Peak regulation and frequency modulation control method and device for electric power system, computer equipment and medium

Abstract

The invention relates to a peak regulation and frequency modulation control method and device for an electric power system, computer equipment, a computer readable storage medium and a computer program product, and can be applied to the technical field of electric power. The method comprises the following steps: acquiring load power and power generation frequency of a to-be-controlled power system; determining peak regulation control information of the power system according to power difference information between the load power and preset power, and determining frequency modulation control information of the power system according to frequency difference information between the power generation frequency and preset frequency; according to the peak regulation control information and the frequency modulation control information, peak regulation and frequency modulation coordination control is carried out on a compressed air energy storage system and a flywheel energy storage system, so that peak regulation and frequency modulation control is carried out on the power system; the electric power system is connected with the compressed air energy storage system and the flywheel energy storage system. The method can improve the efficiency of peak regulation and frequency modulation control of the power system.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, device, computer equipment, computer-readable storage medium and computer program product for peak and frequency regulation control of an electric power system. Background Art

[0002] With the development of power system control technology, peak load regulation and frequency regulation have become important means to ensure the stable operation of the power grid. How to efficiently control the peak load regulation and frequency regulation of the power system has become an important research direction.

[0003] Traditional technology usually performs peak-shaving and frequency-regulating control of power systems by manually adjusting the output of generator sets; however, performing peak-shaving and frequency-regulating control of power systems by this method requires a lot of manual processing time, resulting in low efficiency of peak-shaving and frequency-regulating control of power systems. Summary of the invention

[0004] Based on this, it is necessary to provide a power system peak-shaving and frequency-regulation control method, device, computer equipment, computer-readable storage medium and computer program product that can improve the efficiency of power system peak-shaving and frequency-regulation control in response to the above-mentioned technical problems.

[0005] In a first aspect, the present application provides a method for controlling peak load and frequency regulation of a power system. The method comprises:

[0006] Obtaining the load power and generation frequency of the power system to be controlled;

[0007] Determine peak load control information of the power system according to power difference information between the load power and the preset power, and determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0008] According to the peak shaving control information and the frequency modulation control information, peak shaving and frequency modulation coordinated control is performed on the compressed air energy storage system and the flywheel energy storage system, so that peak shaving and frequency modulation control is performed on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

[0009] In one embodiment, the peak-shaving and frequency-regulating coordinated control of the compressed air energy storage system and the flywheel energy storage system is performed according to the peak-shaving control information and the frequency-regulating control information, so that the peak-shaving and frequency-regulating control of the power system is performed, including:

[0010] According to the peak-shaving control information, the compressed air energy storage system is subjected to peak-shaving control, so that the power system is subjected to peak-shaving control;

[0011] The flywheel energy storage system is frequency-controlled according to the frequency control information, so that the power system is frequency-controlled.

[0012] In one embodiment, performing peak shaving control on the compressed air energy storage system according to the peak shaving control information includes:

[0013] When the peak-shaving control information is the first peak-shaving control information, controlling the compressed air energy storage system to convert the electric energy corresponding to the peak-shaving control information into compressed air for storage;

[0014] When the peak-shaving control information is the second peak-shaving control information, the compressed air energy storage system is controlled to convert the compressed air corresponding to the peak-shaving control information into electrical energy for output.

[0015] In one embodiment, determining the peak load control information of the power system according to the power difference information between the load power and the preset power includes:

[0016] When the power difference information indicates that the load power is less than the preset power, determining that the peak-shaving control information is the first peak-shaving control information;

[0017] When the power difference information indicates that the load power is greater than the preset power, the peak-shaving control information is determined to be the second peak-shaving control information.

[0018] In one embodiment, the frequency control of the flywheel energy storage system according to the frequency control information includes:

[0019] When the frequency modulation control information is the first frequency modulation control information, controlling the flywheel energy storage system to convert the electrical energy corresponding to the frequency modulation control information into the kinetic energy of the flywheel;

[0020] In the case where the frequency modulation control information is the second frequency modulation control information, the flywheel energy storage system is controlled to convert the kinetic energy of the flywheel corresponding to the frequency modulation control information into electrical energy for output.

[0021] In one embodiment, determining the frequency modulation control information of the power system according to the frequency difference information between the power generation frequency and the preset frequency includes:

[0022] When the frequency difference information indicates that the power generation frequency is greater than the preset frequency, determining that the frequency modulation control information is the first frequency modulation control information;

[0023] When the frequency difference information indicates that the power generation frequency is less than the preset frequency, the frequency modulation control information is determined to be the second frequency modulation control information.

[0024] In a second aspect, the present application also provides a peak-shaving and frequency-regulating control device for a power system. The device comprises:

[0025] A frequency acquisition module, used to acquire the load power and generation frequency of the power system to be controlled;

[0026] an information determination module, configured to determine peak load control information of the power system according to power difference information between the load power and the preset power, and to determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0027] A system control module is used to coordinate the peak-shaving and frequency-regulating control of a compressed air energy storage system and a flywheel energy storage system according to the peak-shaving control information and the frequency-regulating control information, so as to perform peak-shaving and frequency-regulating control on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

[0028] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0029] Obtaining the load power and generation frequency of the power system to be controlled;

[0030] Determine peak load control information of the power system according to power difference information between the load power and the preset power, and determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0031] According to the peak shaving control information and the frequency modulation control information, peak shaving and frequency modulation coordinated control is performed on the compressed air energy storage system and the flywheel energy storage system, so that peak shaving and frequency modulation control is performed on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

[0032] In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0033] Obtaining the load power and generation frequency of the power system to be controlled;

[0034] Determine peak load control information of the power system according to power difference information between the load power and the preset power, and determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0035] According to the peak shaving control information and the frequency modulation control information, peak shaving and frequency modulation coordinated control is performed on the compressed air energy storage system and the flywheel energy storage system, so that peak shaving and frequency modulation control is performed on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

[0036] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0037] Obtaining the load power and generation frequency of the power system to be controlled;

[0038] Determine peak load control information of the power system according to power difference information between the load power and the preset power, and determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0039] According to the peak shaving control information and the frequency modulation control information, peak shaving and frequency modulation coordinated control is performed on the compressed air energy storage system and the flywheel energy storage system, so that peak shaving and frequency modulation control is performed on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

[0040] The above-mentioned power system peak-shaving and frequency-regulation control method, device, computer equipment, computer-readable storage medium and computer program product obtain the load power and power generation frequency of the power system to be controlled; determine the peak-shaving control information of the power system according to the power difference information between the load power and the preset power, and determine the frequency regulation control information of the power system according to the frequency difference information between the power generation frequency and the preset frequency; according to the peak-shaving control information and the frequency regulation control information, coordinate the peak-shaving and frequency-regulation of the compressed air energy storage system and the flywheel energy storage system, so that the peak-shaving and frequency-regulation control of the power system is performed; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively. This solution obtains the load power and power generation frequency of the power system to be controlled, and compares them with the preset values ​​to determine the peak-shaving and frequency-regulating control information, which is beneficial to accurately grasp the operating status of the power grid; by combining the compressed air energy storage system and the flywheel energy storage system, the large capacity characteristics of compressed air energy storage and the rapid response characteristics of flywheel energy storage are fully utilized to achieve coordinated control of the power system, which is beneficial to improve the efficiency and accuracy of peak-shaving and frequency regulation; this method can not only cope with large-scale load changes, but also respond quickly to frequency fluctuations, adapt to the uncertainty brought by the grid connection of new energy, effectively improve the efficiency of peak-shaving and frequency-regulating control of the power system, and promote the stable operation of the new power system and the improvement of power supply quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical 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 paying creative work.

[0042] Figure 1 It is a flowchart of a method for controlling peak load and frequency regulation of a power system in one embodiment;

[0043] Figure 2 It is a schematic diagram of the structure of peak-shaving and frequency-modulating of a system in one embodiment;

[0044] Figure 3 A schematic diagram of a process flow of peak load regulation control of a compressed air energy storage system in one embodiment;

[0045] Figure 4 A schematic diagram of a flow chart of frequency modulation control of a flywheel energy storage system in one embodiment;

[0046] Figure 5 It is a structural block diagram of a peak-shaving and frequency-regulating control device for a power system in one embodiment;

[0047] Figure 6 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0050] In an exemplary embodiment, Figure 1As shown, a method for peak-shaving and frequency-regulating control of a power system is provided. This embodiment takes the method applied to a terminal as an example for explanation; it is understandable that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. Among them, the terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc.; the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services. In this embodiment, the method includes the following steps:

[0051] Step S101, obtaining the load power and generation frequency of the power system to be controlled.

[0052] Step S102, determining peak load control information of the power system according to power difference information between load power and preset power, and determining frequency regulation control information of the power system according to frequency difference information between power generation frequency and preset frequency.

[0053] Step S103, according to the peak-shaving control information and the frequency-modulation control information, the compressed air energy storage system and the flywheel energy storage system are coordinated to perform peak-shaving and frequency-modulation control on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system respectively.

[0054] The power system can be a complex system consisting of power generation, transmission, distribution and consumption, which is used to produce, transmit and distribute electrical energy. For example, the power system can include power plants, transmission lines, substations and distribution networks.

[0055] The load power may be the actual electric energy power consumed in the power system. For example, the load power may be the total power consumption of all electric devices in the power grid at a certain moment or during a certain period of time.

[0056] The power generation frequency may be the vibration frequency of the alternating current in the power system, for example, the power generation frequency may be 50 Hz or 60 Hz.

[0057] The preset power may be an ideal or standard power value preset by the power system, for example, the preset power may be an average daily load power determined based on historical data and load forecast, or may be a rated power.

[0058] The preset frequency may be an ideal or standard frequency value preset in the power system, for example, the preset frequency may be a rated frequency of the power grid.

[0059] The peak load control information may be a control instruction or parameter for adjusting the power balance of the power system. For example, the peak load control information may include the amount of power generation that needs to be increased or decreased, the charge and discharge instructions of the energy storage system, etc.

[0060] The frequency modulation control information may be a control instruction or parameter for adjusting the frequency stability of the power system. For example, the frequency modulation control information may include the output of the generator set to be adjusted, the rapid response instruction of the energy storage system, etc.

[0061] Among them, the compressed air energy storage system can be an energy storage device that uses electrical energy to compress air and store it, and releases the compressed air when needed to drive a generator to generate electricity. For example, the compressed air energy storage system can include equipment such as a compressor, an air storage chamber, an expander, and a generator.

[0062] Among them, the flywheel energy storage system can be an energy storage device that uses electrical energy to drive a flywheel to rotate at high speed to store kinetic energy and converts the kinetic energy back to electrical energy when needed. For example, the flywheel energy storage system can include a motor, a generator, a high-speed rotating flywheel and related control equipment.

[0063] Among them, peak-shaving and frequency-regulation coordinated control can be a comprehensive control that takes into account both power balance and frequency stability. For example, peak-shaving and frequency-regulation coordinated control can use a compressed air energy storage system to perform large-capacity peak-shaving and a flywheel energy storage system to perform rapid frequency regulation.

[0064] Optionally, the terminal (which may also be the power system control center) obtains the real-time load power and power generation frequency data of the power system. The terminal compares the real-time load power obtained with the preset power, calculates the power difference information, and determines the peak control information based on the power difference information. At the same time, the terminal compares the real-time power generation frequency obtained with the preset frequency, calculates the frequency difference information, and determines the frequency control information based on the frequency difference information. Then, the terminal sends corresponding control instructions to the compressed air energy storage system and the flywheel energy storage system based on the peak control information and the frequency control information to realize the coordinated control of the peak and frequency regulation of the power system.

[0065] For example, when the real-time load power of the power system is lower than the preset power, the terminal sends a charging instruction to the compressed air energy storage system to convert the excess electrical energy into compressed air for storage. When the real-time load power is higher than the preset power, the terminal sends a discharge instruction to the compressed air energy storage system to release compressed air to drive the generator to generate electricity. At the same time, when the real-time power generation frequency of the power system is higher than the preset frequency, the terminal sends a charging instruction to the flywheel energy storage system to convert the excess electrical energy into the kinetic energy of the flywheel. When the real-time power generation frequency is lower than the preset frequency, the terminal sends a discharge instruction to the flywheel energy storage system to convert the kinetic energy of the flywheel into electrical energy. Through this coordinated control, precise peak and frequency regulation of the power system is achieved.

[0066] In the above-mentioned power system peak-shaving and frequency-regulating control method, the load power and the power generation frequency of the power system to be controlled are obtained; the peak-shaving control information of the power system is determined according to the power difference information between the load power and the preset power, and the frequency regulation control information of the power system is determined according to the frequency difference information between the power generation frequency and the preset frequency; according to the peak-shaving control information and the frequency regulation control information, the compressed air energy storage system and the flywheel energy storage system are coordinated and controlled for peak-shaving and frequency regulation, so that the power system is controlled for peak-shaving and frequency regulation; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively. This solution obtains the load power and power generation frequency of the power system to be controlled, and compares them with the preset values ​​to determine the peak-shaving and frequency-regulating control information, which is beneficial to accurately grasp the operating status of the power grid; by combining the compressed air energy storage system and the flywheel energy storage system, the large capacity characteristics of compressed air energy storage and the rapid response characteristics of flywheel energy storage are fully utilized to achieve coordinated control of the power system, which is beneficial to improve the efficiency and accuracy of peak-shaving and frequency regulation; this method can not only cope with large-scale load changes, but also respond quickly to frequency fluctuations, adapt to the uncertainty brought by the grid connection of new energy, effectively improve the efficiency of peak-shaving and frequency-regulating control of the power system, and promote the stable operation of the new power system and the improvement of power supply quality.

[0067] In an exemplary embodiment, based on the peak shaving control information and the frequency modulation control information, the compressed air energy storage system and the flywheel energy storage system are coordinated and controlled for peak shaving and frequency modulation, so that the power system is subjected to peak shaving and frequency modulation control, which specifically includes the following contents: based on the peak shaving control information, the compressed air energy storage system is subjected to peak shaving control, so that the power system is subjected to peak shaving control; based on the frequency modulation control information, the flywheel energy storage system is subjected to frequency modulation control, so that the power system is subjected to frequency modulation control.

[0068] Among them, the peak-shaving control information can be a control instruction or parameter used to adjust the power balance of the power system. For example, the peak-shaving control information may include the power generation that needs to be increased or decreased, the charging and discharging instructions of the compressed air energy storage system, etc.

[0069] The frequency modulation control information may be a control instruction or parameter for regulating the frequency stability of the power system. For example, the frequency modulation control information may include the output of the generator set that needs to be adjusted, the rapid response instruction of the flywheel energy storage system, etc.

[0070] Among them, peak-shaving control can be to balance the supply and demand of the power system by adjusting the charging and discharging of the energy storage system. For example, peak-shaving control can be to release the energy in the compressed air energy storage system during the peak period of power load, and store the excess power in the compressed air energy storage system during the low period of power load.

[0071] Among them, frequency control can be to maintain the frequency stability of the power system by quickly adjusting the charging and discharging of the energy storage system. For example, frequency control can be to allow the flywheel energy storage system to absorb excess electrical energy when the frequency of the power system is high, and to allow the flywheel energy storage system to release electrical energy when the frequency of the power system is low.

[0072] Optionally, the terminal calculates the difference between the real-time load power and the preset power. When the real-time load power is lower than the preset power, the terminal sends a control instruction to the compressed air energy storage system according to the peak load control information to control the compressed air energy storage system to convert the excess electric energy into compressed air for storage; when the real-time load power is higher than the preset power, the terminal controls the compressed air energy storage system to release compressed air to drive the generator to generate electricity. At the same time, the terminal calculates the difference between the real-time power generation frequency and the preset frequency. When the real-time power generation frequency is higher than the preset frequency, the terminal sends a control instruction to the flywheel energy storage system according to the frequency modulation control information to control the flywheel energy storage system to absorb the excess electric energy; when the real-time power generation frequency is lower than the preset frequency, the flywheel energy storage system is controlled to release electric energy.

[0073] The technical solution provided in this embodiment, by respectively utilizing a compressed air energy storage system for peak shaving control and a flywheel energy storage system for frequency regulation control, is conducive to giving full play to the large capacity characteristics of compressed air energy storage and the rapid response characteristics of flywheel energy storage, thereby facilitating improving the peak shaving and frequency regulation capabilities of the power system, being able to better adapt to the volatility and uncertainty brought about by the connection of new energy to the grid, and promoting the stable operation of the new power system and the improvement of power supply quality.

[0074] In an exemplary embodiment, peak-shaving control is performed on a compressed air energy storage system according to peak-shaving control information, specifically including the following contents: when the peak-shaving control information is the first peak-shaving control information, the compressed air energy storage system is controlled to convert the electrical energy corresponding to the peak-shaving control information into compressed air for storage; when the peak-shaving control information is the second peak-shaving control information, the compressed air energy storage system is controlled to convert the compressed air corresponding to the peak-shaving control information into electrical energy for output.

[0075] Among them, the peak-shaving control information can be a control instruction or parameter used to guide the compressed air energy storage system to perform peak-shaving operations. For example, the peak-shaving control information can include data such as the amount of electrical energy that needs to be stored or released, the pressure and flow of compressed air, etc.

[0076] Among them, the first peak-shaving control information may be a control instruction instructing the compressed air energy storage system to convert electrical energy into compressed air for storage. For example, the first peak-shaving control information may include time information of the grid load trough period, the amount of electrical energy that needs to be stored, etc.

[0077] Among them, the second peak-shaving control information may be a control instruction instructing the compressed air energy storage system to convert compressed air into electrical energy for output. For example, the second peak-shaving control information may include time information of the peak load period of the power grid, the amount of electrical energy that needs to be released, etc.

[0078] Among them, the electric energy corresponding to the peak-shaving control information can be electric energy stored or released according to the electric energy specified in the peak-shaving control information. For example, the electric energy corresponding to the peak-shaving control information can be excess electric energy during the low load period of the power grid or electric energy that needs to be supplemented during the peak load period of the power grid.

[0079] Among them, the compressed air corresponding to the peak-shaving control information can be compressed air stored or released according to the compressed air quantity specified in the peak-shaving control information. For example, the compressed air corresponding to the peak-shaving control information can be compressed air stored during the low load period of the power grid or compressed air that needs to be released during the peak load period of the power grid.

[0080] Optionally, the terminal generates peak-shaving control information based on the comparison result between the real-time load power and the preset power. When the real-time load power is less than the preset power, the terminal generates first peak-shaving control information and sends the first peak-shaving control information to the compressed air energy storage system. After receiving the first peak-shaving control information, the compressed air energy storage system starts the compressor to convert excess electrical energy into compressed air, and stores the compressed air in the air storage chamber. When the real-time load power is greater than the preset power, the terminal generates second peak-shaving control information and sends the second peak-shaving control information to the compressed air energy storage system. After receiving the second peak-shaving control information, the compressed air energy storage system releases the compressed air in the air storage chamber, and drives the generator through the expander to convert the compressed air into electrical energy and output it to the power grid.

[0081] The technical solution provided in this embodiment is conducive to accurate peak regulation of the power system by flexibly controlling the charging and discharging process of the compressed air energy storage system according to the peak regulation control information. Excess electric energy is stored during the low-load period of the power load, and electric energy is released during the peak period, which is conducive to balancing the supply and demand relationship of the power grid and improving the regulation capacity of the power system. This method makes full use of the large-capacity characteristics of compressed air energy storage, adapts to the volatility brought about by the grid connection of new energy, and promotes the stable operation of the new power system and the improvement of power supply quality.

[0082] In an exemplary embodiment, peak shaving control information of the power system is determined based on power difference information between the load power and the preset power, specifically including the following contents: when the power difference information indicates that the load power is less than the preset power, the peak shaving control information is determined to be the first peak shaving control information; when the power difference information indicates that the load power is greater than the preset power, the peak shaving control information is determined to be the second peak shaving control information.

[0083] Optionally, the terminal determines the peak shaving control information based on the power difference information. When the power difference information indicates that the load power is less than the preset power, the terminal determines that the peak shaving control information is the first peak shaving control information, and sends the first peak shaving control information to the compressed air energy storage system, instructing the compressed air energy storage system to convert excess electrical energy into compressed air for storage. When the power difference information indicates that the load power is greater than the preset power, the terminal determines that the peak shaving control information is the second peak shaving control information, and sends the second peak shaving control information to the compressed air energy storage system, instructing it to convert compressed air into electrical energy for output. For example, when the power difference information indicates that the load power is equal to the preset power, the terminal can confirm that the load power matches the preset power, and there is no need to control the compressed air energy storage system to convert excess electrical energy into compressed air for storage, nor is there a need to control the compressed air energy storage system to convert compressed air into electrical energy for output.

[0084] The technical solution provided in this embodiment dynamically determines the peak-shaving control information by comparing the difference between the load power and the preset power, which is beneficial to accurately control the charging and discharging process of the compressed air energy storage system, thereby balancing the supply and demand relationship of the power grid and improving the regulation capacity of the power system.

[0085] In an exemplary embodiment, frequency modulation control is performed on a flywheel energy storage system according to the frequency modulation control information, specifically including the following contents: when the frequency modulation control information is the first frequency modulation control information, the flywheel energy storage system is controlled to convert the electrical energy corresponding to the frequency modulation control information into the kinetic energy of the flywheel; when the frequency modulation control information is the second frequency modulation control information, the flywheel energy storage system is controlled to convert the kinetic energy of the flywheel corresponding to the frequency modulation control information into electrical energy for output.

[0086] Among them, the electric energy corresponding to the frequency modulation control information can be the electric energy stored or released according to the electric energy specified in the frequency modulation control information. For example, the electric energy corresponding to the frequency modulation control information can be the electric energy that needs to be absorbed when the grid frequency is high or the electric energy that needs to be released when the grid frequency is low.

[0087] Among them, the kinetic energy of the flywheel corresponding to the frequency modulation control information can be the flywheel kinetic energy stored or released according to the energy specified in the frequency modulation control information. For example, the kinetic energy of the flywheel corresponding to the frequency modulation control information can be the kinetic energy stored when the grid frequency is high or the kinetic energy that needs to be released when the grid frequency is low.

[0088] Optionally, when it is detected that the grid frequency is higher than the rated frequency, the terminal generates a first frequency modulation control information and sends the first frequency modulation control information to the flywheel energy storage system. After the flywheel energy storage system receives the first frequency modulation control information, it starts the motor to drive the flywheel to accelerate the rotation and convert the excess electrical energy into the kinetic energy of the flywheel. When it is detected that the grid frequency is lower than the rated frequency, the terminal generates a second frequency modulation control information and sends the second frequency modulation control information to the flywheel energy storage system. After receiving the second frequency modulation control information, the flywheel energy storage system controls the flywheel to decelerate and converts the kinetic energy of the flywheel into electrical energy through the generator and outputs it to the grid.

[0089] The technical solution provided in this embodiment is conducive to quickly responding to changes in grid frequency by dynamically controlling the charging and discharging process of the flywheel energy storage system according to the frequency regulation control information, thereby facilitating accurate regulation of the power system frequency, improving the frequency regulation capability of the power plant, and promoting the stable operation of the power system and the improvement of power supply quality.

[0090] In an exemplary embodiment, frequency modulation control information of the power system is determined based on frequency difference information between the power generation frequency and the preset frequency, specifically including the following contents: when the frequency difference information indicates that the power generation frequency is greater than the preset frequency, the frequency modulation control information is determined to be the first frequency modulation control information; when the frequency difference information indicates that the power generation frequency is less than the preset frequency, the frequency modulation control information is determined to be the second frequency modulation control information.

[0091] Among them, the first frequency modulation control information can be a control instruction that instructs the flywheel energy storage system to convert electrical energy into flywheel kinetic energy. For example, the first frequency modulation control information can include information that the grid frequency is higher than the preset frequency, the amount of electrical energy that needs to be absorbed, etc.

[0092] Among them, the second frequency modulation control information can be a control instruction that instructs the flywheel energy storage system to convert flywheel kinetic energy into electrical energy. For example, the second frequency modulation control information can include information that the grid frequency is lower than the preset frequency, the amount of electrical energy that needs to be released, etc.

[0093] Optionally, the terminal determines the frequency modulation control information based on the frequency difference information. When the frequency difference information indicates that the power generation frequency is greater than the preset frequency, the terminal determines that the frequency modulation control information is the first frequency modulation control information, and sends the first frequency modulation control information to the flywheel energy storage system, instructing the flywheel energy storage system to convert excess electrical energy into kinetic energy of the flywheel. When the frequency difference information indicates that the power generation frequency is less than the preset frequency, the terminal determines that the frequency modulation control information is the second frequency modulation control information, and sends the second frequency modulation control information to the flywheel energy storage system, instructing the flywheel energy storage system to convert the kinetic energy of the flywheel into electrical energy for output. For example, when the frequency difference information indicates that the power generation frequency is equal to the preset frequency, the terminal can confirm that the power grid is operating stably, and there is no need to control the flywheel energy storage system to convert excess electrical energy into kinetic energy of the flywheel, nor is there a need to control the flywheel energy storage system to convert the kinetic energy of the flywheel into electrical energy for output.

[0094] The technical solution provided in this embodiment dynamically determines the frequency regulation control information by monitoring the difference between the power generation frequency and the preset frequency, which is beneficial to accurately control the charging and discharging process of the flywheel energy storage system, thereby facilitating rapid response to changes in grid frequency and improving the frequency regulation capability of the power system.

[0095] The following is an application example to illustrate the power system peak-shaving and frequency-regulating control method provided in the present application. This application example uses the method applied to a terminal as an example.

[0096] Peak load regulation and frequency regulation of power systems are important links in the operation and management of power systems. Their main purpose is to ensure the stable operation and power supply quality of power systems. Peak load regulation refers to the power system adjusting the power output of power plants or changing the operation mode of the power grid according to the changes in the load of the power grid to meet the power demand in different time periods and maintain the supply and demand balance of the power grid. Frequency regulation refers to the power system adjusting the output of generator sets to maintain the frequency of the power grid within the specified range to ensure the stability of power supply and power quality.

[0097] With the large-scale grid connection of new energy, the power system is transforming into a new power system with new energy as the main body. This involves the development of large-scale renewable energy, the intelligent operation of the power system, and the large-scale application of energy storage technology, in order to adapt to the volatility and uncertainty of new energy and improve the regulation capacity of the system.

[0098] The power system is an indispensable and important infrastructure in modern society. The peak-shaving and frequency-regulation in its operation and management are key links to ensure the stable operation and power supply quality of the power system. Peak-shaving refers to the power system adjusting the power output of power plants or changing the operation mode of the power grid according to the changes in the load of the power grid to meet the power demand in different time periods and maintain the balance of supply and demand of the power grid. Frequency regulation refers to the power system adjusting the output of the generator set to maintain the frequency of the power grid within the prescribed range to ensure the stability of power supply and the quality of power. With the large-scale grid connection of new energy, the power system is transforming into a new power system with new energy as the main body. This involves the development of large-scale renewable energy, the intelligent operation of the power system, and the large-scale application of energy storage technology to adapt to the volatility and uncertainty of new energy and improve the regulation ability of the system. As an emerging technical means, energy storage technology can absorb the excess power of the power grid and store it, and then release it back to the power grid when needed, thereby realizing the time and space transfer and management of the energy of the power system.

[0099] Energy storage technologies mainly include pumped storage, compressed air storage, electrochemical storage, flywheel storage, etc. Among them, pumped storage is a relatively mature technology. It uses excess electricity from the power grid to pump water, raises the water level to a high-level pool, and generates electricity by releasing water when needed, thereby achieving energy storage and release in the power system. Compressed air energy storage is a technology that uses compressed air during off-peak electricity prices and stores it in high-pressure gas tanks / salt caverns, and releases compressed air during peak hours to drive generators to generate electricity. Electrochemical energy storage achieves energy storage and release in the power system through the charging and discharging of battery packs. Flywheel energy storage achieves energy storage and release in the power system through high-speed rotating flywheels.

[0100] This application example improves the peak load regulation capability of the power plant by connecting compressed air energy storage to the power plant, and improves the frequency regulation capability of the power plant by connecting to flywheel energy storage. It makes full use of the technical characteristics of compressed air energy storage and flywheel energy storage, and provides new control methods and control ideas for building a new power system. This application example combines the large energy storage capacity and high reliability of compressed air energy storage with the fast charging and discharging speed and long cycle life of flywheel energy storage to perform peak load regulation and frequency regulation work on the power plant.

[0101] In this application example, compressed air energy storage is connected to a power plant to improve the peak load regulation capability of the power plant. In specific implementation, compressed air energy storage facilities can be built to quickly respond to changes in power demand. During peak load periods, excess electricity can be converted into compressed air and stored in the air storage chamber. During low load periods, the compressed air can be released, and the high-temperature and high-pressure gas can drive the expander to generate electricity, thereby achieving peak load regulation of the power plant.

[0102] Reference for the schematic diagram of the peak and frequency regulation system Figure 2, including flywheel, power plant, motor, compressor, heat exchanger, gas storage tank, heat exchanger, expander and power grid.

[0103] The capacity of compressed air energy storage can be estimated based on the average of the local load, and the average daily load power is calculated to be P. In order to ensure the safety of power grid electricity consumption, the excess power generation is set to xP, that is, (1+x)P is set as the rated power generation power of the power plant. When the real-time load power P' is less than (1+x)P, the excess electricity is input into the compressed air energy storage and stored in the form of compressed air; when the real-time load power P' is greater than (1+x)P, the high-pressure air is released to drive the expander to generate electricity, and the power generation is adjusted by adjusting the mass flow rate of the high-pressure gas.

[0104] Compressed air energy storage system peak load control process reference Figure 3 , including: estimating the average daily power consumption, setting the rated power of the power plant, judging whether the real-time load power is less than the rated power. If not, the compressed air energy storage participates in the peak regulation, and the high-pressure gas drives the expander to generate electricity. If so, the excess power generation is transmitted to the compressed air energy storage until the load and power generation match.

[0105] The flywheel energy storage is connected to the power plant to improve the frequency regulation capability of the power plant. In specific implementation, flywheel energy storage facilities can be built to take advantage of its ability to quickly respond to changes in power frequency. When the power frequency is abnormal, the flywheel is driven by the motor to rotate or decelerate quickly, thereby quickly absorbing or releasing electrical energy, adjusting the frequency of the power system, and improving the frequency regulation of the power plant. The rated frequency of the power grid is f, but the power load is not fixed. When the power load fluctuates, the frequency of the power grid changes. When the power generation frequency f'>rated frequency f, the excess electricity is connected to the flywheel energy storage system and quickly converted into the kinetic energy of the flywheel; when the power generation frequency f'<rated frequency f, the flywheel converts kinetic energy into electrical energy to provide rapid support for the power system. This system makes good use of the fast response speed of the flywheel energy storage system and can provide strong support for the frequency regulation of the power system.

[0106] Reference for frequency control process of flywheel energy storage system Figure 4 , including: determining the rated frequency of the power grid, judging that the power generation frequency = the rated frequency of the power grid, if so, judging that the power grid is operating stably, if not, judging that the power generation frequency is greater than the rated frequency of the power grid, if so, the flywheel consumes electricity and the speed increases, and the power generation frequency is adjusted, if not, the flywheel drives the motor to generate electricity, the speed decreases, and the power generation frequency is adjusted until the power grid operates stably.

[0107] By utilizing the technical characteristics of compressed air energy storage and flywheel energy storage, new control methods and control ideas are provided for building new power systems. In specific implementation, the coordinated control of compressed air energy storage and flywheel energy storage systems can be used to accurately adjust the load of the power system and improve the stability and power supply quality of the power system. For example, during peak power load periods, the energy storage capacity of compressed air energy storage and flywheel energy storage systems can be used simultaneously to quickly absorb excess electrical energy; during low power load periods, the release capacity of compressed air energy storage and flywheel energy storage systems can be used simultaneously to quickly supplement power supply, thereby achieving precise regulation of the power system.

[0108] The technical solution provided in this application example achieves: Improving peak-shaving capacity: By connecting compressed air energy storage and power plants, the high energy density and long cycle life of compressed air energy storage can be used to improve the peak-shaving capacity of power plants; Improving frequency regulation capacity: By connecting flywheel energy storage and power plants, the high response speed and long cycle life of flywheel energy storage can be used to improve the frequency regulation capacity of power plants; Comprehensive utilization of technical characteristics: Fully utilizing the technical characteristics of compressed air energy storage and flywheel energy storage, by connecting the two to power plants, complementary advantages are achieved; Promoting the construction of new power systems: It provides new control methods and control ideas for building new power systems, which is conducive to promoting the development of large-scale renewable energy, the intelligent operation of power systems, and the large-scale application of energy storage technologies.

[0109] 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.

[0110] Based on the same inventive concept, the embodiment of the present application also provides a power system peak-shaving and frequency-regulation control device for implementing the power system peak-shaving and frequency-regulation control method 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 one or more power system peak-shaving and frequency-regulation control device embodiments provided below can refer to the limitations of the power system peak-shaving and frequency-regulation control method above, and will not be repeated here.

[0111] In an exemplary embodiment, Figure 5As shown, a power system peak-shaving and frequency-regulating control device is provided, and the power system peak-shaving and frequency-regulating control device 500 may include:

[0112] The frequency acquisition module 501 is used to acquire the load power and generation frequency of the power system to be controlled;

[0113] An information determination module 502 is used to determine peak load control information of the power system according to power difference information between the load power and the preset power, and to determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency;

[0114] The system control module 503 is used to coordinate the peak-shaving and frequency-regulating control of the compressed air energy storage system and the flywheel energy storage system according to the peak-shaving control information and the frequency-regulating control information, so as to perform peak-shaving and frequency-regulating control on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system respectively.

[0115] In an exemplary embodiment, the system control module 503 is also used to perform peak-shaving control on the compressed air energy storage system according to the peak-shaving control information, so as to perform peak-shaving control on the power system; and to perform frequency-regulating control on the flywheel energy storage system according to the frequency-regulating control information, so as to perform frequency-regulating control on the power system.

[0116] In an exemplary embodiment, the system control module 503 is also used to control the compressed air energy storage system to convert the electrical energy corresponding to the peak shaving control information into compressed air for storage when the peak shaving control information is the first peak shaving control information; and to control the compressed air energy storage system to convert the compressed air corresponding to the peak shaving control information into electrical energy for output when the peak shaving control information is the second peak shaving control information.

[0117] In an exemplary embodiment, the information determination module 502 is also used to determine that the peak-shaving control information is the first peak-shaving control information when the power difference information indicates that the load power is less than the preset power; and to determine that the peak-shaving control information is the second peak-shaving control information when the power difference information indicates that the load power is greater than the preset power.

[0118] In an exemplary embodiment, the system control module 503 is also used to control the flywheel energy storage system to convert the electrical energy corresponding to the frequency modulation control information into the kinetic energy of the flywheel when the frequency modulation control information is the first frequency modulation control information; and to control the flywheel energy storage system to convert the kinetic energy of the flywheel corresponding to the frequency modulation control information into electrical energy for output when the frequency modulation control information is the second frequency modulation control information.

[0119] In an exemplary embodiment, the information determination module 502 is also used to determine that the frequency modulation control information is the first frequency modulation control information when the frequency difference information indicates that the power generation frequency is greater than the preset frequency; and to determine that the frequency modulation control information is the second frequency modulation control information when the frequency difference information indicates that the power generation frequency is less than the preset frequency.

[0120] Each module in the above-mentioned power system peak-shaving and frequency-regulating control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0121] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 6 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 the 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 realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for peak-shaving and frequency-modulation control of a power system is realized. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0122] Those skilled in the art will understand that Figure 6 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.

[0123] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0124] In an exemplary 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 in the above-mentioned method embodiments are implemented.

[0125] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0126] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods 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 this application can include at least one of non-volatile 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), magnetoresistive 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, etc., but are not limited to this.

[0127] 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 specification.

[0128] 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 method for peak load and frequency regulation control of a power system, characterized in that: The method comprises: Obtaining the load power and generation frequency of the power system to be controlled; Determine peak load control information of the power system according to power difference information between the load power and the preset power, and determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency; According to the peak shaving control information and the frequency modulation control information, peak shaving and frequency modulation coordinated control is performed on the compressed air energy storage system and the flywheel energy storage system, so that peak shaving and frequency modulation control is performed on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

2. The method according to claim 1, characterized in that The method of performing peak-shaving and frequency-regulating coordinated control on the compressed air energy storage system and the flywheel energy storage system according to the peak-shaving control information and the frequency-regulating control information, so as to perform peak-shaving and frequency-regulating control on the power system, comprises: According to the peak-shaving control information, the compressed air energy storage system is subjected to peak-shaving control, so that the power system is subjected to peak-shaving control; The flywheel energy storage system is frequency-controlled according to the frequency control information, so that the power system is frequency-controlled.

3. The method according to claim 2, characterized in that The step of performing peak load regulation control on the compressed air energy storage system according to the peak load regulation control information includes: When the peak-shaving control information is the first peak-shaving control information, controlling the compressed air energy storage system to convert the electric energy corresponding to the peak-shaving control information into compressed air for storage; When the peak-shaving control information is the second peak-shaving control information, the compressed air energy storage system is controlled to convert the compressed air corresponding to the peak-shaving control information into electrical energy for output.

4. The method according to claim 3, characterized in that The step of determining the peak load control information of the power system according to the power difference information between the load power and the preset power includes: When the power difference information indicates that the load power is less than the preset power, determining that the peak-shaving control information is the first peak-shaving control information; When the power difference information indicates that the load power is greater than the preset power, the peak-shaving control information is determined to be the second peak-shaving control information.

5. The method according to claim 2, characterized in that: The method of performing frequency control on the flywheel energy storage system according to the frequency control information includes: When the frequency modulation control information is the first frequency modulation control information, controlling the flywheel energy storage system to convert the electrical energy corresponding to the frequency modulation control information into the kinetic energy of the flywheel; In the case where the frequency modulation control information is the second frequency modulation control information, the flywheel energy storage system is controlled to convert the kinetic energy of the flywheel corresponding to the frequency modulation control information into electrical energy for output.

6. The method according to claim 5, characterized in that The determining the frequency modulation control information of the power system according to the frequency difference information between the power generation frequency and the preset frequency includes: When the frequency difference information indicates that the power generation frequency is greater than the preset frequency, determining that the frequency modulation control information is the first frequency modulation control information; When the frequency difference information indicates that the power generation frequency is less than the preset frequency, the frequency modulation control information is determined to be the second frequency modulation control information.

7. A peak-shaving and frequency-regulating control device for a power system, characterized in that: The device comprises: A frequency acquisition module, used to acquire the load power and generation frequency of the power system to be controlled; an information determination module, configured to determine peak load control information of the power system according to power difference information between the load power and the preset power, and to determine frequency regulation control information of the power system according to frequency difference information between the power generation frequency and the preset frequency; A system control module is used to coordinate the peak-shaving and frequency-regulating control of a compressed air energy storage system and a flywheel energy storage system according to the peak-shaving control information and the frequency-regulating control information, so as to perform peak-shaving and frequency-regulating control on the power system; the power system is connected to the compressed air energy storage system and the flywheel energy storage system, respectively.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. 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 1 to 6 are implemented.

10. 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 1 to 6 are implemented.

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