Electrolytic copper load adjustable capacity evaluation method based on load characteristic modeling

Abstract

The application discloses an electrolytic copper load adjustable capacity evaluation method based on load characteristic modeling, and comprises the following steps: establishing an electrolytic copper load controllable characteristic model according to production process parameters of the electrolytic copper, and acquiring electrical characteristics of the electrolytic copper load; identifying model parameters by adopting a least square method according to actual data of electrolytic copper production, and obtaining electrolytic copper load controllable characteristic model parameters; and acquiring an electrolytic copper load power adjustable capacity range according to the controllable characteristics of the electrolytic copper load and in combination with production safety constraint conditions. The application establishes an electrolytic copper load controllable characteristic model based on a process flow of the electrolytic copper, identifies model parameters in combination with actual production test data, considers production constraint conditions of the electrolytic copper, and determines a maximum power regulation range of the electrolytic copper load. The application can provide a basic condition for electrolytic loads represented by the electrolytic copper to participate in power demand response.

Description

Technical Field

[0001] This invention relates to the field of power system operation and control technology, and in particular to a method for evaluating the adjustable capacity of electrolytic copper load based on load characteristic modeling. Background Technology

[0002] The uncertainty of new energy sources has become an urgent issue affecting the safe and stable operation of the power grid. From the perspectives of economy and feasibility, utilizing demand-side response, a new and flexible resource, to participate in power grid peak shaving and frequency regulation and to absorb new energy sources is of great significance.

[0003] Currently, load resource regulation mainly focuses on small-capacity, dispersed loads such as electric vehicles and temperature-controlled loads, which is not conducive to unified regulation by the power dispatch center. Electrolytic copper loads, however, possess characteristics such as large power capacity, fast adjustment speed, ease of centralized modification, and short-term adjustments that do not affect production safety, exhibiting enormous potential for power regulation. Currently, there are no effective methods for modeling and assessing the adjustable capacity of electrolytic copper loads. How to establish a controllable characteristic model of electrolytic copper loads based on actual production data, and then assess their adjustable capacity based on this model, is a pressing issue that needs to be addressed to enable their participation in grid demand response. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the aforementioned existing problems, the present invention is proposed.

[0006] Therefore, this invention provides a method for evaluating the adjustable capacity of electrolytic copper load based on load characteristic modeling, which solves the current problem of difficulty in modeling and evaluating the adjustable capacity of electrolytic copper load.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A controllable characteristic model of electrolytic copper load was established based on the production process parameters of electrolytic copper to obtain the electrical characteristics of electrolytic copper load.

[0009] Based on actual data from electrolytic copper production, the least squares method was used to identify the model parameters, thereby obtaining the model parameters for the controllable load characteristics of electrolytic copper.

[0010] Based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints, the adjustable capacity range of the electrolytic copper load power is obtained.

[0011] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the electrical characteristics include the electrolytic cell, and the volt-ampere characteristic model of the electrolytic cell is modeled as follows:

[0012] V B =I d R+E (1)

[0013] Among them, V B I is the DC bus voltage of the electrolytic cell. d R is the DC current of the electrolytic cell, R is the equivalent resistance in series with the electrolytic cell, and E is the equivalent potential of the electrolytic cell.

[0014] As a preferred embodiment of the adjustable capacity assessment method for electrolytic copper based on load characteristic modeling described in this invention, the equivalent resistance R and the equivalent potential E of the electrolytic cell connected in series are related to the electrolyte composition, the temperature of the electrolytic cell, and the electrode spacing, and can remain unchanged for any given electrolytic cell.

[0015] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the electrical characteristics further include the load power of the electrolytic copper, expressed as follows:

[0016]

[0017] Among them, P Cu This represents the load power for electrolytic copper.

[0018] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, wherein: the identification of model parameters using the least squares method based on actual data from electrolytic copper production includes, based on the DC voltage V of the electrolytic cell... B With DC current I d From the linear relationship, we can obtain the transformed relationship:

[0019]

[0020] Among them, E and R need to be identified, and V B and I d It is measurable data that can be directly obtained through monitoring.

[0021] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the step of identifying the model parameters using the least squares method based on actual data from electrolytic copper production further includes:

[0022] The DC bus voltage V is changed by adjusting the tap changer of the on-load tap-changing transformer to alter the transformer's turns ratio k. BAnd monitor the corresponding DC current I d ;

[0023] Based on the aforementioned deformation relationship, the equivalent resistance R and back electromotive force E are identified using the least squares method.

[0024] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the adjustable capacity range of the electrolytic copper load power is obtained based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints. The controllable characteristics of the electrolytic copper load include the electrolytic copper DC bus voltage V... B The voltage V of the high-voltage bus connected to the electrolytic copper load Cu-AH The relationship is represented as:

[0025]

[0026] Among them, L SR V is the equivalent value of a saturated reactor. Cu-AH ω is the voltage of the high-voltage bus, and ω is the voltage angular frequency.

[0027] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the controllable characteristics of the electrolytic copper load further include:

[0028] The electrolytic copper load is connected to an on-load tap-changing transformer. The on-load tap-changing transformer has a total of m1 turns ratio values. Changing its turns ratio k... Cu It can achieve m1 level adjustment, expressed as:

[0029]

[0030] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, wherein: the combination of production safety constraints includes,

[0031] Let L be the equivalent value of the saturated reactor when production requirements are met. SR The adjustment range is Then, from equation (4), the strain ratio k can be obtained. Cu-i The voltage drop V of the DC bus of the electrolytic copper under the following conditions B The adjustment range is:

[0032]

[0033]

[0034] As a preferred embodiment of the electrolytic copper load adjustable capacity assessment method based on load characteristic modeling described in this invention, the method for obtaining the adjustable capacity range of the electrolytic copper load power includes, in conjunction with the electrical characteristics, the load power of the electrolytic copper. Therefore, considering production safety constraints, the maximum adjustable power range of the electrolytic copper load is:

[0035]

[0036] Compared with existing technologies, the beneficial effects of this invention are as follows: A controllable load characteristic model for electrolytic copper was established based on the process flow of electrolytic copper load; model parameters were identified using actual production test data; and, considering the production constraints of electrolytic copper, the maximum power regulation range of the electrolytic copper load was determined. This provides a foundation for electrolytic loads, represented by electrolytic copper, to participate in power demand response, and provides a technical basis for the development of flexible load-side adjustment resources and the safe, stable, and economical operation of the power system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0038] Figure 1 This is a flowchart illustrating the adjustable capacity assessment method for electrolytic copper load based on load characteristic modeling according to an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the equivalent circuit model of the copper electrolytic cell in the method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling, as described in an embodiment of the present invention. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0042] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0043] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0044] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Example 1

[0047] Reference Figure 1-2 As an embodiment of the present invention, a method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling is provided, comprising:

[0048] S1: Establish a controllable characteristic model of electrolytic copper load based on the production process parameters of electrolytic copper, and obtain the electrical characteristics of electrolytic copper load;

[0049] Furthermore, the electrical characteristics include the electrolytic cell, and the current-voltage characteristic model of the electrolytic cell is modeled as follows:

[0050] V B =I d R+E (1)

[0051] Among them, V B I is the DC bus voltage of the electrolytic cell.d R is the DC current of the electrolytic cell, R is the equivalent resistance in series with the electrolytic cell, and E is the equivalent potential of the electrolytic cell.

[0052] Furthermore, the equivalent resistance R and the equivalent potential E of the electrolytic cell are related to the electrolyte composition, the temperature of the electrolytic cell, and the electrode spacing, and can remain unchanged for any given electrolytic cell.

[0053] Furthermore, the electrical characteristics also include the load power of electrolytic copper, expressed as follows:

[0054]

[0055] Among them, P Cu This represents the load power for electrolytic copper.

[0056] It should be noted that electrolytic copper loads possess the following basic electrical characteristics: Electrolytic copper is a thermal energy storage load, meaning its production relies on low voltage and high current flowing through an electrolyte. Thermal energy storage loads have a large inertial time constant; a short-term reduction in power supply will not significantly affect the temperature. This property is the main support for electrolytic copper loads to adjust their own power and participate in grid regulation in short periods.

[0057] S2: Based on the actual data of electrolytic copper production, the least squares method is used to identify the model parameters and obtain the model parameters of the controllable load characteristics of electrolytic copper.

[0058] Furthermore, based on actual data from electrolytic copper production, the least squares method was used to identify model parameters, including those based on the DC voltage V of the electrolytic cell. B With DC current I d From the linear relationship, we can obtain the transformed relationship:

[0059] E = V B -I d R (3)

[0060] Among them, E and R need to be identified, and V B and I d It is measurable data that can be directly obtained through monitoring.

[0061] Furthermore, based on actual data from electrolytic copper production, the least squares method is used to identify model parameters, which also includes...

[0062] The DC bus voltage V is changed by adjusting the tap changer of the on-load tap-changing transformer to alter the transformer's turns ratio k. B And monitor the corresponding DC current I d ;

[0063] Based on the deformation relationship, the equivalent resistance R and back electromotive force E are identified by the least squares method.

[0064] It should be noted that the equivalent resistance R and back electromotive force E are crucial for the active power control of the electrolytic copper load. Therefore, the parameters need to be identified by combining on-site testing of the electrolytic cell with the least squares method. At the same time, in order to avoid the influence of the saturated reactor, the current stabilization control of the saturated reactor was removed in the test.

[0065] S3: Reference Figure 2 Based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints, the adjustable capacity range of the electrolytic copper load power is obtained.

[0066] Furthermore, based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints, the adjustable capacity range of the electrolytic copper load power is obtained. The controllable characteristics of the electrolytic copper load include the DC bus voltage V of the electrolytic copper load. B The voltage V of the high-voltage bus connected to the electrolytic copper load Cu-AH The relationship is represented as:

[0067]

[0068] Among them, L SR V is the equivalent value of a saturated reactor. Cu-AH ω is the voltage of the high-voltage bus, and ω is the voltage angular frequency.

[0069] Furthermore, the controllable characteristics of electrolytic copper load also include,

[0070] The electrolytic copper load is connected to an on-load tap-changing transformer. The on-load tap-changing transformer has a total of m1 turns ratio values. Changing its turns ratio k... Cu It can achieve m1 level adjustment, expressed as:

[0071]

[0072] Furthermore, this includes, in conjunction with production safety constraints,

[0073] Let L be the equivalent value of the saturated reactor when production requirements are met. SR The adjustment range is Then, from equation (4), the strain ratio k can be obtained. Cu-i The voltage drop V of the DC bus of the electrolytic copper under the following conditions B The adjustment range is:

[0074]

[0075]

[0076] Furthermore, by obtaining the adjustable capacity range of the electrolytic copper load power, including the load power of the electrolytic copper in combination with its electrical characteristics, the maximum adjustable power range of the electrolytic copper load under the condition of considering production safety constraints can be obtained as follows:

[0077]

[0078] Real-time Example 2

[0079] Based on a load characteristic modeling-based method for evaluating the adjustable capacity of electrolytic copper load, a practical application scenario is provided to verify its beneficial effects.

[0080] Referring to Table 1, the lower part of Table 1 shows the average series voltage and current data of the workshop electrolytic cells (three spans, four series in series) during the experimental period of a copper company's production test.

[0081] Table 1 Series Voltages and Currents of Electrolytic Cells in Production Test

[0082]

[0083] Based on the above method, combined with equation (3), the equivalent resistance R = 9.738 mΩ and the back electromotive force E = 29.4 V can be identified using the least squares method. Therefore, the load power of the electrolytic copper is:

[0084] P Cu =V B I d =V B (V B -29.4)×0.103×10 -3 MW

[0085] Based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints, the adjustable capacity range of the electrolytic copper load power is obtained. The controllable characteristics of the electrolytic copper load include the DC bus voltage V of the electrolytic copper load. B The voltage V of the high-voltage bus connected to the electrolytic copper load Cu-AH The relationship is represented as:

[0086]

[0087] Among them, L SR V is the equivalent value of a saturated reactor. Cu-AH ω is the voltage of the high-voltage bus, and ω is the voltage angular frequency.

[0088] Considering the electrolytic copper load is connected to an on-load tap-changing transformer, the on-load tap-changing transformer has a total of m1 turns ratio values. Changing its turns ratio k... Cu It can achieve m1 level adjustment, expressed as:

[0089]

[0090] Let L be the equivalent value of the saturated reactor when production requirements are met. SR The adjustment range is Then, from equation (4), the strain ratio k can be obtained. Cu-i The voltage drop V of the DC bus of the electrolytic copper under the following conditions B The adjustment range is:

[0091]

[0092]

[0093] To obtain the adjustable capacity range of the electrolytic copper load power, including, in conjunction with electrical characteristics, the load power of the electrolytic copper, the maximum adjustable power range of the electrolytic copper load under production safety constraints can be obtained as follows:

[0094]

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling, characterized in that, A controllable characteristic model of electrolytic copper load was established based on the production process parameters of electrolytic copper to obtain the electrical characteristics of electrolytic copper load. The electrical characteristics include the load power of electrolytic copper, expressed as: （2） in, The load power for electrolytic copper; Based on the aforementioned deformation relationship, the equivalent resistance R and back electromotive force E are identified using the least squares method. Based on actual data from electrolytic copper production, the least squares method was used to identify the model parameters, resulting in the model parameters for the controllable load characteristics of electrolytic copper, including: parameters based on the DC voltage of the electrolytic cell. With DC current From the linear relationship, we can obtain the transformed relationship: （3） in, and To be identified and It is measurable data that can be directly obtained through monitoring; This also includes changing the DC bus voltage by adjusting the tap changer of the on-load tap-changing transformer to alter the transformer's turns ratio k. And monitor the corresponding DC current. ; Based on the controllable characteristics of the electrolytic copper load and combined with production safety constraints, the adjustable capacity range of the electrolytic copper load power is obtained. The controllable characteristics of the electrolytic copper load include the DC bus voltage of the electrolytic copper load. Voltage of the high-voltage bus connected to the electrolytic copper load The relationship is represented as: （4） in, This is the equivalent value of a saturated reactor. ω is the voltage of the high-voltage bus, and ω is the voltage angular frequency.

2. The method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling as described in claim 1, characterized in that, The electrical characteristics include the electrolytic cell, and the volt-ampere characteristic model of the electrolytic cell is modeled as follows: （1） in, This is the DC bus voltage of the electrolytic cell. R is the DC current of the electrolytic cell, R is the equivalent resistance in series with the electrolytic cell, and E is the equivalent potential of the electrolytic cell.

3. The method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling as described in claim 2, characterized in that, The equivalent resistance R and equivalent potential E of the electrolytic cell are related to the electrolyte composition, the temperature of the electrolytic cell, and the electrode spacing, and can remain unchanged for any given electrolytic cell.

4. The method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling as described in claim 3, characterized in that, The controllable characteristics of the electrolytic copper load also include: The electrolytic copper load is connected to an on-load tap-changing transformer. The on-load tap-changing transformer has the following turns ratio values: Level, change its ratio It is achievable Level adjustment, represented as: （5）。 5. The method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling as described in claim 4, characterized in that, in, The combined production safety constraints include: Let the equivalent value of the saturated reactor meet production requirements. The adjustment range is Then, from equation (4), the strain ratio can be obtained. Electrolytic copper DC bus voltage drop The adjustment range is: （6） （7）。 6. The method for evaluating the adjustable capacity of electrolytic copper based on load characteristic modeling as described in claim 5, characterized in that, To obtain the adjustable capacity range of the electrolytic copper load power, including, in conjunction with the aforementioned electrical characteristics, the load power of the electrolytic copper, the maximum adjustable power range of the electrolytic copper load under production safety constraints can be obtained as follows: （8）。

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