A method and device for reporting the amount of electrolytic aluminum load participating in power grid demand response

Abstract

The present invention provides a method and device for reporting the amount of electrolytic aluminum load participating in grid demand response, and relates to the field of power system operation and control technology. The method includes: determining the demand response subsidy and product profit loss for the electrolytic aluminum load participating in grid demand response; calculating the total control cost of adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load participating in grid demand response on production; obtaining the benefits of the electrolytic aluminum load participating in grid demand response based on the demand response subsidy, product profit loss, and total control cost, and determining the objective function and constraints of the benefits; finding the maximum value of the objective function of the benefits, and outputting the power configuration that achieves the maximum benefit. The present invention comprehensively considers the demand response subsidy and product profit loss, optimizes the power configuration of the electrolytic aluminum load, and can achieve the maximum benefit of the reported amount participating in grid demand response under ideal conditions.

Description

Technical Field

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

[0002] The rapid development of renewable energy has significantly altered the power system's power structure. The proportion of renewable energy generation connected to the grid is increasing, introducing randomness and uncertainty. To mitigate grid fluctuations, demand-side power supply input can be balanced. Actively absorbing renewable energy as a new flexible resource, industrial loads, will become a key area 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 and alleviate the pressure on the power system. Currently, electrolytic aluminum uses cryolite-alumina molten salt electrolysis. The production of electrolytic aluminum requires the electrolytic cell to operate at a high temperature of 950℃ to 970℃. The electrolytic cell has a large thermal inertia and a thermal time constant of up to several hours. Therefore, the power of electrolytic aluminum can be adjusted based on normal production.

[0004] At the same time, 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. This method can not only assist the grid in smoothing the load curve fluctuations caused by the access of new energy without affecting the normal production of electrolytic aluminum, so that the grid company can ensure the stable and reliable operation of the grid at a lower cost, but also allow 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 the grid demand response, which is used to solve the problems of how to determine the power configuration of the electrolytic aluminum load when participating in the grid demand response and obtain the maximum benefit. By optimizing the power configuration of the electrolytic aluminum load, the reported amount of participation in the grid demand response can achieve the maximum benefit under ideal conditions.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a method for reporting the amount of electrolytic aluminum load participating in grid demand response, comprising:

[0007] Step 1: Determine the demand response subsidy and product profit loss for the electrolytic aluminum load participating in grid demand response;

[0008] Step 2: Calculate the total control cost of adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load participating in the grid demand response on production. 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;

[0009] Step 3: 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 constraints of the benefits are determined;

[0010] Step 4: Find the maximum value of the objective function of 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.

[0011] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the demand response subsidy is:

[0012]

[0013] Where, Subsidy price for the unit, To actually adjust the power, The proportion of subsidy.

[0014] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the product profit loss is:

[0015]

[0016] Where, is the time for electrolytic aluminum load to participate in grid demand response, It is the net profit of products produced per unit of electricity.

[0017] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the electrolytic aluminum load control cost considering the load anode effect is:

[0018]

[0019]

[0020]

[0021]

[0022]

[0023] Where, In order 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.

[0024] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the electrolytic aluminum load control cost considering the load electric-thermal energy conversion is:

[0025]

[0026] Where, 、 、 、 、 are the cost coefficients considering the regulation effect of saturated reactor; is the sampling time interval; The unit time benefit of electrolytic aluminum load at rated temperature; is the reaction rate.

[0027] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the expression of the cost coefficient considering the regulation effect of the saturated reactor is:

[0028]

[0029]

[0030]

[0031]

[0032]

[0033] 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 proportional coefficient of the coupling relationship between current efficiency and 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.

[0034] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the objective function of the benefit of electrolytic aluminum load participating in grid demand response is:

[0035]

[0036] Where, The objective function is the benefit of electrolytic aluminum load participating in grid demand response.

[0037] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, the constraints on the benefits of the electrolytic aluminum load participating in grid demand response include:

[0038]

[0039]

[0040]

[0041]

[0042] Where, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, are the lower limit and upper limit of the electrolytic aluminum load working power, They are the lower limit and upper limit of the saturated reactor voltage drop respectively.

[0043] According to a method for reporting the amount of electrolytic aluminum load participating in grid demand response provided by the present invention, step 4 adopts the Lagrangian relaxation algorithm to obtain the maximum value of the objective function of the benefit.

[0044] In a second aspect, the present invention provides a device for reporting electrolytic aluminum loads participating in grid demand response, comprising:

[0045] a determination unit for determining a demand response subsidy and a product profit loss for an electrolytic aluminum load participating in grid demand response;

[0046] a calculation unit for calculating the total control cost of adjusting the electrolytic aluminum load based on the impact 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;

[0047] a processing unit, configured to 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 constraint conditions of the benefits;

[0048] The output unit is used to find the maximum value of the objective function of 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.

[0049] The technical solution of the present invention has at least the following technical effects:

[0050] The present invention provides a method and device for reporting the amount of electrolytic aluminum load participating in grid demand response. The method includes: determining the demand response subsidy and product profit loss for the electrolytic aluminum load participating in grid demand response; calculating the total control cost of adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load participating in grid demand response on production; obtaining the benefits of the electrolytic aluminum load participating in grid demand response based on the demand response subsidy, product profit loss, and total control cost, and determining the objective function and constraints of the benefits; finding the maximum value of the objective function of the benefits, and outputting the power configuration that achieves the maximum benefit. The present invention comprehensively considers the demand response subsidy and product profit loss, optimizes the power configuration of the electrolytic aluminum load, and then determines the reporting capacity of the electrolytic aluminum load participating in grid demand response, which can achieve the maximum benefit of the reported amount of participation in grid demand response under ideal conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] In the attached figure:

[0053] Figure 1 This is a flow chart of a method for reporting the amount of electrolytic aluminum load participating in grid demand response according to the present invention;

[0054] Figure 2 Schematic diagram of the structure of the load controllable characteristic model of electrolytic aluminum according to the present invention;

[0055] Figure 3 The present invention is based on the Lagrangian relaxation algorithm Graphs of results from simple calculations;

[0056] Figure 4 The present invention is based on the Lagrangian relaxation algorithm A graph showing the results of a simple calculation. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0058] The following will describe some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0059] The proposed method for reporting the amount of electrolytic aluminum loads participating in grid demand response is a promising model for multi-party participation and mutual benefit, helping to improve the overall economic benefits of the load-grid-source relationship. The Lagrangian relaxation algorithm, which yields an optimal solution, can be used to maximize the benefits of electrolytic aluminum enterprises participating in grid demand response.

[0060] See also Figure 1 The embodiment of the present invention provides a method for reporting the amount of electrolytic aluminum load participating in grid demand response, including:

[0061] Step 1: Determine the demand response subsidy and product profit loss for the electrolytic aluminum load participating in grid demand response;

[0062] Specifically, let the actual adjustment power be , the ratio of actual adjustment power to reported capacity is The subsidy ratio is , the unit subsidy price is , then the calculation formula for the demand response subsidy for electrolytic aluminum load participating in grid demand response is as follows:

[0063]

[0064] Because the goal of this invention is to obtain the reported capacity (abbreviated as reported capacity, in units of power), and the following calculation is the actual adjustment power, the two are converted and the reported capacity is The calculation formula is as follows:

[0065]

[0066] Assume that the net profit of the product produced per unit of electricity is , the time for electrolytic aluminum load to participate in grid demand response is , then the calculation formula for product profit loss is as follows:

[0067]

[0068] Step 2: Calculate the total control cost of adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load participating in the grid demand response on production. 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;

[0069] It should be noted that the present invention divides the benefits of electrolytic aluminum loads participating in grid demand response into three parts: demand response subsidies, total control costs, and product profit losses. During the period of participation in grid demand response, the electricity price is basically constant and set at a fixed value.

[0070] When the electrolytic aluminum load participates in the grid demand response, the impact of the demand-side response on production is equivalent to a controllable characteristic model of the electrolytic aluminum load, such as Figure 2 As shown, it includes on-load tap-changing transformer, saturated reactor, diode and electrolytic cell ( Figure 2 The vertical line behind the diode represents the electrolytic cell). Figure 2 middle, is the bus voltage on the high-voltage side of the park; Tap changer for on-load tap-changing transformer; is the saturated reactor voltage drop; is the DC side voltage of electrolytic aluminum 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.

[0071] Based on the controllable characteristic model of electrolytic aluminum load, two core production indicators are proposed: saturated reactor voltage change and electrolytic cell temperature, and the impact of demand-side response on production is analyzed, namely, the control boundary and control cost of electrolytic aluminum load demand-side response considering dynamic anode effect, and the control boundary and control cost of electrolytic aluminum load demand-side response considering load electrothermal energy conversion.

[0072] Specifically, after consulting relevant literature, it is concluded that the loss caused by the single anode effect to the electrolytic aluminum production is:

[0073]

[0074] Where, is the fixed loss of the single anode effect, which has nothing to do with the voltage regulation of the saturated reactor. is the cost coefficient of single anode effect. is the voltage regulation value of the saturated reactor.

[0075] Considering the electrolytic aluminum load control cost caused by the load anode effect for:

[0076]

[0077] Where, 、 、 is the cost coefficient considering the regulation effect of saturated reactor.

[0078]

[0079]

[0080]

[0081] Where, 、 are the probabilities of anode effect occurrence and saturated reactor voltage regulation The coefficient of the coupling relationship between them is obtained by statistical laws. 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.

[0082] Load control cost of electrolytic aluminum considering load-electricity-heat energy conversion for:

[0083]

[0084] Where, 、 、 、 、 are the cost coefficients considering the regulation effect of saturated reactor.

[0085]

[0086]

[0087]

[0088]

[0089]

[0090] Where c is the specific heat capacity of the molten electrolyte; m is the mass of the molten electrolyte. It is the benefit per unit time of electrolytic aluminum load at rated temperature. is the reaction rate, is the penalty cost coefficient, is the proportional coefficient of the coupling relationship between current efficiency and electrolytic cell, and the three are constants. is the sampling time interval. 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.

[0091] Step 3: 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 constraints of the benefits are determined;

[0092] Specifically, in the reporting strategy for the electrolytic aluminum load to participate in grid regulation considering the demand response subsidy, the calculation formula for the objective function of the benefits of the electrolytic aluminum load participating in grid demand response is:

[0093]

[0094] Consider the actual situation and set constraints, including:

[0095]

[0096] Active power is within the rated range: .

[0097] The voltage drop of the saturated reactor is within the rated range: .

[0098]

[0099] Where, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, are the lower limit and upper limit of the electrolytic aluminum load working power, are the lower and upper limits of the saturated reactor voltage drop respectively. ,so Approximately constant value.

[0100] Temperature constraints: .

[0101] The temperature index is: .

[0102] If the upper and lower limits of the production temperature of electrolytic aluminum are known to be fixed, we can obtain range of change.

[0103] Step 4: Find the maximum value of the objective function of 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.

[0104] In some embodiments, step 4 uses a Lagrangian relaxation algorithm to obtain the maximum value of the objective function of the benefit.

[0105] The solution process of the Lagrangian relaxation algorithm is as follows:

[0106] Consider a standard model (P):

[0107]

[0108]

[0109]

[0110]

[0111] Where 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. The equality constraint set is the "hard" constraint. Now relax the equality constraint condition, then the Lagrangian relaxation problem ( ) can be written as:

[0112]

[0113]

[0114]

[0115] 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, the optimal value of the relaxation problem is 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 :

[0116]

[0117] in, Indicates the problem ( )’s optimal value of the objective function, the multiplier The symbols are not restricted.

[0118] 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).

[0119] 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. Meanwhile, 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 achieved by simply inverting the objective function.

[0120] Simplifying the objective function, we can see that: the objective function contains The exponential terms and the third, second and first terms, as well as the related The exponential term and the third, second, and first terms.

[0121] The Lagrangian relaxation problem ( ) decoupled into two sub-problems:

[0122] Subproblem 1: Consider only the x decision variable:

[0123]

[0124]

[0125] Subproblem 2: Consider only the y decision variable:

[0126]

[0127]

[0128] Finally, a set of (x, y) values ​​is obtained, but at this time (x, y) may not satisfy At this time, the heuristic algorithm should be used to adjust it to meet the constraint rules.

[0129] Use the subgradient method to solve the multiplier .

[0130] First, select an initial value as the initial Lagrange multiplier and follow the rules:

[0131]

[0132] Generate a sequence {}Improved Lagrange multiplier, where k is the current iteration number, is the corresponding Lagrangian relaxation problem ( ), is the step size used in the kth iteration, usually calculated by the following formula:

[0133]

[0134] in, is an upper bound of the original problem (P), is a scalar and satisfies 0< ≤2, if within a certain number of iterations, If no better lower bound is updated, Halved.

[0135] The iteration stopping condition is:

[0136] ①The upper limit of the maximum number of iterations is reached;

[0137] ②The difference between the upper and lower bounds obtained →0, which means it is close to the optimal solution;

[0138] ③ “Difficult” constraints →0, approximately =f =P;

[0139] ④ Step length If the step size is smaller than the specified minimum step size, it means that the current solution can no longer be effectively adjusted.

[0140] Based on this, the specific process of step 4 is as follows:

[0141] Losses in electrolytic aluminum production due to single anode effect From the calculation formula, we can see that and After deducing and simplifying the relevant formula, we can get 、 、 Both Proportional, therefore, through mathematical calculation, we can conclude that:

[0142]

[0143] Also because and There is a linear relationship, as shown in the following formula:

[0144]

[0145] because ,so Approximately constant value.

[0146] Will and Use with Substituting the relevant formulas, we can derive:

[0147]

[0148] Where: 、 、 To express and The coefficient of the coupling relationship between them.

[0149] Will Use with Substituting the relevant formula into the electrolytic aluminum load control cost considering the load electric heat energy conversion The calculation formula is: 、 、 、 、 Use with Substituting the relevant formulas, we can derive:

[0150]

[0151] Where, 、 、 、 To express and The coefficient of the coupling relationship between To express and The coefficient of the coupling relationship between them.

[0152] The objective function thus constructed The calculation formula is:

[0153]

[0154]

[0155]

[0156] Where, 、 、 To express and The coefficient of the coupling relationship between them.

[0157] According to the actual situation, The range is [0, 70], The range is [950, 970].

[0158] The solution process of the Lagrangian relaxation algorithm is:

[0159] ① Write the Lagrange function by nesting and iteratively, substitute the coefficients and Lagrange multipliers, and consider and The coupling relationship between them is solved to decouple the original problem.

[0160] ②Set the step size parameters 、 Initial value of , initialize the maximum number of iterations, and set the restriction conditions.

[0161] ③ Use the Lagrangian function to obtain the current solution and determine whether the current solution meets the constraints.

[0162] ④If not, iteratively update the Lagrange multiplier and repeat step ③ until the iteration meets the stopping condition.

[0163] Based on the same inventive concept, another embodiment of the present invention provides a device for reporting the amount of electrolytic aluminum load participating in grid demand response. The device corresponds to the method of the aforementioned embodiment, and includes:

[0164] a determination unit for determining a demand response subsidy and a product profit loss for an electrolytic aluminum load participating in grid demand response;

[0165] a calculation unit for calculating the total control cost of adjusting the electrolytic aluminum load based on the impact 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;

[0166] a processing unit, configured to 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 constraint conditions of the benefits;

[0167] The output unit is used to find the maximum value of the objective function of 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.

[0168] The following is a specific embodiment of the present invention.

[0169] In this embodiment, when determining the demand response subsidy, the unit subsidy price is Taking the invitation type as an example, the price is generally 0~3 yuan / kilowatt In this embodiment, 2 yuan / kilowatt is used. times. The proportion of subsidies It is related to the ratio of actual response capacity to winning bid capacity. If the ratio of actual response capacity to winning bid capacity is 0.8, the subsidy ratio is The time when electrolytic aluminum load participates in grid demand response is 80%. The net profit of products produced per unit of electricity is 1 hour (actually, it is between 0 and 3 hours according to the Yunnan Province power demand response plan). The fixed loss of a single anode effect is RMB 0.1385 / kWh. The cost coefficient of the single anode effect is 483. is 600. Coefficient 、 The probability of anode effect is 0.182 and 0.263 respectively. Take 0.3. The specific heat capacity c of the molten electrolyte is 0.88×103 J / (kg·℃), the mass m of the molten electrolyte is 189 kg (of course, the factory can decide according to the actual situation), and the electrolytic aluminum load unit time benefit at rated temperature is The reaction rate is 1.800 yuan / kg. Take 2 to 4. Penalty cost coefficient The proportional coefficient of the coupling relationship between current efficiency and electrolytic cell is 0.6. Take -0.15%~-0.10%. Sampling time interval 5min. Rated temperature of electrolytic cell 960℃, the upper limit of normal production temperature of electrolytic cell 970℃, lower limit It is 950℃.

[0170] Figure 3 For the present invention The result of a simple calculation is shown in the figure, where the horizontal axis is the voltage regulation of the saturated reactor / V, the vertical axis is the income / yuan after the electrolytic aluminum load participates in the grid demand response, the optimal solution is 42V ， At this time, the vertical axis is 11,247.6 yuan, that is, the profit is 11,247.6 yuan.

[0171] and Approximately linear relationship:

[0172]

[0173] Where, the equivalent back electromotive force of the electrolytic cell is The DC side voltage of the electrolytic aluminum load is 354.6V. is 110.3V, the equivalent resistance of the electrolytic cell =2.016mΩ, actual adjustment power It is 3.76875MW.

[0174] The ratio of actual adjusted power to reported capacity is , the capacity reporting formula is as follows:

[0175]

[0176] Pick If it is 0.8, the actual reported capacity =4.7109375MW.

[0177] because ,so Approximately constant value.

[0178] Figure 4 For the present invention The result of a simple calculation is shown in the figure, where the horizontal axis is The vertical axis represents the profit brought by temperature change. The optimal solution is reached at 960°C, with a profit of 77,122.1 yuan, which is consistent with normal production conditions.

[0179] In summary, the present invention provides a method and device for reporting the amount of electrolytic aluminum load participating in the grid demand response, proposes a coupling relationship between the production loss caused by the power regulation of the electrolytic aluminum load, comprehensively considers the demand response subsidy and the product profit loss, and optimizes the power configuration of the electrolytic aluminum load. Because electrolytic aluminum enterprises need to increase production power during valley filling, the reporting amount is positively correlated with profit within the normal production range. The present invention mainly considers a peak-shaving reporting strategy to maximize profits. It can also assist the power grid in smoothing the load curve fluctuations caused by the access of new energy without affecting the normal production of electrolytic aluminum, so that the power grid company can ensure the stable and reliable operation of the power grid at a lower cost; it can also allow electrolytic aluminum enterprises to obtain certain economic compensation.

[0180] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and variations can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for reporting the amount of electrolytic aluminum load participating in grid demand response, characterized in that: include: Determine the demand response subsidies and product profit losses for electrolytic aluminum loads participating in grid demand response; Calculate the total control cost of adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load participating in the grid demand response on production, the total control cost including 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; Obtaining the benefits of the electrolytic aluminum load participating in grid demand response based on the demand response subsidy, product profit loss, and total control cost, and determining the objective function and constraints of the benefits; Calculating the maximum value of the objective function of the benefit, outputting the power configuration that achieves the maximum benefit, and then determining the reporting capacity of the electrolytic aluminum load participating in the grid demand response; The demand response subsidy, product profit loss, electrolytic aluminum load control cost considering load anode effect, and electrolytic aluminum load control cost considering load electrothermal energy conversion are all related to the actual adjustment power; The actual adjusted power is: Where, To actually adjust the power, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, They are respectively the lower limit and upper limit of the electrolytic aluminum load working power.

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

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

4. The method for reporting the amount of electrolytic aluminum load participating in grid demand response according to claim 3 is characterized in that: The electrolytic aluminum load control cost considering the load anode effect is: Where, In order 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, R AL is the equivalent resistance of the electrolytic cell.

5. The method for reporting the amount of electrolytic aluminum load participating in grid demand response according to claim 4, characterized in that: The electrolytic aluminum load control cost considering load electric-thermal energy conversion is: Where, 、 、 、 、h T are the cost coefficients considering the regulation effect of saturated reactor; is the sampling time interval; The unit time benefit of electrolytic aluminum load at rated temperature; is the reaction rate; 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 proportional coefficient of the coupling relationship between current efficiency and 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.

6. The method for reporting the amount of electrolytic aluminum load participating in grid demand response according to claim 5, characterized in that: The objective function of the benefits of the electrolytic aluminum load participating in the grid demand response is: Where, The objective function is the benefit of electrolytic aluminum load participating in grid demand response.

7. The method for reporting the amount of electrolytic aluminum load participating in grid demand response according to claim 6, characterized in that: The constraints on the benefits of the electrolytic aluminum load participating in grid demand response include: Where, They are saturated reactor voltage drops The lower and upper limits.

8. The method for reporting the amount of electrolytic aluminum load participating in 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.

9. A reporting device for electrolytic aluminum load participating in grid demand response, characterized in that: include: a determination unit for determining a demand response subsidy and product profit loss for electrolytic aluminum loads participating in grid demand response; a calculation unit, configured to calculate a total control cost for adjusting the electrolytic aluminum load based on the impact of the electrolytic aluminum load's participation in grid demand response on production, wherein the total control cost includes an electrolytic aluminum load control cost taking into account anode effect of the load and an electrolytic aluminum load control cost taking into account electrothermal energy conversion of the load; a processing unit, configured to obtain a benefit of the electrolytic aluminum load participating in grid demand response based on the demand response subsidy, product profit loss, and total control cost, and determine an objective function and constraint conditions for the benefit; An 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; The demand response subsidy, product profit loss, electrolytic aluminum load control cost considering load anode effect, and electrolytic aluminum load control cost considering load electrothermal energy conversion are all related to the actual adjustment power; The actual adjusted power is: Where, To actually adjust the power, is the actual working power of the electrolytic aluminum load, is the rated working power of the electrolytic aluminum load, They are respectively the lower limit and upper limit of the electrolytic aluminum load working power.

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