Frequency stability quantification control method and device based on action in dead zone of speed regulator

Abstract

The application discloses a frequency stabilization quantification control method and device based on the action in the dead zone of a speed regulator. The method comprises the following steps: obtaining a frequency response curve of a generator after a power grid disturbance, detecting a maximum value of a frequency deviation in the frequency response curve, and performing control operation on the generator when the maximum value is greater than a set three-line defense starting threshold value; determining a control frequency response curve of the generator after control measures are taken; determining a maximum value of a system frequency deviation when no control measures are taken and a time when the maximum value of the system frequency deviation appears according to the frequency response curve; determining a maximum value of a system frequency deviation when the control measures are taken according to the control frequency response curve; and calculating a control measure amount of the generator according to the above parameters by using a control amount calculation formula, wherein the control measure amount is used to prevent the maximum value of the frequency deviation of the generator after the disturbance from exceeding a preset threshold value.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a frequency stability quantization control method and apparatus based on the action within the dead zone of a speed governor. Background Technology

[0002] The large-scale integration of power electronic power sources, represented by wind and solar power, into the grid and the replacement of some synchronous generators have led to a gradual decrease in system inertia and a weakening of frequency regulation capabilities. Furthermore, the introduction of high-voltage, high-capacity DC transmission has disrupted inertia sharing and frequency mutual support between regions, further weakening the system's frequency support and regulation capabilities. In high-proportion renewable energy power systems, disturbance types are complex and diverse, with large power impacts. Frequency stability problems caused by power electronic power source failures are frequent. In addition to traditional synchronous generator tripping, new types of faults have emerged, such as DC blocking and renewable energy disconnection from the grid, seriously threatening system frequency security. Considering all these factors, frequency characteristics under disturbances are gradually deteriorating, frequency deviations are increasing, and the risk of triggering the third line of defense, leading to generator and load shedding, is growing.

[0003] Traditional frequency control measures are mostly based on the third line of defense against maximum frequency deviation, namely, low-frequency load shedding and high-frequency generator shedding. Under power deficit disturbances, when the system frequency minimum point is below a threshold, some load is shedding to reduce system imbalance and restore the system frequency. Under power surplus disturbances, when the frequency maximum point is above a threshold, some generators are shedding to reduce system imbalance and restore the system frequency. Since the third line of defense load shedding will cause power outages for users, in actual system operation, triggering the low-frequency load shedding defense should be avoided to ensure safe and stable system operation. Therefore, to prevent the system frequency from triggering the third line of defense under disturbances, and to minimize the impact of control measures, a frequency stability quantitative control method for generator governor operation within the dead zone is proposed. Based on the predicted frequency deviation value, it is determined whether the activation threshold of the three lines of defense has been reached. If the three lines of defense will be triggered, control measures are taken in the early stages of the disturbance before the governor operates, reducing the impact of high-frequency generator shedding and low-frequency load shedding measures. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a frequency stabilization quantization control method and apparatus based on the action within the dead zone of a speed governor.

[0005] According to one aspect of the present invention, a frequency stability quantization control method based on governor dead-zone action is provided, comprising:

[0006] The frequency response curve of the generator after the power grid disturbance is obtained, the maximum value of the frequency deviation is detected, and if the maximum value is greater than the set three-line defense start threshold, the generator is controlled to determine the control frequency response curve of the generator after the control measures are taken.

[0007] Based on the frequency response curve, determine the maximum system frequency deviation without control measures and the time when the maximum system frequency deviation occurs without control measures;

[0008] Based on the control frequency response curve, determine the maximum system frequency deviation when control measures are taken;

[0009] Using the control quantity calculation formula, the generator control measure quantity is calculated based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation occurs when no control measures are taken, the maximum system frequency deviation when control measures are taken, and the magnitude of the system disturbance. The control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding the preset threshold after the disturbance.

[0010] Optionally, it also includes:

[0011] When the frequency deviation after disturbance reaches a preset threshold, the generator is controlled and the timing of the control action is recorded.

[0012] Optionally, the formula for calculating the control quantity is as follows:

[0013]

[0014] Among them, f m f′ represents the maximum system frequency deviation when no control measures are taken. m t represents the maximum system frequency deviation when control measures are implemented. m t1 represents the time when the system frequency deviation reaches its maximum value without control measures, t1 represents the time when control measures are implemented, ΔP represents the magnitude of the control variable, ΔP0 represents the magnitude of the system disturbance, and T represents the time when the system frequency deviation reaches its maximum value without control measures. J is the inertial time constant of the generator set.

[0015] According to another aspect of the present invention, a frequency stabilization quantization control device based on governor dead-zone operation is provided, comprising:

[0016] The first determination module is used to obtain the frequency response curve of the generator after the power grid disturbance, detect the maximum value of the frequency deviation in the frequency, and perform control operation on the generator when the maximum value is greater than the set three-line defense start threshold, and determine the control frequency response curve of the generator after the control measures are taken.

[0017] The second determining module is used to determine the maximum system frequency deviation when no control measures are taken and the time when the maximum system frequency deviation occurs when no control measures are taken, based on the frequency response curve.

[0018] The third determining module is used to determine the maximum system frequency deviation when control measures are taken, based on the control frequency response curve.

[0019] The calculation module is used to calculate the generator control measure quantity using the control quantity calculation formula, based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation occurs when no control measures are taken, the maximum system frequency deviation when control measures are taken, and the size of the system disturbance. The control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding a preset threshold after the disturbance.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0021] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0022] Therefore, this invention addresses the constraint of the maximum transient frequency deviation after a power system disturbance, calculates the control activation time and required control quantity of control measures before the speed governor has taken action, and can prevent the maximum frequency deviation from exceeding the threshold and triggering the three lines of defense of the power system. At the same time, it reduces the impact of high-frequency tripping and low-frequency load shedding measures, which has important guiding significance for improving the frequency stability of the system. Attached Figure Description

[0023] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0024] Figure 1 This is a flowchart illustrating a frequency stabilization quantization control method based on governor dead zone action provided in an exemplary embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the unbalanced power and frequency response curve of a frequency stabilization quantization control system based on the action within the dead zone of a speed controller, provided by an exemplary embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of an IEEE 9-node wiring diagram provided in an exemplary embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of frequency deviation curves when control measures are taken and not taken, provided by an exemplary embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the generator mechanical power curves with and without control measures provided in an exemplary embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of a frequency stabilization quantization control device based on the action within the dead zone of a speed governor, provided in an exemplary embodiment of the present invention.

[0030] Figure 7 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0031] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0032] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0033] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0034] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0035] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0036] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0037] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0038] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0042] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0043] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0044] Exemplary methods

[0045] Figure 1 This is a flowchart illustrating a frequency stabilization quantization control method based on governor dead-zone operation, provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as… Figure 1 As shown, the frequency stabilization quantization control method 100 based on the action within the governor dead zone includes the following steps:

[0046] Step 101: Obtain the frequency response curve of the generator after the power grid disturbance, detect the maximum value of the frequency deviation in the frequency, and if the maximum value is greater than the set three-line defense start threshold, perform control operation on the generator to determine the control frequency response curve of the generator after the control measures are taken.

[0047] Step 102: Based on the frequency response curve, determine the maximum system frequency deviation when no control measures are taken and the time when the maximum system frequency deviation occurs when no control measures are taken;

[0048] Step 103: Determine the maximum system frequency deviation when control measures are taken based on the control frequency response curve;

[0049] Step 104: Using the control quantity calculation formula, calculate the generator control measure quantity based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation occurs when no control measures are taken, the maximum system frequency deviation when control measures are taken, and the size of the system disturbance. The control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding the preset threshold after the disturbance.

[0050] Optionally, it also includes:

[0051] When the frequency deviation after disturbance reaches a preset threshold, the generator is controlled and the timing of the control action is recorded.

[0052] Optionally, the formula for calculating the control quantity is as follows:

[0053]

[0054] Among them, f m f′ represents the maximum system frequency deviation when no control measures are taken. m t represents the maximum system frequency deviation when control measures are implemented. m t1 represents the time when the system frequency deviation reaches its maximum value without control measures, t1 represents the time when control measures are implemented, ΔP represents the magnitude of the control variable, ΔP0 represents the magnitude of the system disturbance, and T represents the time when the system frequency deviation reaches its maximum value without control measures. J is the inertial time constant of the generator set.

[0055] Specifically, the process includes the following steps:

[0056] A. Predict the frequency response curve after the disturbance and monitor the maximum frequency deviation f. m If the maximum frequency deviation exceeds the activation threshold f of the three lines of defense sh If yes, proceed to step B; otherwise, repeat step A.

[0057] B. Based on the synchronous machine rotor motion equation, the relationship between generator speed and mechanical power and electromagnetic power is obtained;

[0058] C. Assuming that the governor's action causes a linear change in mechanical power, plot the generator's unbalanced power and frequency response curves after the disturbance. By understanding the relationship between kinetic energy change and the work done by unbalanced power, obtain the expression for the control quantity.

[0059] D. Based on the principle of equal acceleration area, the governor start-up time t after the control measures are taken is obtained. d expression;

[0060] E. The governor start-up time t obtained in step D after taking control measures d Substituting the expression into the control expression in step C, calculate the value that ensures the frequency deviation does not exceed the threshold f′. m The size of the control quantity ΔP.

[0061] Step BE is the process of deriving the control measure formula based on the action within the governor's dead zone.

[0062] In step A, the frequency response curve after the disturbance is predicted, and the maximum frequency deviation is monitored. If the maximum frequency deviation exceeds the activation threshold of the three lines of defense, then step B is initiated; otherwise, step A is repeated. This mainly includes:

[0063] (1) Predict the frequency response after the disturbance based on the disturbance power and disturbance type, and obtain the maximum frequency deviation f. m .

[0064] (2) Let the activation threshold of the three lines of defense be f. sh Compare its value with the predicted maximum frequency deviation f. m relation:

[0065] If f m ≥f sh The three lines of defense will be activated, proceeding to step B;

[0066] If f m <f sh The three lines of defense will be activated, and step A will be repeated to continue predicting the frequency response curve.

[0067] In step B, based on the synchronous machine rotor motion equation, the relationship between generator speed and mechanical power and electromagnetic power is obtained, mainly including:

[0068] (1) For a synchronous generator, its rotor motion equation is:

[0069]

[0070] In the formula, δ is the angle between the generator rotor q-axis and the real axis of the synchronous coordinate system, ω is the generator angular velocity, ω0 is the system rated angular velocity, and T J Let be the inertial time constant of the generator set. This is the per-unit value of the generator's mechanical power. ω is the per-unit value of the generator's electromagnetic power. * Generator angular velocity per unit value.

[0071] (2) Integrating both sides of equation (1) over the interval t1 to t2, we obtain the relationship between the rotational speed and the mechanical and electromagnetic power of the generator:

[0072]

[0073] In the formula, This represents the per-unit value of the angular frequency at time t1. This is the per-unit value of the angular frequency at time t2.

[0074] The above formulas all correspond to single-machine systems. For multi-machine systems, the formulas for T are different. J Equivalent to ω:

[0075]

[0076] ω coi =2πf coi (4)

[0077] In the formula, Let ω be the equivalent inertia of the system. coi f coi These are the system's center angular frequency of inertia and center frequency of inertia, respectively.

[0078] In step C, assuming the governor's action causes a linear change in mechanical power, the generator's unbalanced power and frequency response curves after the disturbance are plotted. The control expression is obtained through the relationship between kinetic energy change and the work done by the unbalanced power, mainly including:

[0079] Assuming the governor's operation causes a linear change in mechanical power, the generator's unbalanced power and frequency response curves after the disturbance are plotted as shown in the attached figure. Figure 1 As shown, according to equation (2), the relationship between the maximum frequency deviation and the unbalanced power after taking control measures and without taking control measures is obtained:

[0080]

[0081] In the formula, f m f′ represents the maximum system frequency deviation when no control measures are taken. m f1 represents the maximum system frequency deviation when control measures are taken, and t represents the system frequency deviation when control measures are taken. m t represents the time when the system frequency deviation reaches its maximum value without any control measures being taken. d t′ represents the governor startup time when no control measures are taken. dt1 is the start time of the speed governor when control measures are taken, t1 is the time when control measures are taken, ΔP is the magnitude of the control quantity, and ΔP0 is the magnitude of the system disturbance.

[0082] (2) From equation (5), we can obtain:

[0083]

[0084] The expression for the control quantity is obtained as follows:

[0085]

[0086] In step D, based on the principle of equal acceleration area, the governor start-up time t after taking control measures is obtained. d Expressions, mainly including:

[0087] After control is applied, the time to reach the governor start-up threshold will be reduced from t d Extended to t d During this period, the acceleration area of ​​the generator is the same, that is, attached Figure 1 The shaded areas are equal in size:

[0088] ΔP(t d -t1)=(P0-ΔP)(t′ d -t d (8)

[0089] Solve for the governor start-up time t′ after taking control measures. d The expression is:

[0090]

[0091] In step E, the governor start-up time t′ after taking control measures, obtained in step D, is used. d Substituting the expression into the control expression in step C, calculate the value that ensures the frequency deviation does not exceed the threshold f′. m The magnitude of the control variable ΔP mainly includes:

[0092] Substituting equation (9) into equation (7), we get:

[0093]

[0094] We obtain a quadratic equation for ΔP:

[0095] ΔP 2 (t m -t1)-ΔP[P0t m -P0t1+T J (f m 2 -f m ′2 )]+P0TJ (f m 2 -f m ′2 )=0 (11)

[0096] The solution is to ensure that the frequency deviation does not exceed the threshold f′. m The magnitude of the control quantity ΔP is:

[0097]

[0098] This paper proposes a frequency stability quantification control method for governor operation within the dead zone. The method includes monitoring the maximum frequency deviation based on the frequency response curve after disturbance; if the maximum frequency deviation exceeds the activation threshold of the three defense lines, control measures are initiated. Based on the synchronous machine rotor motion equation, the relationship between generator speed and mechanical and electromagnetic power is obtained. Assuming that governor operation causes a linear change in mechanical power, the generator unbalanced power and frequency response curves after disturbance are plotted. The control expression is obtained through the relationship between kinetic energy change and the work done by unbalanced power. Based on the principle of equal acceleration area, the governor activation time t′ after taking control measures is obtained. d The expression; will be the governor start-up time t′ after control measures are taken. d Substituting the expression into the control expression, calculate the value that ensures the frequency deviation does not exceed the threshold f′. m The size of the control quantity ΔP.

[0099] Furthermore, the specific implementation of this application is as follows: Figures 3 to 5 As shown, the attached Figure 3 This is the wiring diagram for an IEEE 9-node connector. Figure 4 To set the disturbance to a power surplus of 55MW, with a maximum frequency deviation control target of 0.75Hz, the system frequency curves at t=0.144s are compared between the implementation of a 14.3MW power cut-off control measure and the absence of such a measure. Figure 5 To set the disturbance to a power surplus of 55MW, with a maximum frequency deviation control target of 0.75Hz, the generator mechanical power curves at t=0.144s are compared between the control measures of 14.3MW generator tripping and those without.

[0100] Therefore, this invention addresses the constraint of the maximum transient frequency deviation after a power system disturbance, calculates the control activation time and required control quantity of control measures before the speed governor has taken action, and can prevent the maximum frequency deviation from exceeding the threshold and triggering the three lines of defense of the power system. At the same time, it reduces the impact of high-frequency tripping and low-frequency load shedding measures, which has important guiding significance for improving the frequency stability of the system.

[0101] Exemplary device

[0102] Figure 6This is a schematic diagram of the structure of a frequency stabilization quantization control device based on the action within the dead zone of a speed governor, provided in an exemplary embodiment of the present invention. Figure 6 As shown, the device 600 includes:

[0103] The first determining module 610 is used to obtain the frequency response curve of the generator after the power grid disturbance, detect the maximum value of the frequency deviation in the frequency, and perform control operation on the generator when the maximum value is greater than the set three-line defense start threshold, and determine the control frequency response curve of the generator after the control measures are taken.

[0104] The second determining module 620 is used to determine the maximum value of the system frequency deviation when no control measures are taken and the time when the maximum value of the system frequency deviation occurs when no control measures are taken, based on the frequency response curve.

[0105] The third determining module 630 is used to determine the maximum system frequency deviation when taking control measures based on the control frequency response curve;

[0106] The calculation module 640 is used to calculate the generator control measure quantity using the control quantity calculation formula, based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation occurs when no control measures are taken, the maximum system frequency deviation when control measures are taken, and the size of the system disturbance. The control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding a preset threshold after the disturbance.

[0107] Optionally, the device 600 also includes:

[0108] The control measures module is used to perform control operations on the generator when the frequency deviation after the disturbance reaches a preset threshold, and to record the timing of the control measures.

[0109] Optionally, the formula for calculating the control quantity is as follows:

[0110]

[0111] Among them, f m f′ represents the maximum system frequency deviation when no control measures are taken. m t represents the maximum system frequency deviation when control measures are implemented. m t1 represents the time when the system frequency deviation reaches its maximum value without control measures, t1 represents the time when control measures are implemented, ΔP represents the magnitude of the control variable, ΔP0 represents the magnitude of the system disturbance, and T represents the time when the system frequency deviation reaches its maximum value without control measures. J is the inertial time constant of the generator set.

[0112] Exemplary electronic devices

[0113] Figure 7 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 7 As shown, the electronic device 70 includes one or more processors 71 and a memory 72.

[0114] The processor 71 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0115] The memory 72 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 71 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 73 and an output device 74, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0116] In addition, the input device 73 may also include, for example, a keyboard, a mouse, etc.

[0117] The output device 74 can output various information to the outside. The output device 74 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0118] Of course, for the sake of simplicity, Figure 7 Only some of the components of the electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0119] Exemplary computer program products and computer-readable storage media

[0120] In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0121] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0122] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods for information mining of historical change records according to various embodiments of the present invention as described in the "Exemplary Methods" section above.

[0123] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0124] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0125] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0126] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0127] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0128] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0129] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A frequency-stabilized quantization control method based on the action within the dead zone of a speed governor, characterized in that, include: The frequency response curve of the generator after the power grid disturbance is obtained, the maximum value of the frequency deviation in the frequency is detected, and if the maximum value is greater than the set three-line defense start threshold, the generator is controlled to determine the control frequency response curve of the generator after the control measures are taken. Based on the frequency response curve, determine the maximum system frequency deviation without control measures and the time when the maximum system frequency deviation occurs without control measures; Based on the control frequency response curve, determine the maximum system frequency deviation when control measures are taken; Using the formula for calculating the control measure quantity, the generator control measure quantity is calculated based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation occurs when no control measures are taken, the maximum system frequency deviation when control measures are taken, and the magnitude of the system disturbance. The generator control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding a preset threshold after the disturbance.

2. The method according to claim 1, characterized in that, Also includes: When the frequency deviation after the disturbance reaches a preset threshold, the generator is controlled and the timing of the control action is recorded.

3. The method according to claim 2, characterized in that, The formula for calculating the amount of control measures is as follows: in, This represents the maximum system frequency deviation without any control measures in place. This represents the maximum system frequency deviation when control measures are implemented. This represents the time when the system frequency deviation reaches its maximum value without any control measures being implemented. When to take control measures To control the magnitude of the measures, For the magnitude of the system disturbance, is the inertial time constant of the generator set.

4. A frequency stabilization quantization control device based on the action within the dead zone of a speed governor, characterized in that, include: The first determining module is used to acquire the frequency response curve of the generator after the power grid disturbance, detect the maximum value of the frequency deviation in the frequency, and perform control operation on the generator when the maximum value is greater than the set three-line defense start threshold, and determine the control frequency response curve of the generator after the control measures are taken. The second determining module is used to determine, based on the frequency response curve, the maximum value of the system frequency deviation when no control measures are taken and the time when the maximum value of the system frequency deviation occurs when no control measures are taken; The third determining module is used to determine the maximum system frequency deviation when control measures are taken, based on the control frequency response curve. The calculation module is used to calculate the generator control measure quantity using the control measure quantity calculation formula, based on the maximum system frequency deviation when no control measures are taken, the time when the maximum system frequency deviation when no control measures are taken occurs, the maximum system frequency deviation when control measures are taken, and the size of the system disturbance. The generator control measure quantity is used to prevent the maximum frequency deviation of the generator from exceeding a preset threshold after the disturbance.

5. The apparatus according to claim 4, characterized in that, Also includes: The control measures module is used to perform control operations on the generator when the frequency deviation after the disturbance reaches a preset threshold, and to record the timing of the control measures.

6. The apparatus according to claim 5, characterized in that, The formula for calculating the amount of control measures is as follows: in, This represents the maximum system frequency deviation without any control measures in place. This represents the maximum system frequency deviation when control measures are implemented. This represents the time when the system frequency deviation reaches its maximum value without any control measures being implemented. When to take control measures To control the magnitude of the measures, For the magnitude of the system disturbance, is the inertial time constant of the generator set.

7. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-3.

8. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-3.

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