A method, system, and equipment for modeling electrolytic load in metal smelting.

Abstract

This invention discloses a method, system, and equipment for modeling the electrolytic load in metal smelting. The invention includes: acquiring AC signals from an AC bus; connecting the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model; using the phase-shifting transformer model to step down and phase-shift the initial voltage corresponding to the AC signal, generating a target voltage and inputting it to a rectifier; rectifying the target voltage through the rectifier, outputting a target DC current, and inputting it to a preset electrolytic cell load module to generate a metal smelting electrolytic load model. This invention solves the technical problems of the lack of existing electromagnetic transient simulation models for aluminum electrolysis and the difficulty in model construction. The invention uses the method of connecting the secondary windings of a transformer in series to construct a phase-shifting transformer model, which can construct arbitrary phase-shifting angles.

Description

Technical Field

[0001] This invention relates to the field of electrolysis load technology, and in particular to a method, system and equipment for modeling electrolysis load in metal smelting. Background Technology

[0002] Electrolytic Load in Metal Smelting: Electrolytic smelting of metals using redox reactions is a large-scale industrial method in metal smelting. This method is frequently used in the smelting of aluminum and silicon. These redox reactions require large amounts of low-voltage direct current (DC). For a single electrolytic cell, the DC voltage may typically be only a few volts, but the current can reach hundreds of kiloamperes. Since the electrical energy required for the reaction is DC, the alternating current (AC) must be rectified before being used in the electrolytic cell.

[0003] Taking aluminum electrolysis as an example, the electricity used in aluminum electrolysis is direct current (DC), characterized by low voltage and high current. The voltage of a single electrolytic cell is typically around 1V to 5V, while the current often exceeds 100kA. However, aluminum electrolysis plants connect multiple cells in series, resulting in a total DC input voltage of approximately 1.1kV and a power output exceeding 600MW for the entire production line. Aluminum electrolysis plants need to convert AC to DC using rectifiers. However, existing electromagnetic transient simulation models for aluminum electrolysis are lacking, and model building is difficult. Summary of the Invention

[0004] This invention provides a method, system, and equipment for modeling electrolytic load in metal smelting, which solves the technical problems of lack of existing electromagnetic transient simulation models for electrolytic aluminum and the difficulty in building such models.

[0005] The first aspect of this invention provides a method for modeling electrolytic load in metal smelting, comprising:

[0006] Acquire AC electrical signals from the AC bus;

[0007] A phase-shifting transformer model is constructed by connecting the secondary windings of the transformers corresponding to the preset multiples in series.

[0008] The initial voltage corresponding to the AC signal is stepped down and phase-shifted using the phase-shifting transformer model to generate the target voltage, which is then input into the rectifier.

[0009] The target voltage is rectified by the rectifier, and the target DC current is output and input into the preset electrolytic cell load module to generate a metal smelting electrolytic load model.

[0010] Optionally, it also includes:

[0011] Obtain the power value corresponding to the load module of the electrolytic cell;

[0012] The required number of pulses is determined based on the power value.

[0013] Optionally, the transformer includes a first transformer and a second transformer; the step of connecting the secondary windings of the transformers corresponding to a preset multiple in series to construct a phase-shifting transformer model includes:

[0014] The secondary windings of the first transformer and the second transformer are connected in series to generate a phase-shifting transformer.

[0015] The secondary windings of the phase-shifting transformers with a preset multiple are connected in series to construct a phase-shifting transformer model.

[0016] Optionally, the step of connecting the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer includes:

[0017] The phase shift angle to be constructed is determined based on the number of pulses;

[0018] Connect the forward voltage vector corresponding to the first transformer, the reverse voltage vector corresponding to the second transformer, and the voltage vector corresponding to the phase shift angle to generate an obtuse triangle;

[0019] Calculate the forward voltage vector value corresponding to the first transformer and the reverse voltage vector value corresponding to the second transformer according to the sine theorem;

[0020] Calculate the ratio of the forward voltage vector value to the reverse voltage vector value;

[0021] The turns ratio of the primary winding to the secondary winding of the first transformer and the second transformer are determined according to the ratio value.

[0022] The primary and secondary windings of the first and second transformers are configured according to the stated turns ratio.

[0023] The secondary windings of the first transformer and the second transformer are connected in series to generate a phase-shifting transformer.

[0024] Optionally, the step of stepping down and phase-shifting the initial voltage corresponding to the AC signal using the phase-shifting transformer model to generate the target voltage and inputting it into the rectifier includes:

[0025] The phase-shifting transformer model is used to reduce the initial voltage corresponding to the AC signal to a preset voltage threshold, thereby generating an intermediate voltage.

[0026] The intermediate voltage is phase-shifted according to a preset phase-shift angle to generate the target voltage, which is then input into the rectifier.

[0027] Optionally, the rectifier includes a rectifier transformer and a rectifier bridge; the step of rectifying the target voltage through the rectifier, outputting a target DC current and inputting it into a preset electrolytic cell load module to generate a metal smelting electrolytic load model includes:

[0028] The target voltage is rectified by the rectifier transformer to output an initial DC current, which is then input into the rectifier bridge.

[0029] The initial DC current is rectified by the rectifier bridge to output the target DC current;

[0030] The target DC current is input into a preset electrolytic cell load module to generate a metal smelting electrolytic load model.

[0031] Optionally, the rectifier bridge is a three-phase uncontrolled rectifier bridge or a three-phase semi-controlled rectifier bridge; the step of rectifying the initial DC current through the rectifier bridge to output the target DC current includes:

[0032] Detect the measured value of the DC current corresponding to the initial DC current;

[0033] If the measured value of the DC current is less than the DC current threshold, then calculate the current difference between the measured value of the DC current and the DC current threshold.

[0034] When the rectifier bridge is the three-phase bridge uncontrolled rectifier bridge, the initial adjustment value of the controllable inductor connected in series on the three-phase bridge uncontrolled rectifier bridge is adjusted according to the current difference to generate the target adjustment value.

[0035] Adjust the three-phase bridge uncontrolled rectifier bridge according to the target adjustment value to generate an updated three-phase bridge uncontrolled rectifier bridge;

[0036] The initial DC current is rectified by the updated three-phase uncontrolled rectifier bridge to output the target DC current.

[0037] When the rectifier bridge is a three-phase bridge semi-controlled rectifier bridge, the current difference is input into the proportional-integral circuit and the trigger angle is output.

[0038] The three-phase bridge semi-controlled rectifier bridge is adjusted by triggering the trigger pulse corresponding to the trigger angle, thereby generating an updated three-phase bridge semi-controlled rectifier bridge.

[0039] The initial DC current is rectified by the updated three-phase bridge semi-controlled rectifier bridge to output the target DC current.

[0040] Optionally, it also includes:

[0041] The phase-shifting transformers corresponding to the phase-shifting transformer model are connected to the two rectifiers respectively according to the Yy and Yd connection method;

[0042] The two rectifiers are connected in parallel.

[0043] A second aspect of the present invention provides a metal smelting electrolysis load modeling system, comprising:

[0044] AC signal module, used to acquire AC signals from the AC bus;

[0045] The phase-shifting transformer model module is used to connect the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model.

[0046] The rectifier module is used to step down and phase-shift the initial voltage corresponding to the AC signal through the phase-shifting transformer model, generate the target voltage, and input it into the rectifier.

[0047] The metal smelting electrolysis load model module is used to rectify the target voltage through the rectifier, output the target DC current and input it into the preset electrolytic cell load module to generate a metal smelting electrolysis load model.

[0048] A third aspect of the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the metal smelting electrolysis load modeling method as described in any of the preceding claims.

[0049] As can be seen from the above technical solutions, the present invention has the following advantages:

[0050] This invention acquires AC signals from the AC bus; connects the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model; uses the phase-shifting transformer model to step down and phase-shift the initial voltage corresponding to the AC signal, generating a target voltage which is then input to a rectifier; the rectifier rectifies the target voltage, outputting a target DC current which is then input to a preset electrolytic cell load module, generating a metal smelting electrolytic load model. This solves the technical problems of the lack of existing electromagnetic transient simulation models for aluminum electrolysis and the difficulty in model construction. This invention constructs a phase-shifting transformer model by connecting the secondary windings of the transformer in series, allowing for the construction of arbitrary phase-shifting angles. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0052] Figure 1 This is a flowchart illustrating the steps of a metal smelting electrolysis load modeling method provided in Embodiment 1 of the present invention.

[0053] Figure 2 This is a flowchart illustrating the steps of a metal smelting electrolysis load modeling method provided in Embodiment 2 of the present invention.

[0054] Figure 3 This is a schematic diagram of a method for constructing a phase shift angle by connecting windings in series, as provided in Embodiment 2 of the present invention;

[0055] Figure 4 This is a schematic diagram illustrating the principle of metal smelting electrolysis load modeling provided in Embodiment 2 of the present invention;

[0056] Figure 5 This is a schematic diagram of a three-phase bridge-type uncontrolled rectifier bridge provided in Embodiment 2 of the present invention;

[0057] Figure 6 This is a schematic diagram of a three-phase bridge semi-controlled rectifier bridge provided in Embodiment 2 of the present invention;

[0058] Figure 7 This is a schematic diagram of the control circuit of a three-phase bridge semi-controlled rectifier bridge provided in Embodiment 2 of the present invention;

[0059] Figure 8 This is a structural block diagram of a metal smelting electrolysis load modeling system provided in Embodiment 3 of the present invention. Detailed Implementation

[0060] This invention provides a method, system, and equipment for modeling the electrolytic load in metal smelting, which addresses the technical problems of the lack of existing electromagnetic transient simulation models for electrolytic aluminum and the difficulty in building such models.

[0061] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0062] Please see Figure 1 , Figure 1 The flowchart illustrates the steps of a metal smelting electrolysis load modeling method provided in Embodiment 1 of the present invention.

[0063] This invention provides a method for modeling electrolytic load in metal smelting, comprising the following steps:

[0064] 101. Collect the AC signal from the AC bus.

[0065] In a specific embodiment, AC signals are acquired from the AC bus.

[0066] 102. Connect the secondary windings of the transformers with preset multiples in series to construct a phase-shifting transformer model.

[0067] It should be noted that the preset multiplier is 6. The primary and secondary windings of the transformer are the primary winding and the secondary winding, respectively. The primary winding is the input terminal of the transformer, providing input (voltage and current) from the outside. The secondary winding is the output terminal of the transformer, providing energy (voltage and current) to the outside (load). The phase-shifting transformer model refers to a model that reduces the voltage and shifts the phase of alternating current.

[0068] In a specific embodiment, the corresponding number of pulsations is constructed according to the required phase shift angle. Multiple transformer secondary windings are then connected in series according to the number of pulsations to generate a phase-shifting transformer model. This model allows for voltage reduction and phase shifting of alternating current. Specifically, the preset multiplier determines the required number of transformers based on the actual number of pulsations.

[0069] 103. The initial voltage corresponding to the AC signal is stepped down and phase-shifted using a phase-shifting transformer model to generate the target voltage and input it into the rectifier.

[0070] It should be noted that the initial voltage refers to the voltage before processing, such as the voltage collected from the AC bus, which should be 220kV.

[0071] The target voltage refers to the voltage after step-down and phase shifting.

[0072] A rectifier is a device that converts alternating current (AC) into direct current (DC).

[0073] In a specific embodiment, the initial voltage is first stepped down using a phase-shifting transformer model. When the voltage is reduced to a preset value, the phase is shifted according to the required phase shift angle to generate the target voltage, which is then input into the rectifier.

[0074] 104. The target voltage is rectified by a rectifier, the target DC current is output and input into the preset electrolytic cell load module to generate a metal smelting electrolytic load model.

[0075] It should be noted that the target DC current refers to the DC current required according to the electrolyzer load model.

[0076] The preset electrolytic cell load module uses a voltage source to simulate the back electromotive force of the electrolytic cell, and a voltage source connected in series with a resistor to simulate the chemical reaction of the electrolytic cell.

[0077] In this embodiment of the invention, the target voltage is rectified to match the required DC current by a rectifier, the target DC current is output, and the target DC current is input into a preset electrolytic cell load model to obtain the metal smelting electrolytic load model.

[0078] This invention acquires AC signals from the AC bus; connects the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model; uses the phase-shifting transformer model to step down and phase-shift the initial voltage corresponding to the AC signal, generating a target voltage which is then input to a rectifier; the rectifier rectifies the target voltage, outputting a target DC current which is then input to a preset electrolytic cell load module, generating a metal smelting electrolytic load model. This solves the technical problems of the lack of existing electromagnetic transient simulation models for aluminum electrolysis and the difficulty in model construction. This invention constructs a phase-shifting transformer model by connecting the secondary windings of the transformer in series, allowing for the construction of arbitrary phase-shifting angles.

[0079] Please see Figure 2 , Figure 2 This is a flowchart illustrating the steps of a metal smelting electrolysis load modeling method provided in Embodiment 2 of the present invention.

[0080] This invention provides a method for modeling electrolytic load in metal smelting, comprising the following steps:

[0081] 201. Acquire the AC signal from the AC bus.

[0082] In this embodiment of the invention, the specific implementation process of step 201 is similar to that of step 101, and will not be repeated here.

[0083] 202. Connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer.

[0084] Optionally, step 202 includes the following steps S11-S17:

[0085] S11. Determine the phase shift angle to be constructed based on the pulse count;

[0086] S12. Connect the forward voltage vector corresponding to the first transformer, the reverse voltage vector corresponding to the second transformer, and the voltage vector corresponding to the phase shift angle to generate an obtuse triangle.

[0087] S13. Calculate the forward voltage vector value corresponding to the first transformer and the reverse voltage vector value corresponding to the second transformer according to the law of sinus.

[0088] S14. Calculate the ratio of the forward voltage vector value to the reverse voltage vector value;

[0089] S15. Determine the turns ratio of the primary winding to the secondary winding of the first transformer and the second transformer respectively based on the ratio value;

[0090] S16. Set the primary winding and secondary winding of the first transformer and the second transformer according to the turns ratio;

[0091] S17. Connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer.

[0092] It should be noted that the required number of pulses can be determined based on the power value of the electrolytic cell load module, thus revealing the required phase shift angle and consequently the voltage vector to be constructed. For example... Figure 3 As shown, phase A represents the primary winding of the first transformer, and phase B represents the secondary winding of the first transformer.

[0093] In a specific embodiment, such as Figure 3 As shown in the diagram, the dashed arrow represents the voltage vector to be constructed. Together with the dashed arrow, it forms an obtuse triangle. The other two sides of this triangle represent the A-phase voltage vector and the opposite B-phase voltage vector, with magnitudes a and b, respectively. The magnitude of the voltage vector to be constructed is c, which is a known quantity. The angle corresponding to the A-phase voltage vector in the obtuse triangle is angle A, the angle corresponding to the B-phase voltage vector is angle B, and the obtuse angle corresponding to the voltage vector to be constructed is angle C. Angle C is 120°, angle B is the phase shift angle to be constructed (also a known quantity), and since the sum of the three interior angles of a triangle is 180°, angle A is also a known quantity.

[0094] Therefore, according to the sine theorem (Equation 1), the magnitudes of the phase A voltage vector and the reverse phase B voltage vector can be calculated. The formula for the sine theorem is as follows:

[0095]

[0096] Specifically, the ratio between the A-phase voltage vector and the reverse B-phase voltage vector is calculated. For a transformer, the voltage ratio is the turns ratio. For example, for a transformer with a primary side of 525kV and a secondary side of 220kV, the turns ratio of the primary and secondary sides is 525:220. After calculating the turns ratio, the number of turns in the primary and secondary windings of the first and second transformers can be set, thereby obtaining the number of turns in the secondary windings of the two transformers connected in series. This allows the construction of a phase-shifting transformer with a specified phase-shift angle in the model.

[0097] 203. Connect the secondary windings of the phase-shifting transformers with a preset multiple in series to construct a phase-shifting transformer model.

[0098] It should be noted that the preset multiplier is 6.

[0099] In embodiments of the present invention, such as Figure 4 As shown, each set of phase-shifting transformers consists of two transformers connected in series on their secondary windings. This invention uses six sets of phase-shifting transformers to construct a phase-shifting transformer model.

[0100] 204. The initial voltage corresponding to the AC signal is stepped down and phase-shifted using a phase-shifting transformer model to generate the target voltage and input it into the rectifier.

[0101] Optionally, step 204 includes the following steps S21-S22:

[0102] S21. The initial voltage corresponding to the AC signal is reduced to a preset voltage threshold using a phase-shifting transformer model to generate an intermediate voltage.

[0103] S22. The intermediate voltage is phase-shifted according to the preset phase-shift angle to generate the target voltage and input it into the rectifier.

[0104] It should be noted that the preset voltage threshold is 110kV.

[0105] In a specific embodiment, taking a 72-pulse rectifier circuit as an example, firstly, one cycle of 72 pulses is calculated. The phase shift angle required by the phase-shifting transformer is then 360° / 72 = 5°. The phase-shifting transformer steps down the initial 220kV AC voltage to 110kV and shifts the phase to generate the target voltage. Specifically, the constructed voltage phases are ±2.5°, ±7.5°, and ±12.5° (i.e., a difference of 5° between each two angles, the entire sequence being -12.5°, -7.5°, -2.5°, 2.5°, 7.5°, 12.5°). The variations of each phase-shifting transformer are shown in Table 1 below:

[0106] Advanced Angle (°) Winding 1 voltage Voltage of winding 2 +7.5 10.07694082 1.657905309 +2.5 10.71251012 0.5540406308 +12.5 9.364679915 2.749152326 Lag Angle (°) Winding 1 voltage Voltage of winding 2 -2.5 11.26655075 0.5540406308 -7.5 11.73484613 1.657905309 -12.5 12.11383224 2.749152326

[0107] Table 1. Phase-Shifting Transformer Turns Ratio Setting Table (High Voltage Side Winding Line Voltage 230kV)

[0108] Furthermore, each phase-shifting transformer is followed by two rectifier transformers (one Yy connection and one Yd connection). The primary side rated voltage of the rectifier transformers is 11kV, and the secondary side rated voltage is 1.8kV. Ultimately, the parallel rectifier bridge outputs approximately 1.1kV and 150kA.

[0109] 205. The target voltage is rectified by a rectifier, the target DC current is output and input into the preset electrolytic cell load module to generate a metal smelting electrolytic load model.

[0110] Optionally, the rectifier includes a rectifier transformer and a rectifier bridge; step 205 includes the following steps S31-S33:

[0111] S31. The target voltage is rectified by a rectifier transformer to output an initial DC current and input it into the rectifier bridge;

[0112] S32. The initial DC current is rectified by the rectifier bridge to output the target DC current;

[0113] S33. Input the target DC current into the preset electrolytic cell load module to generate a metal smelting electrolytic load model.

[0114] It should be noted that a rectifier transformer refers to the voltage transformer of a rectifier device.

[0115] The initial DC current refers to the DC current that performs preliminary rectification on the target voltage, but does not reach the DC current threshold required by the electrolytic cell module.

[0116] A rectifier bridge is a device that encapsulates rectifier tubes within a housing.

[0117] In a specific embodiment, the target voltage is initially rectified by a rectifier transformer to output an initial DC current. Then, the initial DC current is further rectified by a rectifier bridge to output the target DC current. This target DC current is then directly supplied to a preset electrolytic cell load module to obtain a metal smelting electrolysis load model.

[0118] Optionally, the rectifier bridge is a three-phase bridge uncontrolled rectifier bridge or a three-phase bridge semi-controlled rectifier bridge; step S32 includes the following steps S321-S328:

[0119] S321. Detect the measured value of DC current corresponding to the initial DC current;

[0120] S322. If the measured value of DC current is less than the DC current threshold, calculate the current difference between the measured value of DC current and the DC current threshold.

[0121] S323. When the rectifier bridge is a three-phase bridge uncontrolled rectifier bridge, adjust the initial adjustment value of the controllable inductor connected in series on the three-phase bridge uncontrolled rectifier bridge according to the current difference to generate the target adjustment value.

[0122] S324. Adjust the three-phase bridge uncontrolled rectifier bridge according to the target adjustment value to generate and update the three-phase bridge uncontrolled rectifier bridge;

[0123] S325. The initial DC current is rectified by updating the three-phase bridge uncontrolled rectifier bridge to output the target DC current;

[0124] S326. When the rectifier bridge is a three-phase bridge semi-controlled rectifier bridge, the current difference is input into the proportional-integral circuit and the trigger angle is output.

[0125] S327. The three-phase bridge semi-controlled rectifier bridge is adjusted by triggering the trigger pulse corresponding to the trigger angle to generate an updated three-phase bridge semi-controlled rectifier bridge.

[0126] S328. The initial DC current is rectified by updating the three-phase bridge semi-controlled rectifier bridge to output the target DC current.

[0127] It should be noted that the measured value of the DC current corresponding to the initial DC current is detected by the current transformer. The DC current threshold is set according to the load size of the electrolytic aluminum or electrolytic silicon plant. For example, a 200MW electrolytic aluminum plant has a power of 200MW, and the corresponding rated current is approximately 200kA. This is a reference value or rated value that can be set when the plant is built.

[0128] Because electrolytic aluminum production requires extremely high power supply reliability, most electrolytic aluminum plants use diode rectification, while a small number use thyristor rectification. In diode rectification, the rectifier bridge is uncontrollable; the output voltage and current are controlled by changing the inductance of the smoothing reactor / bridge arm reactor, which affects the commutation angle. In thyristor rectification, the rectifier bridge is controllable; the output voltage and current are controlled by changing the firing angle. However, a large firing angle results in a low power factor, potentially requiring the addition of reactive power compensation devices.

[0129] In a specific embodiment, regarding diode rectification technology, such as Figure 5 As shown, a three-phase bridge uncontrolled rectifier bridge is used, with a controllable inductor connected in series on the bridge arm. The control method of the control system is PI control. The current transformer detects the measured value of DC current in real time and compares the measured value of DC current with the DC current threshold. When the measured value of DC current is less than the DC current threshold, the measured value of DC current and the DC current threshold are subtracted to obtain the current difference. The size of the controllable inductor is reduced according to the current difference, which updates the initial three-phase bridge uncontrolled rectifier bridge and generates an updated three-phase bridge uncontrolled rectifier bridge. This causes the voltage corresponding to the target DC current output by the updated three-phase bridge uncontrolled rectifier bridge to increase.

[0130] Furthermore, regarding thyristor rectification technology routes, such as Figure 6As shown, a three-phase bridge semi-controlled rectifier bridge is used, paired with a converter valve trigger control circuit. The control system employs PI control. The current transformer continuously monitors the measured DC current value, comparing it to a DC current threshold. When the measured DC current value is less than the threshold, the difference between the measured and threshold values ​​is obtained, resulting in the current difference. Figure 7 As shown, the input is the DC current threshold I. dref The feedback value is the measured value of the DC current I. d The current difference is input into the proportional-integral circuit, and the output is the trigger angle α. After obtaining the trigger angle α, the trigger angle α is converted into 6 sets of trigger pulses with a width of 6.667ms and a spacing of 3.333ms to trigger the thyristor rectifier bridge, that is, to trigger the three-phase bridge semi-controlled rectifier bridge for adjustment, generate and update the three-phase bridge semi-controlled rectifier bridge, so that the voltage corresponding to the output target DC current increases.

[0131] Optionally, this method further includes the following steps S41-S42:

[0132] S41. Obtain the power value corresponding to the electrolytic cell load module;

[0133] S42. Determine the required number of pulses based on the power value.

[0134] In a specific embodiment, the required number of pulses can be determined based on the power value of the electrolytic cell load module, thereby determining the required phase shift angle in degrees to construct that number of pulses.

[0135] Optionally, this method further includes the following steps S51-S52:

[0136] S51. Connect the phase-shifting transformers corresponding to the phase-shifting transformer model to the two rectifiers respectively according to the Yy and Yd connection methods;

[0137] S52. Connect the two rectifiers in parallel.

[0138] It should be noted that the rectifier includes a rectifier transformer and a rectifier bridge; two six-pulse rectifiers are connected in parallel to form a group.

[0139] In a specific embodiment, such as Figure 4 As shown, each phase-shifting transformer is followed by two rectifier transformers (one with a Yy connection and the other with a Yd connection). The two rectifier transformers are then connected to two rectifier bridges, which are connected in parallel.

[0140] This invention acquires AC signals from the AC bus; connects the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model; uses the phase-shifting transformer model to step down and phase-shift the initial voltage corresponding to the AC signal, generating a target voltage which is then input to a rectifier; the rectifier rectifies the target voltage, outputting a target DC current which is then input to a preset electrolytic cell load module, generating a metal smelting electrolytic load model. This solves the technical problems of the lack of existing electromagnetic transient simulation models for aluminum electrolysis and the difficulty in model construction. This invention constructs a phase-shifting transformer model by connecting the secondary windings of the transformer in series, allowing for the construction of arbitrary phase-shifting angles.

[0141] Please see Figure 8 , Figure 8 This is a structural block diagram of a metal smelting electrolysis load modeling system provided in Embodiment 3 of the present invention.

[0142] This invention provides a metal smelting electrolysis load modeling system, including...

[0143] AC signal module 801 is used to acquire AC signals from the AC bus.

[0144] The phase-shifting transformer model module 802 is used to connect the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model.

[0145] The rectifier module 803 is used to step down and phase-shift the initial voltage corresponding to the AC signal through a phase-shifting transformer model, generate the target voltage, and input it into the rectifier.

[0146] The metal smelting electrolysis load model module 804 is used to rectify the target voltage through a rectifier, output the target DC current and input it into the preset electrolytic cell load module to generate a metal smelting electrolysis load model.

[0147] Optionally, the transformer includes a first transformer and a second transformer; the phase-shifting transformer model module 802 includes:

[0148] The phase-shifting transformer submodule is used to connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer.

[0149] The phase-shifting transformer model submodule is used to connect the secondary windings of a phase-shifting transformer with a preset multiple in series to construct a phase-shifting transformer model.

[0150] Optionally, the phase-shifting transformer submodule includes:

[0151] The phase shift angle submodule is used to determine the phase shift angle to be constructed based on the pulse count;

[0152] The obtuse triangle submodule is used to connect the forward voltage vector corresponding to the first transformer, the reverse voltage vector corresponding to the second transformer, and the voltage vector corresponding to the phase shift angle to generate an obtuse triangle.

[0153] The reverse voltage vector value submodule is used to calculate the forward voltage vector value corresponding to the first transformer and the reverse voltage vector value corresponding to the second transformer according to the sine theorem.

[0154] The ratio submodule is used to calculate the ratio of the forward voltage vector value to the reverse voltage vector value.

[0155] The turns ratio submodule is used to determine the turns ratio of the primary winding and the secondary winding of the first transformer and the second transformer, respectively, based on the ratio value.

[0156] The secondary winding submodule is used to set the primary and secondary windings of the first and second transformers respectively according to the turns ratio;

[0157] The transformer series submodule is used to connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer.

[0158] Optionally, the rectifier module 803 includes:

[0159] The intermediate voltage submodule is used to reduce the initial voltage corresponding to the AC signal to a preset voltage threshold using a phase-shifting transformer model, thereby generating an intermediate voltage.

[0160] The rectifier submodule is used to phase-shift the intermediate voltage according to a preset phase-shift angle, generate the target voltage, and input it into the rectifier.

[0161] Optionally, the rectifier includes a rectifier transformer and a rectifier bridge; the metal smelting electrolysis load model module 804 includes:

[0162] The rectifier bridge submodule is used to rectify the target voltage through the rectifier transformer, output the initial DC current and input it to the rectifier bridge;

[0163] The target DC current submodule is used to rectify the initial DC current through the rectifier bridge and output the target DC current;

[0164] The metal smelting electrolysis load model submodule is used to input the target DC current into the preset electrolytic cell load module to generate the metal smelting electrolysis load model.

[0165] Optionally, the rectifier bridge is a three-phase uncontrolled rectifier bridge or a three-phase semi-controlled rectifier bridge; the target DC current submodule includes:

[0166] The DC current measurement value submodule is used to detect the DC current measurement value corresponding to the initial DC current.

[0167] The current difference submodule is used to calculate the current difference between the measured DC current and the DC current threshold if the measured DC current is less than the DC current threshold.

[0168] The target adjustment value submodule is used to adjust the initial adjustment value of the controllable inductor connected in series on the three-phase uncontrolled rectifier bridge according to the current difference when the rectifier bridge is a three-phase uncontrolled rectifier bridge, and generate the target adjustment value.

[0169] Update the three-phase bridge uncontrolled rectifier bridge sub-module to adjust the three-phase bridge uncontrolled rectifier bridge according to the target adjustment value and generate the updated three-phase bridge uncontrolled rectifier bridge;

[0170] The first output target DC current submodule is used to rectify the initial DC current by updating the three-phase bridge uncontrolled rectifier bridge and output the target DC current.

[0171] The trigger angle module is used to input the current difference into the proportional-integral circuit and output the trigger angle when the rectifier bridge is a three-phase bridge semi-controlled rectifier bridge;

[0172] The three-phase bridge semi-controlled rectifier bridge module is updated to trigger the three-phase bridge semi-controlled rectifier bridge for adjustment by triggering the trigger pulse corresponding to the trigger angle, thereby generating an updated three-phase bridge semi-controlled rectifier bridge.

[0173] The second output target DC current submodule is used to rectify the initial DC current by updating the three-phase bridge semi-controlled rectifier bridge and output the target DC current.

[0174] Optionally, this system also includes:

[0175] The power value submodule is used to obtain the power value corresponding to the load module of the electrolytic cell;

[0176] The pulse count submodule is used to determine the required pulse count based on the power value.

[0177] Optionally, this system also includes:

[0178] The connection method submodule is used to connect the phase-shifting transformer corresponding to the phase-shifting transformer model to the two rectifiers according to the Yy and Yd connection methods respectively;

[0179] The parallel submodule is used to connect two rectifiers in parallel.

[0180] Embodiment 4 of the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program; when the computer program is executed by the processor, the processor performs the steps of the metal smelting electrolysis load modeling method as described in any of the above embodiments.

[0181] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0182] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0183] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0184] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0185] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0186] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for modeling electrolytic load in metal smelting, characterized in that, include: Acquire AC electrical signals from the AC bus; A phase-shifting transformer model is constructed by connecting the secondary windings of the transformers corresponding to the preset multiples in series. The initial voltage corresponding to the AC signal is stepped down and phase-shifted using the phase-shifting transformer model to generate the target voltage, which is then input into the rectifier. The target voltage is rectified by the rectifier, the target DC current is output and input into the preset electrolytic cell load module to generate a metal smelting electrolytic load model. The transformer includes a first transformer and a second transformer; The step of connecting the secondary windings of transformers with a preset multiple in series to construct a phase-shifting transformer model includes: The secondary windings of the first transformer and the second transformer are connected in series to generate a phase-shifting transformer. The secondary windings of the phase-shifting transformers with a preset multiple are connected in series to construct a phase-shifting transformer model; The step of connecting the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer includes: The phase shift angle to be constructed is determined based on the number of pulses; Connect the forward voltage vector corresponding to the first transformer, the reverse voltage vector corresponding to the second transformer, and the voltage vector corresponding to the phase shift angle to generate an obtuse triangle; Calculate the forward voltage vector value corresponding to the first transformer and the reverse voltage vector value corresponding to the second transformer according to the sine theorem; Calculate the ratio of the forward voltage vector value to the reverse voltage vector value; The turns ratio of the primary winding to the secondary winding of the first transformer and the second transformer are determined according to the ratio value. The primary and secondary windings of the first and second transformers are configured according to the stated turns ratio. The secondary windings of the first transformer and the second transformer are connected in series to generate a phase-shifting transformer.

2. The method for modeling electrolytic load in metal smelting according to claim 1, characterized in that, Also includes: Obtain the power value corresponding to the load module of the electrolytic cell; The required number of pulses is determined based on the power value.

3. The method for modeling electrolytic load in metal smelting according to claim 1, characterized in that, The step of stepping down and phase-shifting the initial voltage corresponding to the AC signal using the phase-shifting transformer model to generate the target voltage and input it into the rectifier includes: The phase-shifting transformer model is used to reduce the initial voltage corresponding to the AC signal to a preset voltage threshold, thereby generating an intermediate voltage. The intermediate voltage is phase-shifted according to a preset phase-shift angle to generate the target voltage, which is then input into the rectifier.

4. The method for modeling electrolytic load in metal smelting according to claim 1, characterized in that, The rectifier includes a rectifier transformer and a rectifier bridge; the step of rectifying the target voltage through the rectifier, outputting a target DC current and inputting it into a preset electrolytic cell load module to generate a metal smelting electrolytic load model includes: The target voltage is rectified by the rectifier transformer to output an initial DC current, which is then input into the rectifier bridge. The initial DC current is rectified by the rectifier bridge to output the target DC current; The target DC current is input into a preset electrolytic cell load module to generate a metal smelting electrolytic load model.

5. The method for modeling electrolytic load in metal smelting according to claim 4, characterized in that, The rectifier bridge is a three-phase uncontrolled rectifier bridge or a three-phase semi-controlled rectifier bridge; the step of rectifying the initial DC current through the rectifier bridge to output the target DC current includes: Detect the measured value of the DC current corresponding to the initial DC current; If the measured value of the DC current is less than the DC current threshold, then calculate the current difference between the measured value of the DC current and the DC current threshold. When the rectifier bridge is the three-phase bridge uncontrolled rectifier bridge, the initial adjustment value of the controllable inductor connected in series on the three-phase bridge uncontrolled rectifier bridge is adjusted according to the current difference to generate the target adjustment value. Adjust the three-phase bridge uncontrolled rectifier bridge according to the target adjustment value to generate an updated three-phase bridge uncontrolled rectifier bridge; The initial DC current is rectified by the updated three-phase uncontrolled rectifier bridge to output the target DC current. When the rectifier bridge is a three-phase bridge semi-controlled rectifier bridge, the current difference is input into the proportional-integral circuit and the trigger angle is output. The three-phase bridge semi-controlled rectifier bridge is adjusted by triggering the trigger pulse corresponding to the trigger angle, thereby generating an updated three-phase bridge semi-controlled rectifier bridge. The initial DC current is rectified by the updated three-phase bridge semi-controlled rectifier bridge to output the target DC current.

6. The method for modeling electrolytic load in metal smelting according to claim 1, characterized in that, Also includes: The phase-shifting transformers corresponding to the phase-shifting transformer model are connected to the two rectifiers respectively according to the Yy and Yd connection method; The two rectifiers are connected in parallel.

7. A metal smelting electrolysis load modeling system, characterized in that, include: AC signal module, used to acquire AC signals from the AC bus; The phase-shifting transformer model module is used to connect the secondary windings of a transformer with a preset multiple in series to construct a phase-shifting transformer model. The rectifier module is used to step down and phase-shift the initial voltage corresponding to the AC signal through the phase-shifting transformer model, generate the target voltage, and input it into the rectifier. The metal smelting electrolysis load model module is used to rectify the target voltage through the rectifier, output the target DC current and input it into the preset electrolytic cell load module to generate the metal smelting electrolysis load model. The transformer includes a first transformer and a second transformer; The phase-shifting transformer model module includes: The phase-shifting transformer submodule is used to connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer. The phase-shifting transformer model submodule is used to connect the secondary windings of a phase-shifting transformer with a preset multiple in series to construct a phase-shifting transformer model. The phase-shifting transformer submodule includes: The phase shift angle submodule is used to determine the phase shift angle to be constructed based on the pulse count; The obtuse triangle submodule is used to connect the forward voltage vector corresponding to the first transformer, the reverse voltage vector corresponding to the second transformer, and the voltage vector corresponding to the phase shift angle to generate an obtuse triangle. The reverse voltage vector value submodule is used to calculate the forward voltage vector value corresponding to the first transformer and the reverse voltage vector value corresponding to the second transformer according to the sine theorem. The ratio submodule is used to calculate the ratio of the forward voltage vector value to the reverse voltage vector value; The turns ratio submodule is used to determine the turns ratio of the primary winding to the secondary winding of the first transformer and the second transformer respectively based on the ratio value; The secondary winding submodule is used to set the primary winding and secondary winding corresponding to the first transformer and the second transformer respectively according to the turns ratio; The transformer series submodule is used to connect the secondary windings of the first transformer and the second transformer in series to generate a phase-shifting transformer.

8. An electronic device, characterized in that, The system includes a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor causes the processor to perform the steps of the metal smelting electrolysis load modeling method as described in any one of claims 1-6.

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