A power grid auxiliary frequency modulation method and system and storage medium

Abstract

The application provides a power grid auxiliary frequency modulation method and system and a storage medium, comprising the following steps: establishing a load model based on a preset current stabilizing system of a high-load electrolytic aluminum load, and determining a load power variation characteristic curve; describing the load power variation characteristic curve of the electrolytic aluminum through a first-order inertia link, fitting through a least square method, and generating a curve parameter; determining a reference current setting range of the current stabilizing system of the electrolytic aluminum load through a preset saturation reactor working voltage critical value, and calculating an electrolytic aluminum load power variation range; generating a load controller through each link parameter of the electrolytic aluminum load; and the load controller controls the electrolytic aluminum load to respond to system frequency disturbance. The application solves the problem of inaccurate and poor effect of the existing electrolytic aluminum auxiliary power grid frequency modulation.

Description

Technical Field

[0001] This invention relates to the field of power grid regulation technology, and in particular to a power grid auxiliary frequency regulation method, system and storage medium. Background Technology

[0002] With the rapid construction of new power systems dominated by new energy generation, the power grid structure is undergoing significant changes. The proportion of traditional generating units such as hydropower and thermal power is decreasing, making it difficult to meet the frequency regulation needs of the power grid, and posing a significant challenge to system frequency security. Some loads in the power grid possess active controllability. If their controllability and power characteristics can be determined, they can be used as an auxiliary means to participate in grid frequency regulation in a timely manner after the grid is disturbed, playing a crucial role in the frequency security of the future new power system. High-energy-consuming industrial loads have significant controllability potential due to their large installed capacity. Moreover, these loads are easy to centrally control, have low retrofit costs, and can achieve load access power regulation simply by adding relevant control links. The electrolytic aluminum industry is enormous; if it can be used to assist in power system frequency regulation, the frequency security issues of the new power system can be effectively improved.

[0003] Previous power control methods for electrolytic aluminum loads have mostly relied on altering the AC bus voltage or adjusting the on-load tap changer. While adjusting the active power of high-energy-consuming electrolytic aluminum loads based on AC bus voltage changes is suitable for isolated industrial power grids with short electrical distances and simple load types, this method can reduce the generator's terminal voltage through the generator excitation control system, thereby lowering the AC bus voltage of the electrolytic aluminum power supply system and altering its active power. However, this method has poor applicability in grid-connected industrial power grids. Power control methods based on on-load tap changer adjustments have long adjustment times. During the primary frequency regulation phase of thermal power units, the auxiliary frequency regulation effect is limited due to the load power ramp-up rate. Furthermore, this method is a coarse adjustment, the voltage regulation is not continuous, and mechanical adjustment causes wear and tear, resulting in low priority usage and making it difficult for grid frequency regulation to meet practical application requirements. Summary of the Invention

[0004] This invention provides a power grid-assisted frequency regulation method, system, and storage medium to solve the problems of inaccurate and ineffective power grid frequency regulation in existing electrolytic aluminum-assisted systems.

[0005] This invention provides a power grid-assisted frequency regulation method, comprising:

[0006] A load model is established based on a pre-set high-energy-consuming electrolytic aluminum load stabilization system to determine the load power change characteristic curve;

[0007] The load power variation characteristic curve of electrolytic aluminum is described by a first-order inertial element, and the curve parameters are generated by fitting using the least squares method.

[0008] By using the preset critical value of the saturated reactor operating voltage, the reference current setting range of the current stabilization system for the electrolytic aluminum load is determined, and the power variation range of the electrolytic aluminum load is calculated.

[0009] A load controller is generated by analyzing the parameters of each stage of the electrolytic aluminum load.

[0010] The load controller controls the electrolytic aluminum load to respond to system frequency disturbances.

[0011] According to a power grid-assisted frequency regulation method provided by the present invention, the current stabilization system based on a preset high-energy-consuming electrolytic aluminum load establishes a load model and determines the load power change characteristic curve, specifically including:

[0012] Obtain the parameters of the electrolytic aluminum current stabilization system, and establish a load model based on the parameters of the electrolytic aluminum current stabilization system;

[0013] The load model is used to change the reference current set in the electrolytic aluminum current stabilization system, which affects the saturation angle of the saturated reactor.

[0014] The characteristic curve of load power change was obtained by simulation based on the saturation angle of the saturated reactor.

[0015] According to the present invention, a power grid-assisted frequency regulation method is provided, wherein the power variation characteristic curve of the electrolytic aluminum load is described by a first-order inertial element, and curve parameters are generated by least squares fitting, specifically including:

[0016] The electrolytic aluminum load exhibits an inertial element during dynamic response. The power characteristics of the electrolytic aluminum load are described by a first-order inertial element, expressed as follows:

[0017]

[0018] In the formula, parameter K ASL With T ASL The curve of load power variation of electrolytic aluminum was obtained by fitting the curve using the least squares method.

[0019] According to a power grid-assisted frequency regulation method provided by the present invention, the step of determining the reference current setting range of the current stabilization system of the electrolytic aluminum load by using a preset critical value of the operating voltage of the saturated reactor, and calculating the power variation range of the electrolytic aluminum load, specifically includes:

[0020] The saturation angle of the saturated reactor in the current stabilization system is changed by altering the critical value of the saturated reactor's operating voltage, thereby changing the reactor's operating voltage.

[0021] After the operating voltage of the reactor changes, the voltage and current of the DC electrolytic cell change, thus determining the reference current setting range of the current stabilization system for the electrolytic aluminum load.

[0022] Calculate the range of change in the active power of the electrolytic aluminum load by varying its power.

[0023] According to a power grid-assisted frequency regulation method provided by the present invention, the generation of a load controller based on parameters of various components of the electrolytic aluminum load specifically includes:

[0024] The load controller consists of four components: dead zone, proportional amplification, DC blocking, and amplitude limiting.

[0025] The dead zone is determined based on the allowable range of system frequency deviation, the parameters of the proportional amplification stage are derived and calculated using formulas, the DC blocking stage is valued based on engineering experience, and the amplitude limiting stage is jointly determined by the allowable power variation range of the current stabilization system parameters and the production process requirements.

[0026] According to a power grid-assisted frequency regulation method provided by the present invention, the load controller controls the electrolytic aluminum load to respond to system frequency disturbances, specifically including:

[0027] Applying power disturbances to the power system causes a change in the system frequency;

[0028] By comparing the frequency change curves of the system before and after adding a controllable high-energy-consuming electrolytic aluminum load, the auxiliary frequency regulation effect of the electrolytic aluminum load is analyzed and summarized.

[0029] The present invention also provides a power grid auxiliary frequency regulation system, the system comprising:

[0030] The load power change characteristic determination module establishes a load model based on a preset high-energy-consuming electrolytic aluminum load stabilization system and determines the load power change characteristic curve.

[0031] The curve parameter generation module is used to describe the load power change characteristic curve of electrolytic aluminum through a first-order inertial element, and generate curve parameters by fitting with the least squares method.

[0032] The load power calculation module is used to determine the reference current setting range of the current stabilization system of the electrolytic aluminum load by using the preset critical value of the saturated reactor operating voltage, and to calculate the range of power variation of the electrolytic aluminum load.

[0033] The load controller generation module is used to generate a load controller based on the parameters of each stage of the electrolytic aluminum load.

[0034] A response module is provided for the load controller to control the electrolytic aluminum load to respond to system frequency disturbances. The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements any of the above-described power grid-assisted frequency regulation methods.

[0035] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the power grid-assisted frequency regulation method as described above.

[0036] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the power grid-assisted frequency regulation method as described above.

[0037] This invention provides a power grid-assisted frequency regulation method, system, and storage medium. By using thyristor control of the excitation current of a saturated reactor, it achieves faster regulation speeds compared to on-load tap-changing transformer-based voltage regulation, with a response speed reaching the millisecond level. This rapid response allows its power regulation to take precedence over the primary frequency regulation of thermal power units, providing excellent auxiliary frequency regulation when dealing with grid frequency fluctuations caused by renewable energy integration. When system frequency disturbances occur, the controllable high-energy-consuming electrolytic aluminum load provides active power support during the primary frequency regulation of thermal power units, reducing the amplitude of system frequency fluctuations, accelerating frequency stabilization, and minimizing the system frequency deviation after the primary frequency regulation is completed. Attached Figure Description

[0038] 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.

[0039] Figure 1 This is one of the flowcharts of a power grid-assisted frequency regulation method provided by the present invention;

[0040] Figure 2 This is the second flowchart of a power grid-assisted frequency regulation method provided by the present invention;

[0041] Figure 3 This is the third flowchart of a power grid-assisted frequency regulation method provided by the present invention;

[0042] Figure 4 This is the fourth flowchart of a power grid-assisted frequency regulation method provided by the present invention;

[0043] Figure 5 This is the fifth flowchart of a power grid-assisted frequency regulation method provided by the present invention;

[0044] Figure 6 This is a schematic diagram of the module connection of a power grid auxiliary frequency regulation system provided by the present invention;

[0045] Figure 7This is a schematic diagram of the structure of the electronic device provided by the present invention;

[0046] Figure 8 This is a schematic diagram of the control model of the saturated reactor in the electrolytic aluminum load stabilization system provided by the present invention;

[0047] Figure 9 This invention provides a fitting curve for describing the characteristics of load power variation in electrolytic aluminum using an inertial element.

[0048] Figure 10 This is a simplified equivalent circuit diagram of the high-energy-carrying electrolytic aluminum load provided by the present invention;

[0049] Figure 11 This is a schematic diagram of a power grid frequency response model containing a load controller provided by the present invention;

[0050] Figure 12 This is a comparison chart of the power system frequency regulation effect before and after adding a control link to a high-energy-consuming electrolytic aluminum load when the frequency of the system provided by this invention drops after being disturbed;

[0051] Figure 13 This is a comparison chart of the power system frequency regulation effect before and after adding a control link to a high-energy-consuming electrolytic aluminum load when the frequency of the system provided by this invention rises after being disturbed.

[0052] Figure label:

[0053] 110: Load power change characteristic determination module; 120: Curve parameter generation module; 130: Load power calculation module; 140: Load controller generation module; 150: Response module;

[0054] 710: Processor; 720: Communication interface; 730: Memory; 740: Communication bus. Detailed Implementation

[0055] 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.

[0056] The following is combined Figures 1-5 A power grid-assisted frequency regulation method according to the present invention includes:

[0057] S100. Based on the preset high-energy-consuming electrolytic aluminum load, a load model is established for the current stabilization system, and the characteristic curve of load power change is determined.

[0058] S200. The load power variation characteristic curve of electrolytic aluminum is described by a first-order inertial element, and the curve parameters are generated by fitting with the least squares method.

[0059] S300. By using the preset critical value of the saturated reactor operating voltage, determine the reference current setting range of the current stabilization system of the electrolytic aluminum load, and calculate the power variation range of the electrolytic aluminum load.

[0060] S400 generates a load controller based on parameters of each stage of the electrolytic aluminum load;

[0061] S500, the load controller controls the electrolytic aluminum load to respond to system frequency disturbances.

[0062] In this invention, the excitation current of the saturated reactor is controlled by a thyristor. Compared with the adjustment method based on the voltage level of the on-load tap-changing transformer, its adjustment speed is faster, with a response speed reaching the level of hundreds of milliseconds. This response speed allows its power regulation to take precedence over the primary frequency regulation of thermal power units, providing excellent auxiliary frequency regulation when dealing with grid frequency fluctuations caused by the integration of new energy sources. Compared with active power regulation methods based on AC bus voltage control, this method has wider applicability. It is suitable not only for isolated industrial power grids with small electrical distances and simple load types, but also for grid-connected industrial power grids, and it will not cause the generator terminal voltage to drop excessively during the adjustment process.

[0063] A load model is established based on a pre-set high-energy-consuming electrolytic aluminum load stabilization system to determine the load power variation characteristic curve, specifically including:

[0064] S101. Obtain the parameters of the electrolytic aluminum current stabilization system, and establish a load model based on the parameters of the electrolytic aluminum current stabilization system;

[0065] S102. Based on the load model, the reference current set by the electrolytic aluminum current stabilization system affects the saturation angle of the saturated reactor;

[0066] S103. The characteristic curve of load power change is obtained by simulation based on the saturation angle of the saturated reactor.

[0067] refer to Figure 8 In this invention, a reference current is given, and the measured value of the output DC electrolytic cell current is compared with the reference value to obtain a deviation signal. This deviation signal is then processed by a PID control circuit to obtain a control current. The control current is the current of the control winding of the saturated reactor. When this control current changes, the initial magnetic flux density of the iron core changes, which in turn delays the commutation of the rectifier circuit. This alters the firing angle of the single-phase semi-controlled rectifier bridge in the saturated reactor control circuit, thereby changing the equivalent AC reactance of the saturated reactor, affecting the low-voltage side voltage and the current of the DC electrolytic cell, and changing the power of the electrolytic aluminum load.

[0068] By applying a step signal to a set reference current value at a certain moment, the reference current value and the saturation angle of the saturated reactor are changed, and the load power changes, thus obtaining the power change characteristic curve.

[0069] refer to Figure 9 The power variation characteristic curve of the electrolytic aluminum load is described by a first-order inertial element. Curve parameters are generated by least-squares fitting, specifically including:

[0070] The electrolytic aluminum load exhibits an inertial element during dynamic response. The power characteristics of the electrolytic aluminum load are described by a first-order inertial element, expressed as follows:

[0071]

[0072] In the formula, parameter K ASL With T ASL The curve of load power variation of electrolytic aluminum was obtained by fitting the curve using the least squares method.

[0073] By using a preset critical value for the operating voltage of the saturated reactor, the reference current setting range of the current stabilization system for the electrolytic aluminum load is determined, and the power variation range of the electrolytic aluminum load is calculated, specifically including:

[0074] S301. Change the saturation angle of the saturated reactor in the current stabilization system and change the operating voltage of the reactor based on the critical value of the saturated reactor's operating voltage.

[0075] S302. After the working voltage of the reactor changes, the voltage and current of the DC electrolytic cell change, and the reference current setting range of the current stabilization system of the electrolytic aluminum load is determined.

[0076] S303. Change the active power of the electrolytic aluminum load and calculate the range of change in the electrolytic aluminum load power.

[0077] refer to Figure 10 In this invention, the voltage drop of the saturated reactor is set to U. SR Low-voltage side AC voltage:

[0078]

[0079] The DC electrolytic cell voltage U dc The following equation applies to the AC voltage on the low-voltage side:

[0080] U dc =1.35U3 (3)

[0081] Combining equations (2) and (3), we can obtain the expression for the DC electrolytic cell current:

[0082]

[0083] The equivalent impedance of a saturated reactor has a limited range of variation, and its operating voltage typically operates between 20 and 40V. The range of reference current variation can be calculated based on this data. By adjusting the step signal to change the reference current to a critical value, the maximum power adjustment range of the electrolytic aluminum load can be obtained by reading the image data.

[0084] Meanwhile, the power requirements of the production process on the load are also considered. The active power variation range is about 10%, which will not affect the product quality of electrolytic aluminum and will only have a slight impact on the output. If it exceeds this range, it will be further restricted in the limiting link of the load controller.

[0085] A load controller is generated based on parameters of each stage of the electrolytic aluminum load, specifically including:

[0086] S401, The four components of the load controller include: dead zone, proportional amplification, DC blocking, and amplitude limiting.

[0087] S402. The dead zone is determined based on the allowable range of system frequency deviation. The parameters of the proportional amplification stage are derived and calculated using formulas. The DC blocking stage is valued based on engineering experience. The amplitude limiting stage is jointly determined by the allowable power variation range of the current stabilization system parameters and the production process requirements.

[0088] The calculation of load controller parameters involves the fitting curve parameters of the first-order inertial element (used for the calculation of proportional amplification element parameters), the power variation range parameters of the current stabilization system and production process requirements (used for the setting of the limiting element parameters), and system-related parameters (used for the setting of dead zone element parameters and the calculation of proportional amplification element parameters).

[0089] refer to Figure 11 The load controller designed in this invention includes a dead zone circuit, a proportional amplification circuit, a DC blocking circuit, and a limiting circuit.

[0090] The dead zone circuit mainly locks out the load controller to prevent the controllable load of electrolytic aluminum from responding frequently to small frequency deviations. Its setting parameters are mainly determined based on the allowable range of system frequency deviation.

[0091] The proportional gain stage functions similarly to the primary frequency regulation factor in a thermal power unit, providing steady-state power support for the system. The calculation process for the proportional gain factor is as follows:

[0092] The primary regulation of the thermal power unit and the change in system frequency satisfy the following:

[0093]

[0094] Among them, f N For the rated frequency, f reg R is the steady-state frequency value of the system after one frequency modulation. GΔP is the droop coefficient for thermal power units. Greg For the primary regulating power of thermal power units, P GN This refers to the rated power of the generator set.

[0095] The load adjustment of electrolytic aluminum and the change in system frequency satisfy the following:

[0096]

[0097] Where, Δf ASLLb R is the dead zone range of the load controller. ASL ΔP is the equivalent load derating factor for electrolytic aluminum. ASLreg For the load regulation power of electrolytic aluminum, P ASLN This is the rated power for the electrolytic aluminum load.

[0098] The system disturbance ΔP is determined by the primary regulating power ΔP of the thermal power unit. Greg And the regulating power ΔP of electrolytic aluminum ASLreg If the load is shared, the power regulation amount borne by the electrolytic aluminum load is:

[0099] ΔP ASLreg =ΔP - ΔP Greg (7)

[0100] The equivalent load lag coefficient for electrolytic aluminum is obtained from (5)(6)(7).

[0101]

[0102] The set reference current change ΔI Greg satisfy:

[0103]

[0104] Where K ASL These are the parameters obtained from the least squares fitting curve in step 2.

[0105] The scaling factor is obtained from (6) and (9):

[0106]

[0107] The DC blocking element exhibits high-pass filtering characteristics, providing transient power support only when the system frequency changes drastically, thereby reducing the maximum change in system frequency and preventing the system frequency from dropping too low. The DC blocking element parameter T... D Based on engineering experience, the size is usually taken as 6 to 7 seconds.

[0108] The limiting circuit is used to restrict the power variation range of the electrolytic aluminum load, preventing it from exceeding the allowable power variation range determined by the parameters of the current stabilization system and the requirements of the production process. The parameters are jointly determined by both.

[0109] The load controller controls the electrolytic aluminum load to respond to system frequency disturbances, specifically including:

[0110] S501. Apply power disturbance to the power system to cause a change in the system frequency;

[0111] S502. Compare the frequency change curves of the system before and after adding a controllable high-energy electrolytic aluminum load, and analyze and summarize the auxiliary frequency regulation effect of the electrolytic aluminum load.

[0112] refer to Figure 12 and 13 By applying power disturbances to the power system to change the system frequency, and comparing the frequency change curves of the system before and after adding a controllable high-energy-consuming electrolytic aluminum load, the auxiliary frequency regulation effect of the electrolytic aluminum load is analyzed and summarized.

[0113] Controllable high-energy-consuming electrolytic aluminum loads provide active power support during the primary frequency regulation of thermal power units, reducing the amplitude of system frequency fluctuations, advancing the time for frequency recovery and stabilization, and reducing the deviation of system frequency after the primary frequency regulation is completed.

[0114] This invention provides a grid-assisted frequency regulation method that uses thyristor control of the excitation current of a saturated reactor. Compared to regulation methods based on the voltage levels of on-load tap-changing transformers, this method offers significantly faster regulation speeds, with response times reaching the millisecond level. This rapid response allows for power regulation to take precedence over primary frequency regulation by thermal power units, providing excellent auxiliary frequency regulation when addressing grid frequency fluctuations caused by renewable energy integration. When system frequency disturbances occur, the controllable high-energy-consuming electrolytic aluminum load provides active power support during the primary frequency regulation of thermal power units, reducing the amplitude of system frequency fluctuations, accelerating frequency stabilization, and minimizing system frequency deviation after primary regulation.

[0115] refer to Figure 6 The present invention also discloses a power grid auxiliary frequency regulation system, the system comprising:

[0116] The load power change characteristic determination module 110 establishes a load model based on the preset high-energy-consuming electrolytic aluminum load stabilization system and determines the load power change characteristic curve.

[0117] The curve parameter generation module 120 is used to describe the load power change characteristic curve of electrolytic aluminum through a first-order inertial element, and generate curve parameters by least squares fitting.

[0118] The load power calculation module 130 is used to determine the reference current setting range of the current stabilization system of the electrolytic aluminum load by using the preset critical value of the working voltage of the saturated reactor, and to calculate the range of power variation of the electrolytic aluminum load.

[0119] The load controller generation module 140 is used to generate a load controller based on the parameters of each stage of the electrolytic aluminum load.

[0120] The response module 150 is used by the load controller to control the electrolytic aluminum load to respond to system frequency disturbances.

[0121] The load power change characteristic determination module acquires the parameters of the electrolytic aluminum current stabilization system and establishes a load model based on the electrolytic aluminum current stabilization system parameters.

[0122] The load model is used to change the reference current set in the electrolytic aluminum current stabilization system, which affects the saturation angle of the saturated reactor.

[0123] The characteristic curve of load power change was obtained by simulation based on the saturation angle of the saturated reactor.

[0124] The curve parameter generation module considers the inertial element present in the dynamic response of the electrolytic aluminum load. It uses a first-order inertial element to describe the power characteristics of the electrolytic aluminum load, expressed as follows:

[0125]

[0126] In the formula, parameter K ASL With T ASL The curve of load power variation of electrolytic aluminum was obtained by fitting the curve using the least squares method.

[0127] The load power calculation module changes the saturation angle of the saturated reactor in the current stabilization system and thus changes the reactor's operating voltage based on the critical value of the saturated reactor's operating voltage.

[0128] After the operating voltage of the reactor changes, the voltage and current of the DC electrolytic cell change, thus determining the reference current setting range of the current stabilization system for the electrolytic aluminum load.

[0129] Calculate the range of change in the active power of the electrolytic aluminum load by varying its power.

[0130] The load controller generation module consists of four components: dead zone, proportional amplification, DC blocking, and amplitude limiting.

[0131] The dead zone is determined based on the allowable range of system frequency deviation, the parameters of the proportional amplification stage are derived and calculated using formulas, the DC blocking stage is valued based on engineering experience, and the amplitude limiting stage is jointly determined by the allowable power variation range of the current stabilization system parameters and the production process requirements.

[0132] The response module applies power disturbances to the power system, causing a change in the system frequency;

[0133] By comparing the frequency change curves of the system before and after adding a controllable high-energy-consuming electrolytic aluminum load, the auxiliary frequency regulation effect of the electrolytic aluminum load is analyzed and summarized.

[0134] This invention provides a power grid-assisted frequency regulation system that uses thyristor control of the excitation current of a saturated reactor. Compared to regulation based on the voltage level of an on-load tap-changing transformer, this system offers significantly faster regulation speeds, with response times reaching the millisecond level. This rapid response allows its power regulation to take precedence over the primary frequency regulation of thermal power units, providing excellent auxiliary frequency regulation when dealing with grid frequency fluctuations caused by renewable energy integration. When system frequency disturbances occur, the controllable high-energy-consuming electrolytic aluminum load provides active power support during the primary frequency regulation of thermal power units, reducing the amplitude of system frequency fluctuations, accelerating frequency stabilization, and minimizing the system frequency deviation after the primary frequency regulation is completed.

[0135] Figure 7 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 7 As shown, the electronic device may include: a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other through the communication bus 740. The processor 710 can call logic instructions in the memory 730 to execute a power grid-assisted frequency regulation method, which includes: establishing a load model based on a preset high-energy-consuming electrolytic aluminum load current stabilization system, and determining the load power change characteristic curve;

[0136] The load power variation characteristic curve of electrolytic aluminum is described by a first-order inertial element, and the curve parameters are generated by fitting using the least squares method.

[0137] By using the preset critical value of the saturated reactor operating voltage, the reference current setting range of the current stabilization system for the electrolytic aluminum load is determined, and the power variation range of the electrolytic aluminum load is calculated.

[0138] A load controller is generated by analyzing the parameters of each stage of the electrolytic aluminum load.

[0139] The load controller controls the electrolytic aluminum load to respond to system frequency disturbances.

[0140] Furthermore, the logical instructions in the aforementioned memory 730 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a 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.

[0141] On the other hand, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being able to be stored on a non-transitory computer-readable storage medium, the computer program being executed by a processor, the computer being able to execute a power grid-assisted frequency regulation method provided by the above methods, the method including: establishing a load model based on a preset high-energy-consuming electrolytic aluminum load current stabilization system, and determining the load power change characteristic curve;

[0142] The load power variation characteristic curve of electrolytic aluminum is described by a first-order inertial element, and the curve parameters are generated by fitting using the least squares method.

[0143] By using the preset critical value of the saturated reactor operating voltage, the reference current setting range of the current stabilization system for the electrolytic aluminum load is determined, and the power variation range of the electrolytic aluminum load is calculated.

[0144] A load controller is generated by analyzing the parameters of each stage of the electrolytic aluminum load.

[0145] The load controller controls the electrolytic aluminum load to respond to system frequency disturbances.

[0146] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform a power grid-assisted frequency regulation method provided by the above methods, the method comprising: establishing a load model based on a preset high-energy-consuming electrolytic aluminum load current stabilization system, and determining the load power change characteristic curve;

[0147] The load power variation characteristic curve of electrolytic aluminum is described by a first-order inertial element, and the curve parameters are generated by fitting using the least squares method.

[0148] By using the preset critical value of the saturated reactor operating voltage, the reference current setting range of the current stabilization system for the electrolytic aluminum load is determined, and the power variation range of the electrolytic aluminum load is calculated.

[0149] A load controller is generated by analyzing the parameters of each stage of the electrolytic aluminum load.

[0150] The load controller controls the electrolytic aluminum load to respond to system frequency disturbances.

[0151] The device embodiments described above are merely illustrative. 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 modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0152] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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; and these 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 of grid assisted frequency modulation, characterized in that, The system comprises: a load model is established based on a preset high-load-capacity electrolytic aluminum load stabilizing system, and a load power variation characteristic curve is determined; a first-order inertia link is used to describe the load power variation characteristic curve of the electrolytic aluminum, and curve parameters are generated through least square fitting; a reference current setting range of the electrolytic aluminum load stabilizing system is determined based on a preset saturation reactor operating voltage critical value, and an electrolytic aluminum load power variation range is calculated; a load controller is generated based on parameters of each link of the electrolytic aluminum load; the load controller controls the electrolytic aluminum load to respond to system frequency disturbance; wherein the load model is established based on the preset high-load-capacity electrolytic aluminum load stabilizing system, and the load power variation characteristic curve is determined, specifically comprising: obtaining electrolytic aluminum stabilizing system parameters, and establishing a load model based on the electrolytic aluminum stabilizing system parameters; changing the saturation angle of the saturation reactor based on the load model and the reference current setting of the electrolytic aluminum stabilizing system; obtaining the load power variation characteristic curve based on the saturation angle of the saturation reactor through simulation; specifically, the reference current setting range of the electrolytic aluminum load stabilizing system is determined based on the saturation reactor operating voltage critical value, and the electrolytic aluminum load power variation range is calculated, specifically comprising: changing the saturation angle of the saturation reactor stabilizing system of the saturation reactor based on the saturation reactor operating voltage critical value, and changing the operating voltage of the saturation reactor; after the operating voltage of the saturation reactor is changed, the voltage and current of the direct-current electrolytic cell change, and the reference current setting range of the electrolytic aluminum load stabilizing system is determined; changing the active power of the electrolytic aluminum load, and calculating the electrolytic aluminum load power variation range; specifically, the load controller is generated based on the parameters of each link of the electrolytic aluminum load, specifically comprising: the four links of the load controller include a dead zone link, a proportional amplification link, a direct current isolation link and a limiting amplitude link; the dead zone link is determined according to the system frequency deviation allowable range, the proportional amplification link parameter is calculated by formula derivation, the direct current isolation link is valued according to engineering experience, and the limiting amplitude link is determined by the power variation range allowed by the stabilizing system parameters and the production process requirements; wherein the saturation reactor excitation current is controlled by silicon controlled rectifier.

2. The grid auxiliary frequency modulation method according to claim 1, characterized in that, specifically, the power variation characteristic curve of the electrolytic aluminum load is described by a first-order inertia link, and curve parameters are generated through least square fitting, specifically comprising: the electrolytic aluminum load has an inertia link in dynamic response, and the power characteristic expression of the electrolytic aluminum load is expressed by a first-order inertia link as follows: where the parameters and are obtained by fitting the curve of the power variation of the electrolytic aluminum load by the least square method.

3. The grid auxiliary frequency modulation method according to claim 1, characterized in that, the load controller controls the electrolytic aluminum load to respond to system frequency disturbance, specifically comprising: applying power disturbance to the power system to change the system frequency; comparing the frequency variation curves of the system before and after the controllable high-load-capacity electrolytic aluminum load is added, and analyzing and summarizing the auxiliary frequency modulation effect of the electrolytic aluminum load.

4. A grid auxiliary frequency regulation system characterized in that, The system comprises: a load power variation characteristic determination module, which establishes a load model based on a preset high-load-capacity electrolytic aluminum load stabilizing system, and determines a load power variation characteristic curve. The curve parameter generation module is configured to describe the load power variation characteristic curve of the electrolytic aluminum by a first-order inertia link, and generate the curve parameter by least square fitting. The load power calculation module is configured to determine a reference current setting range of a smoothing system of the electrolytic aluminum load by a preset saturation reactor operating voltage threshold, and calculate a load power variation range of the electrolytic aluminum. The load controller generation module is configured to generate a load controller by parameters of each link of the electrolytic aluminum load. The response module is configured to respond to system frequency disturbance by the load controller controlling the electrolytic aluminum load. The load model is established based on a preset high-load-capacity electrolytic aluminum load smoothing system, and the load power variation characteristic curve is determined, and specifically includes the following steps: Obtain electrolytic aluminum smoothing system parameters, and establish a load model based on the electrolytic aluminum smoothing system parameters. Change the saturation angle of the saturation reactor based on the load model and the reference current setting of the electrolytic aluminum smoothing system; Obtain the load power variation characteristic curve based on the saturation angle of the saturation reactor by simulation; The preset saturation reactor operating voltage threshold is used to determine the reference current setting range of the smoothing system of the electrolytic aluminum load, and the load power variation range of the electrolytic aluminum is calculated, and specifically includes the following steps: Change the saturation angle of the saturation reactor of the smoothing system based on the saturation reactor operating voltage threshold, and change the operating voltage of the saturation reactor; After the operating voltage of the saturation reactor is changed, the voltage and current of the direct-current electrolytic cell change, and the reference current setting range of the smoothing system of the electrolytic aluminum load is determined; Change the active power of the electrolytic aluminum load, and calculate the load power variation range of the electrolytic aluminum; The load controller is generated by parameters of each link of the electrolytic aluminum load, and specifically includes the following steps: The four links of the load controller include a dead zone link, a proportional amplification link, a direct-current isolation link, and a limiting link. The dead zone link is determined according to the system frequency deviation allowable range, the proportional amplification link parameter is calculated by formula derivation, the direct-current isolation link is valued according to engineering experience, and the limiting link is determined by the power variation range allowed by the smoothing system parameters and the production process requirements. The saturation reactor excitation current is controlled by silicon-controlled rectifier.

5. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the power grid auxiliary frequency modulation method of any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the power grid auxiliary frequency modulation method of any one of claims 1 to 3.

7. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the power grid auxiliary frequency modulation method of any one of claims 1 to 3.

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