A control method and device for electrolytic manganese load participating in primary frequency modulation of a power grid
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHAN UNIV
- Filing Date
- 2026-03-30
- Publication Date
- 2026-06-19
Smart Images
Figure CN122246757A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power system operation and control technology, specifically to a control method and device for electrolytic manganese loads participating in primary frequency regulation of the power grid. Background Technology
[0002] Currently, primary frequency regulation is mainly undertaken by traditional power plants (such as thermal and hydropower plants). They respond to frequency changes by adjusting the output of their prime movers. However, this method has a slow response speed (limited by mechanical inertia) and limited regulation capacity. As the proportion of fluctuating renewable energy sources such as wind and solar power in the power grid increases, the grid's demand for fast and flexible frequency regulation resources is becoming increasingly urgent.
[0003] Meanwhile, on the electricity consumption side, high-energy-consuming industrial loads such as electrolytic manganese and electrolytic aluminum have enormous power outputs (a single plant can reach tens of megawatts), and their production is continuous and stable. Taking electrolytic manganese as an example, it uses high-power rectifiers to convert alternating current (AC) to direct current (DC) for the electrolysis process. Currently, these loads typically operate at constant power and are considered "rigid" loads on the power grid, with their enormous power regulation potential remaining untapped. If these loads could dynamically adjust their power consumption according to the grid frequency, transforming them from "electricity consumers" into "service providers," it would provide the power grid with a completely new and rapid frequency regulation method.
[0004] While existing technologies have proposed incorporating industrial loads into frequency regulation, they often lack in-depth consideration of the constraints of specific production processes. For electrolytic manganese, there is a technical lower limit to maintaining the electrolytic reaction with a given direct current, and excessively rapid current changes directly affect the deposition quality of metallic manganese on the cathode plate. Ignoring these critical boundary conditions and blindly adjusting power will severely impact production safety and product quality, rendering the technology impractical. Summary of the Invention
[0005] The purpose of this invention is to provide a control method and device for electrolytic manganese loads to participate in the primary frequency regulation of the power grid. This method can fully utilize the rapid power regulation capability of electrolytic manganese loads while strictly ensuring the stability and continuity of its production process, ensuring that the frequency regulation action does not affect the quality of the final product, and achieving a win-win situation for power grid safety and enterprise production.
[0006] To achieve the above objectives, in a first aspect, the present invention provides a control method for electrolytic manganese loads participating in primary frequency regulation of the power grid, comprising: Obtain the actual frequency of the power grid within the current control cycle; The frequency deviation is obtained by calculating the difference between the actual frequency and the standard frequency of the power grid in the current control cycle. When the absolute value of the frequency deviation is greater than the dead zone of the primary frequency regulation, the frequency deviation is converted into the power regulation amount that needs to be adjusted. Convert the power regulation amount into the demand current change amount, and calculate the original current command based on the demand current change amount; The original current command is subjected to safety limiting and economic constraint processing to determine the optimized current for the current control cycle. The optimized current for the current control cycle is then subjected to speed limiting processing to determine the final current command. The actual DC current during the operation of the electrolytic manganese load is tracked by the final current command, enabling the electrolytic manganese load to participate in the primary frequency regulation of the power grid.
[0007] According to the present invention, a control method for electrolytic manganese load participating in primary frequency regulation of the power grid converts frequency deviation into a power regulation quantity that needs to be adjusted, comprising: Based on the preset droop characteristics, the frequency deviation is converted into the power adjustment amount that needs to be adjusted. The droop control equation used is as follows: ; Where ΔP represents the power regulation amount, K represents the droop coefficient, and Δf represents the frequency deviation. According to the control method for electrolytic manganese load participating in primary frequency regulation of the power grid provided by the present invention, the formula for calculating the change in demand current is as follows: ; Where ΔI represents the change in demand current, The average slot voltage, This refers to the number of electrolytic cells; This represents the average rectification efficiency. According to the control method for electrolytic manganese load participating in primary frequency regulation of the power grid provided by the present invention, the calculation formula for the original current command is as follows: ; in. This is the original current command, where I_base is the base current for the current control cycle's electrolytic manganese load operation. According to the control method for electrolytic manganese load participating in primary frequency regulation of the power grid provided by the present invention, the safety limiting processing is as follows: the original current command is used as input, and the intermediate current command is output, expressed as: ; Where I_ref_limited is the intermediate current command, and I_min and I_max are the lower current limit and the upper current limit, respectively. According to the present invention, a control method for electrolytic manganese load participating in primary frequency regulation of the power grid includes the following economic constraint handling: If the intermediate current command I_ref_limited is already within the high-efficiency range [I_opt_low, I_opt_high], then the optimized current for the current control cycle... ; If the intermediate current command I_ref_limited > I_opt_high, then the optimized current I_ref_optimized for the current control period = I_opt_high; If the intermediate current command I_ref_limited < I_opt_low, then the optimized current I_ref_optimized for the current control period = I_opt_low.
[0008] According to a control method for an electrolytic manganese load participating in the primary frequency regulation of the power grid provided by the present invention, speed limit processing is performed on the optimized current for the current control period to determine the final current command, including: Calculate the remaining current change amount ΔI’ = I_ref_optimized - I_prev; If |ΔI’| ≤ ΔI_max, then the final current command I_ref_final = I_ref_optimized; If ΔI’ > ΔI_max, then the final current command I_ref_final = I_prev + ΔI_max; If ΔI’ < -ΔI_max, then the final current command I_ref_final = I_prev - ΔI_max; Where, I_prev represents the current value of the previous control period, and ΔI_max represents the maximum allowable current change amount within the current control period.
[0009] According to a control method for an electrolytic manganese load participating in the primary frequency regulation of the power grid provided by the present invention, the calculation formula for the maximum allowable current change amount within the current control period is: ΔI_max = R_max × ΔT; Where, R_max represents the set maximum current change rate, and ΔT represents the current control period.
[0010] According to a control method for an electrolytic manganese load participating in the primary frequency regulation of the power grid provided by the present invention, obtaining the actual frequency of the power grid within the current control period includes: Read the instantaneous frequency value of the power grid through a programmable logic controller, perform first-order low-pass filtering on the instantaneous frequency value of the power grid, and use the filtered instantaneous frequency value of the power grid as the actual frequency of the power grid within the current control period.
[0011] In a second aspect, the present invention provides a control device for an electrolytic manganese load participating in the primary frequency regulation of the power grid, including: An acquisition unit for acquiring the actual frequency of the power grid within the current control period; The conversion unit is used to calculate the difference between the actual frequency and the standard frequency of the power grid in the current control cycle to obtain the frequency deviation, and when the absolute value of the frequency deviation is greater than the primary frequency regulation dead zone, it converts the frequency deviation into the power regulation amount that needs to be adjusted. The calculation unit is used to convert the power regulation amount into the demand current change amount, and calculate the original current command based on the demand current change amount. The processing unit is used to perform safety limiting and economic constraint processing on the original current command, determine the optimized current for the current control cycle, adjust the speed limit processing on the optimized current for the current control cycle, and determine the final current command. The control unit is used to control the actual DC current of the electrolytic manganese load during operation to track the final current command, so as to enable the electrolytic manganese load to participate in the primary frequency regulation of the power grid.
[0012] Compared with the prior art, the present invention has at least the following technical effects: The present invention provides a control method and apparatus for electrolytic manganese loads participating in primary frequency regulation of the power grid. While fully leveraging the rapid power regulation capability of the electrolytic manganese load, it strictly ensures the stability and continuity of its production process, guaranteeing that frequency regulation does not affect the quality of the final product, thus achieving a win-win situation for both power grid safety and enterprise production. The core concept of this invention lies in using the DC current of the electrolytic manganese load as a direct control variable. Through a "frequency-current" droop control algorithm embedded with strict process constraints, the power grid frequency signal is converted into a safe and feasible current command, thereby achieving rapid and precise regulation of the load power, and ultimately enabling electrolytic manganese loads to participate in primary frequency regulation of the power grid. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0014] In the attached diagram: Figure 1 This is a flowchart of the control method for electrolytic manganese load to participate in the primary frequency regulation of the power grid according to an embodiment of the present invention. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0016] The following detailed description of some embodiments of the present invention will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0017] Please see Figure 1 This invention provides a safe, reliable, and efficient control method for electrolytic manganese loads to participate in primary frequency regulation of the power grid. It utilizes the rapid power regulation capability of large-capacity industrial loads (electrolytic manganese) to control the DC current during its production process, thereby responding to power grid frequency fluctuations in real time and participating in primary frequency regulation. The method includes the following steps: Step S1: Obtain the actual frequency of the power grid within the current control cycle; In some embodiments, the instantaneous power grid frequency value f can be read through the analog input module or communication interface of a PLC (Programmable Logic Controller), enabling continuous and high-precision real-time acquisition of the instantaneous power grid frequency value f. Furthermore, to prevent malfunctions caused by frequency signal jitter, a first-order low-pass filter is applied to the read instantaneous power grid frequency value f. The filter time constant can be set to 0.5 seconds, effectively suppressing noise while ensuring speed. The filtered instantaneous power grid frequency value f is used as the actual power grid frequency f_filtered within the current control cycle.
[0018] Step S2: Calculate the difference between the actual frequency f_filtered of the power grid and the standard frequency (i.e. the rated frequency of the power grid) f0 in the current control cycle to obtain the frequency deviation Δf. When the absolute value of the frequency deviation |Δf| is greater than the primary frequency regulation dead zone DB, convert the frequency deviation Δf into the power regulation amount ΔP that needs to be adjusted. It should be noted that in each control cycle (e.g., 100 milliseconds), the frequency deviation Δf = f_filtered - f0 is calculated. If the absolute value of the frequency deviation |Δf| ≤ DB, it indicates that the power grid experiences normal, minor fluctuations during that control cycle, and no frequency adjustment is required.
[0019] In some embodiments, based on preset droop characteristics, the frequency deviation Δf is converted into a power adjustment amount ΔP that needs to be adjusted, and the droop control equation used is: ; Where K represents the droop coefficient. The negative sign indicates reverse adjustment. When the actual frequency is too low (i.e., Δf is negative), the power consumption needs to be reduced (i.e., ΔP is positive); when the actual frequency is too high (i.e., Δf is positive), the power consumption needs to be increased (i.e., ΔP is negative).
[0020] Step S3: Convert the power regulation ΔP into the demand current change ΔI, which is the total current change corresponding to the grid demand. It reflects the total adjustment required from the current reference point based on the frequency deviation; this is a macro-level demand indicator. The formula for calculating the demand current change ΔI is: ; in, This represents the average tank voltage, such as 4V. This refers to the number of electrolytic cells; The average rectification efficiency is , for example, 0.96; these are constants determined based on design values and historical operating data. For simplification, they can be combined into a single coefficient K_p, i.e. , .
[0021] Calculate the original current command based on the change in demand current. The calculation formula is: ; Wherein, I_base is the base current for the electrolytic manganese load operation in the current control cycle, initially 9.0 kA, which can be dynamically optimized in more advanced control strategies.
[0022] Step S4: Execute the original current command. Perform safety limiting and economic constraint processing to determine the optimal current for the current control cycle. Optimized current for the current control cycle Perform speed limit adjustment processing to determine the final current command I_ref_final; Specifically, step S4 is the core step in ensuring production safety and economy, ensuring that any adjustment commands do not exceed the safe, economical, and feasible operating range of the electrolyzer. This step is divided into the following three consecutive sub-processing stages: S4.1 Safety Limiting Processing (Adjustment Range Constraint): The raw current command I_ref_raw is compared and limited with the upper and lower current limits [I_min, I_max].
[0023] The specific implementation process is as follows: A limiting function block LIMIT is written in the PLC. The input is I_ref_raw, the upper limit is set to I_max, the lower limit is set to I_min, and the output is the limiting intermediate current instruction I_ref_limited.
[0024] The execution code can be as follows: .
[0025] S4.2 Economic operation range optimization (economic optimization): On the premise of safety, preferentially guide the intermediate current command to the efficient range to reduce the operation cost.
[0026] The specific implementation process is as follows: If the intermediate current command I_ref_limited is already within [I_opt_low, I_opt_high], where I_opt_low is the lower limit of the efficient range, equal to 80% of the rated current, = 8 kA; I_opt_high is the upper limit of the efficient range, equal to 95% of the rated current, for example 9.5 kA, then the optimized current for the current control cycle .
[0027] If I_ref_limited > I_opt_high, then I_ref_optimized = I_opt_high. At the same time, a prompt "The adjustment command has reached the upper limit of the economic operation range" can be given on the human-machine interface (HMI).
[0028] If I_ref_limited < I_opt_low, then I_ref_optimized = I_opt_low, and an "inefficient operation alarm" can be generated to remind the operator that the cost-benefit of this adjustment is relatively low.
[0029] S4.3 Rate limit processing (regulation speed constraint): Ensure that the change speed of the current command does not impact the production process.
[0030] The specific implementation process is as follows: Calculate the remaining current change amount ΔI’ = I_ref_optimized - I_prev. Here, the remaining current change amount ΔI’ is the remaining change amount from the current actual operating point to the optimization target, which is the remaining change amount between the current actual operating point and the optimization target after safety limiting and economic optimization processing. I_prev represents the current value of the current in the previous control cycle.
[0031] Calculate the maximum allowable current change amount ΔI_max = R_max × ΔT within the current control cycle ΔT (such as 0.1 s). Here, R_max represents the maximum current change rate, which is set by the process department to prevent the deterioration of manganese deposition. For example, R_max = 100 A / s, ΔT = 0.1 s, then ΔI_max = 100 A / s × 0.1 s = 10 A.
[0032] If |ΔI'|≤ΔI_max, then the final current command I_ref_final=I_ref_optimized.
[0033] If ΔI' > ΔI_max, then I_ref_final = I_prev + ΔI_max (only an increase of 10A is allowed).
[0034] If ΔI' <-ΔI_max, then I_ref_final = I_prev - ΔI_max (only a reduction of 10A is allowed).
[0035] Step S5: Control the actual DC current of the electrolytic manganese load during operation to track the final current command I_ref_final, so that the electrolytic manganese load can participate in the primary frequency regulation of the power grid.
[0036] It should be noted that in actual operation, the final current command can be cyclical, meaning that a safe final current command is passed to the actuator, and the next control cycle begins. The specific process is as follows: 1. The final current command I_ref_final is sent to the control system of the rectifier (such as a rectifier) of the electrolytic manganese load through the communication network.
[0037] 2. The control system adjusts the firing angle of the rectifier thyristor to ensure that the actual DC current during the operation of the electrolytic manganese load accurately tracks the final current command I_ref_final.
[0038] 3. Assign the final current command I_ref_final of the current control cycle to I_prev to prepare for the rate limit calculation of the next control cycle.
[0039] 4. Repeat the above steps to start the frequency control of the next control cycle.
[0040] In the process of controlling the electrolytic manganese load to participate in the primary frequency regulation of the power grid in this invention, the following control processes can also be synchronized.
[0041] Parallel Process 1: Real-time cost assessment, which can quantify the economic cost of each frequency adjustment action.
[0042] 1. Data recording: Before each power adjustment begins, record the initial current I_start and time t_start.
[0043] 2. Cost Calculation: Calculate the following costs after the adjustment period ends or periodically. a. The cost of lost production is:
[0044] Where I_avg is the average current during the calculation period, K_Faraday is the electrochemical equivalent of manganese (kg / A·h), and P_manganese is the unit price of manganese (yuan / kg).
[0045] b. Energy consumption penalty cost:
[0046] Wherein, η_avg is the average operating efficiency, which can be obtained by referring to the I-η (current-efficiency) curve.
[0047] 3. Display and Accumulation: Display the cost of this action and the cumulative cost in real time on the HMI screen.
[0048] Parallel Process Two: System Protection and Status Monitoring. Under which abnormal operating conditions should the load automatically and safely exit primary frequency regulation mode? The system continuously monitors the following "hard" signals. When any condition is triggered, an "emergency stop" logic is immediately executed, blocking the frequency regulation command and forcibly setting the actual DC current of the electrolytic manganese load during operation to I_base: 1. Equipment failure: Rectifier temperature > 85℃, transformer oil temperature > 75℃, cooling water pressure < 0.2MPa.
[0049] 2. Abnormal power quality: Mains voltage |ΔU|>10%U_rated (rated voltage), or frequency |Δf|>0.5Hz.
[0050] 3. Communication interruption: Communication with the frequency measurement unit is lost for more than 5 seconds.
[0051] By repeating the above steps, this invention achieves an automatic, rapid, and absolutely safe response of electrolytic manganese load to the power grid frequency, successfully transforming it into a high-quality resource for primary frequency regulation of the power grid.
[0052] Based on the same inventive concept, another embodiment of the present invention provides a control device for electrolytic manganese load participating in primary frequency regulation of the power grid, used to implement the control method for electrolytic manganese load participating in primary frequency regulation of the power grid as described in the aforementioned embodiment. The device includes: The acquisition unit is used to acquire the actual frequency of the power grid within the current control cycle; The conversion unit is used to calculate the difference between the actual frequency and the standard frequency of the power grid in the current control cycle to obtain the frequency deviation, and when the absolute value of the frequency deviation is greater than the primary frequency regulation dead zone, it converts the frequency deviation into the power regulation amount that needs to be adjusted. The calculation unit is used to convert the power regulation amount into the demand current change amount, and calculate the original current command based on the demand current change amount. The processing unit is used to perform safety limiting and economic constraint processing on the original current command, determine the optimized current for the current control cycle, adjust the speed limit processing on the optimized current for the current control cycle, and determine the final current command. The control unit is used to control the actual DC current of the electrolytic manganese load during operation to track the final current command, so as to enable the electrolytic manganese load to participate in the primary frequency regulation of the power grid.
[0053] The following is a specific embodiment of the present invention.
[0054] In this specific embodiment, the grid rated frequency f0 = 50.0Hz, and the primary frequency regulation dead zone DB = 0.05Hz. The droop coefficient K = 50MW / Hz, set based on the 50MW total load of a certain electrolytic manganese plant, which is willing to provide ±5MW regulation capability. The upper current limit I_max = 10.5kA, which is 105% of the rectifier's rated current; the lower current limit I_min = 3.5kA, which is 35% of the rated current, provided by the process department. The maximum current change rate R_max = 100A / s, set by the process department to prevent manganese deposition deterioration. The lower limit of the high-efficiency range I_opt_low = 8.0kA, and the upper limit of the high-efficiency range I_opt_high = 9.5kA. The reference current I_base = 9.0kA for the current control cycle of electrolytic manganese load operation is set within the high-efficiency range. The droop coefficient K = 50MW / Hz. The coefficient K_p = 5MW / kA, the maximum current change rate R_max = 100A / s, and the current control cycle ΔT = 0.1s.
[0055] In this specific embodiment, the grid frequency drops to 49.90Hz at time t0 due to a sudden drop in wind power.
[0056] The execution process of the control method of the present invention is as follows: S1-S2: The measured f_filtered = 49.90 Hz and Δf = -0.1 Hz are found to be outside the first-order frequency modulation dead zone.
[0057] ΔP = -50 × (-0.1) = +5MW (an additional 5MW of electricity is required).
[0058] S3: ΔI=5 / 5=1kA. I_ref_raw=9.0+1.0=10.0kA.
[0059] S4: 10.0kA within [3.5, 10.5], I_ref_limited = 10.0kA.
[0060] 10.0kA > I_opt_high (9.5kA), therefore I_ref_optimized = 9.5kA. (Economic optimization is in effect) Assuming I_prev = 9.0 kA, then ΔI' = 9.5 - 9.0 = 0.5 kA = 500 A. ΔI_max = 10 A. Therefore, I_ref_final = 9.0 + 0.01 = 9.01 kA. (Rate limiting is in effect) S5: Send 9.01kA to the rectifier. In the next control cycle, I_prev=9.01kA. After S4 again, I_ref_final becomes 9.02kA, and so on, until the optimized current target of 9.5kA is smoothly reached after about 50 seconds.
[0061] Therefore, it can be concluded that under the control strategy of this invention, the electrolytic manganese load ultimately operates at an actual DC current of 9.5kA, which not only responds to the grid demand (providing power support of (9.5-9.0)×5=2.5MW), but also keeps the DC current within the efficient range, and the entire adjustment process is stable with no impact on production. In contrast, without economic range optimization, the load would directly adjust to 10.0kA, resulting in higher energy consumption; without rate limitation, sudden current jumps would affect product quality.
[0062] In summary, this invention provides a safe, reliable, and efficient control method and device for electrolytic manganese loads to participate in primary frequency regulation of the power grid. While fully leveraging the rapid power regulation capabilities of the electrolytic manganese load, it strictly ensures the stability and continuity of its production process, guaranteeing that frequency regulation does not affect the final product quality, thus achieving a win-win situation for both power grid safety and enterprise production. The core concept of this invention lies in using the DC current of the electrolytic manganese load as a direct control variable. Through a "frequency-current" droop control algorithm embedded with strict process constraints, the power grid frequency signal is converted into a safe and feasible current command, thereby achieving rapid and precise regulation of the load power, and ultimately enabling electrolytic manganese loads to participate in primary frequency regulation of the power grid.
[0063] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A control method for electrolytic manganese load participating in primary frequency regulation of the power grid, characterized in that, Including: Obtaining the actual frequency of the power grid within the current control period; Calculating the difference between the actual frequency of the power grid and the standard frequency within the current control period to obtain the frequency deviation, and when the absolute value of the frequency deviation is greater than the dead zone of primary frequency modulation, converting the frequency deviation into a power adjustment amount that needs to be adjusted; Converting the power adjustment amount into a demand current change amount, and calculating the original current command according to the demand current change amount; Performing safety limit processing and economic constraint processing on the original current command, determining the optimized current of the current control period, and performing adjustment speed limit processing on the optimized current of the current control period to determine the final current command; Controlling the actual DC current during the operation of the electrolytic manganese load to track the final current command, so as to enable the electrolytic manganese load to participate in the primary frequency modulation of the power grid.
2. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 1, characterized in that, The conversion of the frequency deviation into a power adjustment amount that needs to be adjusted includes: Converting the frequency deviation into a power adjustment amount that needs to be adjusted according to the preset droop characteristic, and the used droop control equation is: ； where, ΔP represents the power adjustment amount, K represents the droop coefficient, and Δf represents the frequency deviation.
3. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 2, characterized in that, The calculation formula of the demand current change amount is: ； Where ΔI represents the change in demand current, The average slot voltage, This refers to the number of electrolytic cells; This represents the average rectification efficiency.
4. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 3, characterized in that, The calculation formula of the original current command is: ； in. This is the original current command, where I_base is the base current for the current control cycle's electrolytic manganese load operation.
5. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 4, characterized in that, The safety limit processing is: using the original current command as the input and outputting the intermediate current command, and the expression is: ； where, I_ref_limited is the intermediate current command, and I_min and I_max are the current lower limit and current upper limit respectively.
6. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 5, characterized in that, The economic constraint processing includes: If the intermediate current command I_ref_limited is already within the high-efficiency range [I_opt_low, I_opt_high], then the optimized current for the current control cycle... ; If the intermediate current command I_ref_limited > I_opt_high, then the optimized current I_ref_optimized of the current control period = I_opt_high; If the intermediate current command I_ref_limited < I_opt_low, then the optimized current I_ref_optimized of the current control period = I_opt_low.
7. The control method for electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 6, characterized in that, Performing adjustment speed limit processing on the optimized current of the current control period to determine the final current command, including: Calculating the remaining current change amount ΔI’ = I_ref_optimized - I_prev; If |ΔI’| ≤ ΔI_max, then the final current command I_ref_final = I_ref_optimized; If ΔI’ > ΔI_max, then the final current command I_ref_final = I_prev + ΔI_max; If ΔI’ < -ΔI_max, then the final current command I_ref_final = I_prev - ΔI_max; where, I_prev represents the current value of the previous control period, and ΔI_max represents the maximum allowable current change amount within the current control period.
8. The control method for controlling electrolytic manganese load participation in primary frequency regulation of the power grid according to claim 7, characterized in that, The calculation formula of the maximum allowable current change amount within the current control period is: ΔI_max = R_max × ΔT; where, R_max represents the set maximum current change rate, and ΔT represents the current control period.
9. The control method for controlling electrolytic manganese load participating in primary frequency regulation of the power grid according to claim 1, characterized in that, Obtaining the actual frequency of the power grid within the current control period includes: The instantaneous frequency value of the power grid is read by a programmable logic controller, and a first-order low-pass filter is applied to the instantaneous frequency value of the power grid. The filtered instantaneous frequency value of the power grid is then used as the actual frequency of the power grid in the current control cycle.
10. A control device for electrolytic manganese load participating in primary frequency regulation of the power grid, characterized in that, include: The acquisition unit is used to acquire the actual frequency of the power grid within the current control cycle; The conversion unit is used to calculate the difference between the actual frequency and the standard frequency of the power grid in the current control cycle to obtain the frequency deviation, and when the absolute value of the frequency deviation is greater than the primary frequency regulation dead zone, it converts the frequency deviation into the power regulation amount that needs to be adjusted. The calculation unit is used to convert the power regulation amount into the demand current change amount, and calculate the original current command based on the demand current change amount; The processing unit is used to perform safety limiting and economic constraint processing on the original current command, determine the optimized current for the current control cycle, perform speed adjustment limiting processing on the optimized current for the current control cycle, and determine the final current command. The control unit is used to control the actual DC current of the electrolytic manganese load during operation to track the final current command, so as to enable the electrolytic manganese load to participate in the primary frequency regulation of the power grid.