A method and system for economic operation of an electric boiler auxiliary heating unit

Abstract

The present application relates to the technical field of coal-fired heating unit operation optimization, and discloses a method and system for economic operation of an electric boiler auxiliary heating unit, which first acquires heating unit operation data, and determines the boundaries of the electric-thermal safe operation domain by fitting; then constructs a cost and benefit calculation function for the coupling of the heating unit and the electric boiler based on the boundaries, and establishes an electric-thermal coupling net benefit calculation model in combination with the boundary conditions; subsequently, the net benefit difference between the state of electric boiler operation and non-operation is calculated to determine the operation criterion; then, according to the criterion, the net benefit under different spot market electricity prices and electric boiler operation power is calculated to determine the operation critical electricity price; finally, an optimization algorithm is used to solve the optimal operation power of the electric boiler and form the operation strategy, with the maximum overall net benefit after operation as the target. The present application can realize the economic, efficient and stable collaborative operation of the electric boiler and the heating unit, and provide technical support for heating unit operation optimization.

Description

Technical Field

[0001] This invention relates to the field of coal-fired heating unit operation optimization technology, specifically to a commissioning method and system for the economical operation of an electric boiler auxiliary heating unit. Background Technology

[0002] With the deepening of power market reform, the participation of coal-fired power generating units in spot market competition has become an inevitable trend. In the spot market environment, electricity prices fluctuate significantly. While meeting heating demand, heating units also need to flexibly adjust their power generation output to respond to changes in market electricity prices, thereby improving economic returns.

[0003] However, traditional coal-fired heating units are constrained by the "heat-driven power generation" operation mode, with strong coupling between electricity and heat output, limited peak-shaving capacity, and difficulty in adapting to the high flexibility requirements of the spot market.

[0004] Currently, some power plants use electric boilers for auxiliary heating, improving unit operational flexibility through electrothermal decoupling. However, in the current spot market environment, a systematic solution has not yet been developed for the timing of electric boiler commissioning, power allocation, and optimization strategies for coordination with the main unit.

[0005] Existing technologies often only consider single operating conditions or fixed electricity price models, lacking dynamic optimization methods for fluctuations in spot market electricity prices, resulting in the failure to fully realize the economic benefits of electric boilers. In addition, the coordinated control strategies between electric boilers and generating units are insufficient, and simply putting electric boilers into operation or taking them out of operation may affect heating stability or increase operating costs.

[0006] In summary, there is an urgent need for an economical operation and commissioning strategy for electric boiler auxiliary heating units that adapts to the needs of the spot market. This strategy should dynamically optimize the timing of commissioning and power allocation of electric boilers to maximize the economic benefits of heating units in the spot market while ensuring heating reliability. Summary of the Invention

[0007] In order to overcome the defects of the existing technology, the purpose of this invention is to provide a commissioning method and system for the economical operation of an electric boiler auxiliary heating unit, so as to solve the technical problems of insufficient flexibility of heating units and underutilization of the economic benefits of electric boilers in the spot market environment.

[0008] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a method for the economical commissioning of an auxiliary heating unit for electric boilers, comprising: Acquire operating data of the heating unit and fit to determine the boundaries of the electric heating safe operating domain of the heating unit; Based on the boundaries of the electric heating safety operation domain of the heating unit, construct the cost and benefit calculation functions of the heating unit coupled with the electric boiler; Based on the boundaries of the electric heating safe operation domain of the heating unit and the cost and benefit calculation functions of the heating unit coupled with the electric boiler, a net benefit calculation model for the electric-thermal coupling of the heating unit and the electric boiler is established. Based on the aforementioned electric-thermal coupling net benefit calculation model, the difference in net benefit between the electric boiler in operation and in operation is calculated to determine the criteria for putting the electric boiler into operation. Based on the criteria for commissioning electric boilers, the net revenue under different spot market electricity prices and different commissioning power of electric boilers is calculated to determine the critical electricity price for commissioning electric boilers. An optimization algorithm is used to calculate the optimal operating power of the electric boiler with the goal of maximizing the overall net benefit after the electric boiler is put into operation, thus forming an electric boiler operation strategy.

[0009] Preferably, the boundaries of the electric heating safe operation domain include the boiler maximum evaporation capacity boundary, the boiler minimum evaporation capacity boundary, and the low-pressure cylinder minimum flow rate boundary, wherein the expressions for each boundary are as follows: Boiler maximum evaporation capacity boundary:

[0010] In the formula, The electrical load (MW) of the heating unit at the boundary of the boiler's maximum evaporation capacity under a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions; Heat load, MW; Boiler minimum evaporation capacity boundary:

[0011] In the formula, The electrical load (MW) of the heating unit at the boiler's minimum evaporation capacity boundary at a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions; Minimum flow rate boundary for low-pressure cylinder:

[0012] In the formula, The electrical load (MW) of the heating unit at the minimum flow rate boundary of the low-pressure cylinder under a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions.

[0013] Preferably, the cost and revenue calculation functions for the heat turbine coupled with the electric boiler include a power sales revenue calculation function, a heating revenue calculation function, an electric boiler-heat relationship calculation function, and a coal cost calculation function.

[0014] Furthermore, the function for calculating electricity sales revenue is as follows:

[0015] In the formula, Revenue from selling electricity to the grid is expressed in yuan / hour. This refers to the on-grid electricity price in the spot market, expressed as RMB / MWh. For the electrical load of the heating unit, MW; The function for calculating heating revenue is as follows:

[0016] In the formula, Heating revenue per hour is calculated based on the heat load. Heat load, MW; The heating price is in yuan / GJ. The calculation function for the electrothermal relationship of the electric boiler is as follows:

[0017] In the formula, The electric heating efficiency of the electric boiler is expressed in yuan / h. The heat load of the electric boiler is in MW. The power load of the electric boiler is measured in MW. The coal cost calculation function includes a coal consumption calculation formula and a coal cost calculation formula. The coal consumption calculation formula is as follows:

[0018] In the formula, The coal consumption of the heating unit under both electrical and thermal loads, in tons per hour (t / h). These are the correlation coefficients; The formula for calculating the cost of coal is as follows:

[0019] In the formula, Cost of coal, in yuan / hour; Price is the unit price of coal, in yuan / ton.

[0020] Preferably, the net benefit calculation model for the electric-thermal coupling of the heating unit and the electric boiler includes the net benefit calculation formula when the electric boiler is not in operation and the net benefit calculation formula after the electric boiler is in operation. The formula for calculating the net profit of an electric boiler when it is not in operation is as follows:

[0021] In the formula, The net revenue of the heating unit when the electric boiler is not in operation is expressed in yuan / h. The revenue from electricity sales by the heating unit is yuan / h; The heating revenue of the heating unit is expressed in yuan / hour. The cost of coal for the heating unit is yuan / hour; The formula for calculating the net profit after the electric boiler is put into operation is as follows:

[0022] In the formula, The net revenue of the heating unit after the electric boiler is put into operation is expressed in yuan / h. The minimum power generation load (MW) of the heating unit + electric boiler as a whole after the electric boiler is put into operation; The amount of coal consumed by the heating unit at the lowest power generation load of the heating unit and the electric boiler as a whole after the electric boiler is put into operation, in t / h, under the premise of ensuring heating supply. Among them, the heat load is At that time, the minimum electrical load of the heating unit is:

[0023] In the formula, The minimum electrical load for the heating unit's heat load, in MW; Given the operating load of the electric boiler Overall minimum power generation load The formula for calculation is: .

[0024] Preferably, the difference in net revenue between the electric boiler being in operation and not in operation is:

[0025] In the formula, The difference in net revenue between heating units with and without electric boilers in operation, expressed in yuan / h; The criterion for putting the electric boiler into operation is as follows: .

[0026] Preferably, the critical electricity price calculation formula for the commissioning of electric boilers is as follows:

[0027] When the spot electricity price is lower than the critical price, the electric boiler will be put into operation; otherwise, the electric boiler will not be put into operation.

[0028] Preferably, an optimization algorithm is used to calculate the optimal operating power of the electric boiler, with the objective of maximizing the overall net profit after the electric boiler is put into operation. The optimization model uses the operating power of the electric boiler as the optimization variable and the objective function is to maximize the overall net profit of the heating unit and the electric boiler after the electric boiler is put into operation. The constraints are as follows:

[0029] in, The optimal operating power for the electric boiler; This is the operating load for the electric boiler.

[0030] Preferably, the electric boiler commissioning strategy also includes: taking a series of different heating loads Calculate the critical electricity price data points for different operating power of electric boilers; when the on-grid electricity price in the spot market is lower than the minimum critical electricity price under any heating load, the electric boiler is put into full-load operation under the condition that the overall electricity load of the heating unit and the electric boiler is not lower than 0.

[0031] Secondly, the present invention also provides an operation system for the economical operation of an auxiliary heating unit for an electric boiler, comprising: The data processing module acquires the operating data of the heating unit and fits and determines the boundaries of the electric heating safety operation domain of the heating unit. The function construction module is used to construct cost and benefit calculation functions for the coupled electric boiler of the heating unit based on the various boundaries of the electric heating safety operation domain of the heating unit; The model building module is used to combine the various boundaries of the electric heating safety operation domain of the heating unit and the cost and benefit calculation functions of the heating unit coupled with the electric boiler to establish a net benefit calculation model for the electric-thermal coupling of the heating unit and the electric boiler. The criterion determination module is used to calculate the difference in net income between the electric boiler in operation and in operation based on the electric-thermal coupling net income calculation model, and to determine the criterion for putting the electric boiler into operation. The critical calculation module is used to calculate the net revenue under different spot market electricity prices and different operating power of electric boilers based on the electric boiler commissioning criteria, and to determine the critical electricity price for electric boiler commissioning. The strategy generation module is used to calculate the optimal operating power of the electric boiler and form an electric boiler operation strategy by using optimization algorithms with the goal of maximizing the overall net benefit after the electric boiler is put into operation.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a method for the economical commissioning of an electric boiler-assisted heating unit. By acquiring the unit's operating data and fitting it to determine the boundaries of the electric-thermal safe operating domain, it clarifies the range of electrical load operation of the unit under different heat loads. This breaks the limitation of strong coupling between electrical and thermal output in the traditional heat-determined power generation model, providing a scientific basis for flexibly adjusting the unit's power generation output. Based on this electric-thermal safe operating domain, cost and benefit calculation functions are constructed, and an electric-thermal coupled net benefit calculation model is established by combining the two. This achieves accurate quantification of the unit's net benefit before and after the electric boiler commissioning, avoiding the shortcomings of existing technologies that only consider a single operating condition or fixed electricity price and lack dynamic optimization. The commissioning criteria for the electric boiler are determined by calculating the net benefit difference. By combining different spot market electricity prices and the operating power of electric boilers to calculate net revenue and determine the critical electricity price, and then using an optimization algorithm to calculate the optimal operating power of electric boilers and form an operation strategy, the goal of maximizing the overall net revenue of the entire heating power plant can be achieved. This enables the coordinated and economical operation of electric boilers and heating units, ensuring heating reliability and dynamically adjusting the operating status and power of electric boilers according to fluctuations in spot market electricity prices. This fully leverages the electrothermal decoupling effect of electric boilers, enhances the competitiveness of heating units in the spot market, and effectively solves the problems of insufficient economy and affected heating stability caused by unreasonable timing of electric boiler operation and power allocation in existing technologies. Ultimately, this achieves economical, efficient, and stable operation of electric boilers and heating units. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating the commissioning method for the economical operation of an electric boiler auxiliary heating unit in an embodiment of the present invention. Figure 2 This is a schematic diagram of the electric heating safety operation domain of a heating unit under the conditions of electric boiler being in operation / not in operation in an embodiment of the present invention; Figure 3 This is a schematic diagram of the unit's net revenue and critical electricity price under different spot electricity prices when the heating load is 400MW and the electric boiler's operating power is 150MW, as shown in this embodiment of the invention. Figure 4 This is a schematic diagram illustrating the net revenue under different operating power of electric boilers when the critical electricity price is 138.51 yuan / MWh in an embodiment of the present invention. Figure 5 This is a schematic diagram of the critical electricity price curve in the electricity spot market under different heating loads and different operating power of electric boilers in this embodiment of the invention; Figure 6 This is a schematic diagram of the commissioning system for the economical operation of the electric boiler auxiliary heating unit in an embodiment of the present invention; In the diagram: 1. Data processing module; 2. Function construction module; 3. Model building module; 4. Criterion determination module; 5. Critical calculation module; 6. Strategy generation module. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] The purpose of this invention is to provide a method and system for the economical operation of an electric boiler auxiliary heating unit, in order to solve the technical problems of insufficient flexibility of heating units and underutilization of the economic benefits of electric boilers in the spot market environment.

[0037] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 This invention provides a method for the economical commissioning of an auxiliary heating unit for electric boilers, comprising: Step 1: Obtain the operating data of the heating unit and fit and determine the boundaries of the electric heating safe operating domain of the heating unit. Specifically, the boundaries of the electrothermal safe operation domain include the boiler maximum evaporation capacity boundary, the boiler minimum evaporation capacity boundary, and the low-pressure cylinder minimum flow rate boundary, wherein the expressions for each boundary are as follows: Boiler maximum evaporation capacity boundary:

[0038] In the formula, The electrical load (MW) of the heating unit at the boundary of the boiler's maximum evaporation capacity under a given heat load; Calculate the coefficients of each term in the correlation equation for the above boundaries; Heat load, MW; Boiler minimum evaporation capacity boundary:

[0039] In the formula, The electrical load (MW) of the heating unit at the boiler's minimum evaporation capacity boundary at a given heat load; Calculate the coefficients of each term in the correlation equation for the above boundaries; Minimum flow rate boundary for low-pressure cylinder:

[0040] In the formula, The electrical load (MW) of the heating unit at the minimum flow rate boundary of the low-pressure cylinder under a given heat load; Calculate the coefficients of each term in the correlation equation for the above boundaries.

[0041] Step 2: Construct cost and benefit calculation functions for the coupled electric boiler of the heating unit based on the boundaries of each boundary of the electric heating safety operation domain of the heating unit; Specifically, the cost and revenue calculation functions for heating units coupled with electric boilers include functions for calculating electricity sales revenue, heating revenue, the relationship between electricity and heat from the electric boiler, and coal cost.

[0042] The following function is constructed to calculate the electricity sales revenue of a single generating unit, based on the on-grid electricity price at a certain moment in the spot market:

[0043] In the formula, Revenue from selling electricity to the grid is expressed in yuan / hour. This refers to the on-grid electricity price in the spot market, expressed as RMB / MWh. For the electrical load of the heating unit, MW; The function for calculating heating revenue is as follows:

[0044] In the formula, Heating revenue per hour is calculated based on the heat load. Heat load, MW; The heating price is in yuan / GJ. Based on the capacity and electric heating efficiency of the electric boiler in the thermal power plant, the following function is constructed to calculate the electrothermal relationship of the electric boiler:

[0045] In the formula, The electric heating efficiency of the electric boiler is expressed in yuan / h. The heat load of the electric boiler is in MW. The power load of the electric boiler is measured in MW. The coal cost calculation function includes a coal consumption calculation formula and a coal cost calculation formula. The coal consumption calculation formula is as follows:

[0046] In the formula, The coal consumption of the heating unit under electrical and thermal loads, in tons per hour (t / h). These are the correlation coefficients; Based on coal prices, the coal consumption cost of a single unit under a given power and heat load is calculated as follows:

[0047] In the formula, Cost of coal, in yuan / hour; Price is the unit price of coal, in yuan / ton.

[0048] Step 3: Combine the boundaries of the electric heating safe operation domain of the heating unit and the cost and benefit calculation functions of the coupled electric boiler of the heating unit to establish the electric-thermal coupling net benefit calculation model of the heating unit and the electric boiler. Specifically, the heating unit is operating at a heat load of Under these circumstances, the generating load of the unit There are upper and lower limits; the electrical load is not greater than The lower limit of electrical load shall not be lower than and When the on-grid electricity price in the spot electricity market is high, heating units generate electricity at their maximum capacity while ensuring heating supply, thus maximizing profits, and electric boilers are not put into operation. Conversely, when the on-grid electricity price in the spot electricity market is low, the less electricity generated by the units, the greater the net profit, while ensuring heating supply. By operating electric boilers, some of the low-priced electricity is converted into heat for sale, while simultaneously reducing the generating load of the units, thereby maximizing net profits.

[0049] When the electricity price in the spot market is At that time, under the premise of ensuring heating supply, the heat load is The net revenue of the heating unit when the electric boiler is not in operation is calculated as follows:

[0050] In the formula, The net revenue of the heating unit when the electric boiler is not in operation is expressed in yuan / h. The revenue from electricity sales by the heating unit is yuan / h; The heating revenue of the heating unit is expressed in yuan / hour. The cost of coal for the heating unit is yuan / hour; After the electric boiler is put into operation, the heat load will still be guaranteed to be [value missing]. At this time, the net power generation load of the heating unit after deducting the power consumption load of the electric boiler is... Reduced to ( ), coal consumption from Reduced to In this case, the net revenue of the heating unit is calculated as follows:

[0051] In the formula, The net revenue of the heating unit after the electric boiler is put into operation is expressed in yuan / h. The minimum power generation load (MW) of the heating unit + electric boiler as a whole after the electric boiler is put into operation; The amount of coal consumed by the heating unit at the lowest power generation load of the heating unit and the electric boiler as a whole after the electric boiler is put into operation, in t / h, under the premise of ensuring heating supply. Among them, the heat load is At that time, the minimum electrical load of the heating unit is:

[0052] In the formula, The minimum electrical load for the heating unit's heat load, in MW; Given the operating load of the electric boiler Substitute into the following formula to calculate the minimum power generation load of the heating unit + electric boiler after the electric boiler is put into operation. : .

[0053] Step 4: Based on the electric-thermal coupling net benefit calculation model, calculate the difference in net benefit between the electric boiler in operation and in operation, and determine the criteria for putting the electric boiler into operation. Specifically, calculate the difference in net revenue between the unit before and after the electric boiler is put into operation. :

[0054] In the formula, The difference in net revenue between heating units with and without electric boilers in operation, expressed in yuan / h; The conditions for putting an electric boiler into operation are determined based on the net revenue before and after its commissioning: if the net revenue increases after the boiler is put into operation, the strategy of putting the boiler into operation is adopted; otherwise, the boiler is not put into operation. Based on this, the following criteria for putting an electric boiler into operation are obtained: .

[0055] Step 5: Calculate the net revenue under different spot market electricity prices and different operating power of electric boilers based on the electric boiler commissioning criteria, and determine the critical electricity price for electric boiler commissioning; Specifically, calculations were performed using on-grid electricity prices from a series of different spot electricity markets to obtain two sets of curves: net profit minus the spot electricity price for electric boilers not in operation and those with electric boilers in operation. and The intersection of the curves is calculated to obtain the critical electricity price for the commissioning of the electric boiler of the heating unit. When the market spot electricity price is lower than the critical price, the electric boiler will be put into operation; otherwise, it will not be put into operation. The corresponding critical price is calculated as follows:

[0056] Under critical electricity price conditions, single electric boilers are put into operation until... At the same time, the net profit of the heating unit with and without the electric boiler in operation is equal; and when the electric boiler's operating power is 0, that is, when the electric boiler is not in operation, its effect is also equal to the net profit of not operating it; between 0 and There exists an optimal operating power for electric boilers within this range. , can make Reaching the maximum ; Step 6: Using an optimization algorithm, with the goal of maximizing the overall net benefit after the electric boiler is put into operation, calculate the optimal operating power of the electric boiler and form an electric boiler operation strategy.

[0057] Specifically, an optimization model is constructed with the operating power of the electric boiler as the optimization variable and the overall net profit of the heating unit combined with the electric boiler after its commissioning as the objective function. The model includes the objective function and constraints, where the objective function is as follows:

[0058] The constraints are as follows:

[0059] Using an optimization algorithm, for 0 to By optimizing the operating power of the electric boilers in the given range, the optimal operating power of the electric boilers can be obtained. ; Among them, a series of different heating loads are taken. The system calculates critical electricity price data points for a series of different electric boiler operating power. When the on-grid electricity price in the spot electricity market is lower than the minimum critical electricity price under any heating load, the electric boiler operation strategy is to operate at full load while ensuring that the overall electricity load of "heating unit + electric boiler" is not lower than 0.

[0060] Example 1 Taking a 670MW-class heating unit as an example, the unit's operating domain data is obtained as follows: Figure 2 As shown; to visually demonstrate the operation status of the electric boiler after commissioning, the newly added electric heating safety operation domain of "heating unit + electric boiler" after commissioning is also drawn, such as... Figure 2 The newly added operating domain section below shows that the overall electrical load of the heating unit combined with the electric boiler remains above zero. In the electricity spot market, whether an electric boiler is put into operation is mainly affected by the spot electricity price. Based on the spot electricity price, the following strategy is set for the operation of the electric boiler: When the on-grid electricity price of generating units in the spot electricity market is high, under the premise of ensuring heating supply, the heating units generate electricity at the upper limit of the power generation load, and the electric boilers are not put into operation. When the on-grid electricity price for generating units is low in the electricity spot market, under the premise of ensuring heating supply, the less electricity generated by the generating units, the greater the net profit.

[0061] By putting electric boilers into operation, some of the low-priced electricity can be converted into heat and sold to the outside world, while reducing the power generation load of the unit, thereby maximizing net income.

[0062] Taking a heating load of 400MW as an example, and considering different grid-connected electricity prices in the spot market, increasing from 0.1 yuan / kWh (i.e., 1 yuan / MWh) to 1.3 yuan / kWh (i.e., 1300 yuan / MWh), the net revenue of the heating unit is calculated using the method of this invention under two scenarios: 1) no electric boiler in operation; and 2) 150MW of electric boiler in operation. The results are attached. Figure 3 As shown in the results, when the two lines intersect at a single point, the electricity price at this point is the critical price, i.e., the critical price for the operation / non-operation of the electric boiler is 138.51 yuan / MWh. This result indicates that when the spot market electricity price is higher than 138.51 yuan / MWh, operating the heating unit without the electric boiler is the optimal strategy, with the electric boiler operating power at 0MW; when the spot market electricity price is lower than 138.51 yuan / MWh, operating the heating unit with the electric boiler is the optimal strategy, ensuring that the electric boiler operating power does not exceed 150MW. The aforementioned results indicate that when the spot electricity price is 138.51 yuan / MWh, the net profit of the heating unit is equal and in a loss-making state when the electric boiler's operating power is 0 (i.e., the electric boiler is not in operation) and when the electric boiler's operating power is 150MW. Therefore, there exists an optimal electric boiler operating power. By optimizing within the range of 0 to 150MW, the net profit can be maximized, i.e., the loss of the heating unit is minimized under low electricity prices. Here, the electric boiler operating power is used as the optimization variable, and the net profit after the electric boiler is put into operation in the above calculation model is used as the optimization objective. A genetic algorithm is used for optimization, and the optimal electric boiler operating power of 74.9MW is obtained. To clearly illustrate the optimization results, the net profit curves for different electric boiler operating powers are calculated and attached. Figure 4 As shown in the figure, when the operating power of the electric boiler is 74.9MW, the net profit of the unit can be maximized under the conditions of a spot electricity market price of 138.51 yuan / MWh and a guaranteed heating capacity of 400MW.

[0063] Similarly, the critical electricity price curves under different typical heat loads and typical electric boiler operating power were calculated, and the results are attached. Figure 5As shown, the critical electricity price is generally distributed between 133 and 142 yuan / MWh under different heat loads and different electric boiler operating capacities. Therefore, for the case study heating unit, in the electricity spot market, when the electricity price is higher than 142 yuan / MWh, the electric boilers are not operated. When the electricity price is between 133 and 142 yuan / MWh, for a specific heating load, there exists a critical electricity price corresponding to the electric boiler operating capacity, and the optimal operating capacity of the electric boilers is between 0 and the operating capacity corresponding to the critical electricity price. As the electricity price further drops below 133 yuan / MWh, regardless of the heating load, the electric boilers should be operated, and the optimal operating capacity is to operate at full load as much as possible while ensuring that the overall electricity load of the heating unit combined with the electric boilers is greater than 0. In an extreme case, if the electricity spot market price is 0 yuan, all electric boilers should be put into operation for heating, and the heating unit should minimize its power generation load while meeting the remaining heating demand.

[0064] Example 2 according to Figure 6 As shown, this embodiment also provides an operation system for the economical operation of an electric boiler auxiliary heating unit, including: Data processing module 1 acquires the operating data of the heating unit and fits and determines the boundaries of the electric heating safety operation domain of the heating unit. Function construction module 2 is used to construct cost and benefit calculation functions for the coupled electric boiler of the heating unit based on each boundary of the electric heating safety operation domain of the heating unit; Model building module 3 is used to combine the various boundaries of the electric heating safe operation domain of the heating unit and the cost and benefit calculation functions of the heating unit coupled with the electric boiler to establish a net benefit calculation model for the electric-thermal coupling of the heating unit and the electric boiler. Criterion determination module 4 is used to calculate the difference in net income between the electric boiler in non-operation and operation states based on the electric-thermal coupling net income calculation model, and to determine the criterion for putting the electric boiler into operation. Critical calculation module 5 is used to calculate the net revenue under different spot market electricity prices and different operating power of electric boilers based on the electric boiler commissioning criteria, and to determine the critical electricity price for electric boiler commissioning; Strategy generation module 6 is used to calculate the optimal operating power of the electric boiler and form an electric boiler operation strategy by using an optimization algorithm with the goal of maximizing the overall net benefit after the electric boiler is put into operation.

[0065] In summary, the commissioning method and system for economical operation of electric boiler-assisted heating units provided in this embodiment aims to maximize the unit's net revenue. By constructing an electricity-heat coupling calculation model that considers spot electricity price fluctuations, and using the net revenue of the heating unit before and after commissioning the electric boiler as a criterion, the optimal commissioning strategy for the electric boiler under different electricity price periods is obtained. Using this method, the heating unit can dynamically respond to spot market price signals during operation, automatically assess the impact of the electric boiler's commissioning / shutdown mode on the unit's revenue, and the optimization results can directly provide the optimal commissioning strategy and operating power for the electric boiler, thereby solving the problem of insufficient flexibility in electricity and heat regulation of traditional heating units in the spot market. This method can solve the commissioning problem of economical operation of electric boiler-assisted heating units under different heating loads and different market electricity prices in the electricity spot market. It ensures maximum net revenue of the heating unit during high electricity prices and effectively reduces losses when the unit faces losses during low electricity prices, significantly improving the competitiveness of the heating unit in the electricity spot market. The method of this invention can help thermal power enterprises achieve high-quality development and has broad application prospects.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for the economical commissioning of an auxiliary heating unit for an electric boiler, characterized in that, include: Step 1: Obtain the operating data of the heating unit and fit and determine the boundaries of the electric heating safe operating domain of the heating unit; wherein, the boundaries of the electric heating safe operating domain of the heating unit include the maximum evaporation capacity boundary of the boiler, the minimum evaporation capacity boundary of the boiler, and the minimum flow rate boundary of the low-pressure cylinder. Step 2: Construct cost and benefit calculation functions for the coupled electric boiler of the heating unit based on the boundaries of each boundary of the electric heating safety operation domain of the heating unit; The cost and revenue calculation functions of the heating unit coupled with the electric boiler include the heating unit electricity sales revenue calculation function, the heating unit heating revenue calculation function, the electric boiler electric-thermal relationship calculation function, and the heating unit coal cost calculation function. Step 3: Combine the boundaries of the electric heating safe operation domain of the heating unit and the cost and benefit calculation functions of the coupled electric boiler of the heating unit to establish the electric-thermal coupling net benefit calculation model of the heating unit and the electric boiler. The electric-thermal coupling net benefit calculation model for the heating unit and the electric boiler includes the net benefit calculation formula for the heating unit when the electric boiler is not in operation and the net benefit calculation formula for the heating unit after the electric boiler is in operation. The formula for calculating the net revenue of a heating unit when the electric boiler is not in operation is as follows: In the formula, The net revenue of the heating unit when the electric boiler is not in operation; Revenue from selling electricity to the grid from the electrical load of the heating unit; The heating revenue from the heat load of the heating unit; The cost of coal for heating units; The on-grid electricity price in the spot market; For the electrical load of the heating unit; For heating prices; For the heat load of the heating unit; For heating units with electrical load of and heat load is Coal consumption at that time; This refers to the unit price of coal. The formula for calculating the net revenue of the heating unit after the electric boiler is put into operation is as follows: In the formula, The net revenue of the heating unit after the electric boiler is put into operation; This represents the minimum power generation load of the heating unit + electric boiler as a whole after the electric boiler is put into operation; This refers to the coal consumption of the heating unit when the overall power generation load of the heating unit and the electric boiler is at its minimum power generation load after the electric boiler is put into operation, under the premise of ensuring heating supply. Among them, the heat load is At that time, the minimum electrical load of the heating unit is: In the formula, This is the minimum electrical load of the heating unit at a given heat load. The electrical load of the heating unit at the boiler's minimum evaporation capacity boundary at a given heat load; The electrical load on the minimum flow rate boundary of the low-pressure cylinder of the heating unit at a given heat load; Given the operating load of the electric boiler At that time, the minimum power generation load of the entire heating unit + electric boiler The formula for calculation is: ； In the formula, For the heat load of the electric boiler, To put the electric load into operation for the electric boiler; Step 4: Based on the electric-thermal coupling net benefit calculation model, calculate the difference in net benefit of the heating unit when the electric boiler is not in operation and after it is in operation, and determine the criteria for putting the electric boiler into operation. The difference in net revenue between the electric boiler when it is not in operation and when it is in operation is: ； In the formula, This represents the difference in net revenue of the heating unit when the electric boiler is not in operation and after it is put into operation. The net revenue of the heating unit when the electric boiler is not in operation is expressed in yuan / h. The net revenue of the heating unit after the electric boiler is put into operation is expressed in yuan / h. The criterion for putting the electric boiler into operation is as follows: ； Step 5: Calculate the on-grid electricity price in different spot markets and the net revenue under different operating power of electric boilers based on the electric boiler commissioning criteria, and determine the critical electricity price for electric boiler commissioning; Specifically, by taking a series of different spot electricity market on-grid prices, a curve was obtained showing the net revenue of the heating unit when the electric boiler is not in operation minus the spot electricity market on-grid price. The curve showing the net revenue of the heating unit after the electric boiler is put into operation - the on-grid electricity price in the spot electricity market. The critical electricity price for putting an electric boiler into operation is obtained by calculating the intersection of the two curves; when the on-grid electricity price in the spot market is lower than the critical electricity price, the electric boiler is put into operation; otherwise, the electric boiler is not put into operation. Step 6: Using an optimization algorithm, with the goal of maximizing the overall net benefit after the electric boiler is put into operation, calculate the optimal operating power of the electric boiler and form an electric boiler operation strategy.

2. The commissioning method for economical operation of an auxiliary heating unit for an electric boiler according to claim 1, characterized in that, The expression for the maximum evaporation capacity boundary of the boiler is: In the formula, The electrical load of the heating unit at the boundary of the boiler's maximum evaporation capacity under a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions; For the heat load of the heating unit; The expression for the minimum evaporation capacity boundary of the boiler is: In the formula, The electrical load of the heating unit at the boiler's minimum evaporation capacity boundary at a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions; The expression for the minimum flow rate boundary of the low-pressure cylinder is: In the formula, The electrical load on the minimum flow rate boundary of the low-pressure cylinder of the heating unit at a given heat load; Calculate the coefficients of each term in the correlation equation for the boundary conditions.

3. The commissioning method for economical operation of an auxiliary heating unit for an electric boiler according to claim 1, characterized in that, The function for calculating the electricity sales revenue of the heating unit is as follows: In the formula, Revenue from selling electricity to the grid from the electrical load of the heating unit; The on-grid electricity price in the spot market; For the electrical load of the heating unit; The function for calculating the heating revenue of the heating unit is as follows: In the formula, The heating revenue from the heat load of the heating unit; For the heat load of the heating unit; For heating prices; The calculation function for the electrothermal relationship of the electric boiler is as follows: In the formula, The electric heating efficiency of the electric boiler; For the heat load of the electric boiler; To put the electric load into operation for the electric boiler; The function for calculating the coal cost of the heating unit includes a formula for calculating the coal consumption of the heating unit and a formula for calculating the coal cost of the heating unit. The formula for calculating the coal consumption of the heating unit is as follows: In the formula, For heating units with electrical load of and heat load is Coal consumption at that time; These are the correlation coefficients; The formula for calculating the coal cost of the heating unit is as follows: In the formula, For the cost of coal used in heating units; This refers to the unit price of coal.

4. The commissioning method for economical operation of an auxiliary heating unit for an electric boiler according to claim 1, characterized in that, The critical electricity price for putting the electric boiler into operation is calculated as follows: 。 5. The commissioning method for economical operation of an auxiliary heating unit for an electric boiler according to claim 1, characterized in that, The aforementioned optimization algorithm, aiming to maximize the overall net benefit after the electric boiler is put into operation, calculates the optimal operating power of the electric boiler. This includes constructing an optimization model with the electric boiler's operating power as the optimization variable and maximizing the overall net benefit of the heating unit combined with the electric boiler after its operation as the objective function. The constraints of the optimization model are as follows: in, The optimal operating power for the electric boiler; To put the electric load into operation for the electric boiler; Using an optimization algorithm, for 0 to The operating power of the electric boilers was optimized to obtain the optimal operating power of the electric boilers. .

6. The commissioning method for economical operation of an auxiliary heating unit for an electric boiler according to claim 1, characterized in that, The electric boiler commissioning strategy includes: taking a series of different heating unit heat loads. Calculate the critical electricity price data points under different operating power of electric boilers; when the on-grid electricity price in the spot market is lower than the lowest critical electricity price under the heat load of all heating units, the electric boiler is put into full-load operation under the condition that the overall electricity load of the heating units and the electric boiler is not lower than 0.

7. An operation system for the economical operation of an auxiliary heating unit for an electric boiler, characterized in that, The system is used to implement the commissioning method for the economical operation of an electric boiler auxiliary heating unit as described in any one of claims 1-6, comprising: The data processing module acquires the operating data of the heating unit and fits and determines the boundaries of the electric heating safety operation domain of the heating unit. The function construction module is used to construct cost and benefit calculation functions for the coupled electric boiler of the heating unit based on the various boundaries of the electric heating safety operation domain of the heating unit; The model building module is used to combine the various boundaries of the electric heating safety operation domain of the heating unit and the cost and benefit calculation functions of the heating unit coupled with the electric boiler to establish a net benefit calculation model for the electric-thermal coupling of the heating unit and the electric boiler. The criterion determination module is used to calculate the difference in net revenue of the heating unit when the electric boiler is not in operation and after it is in operation, based on the electric-thermal coupling net revenue calculation model, and to determine the criterion for putting the electric boiler into operation. The critical calculation module is used to calculate the on-grid electricity price in different spot markets and the net revenue under different operating power of electric boilers based on the electric boiler commissioning criteria, and to determine the critical electricity price for electric boiler commissioning. The strategy generation module is used to calculate the optimal operating power of the electric boiler and form an electric boiler operation strategy by using optimization algorithms with the goal of maximizing the overall net benefit after the electric boiler is put into operation.

Images