A method and system for evaluating the reserve adequacy of annual maintenance plan for thermal power units

Abstract

The present invention discloses a method and system for evaluating the reserve adequacy of a thermal power unit's annual maintenance plan. The method comprises the following steps: obtaining the maximum load of the power grid to be evaluated for reserve adequacy by ten-day forecasting, calculating the capacity of the operating grid-connected coal-fired power units based on the maximum load; calculating the maintenance reserve capacity and the annual coal-fired power unit's maintenance capacity time; calculating the annual coal-fired power unit's maintenance required capacity time based on the grid-connected coal-fired power unit's capacity; calculating the maintenance capacity time occupancy rate based on the annual coal-fired power unit's maintenance capacity time and the annual coal-fired power unit's maintenance required capacity time; and obtaining an evaluation result based on the maintenance capacity time occupancy rate and a preset evaluation criterion. The method of the present invention has low dependence on load forecast accuracy and the future topology of the power grid, and can effectively solve the technical difficulties in preparing data for power grid adequacy evaluation on a medium- to long-term scale.

Description

Technical Field

[0001] The present invention belongs to the field of power systems and automation thereof, and in particular relates to a method and system for evaluating the reserve adequacy of an annual maintenance plan for a thermal power unit. Background Art

[0002] At present, building a clean, low-carbon, safe and efficient modern power energy system is an important way to achieve energy transformation; under the "dual carbon" goal, the explosive growth of new energy and large-scale grid connection have become the general trend, and the traditional fossil energy-based power system is transforming into a high-proportion new energy power system; at the same time, coal-fired thermal power is still the ballast of electricity and the foundation of power grid stability. Its power generation accounts for about 56%. On the road to achieving the "dual carbon" goal and energy transformation, coal-fired thermal power plays an indispensable role in maintaining stability, safety and people's livelihood.

[0003] Annual and monthly maintenance schedules for coal-fired power plants affect the grid's reserve capacity adequacy. Assessing the grid's reserve capacity adequacy under medium- and long-term maintenance plans for coal-fired power plants can mitigate the impact of maintenance on grid operations and ensure grid security. Existing grid reserve capacity adequacy assessments fail to differentiate between power source types and are primarily based on short-term load conditions. Their indicators are often based on maintenance probabilities, such as the probability of insufficient maintenance reserve capacity and the expected value of insufficient maintenance reserve capacity. Few methods have been studied for evaluating grid reserve adequacy under thermal power plant maintenance plans over medium- and long-term timescales. Furthermore, due to poor load forecasting accuracy and uncertainty about the future grid topology and power flow distribution, short-term assessment indicators fail to effectively calculate grid reserve adequacy over medium- and long-term timescales, making grid reserve adequacy assessment difficult. Summary of the Invention

[0004] The present invention aims to provide a method and system for assessing the reserve adequacy of thermal power generation units for annual maintenance plans, addressing one or more of the aforementioned technical issues. This method, with its low dependence on load forecast accuracy and the future topology of the power grid, effectively addresses the technical challenges of preparing data for medium- to long-term power grid adequacy assessments.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A first aspect of the present invention provides a method for evaluating the reserve margin of an annual maintenance plan for a thermal power unit, comprising the following steps:

[0007] Obtaining the maximum load of the power grid for which reserve adequacy assessment is to be made by forecasting in ten-day intervals, and obtaining the capacity of the grid-connected coal-fired power units in operation based on the maximum load;

[0008] Based on the capacity of the grid-connected coal-fired power unit and the preset capacity of the temporary maintenance coal-fired power unit, the maintenance spare capacity is calculated to obtain the annual maintenance capacity time of the coal-fired power unit;

[0009] Based on the capacity of the grid-connected coal-fired power units, the capacity time required for the maintenance of the coal-fired power units throughout the year is calculated;

[0010] The maintenance capacity time occupancy rate is calculated based on the annual maintainable capacity time of the coal-fired power units and the annual capacity time required for maintenance of the coal-fired power units, and an evaluation result is obtained based on the maintenance capacity time occupancy rate and preset evaluation criteria.

[0011] A further improvement of the method of the present invention is that the ten-day period is specifically divided into 36 ten-day periods.

[0012] The ten-day forecast obtains the maximum load of the power grid to be evaluated for reserve adequacy, and the capacity of the grid-connected coal-fired power generation units in operation is calculated based on the maximum load:

[0013] The calculation expression for the capacity of the grid-connected coal-fired power units is: capacity of the grid-connected coal-fired power units = power generation capacity required to be provided by the coal-fired power units / (1-average obstruction rate of coal-fired power); wherein, the power generation capacity required to be provided by the coal-fired power units = maximum load + operating reserve capacity - maximum power generation capacity of hydropower units - maximum power generation capacity of nuclear power units - new energy power generation capacity - maximum gas power generation capacity - annual medium- and long-term transaction power.

[0014] A further improvement of the method of the present invention is that the maintenance spare capacity is calculated based on the capacity of the grid-connected coal-fired power unit and the preset temporary maintenance coal-fired power unit capacity, and the annual maintenance capacity time of the coal-fired power unit is calculated based on the maintenance spare capacity.

[0015] The calculation expression of the maintenance reserve capacity is: maintenance reserve capacity = coal-fired power installed capacity - grid-connected coal-fired power unit capacity - coal-fired power unit capacity for emergency repairs and fault elimination;

[0016] The calculation expression for the annual maintainable capacity time of the coal-fired power unit is: the annual maintainable capacity time of the coal-fired power unit = the maintenance spare capacity within the maintainable period × the number of days; wherein, the maintenance spare capacity within the maintainable period is determined based on the maintenance spare capacity and the maintainable period and non-maintenance window of the coal-fired power unit set in ten days.

[0017] A further improvement of the method of the present invention is that the step of calculating the capacity time required for the annual coal-fired power unit maintenance based on the capacity of the grid-connected coal-fired power unit specifically includes:

[0018] Based on the capacity of the grid-connected coal-fired power units and in accordance with the "Guidelines for Equipment Maintenance of Coal-fired Power Generation Enterprises", the capacity time required for maintenance of the coal-fired power units throughout the year is calculated.

[0019] A further improvement of the method of the present invention is that the preset evaluation criterion is expressed as,

[0020] Maintenance capacity time occupancy rate Maintenance and spare parts Maintenance capacity time occupancy rate>1 insufficient 0.7<Maintenance capacity time occupancy rate<1 Tight Maintenance capacity time occupancy rate < 0.7 adequate .

[0021] A further improvement of the method of the present invention is that, in the calculation of the maintenance capacity time occupancy rate based on the annual maintenance capacity time of the coal-fired power unit and the annual capacity time required for maintenance of the coal-fired power unit,

[0022] The calculation expression of the maintenance capacity time occupancy rate is: maintenance capacity time occupancy rate = capacity time required for maintenance of coal-fired power units throughout the year / capacity time available for maintenance of coal-fired power units throughout the year.

[0023] A second aspect of the present invention provides a system for evaluating the reserve adequacy of an annual maintenance plan for a thermal power unit, comprising:

[0024] A grid-connected coal-fired power unit capacity acquisition module is used to predict and obtain the maximum load of the power grid to be evaluated for reserve adequacy by ten days, and calculate and obtain the capacity of the operating grid-connected coal-fired power unit based on the maximum load;

[0025] A module for obtaining the annual repairable capacity time of coal-fired power units, configured to calculate the repair spare capacity based on the capacity of the grid-connected coal-fired power units and the preset capacity of the temporary repair coal-fired power units, and to calculate the annual repairable capacity time of the coal-fired power units based on the repair spare capacity;

[0026] A module for obtaining the capacity time required for maintenance of coal-fired power units throughout the year, configured to calculate the capacity time required for maintenance of coal-fired power units throughout the year based on the capacity of the grid-connected coal-fired power units;

[0027] The evaluation result acquisition module is used to calculate the maintenance capacity time occupancy rate based on the annual coal-fired power unit's maintainable capacity time and the annual coal-fired power unit's maintenance capacity time, and obtain the evaluation result based on the maintenance capacity time occupancy rate and preset evaluation criteria.

[0028] A further improvement of the system of the present invention is that the annual coal-fired power unit maintenance capacity time acquisition module is specifically used to calculate the maintenance spare capacity based on the capacity of the grid-connected coal-fired power unit and the preset temporary maintenance coal-fired power unit capacity, and in the annual coal-fired power unit maintenance capacity time obtained based on the maintenance spare capacity,

[0029] The calculation expression of the maintenance reserve capacity is: maintenance reserve capacity = coal-fired power installed capacity - grid-connected coal-fired power unit capacity - coal-fired power unit capacity for emergency repairs and fault elimination;

[0030] The calculation expression for the annual maintainable capacity time of the coal-fired power unit is: the annual maintainable capacity time of the coal-fired power unit = the maintenance spare capacity within the maintainable period × the number of days; wherein, the maintenance spare capacity within the maintainable period is determined based on the maintenance spare capacity and the maintainable period and non-maintenance window of the coal-fired power unit set in ten days.

[0031] A further improvement of the system of the present invention is that the preset evaluation criterion is expressed as,

[0032] Maintenance capacity time occupancy rate Maintenance and spare parts Maintenance capacity time occupancy rate>1 insufficient 0.7<Maintenance capacity time occupancy rate<1 Tight Maintenance capacity time occupancy rate < 0.7 adequate .

[0033] A further improvement of the system of the present invention is that the evaluation result acquisition module is specifically used to calculate the maintenance capacity time occupancy rate based on the annual coal-fired power unit's maintainable capacity time and the annual coal-fired power unit's maintenance required capacity time.

[0034] The calculation expression of the maintenance capacity time occupancy rate is: maintenance capacity time occupancy rate = capacity time required for maintenance of coal-fired power units throughout the year / capacity time available for maintenance of coal-fired power units throughout the year.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The method for evaluating the reserve adequacy of the medium- and long-term maintenance plan of coal-fired thermal power units provided by the present invention uses the maintenance capacity time occupancy rate indicator to indirectly evaluate the reserve adequacy of the medium- and long-term maintenance power grid of coal-fired thermal power units. The data accuracy and data content required by this evaluation method are relatively easy to obtain, and it has good operability on a medium- and long-term scale. At the same time, the granularity of the evaluation results can well guide the arrangement of medium- and long-term maintenance plans of coal-fired thermal power units, reducing the impact of thermal power units on the power grid due to maintenance. In summary, the method provided by the present invention has a low dependence on load forecast accuracy and the future topology of the power grid, can solve the problem of preparing power grid adequacy evaluation data on a medium- and long-term scale, and can be applied to the evaluation of reserve adequacy of the medium- and long-term maintenance plan of coal-fired thermal power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art; obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a flow chart of a method for evaluating the reserve margin of an annual maintenance plan for a thermal power unit according to an embodiment of the present invention;

[0039] Figure 2This is a flow chart of a method for evaluating the reserve margin of an annual maintenance plan for a thermal power unit according to a specific embodiment of the present invention;

[0040] Figure 3 It is a schematic diagram of the framework of a power grid backup adequacy assessment system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] The present invention is described in further detail below with reference to the accompanying drawings:

[0044] Example 1

[0045] See also Figure 1 A method for evaluating the reserve adequacy of an annual maintenance plan for a thermal power unit according to an embodiment of the present invention, specifically a method suitable for evaluating the reserve adequacy of a medium- and long-term maintenance plan for a coal-fired thermal power unit, comprises the following steps:

[0046] Ten-day forecasts are used to obtain the maximum load, maximum generating capacity of hydropower units, maximum generating capacity of nuclear power units, and maximum generating capacity of gas-fired power generation for the power grid to be assessed for reserve adequacy. Based on this data and the annual medium- and long-term transaction power consumption, the required coal-fired power generation capacity to be connected to the grid is calculated. The formula for calculating the required coal-fired power generation capacity to be connected to the grid is as follows: Required coal-fired power generation capacity to be connected to the grid = (Forecasted maximum load + Operating reserve capacity - Maximum generating capacity of hydropower units - Maximum generating capacity of nuclear power units - Renewable energy generation capacity - Maximum generating capacity of gas-fired power generation - Annual medium- and long-term transaction power consumption) / (1 - Average coal-fired power obstruction rate).

[0047] The maintenance reserve capacity is calculated based on the required grid-connected coal-fired power unit capacity, coal-fired power installed capacity, and the installed capacity of coal-fired power units for emergency repairs and fault elimination. The annual maintenance capacity time of coal-fired power units is calculated based on the maintenance reserve capacity.

[0048] Based on the installed capacity of coal-fired power plants, the capacity time required for annual coal-fired power plant maintenance is calculated according to the relevant guidelines for coal-fired power plants.

[0049] The maintenance capacity time occupancy rate is calculated based on the annual maintainable capacity time of coal-fired power units and the capacity time required for maintenance of coal-fired power units throughout the year, and the evaluation result is obtained based on the maintenance capacity time occupancy rate; among which, the maintenance capacity time occupancy rate = the capacity time required for maintenance of coal-fired power units throughout the year / the maintainable capacity time of coal-fired power units throughout the year.

[0050] In an exemplary embodiment of the present invention, the steps of obtaining the maximum load of the power grid to be evaluated for reserve adequacy by ten-day forecasting and calculating the capacity of the coal-fired power units that need to be connected to the grid based on the obtained maximum load specifically include: obtaining the maximum load of the power grid to be evaluated for reserve adequacy by ten-day forecasting, arranging a reasonable operating reserve capacity in accordance with relevant regulations, and calculating the capacity of the coal-fired power units that must be operated after deducting the hydropower, nuclear power, new energy, and gas-fired power generation capacities; exemplarily, combining the historical average annual percentage of the capacity of the coal-fired power units that were under temporary maintenance in the past three years, and then obtaining the annual maintainable capacity time (kilowatt-day) of the coal-fired power units.

[0051] The embodiment of the present invention further explains that the whole year is divided into 36 decades, and the maximum load of each decade is predicted respectively, which is used as the power supply demand to be guaranteed for compiling the unit maintenance plan; the maximum power generation capacity and consumption demand of hydropower units are predicted by decade, and at the same time, the maintenance plan of hydropower units is arranged in accordance with the principle of not affecting the consumption of hydropower in the flood season; the maximum power generation capacity of nuclear power units is arranged by decade, and the maintenance plan is arranged taking into account the nuclear power replacement cycle and maintenance needs; the new energy power generation capacity is predicted by decade, and the exemplary reference method of the embodiment of the present invention is as follows: (1) the new energy output under the guarantee rate of 80% to 90% during the peak load period, (2) the minimum power generation in the past three years, and (3) the predicted power generation considering the average simultaneous rate during the peak period in recent years; the annual medium and long-term transactions are used as the power received (the received power is positive); the gas unit takes into account the influence of natural gas supply and obstruction at different times of the year, and can set the gas turbine startup ratio coefficient and the average gas obstruction rate, startup capacity = installed capacity × startup ratio, maximum power generation capacity = startup capacity × (1-average gas obstruction).

[0052] The required generating capacity of coal-fired power units is calculated as follows: the predicted maximum load + operating reserve capacity - the maximum generating capacity of hydropower units - the maximum generating capacity of nuclear power units - the generating capacity of renewable energy - the maximum generating capacity of gas-fired power - the annual medium- and long-term transaction power;

[0053] Calculate the installed capacity of coal-fired power plants that need to be connected to the grid, which is equal to the power generation capacity required from coal-fired power plants / (1-the average blockage rate of coal-fired power);

[0054] Calculate the installed capacity of coal-fired power plants for temporary repairs and fault elimination; exemplary reference methods: (1) based on the percentage of the average annual installed capacity of coal-fired power plants for temporary repairs and fault elimination in the past three years to the total installed capacity; (2) based on experience.

[0055] Calculate the maintenance reserve capacity; where maintenance reserve capacity = installed coal-fired power capacity - installed capacity of coal-fired power units that need to be connected to the grid - installed capacity of coal-fired power units for emergency repairs and fault elimination. Preferably, to ensure power supply capacity during peak load periods in winter and summer, coal-fired power units are scheduled for maintenance during ten days and non-maintenance windows (no coal-fired power units will be scheduled for maintenance during the non-maintenance windows, even if there is a surplus balance).

[0056] Calculate the annual maintenance capacity time of coal-fired power units (kW·day), which is equal to the maintenance standby capacity in the maintenance period × the number of days.

[0057] The core invention points of the above method provided by the embodiment of the present invention include:

[0058] First, it can well consider the grid's reserve adequacy in the medium and long term to ensure the safe operation of the grid: reserve capacity is one of the guarantees for grid operation. Under many uncertain factors such as new energy and electricity markets, the adequacy of reserve capacity is increasingly important to grid security. Compared with previous reserve adequacy assessment methods, the present invention can extend the assessment time scale to years, while general adequacy assessments are only based on the day-ahead and week-ahead time scales. Adequate reserve is a necessary condition for reliable power supply in extreme situations such as extreme heat and no wind, and extreme cold and no wind. Adequate reserve capacity can ensure the reliable supply of power under a variety of random and unstable factors.

[0059] Secondly, the coal-fired thermal power reserve margin assessment method described in the present invention has high assessment feasibility and relatively simple and accurate data acquisition compared to the previous reliance of reserve margin on data such as power flow calculation and unit planning.

[0060] The third is to guide the maintenance arrangements of coal-fired power units: Currently, as the ballast of power operation, the maintenance of coal-fired power units affects the capacity of the power grid. The rationality assessment of the maintenance plan arrangement of coal-fired power units considering the abundance of spare parts can well guide the arrangement of medium- and long-term maintenance plans of coal-fired power units.

[0061] In the embodiment of the present invention, the steps for obtaining the capacity time required for the annual maintenance of coal-fired power generation units specifically include: "Guidelines for Equipment Maintenance of Coal-fired Thermal Power Generation Enterprises" (DL / T 838-2017) stipulates that "the interval between level A maintenance of the unit is 5 to 7 years, and between two level A maintenances, a level C maintenance should be carried out every 1 to 2 years, which can be adjusted to level B or D maintenance according to the situation." According to this requirement, it is set that the coal-fired thermal power units are scheduled for level A maintenance every 6 years, and level B, C, and D maintenance are arranged during this period. The maintenance sequence is cyclically arranged annually as follows: A maintenance - C maintenance - B maintenance - C maintenance - B maintenance - D maintenance, that is, the level A and D maintenance cycles are 6 years, and the level B and C maintenance cycles are 3 years. The maintenance cycles and days of the coal-fired thermal power units are shown in Table 1.

[0062] Table 1. Maintenance cycle and days of coal-fired power units

[0063]

[0064]

[0065] Calculate the average annual maintenance time required for each level of units, which is equal to installed capacity * (A-level maintenance days / A-level maintenance cycle + B-level maintenance days / B-level maintenance cycle + C-level maintenance days / C-level maintenance cycle + D-level maintenance days / D-level maintenance cycle).

[0066] The evaluation criteria in the embodiment of the present invention are shown in Table 2, which is defined as: maintenance capacity time occupancy rate = capacity time required for coal-fired power unit maintenance throughout the year / capacity time available for maintenance of coal-fired power unit throughout the year.

[0067] Table 2. Evaluation criteria

[0068] Maintenance capacity time occupancy rate Maintenance and spare parts Maintenance capacity time occupancy rate>1 insufficient 0.7<Maintenance capacity time occupancy rate<1 Tight Maintenance capacity time occupancy rate < 0.7 adequate

[0069] The method for evaluating the reserve adequacy of a medium- and long-term maintenance plan for a coal-fired thermal power unit provided in an embodiment of the present invention uses a maintenance capacity time occupancy rate indicator to indirectly evaluate the reserve adequacy of a power grid for medium- and long-term maintenance of a coal-fired thermal power unit. The data accuracy and data content required by the evaluation method are relatively easy to obtain, and the method has good operability on a medium- and long-term scale. At the same time, the granularity of the evaluation results can well guide the arrangement of medium- and long-term maintenance plans for coal-fired thermal power units, thereby reducing the impact of maintenance of thermal power units on the power grid.

[0070] The following are device embodiments of the present invention, which can be used to perform the method embodiments of the present invention. For details not disclosed in the device embodiments, please refer to the method embodiments of the present invention.

[0071] Example 2

[0072] In yet another embodiment of the present invention, a power grid reserve adequacy assessment system is provided, comprising:

[0073] A grid-connected coal-fired power unit capacity acquisition module is used to predict and obtain the maximum load of the power grid to be evaluated for reserve adequacy by ten days, and calculate and obtain the capacity of the operating grid-connected coal-fired power unit based on the maximum load;

[0074] A module for obtaining the annual repairable capacity time of coal-fired power units, configured to calculate the repair spare capacity based on the capacity of the grid-connected coal-fired power units and the preset capacity of the temporary repair coal-fired power units, and to calculate the annual repairable capacity time of the coal-fired power units based on the repair spare capacity;

[0075] A module for obtaining the capacity time required for maintenance of coal-fired power units throughout the year, configured to calculate the capacity time required for maintenance of coal-fired power units throughout the year based on the capacity of the grid-connected coal-fired power units;

[0076] An evaluation result acquisition module is used to calculate the maintenance capacity time occupancy rate based on the annual maintainable capacity time of coal-fired power units and the capacity time required for maintenance of coal-fired power units throughout the year, and obtain an evaluation result based on the maintenance capacity time occupancy rate and preset evaluation criteria; wherein, the calculation expression of the maintenance capacity time occupancy rate is maintenance capacity time occupancy rate = capacity time required for maintenance of coal-fired power units throughout the year / annual maintainable capacity time of coal-fired power units.

[0077] Example 3

[0078] In another embodiment of the present invention, a computer device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, wherein the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of the method for evaluating the reserve margin of the annual maintenance plan of a thermal power unit.

[0079] In another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides storage space, which stores the terminal's operating system. In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk storage. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the method for evaluating the reserve margin of the annual maintenance plan for thermal power units in the above embodiment.

[0080] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0081] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the reserve adequacy of an annual maintenance plan for a thermal power unit, characterized in that: The following steps are involved: Obtaining the maximum load of the power grid for which reserve adequacy assessment is to be made by forecasting in ten-day intervals, and obtaining the capacity of the grid-connected coal-fired power units in operation based on the maximum load; Based on the capacity of the grid-connected coal-fired power unit and the preset capacity of the temporary maintenance coal-fired power unit, the maintenance spare capacity is calculated to obtain the annual maintenance capacity time of the coal-fired power unit; Based on the capacity of the grid-connected coal-fired power units, the capacity time required for the maintenance of the coal-fired power units throughout the year is calculated; The maintenance capacity time occupancy rate is calculated based on the annual maintainable capacity time of the coal-fired power units and the annual capacity time required for maintenance of the coal-fired power units, and an evaluation result is obtained based on the maintenance capacity time occupancy rate and a preset evaluation criterion; in, The calculation expression for the grid-connected coal-fired power unit capacity is: grid-connected coal-fired power unit capacity = required power generation capacity of the coal-fired power unit / (1 - average coal-fired power obstruction rate); wherein, the required power generation capacity of the coal-fired power unit = maximum load + operating reserve capacity - maximum power generation capacity of the hydropower unit - maximum power generation capacity of the nuclear power unit - renewable energy power generation capacity - maximum gas power generation capacity - annual medium- and long-term transaction power; The calculation expression of the maintenance reserve capacity is: maintenance reserve capacity = coal-fired power installed capacity - grid-connected coal-fired power unit capacity - coal-fired power unit capacity for emergency repairs and fault elimination; The calculation expression for the annual coal-fired power unit's maintainable capacity time is: annual coal-fired power unit's maintainable capacity time = maintainable spare capacity within the maintainable period × number of days; wherein the maintainable spare capacity within the maintainable period is determined based on the maintainable spare capacity and the maintainable period and non-maintenance window of the coal-fired power unit set by ten days; Based on the capacity of the grid-connected coal-fired power units and in accordance with the "Guidelines for Equipment Maintenance of Coal-fired Power Generation Enterprises", the capacity time required for maintenance of the coal-fired power units throughout the year is calculated.

2. The method for evaluating the reserve adequacy of the annual maintenance plan of a thermal power unit according to claim 1, characterized in that: Specifically, the ten-day period is divided into 36 ten-day periods.

3. The method for evaluating the reserve adequacy of the annual maintenance plan of a thermal power unit according to claim 1, characterized in that: The preset evaluation criterion is expressed as: 。 4. The method for evaluating the reserve adequacy of the annual maintenance plan of a thermal power unit according to claim 1, characterized in that: In the calculation of the maintenance capacity time occupancy rate based on the annual coal-fired power unit maintenance capacity time and the annual coal-fired power unit maintenance capacity time, The calculation expression of the maintenance capacity time occupancy rate is: maintenance capacity time occupancy rate = capacity time required for maintenance of coal-fired power units throughout the year / capacity time available for maintenance of coal-fired power units throughout the year.

5. A thermal power unit annual maintenance plan reserve margin assessment system, characterized in that: include: A grid-connected coal-fired power unit capacity acquisition module is used to predict and obtain the maximum load of the power grid to be evaluated for reserve adequacy by ten days, and calculate and obtain the capacity of the operating grid-connected coal-fired power unit based on the maximum load; A module for obtaining the annual repairable capacity time of coal-fired power units, configured to calculate the repair spare capacity based on the capacity of the grid-connected coal-fired power units and the preset capacity of the temporary repair coal-fired power units, and to calculate the annual repairable capacity time of the coal-fired power units based on the repair spare capacity; A module for obtaining the capacity time required for maintenance of coal-fired power units throughout the year, configured to calculate the capacity time required for maintenance of coal-fired power units throughout the year based on the capacity of the grid-connected coal-fired power units; An evaluation result acquisition module is used to calculate the maintenance capacity time occupancy rate based on the annual coal-fired power unit's maintainable capacity time and the annual coal-fired power unit's maintenance capacity time, and obtain an evaluation result based on the maintenance capacity time occupancy rate and a preset evaluation criterion; in, The calculation expression for the grid-connected coal-fired power unit capacity is: grid-connected coal-fired power unit capacity = required power generation capacity of the coal-fired power unit / (1 - average coal-fired power obstruction rate); wherein, the required power generation capacity of the coal-fired power unit = maximum load + operating reserve capacity - maximum power generation capacity of the hydropower unit - maximum power generation capacity of the nuclear power unit - renewable energy power generation capacity - maximum gas power generation capacity - annual medium- and long-term transaction power; The calculation expression of the maintenance reserve capacity is: maintenance reserve capacity = coal-fired power installed capacity - grid-connected coal-fired power unit capacity - coal-fired power unit capacity for emergency repairs and fault elimination; The calculation expression for the annual coal-fired power unit's maintainable capacity time is: annual coal-fired power unit's maintainable capacity time = maintainable spare capacity within the maintainable period × number of days; wherein the maintainable spare capacity within the maintainable period is determined based on the maintainable spare capacity and the maintainable period and non-maintenance window of the coal-fired power unit set by ten days; Based on the capacity of the grid-connected coal-fired power units and in accordance with the "Guidelines for Equipment Maintenance of Coal-fired Power Generation Enterprises", the capacity time required for maintenance of the coal-fired power units throughout the year is calculated.

6. A thermal power unit annual maintenance plan reserve margin assessment system according to claim 5, characterized in that: The preset evaluation criterion is expressed as:

7. The system for evaluating the reserve adequacy of annual maintenance plan of thermal power units according to claim 5, characterized in that: The evaluation result acquisition module is specifically used to calculate the maintenance capacity time occupancy rate based on the annual coal-fired power unit maintenance capacity time and the annual coal-fired power unit maintenance capacity time. The calculation expression of the maintenance capacity time occupancy rate is: maintenance capacity time occupancy rate = capacity time required for maintenance of coal-fired power units throughout the year / capacity time available for maintenance of coal-fired power units throughout the year. 。

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