Method, device and equipment for evaluating frequency response capability of power grid and medium

Abstract

The embodiment of the invention discloses a power grid frequency response capability evaluation method and device, equipment and a medium. The method comprises the following steps: acquiring a power grid parameter signal of a target power system; wherein the target power system comprises new energy; determining at least one target evaluation index according to the power grid parameter signal; wherein the target evaluation index comprises the overall frequency response capability, and the overall frequency response capability is used for describing the change capability of the overall frequency deviation of the power system only under the action of primary frequency modulation after the power grid load changes under new energy permeation; and evaluating the power grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result. According to the technical scheme, the power grid frequency response capability of the novel power system under new energy permeation can be rapidly and quantitatively evaluated by establishing the power system performance evaluation index, and the primary frequency modulation performance of the power grid of the novel power system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of primary frequency regulation of power grids, and in particular to a method, device, equipment and medium for evaluating the frequency response capability of a power grid. Background Art

[0002] Against the backdrop of global climate change, countries are accelerating the transformation of their energy structures. Renewable energy sources such as wind and solar power continue to increase their share of the global power mix. However, the inherent intermittent, volatile, and random nature of renewable energy generation fundamentally differs from traditional power sources, posing unprecedented challenges to the safe and stable operation of power systems.

[0003] With the increasing penetration of renewable energy, power systems face severe challenges in frequency stability. Renewable energy generation equipment is typically connected to the grid via power electronic converters, increasing frequency sensitivity to disturbances and accelerating the rate of frequency change. Since renewable energy generation typically operates in maximum power point tracking (MPPT) mode, the system's primary frequency regulation capability is significantly reduced when a large number of renewable energy sources replace traditional units. In this context, assessing the grid's frequency response capability is particularly important.

[0004] Related technologies, such as CN118100220A and CN117543620A, focus on the optimization of the power system load frequency self-disturbance rejection control method and the evaluation of frequency stability, but lack a comprehensive evaluation and assessment of the frequency response capability of the new power system grid under the penetration of new energy. Summary of the Invention

[0005] The present invention provides a method, device, equipment and medium for evaluating the frequency response capability of a power grid. By establishing power system performance evaluation indicators, a rapid quantitative evaluation of the power grid frequency response capability of a new power system under the penetration of new energy sources can be performed, which helps to improve the primary frequency regulation performance of the power grid of the new power system.

[0006] According to one aspect of the present invention, a method for evaluating power grid frequency response capability is provided, the method comprising:

[0007] Acquiring a grid parameter signal of a target power system; wherein the target power system includes new energy sources;

[0008] Determining at least one target evaluation indicator based on the grid parameter signal; wherein the target evaluation indicator includes an overall frequency response capability, wherein the overall frequency response capability is used to describe the ability of the power system to change the overall frequency deviation under only one frequency regulation after the grid load changes due to the penetration of new energy;

[0009] The grid frequency response capability of the target power system is evaluated according to the target evaluation index to obtain an evaluation result.

[0010] According to another aspect of the present invention, a device for evaluating power grid frequency response capability is provided, the device comprising:

[0011] A power grid parameter signal acquisition module, configured to acquire power grid parameter signals of a target power system; wherein the target power system includes new energy sources;

[0012] a target evaluation index determination module, configured to determine at least one target evaluation index based on the grid parameter signal; wherein the target evaluation index includes an overall frequency response capability, which is used to describe the ability of the power system to change the overall frequency deviation under only one frequency regulation after the grid load changes under the penetration of new energy;

[0013] An evaluation module is used to evaluate the grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result.

[0014] According to another aspect of the present invention, an electronic device is provided, comprising:

[0015] at least one processor; and,

[0016] a memory communicatively connected to the at least one processor; wherein,

[0017] The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor so that the at least one processor can perform the method for evaluating the power grid frequency response capability according to any embodiment of the present invention.

[0018] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for evaluating the power grid frequency response capability according to any embodiment of the present invention when executed.

[0019] The technical solution of the embodiment of the present invention obtains a grid parameter signal of a target power system; wherein the target power system includes new energy; determines at least one target evaluation index based on the grid parameter signal; wherein the target evaluation index includes overall frequency response capability, which is used to describe the ability of the power system to change the overall frequency deviation under the action of only primary frequency regulation after the grid load changes under the penetration of new energy; and evaluates the grid frequency response capability of the target power system based on the target evaluation index to obtain an evaluation result. This technical solution, by establishing a power system performance evaluation index, can quickly and quantitatively evaluate the grid frequency response capability of a new power system under the penetration of new energy, which helps to improve the grid primary frequency regulation performance of the new power system.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a flow chart of a method for evaluating power grid frequency response capability according to the first embodiment of the present invention;

[0023] Figure 2 1 is a schematic diagram of a frequency regulation capability model of a power grid for synchronous motors operating in parallel according to a first embodiment of the present invention;

[0024] Figure 3 is a flow chart of a method for evaluating power grid frequency response capability provided according to a second embodiment of the present invention;

[0025] Figure 4 2 is a schematic structural diagram of a device for evaluating power grid frequency response capability according to a third embodiment of the present invention;

[0026] Figure 5 The present invention is a schematic structural diagram of an electronic device for implementing a method for evaluating the frequency response capability of a power grid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", "target", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Example 1

[0030] Figure 1 This is a flow chart of a method for evaluating the frequency response capability of a power grid provided in the first embodiment of the present invention. This embodiment is applicable to the situation where the frequency response capability of a power grid of a new power system with the penetration of new energy is quickly and quantitatively evaluated. The method can be executed by an evaluation device for the frequency response capability of a power grid. The evaluation device for the frequency response capability of a power grid can be implemented in the form of hardware and / or software. The evaluation device for the frequency response capability of a power grid can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0031] S110: Acquire a grid parameter signal of a target power system.

[0032] The target power system may refer to the power system for which the grid frequency response capability assessment is required. It should be noted that the target power system includes renewable energy, meaning it is a new type of power system incorporating renewable energy. For example, grid parameter signals may include, but are not limited to, load changes, generator speed, motor rotor speed, and the start and end times of primary grid frequency regulation.

[0033] S120: Determine at least one target evaluation index according to the power grid parameter signal.

[0034] Target evaluation indicators can be used to assess the grid frequency response capability of the target power system. These include overall frequency response capability, which describes the ability of the power system to change its overall frequency deviation under a single frequency regulation after a change in grid load due to renewable energy penetration. One or more target evaluation indicators can be selected flexibly based on the current grid operating status and acquired grid parameter signals.

[0035] In this embodiment, optionally, a method for determining the overall frequency response capability of the target power system includes: determining the grid frequency deviation change and grid load change of the target power system within a target time period under the action of primary frequency regulation; and determining the overall frequency response capability of the target power system based on the absolute value of the ratio of the grid frequency deviation change to the grid load change.

[0036] The target time period may refer to a period of time when the target power system is only in the primary frequency regulation mode (i.e., without the secondary frequency regulation mode). Due to the different total number of generators started by the power grid, the load changes of the power grid will be different. Based on this, the overall frequency response capability of the power grid can be characterized. For example, the overall frequency response capability R FRC Expressed as: The overall frequency response capability of the target power system can be quantitatively described based on the overall frequency response capability, and then the accuracy of the primary frequency regulation of the power grid can be judged.

[0037] Figure 2 This is a schematic diagram of a grid frequency regulation capability model for synchronous motors running in parallel according to the first embodiment of the present invention. i is the given value of secondary frequency modulation, δ i is the inequality rate of the i-th unit in the power grid; α i G is the installed capacity of the i-th unit in the power grid / installed capacity of the power system; i (s) is the transfer function of the i-th steam turbine; P NL (s) is the per-unit value of the load; is the per-unit value of the power grid frequency change; T ai is the rotor time constant of the i-th steam turbine; M is the number of synchronous generators; s represents the Lagrangian operator; T αΣ is the inertia time constant of the power grid. Figure 2 The model in can be calculated Under the action of only one frequency regulation, the grid frequency change can be deduced as According to the final value theorem, when s in the above formula is close to 0, the grid frequency changes It can be expressed as Therefore, the overall frequency response capability of the power grid can be expressed as

[0038] Among them, R FRC It can be equivalent to the overall frequency response capability of all grid-connected synchronous generators under the sum of the frequency regulation output. In addition, for the grid dispatching center, α i is known at any time, the formula The grid inertia time constant T αΣIt can be obtained by taking the weighted average of the rotor time constant of each unit. Since the generator rotor time constant is small, the value is relatively fixed. Among them G i (s) is the transfer function of the i-th steam turbine. According to the structure and control mode of the steam turbine put into operation in the power grid (which is known for power grid dispatching), the corresponding transfer function can be selected for calculation.

[0039] In this embodiment, optionally, the target evaluation index also includes dynamic continuous anti-disturbance, which includes dynamic continuous anti-high-frequency disturbance and dynamic continuous anti-low-frequency disturbance. Dynamic continuous anti-high-frequency disturbance is used to describe the ability of the group to reduce output when the grid frequency exceeds the upper limit of the dead zone, and dynamic continuous anti-low-frequency disturbance is used to describe the ability of the group to increase output when the grid frequency exceeds the lower limit of the dead zone.

[0040] It should be noted that generators are the primary frequency regulators for power grids, controlling grid frequency by adjusting their output power. When the grid frequency is excessively high, frequency regulation is necessary to maintain stable grid operation. Frequency regulation balances supply and demand by adjusting generator output power, bringing the grid frequency back within a normal range. Dynamic continuous anti-disturbance monitoring can provide the grid with an assessment of its frequency response capabilities under abnormal grid frequency conditions (high-frequency and low-frequency disturbances) during actual generator set operation.

[0041] In this embodiment, optionally, a method for determining the dynamic continuous resistance to high-frequency disturbances of the target power system includes: determining the cumulative actual power reduction of the unit and the cumulative power reduction required by the unit when the grid frequency of the target power system exceeds the dead zone upper limit preset number of times continuously; and determining the dynamic continuous resistance to high-frequency disturbances of the target power system based on the ratio of the cumulative actual power reduction of the unit to the cumulative power reduction required by the unit.

[0042] The preset number of times may refer to the number of times the grid frequency exceeds the upper limit of the dead zone continuously, which is preset according to the actual detection requirements, for example, 3 times. For example, taking the preset number of times as 3 as an example, the dynamic continuous anti-high frequency disturbance R ATHF Expressed as: Where M represents the number of units participating in frequency regulation, i represents the number of frequency regulation times, and j represents the jth unit. represents the strain power of the jth unit (here is the cumulative power reduction of the unit), represents the actual power change of the jth unit (here, the cumulative actual power reduction of the unit), t is the time, t i Indicates the starting time of the i-th frequency modulation, τ i Indicates the duration of the i-th frequency modulation.

[0043] In this embodiment, optionally, a method for determining the dynamic continuous resistance to low-frequency disturbances of the target power system includes: determining the cumulative actual power increase of the unit and the cumulative power increase of the unit when the grid frequency of the target power system exceeds the lower limit of the dead zone for a preset number of consecutive times; and determining the dynamic continuous resistance to low-frequency disturbances of the target power system based on the ratio of the cumulative actual power increase of the unit to the cumulative power increase of the unit.

[0044] For example, still taking the preset number of times as 3 as an example, the dynamic continuous anti-low frequency disturbance R ATLF Expressed as: Where M represents the number of units participating in frequency regulation, i represents the number of frequency regulation times, and j represents the jth unit. represents the strain power of the jth unit (here is the cumulative power increase of the unit), represents the actual power change of the jth unit (here, the cumulative actual power increase of the unit), t is the time, t i Indicates the starting time of the i-th frequency modulation, τ i Indicates the duration of the i-th frequency modulation.

[0045] In this embodiment, optionally, the target evaluation index also includes long-term continuous frequency regulation. Long-term continuous frequency regulation is used to describe the load changes of the power system when all frequency regulation units participate in frequency regulation for a long time. Long-term participation in frequency regulation means that the number of times of participating in frequency regulation within a preset time period is greater than or equal to the preset number of frequency regulation times; the method for determining the long-term continuous frequency regulation of the target power system includes: determining the actual variable load and strain load of the target power system in the target frequency regulation period; determining the long-term continuous frequency regulation of the target power system according to the ratio of the actual variable load to the strain load.

[0046] For example, the preset duration can be set to 1 hour, and the preset frequency modulation times can be set to 4 times. That is, if there are 4 or more frequency modulations within 1 hour, it can be considered as long-term participation in frequency modulation. Among them, the target frequency modulation period can refer to the time period corresponding to long-term participation in frequency modulation. For example, the long-term continuous frequency modulation R ATF Expressed as: Among them, N represents the number of frequency adjustments within one hour, M represents the number of units participating in the frequency adjustment, i represents the number of frequency adjustments, and j represents the jth unit. represents the strain power of the j-th unit, represents the actual power of the jth unit, t is the time, t i Indicates the starting time of the i-th frequency modulation, τ i represents the duration of the i-th frequency regulation. Based on long-term continuous frequency regulation, we can quantitatively evaluate the frequency response capability of the power grid by analyzing the overall load changes of the target power system when all frequency-regulated units participate in frequency regulation for a long time, thereby improving the primary frequency regulation performance of the power grid.

[0047] In this embodiment, optionally, the target evaluation index also includes an equivalent inertia coefficient, which is used to describe the ability of the synchronous motor inertia and the new energy unit inertia to resist frequency changes of the entire power system when the proportion of new energy unit access is higher than a preset proportion; the method for determining the equivalent inertia coefficient of the target power system includes: determining the rotational kinetic energy stored in the synchronous motor based on the rotational inertia and rotor angular velocity of the synchronous motor in the target power system; determining the virtual inertia coefficient of the new energy unit based on the active power difference of the new energy unit when a disturbance occurs in the target power system and the frequency change and rated power of the target power system; adding the ratio of the rotational kinetic energy stored in the synchronous motor to the rated capacity of the target power system to the virtual inertia coefficient of the new energy unit to obtain the equivalent inertia coefficient of the target power system.

[0048] Among them, the preset ratio can refer to the reference value of the ratio of new energy units connected to the target power system, which is pre-set according to actual detection needs. It should be noted that with the large-scale grid connection of new energy units and the widespread use of power electronic devices, the inertia sources of the power system are more abundant. In addition to the inherent rotational inertia of the system, the new energy units and temperature control loads connected to the grid through power electronic equipment can also be supported by inertia through additional control to achieve the effect of providing virtual inertia. Based on the above analysis of inertia sources, the equivalent inertia coefficient of the target power system can be expressed as: Among them, S sys is the rated capacity of the target power system, E rsg is the rotational kinetic energy stored in the synchronous motor, H ssg is the virtual inertia coefficient of the new energy unit. Based on the equivalent inertia coefficient, the inertia level of the new energy unit in the target power system can be quantified, the frequency response capability of the new energy unit can be determined, and the frequency modulation output of the new energy can be further quantitatively analyzed.

[0049] Furthermore, the rotational kinetic energy E stored in the synchronous motor rsg The calculation method is: Where N represents the number of synchronous motors connected to the grid and the number of energy storage units participating in primary frequency regulation, J i is the moment of inertia of the i-th synchronous motor, ω i is the angular velocity of the rotor of the i-th synchronous motor. The virtual inertia coefficient H of the new energy unit ssg It can be obtained by measurement based on the frequency monitoring data provided by the PMU measurement device and the active power difference of the new energy unit, which can be specifically expressed as: Where t represents time, the disturbance occurs at t = 0, ΔP ssg It represents the active power difference of the new energy unit when the disturbance occurs, Δf is the frequency change of the target power system, and the frequency f0 is the rated frequency of the target power system.

[0050] S130 , evaluating the grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result.

[0051] In this embodiment, after obtaining the target evaluation indicator, the grid frequency response capability of the target power system can be evaluated based on a pre-set indicator threshold or indicator interval and the target evaluation indicator, thereby obtaining an evaluation result. The indicator threshold and indicator interval may refer to the reference value and reference interval of the target evaluation indicator, respectively, and may serve as a basis for evaluating the grid frequency response capability.

[0052] Specifically, for the indicator threshold, each target evaluation indicator can be set with a corresponding indicator threshold. If the target evaluation indicator is greater than the corresponding indicator threshold, it can be considered that the grid frequency response capability is good; if the target evaluation indicator is less than or equal to the corresponding indicator threshold, it can be considered that the grid frequency response capability is poor. For example, taking the target evaluation indicator as the overall frequency response capability as an example, the indicator threshold corresponding to the overall frequency response capability of the grid under a single frequency regulation can be set according to the specific operating status of all units in the grid. If the overall frequency response capability of the target power system is greater than the corresponding indicator threshold, it can be considered that the grid frequency response capability is good; otherwise, it can be considered that the grid frequency response capability is poor.

[0053] For the indicator range, each target evaluation indicator can be set to a different indicator range. Different indicator ranges correspond to different levels of grid frequency response capability. Specifically, the larger the endpoint value (or average value) on the same side of each indicator range, the higher the level of grid frequency response capability (i.e., the better the grid frequency response capability).

[0054] In this embodiment, the established target evaluation indicators can quickly determine the dynamic continuous anti-disturbance capability of the target power system load, further identify the strength of the target power system grid frequency response capability, and determine whether the grid frequency response capability can meet the primary frequency regulation requirements, thereby obtaining a final evaluation result. Furthermore, after obtaining the evaluation results, corresponding recommendations can be manually given based on the evaluation results, and an evaluation report generated from the evaluation results and recommendations can be output to a storage device for backup storage. The evaluation report can also be output to a display device for display.

[0055] The technical solution of an embodiment of the present invention first obtains a grid parameter signal of a target power system, wherein the target power system includes renewable energy. Then, at least one target evaluation indicator is determined based on the grid parameter signal. The target evaluation indicator includes overall frequency response capability, which describes the ability of the power system to change its overall frequency deviation under primary frequency regulation alone after a change in grid load under renewable energy penetration. Finally, the grid frequency response capability of the target power system is evaluated based on the target evaluation indicator to obtain an evaluation result. By establishing power system performance evaluation indicators, this technical solution can quickly and quantitatively assess the grid frequency response capability of a new power system under renewable energy penetration, thereby helping to improve the primary frequency regulation performance of the new power system. Compared with existing technologies, this technical solution constructs a comprehensive multi-scale evaluation system that can quantitatively analyze the grid frequency response capability based on corresponding evaluation indicators for different grid operation scenarios, resulting in comprehensive, objective, and accurate evaluation results. It quantifies the dynamic continuous anti-disturbance capability of the new power system under renewable energy penetration and the inertia support level of the new energy generator units, providing data reference for stable grid operation and correct frequency regulation.

[0056] Example 2

[0057] Figure 3 This is a flowchart of a method for evaluating the power grid frequency response capability provided in Example 2 of the present invention. This embodiment is optimized based on the above embodiment. The specific optimization is as follows: evaluating the power grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result, including: if there are multiple target evaluation indicators, determining the weight value corresponding to each target evaluation indicator; determining the overall evaluation index according to the target evaluation index and the weight value corresponding to the target evaluation index; and evaluating the power grid frequency response capability of the target power system according to the overall evaluation index to obtain an evaluation result.

[0058] like Figure 3 As shown, the method of this embodiment specifically includes the following steps:

[0059] S210: Acquire a grid parameter signal of a target power system.

[0060] Among them, the target power system includes new energy.

[0061] S220: Determine multiple target evaluation indicators based on the power grid parameter signal.

[0062] Among them, the target evaluation indicators include at least two of the following: overall frequency response capability, dynamic continuous resistance to high-frequency disturbances, dynamic continuous resistance to low-frequency disturbances, long-term continuous frequency regulation and equivalent inertia coefficient.

[0063] S230: Determine the weight value corresponding to each target evaluation indicator.

[0064] The weight value can be used to represent the importance of the target evaluation indicator. Specifically, the larger the weight value, the more important the corresponding target evaluation indicator. The weight value corresponding to each target evaluation indicator can be a fixed value, pre-set based on actual detection experience.

[0065] S240: Determine an overall evaluation index based on the target evaluation index and the weight value corresponding to the target evaluation index.

[0066] Specifically, all target evaluation indicators can be weighted and summed according to each target evaluation indicator and its corresponding weight value, and the weighted sum result can be used as the overall evaluation indicator.

[0067] S250 , evaluating the grid frequency response capability of the target power system according to the overall evaluation index to obtain an evaluation result.

[0068] Among them, the specific implementation method of evaluating the grid frequency response capability of the target power system according to the overall evaluation index can refer to the process of evaluating the grid frequency response capability of the target power system according to the target evaluation index in the above-mentioned embodiment 1, and will not be repeated here.

[0069] The technical solution of an embodiment of the present invention, if there are multiple target evaluation indicators, determines a weight value corresponding to each target evaluation indicator; determines an overall evaluation indicator based on the target evaluation indicators and the weight values ​​corresponding to the target evaluation indicators; and evaluates the grid frequency response capability of the target power system based on the overall evaluation indicator to obtain an evaluation result. This technical solution can reflect the degree of influence of different target evaluation indicators on the grid frequency response capability by setting weights when there are multiple target evaluation indicators, and evaluate the grid frequency response capability based on the overall evaluation indicator, thereby obtaining a more accurate evaluation result.

[0070] Example 3

[0071] Figure 4 This is a schematic diagram of the structure of a power grid frequency response capability evaluation device provided by the third embodiment of the present invention. The device can execute the power grid frequency response capability evaluation method provided by any embodiment of the present invention and has the corresponding functional modules and beneficial effects of the execution method. Figure 4 As shown, the device includes:

[0072] The power grid parameter signal acquisition module 310 is used to acquire the power grid parameter signal of the target power system; wherein the target power system includes new energy sources;

[0073] a target evaluation index determination module 320, configured to determine at least one target evaluation index based on the grid parameter signal; wherein the target evaluation index includes an overall frequency response capability, which is used to describe the ability of the power system to change the overall frequency deviation under only one frequency regulation after the grid load changes due to the penetration of new energy;

[0074] The evaluation module 330 is configured to evaluate the grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result.

[0075] Optionally, the target evaluation index determination module 320 is configured to:

[0076] Determining a grid frequency deviation change and a grid load change of the target power system within a target time period under a primary frequency regulation;

[0077] The overall frequency response capability of the target power system is determined according to the absolute value of the ratio of the grid frequency deviation change to the grid load change.

[0078] Optionally, the target evaluation index also includes dynamic continuous anti-disturbance, which includes dynamic continuous anti-high-frequency disturbance and dynamic continuous anti-low-frequency disturbance. The dynamic continuous anti-high-frequency disturbance is used to describe the ability of the group to reduce output when the grid frequency exceeds the upper limit of the dead zone, and the dynamic continuous anti-low-frequency disturbance is used to describe the ability of the group to increase output when the grid frequency exceeds the lower limit of the dead zone.

[0079] Optionally, the target evaluation index determination module 320 is further configured to:

[0080] When the grid frequency of the target power system exceeds the upper limit of the dead zone for a consecutive number of times, determining the cumulative actual power reduction of the unit and the cumulative power reduction of the unit;

[0081] determining the dynamic continuous high-frequency disturbance resistance of the target power system according to the ratio of the cumulative actual power reduction of the units to the cumulative power reduction required of the units;

[0082] When the grid frequency of the target power system exceeds the lower limit of the dead zone for a preset number of times continuously, determining the cumulative actual power increase of the unit and the cumulative power increase of the unit;

[0083] The dynamic continuous low-frequency disturbance resistance of the target power system is determined according to the ratio of the cumulative actual power increase of the unit to the cumulative power increase required of the unit.

[0084] Optionally, the target evaluation indicator further includes long-term continuous frequency regulation, which is used to describe the load change of the power system when all frequency-regulating units participate in frequency regulation for a long time. Long-term participation in frequency regulation means that the number of times the frequency regulation is participated in within a preset time period is greater than or equal to a preset number of frequency regulation times.

[0085] The target evaluation index determination module 320 is further configured to:

[0086] Determining the actual variable load and the strain load of the target power system during the target frequency regulation period;

[0087] The long-term continuous frequency regulation of the target power system is determined according to the ratio of the actual variable load to the strain load.

[0088] Optionally, the target evaluation index further includes an equivalent inertia coefficient, which is used to describe the ability of the entire power system to resist frequency changes by coordinating the inertia of the synchronous motor and the inertia of the new energy units when the proportion of new energy units connected is higher than a preset proportion;

[0089] The target evaluation index determination module 320 is further configured to:

[0090] determining the rotational kinetic energy stored in the synchronous motor according to the moment of inertia and the rotor angular velocity of the synchronous motor in the target power system;

[0091] determining a virtual inertia coefficient of the new energy generator set according to the active power difference of the new energy generator set when a disturbance occurs in the target power system and the frequency change and rated power of the target power system;

[0092] The ratio of the rotational kinetic energy stored in the synchronous motor to the rated capacity of the target power system is added to the virtual inertia coefficient of the new energy generator set to obtain the equivalent inertia coefficient of the target power system.

[0093] Optionally, the evaluation module 330 is configured to:

[0094] If there are multiple target evaluation indicators, determine the weight value corresponding to each target evaluation indicator;

[0095] Determine the overall evaluation index based on the target evaluation index and the weight value corresponding to the target evaluation index;

[0096] The grid frequency response capability of the target power system is evaluated according to the overall evaluation index to obtain an evaluation result.

[0097] An evaluation device for power grid frequency response capability provided by an embodiment of the present invention can execute an evaluation method for power grid frequency response capability provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0098] Example 4

[0099] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0100] like Figure 5 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0101] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0102] Processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. Processor 11 executes the various methods and processes described above, such as the method for evaluating grid frequency response capability.

[0103] In some embodiments, the method for evaluating the grid frequency responsiveness can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for evaluating the grid frequency responsiveness described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the method for evaluating the grid frequency responsiveness via any other suitable means (e.g., via firmware).

[0104] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0105] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0106] In the context of the present invention, computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage medium can include but is not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage medium can be a machine-readable signal medium. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0107] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0108] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0109] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0110] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0111] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for evaluating power grid frequency response capability, characterized in that: The method comprises: Acquiring a power grid parameter signal of a target power system; wherein the target power system includes new energy; Determine at least one target evaluation index according to the grid parameter signal; wherein the target evaluation index includes an overall frequency response capability, and the overall frequency response capability is used to describe the ability of the power system to change the overall frequency deviation under only one frequency regulation after the grid load changes under the penetration of new energy; The power grid frequency response capability of the target power system is evaluated according to the target evaluation index to obtain an evaluation result.

2. The method according to claim 1, characterized in that: The method for determining the overall frequency response capability of the target power system includes: Determining a grid frequency deviation change and a grid load change of the target power system within a target time period under a primary frequency modulation action; The overall frequency response capability of the target power system is determined according to the absolute value of the ratio of the grid frequency deviation change to the grid load change.

3. The method according to claim 1, characterized in that The target evaluation index also includes dynamic continuous anti-disturbance, which includes dynamic continuous anti-high-frequency disturbance and dynamic continuous anti-low-frequency disturbance. The dynamic continuous anti-high-frequency disturbance is used to describe the ability of the unit to reduce output when the grid frequency exceeds the upper limit of the dead zone, and the dynamic continuous anti-low-frequency disturbance is used to describe the ability of the unit to increase output when the grid frequency exceeds the lower limit of the dead zone.

4. The method according to claim 3, characterized in that: The determination method of the dynamic continuous high-frequency disturbance resistance of the target power system includes: When the grid frequency of the target power system exceeds the upper limit of the dead zone for a preset number of times in a row, determining the cumulative actual power reduction of the unit and the cumulative power reduction of the unit; Determining the dynamic continuous high-frequency disturbance resistance of the target power system according to the ratio of the cumulative actual power reduction of the unit to the cumulative power reduction of the unit; The determination method of the dynamic continuous low-frequency disturbance resistance of the target power system includes: When the grid frequency of the target power system exceeds the lower limit of the dead zone for a preset number of times in a row, determining the cumulative actual power increase of the unit and the cumulative power increase that should be increased for the unit; The dynamic continuous low-frequency disturbance resistance of the target power system is determined according to the ratio of the accumulated actual power increase of the unit to the accumulated power increase required of the unit.

5. The method according to any one of claims 1 to 4, characterized in that The target evaluation index also includes long-term continuous frequency regulation, which is used to describe the load change of the power system when all frequency regulation units participate in frequency regulation for a long time. The long-term participation in frequency regulation means that the number of times participating in frequency regulation within a preset time is greater than or equal to the preset number of frequency regulation; The method for determining the long-term continuous frequency regulation of the target power system includes: Determining the actual variable load and the strain load of the target power system during the target frequency regulation period; The long-term continuous frequency regulation of the target power system is determined according to the ratio of the actual variable load to the strain load.

6. The method according to any one of claims 1 to 4, characterized in that The target evaluation index also includes an equivalent inertia coefficient, which is used to describe the ability of the entire power system to resist frequency changes by coordinating the inertia of the synchronous motor and the inertia of the new energy units when the proportion of new energy units connected is higher than a preset proportion; The method for determining the equivalent inertia coefficient of the target power system includes: Determining the rotational kinetic energy stored in the synchronous motor according to the rotational inertia and the rotor angular velocity of the synchronous motor in the target power system; Determine the virtual inertia coefficient of the new energy unit according to the active power difference of the new energy unit when the target power system is disturbed and the frequency change and rated power of the target power system; The ratio of the rotational kinetic energy stored in the synchronous motor to the rated capacity of the target power system is added to the virtual inertia coefficient of the new energy unit to obtain the equivalent inertia coefficient of the target power system.

7. The method according to claim 1, characterized in that The power grid frequency response capability of the target power system is evaluated according to the target evaluation index to obtain an evaluation result, including: If there are multiple target evaluation indicators, determine the weight value corresponding to each target evaluation indicator; Determine the overall evaluation index according to the target evaluation index and the weight value corresponding to the target evaluation index; The grid frequency response capability of the target power system is evaluated according to the overall evaluation index to obtain an evaluation result.

8. A device for evaluating power grid frequency response capability, characterized in that: The device comprises: A power grid parameter signal acquisition module, used to acquire a power grid parameter signal of a target power system; wherein the target power system includes new energy; A target evaluation index determination module is used to determine at least one target evaluation index according to the power grid parameter signal; wherein the target evaluation index includes an overall frequency response capability, and the overall frequency response capability is used to describe the ability of the power system to change the overall frequency deviation under only one frequency regulation after the power grid load changes under the penetration of new energy; An evaluation module is used to evaluate the power grid frequency response capability of the target power system according to the target evaluation index to obtain an evaluation result.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can perform the method for evaluating the frequency response capability of a power grid according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for evaluating the frequency response capability of a power grid according to any one of claims 1 to 7 when executed.

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