Method and device for outputting coal power flexibility transformation scheme of urban load center power grid

Abstract

The invention relates to a method and a device for outputting a coal power flexibility transformation scheme of an urban load center power grid. The method comprises the following steps: determining a to-be-transformed coal power unit from a power system according to the transformation requirements of regions of different levels on the coal power unit; determining the technical transformation direction of the to-be-transformed coal power unit according to the unit type of the to-be-transformed coal power unit; determining a plurality of candidate coal power unit transformation schemes conforming to the technical transformation direction, and determining a target coal power unit transformation scheme from the plurality of candidate coal power unit transformation schemes according to the technical characteristic information and the cost value information of each candidate coal power unit transformation scheme; and adjusting the target coal power unit transformation scheme based on the operation condition and the transformation constraint condition of the to-be-transformed coal power unit, and determining an adjusted coal power unit transformation scheme. By adopting the method, the accuracy of outputting the coal power unit transformation scheme can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of power system optimization, and particularly to a method, device, computer equipment, computer-readable storage medium, and computer program product for outputting a coal-fired power flexibility retrofit plan for an urban load center power grid. Background Art

[0002] With the frequent occurrence of extreme weather phenomena globally in recent years, the problems of randomness, volatility, and intermittency of clean energy have become increasingly prominent. Therefore, relying solely on clean energy to provide electricity at the current stage cannot fully meet the stable power supply of the power grid during peak load periods. During the construction stage of the new power system, with the continuous improvement of the intelligence and electrification levels of residents' lives, each city is also facing the problem of increasing difficulty in clean energy exploitation caused by uneven distribution of clean energy. At the same time, due to the continuous expansion of the gap in system peak shaving and the fact that energy storage technology has not yet reached an ideal level, the load centers of major cities still show a tense power supply situation. Thus, it is necessary to develop flexible resources to ensure the full guarantee of the power grid power supply stability during the construction of the new power system.

[0003] In the current power grid system, coal-fired power units still account for a large proportion and play a crucial role as the main supporting power sources. Moreover, locally constructed coal-fired power units are often closer to urban load centers, are less affected by temperature and voltage fluctuations during power generation, have less power generation loss, and lower peak shaving costs. Therefore, promoting the flexibility retrofit of traditional coal-fired power units helps to ensure the stability of the new power system. Coal-fired power units can serve as flexible resource providers, complement clean energy, achieve more efficient energy allocation and utilization, improve the stability and efficiency of the entire power system, and promote the large-scale use of clean energy.

[0004] In traditional technologies, a suitable retrofit plan for coal-fired power units is mainly output based on the operating conditions of the coal-fired power units themselves. However, the basis for determining such a plan is too single, resulting in a low accuracy of the output retrofit plan for coal-fired power units. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a method, device, computer equipment, computer-readable storage medium, and computer program product for outputting a coal-fired power flexibility retrofit plan for an urban load center power grid, which can improve the accuracy of the output retrofit plan for coal-fired power units.

[0006] In a first aspect, the present application provides a method for outputting a coal-fired power flexibility retrofit plan for an urban load center power grid, including:

[0007] Determine coal-fired power units to be retrofitted from the power system according to the retrofit requirements of coal-fired power units in different levels of regions;

[0008] Determine the technical transformation direction of the coal-fired power generation unit to be transformed according to the unit type of the coal-fired power generation unit to be transformed;

[0009] Determine multiple candidate transformation schemes for coal-fired power generation units that meet the technical transformation direction, and determine the target transformation scheme for coal-fired power generation units from the multiple candidate transformation schemes for coal-fired power generation units according to the technical characteristic information and cost value information of each candidate transformation scheme for coal-fired power generation units;

[0010] Based on the operating conditions and transformation constraint conditions of the coal-fired power generation unit to be transformed, adjust the target transformation scheme for the coal-fired power generation unit to determine the adjusted transformation scheme for the coal-fired power generation unit.

[0011] In one embodiment, the different-level regions include the first-level region and the second-level region, and the administrative division level of the first level is higher than that of the second level; before determining the coal-fired power generation unit to be transformed from the power system according to the transformation requirements of coal-fired power generation units in different-level regions, the method further includes:

[0012] Determine the transformation requirements of different-level regions for coal-fired power generation units according to the power grid peak shaving requirements of the first-level region and the power grid power supply requirements of the second-level region;

[0013] Among them, the power grid peak shaving requirement is used to characterize the power fluctuation regulation ability requirement on the power grid side, and the power grid power supply requirement is used to characterize the power consumption power requirement on the user side.

[0014] In one embodiment, before determining the transformation requirements of different-level regions for coal-fired power generation units according to the power grid peak shaving requirements of the first-level region and the power grid power supply requirements of the second-level region, the method further includes:

[0015] Input the output power data of the power generation equipment in the power system into the power balance model to obtain the system power supply margin; the system power supply margin is used to characterize the difference between the power supply capacity and the power supply demand of the power system at any moment;

[0016] Determine the power grid power supply requirements of the second-level region according to the system power supply margin, the influence of the regions where each coal-fired power generation unit in the power system is located on the stability of the power grid structure, and the disaster resistance guarantee requirements of the regions where each coal-fired power generation unit is located.

[0017] In one embodiment, the power balance model is expressed as:

[0018] ;

[0019] The For the supply margin of the system, the is the output power of non-new energy power generation equipment in the power system; is the output power of photovoltaic power generation equipment in the power system; is the output power of wind power generation equipment in the power system; The is the discharge power of the energy storage system in the power system; The is the charging power of the energy storage system; is the power exchanged with the external network through the tie line, positive for incoming and negative for outgoing; represents a power deficit when represents a power surplus when

[0020] In one embodiment, determining the technical transformation direction of the to-be-transformed coal-fired power generation unit according to the unit type of the to-be-transformed coal-fired power generation unit includes:

[0021] When the unit type of the to-be-transformed coal-fired power generation unit is a condensing unit, determining the technical transformation direction of the to-be-transformed coal-fired power generation unit as the transformation of the boiler side in the condensing unit;

[0022] When the unit type of the to-be-transformed coal-fired power generation unit is a cogeneration unit, determining the technical transformation direction of the to-be-transformed coal-fired power generation unit as the internal transformation of the steam turbine in the cogeneration unit and the external transformation of the thermal power plant in the cogeneration unit.

[0023] In one embodiment, the technical characteristic information includes the unit characteristics, technical usage scenarios, and technical application conditions of the coal-fired power generation unit; the cost value information includes the total life-cycle cost of the coal-fired power generation unit transformation; determining the target coal-fired power generation unit transformation plan from the multiple candidate coal-fired power generation unit transformation plans according to the technical characteristic information and cost value information of each candidate coal-fired power generation unit transformation plan includes:

[0024] Determining the technical comparison information between the candidate coal-fired power generation unit transformation plans according to the unit characteristics, technical usage scenarios, and technical application conditions of each candidate coal-fired power generation unit transformation plan;

[0025] Inputting the total life-cycle cost into the value evaluation model to obtain the peak-shaving adjusted electricity cost;

[0026] Determining the target coal-fired power generation unit transformation plan from the multiple candidate coal-fired power generation unit transformation plans according to the technical comparison information and the peak-shaving adjusted electricity cost;

[0027] Among them, the value evaluation model is expressed as:

[0028] ;

[0029] The is the peak shaving and frequency regulation electricity cost, and the is the total life cycle cost, and the is the total generated electricity of the coal-fired power unit participating in peak shaving during the whole life cycle after transformation.

[0030] In a second aspect, the present application further provides an output device for a coal-fired power flexibility transformation scheme of an urban load center power grid, including:

[0031] A unit determination module, configured to determine coal-fired power units to be transformed from a power system according to the transformation requirements of coal-fired power units in different hierarchical regions;

[0032] A direction determination module, configured to determine the technical transformation direction of the coal-fired power units to be transformed according to the unit types of the coal-fired power units to be transformed;

[0033] A scheme determination module, configured to determine a plurality of candidate coal-fired power unit transformation schemes that meet the technical transformation direction, and determine a target coal-fired power unit transformation scheme from the plurality of candidate coal-fired power unit transformation schemes according to the technical characteristic information and cost value information of each candidate coal-fired power unit transformation scheme;

[0034] An adjustment module, configured to adjust the target coal-fired power unit transformation scheme based on the operating conditions and transformation constraint conditions of the coal-fired power units to be transformed, and determine the adjusted coal-fired power unit transformation scheme.

[0035] In a third aspect, the present application further provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0036] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0037] In a fifth aspect, the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0038] The above-mentioned output method, device, computer equipment, computer-readable storage medium and computer program product for the coal-fired power generation flexibility retrofit plan of the urban load center power grid determine the coal-fired power generation units to be retrofitted from the power system according to the retrofit requirements of coal-fired power generation units in different levels of regions; determine the technical retrofit directions of the coal-fired power generation units to be retrofitted according to the unit types of the coal-fired power generation units to be retrofitted; determine multiple candidate coal-fired power generation unit retrofit plans that meet the technical retrofit directions, and determine the target coal-fired power generation unit retrofit plan from the multiple candidate coal-fired power generation unit retrofit plans according to the technical characteristic information and cost value information of each candidate coal-fired power generation unit retrofit plan; adjust the target coal-fired power generation unit retrofit plan based on the operating conditions and retrofit constraint conditions of the coal-fired power generation units to be retrofitted, and determine the adjusted coal-fired power generation unit retrofit plan. By systematically determining the coal-fired power generation units to be retrofitted according to the retrofit requirements of coal-fired power generation units in different levels of regions and combining the unit types to determine the technical retrofit directions, the pertinence and feasibility of plan selection are ensured; further, by screening multiple candidate coal-fired power generation unit retrofit plans that meet the technical retrofit directions and combining technical characteristics and cost-benefit for optimization, not only the economy of the coal-fired power generation unit retrofit plan is improved, but also its matching degree with the actual operating conditions is enhanced; by adjusting the target coal-fired power generation unit retrofit plan on the basis of considering the operating conditions and retrofit constraint conditions of the coal-fired power generation units, the refinement and dynamic adaptation of the retrofit plan are realized, the accuracy of the output coal-fired power generation unit retrofit plan is significantly improved, which helps to optimize the operating efficiency and stability of the power system, ensure the reliability and efficiency of the new power system in the face of the volatility of clean energy, and promote the reasonable utilization and flexible scheduling of energy. Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0040] Figure 1 It is an application environment diagram of a method for outputting a coal-fired power generation flexibility retrofit plan for an urban load center power grid in an embodiment;

[0041] Figure 2 It is a flowchart of a method for outputting a coal-fired power generation flexibility retrofit plan for an urban load center power grid in an embodiment;

[0042] Figure 3 It is a logic diagram of a method for outputting a coal-fired power generation flexibility retrofit plan for an urban load center power grid in an embodiment;

[0043] Figure 4The structural block diagram of an output device for a coal-fired power flexibility retrofit plan of an urban load center power grid in an embodiment;

[0044] Figure 5 The internal structure diagram of a computer device in an embodiment. Detailed implementation manners

[0045] In order to make the objectives, technical solutions and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] The method for outputting a coal-fired power flexibility retrofit plan of an urban load center power grid provided by an embodiment of the present application can be applied to an application environment as Figure 1 shown. Among them, the terminal 102 communicates with the server 104 through a network. The data storage system can store the data that the server 104 needs to process. The data storage system can be integrated on the server 104, or can be placed in the cloud or on other network servers. The terminal 102 determines the coal-fired power generation units to be retrofitted from the power system according to the retrofit requirements of coal-fired power generation units in different levels of regions; the terminal 102 determines the technical retrofit directions of the coal-fired power generation units to be retrofitted according to the unit types of the coal-fired power generation units to be retrofitted; the terminal 102 determines multiple candidate coal-fired power generation unit retrofit plans that meet the technical retrofit directions, and determines the target coal-fired power generation unit retrofit plan from the multiple candidate coal-fired power generation unit retrofit plans according to the technical characteristic information and cost value information of each candidate coal-fired power generation unit retrofit plan; the terminal 102 adjusts the target coal-fired power generation unit retrofit plan based on the operating conditions and retrofit constraint conditions of the coal-fired power generation units to be retrofitted, and determines the adjusted coal-fired power generation unit retrofit plan. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptop computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things devices can be smart speakers, smart TVs, smart air conditioners, smart in-vehicle devices, projection devices, etc. The portable wearable devices can be smart watches, smart bracelets, head-mounted devices, etc. The head-mounted devices can be virtual reality (VR) devices, augmented reality (AR) devices, smart glasses, etc. The server 104 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0047] In an exemplary embodiment, as Figure 2 shown, a method for outputting a coal-fired power flexibility retrofit plan of an urban load center power grid is provided. Taking the method applied to the Figure 1 terminal 102 as an example, it includes:

[0048] Step S202: Determine the coal-fired power units to be retrofitted from the power system according to the retrofit requirements of coal-fired power units in different-level regions.

[0049] Among them, different-level regions may include multi-dimensional geographical or functional regions divided based on the power grid topology structure and dispatching management authority, and the level differences can be reflected in the priorities of power grid regulation objectives, energy supply and demand characteristics, and technical constraints. For example, the first-level region can be a wide-area scope with the overall stability of the power grid and cross-regional power balance as the core regulation objective (such as provincial / regional power grid); the second-level region can be a local scope with the power supply reliability and power quality of the load center as the core regulation objective (such as municipal power grid or industrial park).

[0050] Among them, the retrofit requirements can be the optimization requirements for the dynamic response characteristics and energy conversion efficiency of coal-fired power units to achieve the stability and flexibility objectives of the new power system. In practical applications, the retrofit requirements can be the mapping of grid function requirements (such as peak shaving and power supply guarantee) to unit technical parameters. Exemplarily, the retrofit requirements can be that the load regulation range and ramp rate of the unit meet the grid power fluctuation suppression requirements, or for another example, it can be that the power supply availability and fault recovery time of the unit under extreme operating conditions meet the reliability threshold of the load center.

[0051] As an example, the retrofit requirements for coal-fired power units can include retrofit requirements centered on the peak shaving capacity on the grid side, such as grid power fluctuation regulation requirements (such as daily peak-valley difference, new energy output ramp rate), and the demand indicators can include peak shaving capacity gap and response speed.

[0052] As another example, the retrofit requirements for coal-fired power units can include retrofit requirements centered on the power supply reliability on the user side, such as the stability of the regional power grid structure (such as power supply margin during grid faults) and disaster resistance guarantee requirements (such as minimum power supply capacity under extreme weather conditions), and the demand indicators can include power supply margin threshold and load recovery time.

[0053] In specific implementation, to determine the coal-fired power units to be retrofitted from the power system according to the retrofit requirements of coal-fired power units in different-level regions, weights can be assigned to the retrofit requirements of coal-fired power units in different-level regions. For example, the provincial peak shaving demand accounts for 60% and the municipal power supply guarantee demand accounts for 40%. A unit retrofit priority scoring model is constructed, and the coal-fired power units to be retrofitted are screened from the power system through the unit retrofit priority scoring model.

[0054] In practical applications, it is preferable to select units with insufficient peak shaving capacity and units that are bottlenecks in ensuring power supply as the coal-fired power generation units to be retrofitted. Units with insufficient peak shaving capacity can refer to those that cannot meet the power grid regulation requirements in scenarios with a high penetration rate of new energy. Units that are bottlenecks in ensuring power supply can refer to those whose power supply margin continuously falls below the safety threshold during peak load or power grid failures.

[0055] Step S204: Determine the technical transformation direction of the coal-fired power generation units to be retrofitted according to the unit type of the coal-fired power generation units to be retrofitted.

[0056] Among them, the unit type of the coal-fired power generation units to be retrofitted can refer to the functional classification of coal-fired power generation units based on the form of energy output.

[0057] In specific implementations, the unit types can include condensing units and combined heat and power (CHP) units. Condensing units can be units that achieve a single electrical energy output only through a condensing thermal cycle. Their technical bottlenecks lie in the thermal efficiency decay and dynamic response lag under low-load conditions. CHP units can be units that achieve combined heat and power supply through extraction or backpressure thermal cycles. Their technical bottlenecks lie in the limited peak shaving freedom caused by strong heat-electric coupling.

[0058] Among them, the technical transformation direction can be a systematic technical optimization path proposed in combination with grid requirements for the inherent technical bottlenecks of the unit type. The technical transformation direction can also be called a technical route.

[0059] In practical applications, the technical transformation direction of condensing units can be to improve the rapid load-changing ability on the boiler side, such as improving Automatic Generation Control (AGC). The technical transformation direction of CHP units can be to balance the degree of heat-electric decoupling and heat supply economy, such as the matching degree between the heat storage capacity and the heat supply load curve.

[0060] Step S206: Determine multiple candidate retrofit schemes for coal-fired power generation units that meet the technical transformation direction, and determine the target retrofit scheme for coal-fired power generation units from the multiple candidate retrofit schemes according to the technical characteristic information and cost value information of each candidate retrofit scheme for coal-fired power generation units.

[0061] Among them, the multiple candidate retrofit schemes for coal-fired power generation units can be a set of feasible technical paths generated based on the technical transformation direction. The candidate retrofit scheme for a coal-fired power generation unit can be a set of technical schemes under the constraints of the unit's body structure (such as the boiler pressure-bearing capacity and the steam turbine flow area) and grid regulation requirements (such as the peak shaving rate and power supply margin), or a set of feasible schemes under the preset cost threshold and resource limitations (such as the construction period and material availability).

[0062] Among them, the technical characteristic information may include the optimization ability of the candidate coal-fired power unit retrofit plan for the core performance parameters of the unit, such as some technical performance indicators like peak shaving depth (load rate range), ramp rate, and change in thermal efficiency.

[0063] Among them, the cost value information may include the economic quantification data within the entire life cycle of the retrofit plan, such as equipment procurement cost, operation and maintenance cost, salvage recovery rate, peak shaving compensation income, carbon emission rights trading income, penalty losses reduced due to improved power supply reliability, and sunk costs caused by technical failures.

[0064] Optionally, the technical characteristic information and the cost value information can be converted into unified quantification indicators, and different weights can be assigned to each of them. Then, through a fuzzy mathematics model (such as applying fuzzy matrix compound operation), the result of the comprehensive score can be obtained, so as to determine the target coal-fired power unit retrofit plan with the highest comprehensive score from multiple candidate coal-fired power unit retrofit plans.

[0065] Step S208: Based on the operating conditions and retrofit constraint conditions of the coal-fired power unit to be retrofitted, adjust the target coal-fired power unit retrofit plan to determine the adjusted coal-fired power unit retrofit plan.

[0066] In specific implementation, after determining the target coal-fired power unit retrofit plan, the target coal-fired power unit retrofit plan can be adjusted to obtain the adjusted coal-fired power unit retrofit plan with the highest feasibility and strongest operability.

[0067] Among them, the operating state may include the operating conditions and attributes of the unit, such as the commissioning / decommissioning status of the unit, rated installed capacity, grid connection voltage level, and other retrofits that have been completed. Exemplarily, the operating state may also include the current thermo-electricity coupling operating parameters and equipment health status of the unit, such as dynamic performance parameters like real-time load rate, peak shaving response rate, thermal efficiency, and emission indicators, or equipment health data such as the remaining life of key components (such as boiler heating surfaces and steam turbine blades), fatigue damage accumulation rate, and historical failure frequency, or operating constraints such as grid dispatching instruction matching degree and unit safe operating boundary.

[0068] Among them, the retrofit constraint conditions may include multi-dimensional limiting conditions that affect the implementation feasibility of the retrofit plan, such as the available space and investment budget of the power plant. Exemplarily, the retrofit constraint conditions may also include resource constraints such as the upper limit of the retrofit budget, construction period limit, and reliability of the material / equipment supply chain, or technical constraints such as equipment body structure compatibility and control system upgrade ability, or external constraints such as environmental protection regulations.

[0069] In specific implementation, adjusting the retrofit plan for the target coal-fired power unit may refer to iteratively correcting the target plan through a dynamic optimization model based on real-time data and constraint conditions. For example, comparing the operation status monitoring data with the preset threshold to trigger the online adjustment of plan parameters (such as retrofit scale and technical path); or, under the retrofit constraint conditions, rebalancing the technical performance and economy to generate the optimal technical plan. The finally output adjusted retrofit plan for the coal-fired power unit may refer to the final implementation plan that meets the dynamic feasibility, technical compatibility, and economic constraints.

[0070] In the above method for outputting the coal-fired power flexibility retrofit plan of the urban load center power grid, according to the retrofit requirements of coal-fired power units in different hierarchical regions, the coal-fired power units to be retrofitted are determined from the power system; according to the unit types of the coal-fired power units to be retrofitted, the technical retrofit directions of the coal-fired power units to be retrofitted are determined; multiple candidate retrofit plans for the coal-fired power units are determined that meet the technical retrofit directions, and based on the technical characteristic information and cost value information of each candidate retrofit plan for the coal-fired power units, the target retrofit plan for the coal-fired power units is determined from the multiple candidate retrofit plans for the coal-fired power units; based on the operation status and retrofit constraint conditions of the coal-fired power units to be retrofitted, the target retrofit plan for the coal-fired power units is adjusted to determine the adjusted retrofit plan for the coal-fired power units. By systematically determining the coal-fired power units to be retrofitted according to the retrofit requirements of coal-fired power units in different hierarchical regions and determining the technical retrofit directions in combination with the unit types, the pertinence and feasibility of the plan selection are ensured; further, by screening multiple candidate retrofit plans for the coal-fired power units that meet the technical retrofit directions and optimizing them in combination with technical characteristics and cost benefits, not only the economy of the retrofit plan for the coal-fired power units is improved, but also its matching degree with the actual operation status is enhanced; on the basis of considering the operation status and retrofit constraint conditions of the coal-fired power units, the target retrofit plan for the coal-fired power units is adjusted, realizing the refinement and dynamic adaptation of the retrofit plan, significantly improving the accuracy of the output retrofit plan for the coal-fired power units, helping to optimize the operation efficiency and stability of the power system, ensuring the reliability and high efficiency of the new power system in the face of the volatility of clean energy, and promoting the rational utilization and flexible scheduling of energy.

[0071] In another embodiment, the different hierarchical regions include the first-level region and the second-level region, and the administrative division level of the first level is higher than that of the second level; before determining the coal-fired power units to be retrofitted from the power system according to the retrofit requirements of coal-fired power units in different hierarchical regions, it further includes: determining the retrofit requirements of different hierarchical regions for coal-fired power units according to the power grid peak shaving requirements of the first-level region and the power grid power supply requirements of the second-level region; wherein, the power grid peak shaving requirements are used to characterize the power fluctuation regulation ability requirements on the power grid side, and the power grid power supply requirements are used to characterize the power consumption power requirements on the user side.

[0072] In specific implementation, the first-level region may include national-level regions and provincial-level regions.

[0073] Exemplarily, the power grid peak shaving demand of the national-level region may refer to exploring the deep peak shaving of coal-fired power units in areas with a high proportion of new energy and insufficient peak shaving capacity, with the minimum power generation output reaching below 30% of the rated load on the premise of ensuring safety. Moreover, for the flexibility transformation of existing coal-fired power units, it is necessary to "transform all that should be transformed" and strive to complete the flexibility transformation task of coal-fired power units to maximize or optimize the transformation task, and make up for the randomness and volatility problems of new energy (wind power, photovoltaic) through deep coal power peak shaving to ensure the stability of the new power system.

[0074] In addition, at the provincial power grid level, to ensure the balance between system supply and demand, it may be necessary to curtail clean energy such as wind power and solar power to participate in system peak shaving. The curtailment of electricity due to insufficient system peak shaving capacity is one of the reasons restricting the consumption of new energy in the provincial power grid. During holidays, affected by low valley loads, the transition period of power grid construction, and the seasonal large-scale generation of new energy, the provincial power grid often experiences curtailment of new energy caused by peak shaving constraints, transmission section constraints, and insufficient system regulation margin (including regulation space and regulation speed), and the power grid transmission capacity and new energy consumption face huge challenges. Therefore, exploring the flexibility regulation resources in all links of the power system, namely the source-grid-load-storage, and improving the system peak shaving capacity are the power grid peak shaving demands at the provincial-level region. Moreover, if comparing the unit power generation costs of various paid peak shaving methods in the provincial power grid, among various peak shaving methods such as deep coal power peak shaving, gas power start-stop, pumped-storage pumping, hydropower water waste, wind power curtailment, and nuclear power output regulation for peak shaving, deep coal power peak shaving has the greatest cost advantage. Therefore, it is very important to carry out flexibility transformation on coal power.

[0075] In specific implementation, the second-level region may include urban-level regions.

[0076] Exemplarily, the power grid power supply demand of the urban-level region may refer to the demand for safe and stable power supply. Optionally, the power grid power supply demand of the urban-level region may include the power supply demand for the core load area, the demand for the system's safe and stable support ability, and the demand for regional disaster resistance and guarantee.

[0077] In specific implementation, the power supply demand for the core load area is due to the large load in the core area, and a reliable power supply source is required. If the transformation period of coal-fired power units in the area is long, the local power supply capacity may be insufficient during the transformation period. Therefore, a power balance model can be introduced to conduct power balance analysis on the urban load center to determine the system power supply margin; among them, the system power supply margin is used to quantify the difference between the real-time power supply capacity and the load demand of the power system and identify potential power supply gaps.

[0078] The demand for the system's safe and stable support capacity is due to the continuous development of new energy and the continuous deepening of the AC / DC hybrid power grid pattern. The power grids in the receiving-end load centers are often closely interconnected, making short-circuit problems prone to occur. If the retrofitted coal-fired power units are located in weak stability areas, their overhaul and retrofit may affect the regional grid structure and voltage support capacity, bringing safety and stability problems.

[0079] The demand for disaster resistance and guarantee in the region is due to the high risk of natural gas supply in the event of major accidents or natural disasters, which may affect the operation of gas-fired power units and bring the risk of power supply in the area not being restored. Compared with gas-fired power units, the coal supply and storage of coal-fired power units are relatively reliable, making them ideal power sources for disaster resistance and guarantee. However, during the flexibility retrofit of coal-fired power units, if major accidents or natural disasters occur in the system, it will also increase the difficulty of disaster resistance and guarantee. Therefore, to ensure the reliability of the disaster resistance and guarantee capabilities of each area of the provincial power grid, in combination with the disaster resistance and guarantee requirements of each region, before the newly built gas-powered black start power source is put into production or in areas with high gas supply risks during major accidents, the retrofit of existing coal-fired power units can be delayed or they can be kept in operation until retirement.

[0080] In specific implementation, the grid peak shaving demand of the first-level region and the grid power supply demand of the second-level region can be integrated into a comprehensive retrofit demand to obtain the total retrofit demand for coal-fired power units in different-level regions, thereby screening out the coal-fired power units to be retrofitted. Or, the grid peak shaving demand of the first-level region and the grid power supply demand of the second-level region can be quantified into numerical indicators, different weights are assigned, and the total retrofit demand for coal-fired power units in different-level regions is comprehensively obtained, thereby screening out the coal-fired power units to be retrofitted.

[0081] The technical solution of this embodiment dynamically integrates the grid peak shaving demand on the grid side and the power supply demand on the user side through a multi-level regional demand collaborative analysis mechanism, realizing the accurate quantification and priority ranking of the retrofit demand for coal-fired power units.

[0082] In another embodiment, before determining the retrofit demand for coal-fired power units in different-level regions according to the grid peak shaving demand of the first-level region and the grid power supply demand of the second-level region, it further includes: inputting the output power data of the power generation equipment in the power system into a power balance model to obtain the system power supply margin; the system power supply margin is used to represent the difference between the power supply capacity and the power supply demand of the power system at any moment; according to the system power supply margin, the impact of the regions where each coal-fired power unit in the power system is located on the stability of the grid structure, and the disaster resistance and guarantee requirements of the regions where each coal-fired power unit is located, the grid power supply demand of the second-level region is determined.

[0083] Among them, the system supply margin is used to quantify the difference between the real-time power supply capacity of the power system and the load demand, and identify potential power supply gaps. The load demand may include the maximum social electricity consumption load and reserve capacity demand of each region. When the system supply margin is positive, it indicates a power supply surplus; when the system supply margin is negative, it indicates a power supply gap.

[0084] The power balance model can be a mathematical model used to simulate and optimize the dynamic matching relationship among power generation, power transmission, and power consumption in the power system. Optionally, the power balance model can generate the supply margin curve of each region through time series simulation, and identify the power supply shortage periods, that is, the situations where the system supply margin is negative.

[0085] Among them, the output power data of power generation equipment may include conventional power sources (coal-fired power, gas-fired power), new energy (photovoltaic, wind power), energy storage systems (charge and discharge power), external tie line exchange power, etc.

[0086] Among them, the system supply margin can be used to analyze the scale and time period distribution of power supply gaps (such as peak load periods, periods of large-scale new energy generation). Specific indicators may include the negative duration of the system supply margin and the maximum gap power, etc.

[0087] Among them, the impact on the stability of the power grid structure can be used to analyze the impact of coal-fired power unit transformation on the short-circuit capacity and voltage support ability of the regional power grid. Specific indicators may include the short-circuit ratio, voltage stability margin, etc.

[0088] Among them, the disaster resistance guarantee demand can be used to analyze the black start ability and fuel supply reliability of coal-fired power units in extreme disasters (such as typhoons, earthquakes). Specific indicators may include the proportion of black start power source configuration, the number of days of coal reserves, the gas-fired power dependence, etc.

[0089] In specific implementation, according to the system supply margin, the impact of the power grid structure stability of each coal-fired power unit in the power system on the region to which it belongs, and the disaster resistance guarantee demand of the region to which each coal-fired power unit belongs, the power grid power supply demand of the second-level region can be determined. Exemplarily, if the system supply margin of a certain region is long-term negative and the gap is large, power supply capacity can be preferentially guaranteed, and the centralized transformation of coal-fired power units in this region can be restricted; if a certain coal-fired power unit is located in a weak power grid area (such as low short-circuit capacity, insufficient voltage support), the transformation of the coal-fired power unit in this region can be postponed; if a certain coal-fired power unit is located in a region where the black start power source of gas-fired power has not been put into production or the gas source supply risk is high, the coal-fired power unit in this region can be reserved as a disaster resistance guarantee power source, and the transformation of the coal-fired power unit in this region can be postponed. Thus, after determining the power grid power supply demand of the second-level region, integrating the power grid peak shaving demand of the first-level region, the coal-fired power units to be transformed can be comprehensively determined.

[0090] The technical solution of this embodiment is based on the determination of the retrofit requirements of coal-fired power units through a power balance model and multi-dimensional demand analysis. By quantifying the power supply capacity gap, grid structure stability, and disaster resistance guarantee requirements, the power supply demand of the power grid in the second-tier region is accurately defined, thereby providing a scientific basis for subsequent coal power flexibility retrofits.

[0091] In another embodiment, the power balance model is expressed as:

[0092] ;

[0093] is the system reserve margin for power supply, is the output power of non-renewable energy power generation equipment in the power system; is the output power of photovoltaic power generation equipment in the power system; is the output power of wind power generation equipment in the power system; is the discharge power of the energy storage system in the power system; is the charging power of the energy storage system; is the power exchanged with the external network through the tie line, positive for incoming and negative for outgoing; represents a power deficit when represents a power surplus when

[0094] Among them, is the output power of non-renewable energy power generation equipment in the power system, and can also refer to the output of the system's conventional power sources. Conventional power sources can refer to coal-fired power generation, gas-fired power generation, etc. is the output power of photovoltaic power generation equipment in the power system, and can refer to the system's photovoltaic output. is the output power of wind power generation equipment in the power system, and can refer to the system's wind power output.

[0095] In specific implementation, the retrofit of coal-fired power units may have a greater impact on the load power supply in the grid area. Therefore, the peak-shifting retrofit of coal-fired power units in the same area can be carried out in combination with the specific operating conditions of the coal-fired power units. Based on the system reserve margin for power supply output by the power balance model and other factors, the coal-fired power units to be retrofitted are jointly determined.

[0096] In summary, for the flexibility retrofit of coal-fired power units, the overall requirements at the national level and the peak shaving requirements of the provincial power grid can be met first. Under the condition that the balance margin permits, sufficient unit maintenance can be arranged to ensure that "all units that should be retrofitted are retrofitted"; secondly, in combination with the actual operating conditions of the urban power grid and coal-fired power units, considering the possible impacts on power supply, safety stability, and disaster resistance guarantee during the retrofit of units in each region, the retrofit sequence and method of units can be flexibly formulated, and units with conditions and longer service life can be coordinated to ensure that "units that can be retrofitted are retrofitted first". Intentionally retrofitting units can be added to the annual plan in a timely manner, and the maintenance arrangement can be coordinated to ensure that "all units that are willing to be retrofitted are retrofitted".

[0097] In another embodiment, according to the unit type of the coal-fired power generation unit to be retrofitted, the technical retrofit direction of the coal-fired power generation unit to be retrofitted is determined, including: when the unit type of the coal-fired power generation unit to be retrofitted is a condensing unit, the technical retrofit direction of the coal-fired power generation unit to be retrofitted is determined as the retrofit of the boiler side in the condensing unit; when the unit type of the coal-fired power generation unit to be retrofitted is a cogeneration unit, the technical retrofit direction of the coal-fired power generation unit to be retrofitted is determined as the internal retrofit of the steam turbine in the cogeneration unit and the external retrofit of the thermal power plant in the cogeneration unit.

[0098] In practical applications, appropriate technical routes need to be selected for the flexibility retrofit of different types of coal-fired power generation units, that is, appropriate technical retrofit directions are selected. The flexibility retrofit of coal-fired power generation units can be divided into the retrofit of condensing units and the retrofit of cogeneration units. Among them, the retrofit of condensing units has a greater peak shaving depth, while the "power determined by heat" characteristic of cogeneration units limits the peak shaving depth.

[0099] In specific implementation, for condensing units, the retrofit goal is to achieve deep peak shaving, fast start-stop and fast ramping, and the main retrofits are the boiler and the denitration device. The key to the retrofit is to solve problems such as stable combustion of the boiler under low load conditions and the operation of the denitration device under low load conditions, specifically including the optimization retrofit of the coal pulverizing system, low-load stable combustion technology, wide-load denitration technology, etc. Therefore, the technical retrofit direction of condensing units includes the retrofit of the boiler side, including the optimization retrofit of the coal pulverizing system, low-load stable combustion, wide-load denitration, etc.

[0100] In specific implementation, for cogeneration units, the retrofit goal is to achieve thermal power decoupling, ensure the improvement of peak shaving capacity while providing heat, and the main retrofits are the steam turbine or adding heat storage tanks / electrode boilers, etc. Using other heat sources to replace the steam turbine for heating can reduce the minimum output of the unit while meeting the heating demand, thereby improving the flexibility and peak shaving depth of the unit. Therefore, the technical retrofit direction of cogeneration units can include two categories. One is the internal retrofit of the steam turbine in the unit, specifically including technologies such as steam turbine bypass heating and removing the low-pressure cylinder; the other is the external retrofit of the thermal power plant in the unit, specifically including technologies such as adding hot water / molten salt heat storage, heat pump / electrode boiler heating, etc.

[0101] The technical solution of this embodiment can accurately improve the flexibility of the unit, adapt to the requirements of the new power system, reduce the retrofit cost, avoid waste of resources, and promote multi-energy complementarity and system coordination by formulating retrofit directions for the different characteristics of condensing units and cogeneration units through differentiated technical retrofit paths.

[0102] In another embodiment, the technical characteristic information includes the unit characteristics, technical usage scenarios, and technical application conditions of coal-fired power generation units; the cost value information includes the total life-cycle cost of the transformation of coal-fired power generation units; determining the target coal-fired power generation unit transformation plan from multiple candidate coal-fired power generation unit transformation plans according to the technical characteristic information and cost value information of each candidate coal-fired power generation unit transformation plan includes:

[0103] Determining the technical comparison information between each candidate coal-fired power generation unit transformation plan according to the unit characteristics, technical usage scenarios, and technical application conditions of each candidate coal-fired power generation unit transformation plan; inputting the total life-cycle cost into the value evaluation model to obtain the peak shaving electricity cost per unit; determining the target coal-fired power generation unit transformation plan from multiple candidate coal-fired power generation unit transformation plans according to the technical comparison information and the peak shaving electricity cost per unit;

[0104] Among them, the value evaluation model is expressed as:

[0105] ;

[0106] is the peak shaving electricity cost per unit, is the total life-cycle cost, is the total generated electricity of the coal-fired power generation unit participating in peak shaving during the whole life cycle after the transformation of the coal-fired power generation unit.

[0107] In specific implementation, technical analysis and comparison can be carried out on multiple candidate coal-fired power generation unit transformation plans under the technical transformation direction, and this process can involve comparisons in aspects such as advantages and disadvantages analysis, applicable scenarios, and application conditions.

[0108] Among them, the unit characteristics of the coal-fired power generation unit transformation plan can include the operating economy of the unit after transformation, the degree of transformation of the original system, the impact on the unit life, the operating flexibility of the unit, the energy conversion efficiency, the floor area, the initial investment value of the transformation, etc.

[0109] Among them, the technical usage scenarios can include the technical types applicable to the unit, the unit capacity, etc.

[0110] Among them, the technical application conditions can include the site required for technical application, the performance transformation of the unit itself, etc.

[0111] In specific implementation, comparative analysis can be carried out on the unit characteristics, technical usage scenarios, and technical application conditions of each candidate coal-fired power generation unit transformation plan, and the technical comparison information between each candidate coal-fired power generation unit transformation plan can be determined. Optionally, the technical comparison information can include the scoring and ranking of the candidate coal-fired power generation unit transformation plan. The higher the score, the more the unit characteristics, technical usage scenarios, and technical application conditions corresponding to the transformation plan meet the transformation requirements.

[0112] Exemplarily, assume that the unit type of the coal-fired power generation unit to be retrofitted is a cogeneration unit, and there are three candidate coal-fired power generation unit retrofit schemes, namely unit technical retrofit, molten salt energy storage technology, and new electrode steam boiler scheme.

[0113] Among them, unit technical retrofit means that the cogeneration unit realizes thermoelectric decoupling by retrofitting the internal system of the steam turbine. The main technologies include removing the low-pressure cylinder, high back-pressure heating, steam turbine bypass heating, and absorption heat pump, etc. Among them, the investment in the operation scheme of removing the low-pressure cylinder inlet steam is small, and it can achieve deep peak shaving, with good economy. Therefore, the removal of the low-pressure cylinder can be selected as the target coal-fired power generation unit retrofit scheme. The core of the cylinder removal retrofit lies in adding a low-pressure cylinder inlet steam adjustment bypass on the premise that the low-pressure cylinder body remains unchanged, so as to maintain a relatively low inlet steam flow rate in the low-pressure cylinder and be able to flexibly adjust the inlet steam flow rate of the low-pressure cylinder according to the load change. An auxiliary vacuum extraction device is added to maintain an ultra-low back pressure, and the extraction steam is utilized for heating to the greatest extent, with strong low-load peak shaving ability. This technology has the advantages of low investment, flexible operation mode, and good heating efficiency, and is applicable to wet-cooled and air-cooled units with a capacity of 300 MW and above that supply heat from the middle extraction and have a demand for deep peak shaving.

[0114] Among them, molten salt energy storage can refer to applying the advantages of the heat stability, high specific heat capacity, good chemical stability, and low saturated vapor pressure of media such as molten salt to store heat. These heats can generate high-parameter steam and be reused for power generation or heating. The molten salt energy storage technology can provide reliable moment of inertia and stable voltage ability for the system, and has obvious advantages in terms of installed capacity scale, energy storage density, technical cost, service life, etc., and has the technical conditions, industrial foundation, and scale benefits for large-scale application. At the same time, this technology has a small floor area, high energy storage density, little environmental impact, is not restricted by geographical environment conditions, has no chemical reaction during the charging and discharging process, the technical parameters and process are controllable, and the system has high safety. In addition, the thermal power unit retrofitted with the high-temperature molten salt heat storage technology has high flexibility and fast adjustment speed, can expand a variety of application scenarios, obtain a variety of benefits, and has good economy. For example, participating in auxiliary services such as system deep peak shaving, start-stop peak shaving, and spinning reserve to obtain auxiliary benefits; participating in the electricity spot market trading, storing heat on a large scale with valley electricity and releasing heat during peak electricity to obtain peak-valley electricity price difference benefits. Therefore, the molten salt energy storage technology can also become one of the candidate coal-fired power generation unit retrofit schemes.

[0115] Among them, the electrode boiler technology can refer to the use of electrodes to directly discharge heat in the boiler to generate steam, converting electrical energy into heat energy. When the electrode steam boiler is turned on, the electric energy is converted into the heat of saturated steam, and an electric heating superheater is installed at the saturated steam outlet to heat the saturated steam into superheated steam to meet the end steam supply demand. This technology has the advantages of large heat storage capacity, high equipment stability, and flexible operation mode. However, because it uses high-quality electrical energy for external heating, the loss is large, the energy utilization rate is low, and the heating economy is poor. However, when the proportion of hydropower, nuclear power, photovoltaic power, wind power, etc. in the system power supply is relatively large and the power supply is sufficient, the economy of the electric heating boiler is relatively reasonable. Therefore, the electrode boiler technology can also be one of the candidate transformation schemes for coal-fired power units.

[0116] In specific implementation, the economy of the candidate transformation schemes for coal-fired power units can also be evaluated. The levelized cost of electricity can be used for evaluation. The main purpose of the levelized cost of electricity (the average cost per unit of electricity) is to intuitively and quickly evaluate the benefit situation. If the levelized cost of electricity is lower than the target electricity price, it means that the transformation scheme is more feasible. Therefore, the levelized cost of electricity for peak shaving (LCOE) can be used to evaluate the economy of different candidate transformation schemes for coal-fired power units. The levelized cost of electricity for peak shaving can be the ratio of the total life-cycle cost of the coal-fired power unit transformation to the total generated electricity involved in peak shaving during the whole life cycle after the transformation, and can be used to quantify the economic advantages and disadvantages of the unit peak-shaving electricity of different technology transformation schemes.

[0117] Among them, the total life-cycle cost can include the total cost generated during the entire life cycle of the coal-fired power unit flexibility transformation from initial investment, putting into operation until being declared retired, mainly including: initial investment cost, operation and maintenance cost, retirement residual value, and financial expenses. Among them, the initial investment cost mainly includes: construction engineering cost, equipment purchase cost, installation engineering cost, and other expenses, etc.; the operation and maintenance cost mainly includes component replacement cost, personnel salary, fuel and power cost, and management cost, etc.; the retirement residual value refers to the remaining value of the assets when the coal-fired power unit is declared retired, which can be directly financially liquidated; the financial expenses refer to the interest expenses formed by the long-term loan during the project construction period and the working capital loan during the project operation period.

[0118] Among them, the total generated electricity involved in peak shaving during the whole life cycle after the coal-fired power unit transformation can include the part where the coal-fired power unit actively adjusts its output in response to the grid load fluctuation (such as power supply during peak hours and output reduction during low valley hours).

[0119] Exemplarily, based on the technical comparison information and the cost of peak shaving and frequency regulation electricity, the target coal-fired power unit retrofit plan can be determined from multiple candidate coal-fired power unit retrofit plans. First, according to the technical comparison information, candidate plans that cannot meet the grid retrofit requirements can be excluded. For example, candidate plans that cannot meet the minimum peak shaving depth and the minimum unit output power can be excluded. After excluding the plans that do not meet the scenario requirements or technical limitations according to the technical comparison information, several technically compliant plans are obtained. Then, the plan with the lowest cost of peak shaving and frequency regulation electricity (LCOE) can be selected from the technically compliant plans according to the ascending order of the cost of peak shaving and frequency regulation electricity, as the target coal-fired power unit retrofit plan.

[0120] The technical solution of this embodiment proposes a decision-making framework for coal-fired power unit retrofit based on technical characteristics and economic evaluation, which can screen out technically feasible and cost-optimal retrofit paths from multiple candidate plans.

[0121] For the convenience of understanding by those skilled in the art, Figure 3 Exemplarily, a logic diagram of a method for outputting a coal-fired power flexibility retrofit plan for an urban load center power grid is provided.

[0122] First, comprehensively consider the power peak shaving capacity requirements at the national level, the system peak shaving requirements at the provincial power grid level, and the safety and stability requirements of the urban power grid to determine the coal-fired power flexibility retrofit requirements of the urban power grid. Secondly, combine the unit type and operating characteristics of the coal-fired power unit, the advantages and disadvantages, application conditions and applicable scenarios of the candidate coal-fired power unit retrofit plans, and through comprehensive technical and economic comparisons, gradually determine the technical route (technical retrofit direction), technical plan (target coal-fired power unit retrofit plan), and specific technology (retrofit plan for the adjusted coal-fired power unit). Finally, output a highly targeted and feasible retrofit plan that not only meets the retrofit requirements at the overall power system level but also improves the technical economy of the specific coal-fired power unit flexibility retrofit. In summary, this method comprehensively considers the power peak shaving capacity requirements at the national level, the system peak shaving requirements at the provincial power grid level, and the safe and stable power supply requirements for ensuring power supply in the core load area, system safety and stability support, and regional disaster resistance guarantee at the urban power grid level, finally determines the coal-fired power flexibility retrofit requirements for the urban load center, and then combines the coal-fired power unit type, analysis and comparison of candidate coal-fired power unit retrofit plans, and the operating conditions and retrofit conditions (retrofit constraint conditions) of the unit to be retrofitted, and finally outputs a highly targeted and feasible retrofit plan.

[0123] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the indications of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0124] Based on the same inventive concept, an embodiment of the present application further provides an output device for a coal-fired power flexibility retrofit plan of an urban load center power grid for implementing the method for outputting a coal-fired power flexibility retrofit plan of an urban load center power grid described above. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the output device for a coal-fired power flexibility retrofit plan of an urban load center power grid provided below can refer to the limitations on the method for outputting a coal-fired power flexibility retrofit plan of an urban load center power grid in the above text, and will not be repeated here.

[0125] In an exemplary embodiment, as Figure 4 shown, an output device for a coal-fired power flexibility retrofit plan of an urban load center power grid is provided, including:

[0126] A unit determination module 410, configured to determine coal-fired power units to be retrofitted from a power system according to the retrofit requirements of coal-fired power units in different levels of regions;

[0127] A direction determination module 420, configured to determine the technical retrofit direction of the coal-fired power units to be retrofitted according to the unit types of the coal-fired power units to be retrofitted;

[0128] A plan determination module 430, configured to determine multiple candidate coal-fired power unit retrofit plans that meet the technical retrofit direction, and determine a target coal-fired power unit retrofit plan from the multiple candidate coal-fired power unit retrofit plans according to the technical characteristic information and cost value information of each candidate coal-fired power unit retrofit plan;

[0129] An adjustment module 440, configured to adjust the target coal-fired power unit retrofit plan based on the operating conditions and retrofit constraint conditions of the coal-fired power units to be retrofitted, and determine an adjusted coal-fired power unit retrofit plan.

[0130] In one embodiment, the areas of different levels include a first-level area and a second-level area, and the administrative division level of the first level is higher than that of the second level; the unit determination module 410 is specifically configured to determine the transformation requirements of the coal-fired power units for the areas of different levels according to the power grid peak shaving requirements of the first-level area and the power grid power supply requirements of the second-level area; wherein, the power grid peak shaving requirements are used to represent the power fluctuation regulation ability requirements on the power grid side, and the power grid power supply requirements are used to represent the power consumption requirements on the user side.

[0131] In one embodiment, the unit determination module 410 is specifically configured to input the output power data of the power generation equipment in the power system into a power balance model to obtain a system power supply margin; the system power supply margin is used to represent the difference between the power supply capacity and the power supply demand of the power system at any moment; according to the system power supply margin, the influence of the areas to which the coal-fired power units in the power system belong on the stability of the power grid structure, and the disaster resistance guarantee requirements of the areas to which the coal-fired power units belong, the power grid power supply requirements of the second-level area are determined.

[0132] In one embodiment, the power balance model is expressed as:

[0133] ;

[0134] The is the system power supply margin, and the is the output power of the non-new energy power generation equipment in the power system; is the output power of the photovoltaic power generation equipment in the power system; is the output power of the wind power generation equipment in the power system; the is the discharge power of the energy storage system in the power system; the is the charging power of the energy storage system; is the power exchanged with the external network through the tie line, positive for incoming and negative for outgoing; represents a power shortage when represents a power surplus when.

[0135] In one embodiment, the direction determination module 420 is configured to, when the unit type of the coal-fired power unit to be transformed is a condensing unit, determine the technical transformation direction of the coal-fired power unit to be transformed as the transformation of the boiler side in the condensing unit; when the unit type of the coal-fired power unit to be transformed is a cogeneration unit, determine the technical transformation direction of the coal-fired power unit to be transformed as the internal transformation of the steam turbine in the cogeneration unit and the external transformation of the thermal power plant in the cogeneration unit.

[0136] In one embodiment, the technical characteristic information includes the unit characteristics, technical usage scenarios, and technical application conditions of a coal-fired power unit; the cost value information includes the total life-cycle cost of the retrofit of the coal-fired power unit; the solution determination module 430 is specifically configured to determine the technical comparison information between the candidate coal-fired power unit retrofit solutions according to the unit characteristics, the technical usage scenarios, and the technical application conditions of each of the candidate coal-fired power unit retrofit solutions; input the total life-cycle cost into a value evaluation model to obtain the peaking power generation cost per kWh; and determine a target coal-fired power unit retrofit solution from the multiple candidate coal-fired power unit retrofit solutions according to the technical comparison information and the peaking power generation cost per kWh; where the value evaluation model is expressed as: ; the is the peaking power generation cost per kWh, the is the total life-cycle cost, and the is the total power generation volume of the coal-fired power unit participating in peaking during the whole life cycle after the retrofit.

[0137] Each module in the above-mentioned coal-fired power flexibility retrofit solution output device for an urban load center power grid can be implemented in whole or in part by software, hardware, and their combination. Each of the above modules can be embedded in the processor of a computer device in the form of hardware or be independent of it, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0138] In an exemplary embodiment, a computer device is provided. The computer device can be a terminal, and its internal structure diagram can be as Figure 5As shown in the figure. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC), or other technologies. When the computer program is executed by the processor, it realizes a method for outputting a coal-fired power flexibility transformation plan for an urban load center power grid. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer covering the display screen, or a button, a trackball, or a touchpad provided on the housing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0139] Those skilled in the art can understand that Figure 5 the structure shown in the figure is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0140] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are realized.

[0141] In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by the processor, the steps in the above method embodiments are realized.

[0142] In an embodiment, a computer program product is provided, including a computer program. When the computer program is executed by the processor, the steps in the above method embodiments are realized.

[0143] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0144] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0145] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0146] The above-described embodiments merely represent several implementation manners of this application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application shall be subject to the appended claims.

Claims

1. A method for outputting a coal-fired power flexibility retrofit plan for an urban load center power grid, characterized in that, The method includes: Determining a coal-fired power unit to be retrofitted from the power system according to the retrofit requirements of different levels of regions for the coal-fired power unit; Determining the technical retrofit direction of the coal-fired power unit to be retrofitted according to the unit type of the coal-fired power unit to be retrofitted; Determining a plurality of candidate coal-fired power unit retrofit schemes that meet the technical retrofit direction, and determining a target coal-fired power unit retrofit scheme from the plurality of candidate coal-fired power unit retrofit schemes according to the technical characteristic information and cost value information of each candidate coal-fired power unit retrofit scheme; Adjusting the target coal-fired power unit retrofit scheme based on the operating conditions and retrofit constraint conditions of the coal-fired power unit to be retrofitted, and determining the adjusted coal-fired power unit retrofit scheme.

2. The method according to claim 1, wherein The different levels of regions include the first-level region and the second-level region, and the administrative division level of the first level is higher than that of the second level; Before determining the coal-fired power unit to be retrofitted from the power system according to the retrofit requirements of different levels of regions for the coal-fired power unit, the method further includes: Determining the retrofit requirements of the different levels of regions for the coal-fired power unit according to the grid peak shaving requirements of the first-level region and the grid power supply requirements of the second-level region; Wherein, the grid peak shaving requirement is used to characterize the power fluctuation regulation ability requirement on the grid side, and the grid power supply requirement is used to characterize the power consumption requirement on the user side.

3. The method according to claim 2, characterized in that, Before determining the retrofit requirements of the different levels of regions for the coal-fired power unit according to the grid peak shaving requirements of the first-level region and the grid power supply requirements of the second-level region, the method further includes: Inputting the output power data of the power generation equipment in the power system into a power balance model to obtain a system power supply margin; the system power supply margin is used to characterize the difference between the power supply capacity and the power supply demand of the power system at any moment; Determining the grid power supply requirements of the second-level region according to the system power supply margin, the influence of the regions where each coal-fired power unit in the power system is located on the stability of the grid structure, and the disaster resistance guarantee requirements of the regions where each coal-fired power unit is located.

4. The method according to claim 3, wherein The power balance model is expressed as: ； The is the supply margin of the system, and the is the output power of non-new energy power generation equipment in the power system; is the output power of photovoltaic power generation equipment in the power system; is the output power of wind power generation equipment in the power system; the is the discharge power of the energy storage system in the power system; the is the charging power of the energy storage system; is the power exchanged with the external network through the tie line, positive for incoming and negative for outgoing; represents a power deficit when represents a power surplus when.

5. The method according to claim 1, wherein Determining the technical retrofit direction of the coal-fired power unit to be retrofitted according to the unit type of the coal-fired power unit to be retrofitted includes: When the unit type of the coal-fired power unit to be retrofitted is a condensing unit, determining the technical retrofit direction of the coal-fired power unit to be retrofitted as the retrofit of the boiler side in the condensing unit; When the unit type of the coal-fired power unit to be retrofitted is a cogeneration unit, determining the technical retrofit direction of the coal-fired power unit to be retrofitted as the internal retrofit of the steam turbine in the cogeneration unit and the external retrofit of the thermal power plant in the cogeneration unit.

6. The method according to claim 1, characterized in that, The technical characteristic information includes the unit characteristics of the coal-fired power unit, the technical usage scenarios and technical application conditions; the cost value information includes the total life cycle cost of the coal-fired power unit retrofit; determining a target coal-fired power unit retrofit scheme from the plurality of candidate coal-fired power unit retrofit schemes according to the technical characteristic information and cost value information of each candidate coal-fired power unit retrofit scheme includes: Determine the technical comparison information between the candidate coal-fired power unit retrofit schemes according to the unit characteristics, the technical usage scenarios, and the technical application conditions of each of the candidate coal-fired power unit retrofit schemes; Input the total life cycle cost into the value evaluation model to obtain the peak shaving cost per kWh; Determine the target coal-fired power unit retrofit scheme from the multiple candidate coal-fired power unit retrofit schemes according to the technical comparison information and the peak shaving cost per kWh; Among them, the value evaluation model is expressed as: ； The said is the peak shaving electricity cost, and the is the total life cycle cost, and the is the total generated electricity of the coal-fired power unit participating in peak shaving during the whole life cycle after transformation.

7. An output device for the coal-fired power flexibility retrofit scheme of an urban load center power grid, characterized in that, The device includes: A unit determination module, configured to determine the coal-fired power unit to be retrofitted from the power system according to the retrofit requirements of coal-fired power units in different levels of regions; A direction determination module, configured to determine the technical retrofit direction of the coal-fired power unit to be retrofitted according to the unit type of the coal-fired power unit to be retrofitted; A scheme determination module, configured to determine multiple candidate coal-fired power unit retrofit schemes that meet the technical retrofit direction, and determine the target coal-fired power unit retrofit scheme from the multiple candidate coal-fired power unit retrofit schemes according to the technical characteristic information and cost value information of each of the candidate coal-fired power unit retrofit schemes; An adjustment module, configured to adjust the target coal-fired power unit retrofit scheme based on the operating conditions and retrofit constraint conditions of the coal-fired power unit to be retrofitted, and determine the adjusted coal-fired power unit retrofit scheme.

8. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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