Flywheel inertia control method and flywheel inertia control device

Abstract

The invention provides a flywheel inertia control method and a flywheel inertia control device, and the method comprises the steps: obtaining measurement data from a phase measurement device in each power grid region, and enabling the power grid regions to be obtained through the division of a preset road segment of a power grid line, a phase measuring device is arranged at each power grid node in the power grid area; determining the total system inertia of the power grid according to the measurement data of each power grid region; judging whether the total system inertia is within a preset inertia range or not; if the total system inertia is within a preset inertia range, continuously acquiring measurement data of each power grid region; and if the total system inertia is not in the inertia preset range, determining a target system inertia according to an inertia threshold value, and providing the target system inertia for a power grid. According to the invention, the flywheel frequency modulation system provides the target system inertia for the power grid, and the stability of the power grid is improved.

Description

Technical Field

[0001] The present application relates to the technical field of power grid frequency regulation, and in particular to a flywheel inertia control method and a flywheel inertia control device. Background Art

[0002] At present, with the rapid development and large-scale access of renewable energy (such as wind power and solar energy), the energy structure of the power system is undergoing revolutionary changes. Traditional fossil fuel-based power generation is gradually being replaced by clean new energy, which provides huge opportunities for reducing carbon emissions and responding to climate change.

[0003] However, one of the challenges that comes with it is the impact of the access of a large number of renewable energy sources on the inertia of the power system. When renewable energy is connected to the power grid on a large scale, due to the characteristics of these energy sources (such as the intermittent and uncontrollable nature of wind and solar energy), they will occupy the startup space of conventional units, reducing the system's rotational inertia and frequency regulation capabilities. The number and inertia of traditional synchronous generators may be reduced, resulting in reduced inertia of the power system, faster changes in grid frequency, larger fluctuations, and larger steady-state frequency deviations, which in turn increases the risk of over-limits in the power grid. Summary of the invention

[0004] In view of this, an object of the present application is to provide a flywheel inertia control method and a flywheel inertia control device to overcome at least one of the above-mentioned defects.

[0005] In a first aspect, an embodiment of the present application provides a flywheel inertia control method, the method comprising: acquiring metering data from a phase measurement device in each power grid area, the power grid area being divided according to a preset section of a power grid route, and a phase measurement device being arranged at each power grid node within the power grid area; determining the total system inertia of the power grid according to the metering data of each power grid area; judging whether the total system inertia is within a preset inertia range; if the total system inertia is within the preset inertia range, continuing to acquire metering data from each power grid area; if the total system inertia is not within the preset inertia range, determining the target system inertia according to an inertia threshold, and providing the target system inertia to the power grid.

[0006] In an optional embodiment of the present application, the power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia; wherein the total system inertia is determined by: determining the first subsystem inertia of the first power grid area and the second subsystem inertia of the second power grid system; and summing the first subsystem inertia and the second subsystem inertia to determine the total system inertia.

[0007] In an optional embodiment of the present application, the metering data of the first power grid area includes a first voltage phase, a first power flow and a first output phase angle, and the metering data of the second power grid area includes a second voltage phase, a second power flow and a second output phase angle, wherein the inertia of the first subsystem of the first power grid area is determined in the following manner: determining a phase difference according to the first voltage phase of the first power grid area and the second voltage phase of the second power grid area; determining a first inertia coefficient according to a ratio of the first power flow of the first power grid area to the phase difference; determining the inertia of the first subsystem of the first power grid area according to the first inertia coefficient, the first voltage phase, the second voltage phase and the first output phase angle.

[0008] In an optional embodiment of the present application, the inertia of the second subsystem of the second power grid area is determined in the following manner: a second inertia coefficient is determined based on the ratio of the second power flow in the second power grid area to the phase difference; and the inertia of the second subsystem of the second power grid area is determined based on the second inertia coefficient, the first voltage phase, the second voltage phase and the second output phase angle.

[0009] In an optional embodiment of the present application, the inertia of the first subsystem is determined by the following formula:

[0010]

[0011] Among them, H1 represents the first subsystem inertia of the first power grid area, K1 represents the first inertia coefficient, A1 represents the first voltage phase of the first power grid area, A2 represents the second voltage phase of the second power grid area, and w1 represents the first output phase angle of the first power grid area.

[0012] In an optional embodiment of the present application, the target system inertia is determined by: determining the difference between the inertia threshold and the total system inertia; using the difference as the target system inertia, and controlling the flywheel frequency regulation system to provide the target system inertia to the power grid to maintain power grid stability.

[0013] In a second aspect, an embodiment of the present application further provides a flywheel inertia control device, the device comprising: a first acquisition module, used to acquire metering data from a phase measurement device in each power grid area, the power grid area being obtained by dividing the preset sections of the power grid route, and a phase measurement device being arranged at each power grid node within the power grid area; a total system inertia determination module, used to determine the total system inertia of the power grid according to the metering data of each power grid area; a judgment module, used to judge whether the total system inertia is within a preset inertia range; a second acquisition module, used to continue to acquire metering data of each power grid area if the total system inertia is within the preset inertia range; a target system inertia determination module, used to determine the target system inertia according to an inertia threshold if the total system inertia is not within the preset inertia range, and provide the target system inertia to the power grid.

[0014] In an optional embodiment of the present application, the power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia; wherein the total system inertia determination module performs the following processing: determining the first subsystem inertia of the first power grid area and the second subsystem inertia of the second power grid system; summing the first subsystem inertia and the second subsystem inertia to determine the total system inertia.

[0015] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the method described above are performed.

[0016] In a fourth aspect, an embodiment of the present application further 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 described above are executed.

[0017] The flywheel inertia control method and flywheel inertia control device provided in the embodiment of the present application obtain metering data from the phase measurement device in each power grid area, the power grid area is obtained by dividing the preset sections of the power grid route, and a phase measurement device is set at each power grid node in the power grid area; according to the metering data of each power grid area, the total system inertia of the power grid is determined; it is judged whether the total system inertia is within the preset range of inertia; if the total system inertia is within the preset range of inertia, the metering data of each power grid area is continued to be obtained; if the total system inertia is not within the preset range of inertia, the target system inertia is determined according to the inertia threshold, and the target system inertia is provided for the power grid. Through this application, the total system inertia of the power grid is monitored in real time, and adjusted when necessary to ensure the stability of the power grid, which helps to reduce frequency fluctuations and voltage fluctuations in the power grid and improve the power supply quality of the power grid.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flow chart of a flywheel inertia control method provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a first power grid area and a second power grid area provided in an embodiment of the present application;

[0022] Figure 3 A flow chart for determining the inertia of a first subsystem in a first power grid area provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of a flywheel inertia control device provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0026] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied to the field of power grid frequency regulation.

[0027] Research has found that new energy has been gradually applied to power grids, and new energy power generation technology will inevitably become the main means of power supply in the future. When new energy is connected to the power grid on a large scale, it will occupy the startup space of conventional units, reduce the system's rotational inertia, and reduce the frequency regulation capability, resulting in faster changes in power grid frequency, increased fluctuations, and increased steady-state frequency deviations, which in turn leads to increased over-limit risks. Since new energy power generation equipment does not have the inertia and primary frequency regulation capabilities to respond to changes in system frequency, the power system's self-regulation and anti-interference capabilities will gradually decline. When faced with power grid frequency deviations due to DC interlocking, fault cutting or load mutations, the safe and stable operation of the power grid will be greatly threatened.

[0028] Since new energy sources (such as wind power, photovoltaics, etc.) are usually volatile and difficult to control, and lack the system inertia provided by traditional equipment such as synchronous generators, this may lead to a decrease in the stability of the power system when facing disturbances. Traditional power system analysis methods may not be able to accurately describe the intrinsic characteristics of the system. In the process of promoting decentralized management of power systems, problems such as information asymmetry and coordination difficulties may be encountered. There are challenges in insufficient system inertia, insufficient system intrinsic description, and decentralized management brought about by the access of new energy.

[0029] Based on this, the embodiment of the present application provides a flywheel inertia control method and a flywheel inertia control device, which obtains metering data from a phase measurement device in each power grid area; determines the total system inertia of the power grid based on the metering data of each power grid area; determines whether the total system inertia is within the preset inertia range; if the total system inertia is within the preset inertia range, continues to obtain metering data for each power grid area; if the total system inertia is not within the preset inertia range, determines the target system inertia based on the inertia threshold, and provides the target system inertia for the power grid. Through the present application, the total system inertia of the power grid is monitored in real time, and adjusted when necessary to ensure the stability of the power grid, reduce frequency fluctuations and voltage fluctuations in the power grid, and improve the power supply quality of the power grid. By real-time monitoring and adjusting the system inertia, it can be ensured that the power grid can quickly restore stability when disturbed, thereby avoiding accidents.

[0030] See also Figure 1 , Figure 1 This is a flow chart of the flywheel inertia control method provided in the embodiment of the present application. Figure 1 As shown in , the flywheel inertia control method provided by the embodiment of the present application includes:

[0031] S101. Acquire metering data from a phase measurement device in each power grid area.

[0032] The power grid area is obtained by dividing the preset sections of the power grid route, and a phase measurement device is set at each power grid node in the power grid area.

[0033] Among them, the phase measurement device (PMU) is a phasor measurement unit that uses the global positioning system (GPS) second pulse as a synchronous clock. It can be used in the fields of dynamic monitoring, system protection, and system analysis and prediction of power systems. The PMU based on the GPS clock can measure phasor data such as voltage phase and current phase at the hub of the power system, and transmit the data to the monitoring main station through the communication network.

[0034] S102: Determine the total system inertia of the power grid according to the metering data of each power grid area.

[0035] Here, the power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia.

[0036] where the total system inertia is determined by:

[0037] A first subsystem inertia of the first grid area and a second subsystem inertia of the second grid system are determined.

[0038] In the power system, system inertia is an important concept, which reflects the system's resistance to frequency changes. Simply put, the larger the system inertia, the smaller the frequency change when the system faces load changes or power output changes, and the better the system stability.

[0039] When the power system is divided into different grid areas (such as the first grid area and the second grid area), each area has its corresponding subsystem inertia. The "subsystem inertia" here can be understood as the sum of the rotational inertia of all generator sets in the grid area, which reflects the area's resistance to frequency changes.

[0040] This total system inertia reflects the overall resistance of the entire power system to frequency changes. It is crucial for the planning and operation of power systems because it can help engineers evaluate the stability of the system in the face of different disturbances and take corresponding measures to improve the stability and reliability of the system.

[0041] See also Figure 2 , Figure 2 This is a schematic diagram of the first power grid area and the second power grid area provided in the embodiment of the present application. Figure 2 As shown in , the schematic diagram provided by the embodiment of the present application includes: a first power grid area 21 and a second power grid area 22.

[0042] It should be noted that the actual power system may contain multiple grid areas, not just two. In this case, the method for determining the total system inertia is still to add the subsystem inertia of all grid areas. This application takes two grid areas, the first grid area 21 and the second grid area 22 as an example.

[0043] See also Figure 3 , Figure 3 A flow chart for determining the inertia of the first subsystem in the first power grid area provided in an embodiment of the present application. Figure 3 As shown in , the flywheel inertia control method provided by the embodiment of the present application includes:

[0044] The inertia of the first subsystem of the first power grid area is determined in the following manner:

[0045] S301 . Determine a phase difference according to a first voltage phase in a first power grid area and a second voltage phase in a second power grid area.

[0046] Here, in the process of determining the inertia of the first subsystem in the first grid area, we need to comprehensively consider multiple factors, including voltage phase, power flow, inertia coefficient, and output phase angle.

[0047] Phase measurement devices are installed in the first grid area and the second grid area respectively to monitor the change of voltage phase in real time. These phase measurement devices can measure the phase of the voltage signal with high precision and provide accurate data for subsequent phase difference calculation.

[0048] According to the first voltage phase of the first grid area and the second voltage phase of the second grid area, the phase difference between the two is calculated. The phase difference reflects the phase relationship of the voltage signals between the two grid areas and is an important parameter for the subsequent calculation of the inertia coefficient and the subsystem inertia.

[0049] S302, determining a first inertia coefficient according to a ratio of a first power flow in a first power grid area to a phase difference;

[0050] Here, in the first power grid area, a flow measurement device is installed to monitor the flow changes in the power grid in real time. The flow measurement device can measure parameters such as current, voltage and power in the power grid to provide data support for subsequent inertia coefficient calculations.

[0051] Specifically, the first inertia coefficient is calculated according to the ratio of the first power flow and the phase difference in the first power grid area. The inertia coefficient is a parameter reflecting the inertia size of the power grid area, and is related to factors such as the generator sets, loads and network structure in the power grid.

[0052] S303: Determine the inertia of a first subsystem in the first power grid area according to the first inertia coefficient, the first voltage phase, the second voltage phase, and the first output phase angle.

[0053] The output phase angle is the phase difference between the voltage and the current in the power grid, which reflects the power factor and harmonic conditions of the power grid. In the first power grid area, the data of the first output phase angle is obtained by a phase measurement device.

[0054] Specifically, according to the first inertia coefficient, the first voltage phase, the second voltage phase and the first output phase angle, an appropriate mathematical model or algorithm is used to calculate the first subsystem inertia of the first power grid area. The subsystem inertia reflects the resistance of the power grid area to frequency changes and is an important indicator for evaluating power grid stability.

[0055] Here, in the entire calculation process, it is necessary to ensure the accuracy of all measured data. If there are errors or anomalies in the data, the calculation results may be inaccurate. Since the operating status of the power grid changes in real time, it is necessary to monitor the voltage phase, power flow, and output phase angle in the power grid in real time to update the calculation results of the subsystem inertia in a timely manner.

[0056] Specifically, the inertia of the first subsystem is determined by the following formula:

[0057]

[0058] Among them, H1 represents the first subsystem inertia of the first power grid area, K1 represents the first inertia coefficient, A1 represents the first voltage phase of the first power grid area, A2 represents the second voltage phase of the second power grid area, and w1 represents the first output phase angle of the first power grid area.

[0059] Specifically, similar to the calculation of the inertia of the first subsystem, the inertia of the second subsystem of the second power grid area is determined in the following manner:

[0060] determining a second inertia coefficient according to a ratio of a second power flow in the second power grid area to the phase difference;

[0061] In the second power grid area, existing flow measurement devices are installed or used to monitor the flow changes in the area in real time. These measurement devices should be able to accurately record key parameters such as current, voltage and power, providing an accurate data basis for subsequent calculations.

[0062] The phase difference, as an important parameter for connecting two grid areas (such as the first grid area and the second grid area), is also used in this step. The phase difference reflects the relative position of the voltage signal between the two grid areas and is crucial for calculating the inertia coefficient.

[0063] Here, the second inertia coefficient is calculated by using the ratio of the second power flow in the second power grid area to the phase difference through appropriate mathematical operations. The second inertia coefficient is a parameter that reflects the inertia characteristics of the second power grid area, and is affected by many factors such as the power grid structure, the type and number of generator sets, and the load characteristics.

[0064] A second subsystem inertia of the second power grid area is determined according to the second inertia coefficient, the first voltage phase, the second voltage phase, and the second output phase angle.

[0065] In addition to the phase difference, it is also necessary to obtain the second voltage phase and the second phase angle of the second grid area. The second voltage phase reflects the phase information of the voltage signal of the second grid area, while the second phase angle reveals the phase relationship between voltage and current.

[0066] In an optional embodiment, based on the known second inertia coefficient, the first voltage phase (for comparing and associating the two power grid areas), the second voltage phase and the second output phase angle, an appropriate mathematical model or algorithm is constructed. This model or algorithm should be able to comprehensively consider these factors to accurately calculate the inertia of the second subsystem of the second power grid area. In this application, the collected data can be input into the constructed model, and the calculation process can be executed to obtain the specific value of the inertia of the second subsystem.

[0067] Specifically, the inertia of the second subsystem is determined by the following formula:

[0068]

[0069] Among them, H2 represents the second subsystem inertia of the second power grid area, K2 represents the second inertia coefficient, A1 represents the first voltage phase of the first power grid area, A2 represents the second voltage phase of the second power grid area, and w2 represents the second output phase angle of the second power grid area.

[0070] Sum the inertia of the first subsystem and the inertia of the second subsystem to determine the total system inertia.

[0071] S103: Determine whether the total system inertia is within a preset inertia range.

[0072] Here, the flywheel frequency regulation system receives the metering data sent by the phase measurement device in real time and calculates the total system inertia, which reflects the inertial characteristics of the current power grid.

[0073] According to the operation requirements, safety standards and historical data of the power grid, a reasonable preset range of inertia is set. This range is usually an interval, indicating the upper and lower limits of inertia required for stable operation of the power grid.

[0074] The total system inertia monitored in real time is compared with a preset range to determine whether it is within the range.

[0075] S104: If the total system inertia is within the preset inertia range, continue to obtain metering data of each power grid area.

[0076] Here, if the total system inertia is within the preset inertia range, it means that the total system inertia is compliant, indicating that the power grid is currently in a stable state, and the metering data of each power grid area, such as voltage, current, power, etc., can continue to be monitored to ensure the continued stable operation of the power grid.

[0077] Conduct in-depth analysis on the acquired metering data to understand the operating status of the power grid, load changes, and potential failure risks, and provide decision support for subsequent scheduling and control.

[0078] S105: If the total system inertia is not within the preset inertia range, determine the target system inertia according to the inertia threshold, and provide the target system inertia for the power grid.

[0079] Here, if the total system inertia does not meet the preset range, a target system inertia needs to be determined based on an inertia threshold. The inertia threshold is usually set based on the safety standards and stability requirements of the power grid.

[0080] Specifically, the target system inertia is determined by:

[0081] The difference between the inertia threshold and the total system inertia is determined; the difference is used as the target system inertia, and the flywheel frequency regulation system is controlled to provide the target system inertia for the power grid to maintain the stability of the power grid.

[0082] Calculate the difference between the inertia threshold and the total system inertia. This difference is the inertia that needs to be supplemented or adjusted.

[0083] The flywheel frequency regulation system is an energy storage device that can quickly respond to changes in grid frequency. It can change the stored kinetic energy by adjusting its own rotation speed, thereby providing or absorbing power to the grid to maintain the frequency stability of the grid. According to the determined target system inertia, the flywheel frequency regulation system is controlled to provide the required inertia to the grid at an appropriate speed and in an appropriate manner. This usually involves precise control of the flywheel speed and real-time regulation of power.

[0084] In the process of the flywheel frequency regulation system providing inertia, it is necessary to monitor the frequency, power and other parameters of the power grid, as well as the status and performance of the flywheel energy storage device in real time. According to the monitoring results, the control strategy of the flywheel frequency regulation system should be adjusted in time to ensure that it can effectively maintain the stable operation of the power grid.

[0085] In summary, by real-time monitoring of the total system inertia, setting a reasonable preset inertia range, and adjusting the control strategy of the flywheel frequency regulation system according to actual conditions, the stable operation of the power grid can be effectively maintained and the safety and reliability of the power system can be improved.

[0086] Flywheel energy storage technology uses the law of conservation of angular momentum in physics to convert electrical energy into mechanical energy and store it in a rotating flywheel. When the power system needs additional electrical energy or inertia support, the flywheel can quickly convert the stored mechanical energy into electrical energy output to meet the needs of the power grid.

[0087] The flywheel frequency modulation system stores energy through the rotation of the flywheel. When the grid frequency fluctuates, the system can respond quickly and release or absorb energy by adjusting the rotation speed of the flywheel, thereby suppressing excessive frequency changes.

[0088] The flywheel frequency regulation system has the ability to respond quickly and can respond to frequency fluctuations in the power grid within a few milliseconds to a few seconds. This fast response capability enables the flywheel frequency regulation system to effectively provide system inertia and help the power grid maintain stability.

[0089] The flywheel frequency regulation system is usually connected to the dispatching system of the power system, and determines whether additional inertia support is needed by monitoring the frequency deviation of the power grid in real time. When the frequency deviation exceeds the preset range, the system will start the flywheel energy storage unit to charge or discharge to adjust the frequency of the power grid.

[0090] The flywheel frequency regulation system has efficient and stable performance and can continuously provide reliable inertia support for the power grid. The flywheel frequency regulation system is a clean energy storage method that does not pollute the environment. Since the working principle of flywheel energy storage technology is relatively simple and the mechanical parts have less wear, the flywheel frequency regulation system usually has a longer service life. The flywheel frequency regulation system can be combined with other power regulation technologies, such as infinite capacity inverter technology and superconducting energy storage technology, to improve the stability and safety of the power system.

[0091] The flywheel inertia control method and flywheel inertia control device provided in the embodiment of the present application obtain metering data from the phase measurement device in each power grid area, the power grid area is obtained by dividing the preset sections of the power grid route, and a phase measurement device is set at each power grid node in the power grid area; according to the metering data of each power grid area, the total system inertia of the power grid is determined; it is judged whether the total system inertia is within the preset range of inertia; if the total system inertia is within the preset range of inertia, the metering data of each power grid area is continued to be obtained; if the total system inertia is not within the preset range of inertia, the target system inertia is determined according to the inertia threshold, and the target system inertia is provided for the power grid. Through this application, the total system inertia of the power grid is monitored in real time, and adjusted when necessary to ensure the stability of the power grid, which helps to reduce frequency fluctuations and voltage fluctuations in the power grid and improve the power supply quality of the power grid.

[0092] The present application can monitor the total system inertia of the power grid in real time and make adjustments when necessary to ensure the stability of the power grid, which helps to reduce frequency fluctuations and voltage fluctuations in the power grid and improve the power supply quality of the power grid; the power grid may be subject to various external interferences during operation, such as weather changes, equipment failures, etc. The present application can enhance the power grid's ability to resist these interferences by adjusting the system inertia, thereby ensuring that the power grid can still maintain stable operation when interfered with.

[0093] By real-time monitoring of the total system inertia of the power grid, the grid dispatchers can more accurately understand the operating status of the power grid and formulate more reasonable dispatching strategies, which is helpful to optimize the power flow distribution of the power grid, reduce power loss in the power grid, and improve the energy efficiency of the power grid; the application of the present application can reduce the risk of accidents caused by insufficient inertia of the power grid. By real-time monitoring and adjustment of system inertia, it can ensure that the power grid can quickly restore stability when disturbed, thereby avoiding accidents; the present application is an important part of the intelligent construction of the power grid. By introducing advanced control algorithms and technologies, it can realize the automatic control and intelligent management of the power grid, and improve the reliability and safety of the power grid.

[0094] From the above analysis, it can be seen that the present application can solve the contradiction between the weakening of system inertia caused by the large-scale access of renewable energy and the cost of solving inertia. The present application obtains the measured data of the actual power grid system through advanced inertia evaluation methods, and compensates for the system inertia of the power grid through the judgment of the flywheel frequency regulation system, which is more intelligent and accurately solves the practical problem of insufficient system inertia.

[0095] Based on the same inventive concept, a flywheel inertia control device corresponding to the flywheel inertia control method is also provided in the embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned flywheel inertia control method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0096] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of the flywheel inertia control device provided in the embodiment of the present application. Figure 4 As shown in , the flywheel inertia control device 400 includes:

[0097] A first acquisition module 401 is used to acquire metering data from a phase measurement device in each power grid area, wherein the power grid area is obtained by dividing a preset section of a power grid route, and a phase measurement device is set at each power grid node in the power grid area;

[0098] A total system inertia determination module 402 is used to determine the total system inertia of the power grid according to the metering data of each power grid area;

[0099] A judgment module 403 is used to judge whether the total system inertia is within a preset inertia range;

[0100] A second acquisition module 404 is used to continue acquiring metering data of each power grid area if the total system inertia is within the preset inertia range;

[0101] The target system inertia determination module 405 is used to determine the target system inertia according to the inertia threshold if the total system inertia is not within the preset inertia range, and provide the target system inertia to the power grid.

[0102] Here, the power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia;

[0103] The total system inertia determination module performs the following processing:

[0104] Determining a first subsystem inertia of a first power grid region and a second subsystem inertia of a second power grid system;

[0105] The first subsystem inertia and the second subsystem inertia are summed to determine the total system inertia.

[0106] See also Figure 5 , Figure 5 This is a schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Figure 5 As shown in , the electronic device 500 includes a processor 510 , a memory 520 and a bus 530 .

[0107] The memory 520 stores machine-readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 communicates with the memory 520 via the bus 530. When the machine-readable instructions are executed by the processor 510, the above-mentioned Figure 1 The steps of the flywheel inertia control method in the method embodiment shown and the specific implementation methods can be found in the method embodiment, which will not be repeated here.

[0108] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 The steps of the flywheel inertia control method in the method embodiment shown and the specific implementation methods can be found in the method embodiment, which will not be repeated here.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0110] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0111] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0112] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0113] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially or in other words, the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0114] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A flywheel inertia control method, characterized in that: include: Acquiring metering data from a phase measurement device in each power grid area, wherein the power grid area is obtained by dividing a preset section of a power grid route, and a phase measurement device is provided at each power grid node in the power grid area; Determine the total system inertia of the grid based on metering data for each grid area; Determining whether the total system inertia is within a preset inertia range; If the total system inertia is within the preset inertia range, continue to obtain metering data of each power grid area; If the total system inertia is not within the preset inertia range, a target system inertia is determined according to an inertia threshold value, and the target system inertia is provided to the power grid.

2. The method according to claim 1, characterized in that The power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia; The total system inertia is determined in the following manner: Determining a first subsystem inertia of a first power grid region and a second subsystem inertia of a second power grid system; The first subsystem inertia and the second subsystem inertia are summed to determine the total system inertia.

3. The method according to claim 2, characterized in that The metering data of the first power grid area includes a first voltage phase, a first power flow and a first output phase angle, and the metering data of the second power grid area includes a second voltage phase, a second power flow and a second output phase angle. The inertia of the first subsystem of the first power grid area is determined in the following manner: Determining a phase difference according to a first voltage phase in the first power grid area and a second voltage phase in the second power grid area; determining a first inertia coefficient according to a ratio of a first power flow in the first power grid area to the phase difference; A first subsystem inertia of the first power grid area is determined according to the first inertia coefficient, the first voltage phase, the second voltage phase, and a first output phase angle.

4. The method according to claim 3, characterized in that The inertia of the second subsystem in the second grid area is determined by: determining a second inertia coefficient according to a ratio of a second power flow in the second power grid area to the phase difference; A second subsystem inertia of the second power grid area is determined according to the second inertia coefficient, the first voltage phase, the second voltage phase, and the second output phase angle.

5. The method according to claim 3, characterized in that: The inertia of the first subsystem is determined by the following formula: Among them, H1 represents the first subsystem inertia of the first power grid area, K1 represents the first inertia coefficient, A1 represents the first voltage phase of the first power grid area, A2 represents the second voltage phase of the second power grid area, and w1 represents the first output phase angle of the first power grid area.

6. The method according to claim 1, characterized in that The target system inertia is determined by: determining a difference between an inertia threshold and the total system inertia; The difference is used as the target system inertia, and the flywheel frequency regulation system is controlled to provide the target system inertia for the power grid, so as to maintain the stability of the power grid.

7. A flywheel inertia control device, characterized in that: include: A first acquisition module is used to acquire metering data from a phase measurement device in each power grid area, wherein the power grid area is obtained by dividing a preset section of a power grid route, and a phase measurement device is provided at each power grid node in the power grid area; A total system inertia determination module is used to determine the total system inertia of the power grid based on the metering data of each power grid area; A judging module, used for judging whether the total system inertia is within a preset inertia range; A second acquisition module, configured to continue acquiring metering data of each power grid area if the total system inertia is within a preset inertia range; The target system inertia determination module is used to determine the target system inertia according to the inertia threshold if the total system inertia is not within the preset inertia range, and provide the target system inertia to the power grid.

8. The device according to claim 7, characterized in that The power grid area includes a first power grid area and a second power grid area, and each power grid area corresponds to a subsystem inertia; The total system inertia determination module performs the following processing: Determining a first subsystem inertia of a first power grid region and a second subsystem inertia of a second power grid system; The first subsystem inertia and the second subsystem inertia are summed to determine the total system inertia.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the memory via the bus, and the processor executes the machine-readable instructions to perform the steps of any method as claimed in claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are executed.

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