Optimization method and system for meeting power supply demand in heating season based on electric-heat coordination

Abstract

The present invention proposes an optimization method and system for meeting the power supply demand during the heating season based on electric-thermal coordination, including: obtaining the average heat load of the units in the region during the heating season when the output is reduced, including the heating steam extraction volume and the industrial steam extraction volume; calculating the theoretical output upper limit of the unit based on the actual heat load of the unit, comparing the theoretical output upper limit of the unit with the actual output upper limit of the unit; if the actual output upper limit of the unit is less than the theoretical output upper limit, checking the peak output capacity of the unit, in addition to being restricted by the heat load, if there are no other reasons, scheduling according to the theoretical output upper limit. Under the premise of not affecting the heating comfort of users, the peak output capacity of the unit can be temporarily increased, which has practical value for optimizing the scheduling and operation of the power grid.

Description

Technical Field

[0001] The present invention belongs to the technical field of optimizing power grid dispatching, and in particular relates to an optimization method and system for meeting the power supply demand during the heating season based on electric-heat coordination. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Balancing electricity supply and demand is challenging due to factors such as declining coal-fired power generation willingness, significantly increased uncertainty in external power, and insufficient peak-load capacity from renewable energy sources. The ability of thermal power units to adjust their load is significantly constrained by the amount of heat they can supply. Facing the dual pressures of peak electricity demand and peak heat supply, thermal power units are forced to further increase and reduce output to meet heat demand.

[0004] For urban heating, the demand for heating is generally higher at night and lower during the day. If a constant heat supply is adopted, heat will be wasted during the day, and insufficient heat will be supplied at night, affecting the heating experience of heat users. Therefore, power plants reduce the heat supply during the day and gradually increase the heat supply in the evening. However, this will lead to a reduction in the power plant output and will be unable to meet the peak-shaving demand of the power grid during the evening peak. Summary of the Invention

[0005] In order to overcome the shortcomings of the above-mentioned existing technologies, the present invention provides an optimization method based on electric and thermal coordination to meet the power supply demand in the heating season. Without additional technical transformation and increasing costs, it meets the peak output demand of the power grid during the evening peak, which plays a positive role in ensuring the smooth and orderly supply of electric energy.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0007] First, an optimization method for meeting the power supply demand during the heating season based on electric-heat coordination is disclosed, including:

[0008] Obtain the average heat load of the units in the region during the reduced output period during the heating season, including heating steam extraction and industrial steam extraction;

[0009] According to the actual thermal load of the unit, the theoretical output upper limit of the unit is calculated and compared with the actual reported output upper limit of the unit. If it is less than the theoretical output upper limit, the power grid dispatching department will further check the peak output capacity of the unit. If there are no other reasons other than the thermal load constraint, the unit will be dispatched according to the theoretical output upper limit.

[0010] As a further technical solution, based on the actual heat load of the unit, if the heat load of the unit is only the heating heat load, according to the average heating steam extraction volume during the unit's output reduction period in the area, the mathematical relationship between the unit's output upper limit and the heating steam extraction volume is fitted through the heating condition diagram, and based on the mathematical relationship, the theoretical output upper limit under the current heating steam extraction volume is obtained.

[0011] As a further technical solution, based on the actual heat load of the unit, if the heat load of the unit includes both heating heat load and industrial heat load, the theoretical output upper limit value under the current heating steam extraction volume is first calculated, and then the corresponding industrial steam extraction upper limit correction coefficient is calculated according to different industrial steam extraction positions, and finally the theoretical output upper limit value under the current heating steam extraction volume and industrial steam extraction volume is output.

[0012] As a further technical solution, the heating operating condition diagram is a coupling relationship diagram of the main steam flow, heating steam extraction volume and active power;

[0013] There is a theoretical output upper limit corresponding to each heating steam extraction volume. Based on different heating steam extraction volumes and corresponding theoretical output upper limits, a thermoelectric relationship curve is generated and a mathematical relationship between the unit output upper limit and the heating steam extraction volume is fitted.

[0014] As a further technical solution, the corresponding industrial steam extraction upper limit correction coefficient is calculated according to different industrial steam extraction positions. Specifically:

[0015] The output upper limit correction coefficient y1 of the extraction position before the reheating cold section:

[0016] y1 = (h - low pressure cylinder exhaust enthalpy + reheat hot section enthalpy - reheat cold section enthalpy) / 3600

[0017] The output upper limit correction coefficient y2 of the extraction position in the reheat cold section:

[0018] y2 = (reheating hot section enthalpy - low pressure cylinder exhaust enthalpy) / 3600

[0019] Output upper limit correction coefficient y3 when the extraction position is in the reheating hot section or after the reheating hot section:

[0020] y3=(h-low-pressure cylinder exhaust enthalpy) / 3600

[0021] Where: h is the extraction enthalpy corresponding to the actual extraction position of the unit. The enthalpy values ​​at different positions mentioned above can be obtained by querying the steam-water enthalpy-entropy diagram through the pressure and temperature corresponding to the position.

[0022] As a further technical solution, the upper limit of the theoretical output of the unit under the consideration of heating and industrial heat loads is calculated as follows:

[0023] P 总=P-y1*t1-y2*t2-y3*t3

[0024] Where: P 总 To consider the upper limit of the theoretical output of the unit under heating and industrial heat loads, P is the upper limit of the theoretical output under heating heat load, t1, t2, and t3 are the industrial steam extraction capacities corresponding to different steam extraction positions, and the actual industrial steam extraction capacities of the unit can be obtained by querying DCS data.

[0025] As a further technical solution, if the actual output upper limit of the unit cannot maintain the theoretical output upper limit due to the actual situation of the unit, the measures that can be adopted include:

[0026] Without changing the heating network parameters, directly reduce the heating steam extraction of the unit. Based on the delay and attenuation characteristics of the heating network and with the minimum room temperature standard of residents as the constraint condition, "reducing heating and increasing electricity" can be achieved in a short time to improve the peak output capacity of the unit without affecting the heating comfort of users; or

[0027] Adjust the heating temperature of the primary heating network. Before the peak hours of electricity and heating, increase the heating steam extraction volume in advance to improve the heat storage capacity of the heating network system. During the peak hours of electricity consumption, temporarily reduce the heating steam extraction volume to increase the peak output capacity of the unit without affecting the heating comfort of users; or

[0028] Adjust the circulating water volume of the primary heating network. Before the peak electricity and heating hours, increase the circulating water volume of the heating network in advance to improve the heat storage capacity of the heating network system. During the peak electricity consumption hours, reduce the heating steam extraction volume for a short time to improve the peak output capacity of the unit without affecting the heating comfort of the users.

[0029] Secondly, an optimization system for meeting the power supply demand during the heating season based on electric and thermal coordination is disclosed, including:

[0030] The heat load acquisition module is configured to: obtain the average heat load of the units in the region during the reduced output period during the heating season, including the heating steam extraction volume and the industrial steam extraction volume;

[0031] The scheduling module is configured to calculate the theoretical output upper limit of the unit based on the actual heat load of the unit, and compare it with the actual reported output upper limit of the unit. If it is less than the theoretical output upper limit, check whether the peak output capacity of the unit is restricted by the heat load. If there is no other reason, the unit will be scheduled according to the theoretical output upper limit.

[0032] One or more of the above technical solutions have the following beneficial effects:

[0033] Because the heating network system has a certain thermal inertia, lowering the heating temperature in a short period of time will not affect the user's heating experience. If the peak-valley differences of the power grid and the demand for new energy consumption are combined in the power grid dispatching, the thermal inertia of the heating network can be used to reduce the heating supply in a short period of time, and the thermal power units can be "reduced heat and increased electricity". Without additional technical transformation and increasing costs, it can meet the peak output demand of the power grid during the evening peak, which has a positive effect on ensuring the smooth and orderly supply of electric energy.

[0034] The present invention starts with studying the coupling relationship between the output of thermal power units and heat supply, forms a thermal-electric relationship curve and fits the mathematical relationship between the upper limit of the unit output and the heat load, judges the rationality of the unit's output reduction request, and verifies the unit's actual output level; further proposes several technical measures to utilize the characteristics of the thermal network to achieve "reducing heat and increasing electricity" during peak electricity consumption hours, provides a reference basis for the output reduction assessment in the "two detailed rules", and effectively improves the peak output capacity of the entire network.

[0035] This invention rationally evaluates the rationality of the power reduction demands of thermal power units and optimizes the coordinated operation mode of electricity and heat, providing data support for the grid dispatching department to issue dispatching instructions, improving the winter power supply capability and assisting in the construction of new power systems. It has very broad application prospects.

[0036] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] Figure 1 This is a heating operating diagram of a unit according to an embodiment of the present invention;

[0039] Figure 2 This is a diagram showing the fitting formula of the thermoelectric relationship curve of a unit according to an embodiment of the present invention;

[0040] Figure 3 The figure is a flow chart of improving the peak output capacity of a unit based on electric and thermal coordination according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0042] It should be noted that the terms used herein are for describing particular embodiments only and are not intended to limit the exemplary embodiments according to the present invention.

[0043] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0044] Example 1

[0045] This embodiment discloses an optimization method for meeting the power supply demand during the heating season based on electric and thermal coordination. It addresses the problem of thermal power units being unable to meet power supply demand during peak heating periods due to reduced output due to thermal load. Starting from the electric and thermal characteristics of thermal power units, the present invention first evaluates the rationality of the unit's output reduction request. In view of the output obstruction of some thermal power units due to thermal load constraints, several technical measures are proposed based on the actual situation of the units to achieve "reducing heat and increasing electricity" during peak electricity consumption periods by utilizing the characteristics of the thermal network. This effectively improves the peak output capacity of the entire network and has practical value for optimizing grid dispatching and operation.

[0046] For specific examples, see the attached Figure 3 As shown, the following steps are included:

[0047] Step 1: Determine the output reduction of thermal power units in the region, clarify the reasons for the unit output reduction, and calculate the average heat load of the units during the heating season, including the heating steam extraction volume and industrial steam extraction volume.

[0048] Step 2: If the unit's heat load is only heating heat load, calculate the average heating steam extraction volume of the unit during the output reduction period according to step 1, fit the mathematical relationship between the unit's output upper limit and the heating steam extraction volume through the heating condition diagram, input the heating steam extraction volume, and output the theoretical output upper limit value under the current heating steam extraction volume.

[0049] The heating operating diagram shows the coupled relationship between main steam flow, heating extraction, and active power. Each heating extraction has a theoretical output limit. By inputting different heating extractions and their corresponding theoretical output limits into Excel, a thermoelectric relationship curve is generated, and a mathematical equation is fitted to determine the relationship between the unit's output limit and the heating extraction.

[0050] Step 3: If the unit's heat load includes both heating heat load and industrial heat load, first calculate the theoretical output upper limit under the current heating steam extraction volume according to step 2, then calculate the corresponding industrial steam extraction upper limit correction coefficient according to different industrial steam extraction positions, and finally output the theoretical output upper limit under the current heating steam extraction volume and industrial steam extraction volume.

[0051] in,

[0052] Industrial extraction steam correction 1: The upper limit correction coefficient y1 of the extraction steam position before the reheating cold section:

[0053] y1=(h-low pressure cylinder exhaust enthalpy+reheat hot section enthalpy-reheat cold section enthalpy) / 3600 (1)

[0054] Industrial extraction steam correction 2: The upper limit correction coefficient y2 of the extraction steam position in the reheating cold section:

[0055] y2=(reheating hot section enthalpy - low pressure cylinder exhaust enthalpy) / 3600 (2)

[0056] Industrial extraction steam correction 3: The upper limit correction coefficient y3 for the extraction steam position in the reheating hot section or after the reheating hot section:

[0057] y3=(h-low pressure cylinder exhaust enthalpy) / 3600 (3)

[0058] Where: h is the extraction enthalpy corresponding to the actual extraction position of the unit. The enthalpy values ​​at different positions mentioned above can be obtained by querying the steam-water enthalpy-entropy diagram through the pressure and temperature corresponding to the position.

[0059] The calculation formula for the upper limit of the theoretical output of the unit considering heating and industrial heat loads is as follows:

[0060] P 总 =P-y1*t1-y2*t2-y3*t3 (4)

[0061] Where: P 总 To consider the upper limit of the theoretical output of the unit under heating and industrial heat loads, P is the upper limit of the theoretical output under heating heat load, t1, t2, and t3 are the industrial steam extraction capacities corresponding to different steam extraction positions, and the actual industrial steam extraction capacities of the unit can be obtained by querying DCS data.

[0062] Step 4: Based on the actual thermal load of the unit, use step 2 or 3 to calculate the theoretical output upper limit of the unit, and compare it with the actual reported output upper limit of the unit. If it is less than the theoretical output upper limit, the grid dispatching department will further check the peak output capacity of the unit. If there are no other reasons other than the thermal load constraint, the unit will be dispatched according to the theoretical output upper limit.

[0063] Step 5: If the actual output upper limit value in step 4 is greater than or equal to the theoretical output upper limit value, the actual output of the unit has reached the maximum theoretical peak output value of the unit.

[0064] Step 6: If the actual output limit of the unit cannot maintain the theoretical output limit due to the actual situation of the unit, several technical measures can be proposed based on the actual situation of the unit to achieve "heat reduction and power increase" by utilizing the characteristics of the heating network, thereby temporarily improving the peak output capacity of the unit;

[0065] Step 7: Method 1: Directly reduce the unit's heating steam extraction without changing the heating network parameters. Based on the heating network's delay and decay characteristics, and subject to the minimum residential room temperature standard, this approach achieves a "heat reduction and power increase" approach to boost the unit's peak output capacity in a short period of time without compromising user heating comfort.

[0066] Step 8: Method 2: Adjust the primary heating network's heating temperature. Before peak electricity and heating demand times, increase the heating steam extraction rate in advance to improve the network's heat storage capacity. During peak electricity demand times, temporarily reduce the heating steam extraction rate to increase the unit's peak output capacity without affecting user heating comfort.

[0067] Step 9: Method 3: Adjust the primary heating network circulating water volume. Before peak electricity and heating times, increase the circulating water volume in the heating network to improve the system's heat storage capacity. During peak electricity demand, temporarily reduce heating steam extraction to increase the unit's peak output capacity without affecting user heating comfort.

[0068] The constraints in steps 7 to 9 above are:

[0069] T min ≤T k,t ≤T max (5)

[0070] T k,t -T k,t-1 ≤T (6)

[0071] Where: T min and T max The upper and lower limits of indoor temperatures for winter residential use are 16°C, respectively. The minimum design temperature for indoor heating in northern my country is 16°C. This means that with 18°C ​​as the base temperature, a fluctuation of 2°C above or below, meaning that temperatures between 16°C and 20°C, meet the heating standard. T represents the maximum allowable indoor temperature change within a certain time interval.

[0072] The terminal temperature of the heating network (equivalent to the indoor temperature of the building) corresponding to the time t in the constraints of steps 7 to 9 above is:

[0073] T k,t =T s,t (tt p )-Δt1 (7)

[0074]

[0075]

[0076] Where: T k,t 、T s,t is the temperature at the end and the beginning of the heating network at time t, Δt1 is the temperature drop of the heating network, k is the temperature loss coefficient, is the ambient temperature corresponding to time t, c is the specific heat capacity of the heating medium, and λ is the heat transfer coefficient per unit length of the heating network.

[0077] The calculation formula for the thermal inertia time constant based on the delay and attenuation characteristics of the heating network in the constraints of steps 7 to 9 above is as follows:

[0078]

[0079] Where: t p is the thermal inertia time constant of the heating network, ρ is the specific heat capacity of the medium in the heating network, l is the length of the heating network, d is the inner diameter of the heating network, and m is the flow rate of the heating network.

[0080] The operation adjustment methods of steps 7 to 9 above can be selected according to the actual situation of the unit. The adjustment method in step 7 is simple and easy, and can improve the peak capacity of the unit outside the regular scheduling high-load period; the adjustment methods in steps 8 and 9 are higher and longer than those in step 7 in improving the peak output of the unit. This method can be used to improve the peak output capacity of the unit before the regular peak electricity consumption time (for example: after 17:00 on the same day) during the heating season.

[0081] In order to better illustrate the above solution, a specific engineering case is given below:

[0082] A power plant currently has two 330MW subcritical coal-fired generating units. Both units have completed the transformation of connecting pipe steam extraction for heating. The steam extraction location is the exhaust of the intermediate pressure cylinder. The heat load of the unit is only the heating heat load. The designed external steam supply pressure is 0.8MPa and the temperature is 330℃. The rated steam extraction capacity of a single unit is 280t / h and the maximum steam extraction capacity is 300t / h.

[0083] The power plant applied for a power reduction due to winter heating from November 19 to December 31, 2021, and declared that the upper limit of the adjustable capacity of the entire plant was 500,000 kilowatts, and the blocked capacity was 160,000 kilowatts.

[0084] Table 1 Application for power reduction of a power plant

[0085]

[0086] The proposed optimization method for meeting the power supply demand during the heating season based on electric-heat coordination first evaluates the rationality of the power reduction request, and then uses the characteristics of the heating network to achieve "reducing heating and increasing power" during peak power consumption periods, thereby temporarily increasing the peak power output capacity of the units without affecting the heating comfort of users. The electric-heat coordination optimization method for this plant includes the following steps:

[0087] Step 1: Record the average heating steam extraction volume in the higher load section of the entire plant during the period when the unit is reduced in output, as shown in Table 2;

[0088] Table 2 Thermal load of units in the higher load section of a power plant during the power reduction period

[0089] 2021 / 12 / 27 #1 unit heating steam extraction capacity (t / h) #2 unit heating steam extraction capacity (t / h) Plant heating steam extraction capacity (t / h) 16:45 262.23 259.70 521.93 16:50 259.33 254.12 513.45 16:55 256.15 249.80 505.95 17:00 245.80 244.12 489.92 17:05 243.80 243.80 487.60 17:10 245.60 243.00 488.60 17:15 240.40 238.40 478.80 17:20 239.40 237.40 476.80 17:25 228.40 230.50 458.90 17:30 222.50 228.30 450.80 17:35 222.90 225.50 448.40 17:40 219.80 217.20 437.00 17:45 216.69 216.60 433.29 average value 238.69 237.57 476.26

[0090] Step 2: According to step 1, the average heating steam extraction capacity of the whole plant is 476.26t / h. Figure 1 The mathematical relationship between the upper limit of the unit output and the amount of steam extracted for heating is fitted in the heating condition diagram. Figure 2 Input the average heating steam extraction volume of the two units in the current time period respectively, and output the theoretical output upper limit of the whole plant calculated at the current heating steam extraction volume after correction according to the main steam flow rate under TRL conditions, which is 526.5MW.

[0091] Step 3: The theoretical output upper limit calculated after correction based on the main steam flow calculated according to the TRL operating conditions in step 2 is greater than the adjustable upper limit reported by the entire plant, indicating that the unit's application for output reduction is unreasonable; further field tests are conducted to verify the actual effects of several technical measures that utilize the characteristics of the heating network to achieve "heat reduction and power increase", and to verify whether the unit can maintain the theoretical output upper limit for scheduling.

[0092] Step 4: Field trials verified the effectiveness of Method 1 by directly reducing the unit's heating steam extraction without changing the heating network parameters. Based on the network's delay and decay characteristics, and subject to the minimum residential room temperature standard of 18°C, this approach achieved a "heat reduction and power increase" approach to boost the unit's peak output capacity in a short period of time without compromising user heating comfort.

[0093] Step 5: Field trials verify the effectiveness of Method 2 and adjust the primary heating network's heating temperature. Before peak electricity and heating demand times, increase heating steam extraction to enhance the network's thermal storage capacity. During peak electricity demand times, temporarily reduce heating steam extraction to increase the unit's peak output without impacting user heating comfort.

[0094] Step 6: Field tests verify the effectiveness of Method 3 and adjust the primary heating network circulating water volume. Before peak electricity and heating times, increase the circulating water volume to enhance the system's heat storage capacity. During peak electricity demand, temporarily reduce heating steam extraction to increase the unit's peak output without compromising user heating comfort.

[0095] Step 7: Through the on-site operation adjustment test of the unit, it was found that adjusting the primary heating network heating temperature of the three methods from Steps 4 to 6 had the best effect on improving the peak output capacity of the unit. At an average plant load of 526.89MW, the unit could maintain stable operation for more than 1 hour. The specific results of the on-site test are shown in Tables 3 and 4 below:

[0096] Table 3 Operation status of each unit during the operation adjustment test of a power plant

[0097]

[0098] Table 4 Operation status of a power plant during the operation adjustment test

[0099]

[0100]

[0101] Using the above method, the comparison of the total peak load upper limit of the whole plant before and after optimization is shown in Table 5:

[0102] Table 5 Comparison of the upper and lower limits of the total peak load regulation of the whole plant before and after optimization

[0103] Whole factory Peak load limit (MW) Before optimization 500 After optimization 526.89

[0104] As can be seen from Table 5, the method proposed in this invention enables the grid dispatching department to evaluate the rationality of the power output reduction request, and further utilizes the characteristics of the heating network to achieve "heat reduction and power increase" during the evening peak. Without affecting the heating comfort of users, the peak output capacity of the unit can be temporarily increased, which has practical value for optimizing grid dispatching operations.

[0105] Example 2

[0106] The purpose of this embodiment is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0107] Example 3

[0108] The purpose of this embodiment is to provide a computer-readable storage medium.

[0109] A computer-readable storage medium stores a computer program, which, when executed by a processor, performs the steps of the above method.

[0110] Example 4

[0111] The purpose of this embodiment is to provide an optimization system based on electric-heat coordination to meet the power supply demand during the heating season, including:

[0112] The heat load acquisition module is configured to: obtain the average heat load of the units in the region during the reduced output period during the heating season, including the heating steam extraction volume and the industrial steam extraction volume;

[0113] The scheduling module is configured to calculate the theoretical output upper limit of the unit based on the actual heat load of the unit, and compare it with the actual reported output upper limit of the unit. If it is less than the theoretical output upper limit, check whether the peak output capacity of the unit is restricted by the heat load. If there is no other reason, the unit will be scheduled according to the theoretical output upper limit.

[0114] The steps involved in the apparatuses of Examples 2, 3, and 4 above correspond to those of Method Example 1. For detailed implementations, please refer to the relevant description of Example 1. The term "computer-readable storage medium" should be understood to mean a single medium or multiple media containing one or more instruction sets; it should also be understood to include any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and causing the processor to perform any method of the present invention.

[0115] Those skilled in the art will appreciate that the modules or steps of the present invention described above can be implemented using a general-purpose computer device. Alternatively, they can be implemented using program code executable by a computing device, which can then be stored in a storage device and executed by the computing device. Alternatively, they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0116] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. An optimization method based on electric-heat coordination to meet the power supply demand in the heating season is characterized by: include: Obtain the average heat load of the units in the region during the reduced output period during the heating season, including heating steam extraction and industrial steam extraction; Calculate the theoretical upper limit of the unit's output based on the unit's actual heat load. If the unit's heat load is solely heating, calculate the mathematical relationship between the unit's output upper limit and the heating steam extraction volume using the heating condition diagram, based on the average heating steam extraction volume during the unit's reduced output period in the region. Based on this mathematical relationship, determine the theoretical upper limit of the unit's output under the current heating steam extraction volume. If the unit's heat load includes both heating and industrial heat loads, the theoretical output upper limit under the current heating steam extraction volume is first calculated. Then, the corresponding industrial steam extraction upper limit correction coefficient is calculated based on different industrial steam extraction locations. Finally, the theoretical output upper limit under the current heating steam extraction volume and industrial steam extraction volume is output. The corresponding industrial steam extraction upper limit correction coefficient is calculated according to different industrial steam extraction positions, which is characterized in that the output upper limit correction coefficient y1 of the steam extraction position before the reheating cold section is: y1=(h-low pressure cylinder exhaust enthalpy+reheat hot section enthalpy-reheat cold section enthalpy) / 3600 The output upper limit correction coefficient y2 of the extraction position in the reheat cold section: y2=(reheating hot section enthalpy-low pressure cylinder exhaust enthalpy) / 3600 Output upper limit correction coefficient y3 when the extraction position is in the reheating hot section or after the reheating hot section: y3=(h-low pressure cylinder exhaust enthalpy) / 3600 Where: h is the extraction enthalpy corresponding to the actual extraction position of the unit. The enthalpy values ​​at different positions can be obtained by querying the steam-water enthalpy-entropy diagram based on the pressure and temperature corresponding to the position; Compare the theoretical output upper limit of the unit with the actual reported output upper limit of the unit. If the actual reported output upper limit of the unit is less than the theoretical output upper limit, check the peak output capacity of the unit. If there is no other reason other than the heat load restriction, dispatch according to the theoretical output upper limit.

2. The optimization method for meeting the power supply demand in the heating season based on electric-heat coordination according to claim 1 is characterized in that: The heating operating condition diagram is a coupling relationship diagram of the main steam flow, heating steam extraction volume and active power; There is a theoretical output upper limit corresponding to each heating steam extraction volume. Based on different heating steam extraction volumes and corresponding theoretical output upper limits, a thermoelectric relationship curve is generated and a mathematical relationship between the unit output upper limit and the heating steam extraction volume is fitted.

3. The optimization method for meeting the power supply demand in the heating season based on electric-heat coordination according to claim 1, characterized in that: The calculation formula for the upper limit of the theoretical output of the unit considering heating and industrial heat loads is as follows: Ptotal=P-y1*t1-y2*t2-y3*t3 Where: Ptotal is the theoretical output upper limit of the unit considering heating and industrial heat loads, P is the theoretical output upper limit considering heating heat load, t1, t2, and t3 are the industrial steam extraction capacities corresponding to different steam extraction positions, and the actual industrial steam extraction capacities of the unit can be obtained by querying DCS data.

4. The optimization method for satisfying the power supply demand in the heating season based on electric-heat coordination according to any one of claims 1 to 3, characterized in that: include: If the actual output limit of the unit cannot maintain the theoretical output limit due to the actual situation of the unit, the measures that can be adopted include: Without changing the heating network parameters, directly reduce the heating steam extraction of the unit. Based on the delay and attenuation characteristics of the heating network and with the minimum room temperature standard of residents as the constraint condition, "reducing heating and increasing electricity" can be achieved in a short period of time to improve the peak output capacity of the unit without affecting the heating comfort of users; or Adjust the heating temperature of the primary heating network. Before the peak hours of electricity and heating, increase the heating steam extraction volume in advance to improve the heat storage capacity of the heating network system. During the peak hours of electricity consumption, temporarily reduce the heating steam extraction volume to increase the peak output capacity of the unit without affecting the heating comfort of users; or Adjust the circulating water volume of the primary heating network. Before the peak electricity and heating hours, increase the circulating water volume of the heating network in advance to improve the heat storage capacity of the heating network system. During the peak electricity consumption hours, reduce the heating steam extraction volume for a short time to improve the peak output capacity of the unit without affecting the heating comfort of the users.

5. An optimization system based on electric and heat coordination to meet the power supply demand during the heating season is characterized by: include: The heat load acquisition module is configured to: obtain the average heat load of the units in the region during the reduced output period during the heating season, including the heating steam extraction volume and the industrial steam extraction volume; The scheduling module is configured to: calculate the theoretical output upper limit of the unit according to the actual heat load of the unit; if the heat load of the unit is only the heating heat load, based on the average heating steam extraction during the period of reduced output of the unit in the area, fit the mathematical relationship between the unit output upper limit and the heating steam extraction through the heating condition diagram, and obtain the theoretical output upper limit under the current heating steam extraction based on the mathematical relationship; if the heat load of the unit includes both heating heat load and industrial heat load, first calculate the theoretical output upper limit under the current heating steam extraction, then calculate the corresponding industrial steam extraction upper limit correction coefficient according to different industrial steam extraction positions, and finally output the theoretical output upper limit under the current heating steam extraction and industrial steam extraction; the calculation of the corresponding industrial steam extraction upper limit correction coefficient according to different industrial steam extraction positions is characterized by: The output upper limit correction coefficient y1 of the extraction position before the reheating cold section: y1=(h-low pressure cylinder exhaust enthalpy+reheat hot section enthalpy-reheat cold section enthalpy) / 3600 The output upper limit correction coefficient y2 of the extraction position in the reheat cold section: y2=(reheating hot section enthalpy-low pressure cylinder exhaust enthalpy) / 3600 Output upper limit correction coefficient y3 when the extraction position is in the reheating hot section or after the reheating hot section: y3=(h-low pressure cylinder exhaust enthalpy) / 3600 Where: h is the extraction enthalpy corresponding to the actual extraction position of the unit. The enthalpy values ​​at different positions can be obtained by querying the steam-water enthalpy-entropy diagram based on the pressure and temperature corresponding to the position; Compare it with the actual reported output upper limit of the unit. If it is less than the theoretical output upper limit, check the peak output capacity of the unit and find out if it is restricted by the heat load. If there is no other reason, dispatch it according to the theoretical output upper limit.

6. The optimization system for meeting the power supply demand during the heating season based on electric and thermal coordination according to claim 5, characterized in that: The heating operating condition diagram is a coupling relationship diagram of the main steam flow, heating steam extraction volume and active power; There is a theoretical output upper limit corresponding to each heating steam extraction volume. Based on different heating steam extraction volumes and corresponding theoretical output upper limits, a thermoelectric relationship curve is generated and a mathematical relationship between the unit output upper limit and the heating steam extraction volume is fitted.

7. The optimization system for meeting the power supply demand during the heating season based on electric-heat coordination according to claim 5, characterized in that: The calculation formula for the upper limit of the theoretical output of the unit considering heating and industrial heat loads is as follows: Ptotal=P-y1*t1-y2*t2-y3*t3 Where: Ptotal is the theoretical output upper limit of the unit considering heating and industrial heat loads, P is the theoretical output upper limit considering heating heat load, t1, t2, and t3 are the industrial steam extraction capacities corresponding to different steam extraction positions, and the actual industrial steam extraction capacities of the unit can be obtained by querying DCS data.

8. The optimization system for meeting the power supply demand during the heating season based on electric-heat coordination according to claim 5, characterized in that: Also includes: If the actual output limit of the unit cannot maintain the theoretical output limit due to the actual situation of the unit, the measures that can be adopted include: Without changing the heating network parameters, directly reduce the heating steam extraction of the unit. Based on the delay and attenuation characteristics of the heating network and with the minimum room temperature standard of residents as the constraint condition, "reducing heating and increasing electricity" can be achieved in a short period of time to improve the peak output capacity of the unit without affecting the heating comfort of users; or Adjust the heating temperature of the primary heating network. Before the peak hours of electricity and heating, increase the heating steam extraction volume in advance to improve the heat storage capacity of the heating network system. During the peak hours of electricity consumption, temporarily reduce the heating steam extraction volume to increase the peak output capacity of the unit without affecting the heating comfort of users; or Adjust the circulating water volume of the primary heating network. Before the peak electricity and heating hours, increase the circulating water volume of the heating network in advance to improve the heat storage capacity of the heating network system. During the peak electricity consumption hours, reduce the heating steam extraction volume for a short time to improve the peak output capacity of the unit without affecting the heating comfort of the users.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method according to any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 4 are executed.

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