Power grid primary frequency modulation system and control method, device, computer equipment, storage medium and program product thereof

Abstract

The present application relates to a primary frequency regulation system of a power grid and its control method, device, computer equipment, storage medium and program product. The system includes a generator circuit breaker, a flywheel grid-connected switch, an energy transmission switch, a flywheel energy storage device, a flywheel side converter, a machine side converter, an excitation device, a demagnetization switch and a controller. Among them, the controller is used to control the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the machine side converter and the flywheel side converter connected to the controller to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand. The system can simply and effectively improve the primary frequency regulation performance indicators of the power grid.

Description

Technical Field

[0001] The present application relates to the technical field of power grid frequency modulation, and in particular to a power grid primary frequency modulation system and a control method, device, computer equipment, storage medium and program product thereof. Background Art

[0002] The primary frequency regulation performance index of the power grid is an important parameter to measure the frequency regulation capability and quality of the power grid. In the power system, due to the volatility and unpredictability of the load, the imbalance between the output power of the generator motor and the load demand is inevitable, which will lead to the fluctuation of the power grid frequency. In order to ensure the stable operation of the power grid, it is necessary to perform primary frequency regulation on the power grid, that is, to compensate for the load fluctuation by adjusting the output power of the generator motor set to keep the power grid frequency within a reasonable range.

[0003] However, traditional grid primary frequency regulation technology often has some unsatisfactory performance indicators, such as slow regulation speed, low regulation accuracy, and limited regulation range. These problems limit the operation efficiency and stability of the grid and affect the reliability and economy of the power system.

[0004] Although the existing automatic frequency regulation technology has been improved, the algorithm is complex and difficult to implement. Therefore, it is necessary to study a simple, effective and easy-to-implement method to solve the primary frequency regulation performance index of the power grid to meet the needs of my country's power grid operation and dispatching. Summary of the invention

[0005] Based on this, it is necessary to provide a power grid primary frequency regulation system and its control method, device, computer equipment, storage medium and program product that can simply and effectively improve the primary frequency regulation performance indicators of the power grid in response to the above technical problems.

[0006] In a first aspect, the present application provides a power grid primary frequency regulation system, the power grid primary frequency regulation system comprising:

[0007] A generator circuit breaker, a first end of the generator circuit breaker is used to connect to the low voltage side of the main transformer of the power grid, and a second end of the generator circuit breaker is used to connect to the first end of the generator motor;

[0008] A flywheel grid-connected switch, wherein a first end of the flywheel grid-connected switch is used to connect to a low-voltage side of a main transformer;

[0009] An energy transmission switch, wherein a first end of the energy transmission switch is used to connect to a first end of the generator motor;

[0010] Flywheel energy storage device;

[0011] A flywheel-side converter, wherein a first end of the flywheel-side converter is connected to a flywheel energy storage device;

[0012] A machine-side converter, wherein a first end of the machine-side converter is respectively connected to a second end of the energy transmission switch and a second end of the flywheel grid-connected switch, and a second end of the machine-side converter is connected to a second end of the flywheel-side converter;

[0013] An excitation device, wherein a first end of the excitation device is used to connect to a power supply;

[0014] A demagnetization switch, wherein a first end of the demagnetization switch is connected to a second end of the excitation device, and a second end of the demagnetization switch is used to connect to a second end of the generator motor;

[0015] The controller is used to control the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter connected to the controller to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand.

[0016] In one embodiment, the controller is used to adjust the flywheel-side converter and the generator-side converter to the primary frequency regulation mode according to the primary frequency regulation demand; close the flywheel grid-connected switch so that the flywheel energy storage device regulates the frequency of the power grid;

[0017] Among them, in the primary frequency modulation mode, the operating parameters of the flywheel side converter and the generator side converter correspond to the primary frequency modulation mode.

[0018] In one of the embodiments, the controller is also used to adjust the operating frequency of the flywheel-side converter and close the flywheel grid-connected switch according to the flywheel energy recovery demand when the flywheel energy storage device reaches the maximum energy storage capacity; disconnect the flywheel grid-connected switch when the flywheel speed of the flywheel energy storage device is reduced to a preset speed; disconnect the generator circuit breaker and the demagnetization switch; adjust the flywheel-side converter, the machine-side converter and the excitation device to the flywheel energy recovery mode, and close the demagnetization switch and the energy transmission switch in sequence, so that the generator motor transmits energy to the flywheel energy storage device during braking;

[0019] Among them, in the flywheel energy recovery mode, the operating parameters of the flywheel side converter and the machine side converter correspond to the flywheel energy recovery mode.

[0020] In a second aspect, the present application further provides a control method for a primary frequency modulation system of a power grid, which is applied to the primary frequency modulation system of a power grid in the above embodiment, and the control method includes:

[0021] According to the primary frequency regulation demand, the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter are controlled to be in a working state corresponding to the primary frequency regulation demand.

[0022] In one embodiment, according to the primary frequency regulation demand, driving the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the machine-side converter and the flywheel-side converter to be in a working state corresponding to the primary frequency regulation demand includes:

[0023] According to the primary frequency regulation requirements, the flywheel-side converter and the generator-side converter are adjusted to the primary frequency regulation mode;

[0024] Close the flywheel grid-connected switch to allow the flywheel energy storage device to adjust the grid frequency;

[0025] Among them, in the primary frequency modulation mode, the operating parameters of the flywheel side converter and the generator side converter correspond to the primary frequency modulation mode.

[0026] In one embodiment, the method further comprises:

[0027] When the flywheel energy storage device reaches the maximum energy storage capacity, the operating frequency of the flywheel side converter is adjusted according to the flywheel energy recovery demand, and the flywheel grid-connected switch is closed;

[0028] When the flywheel speed of the flywheel energy storage device decreases to a preset speed, disconnecting the flywheel grid-connected switch;

[0029] Disconnect the generator circuit breaker and demagnetization switch;

[0030] Adjust the flywheel-side converter, the machine-side converter and the excitation device to the flywheel energy recovery mode, and close the demagnetization switch and the energy transfer switch in sequence, so that the generator motor transfers energy to the flywheel energy storage device during braking;

[0031] Among them, in the flywheel energy recovery mode, the operating parameters of the flywheel side converter and the machine side converter correspond to the flywheel energy recovery mode.

[0032] In a third aspect, the present application further provides a control device for a primary frequency modulation system of a power grid, which is applied to the primary frequency modulation system of the power grid in the above embodiment, and the control device includes:

[0033] The primary frequency regulation module is used to control the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand.

[0034] In a fourth aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method in the above embodiment when executing the computer program.

[0035] In a fifth aspect, the present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method in the above embodiment are implemented.

[0036] In a sixth aspect, the present application also provides a computer program product, including a computer program, which implements the steps of the method in the above embodiment when the computer program is executed by a processor.

[0037] The above-mentioned power grid primary frequency modulation system and its control method, device, computer equipment, storage medium and program product have at least the following beneficial effects:

[0038] By setting up a flywheel energy storage device, when primary frequency regulation of the power grid is required, the flywheel energy storage device is connected to the power grid for grid-connected operation, thereby improving the performance indicators of the primary frequency regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a primary frequency modulation system of a power grid in one embodiment;

[0041] Figure 2 It is a schematic diagram of electrical connection of a primary frequency modulation system of a power grid when performing primary frequency modulation in one embodiment;

[0042] Figure 3 It is a schematic diagram of electrical connection of a primary frequency modulation system of a power grid when flywheel energy recovery is performed in one embodiment;

[0043] Figure 4 A flowchart of the steps of driving the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the generator-side converter and the flywheel-side converter to be in a working state corresponding to the primary frequency regulation requirement according to the primary frequency regulation requirement in one embodiment;

[0044] Figure 5 It is a flowchart of a control method of a primary frequency modulation system of a power grid in one embodiment;

[0045] Figure 6 It is a structural block diagram of a control device of a primary frequency modulation system of a power grid in one embodiment;

[0046] Figure 7 Schematic diagram of the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0047] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0049] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0050] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, the element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0051] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0052] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0053] In an exemplary embodiment, Figure 1 As shown, the present application provides a primary frequency regulation system for a power grid, which includes a generator circuit breaker 2, a flywheel grid-connected switch 4, an energy transmission switch 6, a flywheel energy storage device 8, a flywheel-side converter 10, a machine-side converter 12, an excitation device 14, a demagnetization switch 16, and a controller 18. The first end of the generator circuit breaker 2 is used to connect to the low-voltage side of the main transformer 30 of the power grid 300, and the second end of the generator circuit breaker 2 is used to connect to the first end of the generator motor 50; the first end of the flywheel grid-connected switch 4 is used to connect to the low-voltage side of the main transformer 30; the first end of the energy transmission switch 6 is used to connect to the first end of the generator motor 50; the first end of the flywheel-side converter 10 is connected to the flywheel energy storage device 8; the first end of the machine-side converter 12 is respectively connected to the second end of the energy transmission switch 6 and the second end of the flywheel grid-connected switch 4, and the machine-side converter 12 The second end of the excitation device 14 is connected to the second end of the flywheel side converter 10; the first end of the excitation device 14 is used to connect the power supply 70; the first end of the demagnetization switch 16 is connected to the second end of the excitation device 14, and the second end of the demagnetization switch 16 is used to connect the second end of the generator motor 50; the controller 18 is used to control the generator circuit breaker 2, the flywheel grid-connected switch 4, the energy transmission switch 6, the excitation device 14, the machine-side converter 12 and the flywheel-side converter 10 connected to the controller 18 to be in a working state corresponding to the primary frequency regulation requirement according to the primary frequency regulation requirement.

[0054] Exemplarily, when a primary frequency modulation is required, the flywheel energy storage device 8 is connected to the power grid 300 by adjusting the working states of the generator circuit breaker 2, the flywheel grid-connected switch 4, the energy transmission switch 6, the excitation device 14, the machine-side converter 12 and the flywheel-side converter 10, so that the flywheel energy storage device 8 can be connected to the grid, thereby absorbing the electric energy of the power grid 300 or releasing the electric energy to the power grid 300 through the flywheel energy storage device 8 to assist in the primary frequency modulation, thereby improving the primary frequency modulation performance index.

[0055] The above-mentioned primary frequency modulation system of the power grid is provided with a flywheel energy storage device 8. When the primary frequency modulation of the power grid is required, the flywheel energy storage device 8 is connected to the power grid 300 for grid-connected operation, thereby improving the performance index of the primary frequency modulation.

[0056] In an exemplary embodiment, the controller 18 is used to adjust the flywheel side converter 10 and the machine side converter 12 to the primary frequency regulation mode according to the primary frequency regulation demand; close the flywheel grid-connected switch 4 to enable the flywheel energy storage device 8 to adjust the grid frequency; wherein, in the primary frequency regulation mode, the operating parameters of the flywheel side converter 10 and the machine side converter 12 correspond to the primary frequency regulation mode.

[0057] Exemplarily, for the generator motor 50 in normal operation, generally only the generator circuit breaker 2 and the demagnetization switch 16 are in the on state. When the power grid 300 needs to perform a frequency modulation, the flywheel energy storage device 8 needs to be connected to the power grid 300 for grid-connected operation to achieve grid-connected primary frequency modulation. The specific implementation steps are as follows: For the generator motor 50 that has been in grid-connected operation through the closed generator circuit breaker 2, at this time, the generator circuit breaker 2 and the demagnetization switch 16 are in the on state, while the flywheel grid-connected switch 4 and the energy transmission switch 6 are both in the off state. At this time, if the power grid 300 needs to perform a frequency modulation, it is necessary to set the machine-side converter 12 and the flywheel-side converter 10 to the primary frequency modulation mode. In the primary frequency modulation mode, the operating parameters of the flywheel-side converter 10 and the machine-side converter 12 correspond to the primary frequency modulation mode. After setting the machine-side converter 12 and the flywheel-side converter 10 to the primary frequency modulation mode, close the flywheel grid-connected switch 4 so that the flywheel energy storage device 8 adjusts the grid frequency, such as Figure 2 As shown, the dotted line indicates the disconnected state, and the solid line and the switches filled with shaded areas indicate the on state. For example, in the primary frequency modulation mode, when the grid frequency decreases, the controller 18 controls the flywheel side converter 10 to reduce the frequency, so that the flywheel slows down and the flywheel kinetic energy is released. The released energy sends active power to the grid 300 through the machine side converter 12, the flywheel grid-connected switch 4 and the main transformer 30, thereby suppressing the decrease in grid frequency; when the grid frequency increases, the controller 18 controls the flywheel side converter 10 to increase the frequency, so that the flywheel speeds up, and the flywheel absorbs active power from the grid 300 to increase kinetic energy. The absorbed active power is obtained from the grid 300 through the machine side converter 12, the flywheel grid-connected switch 4 and the main transformer 30, thereby suppressing the increase in grid frequency, thereby cooperating with the generator motor 50 to perform primary frequency modulation control of the grid, and improving the primary frequency modulation performance index of the generator motor 50, wherein the current flows as shown in FIG. Figure 2 When the flywheel energy storage device 8 is no longer needed to be connected to the grid, the control machine-side converter 12 and the flywheel-side converter 10 are stopped, and the flywheel grid-connected switch 4 is disconnected.

[0058] In this embodiment, a specific and feasible method is provided for the flywheel energy storage device 8 to achieve grid-connected operation to participate in primary frequency regulation, thereby improving the primary frequency regulation performance index.

[0059] In an exemplary embodiment, the controller 18 is also used to adjust the operating frequency of the flywheel side converter 10 and close the flywheel grid-connected switch 4 according to the flywheel energy recovery demand when the flywheel energy storage device 8 reaches the maximum energy storage capacity; disconnect the flywheel grid-connected switch 4 when the flywheel speed of the flywheel energy storage device 8 is reduced to a preset speed; disconnect the generator circuit breaker 2 and the demagnetization switch 16; adjust the flywheel side converter 10, the machine side converter 12 and the excitation device 14 to be in the flywheel energy recovery mode, and close the demagnetization switch 16 and the energy transmission switch 6 in sequence, so that the generator motor 50 transmits energy to the flywheel energy storage device 8 during braking; wherein, in the flywheel energy recovery mode, the operating parameters of the flywheel side converter 10 and the machine side converter 12 correspond to the flywheel energy recovery mode.

[0060] Exemplarily, as described above, for the generator motor 50 that has been connected to the grid through the generator circuit breaker 2 (i.e., the generator motor 50 that is in normal operation), the generator circuit breaker 2 and the demagnetization switch 16 are in the on state, while the flywheel grid switch 4 and the energy transmission switch 6 are in the off state. When the generator motor 50 needs to be stopped and braked and the flywheel energy storage device 8 reaches the maximum energy storage capacity, it is necessary to release part of the stored electric energy to the grid 300, and then reserve energy storage space for recovering the remaining kinetic energy during the shutdown and braking process of the generator motor 50. The specific implementation steps are as follows: When the flywheel energy storage device 8 reaches the maximum energy storage capacity, according to the flywheel energy recovery demand, adjust the operating frequency of the flywheel side converter 10, and close the flywheel grid switch 4, control the frequency of the flywheel side converter 10 to decrease rapidly at a certain slope, so that the flywheel can quickly decelerate and release energy to the grid 300 to reserve the energy storage space. The energy storage capacity required for the energy recovery of the group shutdown is set. After the flywheel speed drops to the preset speed, the flywheel grid-connected switch 4 is disconnected; the generator circuit breaker 2 is disconnected to decouple the generator motor 50 from the power grid 300. At the same time, the controller 18 controls the excitation device 14 to stop outputting the excitation current to the generator motor 50 and disconnects the demagnetization switch 16; the grid-side converter, the machine-side converter 12 and the excitation device 14 are set to the flywheel energy recovery mode. At this time, the working parameters of the grid-side converter, the machine-side converter 12 and the excitation device 14 correspond to the flywheel energy recovery mode; the demagnetization switch 16 and the energy transmission switch 6 are closed in sequence, as shown in FIG. Figure 3 As shown, the dotted line indicates that it is in the disconnected state, the solid line and the switches filled with shaded parts indicate that they are in the on state, the excitation device 14 re-outputs the excitation current to the generator motor 50, so that the generator motor 50 uses the remaining kinetic energy to output AC power to the machine-side converter 12, which is converted into DC power by the machine-side converter 12 and output to the flywheel-side converter 10, and the flywheel-side converter 10 inverts the DC power into AC power and outputs it to the flywheel energy storage device 8, so that the flywheel speeds up and converts the electrical energy into kinetic energy for storage, wherein the current flows as shown in FIG. Figure 3As shown by the arrow in the middle. During the kinetic energy recovery process, when the speed of the generator motor 50 is reduced to the set value, the excitation device 14 is controlled to stop outputting the excitation current and the machine-side converter 12 and the grid-side converter are stopped, and the demagnetization switch 16 and the energy transmission switch 6 are disconnected to avoid the generator motor 50 from still maintaining the output of the excitation current and the operation of the machine-side converter 12 and the grid-side converter after the speed no longer meets the requirements of kinetic energy recovery, thereby causing energy waste. When the demagnetization switch 16 and the energy transmission switch 6 are disconnected and in the disconnected state, the machine-side converter 12 and the flywheel-side converter 10 can be set to the flywheel grid-connected mode, and the flywheel grid-connected switch 4 is closed, so that the flywheel releases the energy stored in the kinetic energy recovery to the power grid 300.

[0061] In this embodiment, when the flywheel energy storage device 8 reaches the maximum energy storage capacity, energy is first released through the power grid 300, and then the kinetic energy of the generator motor 50 during the shutdown and braking process is recovered, thereby avoiding energy waste caused by the inability of the flywheel energy storage device 8 to store energy.

[0062] In a second aspect, the present application further provides a control method for a primary frequency modulation system of a power grid, which is applied to the primary frequency modulation system of a power grid in the above embodiment, and the control method includes:

[0063] According to the primary frequency regulation demand, the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter are controlled to be in a working state corresponding to the primary frequency regulation demand.

[0064] The specific implementation of the control method of the primary frequency modulation system of the power grid can refer to the description in the above embodiment, which will not be repeated here. By setting a flywheel energy storage device, when the primary frequency modulation of the power grid is required, the flywheel energy storage device is connected to the power grid for grid-connected operation, thereby improving the performance index of the primary frequency modulation.

[0065] In an exemplary embodiment, Figure 4 As shown, according to the primary frequency regulation demand, the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter are driven to be in a working state corresponding to the primary frequency regulation demand, including:

[0066] S402, adjusting the flywheel-side converter and the generator-side converter to a primary frequency regulation mode according to the primary frequency regulation requirement;

[0067] S404, closing the flywheel grid-connected switch to enable the flywheel energy storage device to adjust the grid frequency;

[0068] Among them, in the primary frequency modulation mode, the operating parameters of the flywheel side converter and the generator side converter correspond to the primary frequency modulation mode.

[0069] The specific implementation of this embodiment can refer to the description in the above embodiment, which will not be repeated here. A specific and feasible method is provided for the flywheel energy storage device to realize grid-connected operation to participate in primary frequency regulation, thereby improving the primary frequency regulation performance index.

[0070] In an exemplary embodiment, Figure 5 As shown, the method also includes:

[0071] S502, when the flywheel energy storage device reaches the maximum energy storage capacity, according to the flywheel energy recovery demand, adjust the operating frequency of the flywheel side converter and close the flywheel grid-connected switch;

[0072] S504, when the flywheel speed of the flywheel energy storage device is reduced to a preset speed, disconnecting the flywheel grid-connected switch;

[0073] S506, disconnect the generator circuit breaker and demagnetization switch;

[0074] S508, adjusting the flywheel-side converter, the generator-side converter and the excitation device to be in the flywheel energy recovery mode, and closing the demagnetization switch and the energy transmission switch in sequence, so that the generator motor transmits energy to the flywheel energy storage device during braking;

[0075] Among them, in the flywheel energy recovery mode, the operating parameters of the flywheel side converter and the machine side converter correspond to the flywheel energy recovery mode.

[0076] The specific implementation of this embodiment can refer to the description in the above embodiment, which will not be repeated here. When the flywheel energy storage device reaches the maximum energy storage capacity, it first releases energy through the power grid, and then recovers the kinetic energy during the shutdown and braking process of the generator motor, avoiding energy waste caused by the inability of the flywheel energy storage device to store energy.

[0077] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0078] Based on the same inventive concept, the embodiment of the present application also provides a control device for a primary frequency regulation system of a power grid for implementing the control method of the primary frequency regulation system of a power grid involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the control device for one or more primary frequency regulation systems of a power grid provided below can refer to the limitations of the control method for the primary frequency regulation system of a power grid above, and will not be repeated here.

[0079] In an exemplary embodiment, Figure 6 As shown, a control device for a primary frequency regulation system of a power grid is provided, comprising: a primary frequency regulation module 602, wherein:

[0080] The primary frequency regulation module 602 is used to control the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand.

[0081] In an exemplary embodiment, the primary frequency modulation module 602 includes:

[0082] The first mode adjustment unit is used to adjust the flywheel-side converter and the machine-side converter to a primary frequency modulation mode according to the primary frequency modulation demand; wherein, in the primary frequency modulation mode, the operating parameters of the flywheel-side converter and the machine-side converter correspond to the primary frequency modulation mode.

[0083] A first control unit is used to close the flywheel grid-connected switch so that the flywheel energy storage device can adjust the grid frequency;

[0084] In an exemplary embodiment, the control device of the primary frequency modulation system of the power grid further includes:

[0085] The frequency adjustment module 604 is used to adjust the operating frequency of the flywheel-side converter and close the flywheel grid-connected switch according to the flywheel energy recovery demand when the flywheel energy storage device reaches the maximum energy storage capacity;

[0086] The first switch control module 606 disconnects the flywheel grid-connected switch when the flywheel speed of the flywheel energy storage device decreases to a preset speed;

[0087] The second switch control module 608 disconnects the generator circuit breaker and the demagnetization switch;

[0088] The energy recovery module 610 adjusts the flywheel-side converter, the machine-side converter and the excitation device to be in the flywheel energy recovery mode, and sequentially closes the demagnetization switch and the energy transmission switch to enable the generator motor to transmit energy to the flywheel energy storage device during braking; wherein, in the flywheel energy recovery mode, the operating parameters of the flywheel-side converter and the machine-side converter correspond to the flywheel energy recovery mode.

[0089] Each module in the control device of the primary frequency modulation system of the above-mentioned power grid can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0090] In an exemplary embodiment, a computer device is provided. The computer device may be a controller, and its internal structure diagram may be as shown in FIG. Figure 7 As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a control method for a primary frequency modulation system of a power grid is implemented.

[0091] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0092] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps of the above-mentioned method embodiments when executing the computer program.

[0093] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method embodiments are implemented.

[0094] In one embodiment, a computer program product is provided, including a computer program, which implements the steps of the above-mentioned method embodiments when executed by a processor.

[0095] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0096] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A primary frequency modulation system of a power grid, characterized in that: The power grid primary frequency regulation system comprises: A generator circuit breaker, wherein a first end of the generator circuit breaker is used to connect to a low voltage side of a main transformer of a power grid, and a second end of the generator circuit breaker is used to connect to a first end of a generator motor; A flywheel grid-connected switch, wherein a first end of the flywheel grid-connected switch is used to connect to a low-voltage side of the main transformer; An energy transmission switch, wherein a first end of the energy transmission switch is used to connect to a first end of the generator motor; Flywheel energy storage device; A flywheel-side converter, wherein a first end of the flywheel-side converter is connected to the flywheel energy storage device; A machine-side converter, wherein a first end of the machine-side converter is respectively connected to a second end of the energy transmission switch and a second end of the flywheel grid-connected switch, and a second end of the machine-side converter is connected to a second end of the flywheel-side converter; An excitation device, wherein a first end of the excitation device is used to connect to a power supply; A demagnetization switch, wherein a first end of the demagnetization switch is connected to a second end of the excitation device, and a second end of the demagnetization switch is used to connect to a second end of the generator motor; A controller, the controller being used to control the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the machine-side converter and the flywheel-side converter connected to the controller to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand; Wherein, the controller is also used to adjust the operating frequency of the flywheel-side converter and close the flywheel grid-connected switch according to the flywheel energy recovery demand when the flywheel energy storage device reaches the maximum energy storage capacity; disconnect the flywheel grid-connected switch when the flywheel speed of the flywheel energy storage device is reduced to a preset speed; disconnect the generator circuit breaker and the demagnetization switch; adjust the flywheel-side converter, the machine-side converter and the excitation device to be in the flywheel energy recovery mode, and close the demagnetization switch and the energy transmission switch in sequence, so that the generator motor transmits energy to the flywheel energy storage device during braking; Wherein, in the flywheel energy recovery mode, the operating parameters of the flywheel-side converter and the generator-side converter correspond to the flywheel energy recovery mode.

2. The power grid primary frequency modulation system according to claim 1, characterized in that: The controller is used to adjust the flywheel-side converter and the generator-side converter to a primary frequency modulation mode according to the primary frequency modulation demand; close the flywheel grid-connected switch so that the flywheel energy storage device adjusts the grid frequency; Wherein, in the primary frequency modulation mode, the operating parameters of the flywheel-side converter and the generator-side converter correspond to the primary frequency modulation mode.

3. A control method for a primary frequency modulation system of a power grid, characterized in that: Applied to the primary frequency modulation system of a power grid as claimed in any one of claims 1 to 2, the control method comprises: According to the primary frequency regulation requirement, controlling the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the machine-side converter and the flywheel-side converter to be in a working state corresponding to the primary frequency regulation requirement; Wherein, the method further comprises: When the flywheel energy storage device reaches the maximum energy storage capacity, the operating frequency of the flywheel-side converter is adjusted according to the flywheel energy recovery demand, and the flywheel grid-connected switch is closed; When the flywheel speed of the flywheel energy storage device decreases to a preset speed, disconnecting the flywheel grid-connected switch; Disconnecting the generator circuit breaker and the demagnetization switch; Adjusting the flywheel-side converter, the machine-side converter and the excitation device to be in a flywheel energy recovery mode, and closing the demagnetization switch and the energy transmission switch in sequence, so that the generator motor transmits energy to the flywheel energy storage device during braking; Wherein, in the flywheel energy recovery mode, the operating parameters of the flywheel-side converter and the generator-side converter correspond to the flywheel energy recovery mode.

4. The control method of the primary frequency modulation system of the power grid according to claim 3, characterized in that: The step of driving the generator circuit breaker, the flywheel grid-connected switch, the energy transmission switch, the excitation device, the machine-side converter and the flywheel-side converter to be in a working state corresponding to the primary frequency regulation requirement according to the primary frequency regulation requirement includes: According to the primary frequency modulation requirement, adjusting the flywheel-side converter and the generator-side converter to a primary frequency modulation mode; Closing the flywheel grid-connected switch to allow the flywheel energy storage device to adjust the grid frequency; Wherein, in the primary frequency modulation mode, the operating parameters of the flywheel-side converter and the generator-side converter correspond to the primary frequency modulation mode.

5. A control device for a primary frequency modulation system of a power grid, characterized in that: Applied to the primary frequency modulation system of a power grid as claimed in any one of claims 1 to 2, the control device comprises: The primary frequency regulation module is used to control the generator circuit breaker, flywheel grid-connected switch, energy transmission switch, excitation device, machine-side converter and flywheel-side converter to be in a working state corresponding to the primary frequency regulation demand according to the primary frequency regulation demand.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 3 to 4 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 3 to 4 are implemented.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 3 to 4 are implemented.

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