Start-stop planning method and device for coal pulverizing system of thermal power plant based on power grid information

Abstract

The invention provides a thermal power plant pulverizing system start-stop planning method and device based on power grid information, and the method comprises the steps: obtaining a predicted load instruction number set based on a preset time period according to the operation data of a current unit, the real-time operation data of a power grid, and a real-time clearing result; based on the planned reference time period, according to the current unit operation data, the predicted load instruction number set and the coal pulverizing system design parameters, obtaining a unit time period output ratio number set of a single coal pulverizing system; and obtaining a start-stop planning result of the coal pulverizing system according to the current unit operation data and the unit time period output ratio set of the planning reference time period. According to the method, the predicted load instruction of the current unit in the future preset time period is obtained by collecting the real-time operation data of the power grid, and an accurate start-stop planning result is further obtained, so that the energy consumption of the current unit is greatly reduced on the premise of ensuring the load response of the power grid, and meanwhile, the AGC response capability and the operation economy of the power plant are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power unit operation optimization, and in particular to a method and device for planning the start and stop of a pulverizing system in a thermal power plant based on power grid information. Background Art

[0002] The pulverizing system is a critical auxiliary equipment in thermal power plants, grinding coal into pulverized coal of desired quality before feeding it into the boiler furnace for combustion. Typically, a single thermal power unit requires five to eight pulverizing systems. Operators start and stop individual pulverizing systems depending on load or operational circumstances. Starting and stopping a pulverizing system requires a series of operations, including adjusting the hot and cold air dampers and opening and closing the gates. From the moment a pulverizer start command is received until the pulverizer is operational, it typically takes approximately 10 minutes, a significant time. To improve load response, operators often preemptively start a pulverizing system based on operational experience to serve as a hot standby. This prevents the pulverizing system from taking too long to start up and potentially preventing it from responding to AGC loads. However, power plants cannot predict future changes in AGC commands, resulting in prolonged standby time for the hot standby pulverizing system or even further shutdown, resulting in energy waste. Consequently, the startup and shutdown methods of thermal power plant pulverizing systems often face a conflict between AGC responsiveness and operational efficiency, and a solution currently lacks. Summary of the Invention

[0003] In response to the problems existing in the prior art, the present invention provides a start-stop planning method for a pulverizing system in a thermal power plant based on grid information, which collects real-time grid operation data, obtains predicted load instructions for the current unit in a preset future period, and further obtains accurate start-stop planning results. This method can significantly reduce the energy consumption of the current unit while ensuring the grid load response, while improving the AGC response capability and operating economy of the power plant.

[0004] To achieve the above object, the present invention adopts the following technical solution: a method for planning the start and stop of a pulverizing system in a thermal power plant based on power grid information, characterized in that it comprises the following steps: Respectively obtain current unit operation data, milling system design parameters, power grid real-time operation data, and real-time clearing results of the spot system; obtain unit time periods, preset time periods, and planning reference time periods, and divide the preset time periods based on the unit time periods, wherein the planning reference time periods are continuous unit time periods located at the end of the preset time periods; Based on the preset time period, a set of forecast load instructions is obtained according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing result; the set of forecast load instructions is a collection of forecast load instructions for each unit time period within the preset time period; Based on the planning reference period, obtaining a unit period output ratio number set of a single pulverizing system according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters, wherein the unit period output ratio number set is a set of unit period output ratios of each unit period within the planning reference period; The start-stop planning result of the pulverizing system is obtained according to the current unit operation data and the unit period output ratio number set of the planning reference period.

[0005] In some embodiments, the current unit operation data includes the number of operating units of the pulverizing system; The step of obtaining the start-stop planning result of the pulverizing system according to the current unit operation data and the unit period output ratio number set of the planning reference period includes: Obtain a first output ratio and a second output ratio; The start-stop planning result is obtained according to the number of running units of the pulverizing system, the output ratio number set of the unit time period, the first output ratio and the second output ratio: When each of the unit time period output ratios in the unit time period output ratio number set is greater than the first output ratio, the start-stop planning result is to send a first signal, and the first signal is to start an additional pulverizing system; When each of the unit time period output ratios in the unit time period output ratio number set is less than the second output ratio, the start-stop planning result is to send a second signal, and the second signal is to gradually reduce the output of one pulverizing system.

[0006] In some embodiments, the first output ratio is 90% and the second output ratio is 30%.

[0007] In some embodiments, the current unit operation data further includes actual unit load; Based on the preset time period, the steps of obtaining a set of forecast load instruction numbers according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing result are as follows: Using a linear interpolation method, an initial forecast load number set is obtained according to the actual load of the unit and the real-time clearing result, wherein the initial forecast load number set includes an initial forecast load value of each unit time period within the preset time period; Building a prediction model based on the real-time operation data of the power grid and the setting data of the current dispatch system; Based on the prediction model, the prediction load instruction number set is obtained according to the initial prediction load number set.

[0008] In some embodiments, the boundary constraints of the prediction model include maximum allowable load increment, dead zone, wind and solar power output, and frequency fluctuation.

[0009] In some embodiments, the current unit operating data further includes a current total coal consumption, and the pulverizing system design parameters include a maximum design output of a single pulverizing system; based on the planning reference period, the step of obtaining the unit period output ratio number set of the single pulverizing system according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters is as follows: Obtaining current unit power generation coal consumption according to the ratio of the current total coal consumption to the actual load of the unit; Obtaining the unit period predicted coal consumption number set according to the predicted load instruction number set and the current unit power generation coal consumption, wherein the unit period predicted coal consumption number set is a collection of predicted coal consumption for each unit period within the preset time period; Based on the planning reference period, the unit period output ratio number set is obtained according to the unit period predicted coal consumption number set and the maximum design output of the single pulverizing system.

[0010] In some embodiments, the preset time period is 15 minutes, and the unit time period is 1 minute.

[0011] In some embodiments, the planning reference period includes the continuous unit periods from the 11th unit period to the 15th unit period in the preset period.

[0012] A start-stop planning device for a pulverizing system in a thermal power plant, used to implement the start-stop planning method for a pulverizing system in a thermal power plant based on power grid information, comprising a data acquisition unit, a first calculation unit, a second calculation unit, and a planning control unit; The data acquisition unit: Used to obtain the current unit operation data, pulverizing system design parameters, real-time power grid operation data and real-time clearing results of the spot system; Used to obtain unit time period, preset time period and planning reference time period respectively; The first computing unit: for obtaining a set of forecast load instruction data based on the preset time period and the current unit operation data, the real-time operation data of the power grid and the real-time clearing result; The second computing unit: for obtaining a unit period output ratio number set of a single pulverizing system based on the planned reference period, according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters; The planning control unit: Used to obtain the start and stop planning results of the pulverizing system based on the current unit operation data and the unit period output ratio number set of the planning reference period.

[0013] In some embodiments, the planning control unit includes a data input module, a comparison module, and a control module; The data input module: Used to obtain a first output ratio and a second output ratio; The comparison module: Used to obtain a start-stop planning result according to the number of running units of the pulverizing system, the output ratio number set per unit time period, the first output ratio, and the second output ratio; The control module: Used to control the milling system according to the start-stop planning results.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention obtains the predicted load instructions and trend changes of the current unit in the future preset time period by collecting real-time operation data of the power grid, which can more accurately reflect the changing trend of the load instructions of the current unit. Through the start-stop planning results further obtained, the operating personnel can start or stop a pulverizing system at a precise time point, so that the current unit can greatly reduce the energy consumption under the premise of ensuring the load response of the power grid, and at the same time improve the AGC response capability and operation economy of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a flow chart of a method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information in an embodiment of the present invention; Figure 2 Schematic diagram of the process of obtaining a predicted load instruction set in an embodiment of the present invention; Figure 3 Schematic diagram of the process of obtaining the start-stop planning result in an embodiment of the present invention; Figure 4 Schematic diagram of a device for implementing a method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information in an embodiment of the present invention; Figure 5 This is a schematic diagram of the existing AGC operating system.

[0016] Among them, the accompanying drawings are marked as: 100, grid side; 101, first database; 102, debugging system; 103, first intelligent computing server; 200, power plant side; 201, RTU terminal; 202, operator; 203, control system; 204, second database; 205, thermal power unit; 206, second intelligent computing server. DETAILED DESCRIPTION

[0017] A brief schematic diagram of the existing AGC operating system is as follows: Figure 5As shown, it is divided into the power plant side and the grid side. The dispatching system generates real-time AGC instructions for the unit on the grid side based on the real-time information of the grid and the real-time clearing results, and sends the real-time AGC instructions to the RTU terminal (Remote Terminal Unit) on the power plant side. The real-time AGC instructions are then transmitted to the thermal power unit control system. The thermal power unit control system receives the current unit operation data from the power plant side database and generates unit control instructions. At the same time, the operating personnel form the start and stop judgment results of the pulverizing system and other operation instructions based on the unit operation data and operation experience, operate the control system, and complete the operation control of the thermal power unit. In addition, the RTU terminal receives the data from the power plant side database and completes the upload of important data such as the actual load of the unit. In response to the problems in the background technology, at present, Figure 5 The following situations may occur when judging the start and stop of the grinding group based on the experience of the operators: 1. When an AGC load increase command is issued, the existing pulverizing system reaches its maximum output and cannot increase the coal supply. However, if a pulverizing system is started at this time, coal consumption will not increase until 10 minutes later. During this 10 minutes, the unit cannot follow the AGC command, causing the power plant to be evaluated; 2. Based on experience, the operator started a milling system, which entered hot standby mode. However, the AGC command did not increase, and the milling system stopped operating after a period of hot standby, resulting in energy waste.

[0018] The two common phenomena above indicate the contradiction between the start and stop of the pulverizing system in power plant operation, namely the contradiction between the grid AGC command response and energy saving and consumption reduction. Currently, there is a lack of solutions to the above methods.

[0019] To clearly illustrate the technical features of this solution, the following detailed description of the implementation methods of this application will be given in conjunction with the accompanying drawings and examples, so that the implementation process of how this application applies technical means to solve technical problems and achieve corresponding technical effects can be fully understood and implemented accordingly. The embodiments of this application and the various features therein can be combined with each other as long as they do not conflict with each other, and the resulting technical solutions are all within the scope of protection of this application.

[0020] See also Figure 1 The embodiment of the present invention provides a method for planning the start and stop of a pulverizing system in a thermal power plant based on power grid information, which is characterized by comprising the following steps: Obtain real-time clearing results of the spot system and real-time operation data of the power grid; obtain design parameters of the pulverizing system and current unit operation data; obtain unit time periods, preset time periods, and planning reference time periods, and divide the preset time periods based on the unit time periods. The planning reference time period is the continuous unit time period located at the end of the preset time period; Usually, the rolling clearing results of the spot system are: some provinces clear for 2 hours at a time, that is, 2 hours are divided into 8 15-minute periods. These 8 15-minute periods are closely connected and interrelated in the clearing results. The clearing model will comprehensively consider the power supply and demand, unit climbing ability, network constraints and other factors within the entire 2 hours to determine the electricity and price of each 15-minute period; some provinces clear for 1 hour at a time, that is, 1 hour is divided into 4 15-minute periods. Compared with clearing for 2 hours at a time, the independence of each 15-minute period in the clearing process is relatively enhanced when clearing for 1 hour at a time. The clearing model pays more attention to the supply and demand balance of each 15-minute period within the 1 hour, but it will still consider the operating restrictions and climbing ability of the unit within the 1 hour. Preferably, the preset period in the present disclosure is 15 minutes, and the preset period of 15 minutes is determined by the dynamic characteristics of the pulverizing system; Furthermore, when the unit time period is 1 minute and the preset time period is 15 minutes, each 1 minute is a unit time period, that is, each preset time period includes 15 unit time periods.

[0021] Based on the preset time period, a set of forecast load instructions is obtained according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing results; the set of forecast load instructions is the collection of forecast load instructions for each unit time period within the preset time period; In some embodiments, the current unit operating data includes the actual load of the unit ; See also Figure 2 , based on the preset time period, the steps for obtaining the forecast load instruction number set according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing results are as follows: Using linear interpolation method, according to the actual load of the unit and real-time clearing results Obtain the initial forecast load data set and clear the results in real time The initial forecast load data set is based on the real-time clearing results of the preset period, and includes the initial forecast load values ​​of each unit period within the preset period. , initial predicted load value for: ; Where, The first The initial forecast load value for each unit period, It is the serial number of the unit time period within the preset time period; A prediction model is constructed based on the real-time operation data of the power grid, the initial predicted load data set and the setting data of the current dispatching system; the prediction model is: ; Where, The first Forecast load instructions for unit periods, The first Forecast load instructions for unit periods, To maximize the function, The first The initial forecast load value for each unit period, is the maximum permissible load increment, is the grid frequency in Hz, is the frequency deviation protection value, in Hz; the real-time operation data of the power grid includes the maximum allowable load increment and the power grid frequency, and the setting data of the current dispatching system includes the frequency deviation protection value; on the basis of the initial predicted load value obtained by the linear interpolation method, considering the maximum allowable load increment, the power grid frequency and the frequency deviation protection value, the first predicted load value within the preset period can be obtained under the premise of the power grid load response. The predicted load instruction for each unit period can more accurately reflect the changing trend of the current unit load instruction.

[0022] In some embodiments, the boundary constraints of the prediction model include a maximum allowable load increment, a dead zone, wind and solar output, and frequency fluctuations; the real-time operation data of the power grid also includes a dead zone, wind and solar output, and frequency fluctuations; Based on the prediction model, the forecast load instruction set is obtained according to the initial forecast load set. On the basis of obtaining the real-time clearing results, constraints and corrections are performed according to the real-time operation data of the power grid to obtain the forecast load instruction.

[0023] Based on the planning reference period, the unit period output ratio set of a single pulverizing system is obtained according to the current unit operating data, the predicted load instruction set and the pulverizing system design parameters. The unit period output ratio set is the set of unit period output ratios of each unit period within the planning reference period. In some embodiments, the current unit operating data further includes the current total coal consumption, and the pulverizing system design parameters include the maximum design output of a single pulverizing system. Based on the planning reference period, the steps of obtaining a unit period output ratio number set of the single pulverizing system according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters are as follows: The current unit power generation coal consumption is obtained based on the ratio of the current total coal consumption to the actual load of the unit , the current unit coal consumption for power generation for: ; Where, is the current total coal consumption, in t / h, is the current unit load, in MW, is the current unit coal consumption for power generation, in t / (MWh); The unit period forecast coal consumption set is obtained based on the forecast load instruction set and the current unit power generation coal consumption. The unit period forecast coal consumption set is the set of forecast coal consumption for each unit period within the preset period. The unit period forecast coal consumption is: ; Where, The first The predicted coal consumption for each unit period, in t / h; Based on the planning reference period, the unit period output ratio data set is obtained according to the unit period predicted coal consumption data set and the maximum design output of a single pulverizing system. The unit period output ratio is: ; Where, The first The unit time period output ratio of a single pulverizing system in a unit time period, the unit is %, It is the maximum design output of a single pulverizing system, in t / h; Preferably, the planning reference period is the continuous unit period from the 11th unit period to the 15th unit period in the preset period, and the unit period output ratio number set is 、 、 、 、 ; The start-stop planning results of the pulverizing system are obtained based on the current unit operation data and the unit period output ratio data set of the planning reference period.

[0024] By collecting real-time operation data of the power grid, we can obtain the predicted load instructions and trend changes of the current unit in the preset time period in the future, which can more accurately reflect the changing trend of the current unit load instructions. Through the further obtained start-stop planning results, the operating personnel can start or stop a pulverizing system at a precise time point, so that the current unit can greatly reduce energy consumption while ensuring the load response of the power grid, while improving the AGC response capability and operating economy of the power plant.

[0025] See also Figure 3 ,In some embodiments, the current unit operation data includes the number of operating units of the pulverizing system; The steps of obtaining the start-stop planning result of the pulverizing system based on the current unit operation data and the unit period output ratio data set of the planning reference period include: Obtain a first output ratio and a second output ratio; preferably, the first output ratio is 90% and the second output ratio is 30%; The start-stop planning results are obtained based on the number of running mills, the output ratio set per unit time period, the first output ratio, and the second output ratio: When the output ratio of each unit period in the unit period output ratio number set is greater than the first output ratio, the start-stop planning result is to send a first signal, and the first signal is to start an additional pulverizing system; that is, when 、 、 、 、 When both are greater than 90%, the start-stop planning result is to send the first signal, that is, to start an additional milling system; When the output ratio of each unit period in the unit period output ratio number set is less than the second output ratio, the start-stop planning result is to send a second signal, and the second signal is to gradually reduce the output of a pulverizing system; that is, when 、 、 、 、 When both are less than 30%, the start-stop planning result is to send a second signal, that is, gradually reducing the output of a powder-making system. Preferably, gradually reducing the output of a powder-making system means stopping a powder-making system with preset parameters, and the preset parameters are preset time, usually the preset time is 10 minutes, that is, slowly stopping a powder-making system within 10 minutes, or the preset parameters are preset deceleration acceleration, usually the preset deceleration acceleration is 0.2m / s², that is, stopping a powder-making system with a deceleration acceleration of 0.2m / s².

[0026] A start-stop planning device for a pulverizing system in a thermal power plant is used to implement a start-stop planning method for a pulverizing system in a thermal power plant based on power grid information, comprising a data acquisition unit, a first calculation unit, a second calculation unit, and a planning control unit; Data acquisition unit: Used to obtain the current unit operation data, pulverizing system design parameters, real-time grid operation data, and real-time clearing results of the spot system. The current unit operation data includes the number of operating units in the pulverizing system, the actual load of the unit, and the current total coal consumption; Used to obtain unit time period, preset time period and planning reference time period respectively; First calculation unit: Used to obtain a set of forecast load instruction data based on the preset time period according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing results; Second computing unit: It is used to obtain the unit period output ratio data set of a single pulverizing system based on the planning reference period, according to the current unit operation data, the predicted load instruction data set and the pulverizing system design parameters; Planning control unit: It is used to obtain the start and stop planning results of the pulverizing system based on the current unit operation data and the unit period output ratio set of the planning reference period.

[0027] In some embodiments, the planning control unit includes a data input module, a comparison module, and a control module; Data input module: Used to obtain a first output ratio and a second output ratio; Comparison module: Used to obtain start-stop planning results based on the number of running mills, the output ratio set per unit time period, the first output ratio, and the second output ratio; Control Module: Used to control the milling system according to the start and stop planning results.

[0028] See also Figure 4 A first intelligent computing server 103 is arranged on the grid side 100, and a second intelligent computing server 206 is arranged on the power plant side 200. The data acquisition unit obtains the real-time operation data of the grid and the real-time clearing results of the spot system from the first database 101. The data acquisition unit obtains the current unit operation data and the pulverizing system design parameters from the power plant side 200, or the data acquisition unit obtains the unit operation data from the dispatching system 102. The second database 204 located on the power plant side 200 obtains the current unit operation data by collecting data from the thermal power unit 205, and the data acquisition unit obtains the unit time period, the preset time period and the planning reference time period respectively. The data acquisition unit is at least partially set in the first intelligent computing server 103 or the second intelligent computing server 206, or the data acquisition unit is separately set outside the first intelligent computing server 103 and the second intelligent computing server 206. The data acquisition unit can obtain the data such as the unit time period, the preset time period and the planning reference time period by direct input. The dispatching system 102 generates a real-time AGC instruction based on the real-time operation data of the power grid obtained from the first database 101, the real-time clearing results of the spot system, and the actual load obtained from the power plant side 200; a first calculation unit is set in the first intelligent computing server 103, and the first calculation unit obtains a set of predicted load instructions based on the current unit operation data, the real-time operation data of the power grid and the real-time clearing results based on a preset time period. The real-time AGC instruction and the set of predicted load instructions are transmitted to the RTU terminal 201 on the power plant side through the dispatching system 102, and the RTU terminal 201 transmits the set of predicted load instructions to the second intelligent computing server 206, and the RTU terminal 201 transmits the real-time AGC instruction to the control system 203; the second intelligent computing server 2 A second calculation unit and a planning control unit are respectively set in 06. The second calculation unit obtains a unit period output ratio number set of a single pulverizing system based on the planning reference period, according to the current unit operation data, the predicted load instruction number set and the pulverizing system design parameters; the planning control unit obtains the start and stop planning result of the pulverizing system according to the current unit operation data and the unit period output ratio number set of the planning reference period, and the start and stop planning result is transmitted to the operator 202. The operator 202 sends an operation instruction to the control system according to the start and stop planning result; the control system sends a control instruction to the thermal power unit 205 according to the operation instruction sent by the operator 202, the real-time AGC instruction transmitted by the RTU terminal 201, and the current unit operation data obtained from the second database 204.

[0029] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information, characterized by: The following steps are involved: Obtain the current unit operation data, pulverizing system design parameters, real-time grid operation data, and real-time clearing results of the spot system respectively; Acquire a unit time period, a preset time period, and a planning reference time period, divide the preset time period based on the unit time period, and the planning reference time period is a continuous unit time period located after the preset time period; Based on the preset time period, a set of forecast load instructions is obtained according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing result; the set of forecast load instructions is a collection of forecast load instructions for each unit time period within the preset time period; Based on the planning reference period, obtaining a unit period output ratio number set of a single pulverizing system according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters, wherein the unit period output ratio number set is a set of unit period output ratios of each unit period within the planning reference period; The start-stop planning result of the pulverizing system is obtained according to the current unit operation data and the unit period output ratio number set of the planning reference period.

2. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 1, characterized in that: The current unit operation data includes the number of running units of the pulverizing system; The step of obtaining the start-stop planning result of the pulverizing system according to the current unit operation data and the unit period output ratio number set of the planning reference period includes: Obtain a first output ratio and a second output ratio; The start-stop planning result is obtained according to the number of running units of the pulverizing system, the output ratio number set of the unit time period, the first output ratio and the second output ratio: When each of the unit time period output ratios in the unit time period output ratio number set is greater than the first output ratio, the start-stop planning result is to send a first signal, and the first signal is to start an additional pulverizing system; When each of the unit time period output ratios in the unit time period output ratio number set is less than the second output ratio, the start-stop planning result is to send a second signal, and the second signal is to gradually reduce the output of one pulverizing system.

3. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 2, characterized in that: The first output ratio is 90%, and the second output ratio is 30%.

4. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 1, characterized in that: The current unit operation data also includes the actual load of the unit; Based on the preset time period, the steps of obtaining a set of forecast load instruction numbers according to the current unit operation data, the real-time operation data of the power grid and the real-time clearing result are as follows: Using a linear interpolation method, an initial forecast load number set is obtained according to the actual load of the unit and the real-time clearing result, wherein the initial forecast load number set includes an initial forecast load value of each unit time period within the preset time period; Building a prediction model based on the real-time operation data of the power grid and the setting data of the current dispatch system; Based on the prediction model, the prediction load instruction number set is obtained according to the initial prediction load number set.

5. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 4, characterized in that: The boundary constraints of the prediction model include maximum allowable load increment, dead zone, wind and solar power output, and frequency fluctuation.

6. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 4, characterized in that: The current unit operation data also includes the current total coal consumption, and the pulverizing system design parameters include the maximum design output of a single pulverizing system; Based on the planning reference period, the step of obtaining the unit period output ratio number set of a single pulverizing system according to the current unit operation data, the predicted load instruction number set and the pulverizing system design parameters is as follows: Obtaining current unit power generation coal consumption according to the ratio of the current total coal consumption to the actual load of the unit; Obtaining the unit period predicted coal consumption number set according to the predicted load instruction number set and the current unit power generation coal consumption, wherein the unit period predicted coal consumption number set is a collection of predicted coal consumption for each unit period within the preset time period; Based on the planning reference period, the unit period output ratio number set is obtained according to the unit period predicted coal consumption number set and the maximum design output of the single pulverizing system.

7. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 1, characterized in that: The duration of the preset time period is 15 minutes, and the unit time period is 1 minute.

8. The method for planning the start and stop of a pulverized coal mill system in a thermal power plant based on power grid information according to claim 7, characterized in that: The planning reference period includes the continuous unit periods from the 11th unit period to the 15th unit period in the preset period.

9. A start-stop planning device for a pulverizing system in a thermal power plant, used to implement the start-stop planning method for a pulverizing system in a thermal power plant based on power grid information according to any one of claims 1 to 8, characterized in that: It includes a data acquisition unit, a first calculation unit, a second calculation unit and a planning control unit; The data acquisition unit: Used to obtain the current unit operation data, pulverizing system design parameters, real-time power grid operation data and real-time clearing results of the spot system; Used to obtain unit time period, preset time period and planning reference time period respectively; The first computing unit: for obtaining a set of forecast load instruction data based on the preset time period and the current unit operation data, the real-time operation data of the power grid and the real-time clearing result; The second computing unit: for obtaining a unit period output ratio number set of a single pulverizing system based on the planned reference period, according to the current unit operating data, the predicted load instruction number set, and the pulverizing system design parameters; The planning control unit: Used to obtain the start and stop planning results of the pulverizing system based on the current unit operation data and the unit period output ratio number set of the planning reference period.

10. The start-stop planning device for a pulverized coal pulverizing system in a thermal power plant according to claim 9, characterized in that: The planning control unit includes a data input module, a comparison module and a control module; The data input module: Used to obtain a first output ratio and a second output ratio; The comparison module: Used to obtain a start-stop planning result according to the number of running units of the pulverizing system, the output ratio number set per unit time period, the first output ratio, and the second output ratio; The control module: Used to control the milling system according to the start-stop planning results.

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