Unit primary frequency modulation method based on main steam heat supply adjusting valve

Abstract

The invention provides a unit primary frequency modulation method based on a main steam heat supply adjusting valve, and the method comprises the steps: determining the occurrence probability of steam deviation frequency modulation in each time period according to weather data of different time periods, and taking the time period of which the occurrence probability is greater than a threshold value as a deviation frequency modulation time period; determining a compensation steam load of the deviation frequency modulation time period according to the weather data, the historical frequency modulation data and the power supply prediction load of the deviation frequency modulation time period; according to the heat supply prediction load of the deviation frequency modulation time period, determining a heat supply reliability coefficient for performing primary frequency modulation by using the compensation steam load in the deviation frequency modulation time period; and according to the heat supply prediction load, the power supply prediction load and the compensation steam load of the deviation frequency modulation time period, determining a main steam adjusting strategy, and when the power supply prediction load cannot meet the primary frequency modulation requirement, performing primary frequency modulation of the unit by using a main steam heat supply adjusting valve. The reliability of a frequency modulation strategy is improved, primary frequency modulation of the unit is carried out through the main steam heat supply adjusting valve, and energy loss caused by an original adjusting valve is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of unit frequency regulation optimization, and specifically, relates to a unit primary frequency regulation method based on a main steam heating regulating valve. Background Art

[0002] In order to solve the frequency regulation flexibility of thermal power units, in the existing invention patent application CN202210159229.4 "A method for combined secondary frequency regulation of heating butterfly valve and thermal power unit in a new power system", the size of the extraction steam flow is controlled by changing the opening of the heating butterfly valve, thereby compensating the AGC regulation of the unit. The heating butterfly valve and the thermal power unit are combined for secondary frequency regulation, which can improve the AGC regulation ability of the heating thermal power unit, improve the AGC regulation performance, and increase the flexibility of the unit. However, there are the following technical problems:

[0003] When performing primary frequency modulation processing, the existing technical solutions often achieve the primary frequency modulation processing of the unit by calculating the difference between the generator frequency and the turbine speed deviation. However, the above technical solutions will inevitably lead to heat energy loss of the main steam of the unit when performing frequency modulation processing. Therefore, how to improve the primary frequency modulation capability of the unit on the basis of reducing heat energy loss has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem solved by the present application is: how to provide a primary frequency regulation method of a unit based on a main steam heating regulating valve which can reduce the heat energy loss of the main steam and improve the reliability of frequency regulation.

[0005] The present application provides a unit primary frequency regulation method based on a main steam heating regulating valve, the unit primary frequency regulation method comprising:

[0006] Determine the occurrence probability of steam deviation frequency modulation in each period according to weather data in different periods, and take the period with the occurrence probability greater than the threshold as the deviation frequency modulation period;

[0007] Determine the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period;

[0008] Determine, according to the predicted heat supply load during the deviation frequency modulation period, a heat supply reliability coefficient for performing a primary frequency modulation using the compensating steam load during the deviation frequency modulation period;

[0009] When the heating reliability coefficient does not meet the predetermined conditions, the main steam regulation strategy is determined according to the heating forecast load, power supply forecast load and compensating steam load during the deviation frequency modulation period, and when the power supply forecast load cannot meet the primary frequency modulation demand, the main steam heating regulating valve is used to perform primary frequency modulation of the unit.

[0010] Optionally, the method for determining the occurrence probability of steam deviation frequency modulation in each time period according to weather data in different time periods includes:

[0011] A historical similar time period of the time period is determined according to the weather data of the time period.

[0012] The historical similar period in which the number of steam deviation frequency modulation is greater than the preset deviation number is regarded as the frequency modulation deviation period;

[0013] The occurrence probability of steam deviation frequency modulation in the period is determined by using the proportion of the frequency modulation deviation period in the historical similar periods.

[0014] Optionally, the weather data includes temperature data, humidity data and wind speed data.

[0015] Optionally, the unit primary frequency modulation method further includes:

[0016] Determine whether there is a main steam shortage based on the deviation between the main steam amount required by the turbine and the main steam amount required for frequency regulation. If so, it will be used as steam deviation for frequency regulation.

[0017] Optionally, the method for determining a historically similar period of the period according to the weather data of the period includes:

[0018] Calculate the deviation of weather data in different dimensions between the time period and the historical time period, and calculate the average value of each deviation;

[0019] When the average value is within the preset deviation range, it is determined to be a historically similar period.

[0020] Optionally, the method for determining the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period includes:

[0021] Determine historical frequency modulation data at different frequency modulation ratios according to analysis data of weather data during the deviation frequency modulation period;

[0022] Determining the main steam compensation proportional factor of the deviation frequency modulation period according to the historical frequency modulation data;

[0023] The compensating steam load is determined according to the main steam compensation proportional factor and the power supply forecast load.

[0024] Optionally, the frequency regulation ratio is the ratio of the frequency regulation amount to the amount of steam required for the steam turbine to generate electricity.

[0025] Optionally, the historical frequency modulation data includes the number of historical frequency modulations and the time points corresponding to different number of historical frequency modulations.

[0026] Optionally, the method for determining the main steam regulation strategy according to the predicted heating load, the predicted power supply load, and the compensating steam load during the deviation frequency modulation period includes:

[0027] Determine the steam load output at different times based on the predicted heating load, predicted power supply load, and compensatory steam load at different times during the deviation frequency modulation period;

[0028] The regulation strategy of the main steam in the deviation frequency modulation period is determined based on the steam load output at different times.

[0029] Optionally, when the power supply forecast load cannot meet the primary frequency regulation demand, the method of using the main steam heating regulating valve to perform primary frequency regulation of the unit includes:

[0030] When the power supply forecast load cannot meet the primary frequency regulation demand, the main steam regulation amount is determined by using the primary frequency regulation demand and the power supply forecast load;

[0031] The main steam heating regulating valve is used to adjust the frequency of the unit once according to the main steam adjustment amount.

[0032] The present application provides a method for primary frequency regulation of a unit based on a main steam heating regulating valve, which has the following technical effects:

[0033] (1) The probability of occurrence of steam deviation frequency modulation in different time periods and the time period of deviation frequency modulation are determined according to the weather data of different time periods, thereby realizing an accurate assessment of the probability of occurrence of steam deviation frequency modulation from the perspective of weather data and historical frequency modulation data, and also laying the foundation for determining differentiated main steam regulation strategies according to different time periods. On the basis of ensuring the reliability of frequency modulation, the reliability and timeliness of frequency modulation processing are also improved.

[0034] (2) When the power supply forecast load cannot meet the primary frequency regulation demand, the main steam heating regulating valve is used to perform the primary frequency regulation of the unit, thereby avoiding the technical problem of energy loss caused by the original regulating valve, so that the regulated heat energy can be used for heating, which not only meets the frequency regulation demand of the unit, but also avoids the frequency regulation loss of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a flow chart of a method for primary frequency regulation of a unit based on a main steam heating regulating valve according to one or more embodiments. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with 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.

[0037] Before describing in detail the various embodiments of the present application, the technical concept of the present application is first briefly described: when frequency modulation is currently performed, there is a large loss of heat energy, and the reliability of frequency modulation is not strong. To this end, the present application provides a method for primary frequency modulation of a unit based on a main steam heating regulating valve, which first determines the deviation frequency modulation period according to weather data, further determines the compensating steam load of the deviation frequency modulation period in combination with historical frequency modulation data and power supply forecast load, and further determines the frequency modulation strategy in combination with the heating forecast load and the power supply forecast load. When the power supply forecast load cannot meet the primary frequency modulation demand, the main steam heating regulating valve is used to perform the primary frequency modulation of the unit. On the one hand, the use of weather data and historical frequency modulation data can improve the reliability of the frequency modulation strategy, and on the other hand, the main steam heating regulating valve is used to perform the primary frequency modulation of the unit, thereby avoiding the energy loss caused by the original regulating valve. The specific principle of the method for primary frequency modulation of a unit based on a main steam heating regulating valve of the present application is described below in combination with more embodiments.

[0038] Specifically, Figure 1 As shown, the primary frequency regulation method of the unit based on the main steam heating regulating valve in this embodiment includes:

[0039] Step S10: Determine the occurrence probability of steam deviation frequency modulation in each time period according to weather data in different time periods, and take the time period with an occurrence probability greater than a threshold as the deviation frequency modulation time period.

[0040] Step S20: Determine the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period.

[0041] Step S30: determining a heat supply reliability coefficient for performing a primary frequency modulation using a compensating steam load during the deviation frequency modulation period according to the heat supply forecast load during the deviation frequency modulation period;

[0042] Step S40: When the heating reliability coefficient does not meet the predetermined conditions, the main steam regulation strategy is determined according to the heating forecast load, power supply forecast load and compensating steam load during the deviation frequency modulation period, and when the power supply forecast load cannot meet the primary frequency modulation demand, the main steam heating regulating valve is used to perform the primary frequency modulation of the unit.

[0043] In one or more embodiments, before step S10, it is necessary to first determine the judgment criteria for steam deviation frequency modulation, specifically, to determine whether there is a main steam shortage based on the deviation between the main steam amount required by the turbine and the main steam amount required for frequency modulation, and if so, it is used as steam deviation frequency modulation.

[0044] In step S10, the weather data includes temperature data, humidity data and wind speed data. Specifically, the method for determining the occurrence probability of steam deviation frequency modulation in each time period according to the weather data in different time periods includes:

[0045] A historical similar time period of the time period is determined according to the weather data of the time period.

[0046] The historical similar period in which the number of steam deviation frequency modulation is greater than the preset deviation number is regarded as the frequency modulation deviation period;

[0047] The occurrence probability of steam deviation frequency modulation in the period is determined by using the proportion of the frequency modulation deviation period in the historical similar period. The occurrence probability of steam deviation frequency modulation ranges from 0 to 1.

[0048] Exemplarily, the method for determining a historically similar period of the period based on the weather data of the period includes: calculating the deviation of weather data of different dimensions between the period and the historical period, and calculating the average value of each deviation; when the average value is within a preset deviation range, it is determined to be a historically similar period.

[0049] In other embodiments, the method for determining the occurrence probability of the steam deviation frequency modulation in the time period is:

[0050] Determine a historical similar period of the period by using the weather data of the period, and when the total number of steam deviation frequency modulations in the historical similar period is less than the preset frequency modulation number: determine that the period does not belong to the deviation frequency modulation period;

[0051] When the total number of steam deviation frequency modulations in similar historical periods is not less than the preset frequency modulation times:

[0052] Obtaining the total number of steam deviation frequency modulations in the historical similar period, and when the total number of steam deviation frequency modulations in the historical similar period is within a preset number range, determining that the period belongs to a deviation frequency modulation period;

[0053] When the total number of steam deviation frequency modulations in the historical similar period is not within the preset number range:

[0054] Determine the average number of deviation frequency modulations by the ratio of the total number of steam deviation frequency modulations in the historical similar period to the historical similar period; when the average number of deviation frequency modulations does not meet the requirement, determine that the period belongs to the deviation frequency modulation period;

[0055] When the average deviation frequency modulation times does not meet the requirements:

[0056] The number of steam deviation frequency modulations in the historical similar time periods is used to determine the historical similar time periods in which the number of steam deviation frequency modulations is greater than the preset deviation number, and the historical similar time periods are used as the frequency modulation deviation time periods. When the number of the frequency modulation deviation time periods does not meet the requirement:

[0057] Obtaining the ratio of the frequency modulation deviation period to the historical similar period, and when the ratio of the frequency modulation deviation period to the historical similar period does not meet the requirement, determining that the period belongs to the deviation frequency modulation period;

[0058] When the number of frequency modulation deviation periods meets the requirement or the proportion of the frequency modulation deviation periods in the number of historical similar periods meets the requirement:

[0059] When the average deviation frequency modulation times does not meet the requirements:

[0060] The total number of steam deviation frequency modulations in the historical similar time period is obtained, and the occurrence probability of the steam deviation frequency modulation in the time period is determined in combination with the proportion of the frequency modulation deviation time period in the historical similar time period and the number of frequency modulation deviation time periods.

[0061] In one or more embodiments, in step S20, the method for determining the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period comprises the following steps:

[0062] Step S21, determining historical frequency modulation data under different frequency modulation ratios according to the analysis data of the weather data in the deviation frequency modulation period;

[0063] Step S22, determining the main steam compensation proportional factor of the deviation frequency modulation period according to the historical frequency modulation data;

[0064] Step S23: determining the compensating steam load according to the main steam compensation proportional factor and the power supply forecast load.

[0065] Exemplarily, the frequency modulation ratio is the ratio of the frequency modulation amount to the amount of steam required for power generation by the steam turbine, and the historical frequency modulation data includes the historical frequency modulation times and the moments corresponding to different historical frequency modulation times.

[0066] In one or more embodiments, the method for determining the main steam compensation proportional factor during the deviation frequency modulation period in step S22 includes:

[0067] Determine a historical similar period of the period based on the weather data of the period, and determine historical frequency modulation data under different frequency modulation ratios based on the historical frequency modulation data of the historical similar period;

[0068] According to the historical frequency modulation data under different frequency modulation ratios, the number of historical frequency modulations under different frequency modulation ratios is determined;

[0069] The main steam compensation proportional factor in the deviation frequency modulation period is determined by using the historical frequency modulation times under different frequency modulation ratios. The main steam compensation proportional factor in the deviation frequency modulation period is the frequency modulation ratio with the largest historical frequency modulation times.

[0070] In another embodiment, the method for determining the main steam compensation proportional factor in the deviation frequency modulation period in step S22 comprises the following steps:

[0071] Step S221, determining a historically similar period of the period based on the weather data of the period, determining historical frequency modulation data at different frequency modulation ratios based on the historical frequency modulation data of the historically similar period, and determining historical frequency modulation times at different frequency modulation ratios based on the historical frequency modulation data at different frequency modulation ratios;

[0072] Step S222, determining the frequency modulation frequency coefficient under different frequency modulation ratios by using the historical frequency modulation times under different frequency modulation ratios and the historical frequency modulation times in different historical similar time periods;

[0073] Step S223: determining the main steam compensation proportional factor in the deviation frequency modulation period according to the frequency modulation frequency coefficient under different frequency modulation ratios.

[0074] It should be noted that the main steam compensation proportional factor in the deviation frequency modulation period is determined according to the frequency modulation frequency coefficient under different frequency modulation ratios, specifically including:

[0075] When there is a frequency modulation ratio whose frequency modulation frequency coefficient is greater than the preset frequency modulation coefficient, the frequency modulation ratio with the largest frequency modulation frequency coefficient is used as the main steam compensation proportional factor in the deviation frequency modulation period;

[0076] When there is no frequency modulation ratio whose frequency modulation frequency coefficient is greater than the preset frequency coefficient, the frequency modulation ratio is divided into different frequency modulation ratio intervals according to different frequency modulation ratio deviation amounts, and the interval frequency coefficients of different frequency modulation ratio intervals are determined according to the frequency modulation frequency coefficients of the frequency modulation ratios in different frequency modulation ratio intervals, and the main steam compensation proportional factor in the deviation frequency modulation period is determined based on the average value of the frequency modulation ratios of the frequency modulation ratio interval with the largest interval frequency coefficient.

[0077] In another embodiment, the above step S221 includes the following steps S2211-S2214, specifically:

[0078] Step S2211, determining a historically similar period of the period based on the weather data of the period, determining historical frequency modulation data at different frequency modulation ratios based on the historical frequency modulation data of the historically similar period, and determining the number of historical frequency modulations at different frequency modulation ratios based on the historical frequency modulation data at different frequency modulation ratios;

[0079] Step S2212: when there is a frequency modulation ratio whose historical frequency modulation times are greater than the preset frequency threshold, the main steam compensation proportional factor in the deviation frequency modulation period is determined by using the historical frequency modulation times; when there is no frequency modulation ratio whose historical frequency modulation times are greater than the preset frequency threshold, the process proceeds to step S2213;

[0080] Step S2213, determining the number of historical frequency modulations within a preset period based on the number of historical frequency modulations under different frequency modulation ratios, taking the frequency modulation ratio of the historical frequency modulation number within the preset frequency modulation number interval as the candidate frequency modulation ratio, when there is a candidate frequency modulation ratio whose number of historical frequency modulations within the preset period is greater than the preset frequency modulation number threshold, proceeding to step S2214, when the number of historical frequency modulations of different candidate frequency modulation ratios within the preset period is not greater than the preset frequency modulation number threshold, proceeding to step S222;

[0081] Step S2214: Determine the main steam compensation proportional factor in the deviation frequency modulation period by using the alternative frequency modulation ratio with the largest number of historical frequency modulation times within the preset period.

[0082] In one or more embodiments, step S222 includes the following steps:

[0083] Step S2221, determine the historical similar time periods corresponding to the different frequency modulation ratios according to the historical frequency modulation times under different frequency modulation ratios, and use them as matching time periods. When there is a frequency modulation ratio with a number of matching time periods greater than the preset number of matching time periods, proceed to step S2222; when there is no frequency modulation ratio with a number of matching time periods greater than the preset number of matching time periods, proceed to step S2223;

[0084] Step S2222, taking the frequency modulation ratio whose number of matching time periods is greater than the preset number of matching time periods as the screening frequency modulation ratio, when there is a screening frequency modulation ratio whose historical frequency modulation times are greater than the preset number threshold, the main steam compensation proportional factor in the deviation frequency modulation period is determined by using the historical frequency modulation times corresponding to the screening frequency modulation ratio, and when there is no screening frequency modulation ratio whose historical frequency modulation times are greater than the preset number threshold, proceeding to step S2223;

[0085] Step S2223, taking the matching period whose historical frequency modulation times is greater than the preset historical frequency threshold as the screening matching period, when there is a frequency modulation ratio whose number of screening matching periods is greater than the preset number of screening matching periods, the number of screening matching periods is used to determine the main steam compensation proportional factor in the deviation frequency modulation period, and when there is no frequency modulation ratio whose number of screening matching periods is greater than the preset number of screening matching periods, proceeding to step S2224;

[0086] Step S2224: determine the frequency modulation frequency coefficient under different frequency modulation ratios by using the historical frequency modulation times under different frequency modulation ratios and the historical frequency modulation times in different historical similar time periods, and then proceed to step S223.

[0087] Exemplarily, the method for determining the compensating steam load according to the main steam compensation proportional factor and the power supply forecast load in step S23 is: taking the average value of the power supply forecast load during the deviation frequency modulation period as the power supply forecast load during the deviation frequency modulation period, and determining the compensating steam load by multiplying the average value of the power supply forecast load and the main steam compensation proportional factor.

[0088] In one or more embodiments, the method for determining the heating reliability coefficient in step S30 is:

[0089] Step S301, determining the heating forecast load at different times in the deviation frequency modulation period based on the analysis data of the heating forecast load in the deviation frequency modulation period;

[0090] Step S302, determining the deviation coefficient of the heating forecast load at different times according to the heating forecast load at different times and the compensating steam load;

[0091] Step S303, determining the deviation time based on the deviation coefficient of the heat supply forecast load at different times, and using the number of deviation times to determine the heat supply reliability coefficient when the steam load is compensated for and a frequency modulation process is performed.

[0092] Among them, the heating reliability coefficient when compensating the steam load for a frequency modulation process is determined according to the proportion of the number of deviation moments.

[0093] In another embodiment, the method for determining the heat supply reliability coefficient during a frequency modulation process is:

[0094] Obtaining the compensating steam load during the deviation frequency modulation period, and when the compensating steam load during the deviation frequency modulation period does not meet the requirement, determining that the heat supply reliability coefficient during the primary frequency modulation process does not meet the requirement;

[0095] When the compensating steam load in the deviation frequency modulation period meets the requirements: the analysis data of the heat supply forecast load in the deviation frequency modulation period is used to determine the heat supply forecast load at different times in the deviation frequency modulation period, and the average value of the heat supply forecast load at different times is used to determine the average forecast load, and when the average forecast load is less than the preset load threshold, it is determined that the heat supply reliability coefficient during the primary frequency modulation process does not meet the requirements;

[0096] When the average value of the predicted load is not less than the preset load threshold: the moment when the predicted heat supply load is less than the preset load threshold is regarded as the low load moment, and when the number of low load moments does not meet the requirement, it is determined that the heat supply reliability coefficient during the primary frequency modulation process does not meet the requirement;

[0097] When the number of low load moments meets the requirement: the deviation coefficient of the heat supply forecast load at different moments is determined according to the heat supply forecast load at different moments and the compensating steam load, and when there is a moment when the deviation coefficient does not meet the requirement, it is determined that the heat supply reliability coefficient during the primary frequency modulation processing does not meet the requirement;

[0098] When there is no moment when the deviation coefficient does not meet the requirement: determining the deviation moment based on the deviation coefficient of the heating forecast load at different moments, and when the number of the deviation moments does not meet the requirement, determining that the heating reliability coefficient during the primary frequency modulation process does not meet the requirement;

[0099] When the number of the deviation moments meets the requirement: the heating reliability coefficient when the compensating steam load performs a frequency modulation process is determined according to the number of the deviation moments and the deviation coefficients of different deviation moments.

[0100] When the heating reliability coefficient meets the requirements, the heating forecast load and the power supply forecast load are used to determine the main steam regulation strategy for the deviation frequency modulation period; and when the power supply forecast load cannot meet the primary frequency modulation demand, the main steam heating regulating valve is used to perform the primary frequency modulation of the unit.

[0101] In step S40, the method for determining the main steam regulation strategy according to the predicted heating load, predicted power supply load, and compensating steam load during the deviation frequency modulation period includes: determining the steam load output at different times according to the predicted heating load, predicted power supply load, and compensating steam load at different times during the deviation frequency modulation period; determining the main steam regulation strategy during the deviation frequency modulation period based on the steam load output at different times. Exemplarily, when the predicted power supply load cannot meet the primary frequency modulation demand, the method for performing the primary frequency modulation of the unit using the main steam heating regulating valve includes: when the predicted power supply load cannot meet the primary frequency modulation demand, determining the main steam regulation amount using the primary frequency modulation demand and the predicted power supply load; performing the primary frequency modulation of the unit using the main steam heating regulating valve according to the main steam regulation amount.

[0102] The specific implementation methods of the present application are described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principles and spirit of the present application whose scope is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present application.

Claims

1. A method for primary frequency regulation of a unit based on a main steam heating regulating valve, characterized in that: The primary frequency modulation method of the unit comprises: Determine the occurrence probability of steam deviation frequency modulation in each period according to weather data in different periods, and take the period with the occurrence probability greater than the threshold as the deviation frequency modulation period; Determine the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period; Determine, according to the predicted heat supply load during the deviation frequency modulation period, a heat supply reliability coefficient for performing a primary frequency modulation using the compensating steam load during the deviation frequency modulation period; When the heating reliability coefficient does not meet the predetermined conditions, the main steam regulation strategy is determined according to the heating forecast load, power supply forecast load and compensating steam load during the deviation frequency modulation period, and when the power supply forecast load cannot meet the primary frequency modulation demand, the main steam heating regulating valve is used to perform primary frequency modulation of the unit.

2. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: The method for determining the occurrence probability of steam deviation frequency modulation in each time period according to weather data in different time periods includes: Determine the historical similar period of the period according to the weather data of the period: The historical similar period in which the number of steam deviation frequency modulation is greater than the preset deviation number is regarded as the frequency modulation deviation period; The occurrence probability of steam deviation frequency modulation in the period is determined by using the proportion of the frequency modulation deviation period in the historical similar periods.

3. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: The weather data includes temperature data, humidity data and wind speed data.

4. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: The primary frequency modulation method of the unit also includes: Determine whether there is a main steam shortage based on the deviation between the main steam amount required by the turbine and the main steam amount required for frequency regulation. If so, it will be used as steam deviation for frequency regulation.

5. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 2, characterized in that: The method for determining a historical similar period of the period according to the weather data of the period includes: Calculate the deviation of weather data in different dimensions between the time period and the historical time period, and calculate the average value of each deviation; When the average value is within the preset deviation range, it is determined to be a historically similar period.

6. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: The method for determining the compensating steam load during the deviation frequency modulation period according to the weather data, historical frequency modulation data and power supply forecast load during the deviation frequency modulation period includes: Determine historical frequency modulation data at different frequency modulation ratios according to analysis data of weather data during the deviation frequency modulation period; Determining the main steam compensation proportional factor of the deviation frequency modulation period according to the historical frequency modulation data; The compensating steam load is determined according to the main steam compensation proportional factor and the power supply forecast load.

7. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 6, characterized in that: The frequency modulation ratio is the ratio of the frequency modulation amount to the amount of steam required for the steam turbine to generate electricity.

8. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 6, characterized in that: The historical frequency modulation data includes the historical frequency modulation times and the time points corresponding to different historical frequency modulation times.

9. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: The method for determining the main steam regulation strategy according to the predicted heating load, the predicted power supply load, and the compensating steam load during the deviation frequency modulation period includes: Determine the steam load output at different times based on the predicted heating load, predicted power supply load, and compensatory steam load at different times during the deviation frequency modulation period; The regulation strategy of the main steam in the deviation frequency modulation period is determined based on the steam load output at different times.

10. The method for primary frequency regulation of a unit based on a main steam heating regulating valve according to claim 1, characterized in that: When the power supply forecast load cannot meet the primary frequency regulation demand, the method of using the main steam heating regulating valve to perform primary frequency regulation of the unit includes: When the power supply forecast load cannot meet the primary frequency regulation demand, the main steam regulation amount is determined by using the primary frequency regulation demand and the power supply forecast load; The main steam heating regulating valve is used to adjust the frequency of the unit once according to the main steam adjustment amount.

Images