q3). In this way, through Q1, Q2 and Q3, the sequence is divided into four parts, each part contains the same number of data points (or as close as possible). Based on the lower quartile (Q1), the median (Q2) and the upper quartile (Q3), the outlier judgment expression is: when the data x>Q3+3(Q3-Q1) or the data xQ1-3(Q3-Q1), the data x is determined as an extreme outlier point and is eliminated.

[0042] In step S20, the operation coefficient of each selected pressure regulating station is calculated based on the preprocessed operation data.

[0043] In some specific embodiments, the operation data includes a natural gas actual volume flow sequence, and the step S20 includes:

[0044] For the i-th selected pressure regulating station, the preprocessed natural gas actual volume flow of the i-th selected pressure regulating station is substituted into a first preset formula to calculate the operation coefficient of the i-th selected pressure regulating station.

[0045] The first preset formula is as follows:

[0046]

[0047] In the formula, Q min,i is the minimum actual volume flow of natural gas to support differential pressure power generation, is the natural gas actual volume flow sequence of the N1 candidate pressure regulating sites that meet |Q i ≥Q i,t ≥Q min,i |Q i is the natural gas actual volume flow sequence of the i-th candidate pressure regulating site in the period T, |Q i ={Q i,t |1≤t≤T} is the time, T is the data acquisition period, Q i,t is the natural gas actual volume flow of the i-th candidate pressure regulating site at time t, T i is the data acquisition period of the i-th candidate pressure regulating site, ζ i is the operation coefficient of the i-th candidate pressure regulating site.

[0048] Similarly, the operation coefficient of each candidate pressure regulating site is calculated.

[0049] In this embodiment, the operation coefficient of the candidate pressure regulating site is the ratio of the length of time that can be used for differential pressure power generation in the data acquisition period to the data acquisition period.

[0050] Specifically, the natural gas actual volume flow sequence of the i-th candidate pressure regulating site that can be used for differential pressure power generation is counted, that is, the natural gas actual volume flow that meets |Q i ≥Q i,t ≥Q min,i is the natural gas actual volume flow that can be used for differential pressure power generation, and the natural gas actual volume flow sequence of the i-th candidate pressure regulating site that can be used for differential pressure power generation after preprocessing is : The number of natural gas actual volume flows that can be used for differential pressure power generation, that is, the number of lengths of time that can be used for differential pressure power generation in the data acquisition period. The operation coefficient ζ i of the i-th candidate pressure regulating site is:

[0051]

[0052] Similarly, the operation coefficient of each candidate pressure regulating site is calculated. Wherein, 1≤i≤N1.

[0053] Step S30, selecting N2 initial pressure regulating sites from the N1 candidate pressure regulating sites based on the preprocessed operation data;

[0054] In some specific embodiments, with reference to Figure 2 ,Figure 2 For Figure 2 For Figure 1 The detailed flowchart of step S30. As shown in the figure, step S30 includes: Figure 2

[0055] Step S301, based on the pre-processed operation data, calculates the average inlet pressure, average pressure ratio and average actual gas volume flow rate of each candidate pressure regulating station;

[0056] In some specific embodiments, the operation data includes inlet pressure sequence, outlet pressure sequence, actual gas volume flow rate sequence, inlet temperature sequence and density of pure methane, and step S301 includes:

[0057] For the i-th candidate pressure regulating station, the average inlet pressure of the i-th candidate pressure regulating station is obtained by dividing the inlet pressure sequence of the i-th candidate pressure regulating station by the data collection period T;

[0058] The pre-processed inlet pressure sequence and outlet pressure sequence of the i-th candidate pressure regulating station per hour within the data collection period T are substituted into the second preset formula to calculate the average pressure ratio of the i-th candidate pressure regulating station, and the second preset formula is as follows:

[0059]

[0060] In the formula, is the average pressure ratio of the i-th candidate pressure regulating station, γ i,t is the pressure ratio of the i-th candidate pressure regulating station at time t, is the inlet pressure of the i-th candidate pressure regulating station at time t, is the outlet pressure of the i-th candidate pressure regulating station at time t, i ={γ i，t 1≤t≤T}, |Γ i is the pressure ratio sequence of the i-th candidate pressure regulating station within the period T, and T is the data collection period;

[0061] The average actual gas volume flow rate of the i-th candidate pressure regulating station is obtained by dividing the actual gas volume flow rate sequence of the i-th candidate pressure regulating station by the data collection period T;

[0062] Similarly, the average inlet pressure, average pressure ratio and average actual gas volume flow rate of each candidate pressure regulating station are calculated.

[0063] In this embodiment, the operation data includes inlet pressure sequence, outlet pressure sequence, actual gas volume flow rate sequence, inlet temperature sequence and density of pure methane. ​

[0064] For the ith candidate pressure regulating station, the average import pressure of the ith candidate pressure regulating station is obtained by dividing the import pressure sequence of the ith candidate pressure regulating station by the data collection period T That is, Wherein, is the import pressure sequence, is the import pressure of the ith candidate pressure regulating station at time t.

[0065] The preprocessed import pressure sequence and the export pressure sequence of the ith candidate pressure regulating station per hour within the data collection period T are substituted into the second preset formula That is, the average pressure ratio of the ith candidate pressure regulating station can be calculated.

[0066] The average natural gas actual volume flow of the ith candidate pressure regulating station is obtained by dividing the natural gas actual volume flow sequence of the ith candidate pressure regulating station by the data collection period T That is, Wherein, |Q>i={Q i,t 1≤t≤T},|Q> i is the natural gas actual volume flow sequence of the ith candidate pressure regulating station, Q i,t is the natural gas actual volume flow of the ith candidate pressure regulating station at time t.

[0067] By analogy, the average import pressure, the average pressure ratio and the average natural gas actual volume flow of each candidate pressure regulating station can be calculated.

[0068] In step S302, based on the average pressure ratio and the average natural gas actual volume flow, the coefficient of variation of the pressure ratio and the coefficient of variation of the natural gas actual volume flow of each candidate pressure regulating station are calculated.

[0069] In some specific embodiments, step S302 comprises:

[0070] For the ith candidate pressure regulating station, the standard deviation of the pressure ratio and the standard deviation of the natural gas actual volume flow of the ith candidate pressure regulating station are calculated.

[0071] The standard deviation of the pressure ratio of the ith candidate pressure regulating station is divided by the absolute value of the quotient of the average pressure ratio of the ith candidate pressure regulating station, as the coefficient of variation of the pressure ratio of the ith candidate pressure regulating station.

[0072] The standard deviation of the natural gas actual volume flow of the ith candidate pressure regulating station is divided by the absolute value of the quotient of the average natural gas actual volume flow of the ith candidate pressure regulating station, as the coefficient of variation of the natural gas actual volume flow of the ith candidate pressure regulating station.

[0073] Similarly, the coefficient of variation of the pressure ratio of each candidate pressure regulating station and the coefficient of variation of the actual volume flow of natural gas are obtained.

[0074] In this embodiment, the volatility of the candidate pressure regulating station is determined based on the coefficient of variation of the pressure ratio of each candidate pressure regulating station and the coefficient of variation of the actual volume flow of natural gas, so as to eliminate the candidate pressure regulating station with frequent fluctuations or large fluctuation amplitude, thereby ensuring the implementability of the pressure difference power generation project of the candidate pressure regulating station.

[0075] For the i th candidate pressure regulating station, the standard deviation σ of the pressure ratio of the i th candidate pressure regulating station is calculated γ,i , and the standard deviation σ of the actual volume flow of natural gas is calculated Q,i .

[0076] Wherein, In the formula, γ i,t is the pressure ratio of the i th candidate pressure regulating station at time t, is the average pressure ratio of the i th candidate pressure regulating station, T is the data acquisition period, and Q i,t is the actual volume flow of natural gas of the i th candidate pressure regulating station at time t, is the average actual volume flow of natural gas of the i th candidate pressure regulating station.

[0077] The absolute value of the quotient of the standard deviation of the pressure ratio of the i th candidate pressure regulating station divided by the average pressure ratio of the i th candidate pressure regulating station is taken as the coefficient of variation λ of the pressure ratio of the i th candidate pressure regulating station γ,i .

[0078] The absolute value of the quotient of the standard deviation of the actual volume flow of natural gas of the i th candidate pressure regulating station divided by the average actual volume flow of natural gas of the i th candidate pressure regulating station is taken as the coefficient of variation λ of the actual volume flow of natural gas of the i th candidate pressure regulating station Q,i .

[0079] Similarly, the coefficient of variation of the pressure ratio of each candidate pressure regulating station and the coefficient of variation of the actual volume flow of natural gas are calculated.

[0080] In step S303, N2 initial pressure regulating stations are selected from N1 candidate pressure regulating stations based on the average inlet pressure, the average pressure ratio, the average actual volume flow of natural gas, the coefficient of variation of the pressure ratio, and the coefficient of variation of the actual volume flow of natural gas.

[0081] In some specific embodiments, step S303 comprises:

[0082] From N1 candidate pressure regulating stations, N2 initial pressure regulating stations are determined that meet the selection criteria, wherein the selection criteria are: the average inlet pressure, the average pressure ratio, the average actual natural gas volume flow rate, the coefficient of variation of the pressure ratio, and the coefficient of variation of the actual natural gas volume flow rate are within the corresponding preset ranges.

[0083] In this embodiment, a preliminary screening is first performed, that is, N2 initial pressure regulating stations that meet the conditions are selected from N1 candidate pressure regulating stations. The selection conditions are: the average inlet pressure, average pressure ratio, average actual natural gas volume flow rate, coefficient of variation of pressure ratio, and coefficient of variation of actual natural gas volume flow rate are all within the corresponding preset range.

[0084] Specifically, the average inlet pressure should meet P (in) ≤P MAX PMAX is the maximum inlet pressure supported by existing technology, such as 10 MPa;

[0085] The average pressure ratio should satisfy: 1.1 ≤ γ ≤ γ MAX , where γ MAX The maximum pressure ratio supported by existing technology, such as 7;

[0086] The average actual volumetric flow rate of natural gas should meet the following requirement: Q min ≤Q r ≤Q MAX Q min The minimum actual volumetric flow rate of natural gas supported by existing technology is 0.5 m³. 3 / s;Q MAX The maximum actual volumetric flow rate of natural gas supported by existing technology, such as 30m³. 3 / s;

[0087] The coefficient of variation of the pressure ratio or the coefficient of variation of the actual volumetric flow rate of natural gas satisfies: λ≤λ MAX , where λ MAX The coefficient of variation is the maximum level of fluctuation supported by existing technology, such as 0.5;

[0088] The candidate voltage regulating stations that meet the above selection criteria are the N2 initial voltage regulating stations.

[0089] Step S40: Calculate the physical properties of natural gas at each initial pressure regulating station.

[0090] In some specific embodiments, step S40 includes:

[0091] Based on the third preset formula, the physical properties of natural gas at each initial pressure regulating station are calculated.

[0092] The third preset formula is as follows:

[0093]

[0094] In the formula, For the actual volumetric flow rate of natural gas after pretreatment at N1 candidate pressure regulating stations, |Q> i ∧Q i,t ≥Q min,i The actual volumetric flow rate sequence of natural gas, Let be the pre-processed natural gas flow rate of the i-th candidate pressure regulating station. Let be the average natural gas flow rate after preprocessing at the i-th candidate pressure regulating station. Let ρ be the pre-processed natural gas flow rate of the i-th candidate pressure regulating station at time t. i Let be the density of the pure methane after pretreatment at the i-th candidate pressure regulating station. Natural gas specific mass

[0095] In this embodiment, the natural gas differential pressure power generation and cold energy recovery are affected by multiple factors due to differences in pressure, flow rate, and functional roles at different stages throughout the natural gas production process. First, a comparative analysis method is used to analyze the influencing factors of differential pressure power generation at each site. The analytical method was used to analyze the power generation potential of pressure difference at each site and to construct an assessment model for the power generation potential of natural gas residual pressure at each site.

[0096] From a thermodynamic perspective, a natural gas pipeline network can be considered an open system. According to thermodynamic theory, the flow rate of a unit mass of stable material... It is a commonly used parameter in the field of energy science for evaluating the value of energy utilization. When natural gas undergoes adiabatic isentropic expansion, both its pressure and temperature decrease during the expansion process. It can be defined as the maximum amount of energy in natural gas that can be reversibly converted into work under a certain temperature condition, and therefore, the energy of natural gas in a certain state... This refers to its maximum theoretical working capacity.

[0097] For the i-th initial voltage regulation station, the specific quality It can be represented as:

[0098]

[0099] In the formula: The natural gas specific mass at the i-th initial pressure regulating station Units: kJ / kg; C p,i Let be the isobaric specific heat capacity of natural gas at the i-th initial pressure regulating station, in kJ / (kg·K); Let be the inlet natural gas temperature of the i-th initial pressure regulating station. The lowest outlet natural gas temperature at the i-th initial pressure regulating station, in K; Let i be the ambient temperature of the i-th initial voltage regulating station. Let represent the molar mass of natural gas at the i-th initial pressure regulating station, in kg / kmol. Let be the molar gas constant of the i-th initial pressure regulating station, in kJ / (kmol·K), and its calculation formula is: R k These are the gas constants of the components in natural gas. Let be the average pressure ratio of the i-th candidate pressure regulating station. This represents the average percentage of each component in natural gas.

[0100] By natural gas ratio The analytical expression shows that changes in factors such as ambient temperature, system pressure, and temperature will affect natural gas. The increased input pressure of high-pressure natural gas will have an impact, causing the natural gas... Increase; similarly, a decrease in the output pressure of low-pressure natural gas will also increase the pressure of natural gas. To clarify the thermodynamic energy value of high-pressure natural gas, natural gas data from each station at each time point were analyzed to examine the physical properties of natural gas. The calculation.

[0101] The operational data also includes the density of pure methane, based on specific mass. The density ρ of pure methane after pretreatment at N1 candidate pressure regulating stations i and the average natural gas flow rate after pretreatment at the i-th candidate pressure regulating station. Through the third preset formula The physical properties of the natural gas at the i-th initial pressure regulating station can then be calculated.

[0102] By analogy, the physical properties of natural gas at each initial pressure regulating station can be calculated.

[0103] Step S50, based on the operating coefficient and the physical properties of the natural gas And an economic mathematical model, selecting a preset number of target voltage regulating stations from N2 initial voltage regulating stations.

[0104] In some specific embodiments, reference is made to Figure 3 , Figure 3 for Figure 1 A detailed flowchart of step S50. (See attached diagram.) Figure 3 As shown, step S50 includes:

[0105] Step S501, based on the operating coefficient and the physical properties of the natural gas And an economic mathematical model to determine the optimal installed capacity for each initial voltage regulation station;

[0106] In this embodiment, an economic estimate is required during the screening process to assess the financial feasibility of implementing a power generation system at the selected pressure regulation point.

[0107] First, based on the operating coefficient and the physical properties of the natural gas... And an economic mathematical model is used to determine the optimal installed capacity for each initial voltage regulation station. Specifically: refer to Figure 4 , Figure 4 This is a schematic diagram of a typical structure for natural gas differential pressure power generation. (Example:) Figure 4 As shown, a pressure regulating model using a parallel connection of a JT valve and an expander is employed, divided into two branches. Ball valves 1 and 2 (i.e., 211 and 212) regulate the pressure of the inlet high-pressure natural gas. In the expander branch, pressure regulating valve 1 flexibly adjusts the pressure entering expander 201, ensuring stable expansion operation. Simultaneously, a pressure regulating valve at the outlet further ensures the stability of the outlet low-pressure natural gas, guaranteeing that the outlet pressure matches that of the JT valve 202 branch, avoiding the dangers caused by unequal mixing pressures. Both branches are equipped with preheating devices (preheating device 1 and preheating device 2) to prevent the risk of excessively low temperatures at the outlet.

[0108] Figure 4 This is a typical framework for natural gas differential pressure power generation, applicable to the vast majority of sites. The differential pressure power generation technology involved in this method is not limited to... Figure 4 In the model, the expander branch can be adjusted according to the actual situation, or other processes can be used for parallel replacement. As long as it is a "diversion-preheating-pressure regulation" or "diversion-pressure regulation-heating" method, it belongs to... Figure 4 The frame shown.

[0109] like Figure 4 If the framework shown is not applicable to voltage regulating stations, then the installed capacity should be determined as twice the rated power of the voltage regulating station's differential pressure generation. If Figure 4 The framework illustrated applies to voltage regulating sites. To ensure maximum economic benefits, optimizing installed capacity is crucial for ensuring efficient resource utilization and maximizing the power generation potential of voltage regulating sites. By determining the optimal installed capacity, the highest possible energy output can be achieved while minimizing costs and maximizing the overall economic return of the power generation project.

[0110] For the i-th initial pressure regulating station, assuming the lifespan of the differential pressure power generation system at the i-th initial pressure regulating station is Y years, and taking Y = 20, the economic annual benefit of natural gas differential pressure power generation is:

[0111]

[0112] In the formula, C 1,i The annual economic revenue from generating electricity from the natural gas pressure differential at the i-th initial pressure regulating station is expressed in yuan / year; i The electricity price at the i-th initial voltage regulating station, in yuan / kW·h; ζ i Let be the operating coefficient of the i-th initial voltage regulating station. Let be the installed capacity of the i-th initial voltage regulating station, in kW, and

[0113] Operating costs are:

[0114]

[0115] In the formula, ε i The gas price at the i-th initial pressure regulating station, in yuan / m³. 3 ; The required natural gas volumetric flow rate for the differential pressure power generation system at the i-th initial pressure regulating station, in m³. 3 / s, η EX The thermal efficiency of the heat exchanger at the pressure regulating station is determined based on the manufacturer's model. LHV represents the lower calorific value of natural gas, and P... i Let P be the rated power of natural gas pressure differential power generation at the i-th initial pressure regulating station. i =η e η g Ex i Ex i For the physical properties of natural gas at the i-th initial pressure regulating station η e For the expander efficiency, η g For generator efficiency, The volumetric flow rate of natural gas required for preheating at the i-th initial pressure regulating station via the JT valve is expressed in m³. 3 / s.

[0116] Heat exchanger purchase cost In the formula, AHE is the heat exchange area, which is determined according to the manufacturer and model, and the unit is m. 3 .

[0117] Expander purchase cost

[0118] The objective function of the economic mathematical model is: C * =minC=C 2,i +C 3,i +C 4,i -C 1,iThat is, by substituting each installed capacity within the range into the above formula, the installed capacity corresponding to the minimum cost is determined as the optimal installed capacity for the i-th initial voltage regulating station. This process is repeated to calculate the optimal installed capacity for each initial voltage regulating station.

[0119] Step S502: Based on the lifespan of the natural gas differential pressure power generation system at the optimal installed capacity, the annual economic benefit of natural gas differential pressure power generation, operating costs, heat exchanger costs, and expander costs of each initial pressure regulating station, calculate the investment payback period for each initial pressure regulating station.

[0120] In this embodiment, a comprehensive analysis is further conducted based on the optimization results of the installed capacity of each initial voltage regulating station to gain a deeper understanding of the financial feasibility and profitability of the selected voltage regulating stations, thereby making better decisions and promoting effective resource allocation. The payback period of each initial voltage regulating station under the optimal installed capacity is used to measure economic efficiency.

[0121] Specifically, for the i-th initial pressure regulating station, the lifespan of the natural gas differential pressure power generation system at the i-th initial pressure regulating station under the optimal installed capacity, the annual revenue from natural gas differential pressure power generation, the operating cost, the heat exchanger cost, and the expander cost are substituted into the formula. The payback period for the i-th initial voltage regulation station is calculated.

[0122] In the formula, Let $\frac{i}{i}$ be the annual economic benefit of natural gas pressure differential power generation at the optimal installed capacity for the $i$-th initial pressure regulating station. Let i be the operating cost of the i-th initial voltage regulating station under the optimal installed capacity. Let $\frac{i}{i}$ be the heat exchanger purchase cost for the $i$-th initial pressure regulating station under the optimal installed capacity. Let $\frac{i}{i}$ be the cost of purchasing the expander at the optimal installed capacity for the i-th initial voltage regulating station.

[0123] By analogy, the payback period for each initial voltage regulation station can be calculated.

[0124] Step S503: Select the shortest preset number of initial voltage regulating stations from the investment payback period of each initial voltage regulating station as target voltage regulating stations.

[0125] In this embodiment, a predetermined number of initial voltage regulating stations with the shortest payback periods from N2 initial voltage regulating stations are selected as target voltage regulating stations. These predetermined number of target voltage regulating stations are the most suitable voltage regulating stations for power generation. The selection methods include: using the `min()` function to select the predetermined number of initial voltage regulating stations with the shortest payback periods as target voltage regulating stations; or, sorting the N2 initial voltage regulating stations by their payback periods from smallest to largest and selecting the first predetermined number of initial voltage regulating stations as target voltage regulating stations; or, sorting the N2 initial voltage regulating stations by their payback periods from largest to smallest and selecting the last predetermined number of initial voltage regulating stations as target voltage regulating stations. Optimizing voltage regulating stations from the perspective of optimal installed capacity ensures the accuracy of the method, improves the energy utilization rate of the power generation industry, and reduces carbon emissions.

[0126] In this embodiment, preprocessed operational data of N1 candidate pressure regulating stations is acquired; based on the preprocessed operational data, the operational coefficient of each candidate pressure regulating station is calculated; based on the preprocessed operational data, N2 initial pressure regulating stations are selected from the N1 candidate pressure regulating stations; and the physical properties of natural gas at each initial pressure regulating station are calculated. Based on the operating coefficient and the physical properties of the natural gas An economic mathematical model is used to select a predetermined number of target pressure regulating stations from N2 initial pressure regulating stations. By considering the inlet pressure range, pressure and flow stability, pressure ratio range, and economic operation data, and optimizing the pressure regulating stations from the perspective of optimal installed capacity, the accuracy of the method is ensured, the energy utilization rate of the power generation industry is improved, and carbon emissions are reduced. This embodiment solves the technical problem in related technologies of being unable to accurately select suitable pressure regulating stations for power generation.

[0127] Secondly, embodiments of the present invention also provide a differential pressure power generation voltage regulation site selection device.

[0128] In one embodiment, reference is made to Figure 5 , Figure 5 This is a functional module diagram of an embodiment of the differential pressure power generation voltage regulation site selection device of the present invention. Figure 5 As shown, the differential pressure power generation voltage regulation site selection device includes:

[0129] Information acquisition module 10 is configured to acquire preprocessed operating data of N1 candidate voltage regulation stations;

[0130] The first calculation module 20 is configured to calculate the operating coefficient of each candidate voltage regulation station based on the preprocessed operating data.

[0131] The first selection module 30 is configured to select N2 initial voltage regulation stations from N1 candidate voltage regulation stations based on the preprocessed operating data.

[0132] The second calculation module 40 is configured to calculate the physical properties of natural gas at each initial pressure regulating station.

[0133] The second selection module 50 is configured to select based on the operating coefficient and the physical properties of the natural gas. And an economic mathematical model, selecting a preset number of target voltage regulating stations from N2 initial voltage regulating stations.

[0134] Optionally, in one embodiment, the information acquisition module 10 is configured to:

[0135] Obtain the preprocessed operational data of N1 candidate voltage regulation stations;

[0136] Based on the preprocessed operating data, the operating coefficient of each candidate voltage regulation station is calculated;

[0137] Based on the preprocessed operating data, N2 initial voltage regulating stations are selected from N1 candidate voltage regulating stations;

[0138] Calculate the physical properties of natural gas at each initial pressure regulating station.

[0139] Based on the operating coefficient and the physical properties of the natural gas And an economic mathematical model, selecting a preset number of target voltage regulating stations from N2 initial voltage regulating stations.

[0140] Optionally, in one embodiment, the first computing module 20 is configured to:

[0141] For the i-th candidate pressure regulating station, the actual volumetric flow rate of natural gas after pretreatment at the i-th candidate pressure regulating station is substituted into the first preset formula to calculate the operating coefficient of the i-th candidate pressure regulating station.

[0142] The first preset formula is as follows:

[0143]

[0144] In the formula, Q min,i To support the minimum actual volumetric flow rate of natural gas for differential pressure power generation, For the actual volumetric flow rate of natural gas after pretreatment at N1 candidate pressure regulating stations, |Q> i ∧Q i,t ≥Q min,i The actual volumetric flow rate sequence of natural gas, |Q>i Let |Q> be the actual volumetric flow rate sequence of natural gas for the i-th candidate pressure regulating station within period T. i ={Q i,t |1≤t≤T}, where t is time, T is the data acquisition period, and Q i,t Let T be the actual volumetric flow rate of natural gas at time t for the i-th candidate pressure regulating station. i Let ζ be the data acquisition cycle for the i-th candidate voltage regulation station. i Let be the operating coefficient of the i-th candidate voltage regulating station;

[0145] By analogy, the operating coefficient of each candidate pressure regulating station is calculated.

[0146] Optionally, in one embodiment, the first selection module 30 is configured to:

[0147] Based on the preprocessed operating data, the average inlet pressure, average pressure ratio, and average actual volume flow rate of natural gas for each candidate pressure regulating station are calculated.

[0148] Based on the average pressure ratio and the average actual volume flow rate of natural gas, the coefficient of variation of the pressure ratio and the coefficient of variation of the actual volume flow rate of natural gas for each candidate pressure regulating station are calculated.

[0149] Based on the average inlet pressure, the average pressure ratio, the average actual volumetric flow rate of natural gas, the coefficient of variation of the pressure ratio, and the coefficient of variation of the actual volumetric flow rate of natural gas, N2 initial pressure regulating stations are selected from N1 candidate pressure regulating stations.

[0150] Optionally, in one embodiment, the operating data includes an inlet pressure sequence, an outlet pressure sequence, a natural gas actual volume flow rate sequence, an inlet temperature sequence, and the density of pure methane. The first selection module 30 is further configured to:

[0151] For the i-th candidate pressure regulating station, the average inlet pressure of the i-th candidate pressure regulating station is obtained by dividing the inlet pressure sequence of the i-th candidate pressure regulating station by the data acquisition period T.

[0152] Substituting the preprocessed inlet and outlet pressure sequences of the i-th candidate pressure regulating station per hour within the data acquisition period T into the second preset formula, the average pressure ratio of the i-th candidate pressure regulating station is calculated. The second preset formula is as follows:

[0153]

[0154] In the formula, Let be the average pressure ratio of the i-th candidate pressure regulating station. γ i,tLet be the pressure ratio of the i-th candidate pressure regulating station at time t. Let be the inlet pressure of the i-th candidate pressure regulating station at time t. Let Γ be the outlet pressure of the i-th candidate pressure regulating station at time t. i ={γ i，t 1≤t≤T},|Γ> i Let be the pressure ratio sequence of the i-th candidate pressure regulating station within period T, where T is the data acquisition period;

[0155] The average actual volumetric flow rate of natural gas at the i-th candidate pressure regulating station is obtained by dividing the actual volumetric flow rate sequence of natural gas at the i-th candidate pressure regulating station by the data acquisition period T.

[0156] By analogy, the average inlet pressure, average pressure ratio, and average actual volumetric flow rate of natural gas for each candidate pressure regulating station can be calculated.

[0157] Optionally, in one embodiment, the first selection module 30 is further configured to:

[0158] For the i-th candidate pressure regulating station, calculate the standard deviation of the pressure ratio and the standard deviation of the actual volumetric flow rate of natural gas at the i-th candidate pressure regulating station;

[0159] The absolute value of the quotient of the standard deviation of the pressure ratio of the i-th candidate pressure regulating station divided by the average pressure ratio of the i-th candidate pressure regulating station is used as the coefficient of variation of the pressure ratio of the i-th candidate pressure regulating station.

[0160] The coefficient of variation of the actual volumetric flow rate of natural gas at the i-th candidate pressure regulating station is obtained by dividing the standard deviation of the actual volumetric flow rate of natural gas at the i-th candidate pressure regulating station by the absolute value of the quotient of the average actual volumetric flow rate of natural gas at the i-th candidate pressure regulating station.

[0161] By analogy, the coefficient of variation of the pressure ratio and the coefficient of variation of the actual volumetric flow rate of natural gas for each candidate pressure regulating station can be obtained.

[0162] Optionally, in one embodiment, the first selection module 30 is further configured to:

[0163] From N1 candidate pressure regulating stations, N2 initial pressure regulating stations are determined that meet the selection criteria, wherein the selection criteria are: the average inlet pressure, the average pressure ratio, the average actual natural gas volume flow rate, the coefficient of variation of the pressure ratio, and the coefficient of variation of the actual natural gas volume flow rate are within the corresponding preset ranges.

[0164] Optionally, in one embodiment, the second computing module 40 is configured to:

[0165] Based on the third preset formula, the physical properties of natural gas at each initial pressure regulating station are calculated.

[0166] The third preset formula is as follows:

[0167]

[0168] In the formula, For the actual volumetric flow rate of natural gas after pretreatment at N1 candidate pressure regulating stations, |Q> i ∧Q i,t ≥Q min,i The actual volumetric flow rate sequence of natural gas, Let be the pre-processed natural gas flow rate of the i-th candidate pressure regulating station. Let be the average natural gas flow rate after preprocessing at the i-th candidate pressure regulating station. Let ρ be the pre-processed natural gas flow rate of the i-th candidate pressure regulating station at time t. i Let be the density of the pre-processed natural gas at the i-th candidate pressure regulating station. Natural gas specific mass

[0169] Optionally, in one embodiment, the second selection module 50 is configured to be used for

[0170] Based on the operating coefficient and the physical properties of the natural gas And an economic mathematical model to determine the optimal installed capacity for each initial voltage regulation station;

[0171] Based on the lifespan of the natural gas differential pressure power generation system at the optimal installed capacity, the annual economic benefits of natural gas differential pressure power generation, operating costs, heat exchanger costs, and expander costs of each initial pressure regulating site, the investment payback period of each initial pressure regulating site is calculated.

[0172] From the investment payback period of each initial voltage regulation station, select the preset number of initial voltage regulation stations with the shortest payback period as target voltage regulation stations.

[0173] The functions of each module in the differential pressure power generation and voltage regulation site selection device correspond to the steps in the embodiment of the differential pressure power generation and voltage regulation site selection method. Their functions and implementation processes will not be described in detail here.

[0174] Thirdly, embodiments of the present invention also provide an electronic device, the structure of which is as follows: Figure 6 As shown, it includes: a memory and a processor, wherein the processor is used to read and execute the computer program stored in the memory to implement the aforementioned method for selecting a differential pressure power generation voltage regulation site.

[0175] Fourthly, embodiments of the present invention also provide a computer storage medium storing computer-executable instructions, which, when executed, implement the aforementioned method for selecting a differential pressure power generation voltage regulation station.

[0176] Fifthly, embodiments of the present invention provide a computer program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the differential pressure power generation voltage regulation site selection method embodiments described above, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0177] Finally, it should be noted that while some processes described in the embodiments of the present invention include multiple operations or steps that appear in a specific order, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of the present invention, or may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0178] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for selecting a pressure differential power generation voltage regulating site, the method comprising: determining a pressure differential between a first pressure and a second pressure; and selecting a voltage regulating site based on the determined pressure differential. The method comprises: obtaining preprocessed operation data of N1 candidate pressure regulating stations; based on the preprocessed operation data, calculating the operation coefficient of each candidate pressure regulating station; based on the preprocessed operation data, selecting N2 initial pressure regulating stations from the N1 candidate pressure regulating stations; calculating the physical properties of the natural gas at each initial pressure regulating site based on the operation coefficient, the physical and economic mathematical model, a preset number of target pressure regulating stations are selected from N initial pressure regulating stations.

2. The method of claim 1, wherein, the step of obtaining the preprocessed operation data of the N1 candidate pressure regulating stations comprises: obtaining the operation data of each hour within a data collection period T of the N1 candidate pressure regulating stations; using the box plot method and the linear interpolation method to preprocess the operation data, and obtaining the preprocessed operation data of the N1 candidate pressure regulating stations.

3. The method of claim 1, wherein, The operation data comprises a natural gas actual volume flow sequence, and the step of calculating the operation coefficient of each candidate pressure regulating station based on the preprocessed operation data comprises: for the ith candidate pressure regulating station, substituting the preprocessed natural gas actual volume flow of the ith candidate pressure regulating station into a first preset formula to calculate the operation coefficient of the ith candidate pressure regulating station; The first preset formula is as follows: In the formula, Q min,i is the minimum actual gas volume flow for supporting differential pressure power generation, is the natural gas actual volume flow sequence of the N1 candidate pressure regulating sites that meet the condition |Q i ≥Q i,t ≥Q min,i |Q i is the natural gas actual volume flow sequence of the i-th candidate pressure regulating site in the period T, |Q i ={Q i,t |1≤t≤T} is the time, T is the data acquisition period, Q i,t is the natural gas actual volume flow of the i-th candidate pressure regulating site at time t, T i is the data acquisition period of the i-th candidate pressure regulating site, ζ i is the operation coefficient of the i-th candidate pressure regulating site; By analogy, the operation coefficient of each candidate pressure regulating station is calculated.

4. The method of claim 1, wherein, The step of selecting N2 initial pressure regulating stations from the N1 candidate pressure regulating stations based on the preprocessed operation data comprises: based on the preprocessed operation data, calculating the average import pressure, average pressure ratio and average natural gas actual volume flow of each candidate pressure regulating station; based on the average pressure ratio and the average natural gas actual volume flow, calculating the coefficient of variation of the pressure ratio and the coefficient of variation of the natural gas actual volume flow of each candidate pressure regulating station; based on the average import pressure, the average pressure ratio, the average natural gas actual volume flow, the coefficient of variation of the pressure ratio and the coefficient of variation of the natural gas actual volume flow, selecting N2 initial pressure regulating stations from the N1 candidate pressure regulating stations.

5. The method of claim 4, wherein, The operation data comprises an import pressure sequence, an export pressure sequence, a natural gas actual volume flow sequence and an import temperature sequence, and the step of calculating the average import pressure, average pressure ratio and average natural gas actual volume flow of each candidate pressure regulating station based on the preprocessed operation data comprises: for the ith candidate pressure regulating station, dividing the import pressure sequence of the ith candidate pressure regulating station by the data collection period T to obtain the average import pressure of the ith candidate pressure regulating station; substituting the preprocessed import pressure sequence and export pressure sequence of the ith candidate pressure regulating station within the data collection period T into a second preset formula to calculate the average pressure ratio of the ith candidate pressure regulating station, the second preset formula being as follows: wherein, is the average pressure ratio of the i-th candidate pressure regulating station, γ i,t is the pressure ratio of the i-th candidate pressure regulating station at time t, is the inlet pressure of the i-th candidate pressure regulating station at time t, is the outlet pressure of the i-th candidate pressure regulating station at time t, i = {γ i，t 1≤t≤T}, |Γ i is the pressure ratio sequence of the i-th candidate pressure regulating station in the period T, and T is the data collection period. dividing the natural gas actual volume flow sequence of the ith candidate pressure regulating station by the data collection period T to obtain the average natural gas actual volume flow of the ith candidate pressure regulating station; By analogy, the average import pressure, average pressure ratio and average natural gas actual volume flow of each candidate pressure regulating station are calculated.

6. The method of claim 4, wherein, The step of calculating the variation coefficient of the pressure ratio of each candidate pressure regulating station and the variation coefficient of the actual volume flow of natural gas based on the average pressure ratio and the average actual volume flow of natural gas comprises: For the i-th candidate pressure regulating station, the standard deviation of the pressure ratio of the i-th candidate pressure regulating station and the standard deviation of the actual volume flow of natural gas are calculated; The variation coefficient of the pressure ratio of the i-th candidate pressure regulating station is obtained by dividing the standard deviation of the pressure ratio of the i-th candidate pressure regulating station by the absolute value of the quotient of the average pressure ratio of the i-th candidate pressure regulating station; The variation coefficient of the actual volume flow of natural gas of the i-th candidate pressure regulating station is obtained by dividing the standard deviation of the actual volume flow of natural gas of the i-th candidate pressure regulating station by the absolute value of the quotient of the average actual volume flow of natural gas of the i-th candidate pressure regulating station; In this way, the variation coefficient of the pressure ratio of each candidate pressure regulating station and the variation coefficient of the actual volume flow of natural gas are obtained.

7. The method of claim 4, wherein, The step of selecting N2 initial pressure regulating stations from N1 candidate pressure regulating stations based on the average inlet pressure, the average pressure ratio, the average actual volume flow of natural gas, the variation coefficient of the pressure ratio and the variation coefficient of the actual volume flow of natural gas comprises: N2 initial pressure regulating stations that meet the selection condition are determined from N1 candidate pressure regulating stations, wherein the selection condition is that the average inlet pressure, the average pressure ratio, the average actual volume flow of natural gas, the variation coefficient of the pressure ratio and the variation coefficient of the actual volume flow of natural gas are within corresponding preset ranges.

8. The method of claim 1, wherein, the step of calculating the physical properties of natural gas at each initial pressure regulating site includes: Based on the third preset formula, the physical properties of the natural gas at each initial pressure regulating station are calculated The third preset formula is as follows: wherein, is the actual volume flow of the pretreated natural gas at the N1 candidate pressure regulating sites that satisfies |Q i ∧Q i,t ≥Q min,i is the actual volume flow of the pretreated natural gas at the N1 candidate pressure regulating sites that satisfies |Q is the pretreated natural gas flow at the i-th candidate pressure regulating site, is the average value of the pretreated natural gas flow at the i-th candidate pressure regulating site, is the pretreated natural gas flow at the i-th candidate pressure regulating site at time t, ρ i is the density of pure methane at the i-th candidate pressure regulating site, is the specific mass of the natural gas, 9. The method of claim 1, wherein, The running coefficient, the physical And the economic mathematical model, from the N2 initial pressure regulating stations, select a preset number of target pressure regulating station steps, including: based on the operating coefficient, the physical and economic mathematical model to determine the optimal installed capacity of each initial pressure regulating site; Based on the service life of the natural gas pressure difference power generation system, the economic annual yield of the natural gas pressure difference power generation, the operation cost, the heat exchanger cost and the expander cost of each initial pressure regulating station under the optimal installed capacity, the payback period of each initial pressure regulating station is calculated; The shortest preset number of initial pressure regulating stations are selected from the payback periods of the initial pressure regulating stations as target pressure regulating stations.

10. A differential pressure power generation voltage regulating station site selection apparatus characterized by comprising: The device comprises: An information acquisition module configured to acquire preprocessed operation data of N1 candidate pressure regulating stations; A first calculation module configured to calculate operation coefficients of each candidate pressure regulating station based on the preprocessed operation data; A first selection module configured to select N2 initial pressure regulating stations from N1 candidate pressure regulating stations based on the preprocessed operation data; a second calculation module configured to calculate a physical property of the natural gas at each initial pressure regulating site The second selection module is configured to select based on the operating coefficient and the physical properties of the natural gas. And an economic mathematical model, selecting a preset number of target voltage regulating stations from N2 initial voltage regulating stations.

11. The differential pressure power generation voltage regulation site selection apparatus according to claim 10, characterized by, The first selection module is configured to: Calculate the average inlet pressure, the average pressure ratio and the average actual volume flow of natural gas of each candidate pressure regulating station based on the preprocessed operation data; Calculate the variation coefficient of the pressure ratio of each candidate pressure regulating station and the variation coefficient of the actual volume flow of natural gas based on the average pressure ratio and the average actual volume flow of natural gas; Select N2 initial pressure regulating stations from N1 candidate pressure regulating stations based on the average inlet pressure, the average pressure ratio, the average actual volume flow of natural gas, the variation coefficient of the pressure ratio and the variation coefficient of the actual volume flow of natural gas.

12. The differential pressure power generation voltage regulation site selection apparatus according to claim 10, characterized by, The second selection module is configured to: based on the operating coefficient, the physical and economic mathematical models determine the optimal installed capacity of each initial pressure regulating site; Based on the natural gas pressure difference power generation system life of each initial pressure regulating station under the optimal installed capacity, the natural gas pressure difference power generation annual income, the operation cost, the heat exchanger cost and the expander cost, the investment recovery period of each initial pressure regulating station is calculated; From the investment recovery period of each initial pressure regulating station, the shortest preset number of initial pressure regulating stations are selected as target pressure regulating stations.

13. An electronic device, comprising: Comprise: A memory and a processor; The processor is configured to read and execute a computer program stored in the memory, so as to realize the steps of the pressure difference power generation pressure regulating station selection method in any one of claims 1-9.

14. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions, and the computer executable instructions realize the steps of the pressure difference power generation pressure regulating station selection method in any one of claims 1-9 when executed.

15. A computer program product comprising computer programs / instructions, characterized in that, The computer program / instructions are executed by the processor to realize the steps of the pressure difference power generation pressure regulating station selection method in any one of claims 1-9.

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