Regulating method and device for enhancing peak power output of heat supply unit

Abstract

The application provides a kind of heating unit peak power enhancement regulation method and device, belong to heating unit field.The method includes: based on the electric output characteristic function of different heating extraction flow under the condition of zero output of low-pressure cylinder of heating unit, and the maximum heating extraction flow of the rest day time period except late peak period, determine the corresponding stable electric output of unit under the condition of zero output of low-pressure cylinder of heating unit in day time period;Based on the maximum output characteristic function of different heating extraction flow under the condition of extraction condensing heating of heating unit, and the maximum electric output of unit under the condition of extraction condensing heating in late peak period;Based on the corresponding stable electric output of unit under the condition of zero output of low-pressure cylinder of heating unit in day time period, the maximum electric output of unit under the condition of extraction condensing heating in late peak period and the promotion value of maximum electric output of unit in late peak period, determine the adjustment strategy.The application can improve the maximum electric output capacity of heating unit.

Description

Technical Field

[0001] This invention relates to the field of heating unit technology, and in particular to a method and device for adjusting the peak electrical output of a heating unit. Background Technology

[0002] With the large-scale integration of new energy sources into the grid, the peak-shaving support role of generator units within the grid has become more prominent. In some regions, most generator units also undertake the task of supplying heat to external users.

[0003] While providing heat and generating electricity, the peak maximum electrical output of heating units is affected by the amount of heat supplied. The greater the heat supply, the greater the decrease in the unit's peak maximum electrical output. In the past, due to a one-sided emphasis on heating safety, the electrical load scheduling of heating units was carried out based on the output determined by the maximum heat supply, which often resulted in insufficient peak output of the units and the failure to fully utilize the peak-shaving capacity of the heating units.

[0004] Currently, the peak power output capacity of heating units during peak electricity consumption periods in the heating season is relatively low, especially under extreme weather conditions. Heating networks have significant thermal inertia during operation. Therefore, how to utilize the heat storage characteristics of the heating network and the heating capacity of heating units under different operating modes to improve the peak power output capacity of heating units has become an urgent technical problem to be solved. Summary of the Invention

[0005] This invention provides a method and apparatus for adjusting the peak power output of a heating unit to solve the problem that the current heating units have a low peak maximum power output capacity during peak electricity consumption periods in the heating season.

[0006] In a first aspect, embodiments of the present invention provide a method for adjusting the peak power output of a heating unit, comprising:

[0007] Based on the power output characteristic function of the heating unit under the zero-output heating mode of the low-pressure cylinder, under different heating steam extraction flow rates, and the maximum heating steam extraction flow rate during the daytime period except for the evening peak period, the corresponding stable power output of the unit under the zero-output heating mode of the low-pressure cylinder during the daytime period is determined.

[0008] Based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates under the extraction-condensation heating mode, and the heating steam extraction flow rate during the evening peak period, the maximum peak power output of the unit under the extraction-condensation heating mode during the evening peak period is determined, as well as the increase value of the maximum peak power output of the unit during the evening peak period is determined.

[0009] Based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak, and the increase value of the maximum peak electrical output of the unit during the evening peak, the adjustment strategy for enhancing the peak electrical output of the heating unit is determined.

[0010] In one possible implementation, determining the increase in the unit's peak maximum electrical output during the evening peak period includes:

[0011] Determine the average peak maximum power output of the heating unit during the evening peak period when no peak power output regulation strategy is adopted;

[0012] Based on the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak period and the average value of the maximum peak electrical output of the heating unit during the evening peak period, the increase value of the maximum peak electrical output of the unit during the evening peak period is determined.

[0013] In one possible implementation, the maximum steam extraction flow rate Fn for heating during the daytime hours other than the evening peak period. rj The method for determining it is as follows:

[0014] Fn rj =Fn ave +Q qr / (△t rj -△tt-△t wf );

[0015] Wherein, △t wf For evening rush hour, Q qr △tt represents the total heating deficit during the evening peak period, △trj represents the time required to adjust and reduce the steam extraction flow rate during the evening peak period, and Fn represents the duration of the daytime period. ave This refers to the average steam extraction flow rate for heating units during the daytime.

[0016] In one possible implementation, the method for determining the time Δtt required to reduce the steam extraction flow rate during the evening peak hours is as follows:

[0017] △tt=△F / FS;

[0018] Overall heating deficit Q during evening peak hours qr The method for determining it is as follows:

[0019] Q qr =△F×(△tt+△t) wf );

[0020] Wherein, △F is the adjustment reduction of the heating extraction steam flow rate during the evening peak period compared to the average heating extraction steam flow rate, and FS is the adjustment rate of the heating extraction steam flow rate.

[0021] In one possible implementation, the method for determining the rate of change FS of the heating steam extraction flow rate is as follows:

[0022] FS = Fw × 4.186 × TS / 2550;

[0023] Where TS is the rate of temperature change in the heating network, and Fw is the flow rate of the circulating water in the heating network.

[0024] In one possible implementation, the steam extraction flow rate Fn during the evening peak hours for heating... wf The method for determining it is as follows:

[0025] Fn wf =Fn ave -△F;

[0026] Wherein, △F represents the adjustment and reduction of the set peak evening heating steam extraction flow rate compared to the average heating steam extraction flow rate, and Fn ave This refers to the average steam extraction flow rate for heating units during the daytime.

[0027] In one possible implementation, the process for determining the maximum output characteristic function of the heating unit under different heating steam extraction flows in the condensing heating mode is as follows:

[0028] When the turbine steam inlet flow rate is maintained at the design steam inlet flow rate under the maximum continuous output condition, the maximum output value of the unit is obtained under different heating extraction steam flow rates.

[0029] Based on the maximum output value of the unit under different heating steam extraction flow rates, the maximum output characteristic function of the heating unit under different heating steam extraction flow rates in the condensing heating mode is obtained by fitting.

[0030] In one possible implementation, the process of determining the electrical output characteristic function of the heating unit under different heating steam extraction flows in the zero-output heating mode of the low-pressure cylinder is as follows:

[0031] When the steam flow rate of the low-pressure cylinder of the steam turbine is controlled at the minimum cooling steam flow rate determined by the manufacturer, the unit's electrical output value is obtained under different heating extraction steam flow rates.

[0032] Based on the unit's electrical output value under different heating steam extraction flow rates, the electrical output characteristic function under different heating steam extraction flow rates in the heating unit's low-pressure cylinder zero-output heating mode is obtained by fitting.

[0033] In one possible implementation, based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the maximum peak electrical output of the unit under the extraction-condensing heating mode during the evening peak, and the increase value of the maximum peak electrical output of the unit during the evening peak, a regulation strategy to enhance the peak electrical output of the heating unit is determined, including:

[0034] When the heating unit is in daytime, the unit operation is controlled by the low-pressure cylinder zero-output heating mode, based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during daytime.

[0035] When the heating unit is in the transition period from daytime to evening peak, based on the increase in the unit's stable electrical output under the low-pressure cylinder zero-output heating mode during the daytime and the unit's peak maximum electrical output during the evening peak, the unit's heating mode is switched from the low-pressure cylinder zero-output heating mode to the extraction condensing heating mode. The heating steam extraction flow rate is adjusted from the daytime heating steam extraction flow rate to the evening peak heating steam extraction flow rate. The unit output is adjusted from the stable electrical output under the low-pressure cylinder zero-output heating mode during the daytime to the unit's peak maximum electrical output under the extraction condensing heating mode during the evening peak.

[0036] When the heating unit is in the transition period from peak to evening peak, the unit operation is controlled by the extraction condensing heating mode based on the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak.

[0037] Secondly, embodiments of the present invention provide a regulating device for enhancing the peak power output of a heating unit, comprising:

[0038] The first determining module is used to determine the stable electric output of the unit under the low-pressure cylinder zero-output heating mode during the daytime based on the electric output characteristic function under different heating steam extraction flow rates under the low-pressure cylinder zero-output heating mode of the heating unit, and the maximum heating steam extraction flow rate during the daytime hours other than the evening peak hours.

[0039] The second determining module is used to determine the maximum peak power output of the unit under the extraction-condensation heating mode during the evening peak period, based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates and the heating steam extraction flow rate during the evening peak period, and to determine the increase value of the maximum peak power output of the unit during the evening peak period.

[0040] The strategy determination module is used to determine the adjustment strategy to enhance the peak power output of the heating unit based on the stable power output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the maximum peak power output of the unit under the extraction-condensing heating mode during the evening peak, and the increase value of the maximum peak power output of the unit during the evening peak.

[0041] This invention provides a method and apparatus for adjusting the peak electrical output of a heating unit. The method determines the stable electrical output of the unit under the daytime low-pressure cylinder zero-output heating mode by using the electrical output characteristic function under different heating extraction steam flow rates in the low-pressure cylinder zero-output heating mode, and the maximum heating extraction steam flow rate during daytime periods (excluding the evening peak). Then, based on the maximum output characteristic function under different heating extraction steam flow rates in the condensing extraction heating mode, and the heating extraction steam flow rate during the evening peak, the method determines the maximum peak electrical output of the unit during the evening peak during the condensing extraction heating mode, and the increase value of the maximum peak electrical output of the unit during the evening peak. Finally, based on the stable electrical output of the unit under the daytime low-pressure cylinder zero-output heating mode, the maximum peak electrical output of the unit under the evening peak condensing extraction heating mode, and the increase value of the maximum peak electrical output of the unit during the evening peak, the method determines an adjustment strategy to enhance the peak electrical output of the heating unit. By calculating the increase in peak maximum power output of heating units under the condition of reduced steam extraction flow rate during peak electricity consumption periods based on the operating constraints of the heating network, the peak maximum power output capacity of heating units during peak electricity consumption periods can be effectively improved, thereby enhancing the peak regulation flexibility and supply support capabilities of heating units. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a flowchart illustrating the implementation of the method for adjusting the peak power output of a heating unit according to an embodiment of the present invention.

[0044] Figure 2 This is a structural flowchart of the method for adjusting the peak power output of a heating unit provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the regulating device for enhancing peak power output of a heating unit provided in an embodiment of the present invention. Detailed Implementation

[0046] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0048] Figure 1 and Figure 2 The flowchart of the method for adjusting the peak electrical output of a heating unit according to an embodiment of the present invention is described in detail below:

[0049] S110. Based on the electrical output characteristic function of the heating unit under the zero-output heating mode of the low-pressure cylinder, under different heating steam extraction flow rates, and the maximum heating steam extraction flow rate during the daytime period except for the evening peak period, determine the corresponding stable electrical output of the unit under the zero-output heating mode of the low-pressure cylinder during the daytime period.

[0050] In some embodiments, the process for determining the electrical output characteristic function under different heating steam extraction flows in the zero-output heating mode of the low-pressure cylinder of the heating unit is as follows:

[0051] First, when the steam inlet flow rate of the low-pressure cylinder of the steam turbine is controlled at the minimum cooling steam flow rate determined by the manufacturer, the unit's electrical output value is obtained under different heating extraction steam flow rates.

[0052] Then, based on the unit's electrical output value under different heating steam extraction flow rates, the electrical output characteristic function under different heating steam extraction flow rates in the heating unit's low-pressure cylinder zero-output heating mode is fitted to obtain the electrical output characteristic function.

[0053] In this embodiment, the boundary condition for the zero-output heating mode of the low-pressure cylinder of the heating unit is that the steam inlet flow rate of the turbine's low-pressure cylinder is controlled at the minimum cooling steam flow rate determined by the manufacturer. The unit's electrical output values ​​under different heating extraction steam flow rates under this condition are summarized in a table and fitted as an electrical output characteristic function. The form of the electrical output characteristic function is:

[0054] P2 = a2 + b2 × Fn.

[0055] In some embodiments, the maximum steam extraction flow rate Fn for heating during daytime periods other than the evening peak period. rj for:

[0056] Fn rj =Fn ave +Q qr / (△t rj -△tt-△t wf );

[0057] Wherein, △t wf For evening rush hour, Q qr △tt represents the total heating deficit during the evening peak period, and △t represents the time required to adjust and reduce the steam extraction flow rate during the evening peak period. rj For the duration of the daytime period (8:00 AM to the end of the evening peak period), Fnave This refers to the average steam extraction flow rate for heating units during the daytime.

[0058] In some embodiments, Fn is selected in this invention. ave The average daytime steam extraction flow rate of the heating unit over three days is calculated as follows:

[0059]

[0060] Daytime hours are from 8:00 AM until the end of the evening peak hours.

[0061] The calculation process for the average heating steam extraction flow rate of a single-day heating unit during the daytime period (from 8:00 AM to the end of the evening peak period) is as follows:

[0062]

[0063] In the formula, F ni F represents the steam extraction flow rate for heating at 15-minute intervals, in t / h; n represents the total steam extraction flow rate for heating during the daytime period; nd(j) This represents the average steam extraction flow rate for heating during the daytime period on day j of the heating unit.

[0064] The total steam extraction flow rate TFn of the heating unit during the daytime heating period is:

[0065] TFn = Fn ave ×△t rj .

[0066] △t rj The duration of the daytime period (from 8:00 AM to the end of the evening peak period).

[0067] In this embodiment, the method for determining the time Δtt required to reduce the steam extraction flow rate during the evening peak hours is as follows:

[0068] △tt=△F / FS;

[0069] Overall heating deficit Q during evening peak hours qr The method for determining it is as follows:

[0070] Q qr =△F×(△tt+△t) wf );

[0071] Wherein, △F is the adjustment reduction of the heating extraction steam flow rate during the evening peak period compared to the average heating extraction steam flow rate, and FS is the adjustment rate of the heating extraction steam flow rate.

[0072] In this embodiment, the method for determining the adjustment rate FS of the heating steam extraction flow rate is as follows:

[0073] FS = Fw × 4.186 × TS / 2550;

[0074] Where TS is the rate of temperature change in the heating network, and Fw is the flow rate of the circulating water in the heating network.

[0075] In this embodiment, based on the electrical output characteristic function P2=a2+b2×Fn under different heating extraction steam flow rates in the low-pressure cylinder zero-output heating mode of the heating unit, the maximum heating extraction steam flow rate during the daytime period (excluding the evening peak period) can be substituted to calculate the corresponding stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime period.

[0076] S120. Based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates under the extraction-condensing heating mode, and the heating steam extraction flow rate during the evening peak period, determine the maximum peak electrical output of the unit under the extraction-condensing heating mode during the evening peak period, and determine the increase value of the maximum peak electrical output of the unit during the evening peak period.

[0077] In some embodiments, the process for determining the maximum output characteristic function under different heating steam extraction flows in the condensing heating mode of the heating unit is as follows:

[0078] First, when the turbine's steam inlet flow rate is maintained at the design steam inlet flow rate under the maximum continuous output condition, the maximum output value of the unit under different heating extraction steam flow rates can be obtained. Then, based on the maximum output value of the unit under different heating extraction steam flow rates, the maximum output characteristic function of the heating unit under the extraction-condensation heating mode under different heating extraction steam flow rates can be fitted.

[0079] In this embodiment, the boundary condition for the maximum output characteristic curve of the heating unit is that the steam turbine inlet flow rate is maintained at the design inlet flow rate under the maximum continuous output (TMCR) condition. The maximum output values ​​of the unit under different heating extraction steam flow rates under this condition are summarized in a table and fitted as the maximum output characteristic function Pmax1=a1+b1×Fn.

[0080] In some embodiments, the steam extraction flow rate Fn during the evening peak hours for heating wf The process of determining is as follows:

[0081] Fn wf =Fn ave -△F;

[0082] Wherein, △F represents the adjustment and reduction of the set peak evening heating steam extraction flow rate compared to the average heating steam extraction flow rate, and Fn ave This refers to the average steam extraction flow rate for heating units during the daytime.

[0083] In some embodiments, based on the maximum output characteristic function Pmax1=a1+b1×Fn under different heating extraction steam flow rates in the condensing heating mode of the heating unit, the peak maximum electrical output Pn of the unit under the condensing heating mode during the evening peak period can be calculated by substituting the heating extraction steam flow rate during the evening peak period. wf .

[0084] In some embodiments, the process for determining the increase in the maximum peak electrical output of the unit during the evening peak period is as follows:

[0085] First, determine the average peak maximum electrical output of the heating units during the evening peak period when no peak power output adjustment strategy is adopted. Next, based on the unit's peak maximum electrical output under the extraction-condensing heating mode during the evening peak period and the average peak maximum electrical output of the heating units during the evening peak period, determine the increase value of the unit's peak maximum electrical output during the evening peak period.

[0086] In this embodiment, the increase in the maximum peak electrical output of the unit during the evening peak period is calculated using the following formula:

[0087] △Pn wf =Pn wf -Pn wfave ;

[0088] Pn wfave Pn represents the average peak maximum electrical output of heating units during the evening peak hours over the past three days. wf This represents the maximum power output of the unit during the evening peak hours.

[0089] S130. Based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the peak maximum electrical output of the unit under the extraction condensing heating mode during the evening peak, and the increase value of the peak maximum electrical output of the unit during the evening peak, determine the adjustment strategy to enhance the peak electrical output of the heating unit.

[0090] In some embodiments, during the daytime hours (excluding evening peak hours and transitional periods), based on the stable electrical output of the unit under the daytime low-pressure cylinder zero-output heating mode, the unit operation will be controlled using the low-pressure cylinder zero-output heating mode, and the daytime heating extraction steam flow rate will be Fn. rj .

[0091] During the transition period from daytime to evening peak hours, based on the unit's stable electrical output under the daytime low-pressure cylinder zero-output heating mode and the increase in the unit's peak maximum electrical output during the evening peak hours, the rate of change of the unit's heating extraction steam flow rate is controlled as FS. The heating extraction steam flow rate is determined by the daytime heating extraction steam flow rate Fn. rj The adjustment is as follows: heating steam extraction flow rate Fn during evening peak hours wfThe unit output is adjusted from the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime to the maximum peak electrical output of the unit under the extraction-condensing heating mode during the evening peak hours.

[0092] During the transition period from the evening peak to the evening peak, based on the unit's peak maximum electrical output under the extraction-condensing heating mode during the evening peak, the unit operation is controlled using the extraction-condensing heating mode, and the extraction steam flow rate Fn during the evening peak is [not specified]. wf At this time, the maximum peak electrical output of the unit is Pn wf .

[0093] The adjustment method provided by this invention determines the stable electrical output of the heating unit under the low-pressure cylinder zero-output heating mode during the daytime period by using the electrical output characteristic function under different heating extraction steam flow rates in the low-pressure cylinder zero-output heating mode, and the maximum heating extraction steam flow rate during the daytime period excluding the evening peak period. Then, based on the maximum output characteristic function under different heating extraction steam flow rates in the condensing extraction heating mode, and the heating extraction steam flow rate during the evening peak period, the peak maximum electrical output of the unit during the evening peak period, and the increase value of the peak maximum electrical output of the unit during the evening peak period, are determined. Finally, based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime period, the peak maximum electrical output of the unit under the condensing extraction heating mode during the evening peak period, and the increase value of the peak maximum electrical output of the unit during the evening peak period, an adjustment strategy to enhance the peak electrical output of the heating unit is determined. By calculating the increase in peak maximum power output of heating units under the condition of reduced steam extraction flow rate during peak electricity consumption periods based on the operating constraints of the heating network, the peak maximum power output capacity of heating units during peak electricity consumption periods can be effectively improved, thereby enhancing the peak regulation flexibility and supply support capabilities of heating units.

[0094] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0095] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0096] Figure 3 A schematic diagram of the regulating device for enhancing peak electrical output of a heating unit according to an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0097] like Figure 3 As shown, a regulating device 300 for enhancing peak electrical output of a heating unit includes:

[0098] The first determining module 310 is used to determine the stable electric output of the unit under the low-pressure cylinder zero-output heating mode during the daytime based on the electric output characteristic function under different heating extraction steam flow rates under the low-pressure cylinder zero-output heating mode of the heating unit, and the maximum heating extraction steam flow rate during the daytime hours other than the evening peak hours.

[0099] The second determining module 320 is used to determine the maximum peak power output of the unit under the extraction-condensation heating mode during the evening peak period, based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates and the heating steam extraction flow rate during the evening peak period, and to determine the increase value of the maximum peak power output of the unit during the evening peak period.

[0100] The strategy determination module 330 is used to determine the adjustment strategy to enhance the peak power output of the heating unit based on the stable power output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the maximum peak power output of the unit under the extraction condensing heating mode during the evening peak, and the increase value of the maximum peak power output of the unit during the evening peak.

[0101] In one possible implementation, the second determining module 320 is used to determine the average value of the peak maximum power output during the evening peak period when the heating unit has not adopted the strategy of enhancing peak power output regulation.

[0102] Based on the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak period and the average value of the maximum peak electrical output of the heating unit during the evening peak period, the increase value of the maximum peak electrical output of the unit during the evening peak period is determined.

[0103] In one possible implementation, the maximum steam extraction flow rate Fn for heating during the daytime hours other than the evening peak period. rj The method for determining it is as follows:

[0104] Fn rj =Fn ave +Q qr / (△t rj -△tt-△t wf );

[0105] Wherein, △t wf For evening rush hour, Q qr △tt represents the total heating deficit during the evening peak period, △trj represents the time required to adjust and reduce the steam extraction flow rate during the evening peak period, and Fn represents the duration of the daytime period. ave This refers to the average steam extraction flow rate for heating units during the daytime.

[0106] In one possible implementation, the method for determining the time Δtt required to reduce the steam extraction flow rate during the evening peak hours is as follows:

[0107] △tt=△F / FS;

[0108] Overall heating deficit Q during evening peak hours qr The method for determining it is as follows:

[0109] Q qr =△F×(△tt+△t) wf );

[0110] Wherein, △F is the adjustment reduction of the heating extraction steam flow rate during the evening peak period compared to the average heating extraction steam flow rate, and FS is the adjustment rate of the heating extraction steam flow rate.

[0111] In one possible implementation, the method for determining the rate of change FS of the heating steam extraction flow rate is as follows:

[0112] FS = Fw × 4.186 × TS / 2550;

[0113] Where TS is the rate of temperature change in the heating network, and Fw is the flow rate of the circulating water in the heating network.

[0114] In one possible implementation, the steam extraction flow rate Fn during the evening peak hours for heating... wf The method for determining it is as follows:

[0115] Fn wf =Fn ave -△F;

[0116] Wherein, △F represents the adjustment and reduction of the set peak evening heating steam extraction flow rate compared to the average heating steam extraction flow rate, and Fn ave This refers to the average steam extraction flow rate for heating units during the daytime.

[0117] In one possible implementation, the second determining module 320 is used to obtain the maximum output value of the unit under different heating extraction steam flow rates when the steam turbine inlet steam flow rate is maintained at the design inlet steam flow rate under the maximum continuous output operating condition.

[0118] Based on the maximum output value of the unit under different heating steam extraction flow rates, the maximum output characteristic function of the heating unit under different heating steam extraction flow rates in the condensing heating mode is obtained by fitting.

[0119] In one possible implementation, the first determining module 310 is used to obtain the unit's electrical output value under different heating extraction steam flow rates when the steam flow rate of the low-pressure cylinder of the steam turbine is controlled at the minimum cooling steam flow rate determined by the manufacturer.

[0120] Based on the unit's electrical output value under different heating steam extraction flow rates, the electrical output characteristic function under different heating steam extraction flow rates in the heating unit's low-pressure cylinder zero-output heating mode is obtained by fitting.

[0121] In one possible implementation, the strategy module 330 is used to determine the heating mode with zero output of low-pressure cylinder based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime period when the heating unit is in the daytime period.

[0122] When the heating unit is in the transition period from daytime to evening peak, based on the increase in the unit's stable electrical output under the low-pressure cylinder zero-output heating mode during the daytime and the unit's peak maximum electrical output during the evening peak, the unit's heating mode is switched from the low-pressure cylinder zero-output heating mode to the extraction condensing heating mode. The heating steam extraction flow rate is adjusted from the daytime heating steam extraction flow rate to the evening peak heating steam extraction flow rate. The unit output is adjusted from the unit's stable electrical output under the low-pressure cylinder zero-output heating mode during the daytime to the unit's peak maximum electrical output under the extraction condensing heating mode during the evening peak.

[0123] When the heating unit is in the transition period from peak to evening peak, the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak will be adopted.

[0124] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0125] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0126] If the module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above embodiments of the method for adjusting the peak power output of each heating unit. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for adjusting the peak electrical output of a heating unit, characterized in that, include: Based on the power output characteristic function of the heating unit under the zero-output heating mode of the low-pressure cylinder, under different heating steam extraction flow rates, and the maximum heating steam extraction flow rate during the daytime period except for the evening peak period, the corresponding stable power output of the unit under the zero-output heating mode of the low-pressure cylinder during the daytime period is determined. Based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates under the extraction-condensation heating mode, and the heating steam extraction flow rate during the evening peak period, the maximum peak power output of the unit under the extraction-condensation heating mode during the evening peak period is determined, as well as the increase value of the maximum peak power output of the unit during the evening peak period is determined. Based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime, the maximum peak electrical output of the unit under the extraction-condensing heating mode during the evening peak, and the increase value of the maximum peak electrical output of the unit during the evening peak, the adjustment strategy for enhancing the peak electrical output of the heating unit is determined.

2. The method for adjusting the peak power output of a heating unit according to claim 1, characterized in that, The determination of the increase in the maximum peak power output of the unit during the evening peak period includes: Determine the average peak maximum power output of the heating unit during the evening peak period when no peak power output regulation strategy is adopted; Based on the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak period and the average value of the maximum peak electrical output of the heating unit during the evening peak period, the increase value of the maximum peak electrical output of the unit during the evening peak period is determined.

3. The method for adjusting the peak power output of a heating unit according to claim 1, characterized in that, The maximum steam extraction flow rate Fn for heating during daytime hours other than the evening peak period. rj The method for determining it is as follows: Fn rj =Fn ave +Q qr / (△t rj -△tt-△t wf ); Wherein, △t wf For evening rush hour, Q qr The total heating deficit during the evening peak period is represented by △tt, which is the time required to adjust and reduce the steam extraction flow rate during the evening peak period. △trj is the duration of the daytime period. Fn ave This refers to the average steam extraction flow rate for heating units during the daytime.

4. The method for adjusting the peak power output of a heating unit according to claim 3, characterized in that, The method for determining the time Δtt required to adjust and reduce the steam extraction flow rate during the evening peak hours is as follows: △tt=△F / FS; Overall heating deficit Q during evening peak hours qr The method for determining it is as follows: Q qr =△F×(△tt+△t wf ); Wherein, △F is the adjustment reduction of the heating extraction steam flow rate during the evening peak period compared to the average heating extraction steam flow rate, and FS is the adjustment rate of the heating extraction steam flow rate.

5. The method for adjusting the peak power output of a heating unit according to claim 4, characterized in that, The method for determining the rate of change FS of the heating steam extraction flow rate is as follows: FS = Fw × 4.186 × TS / 2550; Where TS is the rate of temperature change in the heating network, and Fw is the flow rate of the circulating water in the heating network.

6. The method for adjusting the peak power output of a heating unit according to claim 1, characterized in that, The steam extraction flow rate Fn during the evening peak period wf The method for determining it is as follows: UN wf =Fn ave -△F; Wherein, △F represents the adjustment and reduction of the set peak evening heating steam extraction flow rate compared to the average heating steam extraction flow rate, and Fn ave This refers to the average steam extraction flow rate for heating units during the daytime.

7. The method for adjusting the peak electrical output of a heating unit according to any one of claims 1-6, characterized in that, The process for determining the maximum output characteristic function of the heating unit under different heating steam extraction flow rates in the extraction-condensation heating mode is as follows: When the turbine steam inlet flow rate is maintained at the design steam inlet flow rate under the maximum continuous output condition, the maximum output value of the unit is obtained under different heating extraction steam flow rates. Based on the maximum output value of the unit under different heating steam extraction flow rates, the maximum output characteristic function of the heating unit under different heating steam extraction flow rates in the condensing heating mode is obtained by fitting.

8. The method for adjusting the peak power output of a heating unit according to any one of claims 1-6, characterized in that, The process for determining the electrical output characteristic function of the heating unit under different heating steam extraction flows in the low-pressure cylinder zero-output heating mode is as follows: When the steam flow rate of the low-pressure cylinder of the steam turbine is controlled at the minimum cooling steam flow rate determined by the manufacturer, the unit's electrical output value is obtained under different heating extraction steam flow rates. Based on the unit's electrical output values ​​under different heating steam extraction flows, the electrical output characteristic function under different heating steam extraction flows in the low-pressure cylinder zero-output heating mode of the heating unit is fitted to obtain the electrical output characteristic function.

9. The method for adjusting the peak electrical output of a heating unit according to any one of claims 1-6, characterized in that, The method for determining the adjustment strategy to enhance the peak power output of the heating unit based on the stable power output of the unit under the daytime low-pressure cylinder zero-output heating mode, the peak maximum power output of the unit under the evening peak condensing heating mode, and the increase value of the peak maximum power output of the unit during the evening peak period includes: When the heating unit is in daytime, the unit operation is controlled by the low-pressure cylinder zero-output heating mode based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime. When the heating unit is in the transition period from daytime to evening peak, based on the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime and the increase value of the unit's peak maximum electrical output during the evening peak, the heating mode of the unit is switched from the low-pressure cylinder zero-output heating mode to the extraction condensing heating mode. The steam extraction flow rate for heating is adjusted from the steam extraction flow rate during the daytime heating mode to the steam extraction flow rate during the evening peak. The unit output is adjusted from the stable electrical output of the unit under the low-pressure cylinder zero-output heating mode during the daytime to the unit's peak maximum electrical output under the extraction condensing heating mode during the evening peak. When the heating unit is in the transition period from peak to evening peak, the unit operation is controlled by the extraction condensing heating mode based on the maximum peak electrical output of the unit under the extraction condensing heating mode during the evening peak period.

10. A regulating device for enhancing peak power output of a heating unit, characterized in that, include: The first determining module is used to determine the stable electric output of the unit under the low-pressure cylinder zero-output heating mode during the daytime based on the electric output characteristic function under different heating steam extraction flow rates under the low-pressure cylinder zero-output heating mode of the heating unit, and the maximum heating steam extraction flow rate during the daytime hours other than the evening peak hours. The second determining module is used to determine the maximum peak power output of the unit under the extraction-condensation heating mode during the evening peak period, based on the maximum output characteristic function of the heating unit under different heating steam extraction flow rates and the heating steam extraction flow rate during the evening peak period, and to determine the increase value of the maximum peak power output of the unit during the evening peak period. The strategy determination module is used to determine the adjustment strategy for enhancing the peak power output of the heating unit based on the stable power output of the unit under the low-pressure cylinder zero-output heating mode during the daytime period, the maximum peak power output of the unit under the extraction-condensing heating mode during the evening peak period, and the increase value of the maximum peak power output of the unit during the evening peak period.

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