Quantity reporting method and device for participation of electrolytic aluminum load in power grid demand response

Abstract

The invention provides an electrolytic aluminum load participation power grid demand response quantity reporting method and device, and relates to the technical field of power system operation and control. The method comprises the following steps: determining demand response subsidy and product profit loss of electrolytic aluminum load participating in power grid demand response; calculating the total control cost for adjusting the electrolytic aluminum load according to the influence of the electrolytic aluminum load participating in the power grid demand response on production; obtaining the income of the electrolytic aluminum load participating in the power grid demand response based on the demand response subsidy, the product profit loss and the total control cost, and determining an objective function and a constraint condition of the income; and solving the maximum value of the target function of the income, and outputting power configuration reaching the maximum income. According to the method, the demand response subsidy and the product profit loss are comprehensively considered, the power of the electrolytic aluminum load is optimally configured, and the report participating in the power grid demand response can reach the maximum benefit under the ideal condition.

Description

Technical Field

[0001] The present invention relates to the technical field of power system operation and control, and particularly to a method and device for reporting the amount of electrolytic aluminum load participating in grid demand response. Background Art

[0002] With the rapid development of new energy, the power source structure of the power system has changed greatly. The proportion of new energy power generation connected to the grid is continuously increasing, bringing randomness and uncertainty. In order to suppress the grid fluctuations, the power supply side input can be balanced through the demand side. As a new flexible resource, industrial loads actively absorb new energy, which has become the main direction of future development.

[0003] As a high-energy-consuming industrial load, the electrolytic aluminum load has the characteristics of thermal energy storage, and its electric power can be adjusted within a certain range. Therefore, the electrolytic aluminum load can participate in demand response to relieve the pressure on the power system. At present, the electrolytic aluminum uses the cryolite-aluminum oxide molten salt electrolysis method. The production of electrolytic aluminum requires the electrolytic cell to operate at a high temperature of 950°C to 970°C. The electrolytic cell has a large thermal inertia, and the thermal time constant is as high as several hours. Therefore, the electrolytic aluminum can be power-adjusted on the basis of normal production.

[0004] Meanwhile, there are different subsidies for users participating in demand response. Therefore, there is an urgent need to provide a method and device for reporting the amount of electrolytic aluminum load participating in grid demand response, which can, on the basis of not affecting the normal production of electrolytic aluminum, not only assist the grid in suppressing the load curve fluctuations caused by the access of new energy, enabling the grid company to ensure the stable and reliable operation of the grid at a lower cost, but also enable the electrolytic aluminum enterprises to obtain certain economic compensation. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for reporting the amount of electrolytic aluminum load participating in grid demand response, which are used to solve problems such as how to determine the power configuration when the electrolytic aluminum load participates in grid demand response and obtain the maximum benefit. Through the optimal power configuration of the electrolytic aluminum load, the maximum benefit of the reported amount participating in grid demand response can be achieved under ideal conditions.

[0006] To achieve the above purpose, in the first aspect, the present invention provides a method for reporting the amount of electrolytic aluminum load participating in grid demand response, including: Step 1, determining the demand response subsidy and product profit loss of the electrolytic aluminum load participating in grid demand response; Step 2, calculating the total control cost of adjusting the electrolytic aluminum load according to the impact of the electrolytic aluminum load participating in grid demand response on production. The total control cost includes the electrolytic aluminum load control cost considering the anode effect of the load and the electrolytic aluminum load control cost considering the electro-thermal energy conversion of the load; Step 3: Obtain the benefits of the electrolytic aluminum load participating in the grid demand response based on the demand response subsidy, product profit loss, and total control cost, and determine the objective function and constraints of the benefits. Step 4: Find the maximum value of the objective function of the benefits, output the power configuration that achieves the maximum benefits, and then determine the reported capacity of the electrolytic aluminum load participating in the grid demand response.

[0007] According to a method for reporting the quantity of electrolytic aluminum load participating in the grid demand response provided by the present invention, the demand response subsidy is:

[0008] In the formula, is the unit subsidy price, is the actual adjusted power, is the subsidy ratio.

[0009] According to a method for reporting the quantity of electrolytic aluminum load participating in the grid demand response provided by the present invention, the product profit loss is:

[0010] In the formula, is the time for the electrolytic aluminum load to participate in the grid demand response, is the net profit of the product produced per unit of electric energy.

[0011] According to a method for reporting the quantity of electrolytic aluminum load participating in the grid demand response provided by the present invention, the electrolytic aluminum load control cost considering the anode effect of the load is:

[0012]

[0013]

[0014]

[0015]

[0016] In the formula, is the electrolytic aluminum load control cost considering the anode effect of the load, , , are the cost coefficients considering the regulation effect of the saturable reactor respectively, is the loss of electrolytic aluminum production caused by a single anode effect, is the fixed loss of a single anode effect, is the cost coefficient of a single anode effect, is the voltage regulation amount of the saturable reactor, , are the coefficients representing the coupling relationship between the probability of anode effect occurrence and the voltage regulation amount of the saturable reactor, is the initial voltage of the saturable reactor, is the rated voltage of the saturable reactor, is the equivalent back electromotive force of the electrolytic cell, is the DC side voltage of the aluminum electrolysis load, is the equivalent resistance of the electrolytic cell.

[0017] According to a method for reporting the amount of aluminum electrolysis load participating in the power grid demand response provided by the present invention, the control cost of the aluminum electrolysis load considering the conversion of load electrothermal energy is:

[0018] In the formula, , , , , are the cost coefficients considering the regulation effect of the saturable reactor respectively; is the sampling time interval; is the income per unit time of the aluminum electrolysis load at the rated temperature; is the reaction rate.

[0019] According to a method for reporting the amount of aluminum electrolysis load participating in the power grid demand response provided by the present invention, the expression of the cost coefficient considering the regulation effect of the saturable reactor is:

[0020]

[0021]

[0022]

[0023]

[0024] In the formula, c is the specific heat capacity of the molten electrolyte; m is the mass of the molten electrolyte; is the penalty cost coefficient; is the proportionality coefficient of the coupling relationship between the current efficiency and the electrolytic cell; is the working temperature of the current electrolytic cell; is the rated temperature of the electrolytic cell; , are the upper and lower limits of the temperature for normal production of the electrolytic cell respectively.

[0025] According to a method for reporting the amount of aluminum electrolysis load participating in the power grid demand response provided by the present invention, the objective function of the income of the aluminum electrolysis load participating in the power grid demand response is:

[0026] In the formula, is the objective function of the revenue of the electrolytic aluminum load participating in the power grid demand response.

[0027] According to a method for reporting the quantity of electrolytic aluminum load participating in the power grid demand response provided by the present invention, the constraint conditions for the revenue of the electrolytic aluminum load participating in the power grid demand response include:

[0028]

[0029]

[0030]

[0031] In the formula, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, are respectively the lower limit and the upper limit of the working power of the electrolytic aluminum load, are respectively the lower limit and the upper limit of the voltage drop of the saturable reactor.

[0032] According to a method for reporting the quantity of electrolytic aluminum load participating in the power grid demand response provided by the present invention, in step 4, the Lagrangian relaxation algorithm is adopted to obtain the maximum value of the objective function of the revenue.

[0033] In a second aspect, the present invention provides a device for reporting the quantity of electrolytic aluminum load participating in the power grid demand response, including: A determination unit, configured to determine the demand response subsidy and the product profit loss of the electrolytic aluminum load participating in the power grid demand response; A calculation unit, configured to calculate the total control cost of adjusting the electrolytic aluminum load according to the influence of the electrolytic aluminum load participating in the power grid demand response on production, and the total control cost includes the electrolytic aluminum load control cost considering the anode effect of the load and the electrolytic aluminum load control cost considering the electrothermal energy conversion of the load; A processing unit, configured to obtain the revenue of the electrolytic aluminum load participating in the power grid demand response based on the demand response subsidy, the product profit loss and the total control cost, and determine the objective function and the constraint conditions of the revenue; An output unit, configured to obtain the maximum value of the objective function of the revenue, output the power configuration reaching the maximum revenue, and further determine the reported capacity of the electrolytic aluminum load participating in the power grid demand response.

[0034] The technical solution of the present invention at least has the following technical effects: A method and device for reporting electrolytic aluminum load participating in power grid demand response provided by the present invention. The method includes: determining the demand response subsidy and product profit loss for the electrolytic aluminum load participating in power grid demand response; calculating the total control cost of adjusting the electrolytic aluminum load according to the impact of the electrolytic aluminum load participating in power grid demand response on production; obtaining the revenue of the electrolytic aluminum load participating in power grid demand response based on the demand response subsidy, product profit loss and total control cost, determining the objective function and constraint conditions of the revenue; finding the maximum value of the objective function of the revenue, and outputting the power configuration that reaches the maximum revenue. The present invention comprehensively considers the demand response subsidy and product profit loss, optimally configures the power of the electrolytic aluminum load, and further determines the reported capacity of the electrolytic aluminum load participating in power grid demand response, so as to achieve the maximum revenue in the ideal situation for the reported quantity of participating in power grid demand response. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] In the drawings: Figure 1 is a flowchart of the method for reporting the electrolytic aluminum load participating in power grid demand response of the present invention; Figure 2 is a structural schematic diagram of the controllable characteristic model of the electrolytic aluminum load of the present invention; Figure 3 is for the present invention based on the Lagrangian relaxation algorithm for a simple calculation result diagram; Figure 4 is for the present invention based on the Lagrangian relaxation algorithm for a simple calculation result diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0038] The following will describe in detail some embodiments of the present invention in conjunction with the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0039] The reporting method for the electrolytic aluminum load to participate in the power grid demand response of the present invention is a good model with multi-party participation and mutual benefit, which helps to improve the total economic benefits of the load-grid-source. The optimal solution can be obtained through the Lagrangian relaxation algorithm. Therefore, applying this algorithm can enable the electrolytic aluminum enterprises to achieve the maximum benefit in the ideal situation when participating in the power grid demand response.

[0040] Please refer to Figure 1 , an embodiment of the present invention provides a reporting method for the electrolytic aluminum load to participate in the power grid demand response, including: Step 1, determine the demand response subsidy and product profit loss for the electrolytic aluminum load to participate in the power grid demand response; Specifically, let the actual adjustment power be , the ratio of the actual adjustment power to the reported capacity be , the subsidy ratio be , and the unit subsidy price be , then the calculation formula for the demand response subsidy of the electrolytic aluminum load to participate in the power grid demand response is as follows:

[0041] Since the goal of the present invention is to obtain the reported capacity (abbreviated as reporting volume, in units of power), while the following calculations are for the actual adjustment power, so a conversion is made between the two. The calculation formula for the reported capacity is as follows:

[0042] Let the net profit of the product produced per unit of electric energy be , and the time for the electrolytic aluminum load to participate in the power grid demand response be , then the calculation formula for the product profit loss is as follows:

[0043] Step 2, calculate the total control cost of adjusting the electrolytic aluminum load according to the influence of the electrolytic aluminum load participating in the power grid demand response on production. The total control cost includes the electrolytic aluminum load control cost considering the anode effect of the load and the electrolytic aluminum load control cost considering the electro-thermal energy conversion of the load; It should be noted that in the present invention, the benefits of the electrolytic aluminum load participating in the power grid demand response are split into three major parts: demand response subsidy, total control cost, and product profit loss. During the period of participating in the power grid demand response, the electricity price is basically constant and set as a fixed value.

[0044] When the electrolytic aluminum load participates in the power grid demand response, the influence of the demand-side response on production is equivalently regarded as a controllable characteristic model of the electrolytic aluminum load, as Figure 2 shown, including an on-load tap-changing transformer, a saturable reactor, a diode, and an electrolytic cell ( Figure 2The vertical line behind the diode indicates the electrolytic cell), Figure 2 In is the bus voltage on the high-voltage side of the park; is the tap of the on-load tap-changer transformer; is the voltage drop of the saturable reactor; is the DC-side voltage of the aluminum electrolysis load; is the equivalent back electromotive force of the electrolytic cell; is the equivalent resistance of the electrolytic cell; is the DC-side current of the electrolytic cell.

[0045] Based on the controllable characteristic model of the aluminum electrolysis load, two core production indicators are proposed: the voltage change of the saturable reactor and the temperature of the electrolytic cell. The impact of the demand-side response on production is analyzed, that is, the control boundary and control cost of the demand-side response of the aluminum electrolysis load considering the dynamic anode effect, and the control boundary and control cost of the demand-side response of the aluminum electrolysis load considering the conversion of load electro-thermal energy.

[0046] Specifically, by referring to relevant literature, the loss caused by a single anode effect to the aluminum electrolysis production work is obtained as:

[0047] In the formula, is the fixed loss of a single anode effect, which is independent of the voltage regulation amount of the saturable reactor, is the cost coefficient of a single anode effect. is the voltage regulation amount of the saturable reactor.

[0048] Then the control cost of the aluminum electrolysis load considering the anode effect of the load is:

[0049] In the formula, , , are the cost coefficients considering the regulation effect of the saturable reactor.

[0050]

[0051]

[0052]

[0053] In the formula, , respectively represent the probability of the occurrence of the anode effect and the coupling relationship coefficient between the voltage regulation amount of the saturable reactor obtained from statistical laws. is the initial voltage of the saturable reactor, is the rated voltage of the saturable reactor. is the equivalent back electromotive force of the electrolytic cell, is the DC side voltage of the aluminum electrolysis load, is the equivalent resistance of the electrolytic cell.

[0054] The control cost of the aluminum electrolysis load considering the conversion of load electro-thermal energy is:

[0055] In the formula, , , , , are the cost coefficients considering the regulation effect of the saturable reactor, respectively.

[0056]

[0057]

[0058]

[0059]

[0060]

[0061] In the formula, c is the specific heat capacity of the molten electrolyte; m is the mass of the molten electrolyte. is the income per unit time of the aluminum electrolysis load at the rated temperature. is the reaction rate, is the penalty cost coefficient, is the proportionality coefficient of the coupling relationship between the current efficiency and the electrolytic cell, and the three are fixed values. is the sampling time interval. is the working temperature of the current electrolytic cell. is the rated temperature of the electrolytic cell; , are the upper and lower limits of the temperature for normal production of the electrolytic cell, respectively.

[0062] Step 3: Obtain the income of the aluminum electrolysis load participating in the power grid demand response based on the demand response subsidy, product profit loss and total control cost, and determine the objective function and constraint conditions of the income; Specifically, in the reporting strategy of the aluminum electrolysis load participating in the power grid regulation considering the demand response subsidy, the calculation formula of the objective function of the income of the aluminum electrolysis load participating in the power grid demand response is:

[0063] Set constraint conditions considering the actual situation, including:

[0064] The active power is within the rated range: 。

[0065] The voltage drop of the saturable reactor is within the rated range: 。

[0066]

[0067] Wherein, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, are respectively the lower limit and the upper limit of the working power of the electrolytic aluminum load, are respectively the lower limit and the upper limit of the voltage drop of the saturable reactor. Since , so is an approximate constant value.

[0068] Temperature constraint: 。

[0069] The temperature index is: 。

[0070] Given that the upper and lower limits of the production temperature of electrolytic aluminum are fixed values, then the range of variation can be obtained.

[0071] Step 4, find the maximum value of the objective function of the revenue, output the power configuration that achieves the maximum revenue, and further determine the reported capacity of the electrolytic aluminum load participating in the grid demand response.

[0072] In some embodiments, Step 4 adopts the Lagrangian relaxation algorithm to obtain the maximum value of the objective function of the revenue.

[0073] The solution process of the Lagrangian relaxation algorithm is as follows: Consider a standard model (P):

[0074]

[0075]

[0076]

[0077] Among them, x and y are non-negative decision variable vectors, D and E are parameters, and A, B, b, e1, and e2 are constants. f and d are cost coefficient vectors. The constraint set of the original problem (P) is divided into the set Ax+By=b and the set Dx≤e1, Ey≤e2, among which the equality constraint set is the "hard" constraint. Now relax the equality constraint condition, then the Lagrangian relaxation problem ( ) can be written as:

[0078]

[0079]

[0080] in, is a Lagrange multiplier. Choose the appropriate Lagrange multiplier It is helpful to improve the efficiency of the Lagrangian relaxation algorithm in solving the original problem, that is, to obtain the optimal value of the relaxation problem as the best bound of the objective function value of the original problem. The Lagrangian dual problem is usually used to search for the best multiplier, so the corresponding Lagrangian dual problem is defined as :

[0081] in, Indicates the problem ( ) is the optimal value of the objective function, the multiplier The symbols are not restricted.

[0082] because ≤P (indicates that the Lagrange dual problem is within the scope of the original problem), so we can let ( ) as a lower bound of the original problem (P). At the same time, if ( ) is feasible in the original problem (P), then P at this time can be used as an upper bound of the original problem (P).

[0083] In the present invention, and Approximate linear relationship, using to replace , then the actual problem only has two non-negative decision variables left and In the actual process and There is a certain correlation, which can be obtained by statistical laws , the two decision variables are combined. At the same time, the present invention hopes to obtain the maximum value of the objective function, but the Lagrange relaxation method seeks the minimum value, which can be obtained by inverting the objective function.

[0084] Simplifying the objective function, we can see that: the objective function contains The exponential terms, the cubic, quadratic, and linear terms, and the relevant exponential terms, the cubic, quadratic, and linear terms.

[0085] Decouple the Lagrangian relaxation problem ( ) into two sub-problems: Sub-problem 1, considering only the x decision variable:

[0086]

[0087] Sub-problem 2, considering only the y decision variable:

[0088]

[0089] Finally, a set of (x, y) values is obtained. However, at this time, (x, y) may not satisfy the rules. At this time, a heuristic algorithm is used for adjustment to make it satisfy the constraint rules.

[0090] Use the subgradient method (SubgradientMethod) to solve the multiplier .

[0091] First, select an initial value as the initial Lagrangian multiplier, and according to the rule:

[0092] Generate the sequence { } to improve the Lagrangian multiplier, where k is the current iteration number, is the optimal solution of the corresponding Lagrangian relaxation problem ( ), is the step size adopted in the k-th iteration, usually calculated by the following formula:

[0093] where, is an upper bound of the original problem (P), is a scalar and satisfies 0 < ≤ 2. If within a certain number of iterations, is not updated to a better lower bound, then is halved.

[0094] The iteration stop conditions are: ① Reach the upper limit of the maximum number of iterations; ② The difference between the obtained upper and lower bounds → 0, which indicates approaching the optimal solution; ③ "Difficult" constraint → 0, approximately considered = f = P; ④ Step size Less than the specified minimum step size indicates that the current solution can no longer be effectively adjusted further.

[0095] Based on this, the specific process of step 4 is as follows: From the calculation formula of the loss of primary aluminum production due to single anodic effect it can be seen that is positively correlated with After the derivation and simplification of relevant formulas, it can be obtained that , , are all proportional to Therefore, through mathematical calculations, it can be concluded that:

[0096] Also, because is linearly related to as shown in the following formula:

[0097] Since , so is approximately a constant value.

[0098] Substitute and with expressions related to and it can be deduced that:

[0099] In the formula: , , are coefficients representing the coupling relationship between and .

[0100] Substitute with expressions related to into the calculation formula of the primary aluminum load control cost considering the load electro-thermal energy conversion, , , , , Substitute with expressions related to

[0101] In the formula, , , , is the coefficient representing the coupling relationship between and . is the coefficient representing the coupling relationship between and .

[0102] Thus, the calculation formula of the constructed objective function is:

[0103]

[0104]

[0105] In the formula, , , is the coefficient representing the coupling relationship between and .

[0106] According to the actual situation, let the range of be [0, 70], and the range of be [950, 970].

[0107] The solution process of the Lagrangian relaxation algorithm is as follows: ① Write the Lagrangian function through nesting and iteration, substitute the coefficients and the Lagrange multiplier, and consider the coupling relationship between and to decouple the original problem.

[0108] ② Set the initial values of the step size parameters , , initialize the maximum number of iterations, and set the limiting conditions.

[0109] ③ Use the written Lagrangian function to obtain the current solution, and judge whether the current solution meets the limiting conditions.

[0110] ④ If not, iterate and update the Lagrange multiplier, and loop step ③. Until the iteration meets the stop condition, the loop terminates.

[0111] Based on the same inventive concept, another embodiment of the present invention provides a reporting device for the electrolytic aluminum load to participate in the power grid demand response. This device corresponds to the method of the foregoing embodiment. This device includes: A determination unit for determining the demand response subsidy and product profit loss of the electrolytic aluminum load participating in the power grid demand response; A calculation unit, configured to calculate the total control cost of adjusting the electrolytic aluminum load according to the impact of the electrolytic aluminum load participating in the grid demand response on production, where the total control cost includes the electrolytic aluminum load control cost considering anode effects of the load and the electrolytic aluminum load control cost considering the electro-thermal energy conversion of the load; A processing unit, configured to obtain the benefits of the electrolytic aluminum load participating in the grid demand response based on demand response subsidies, product profit losses, and the total control cost, and determine the objective function and constraint conditions of the benefits; An output unit, configured to find the maximum value of the objective function of the benefits, output the power configuration that achieves the maximum benefits, and further determine the reported capacity of the electrolytic aluminum load participating in the grid demand response.

[0112] The following is a specific embodiment of the present invention.

[0113] In this embodiment, when determining the demand response subsidy, the unit subsidy price Taking the invitation type as an example, it generally ranges from 0 to 3 yuan / kW times. In this embodiment, it is taken as 2 yuan / kW times. The subsidy ratio is related to the ratio of the actual response capacity to the winning bid capacity. Taking the ratio of the actual response capacity to the winning bid capacity as 0.8, the subsidy ratio is 80% at this time. The time for the electrolytic aluminum load to participate in the grid demand response is 1 hour (actually between 0 and 3 hours according to the Yunnan Power Demand Response Plan). The net profit of the product produced per unit of electric energy is 0.1385 yuan / kWh. The fixed loss of a single anode effect is 483, and the cost coefficient of a single anode effect is 600. The coefficients , are 0.182 and 0.263 respectively. The probability of the anode effect occurring is taken as 0.3. The specific heat capacity c of the molten electrolyte is 0.88×103 J / (kg·℃), and the mass m of the molten electrolyte is 189 kg (of course, the factory can decide according to the actual situation). The unit time income of the electrolytic aluminum load at the rated temperature is 1.800 yuan / kg. The reaction rate is taken as 2 to 4. The penalty cost coefficient is 0.6, and the proportionality coefficient of the coupling relationship between the current efficiency and the electrolytic cell is taken as -0.15% to -0.10%. The sampling time interval is 5 min. The rated temperature of the electrolytic cell is 960℃, the upper temperature limit for normal production of the electrolytic cell is 970℃, and the lower limit is 950 °C.

[0114] Figure 3 This invention is for the result graph of simple calculation, where the abscissa is the voltage regulation amount of the saturable reactor / V, and the ordinate is the revenue / yuan after the electrolytic aluminum load participates in the grid demand response. The optimal solution is 42V ， At this time, the ordinate is 11,247.6 yuan, that is, the revenue is 11,247.6 yuan.

[0115] and is approximately linearly related:

[0116] In the formula, the equivalent back electromotive force of the electrolytic cell is 354.6V, the DC side voltage of the electrolytic aluminum load is 110.3V, the equivalent resistance of the electrolytic cell = 2.016 mΩ, and the actual adjustment power is 3.76875 MW.

[0117] The ratio of the actual adjustment power to the reported capacity is , and the formula for the reported capacity is as follows:

[0118] Taking as 0.8, the actually reported capacity = 4.7109375 MW.

[0119] Because , so is an approximate constant value.

[0120] Figure 4 This invention is for the result graph of simple calculation, where the abscissa is / °C, and the ordinate is the revenue brought by the temperature change. The optimal solution is reached at 960 °C, and the revenue is 77,122.1 yuan, which is in line with the normal production situation.

[0121] In summary, the method and device for reporting electrolytic aluminum load participating in grid demand response provided by the present invention propose the coupling relationship of production losses brought about by the power regulation of electrolytic aluminum load. Considering demand response subsidies and product profit losses comprehensively, the power of electrolytic aluminum load is optimally configured. Since the electrolytic aluminum enterprise needs to increase production power during valley filling, the reported quantity is positively correlated with profit within the normal production range. The present invention mainly considers the reporting strategy of peak shaving to maximize benefits. Moreover, on the basis of not affecting the normal production of electrolytic aluminum, it can assist the grid in suppressing the load curve fluctuations caused by the access of new energy, enabling the grid company to ensure the stable and reliable operation of the grid at a lower cost; it can also enable the electrolytic aluminum enterprise to obtain certain economic compensation.

[0122] After considering the specification and the embodiments disclosed herein, those skilled in the art will readily conceive of other embodiments of the present invention. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed by the present invention. It should be understood that the present invention is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A method for reporting the amount of electrolytic aluminum load participating in power grid demand response, characterized in that: include: Determine the demand response subsidy and product profit loss for aluminum electrolytic loads participating in grid demand response; According to the influence of the electrolytic aluminum load participating in the grid demand response on production, the total control cost of adjusting the electrolytic aluminum load is calculated, wherein the total control cost includes the electrolytic aluminum load control cost considering the load anode effect and the electrolytic aluminum load control cost considering the load electric heat energy conversion; Based on the demand response subsidy, product profit loss and total control cost, the benefits of the electrolytic aluminum load participating in the grid demand response are obtained, and the objective function and constraint conditions of the benefits are determined; The maximum value of the objective function of the benefit is obtained, and the power configuration that achieves the maximum benefit is output, thereby determining the reporting capacity of the electrolytic aluminum load participating in the grid demand response.

2. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 1 is characterized in that: The demand response subsidy is: In the formula, Subsidy price for the unit, To actually adjust the power, The proportion of subsidy.

3. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 2 is characterized in that: The product profit loss is: In the formula, is the time when the electrolytic aluminum load participates in the grid demand response, It is the net profit of products produced per unit of electrical energy.

4. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 3 is characterized in that: The electrolytic aluminum load control cost considering the load anode effect is: In the formula, To consider the load anode effect of electrolytic aluminum load control cost, , , are the cost coefficients considering the regulation effect of saturated reactor, is the loss of electrolytic aluminum production due to single anode effect, is the fixed loss of single anode effect, is the cost coefficient of the single anode effect, is the voltage regulation value of the saturated reactor, , are the coefficients representing the coupling relationship between the probability of anode effect and the voltage regulation of the saturated reactor, is the initial voltage of the saturated reactor, is the rated voltage of the saturated reactor, is the equivalent back electromotive force of the electrolytic cell, is the DC side voltage of the electrolytic aluminum load, is the equivalent resistance of the electrolytic cell.

5. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 4 is characterized in that: The electrolytic aluminum load control cost considering load electric heat energy conversion is: In the formula, , , , , are the cost coefficients considering the regulation effect of saturated reactor respectively; is the sampling time interval; The unit time benefit of electrolytic aluminum load at rated temperature; is the reaction rate.

6. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 5 is characterized in that: The expression of the cost coefficient considering the regulation effect of the saturated reactor is: Where c is the specific heat capacity of the molten electrolyte; m is the mass of the molten electrolyte; is the penalty cost coefficient; is the proportionality coefficient of the coupling relationship between the current efficiency and the electrolytic cell; is the current operating temperature of the electrolyzer; is the rated temperature of the electrolytic cell; , They are respectively the upper and lower temperature limits for normal production of the electrolytic cell.

7. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 6 is characterized in that: The objective function of the benefits of the electrolytic aluminum load participating in the grid demand response is: In the formula, The objective function is the benefit of electrolytic aluminum load participating in grid demand response.

8. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 7 is characterized in that: The constraints on the benefits of the electrolytic aluminum load participating in the grid demand response include: In the formula, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, They are the lower and upper limits of the electrolytic aluminum load working power, They are respectively the saturated reactor voltage drop The lower and upper limits.

9. The method for reporting the amount of electrolytic aluminum load participating in the grid demand response according to claim 1, characterized in that: The Lagrangian relaxation algorithm is used to obtain the maximum value of the objective function of the benefit.

10. A reporting device for electrolytic aluminum load participating in power grid demand response, characterized in that: include: A determination unit, used to determine a demand response subsidy and a product profit loss for the electrolytic aluminum load participating in the grid demand response; A calculation unit, used for calculating the total control cost of adjusting the electrolytic aluminum load according to the influence of the electrolytic aluminum load participating in the grid demand response on production, wherein the total control cost includes the electrolytic aluminum load control cost considering the load anode effect and the electrolytic aluminum load control cost considering the load electric heat energy conversion; A processing unit, configured to obtain the benefit of the electrolytic aluminum load participating in the grid demand response based on the demand response subsidy, product profit loss and total control cost, and determine the objective function and constraint conditions of the benefit; The output unit is used to find the maximum value of the objective function of the benefit, output the power configuration that achieves the maximum benefit, and then determine the reporting capacity of the electrolytic aluminum load participating in the grid demand response.

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