A load shedding method, device and apparatus

Abstract

The present invention provides a load shedding method, device and equipment, which relates to the field of energy technology. The method includes obtaining a target load amount; the target load amount is the load amount that needs to be sheared off by the power grid; according to the difference between the target load amount and the shearable load amount of the first aluminum plant, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in sequence; wherein the first aluminum plant represents an aluminum plant using a small closed-loop control; the second aluminum plant represents an aluminum plant using a large closed-loop control. The method of the embodiment of the present application realizes accurate and graded load shedding.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and in particular to a load shedding method, device and equipment. Background Art

[0002] At present, when a power grid fails, load control is mainly carried out through the second line of defense safety and stability control system to cut off the load and prevent the fault from further expanding.

[0003] In the related technology, the electrolytic aluminum load has a large capacity and high concentration. When a fault occurs, all the electrolytic aluminum loads are cut off, which is easy to cause large economic losses. Over-cutting the load may also cause high voltage problems or thermal stability problems in weak grid areas, which is easy to trigger power accidents and cause great impacts. Therefore, how to accurately cut the load of aluminum plants is a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The present invention provides a load shedding method, device and equipment, which realize accurate and graded load shedding.

[0005] The present invention provides a load shedding method, comprising the following steps.

[0006] Obtaining a target load amount; the target load amount is the load amount that needs to be removed from the power grid;

[0007] According to the difference between the target load and the cutable load of the first aluminum plant, the load removal amount of the first aluminum plant, the load removal amount of the second aluminum plant and the load removal amount of the public station are determined in turn; among them, the first aluminum plant represents an aluminum plant adopting small closed-loop control; the second aluminum plant represents an aluminum plant adopting large closed-loop control.

[0008] According to a load shedding method provided by the present invention, obtaining a target load amount includes:

[0009] The target load is determined according to the initial power of the power grid detection section and the preset threshold value of the fault.

[0010] According to a load shedding method provided by the present invention, the target load is determined according to the initial power of the power grid detection section and the preset threshold value of the fault, including:

[0011] The target load is determined as follows:

[0012] ;

[0013] in, Indicates the target load; Indicates the initial power of the power grid detection section; Indicates the preset threshold value of the fault.

[0014] According to a load shedding method provided by the present invention, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in sequence according to the difference between the target load amount and the shedding load amount of the first aluminum plant, including:

[0015] When the difference between the target load and the load shedding amount of the first aluminum plant is less than or equal to 0, the load shedding amount of the first aluminum plant is equal to the target load, and the load shedding amount of the second aluminum plant and the load shedding amount of the public station are both 0;

[0016] In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is less than the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first number is the minimum number of rectifier transformers that can be sheared by the second aluminum plant;

[0017] In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is equal to the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shearable load corresponding to the first number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0018] In the case where the difference between the target load and the cuttable load of the first aluminum plant is greater than 0, the difference is greater than the cuttable load corresponding to the first number of rectifier transformers of the second aluminum plant and the difference is less than the cuttable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cuttable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cuttable load corresponding to the first number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load; the second number is the maximum number of rectifier transformers that can be cut by the second aluminum plant;

[0019] In the case where the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0020] When the difference between the target load and the cutable load of the first aluminum plant is greater than 0, and the difference is greater than the cutable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cutable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cutable load corresponding to the second number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load.

[0021] According to a load shedding method provided by the present invention, the first quantity and the second quantity are determined according to a first constraint condition and a second constraint condition; wherein the first constraint condition is the constraint condition of the electrolytic cell insulation current corresponding to when the load of the second aluminum plant is shelved; and the second constraint condition is the constraint condition of the rectifier transformer initial current corresponding to when the load of the second aluminum plant is shelved.

[0022] According to a load shedding method provided by the present invention, the first constraint condition includes:

[0023] ;

[0024] Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the electrolytic cell insulation current coefficient; Indicates the rated current of the electrolytic cell;

[0025] The second constraint condition includes:

[0026] ;

[0027] Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the initial current of a single rectifier transformer.

[0028] The present invention also provides a load shedding device, comprising the following modules:

[0029] An acquisition module is used to acquire a target load amount; the target load amount is the load amount that needs to be removed from the power grid;

[0030] The load shedding module is used to determine the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station in turn according to the difference between the target load and the load shedding amount of the first aluminum plant; wherein, the first aluminum plant represents an aluminum plant adopting small closed-loop control; the second aluminum plant represents an aluminum plant adopting large closed-loop control.

[0031] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, any of the load shedding methods described above is implemented.

[0032] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the load shedding method described in any one of the above is implemented.

[0033] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the load shedding method described above is implemented.

[0034] The load shedding method, device and equipment provided by the present invention take into account the transformation of the control mode of the aluminum plant according to the load flow transfer characteristics of the electrolytic aluminum load, and give priority to the load shedding of the first aluminum plant, without the need to shelve the entire rectifier transformer, thereby achieving the effect of refined load shedding; and then the load shedding of the second aluminum plant and the public station is carried out in turn, realizing precise and graded load shedding, which can not only meet the emergency response in emergency situations of the power grid, but also reduce the economic losses of users, and to a certain extent improve the acceptance of the receiving power grid for the electrolytic aluminum load, and improve the refinement level of the stabilization control system under the premise of ensuring the safety and stability of the power grid. 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 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 creative work.

[0036] Figure 1 It is one of the flow charts of the load shedding method provided by the present invention.

[0037] Figure 2 It is a structural schematic diagram of the load shedding device provided by the present invention.

[0038] Figure 3 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Combine the following Figure 1-Figure 3 The load shedding method, apparatus and device of the present invention are described.

[0041] Figure 1 is one of the flow charts of the load shedding method provided by the present invention, such as Figure 1 As shown, the method includes the following:

[0042] Step 100: Obtain a target load; the target load is the load that needs to be removed from the power grid.

[0043] Specifically, in the related art, the electrolytic aluminum load has a large capacity and high concentration. When a fault occurs, all the electrolytic aluminum loads are cut off, which can easily cause large economic losses. Over-cutting the load may also cause high voltage problems or thermal stability problems in weak grid areas, which can easily trigger power accidents and cause great impacts. Therefore, how to accurately cut the load of aluminum plants is a technical problem that technicians in this field need to solve urgently.

[0044] In order to solve the above problem, in the embodiment of the present application, the target load is firstly obtained; wherein the target load is the load that needs to be removed from the power grid.

[0045] For example, firstly, a power grid data model is established, and a power flow file is generated according to the operation mode. When a busbar fault or a double-circuit line N-2 fault occurs on the same tower, the stability control system issues a load shedding command, and the load shedding command carries the load amount to be shelved.

[0046] Step 200, according to the difference between the target load and the cutable load of the first aluminum plant, determine the load removal amount of the first aluminum plant, the load removal amount of the second aluminum plant and the load removal amount of the public station in turn; wherein, the first aluminum plant represents an aluminum plant adopting small closed-loop control; the second aluminum plant represents an aluminum plant adopting large closed-loop control.

[0047] Specifically, after obtaining the target load, that is, obtaining the load that needs to be cut off from the power grid, in the embodiment of the present application, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant, and the load shedding amount of the public station are determined in sequence according to the difference between the target load and the shedding load of the first aluminum plant; that is, after obtaining the load that needs to be cut off from the power grid, the load shedding of the first aluminum plant, the load shedding of the second aluminum plant, and the load shedding of the public station are performed in sequence, and the load shedding of the first aluminum plant, the load shedding of the second aluminum plant, and the load shedding of the public station are realized based on the load characteristics. Optionally, the first aluminum plant represents an aluminum plant that adopts a small closed-loop control, so the load shedding of the first aluminum plant is given priority in the process of graded load shedding, which can ensure that the rectifier transformer current does not exceed the target setting value, and there is no need to cut the entire rectifier transformer, so that refined load shedding can be realized; optionally, after the load shedding of the first aluminum plant, if load shedding is still required, the load shedding of the second aluminum plant and the public station can be performed in sequence, and the load shedding of the first aluminum plant and the public station can be realized based on the load characteristics.

[0048] It should be noted that if a large closed-loop control is used between the rectifier units of the aluminum electrolytic plant, after any one or more rectifier transformers trip due to a fault, their current is borne by the remaining rectifier transformers, the load is transferred, and the actual load shedding amount cannot be determined. In this application, the first aluminum plant that adopts a small closed-loop control is preferentially load shedding to ensure that the rectifier transformer current does not exceed the target setting value, and there is no need to shear the entire rectifier transformer, thereby achieving the effect of refined load shedding.

[0049] The method of the above embodiment, based on the load flow transfer characteristics of the electrolytic aluminum load and considering the transformation of the aluminum plant control mode, gives priority to the load shedding of the first aluminum plant, without cutting the entire rectifier transformer, thereby achieving the effect of refined load shedding; then the load shedding of the second aluminum plant and the public station is carried out in turn, realizing precise and graded load shedding, which can not only meet the emergency response in emergency situations of the power grid, but also reduce the economic losses of users, and to a certain extent improve the acceptance of the receiving power grid for the electrolytic aluminum load, and improve the refinement level of the stabilization control system under the premise of ensuring the safety and stability of the power grid.

[0050] In one embodiment, obtaining the target load includes:

[0051] The target load is determined based on the initial power of the power grid detection section and the preset threshold value of the fault.

[0052] Specifically, in the embodiment of the present application, the target load is determined according to the initial power of the power grid detection section and the threshold value preset for the fault, that is, the load to be removed is determined. Optionally, when the initial power of the power grid detection section is less than or equal to the threshold value preset for the fault, it indicates that the power grid load is small and no load removal is required; when the initial power of the power grid detection section is greater than the threshold value preset for the fault, it indicates that the power grid load is large and load removal is required.

[0053] In one embodiment, the target load is determined according to the initial power of the power grid detection section and the preset threshold value of the fault, including:

[0054] The target load is determined as follows:

[0055] ;

[0056] in, Indicates the target load; Indicates the initial power of the power grid detection section; Indicates the preset threshold value of the fault.

[0057] Specifically, in the embodiment of the present application, the difference between the initial power of the power grid detection section and the preset threshold value of the fault is used as the target load, that is, the load to be removed, so as to quickly and accurately determine the load to be removed, and thus effectively improve the efficiency and accuracy of graded load removal.

[0058] In one embodiment, according to the difference between the target load and the load shedding amount of the first aluminum plant, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the utility station are determined in sequence, including:

[0059] When the difference between the target load and the load that can be cut of the first aluminum plant is less than or equal to 0, the load removal amount of the first aluminum plant is equal to the target load, and the load removal amount of the second aluminum plant and the load removal amount of the public station are both 0;

[0060] When the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is less than the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first number is the minimum number of rectifier transformers that can be sheared by the second aluminum plant;

[0061] When the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the first number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0062] In the case where the difference between the target load and the cuttable load of the first aluminum plant is greater than 0, the difference is greater than the cuttable load corresponding to the first number of rectifier transformers of the second aluminum plant and the difference is less than the cuttable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cuttable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cuttable load corresponding to the first number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load; the second number is the maximum number of rectifier transformers that can be cut by the second aluminum plant;

[0063] When the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0064] When the difference between the target load and the cutable load of the first aluminum plant is greater than 0, and the difference is greater than the cutable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the cutable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the cutable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is the value obtained by deducting the load shedding amount of the first aluminum plant and the load shedding amount of the second aluminum plant from the target load.

[0065] Specifically, in the process of graded load shedding, the embodiment of the present application preferentially shears off the shearable load of the first aluminum plant A; optionally, when the difference between the target load and the shearable load of the first aluminum plant is less than or equal to 0, the load shedding amount of the first aluminum plant is equal to the target load, and the load shedding amount of the second aluminum plant and the load shedding amount of the public station are both 0. When the shearable load of the first aluminum plant A is insufficient, all the loads of the first aluminum plant A are sheared off. After that, the shortfall will be borne by the load of the second aluminum plant B and the public station load.

[0066] Optionally, in In the case of , that is, when the difference between the target load and the shelving load of the first aluminum plant is greater than 0, and the difference is less than the shelving load corresponding to the first number of rectifier transformers of the second aluminum plant In the case of , the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first quantity is the minimum number of rectifier transformers that can be shelved by the second aluminum plant.

[0067] Optionally, in In the case of, that is, when the difference between the target load and the shelving load of the first aluminum plant is greater than 0, and the difference is equal to the shelving load corresponding to the first number of rectifier transformers of the second aluminum plant In the case of , cutting off electrolytic aluminum The load shedding capacity of the second aluminum plant is equal to the load shedding capacity corresponding to the first number of rectifier transformers. , the load shedding amount of the public station is equal to 0.

[0068] Optionally, in In the case of, that is, when the difference between the target load and the shelving load of the first aluminum plant is greater than 0, and the difference is greater than the shelving load corresponding to the first number of rectifier transformers of the second aluminum plant And the difference is less than the load that can be cut corresponding to the second number of rectifier transformers of the second aluminum plant In the case of , the load shedding amount of the second aluminum plant is equal to the load shedding amount corresponding to the first number of rectifier transformers The load shedding amount of the public station is the value obtained by subtracting the load shedding amount of the first aluminum plant and the load shedding amount of the second aluminum plant from the target load. ; Among them, the second quantity is the maximum number of rectifier transformers that can be cut by the second aluminum plant.

[0069] Optionally, in In the case of cutting off the electrolytic aluminum That is, when the difference between the target load and the load that can be cut in the first aluminum plant is greater than 0, and the difference is equal to the load that can be cut corresponding to the second number of rectifier transformers in the second aluminum plant In the case of , the load shedding amount of the second aluminum plant is equal to the load shedding amount corresponding to the second number of rectifier transformers , the load shedding amount of the public station is equal to 0.

[0070] Optionally, in In the case where the difference between the target load and the shelving load of the first aluminum plant is greater than 0, and the difference is greater than the shelving load corresponding to the second number of rectifier transformers of the second aluminum plant , the load removal of the First Aluminum Plant is equal to the load that can be cut by the First Aluminum Plant , the load shedding amount of the second aluminum plant is equal to the load shedding amount corresponding to the second number of rectifier transformers The load shedding amount of the public station is the value obtained by subtracting the load shedding amount of the first aluminum plant and the load shedding amount of the second aluminum plant from the target load. If the system voltage is too high after the above loads are removed, the capacitor bank supporting the aluminum plant will be disconnected.

[0071] The method of the above embodiment, combined with the load flow transfer characteristics of electrolytic aluminum, realizes accurate load shedding in stages, and improves the refinement level of the stabilization control system while ensuring the safety and stability of the power grid.

[0072] In one embodiment, the first quantity and the second quantity are determined based on the first constraint condition and the second constraint condition; wherein the first constraint condition is the constraint condition of the electrolytic cell insulation current corresponding to when the load of the second aluminum plant is cut off; the second constraint condition is the constraint condition of the rectifier transformer initial current corresponding to when the load of the second aluminum plant is cut off.

[0073] Specifically, when a busbar fault or a double-circuit line N-2 fault occurs, the stability control system issues a load shedding command and simultaneously issues a conversion command to the aluminum plant that can perform control mode conversion. The corresponding aluminum plant changes from large closed-loop control to small closed-loop control to avoid load transfer. The aluminum plant that can perform control mode conversion is defined as the first aluminum plant A.

[0074] Optionally, for the aluminum plant that cannot be converted to small closed-loop control, the number of its switchable rectifier transformers is calculated, and this type of aluminum plant is defined as the second aluminum plant B.

[0075] Optionally, after removing m rectifier transformers, the remaining rectifier transformers should be operated to ensure the insulation current of the electrolytic cell.

[0076] (1);

[0077] Among them, n is the number of initial rectifier transformers, m is the number of rectifier transformers to be removed, and k is the current coefficient of a single rectifier transformer, which is between 0 and 1. For the rated current of a single rectifier transformer, is the electrolytic cell insulation current coefficient, is the rated current of the electrolytic cell.

[0078] Optionally, after removing m rectifier transformers, the remaining rectifier transformers should be able to avoid the current shared in the large closed-loop control , so that it does not trip due to overcurrent.

[0079] (2);

[0080] in, Single rectifier initial current.

[0081] Then, by solving equations (1) and (2), we can obtain the number of switchable rectifier transformers m that satisfies:

[0082] ;

[0083] Among them, m can be a positive integer in the above range. , , the load cut is , within the range.

[0084] The method of the above embodiment can accurately determine the minimum and maximum number of switchable rectifier transformers of the second aluminum plant based on the constraint conditions of the electrolytic cell insulation current corresponding to when the load of the second aluminum plant is cut off and the constraint conditions of the rectifier transformer initial current corresponding to when the load of the second aluminum plant is cut off, thereby improving the refinement level of the stabilization control system while ensuring the safety and stability of the power grid.

[0085] Exemplarily, the load shedding method in the embodiment of the present application has the following specific process:

[0086] Step 1. Establish a power grid data model and generate a power flow file based on the operation mode.

[0087] Step 2. When a busbar fault or a double-circuit line N-2 fault occurs, the stability control system issues a load shedding command and simultaneously issues a conversion command to the aluminum plant that can perform control mode conversion. The corresponding aluminum plant changes from large closed-loop control to small closed-loop control to avoid load transfer. The aluminum plant that can perform control mode conversion is defined as aluminum plant A.

[0088] Step 3. For the aluminum plant that cannot be converted to small closed-loop control, calculate the number of rectifier transformers that can be switched. This type of aluminum plant is defined as aluminum plant B.

[0089] 3-1. After removing m rectifier transformers, the remaining rectifier transformers should be operated to ensure the insulation current of the electrolytic cell.

[0090] (1);

[0091] Where: n is the number of initial rectifier transformers, m is the number of rectifier transformers to be removed, k is the current coefficient of a single rectifier transformer, which is between 0 and 1. For the rated current of a single rectifier transformer, is the electrolytic cell insulation current coefficient, is the rated current of the electrolytic cell.

[0092] 3-2. After removing m rectifier transformers, the remaining rectifier transformers should be able to avoid the current shared in the large closed-loop control so that they will not trip due to overcurrent.

[0093] (2);

[0094] Where: Single rectifier initial current.

[0095] 3-3. Solve equations (1) and (2) to obtain the number of switchable rectifier transformers m that satisfies:

[0096] ;

[0097] Among them, m can be a positive integer in the above range. , , the load cut is , within the range.

[0098] Step 4: Stabilize the load shedding distribution of the control system.

[0099] The loads of Aluminum Plant A and Aluminum Plant B and the public station are distributed:

[0100] ;

[0101] Where: The load that needs to be cut in case of a fault. To detect the initial power of the section, The preset threshold value for this fault.

[0102] 4-1. Prioritize the shearable load of Aluminum Plant A. If the shearable load is insufficient, shear all the load of Aluminum Plant A. After that, the shortfall will be borne by the load of aluminum plant B and the public station load.

[0103] 4-2. , cut off the public load according to the actual load shedding value .

[0104] 4-3. , cutting off electrolytic aluminum Rectifier transformer.

[0105] 4-4. , cutting off electrolytic aluminum The insufficient part of the rectifier transformer is cut off from the public load.

[0106] 4-5. , cutting off electrolytic aluminum Rectifier transformer.

[0107] 4-6. , cut off all electrolytic aluminum loads.

[0108] If the system voltage is too high after cutting off part or all of the load, cut off the capacitor bank of the aluminum plant.

[0109] The method of the above embodiment simultaneously takes into account the aluminum plant load that can be accurately cut off, the aluminum plant load with load transfer characteristics and the public load, so that after each load station executes the load shedding strategy, the remaining load capacity can be evenly distributed, thereby reducing the risk of power grid accidents.

[0110] The load shedding device provided by the present invention is described below. The load shedding device described below and the load shedding method described above can be referred to each other.

[0111] The load shedding device provided in the embodiment of the present application is as follows: Figure 2 As shown, including:

[0112] The acquisition module 710 is used to acquire a target load amount; the target load amount is the load amount that needs to be removed from the power grid;

[0113] The load shedding module 720 is used to determine the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station in turn according to the difference between the target load and the load shedding amount of the first aluminum plant; among them, the first aluminum plant represents an aluminum plant adopting small closed-loop control; the second aluminum plant represents an aluminum plant adopting large closed-loop control.

[0114] Optionally, the acquisition module 710 is specifically configured to determine the target load according to the initial power of the power grid detection section and a preset threshold value of the fault.

[0115] Optionally, the acquisition module 710 is specifically configured to determine the target load according to the following method:

[0116] ;

[0117] in, Indicates the target load; Indicates the initial power of the power grid detection section; Indicates the preset threshold value of the fault.

[0118] Optionally, the shedding module 720 is specifically configured to, when the difference between the target load and the shedding load of the first aluminum plant is less than or equal to 0, the load shedding amount of the first aluminum plant is equal to the target load, and the load shedding amount of the second aluminum plant and the load shedding amount of the public station are both 0;

[0119] When the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is less than the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first number is the minimum number of rectifier transformers that can be sheared by the second aluminum plant;

[0120] When the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the first number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0121] In the case where the difference between the target load and the cuttable load of the first aluminum plant is greater than 0, the difference is greater than the cuttable load corresponding to the first number of rectifier transformers of the second aluminum plant and the difference is less than the cuttable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cuttable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cuttable load corresponding to the first number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load; the second number is the maximum number of rectifier transformers that can be cut by the second aluminum plant;

[0122] When the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is equal to 0;

[0123] When the difference between the target load and the cutable load of the first aluminum plant is greater than 0, and the difference is greater than the cutable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the cutable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the cutable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is the value obtained by deducting the load shedding amount of the first aluminum plant and the load shedding amount of the second aluminum plant from the target load.

[0124] Optionally, the cut-off module 720 is also used to determine the first quantity and the second quantity based on the first constraint condition and the second constraint condition; wherein the first constraint condition is the constraint condition of the electrolytic cell insulation current corresponding to when the load of the second aluminum plant is cut off; the second constraint condition is the constraint condition of the rectifier transformer initial current corresponding to when the load of the second aluminum plant is cut off.

[0125] Optionally, the first constraint condition includes:

[0126] ;

[0127] Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the electrolytic cell insulation current coefficient; Indicates the rated current of the electrolytic cell;

[0128] The second constraint includes:

[0129] ;

[0130] Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the initial current of a single rectifier transformer.

[0131] Figure 3 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 3 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 complete mutual communication through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the load shedding method, which includes: obtaining the target load amount; the target load amount is the load amount that needs to be shelved by the power grid; according to the difference between the target load amount and the shelvable load amount of the first aluminum plant, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in sequence; wherein the first aluminum plant represents an aluminum plant using a small closed-loop control; the second aluminum plant represents an aluminum plant using a large closed-loop control.

[0132] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0133] On the other hand, the present invention also provides a computer program product, which includes a computer program, and the computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the load shedding method provided by the above methods, and the method includes: obtaining a target load; the target load is the load that needs to be shelved by the power grid; according to the difference between the target load and the shelvable load of the first aluminum plant, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in turn; wherein the first aluminum plant represents an aluminum plant that adopts a small closed-loop control; the second aluminum plant represents an aluminum plant that adopts a large closed-loop control.

[0134] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the load shedding method provided by the above-mentioned methods, the method comprising: obtaining a target load; the target load is the load that needs to be shelved by the power grid; according to the difference between the target load and the shelvable load of the first aluminum plant, determining the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station in turn; wherein the first aluminum plant represents an aluminum plant adopting a small closed-loop control; the second aluminum plant represents an aluminum plant adopting a large closed-loop control.

[0135] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0136] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load shedding method, characterized in that: include: Obtain target load; The target load is the load that needs to be removed from the power grid; According to the difference between the target load and the shearable load of the first aluminum plant, the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in sequence; wherein, the first aluminum plant represents an aluminum plant adopting a small closed-loop control; the second aluminum plant represents an aluminum plant adopting a large closed-loop control; the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station are determined in sequence according to the difference between the target load and the shearable load of the first aluminum plant, including: When the difference between the target load and the load shedding amount of the first aluminum plant is less than or equal to 0, the load shedding amount of the first aluminum plant is equal to the target load, and the load shedding amount of the second aluminum plant and the load shedding amount of the public station are both 0; In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is less than the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first number is the minimum number of rectifier transformers that can be sheared by the second aluminum plant; In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is equal to the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shearable load corresponding to the first number of rectifier transformers, and the load shedding amount of the public station is equal to 0; In the case where the difference between the target load and the cuttable load of the first aluminum plant is greater than 0, the difference is greater than the cuttable load corresponding to the first number of rectifier transformers of the second aluminum plant and the difference is less than the cuttable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cuttable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cuttable load corresponding to the first number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load; the second number is the maximum number of rectifier transformers that can be cut by the second aluminum plant; In the case where the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is equal to 0; When the difference between the target load and the cutable load of the first aluminum plant is greater than 0, and the difference is greater than the cutable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cutable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cutable load corresponding to the second number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load.

2. The load shedding method according to claim 1, characterized in that: The step of obtaining the target load comprises: The target load is determined according to the initial power of the power grid detection section and the preset threshold value of the fault.

3. The load shedding method according to claim 2, characterized in that: The step of determining the target load according to the initial power of the power grid detection section and the preset threshold value of the fault includes: The target load is determined as follows: ； in, Indicates the target load; Indicates the initial power of the power grid detection section; Indicates the preset threshold value of the fault.

4. The load shedding method according to claim 1, characterized in that: The method further comprises: The first quantity and the second quantity are determined according to the first constraint condition and the second constraint condition; wherein the first constraint condition is the constraint condition of the electrolytic cell insulation current corresponding to when the load of the second aluminum plant is cut off; and the second constraint condition is the constraint condition of the rectifier transformer initial current corresponding to when the load of the second aluminum plant is cut off.

5. The load shedding method according to claim 4, characterized in that: The first constraint condition includes: ； Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the electrolytic cell insulation current coefficient; Indicates the rated current of the electrolytic cell; The second constraint condition includes: ； Where n represents the number of initial rectifier transformers; m represents the number of rectifier transformers removed; k represents the current coefficient of a single rectifier transformer, which is between 0 and 1; Indicates the rated current of a single rectifier transformer; Indicates the initial current of a single rectifier transformer.

6. A load shedding device, characterized in that: include: An acquisition module, used for acquiring a target load; The target load is the load that needs to be removed from the power grid; A shedding module, for determining the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station in sequence according to the difference between the target load amount and the shedding load amount of the first aluminum plant; wherein the first aluminum plant represents an aluminum plant adopting a small closed-loop control; the second aluminum plant represents an aluminum plant adopting a large closed-loop control; the load shedding amount of the first aluminum plant, the load shedding amount of the second aluminum plant and the load shedding amount of the public station in sequence according to the difference between the target load amount and the shedding load amount of the first aluminum plant, comprises: When the difference between the target load and the load shedding amount of the first aluminum plant is less than or equal to 0, the load shedding amount of the first aluminum plant is equal to the target load, and the load shedding amount of the second aluminum plant and the load shedding amount of the public station are both 0; In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is less than the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the public station is equal to the difference, and the load shedding amount of the second aluminum plant is 0; the first number is the minimum number of rectifier transformers that can be sheared by the second aluminum plant; In the case where the difference between the target load and the shearable load of the first aluminum plant is greater than 0, and the difference is equal to the shearable load corresponding to the first number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shearable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shearable load corresponding to the first number of rectifier transformers, and the load shedding amount of the public station is equal to 0; In the case where the difference between the target load and the cuttable load of the first aluminum plant is greater than 0, the difference is greater than the cuttable load corresponding to the first number of rectifier transformers of the second aluminum plant and the difference is less than the cuttable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cuttable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cuttable load corresponding to the first number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load; the second number is the maximum number of rectifier transformers that can be cut by the second aluminum plant; In the case where the difference between the target load and the shelvable load of the first aluminum plant is greater than 0, and the difference is equal to the shelvable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load shedding amount of the first aluminum plant is equal to the shelvable load of the first aluminum plant, the load shedding amount of the second aluminum plant is equal to the shelvable load corresponding to the second number of rectifier transformers, and the load shedding amount of the public station is equal to 0; When the difference between the target load and the cutable load of the first aluminum plant is greater than 0, and the difference is greater than the cutable load corresponding to the second number of rectifier transformers of the second aluminum plant, the load removal amount of the first aluminum plant is equal to the cutable load of the first aluminum plant, the load removal amount of the second aluminum plant is equal to the cutable load corresponding to the second number of rectifier transformers, and the load removal amount of the public station is the value obtained by deducting the load removal amount of the first aluminum plant and the load removal amount of the second aluminum plant from the target load.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the load shedding method according to any one of claims 1 to 5 is implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the load shedding method according to any one of claims 1 to 5 is implemented.

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