Distributed power frequency safety monitoring method, device and system

Abstract

The invention relates to a distributed power frequency safety monitoring method, device and system. The method comprises the following steps: under the condition of transient disturbance of a power system, sending a pre-generated virtual frequency track and a unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency track and the unit impulse response sequence based on a pre-established frequency control model, generating a plurality of virtual additional frequency trajectories, and sending the plurality of virtual additional frequency trajectories to a power grid side; generating frequency response information based on a pre-acquired net disturbance trajectory and a plurality of virtual additional frequency trajectories; performing security detection on the frequency response information based on pre-acquired frequency deviation information to obtain a security detection result of the power system; wherein the safety detection result is used for representing whether the power system has a transient frequency response out-of-limit risk or not. The method can improve the frequency safety detection efficiency of the power system.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and particularly to a distributed power frequency safety monitoring method, device, and system. Background Art

[0002] To promote green and sustainable development, new energy power generation is being actively promoted and connected to the grid around the world. However, as traditional synchronous generators are gradually replaced by new energy power generation equipment, the rotational inertia, regulation ability, disturbance resistance, and robustness in the power system are continuously decreasing. This poses a severe challenge to the frequency safety of the power system.

[0003] In traditional technologies, the dynamic characteristics of the power system are usually collected by a central computing device and simulated and analyzed to evaluate whether the frequency of the power system is within a safe range.

[0004] However, with the increasing proportion of new energy, traditional methods have the problem of low efficiency in detecting whether the frequency of the power system is safe. Summary of the Invention

[0005] Based on this, it is necessary to provide a distributed power frequency safety monitoring method, device, and system that can improve the efficiency of power system frequency safety detection for the above technical problems.

[0006] In a first aspect, the present application provides a distributed power frequency safety monitoring method, which is applied to the grid side. The method includes:

[0007] In the case of a transient disturbance in the power system, sending a pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on a pre-established frequency control model to generate multiple virtual additional frequency trajectories, and sending the multiple virtual additional frequency trajectories to the grid side;

[0008] Generating frequency response information based on a pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories;

[0009] Performing a safety detection on the frequency response information based on pre-obtained frequency deviation information to obtain a safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0010] In one embodiment, the frequency response information includes a frequency response value, and the frequency deviation information includes a frequency deviation value. The above-mentioned performing a safety detection on the frequency response information based on pre-obtained frequency deviation information to obtain a safety detection result of the power system includes:

[0011] When the frequency response value is less than the frequency deviation value, it is determined that the safety detection result is that there is a risk of transient frequency response exceeding the limit in the power system.

[0012] In one embodiment, the generation process of the above virtual frequency trajectory includes:

[0013] Obtain the disturbance amplitude and frequency deviation information of the power system;

[0014] Generate a virtual frequency trajectory based on the disturbance amplitude and the frequency deviation information.

[0015] In one embodiment, the generation process of the above unit impulse response sequence includes:

[0016] Obtain the equivalent inertia and equivalent damping;

[0017] Generate a unit impulse response sequence based on the equivalent inertia and equivalent damping.

[0018] In one embodiment, the generation process of the above net disturbance trajectory includes:

[0019] Obtain the disturbance amplitude of the power system;

[0020] Generate a net disturbance trajectory based on the unit impulse response sequence and the disturbance amplitude of the power system.

[0021] In a second aspect, the present application provides a distributed power frequency safety monitoring method, which is applied to a frequency modulation device. The method includes:

[0022] Obtain the virtual frequency trajectory and the unit impulse response sequence sent by the grid side;

[0023] Process the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and send the plurality of virtual additional frequency trajectories to the grid side, so that the grid side generates frequency response information based on the pre-obtained net disturbance trajectory and the plurality of virtual additional frequency trajectories; perform safety detection on the frequency response information based on the pre-obtained frequency deviation information to obtain the safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

[0024] In one embodiment, the process of processing the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories includes:

[0025] Perform integral processing on the virtual frequency trajectory to obtain the virtual active output power;

[0026] Convolve the virtual active power output and the unit impulse response sequence to obtain the virtual additional frequency trajectory.

[0027] In a third aspect, the present application also provides a distributed power frequency safety monitoring device, which is applied to the grid side. The device includes:

[0028] A sending module, configured to send the pre-generated virtual frequency trajectory and the unit impulse response sequence to each frequency modulation device in the case of a transient disturbance in the power system, so that each frequency modulation device processes the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate multiple virtual additional frequency trajectories, and sends the multiple virtual additional frequency trajectories to the grid side;

[0029] A generating module, configured to generate frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories;

[0030] A safety detection module, configured to perform safety detection on the pre-obtained frequency response information to obtain a safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0031] In a fourth aspect, the present application also provides a distributed power frequency safety monitoring device, which is applied to a frequency modulation device. The device includes:

[0032] An obtaining module, configured to obtain the virtual frequency trajectory and the unit impulse response sequence sent by the grid side;

[0033] A processing module, configured to process the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side, so that the grid side generates frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories; perform safety detection on the frequency response information based on the pre-obtained frequency deviation information to obtain a safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0034] In a fifth aspect, the present application also provides a distributed power frequency safety monitoring system, which includes a grid side and multiple frequency modulation devices;

[0035] The grid side is configured to execute the method of the first aspect;

[0036] Multiple frequency modulation devices are configured to execute the method of the second aspect.

[0037] Sixth aspect, the present application also provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0038] In the case of a transient disturbance occurring in the power system, send the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side;

[0039] Generate frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories;

[0040] Perform a security detection on the frequency response information based on the pre-obtained frequency deviation information to obtain a security detection result of the power system; where the security detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0041] Seventh aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0042] In the case of a transient disturbance occurring in the power system, send the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side;

[0043] Generate frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories;

[0044] Perform a security detection on the frequency response information based on the pre-obtained frequency deviation information to obtain a security detection result of the power system; where the security detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0045] Eighth aspect, the present application also provides a computer program product, including a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0046] In the case of a transient disturbance occurring in the power system, send the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side;

[0047] Generate frequency response information based on pre-acquired net disturbance trajectories and multiple virtual additional frequency trajectories;

[0048] Perform security detection on the frequency response information based on pre-acquired frequency deviation information to obtain the security detection result of the power system; wherein, the security detection result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

[0049] In the above distributed power frequency security monitoring method, device and system, when a transient disturbance occurs in the power system, the grid side sends pre-generated virtual frequency trajectories and unit impulse response sequences to each frequency modulation device, so that they can process the virtual frequency trajectories and unit impulse response sequences according to the pre-established frequency control model, generate multiple virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side. Subsequently, the grid side generates frequency response information based on the pre-acquired net disturbance trajectories and multiple virtual additional frequency trajectories, and obtains the security detection result of the power system by performing security detection on the pre-acquired frequency deviation information. The security detection result is used to determine whether there is a risk of transient frequency response exceeding the limit in the power system. In this method, the grid side distributes the virtual frequency trajectories and unit impulse response sequences to multiple frequency modulation devices, and uses their distributed computing capabilities to process the frequency trajectories, realizing a parallel computing method. This distributed processing can significantly shorten the generation time of frequency response information, improve the real-time response ability of the power system to frequency disturbances, and thus greatly improve the efficiency of security detection. Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0051] Figure 1 It is a structural diagram of a distributed power frequency security monitoring system in an embodiment;

[0052] Figure 2 It is a flowchart of a distributed power frequency security monitoring method in an embodiment;

[0053] Figure 3 It is a flowchart of a distributed power frequency security monitoring method in another embodiment;

[0054] Figure 4 It is a flowchart of a distributed power frequency security monitoring method in another embodiment;

[0055] Figure 5 Schematic diagram of the process of a distributed power frequency safety monitoring method in another embodiment;

[0056] Figure 6 Schematic diagram of the process of a distributed power frequency safety monitoring method in another embodiment;

[0057] Figure 7 Schematic diagram of the process of a distributed power frequency safety monitoring method in another embodiment;

[0058] Figure 8 Comparison chart of the calculation time consumption between the existing centralized method and the distributed algorithm in the embodiment of the present application;

[0059] Figure 9 Comparison chart of the analysis results between the existing centralized method and the distributed algorithm in the embodiment of the present application;

[0060] Figure 10 Structure block diagram of a distributed power frequency safety monitoring device in an embodiment;

[0061] Figure 11 Structure block diagram of a distributed power frequency safety monitoring device in another embodiment;

[0062] Figure 12 Internal structure diagram of a computer device in an embodiment;

[0063] Explanation of reference numerals:

[0064] Grid side 10, frequency modulation device 11. Detailed implementation manners

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0066] In order to achieve green and sustainable development, the process of integrating new energy power generation into the power grid is being actively promoted around the world. As synchronous generators in the power system are continuously replaced, the rotational inertia, regulation ability, anti-interference ability and robustness in the power system are all deteriorating, and the safe and stable operation of the power system is facing severe challenges. Of particular concern is the frequency safety issue of the power system.

[0067] It has been realized that in a new power system, equipping power electronic power sources such as new energy power generation and energy storage with additional frequency control is the only way to maintain the frequency security of the future power system. However, the single capacity of power electronic power sources is small. In order to provide the power supply capacity matching that of a single synchronous generator, the number of power electronic power sources required is often on the order of 10^3 to 10^4, which will lead to a sharp increase in the number of devices participating in frequency regulation in the future power system. On the other hand, compared with traditional synchronous generators, the control of power electronic power sources is more flexible and can adopt different additional frequency control strategies according to the preferences of the affiliated entities, which will result in different control strategies for the devices participating in frequency regulation in the future power system, making it difficult to aggregate the impact of the devices on the system frequency security.

[0068] With the advancement of the low-carbon transformation process of the power system, the characteristics of the devices participating in power system frequency regulation, such as massive scale and dynamic heterogeneity, will become more prominent, which will lead to the risk of numerical explosion in the frequency security verification of the power system.

[0069] In traditional technologies, a centralized method is mainly used to complete the safety verification of the primary power system transient frequency response. The calculation model of the existing centralized method can be shown by formula (1):

[0070]

[0071] Among them, H S The corresponding expression is the equivalent swing equation reflecting the change of the power system frequency due to active power imbalance; H G,i The corresponding expression is the dynamics reflecting the change of the power injected into the power system by each dynamic device participating in frequency regulation in the power system due to frequency deviation. ω represents the deviation value (per unit value) between the actual frequency and the rated frequency of the power system; represents the additional active power (per unit value) injected into the power system by the i-th dynamic device participating in frequency regulation in the power system; r represents the instantaneous active power imbalance in the power system (per unit value); m is the aggregated equivalent inertia time constant of the power system, mainly provided by the rotational inertia of synchronous generators, with the unit of seconds; d is the aggregated equivalent damping coefficient of the power system, mainly provided by the frequency effect of the load in the system (per unit value); N G represents the set composed of all dynamic devices participating in frequency regulation in the power system. For the frequency modulation dynamics of each device in the system, because there are various types of devices included in the power grid and diverse additional frequency control strategies are equipped, a general state-space expression form such as H G,i is adopted to describe its dynamics. Among them, x i is the state variable in the state space corresponding to the dynamics of the i-th device participating in frequency regulation, f i and gi They are the corresponding state equation and output equation respectively.

[0072] Since step disturbances often have the most serious impact on the frequency performance of the power system, the embodiments of this application mainly consider the scenario where the instantaneous power imbalance r in the power system is a step power increase, that is, r(t)=-ΔP·u(t), where u(t) is the unit step function and ΔP is the disturbance amplitude.

[0073] To solve the above problems, the embodiments of this application propose a distributed power frequency safety monitoring scheme, which includes: when a transient disturbance occurs in the power system, the grid side sends the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that they can process the virtual frequency trajectory and unit impulse response sequence according to the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side. Subsequently, the grid side generates frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories, and obtains the safety detection result of the power system by performing safety detection on the pre-obtained frequency deviation information. The safety detection result is used to judge whether there is a risk of transient frequency response over-limit in the power system. In this method, the grid side distributes the virtual frequency trajectory and unit impulse response sequence to multiple frequency modulation devices, and uses their distributed computing capabilities to process the frequency trajectory, realizing a parallel computing method. This distributed processing can significantly shorten the generation time of frequency response information, improve the real-time response ability of the power system to frequency disturbances, and thus greatly improve the efficiency of safety detection.

[0074] The distributed power frequency safety monitoring method provided by the embodiments of this application can be applied to Figure 1 the distributed power frequency safety monitoring system as shown. The system includes a grid side 10 and multiple frequency modulation devices 11. When a transient disturbance occurs in the power system, the grid side 10 sends the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device 11, so that they can process the virtual frequency trajectory and unit impulse response sequence according to the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side 10. Subsequently, the grid side 10 generates frequency response information based on the pre-obtained net disturbance trajectory and multiple virtual additional frequency trajectories, and obtains the safety detection result of the power system by performing safety detection on the pre-obtained frequency deviation information. The safety detection result is used to judge whether there is a risk of transient frequency response over-limit in the power system. Among them, the frequency modulation device 11 refers to a device with frequency regulation ability in the power system, including synchronous generators, new energy power generation devices equipped with additional frequency control, energy storage systems, etc.

[0075] In an exemplary embodiment, as Figure 2 shown, a distributed power frequency safety monitoring method is provided. Taking the power grid side in Figure 1 as an example, the method includes the following steps 201 to 203. Among them:

[0076] Step 201, in the case of a transient disturbance occurring in the power system, send the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model, generates multiple virtual additional frequency trajectories, and sends the multiple virtual additional frequency trajectories to the power grid side.

[0077] Among them, a transient disturbance is a phenomenon in which, during the operation of the power system, due to various sudden factors, the operating state of the power system changes sharply in a short period of time. These sudden factors include, but are not limited to, short-circuit faults, generator tripping, load mutations, etc. Transient disturbances will cause the active power and reactive power imbalances in the power system, and then lead to fluctuations in electrical quantities such as the system voltage and frequency, posing a threat to the safe and stable operation of the power system.

[0078] The unit impulse response sequence reflects the time-domain response of the power system under the action of a unit impulse signal, that is, the natural response mode of the power system to an instantaneous disturbance without any additional frequency control.

[0079] The frequency control model is a mathematical model used inside the frequency modulation device to describe its frequency regulation behavior. Different types of frequency modulation devices have different frequency control models, and the frequency control model is constructed based on the characteristics and control strategies of the frequency modulation device itself. For example, the frequency control model of a synchronous generator is usually constructed based on the characteristics of its speed regulation system, while the frequency control model of new energy power generation equipment is constructed based on the control strategy of its power electronic converter. During the safety verification process of the transient frequency response of a distributed power system, the frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on its own frequency control model to generate a virtual additional frequency trajectory.

[0080] The virtual additional frequency trajectory is a trajectory of frequency changing with time generated by the frequency modulation device based on the virtual frequency trajectory and unit impulse response sequence and calculated through its own frequency control model. It reflects the additional influence of the frequency modulation device on the power system frequency under the virtual frequency trajectory, that is, in addition to the natural response (net disturbance trajectory) of the power system itself, the contribution made by the frequency modulation device to the change in the power system frequency. Multiple virtual additional frequency trajectories will be sent to the power grid side for generating frequency response information and performing safety detection.

[0081] In the embodiments of the present application, in the case of a transient disturbance occurring in the power system, the grid side can generate a preset virtual frequency trajectory based on the operating state of the power system. Then, a unit impulse response sequence can be generated through the dynamic model of the grid side (such as the transfer function of the grid).

[0082] Next, the grid side sends the generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device. Each frequency modulation device processes the received virtual frequency trajectory and unit impulse response sequence according to a preset frequency control model. Among them, the frequency control model of the frequency modulation device can be based on PID control, model predictive control, or other intelligent control algorithms.

[0083] During this process, the frequency modulation device generates multiple virtual additional frequency trajectories according to the virtual frequency trajectory, the unit impulse response sequence, and its own control model. Then, the frequency modulation device feeds back the multiple virtual additional frequency trajectories it generates to the grid side.

[0084] In some embodiments, the frequency control model can be as shown in formula (1):

[0085]

[0086] In formula (2), H G,i is the expression of the frequency control model, α i is the frequency regulation intensity of each frequency modulation device, τ i is the frequency regulation speed (time constant) of each frequency modulation device, N G is the number of frequency control models, x i 、 is the virtual active output power, and ω is the frequency of the power system.

[0087] α i takes values uniformly distributed in the interval [5, 15], that is, α i ~U(5, 15); τ i takes values uniformly distributed in the interval [7, 13], that is, τ i ~U(7, 13).

[0088] Step 202: Generate frequency response information based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories.

[0089] Among them, the net disturbance trajectory refers to the frequency response of the system without additional frequency control when facing a disturbance with a preset disturbance amplitude. The net disturbance trajectory reflects the frequency change of the system when there is only power disturbance and no additional frequency control action.

[0090] The frequency response information is comprehensive information about the system frequency response generated by the grid side based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories. It comprehensively considers the natural response of the power system itself (net disturbance trajectory) and the additional influence of each frequency modulation device on the system frequency (virtual additional frequency trajectory), thus being closer to the true frequency response of the power system. The frequency response information is an important basis for safety detection. By performing safety detection on it, it can be determined whether there is a risk of transient frequency response exceeding the limit in the power system.

[0091] In the embodiment of the present application, the grid side obtains the net disturbance trajectory by monitoring various disturbances in the power system and combining the real-time data of the grid. Then, the grid side generates the frequency response information based on the net disturbance trajectory and multiple virtual additional frequency trajectories obtained from each frequency modulation device. Among them, the frequency response information may include:

[0092] (1) The amplitude of frequency change: The amplitude of frequency fluctuation after the disturbance occurs.

[0093] (2) The frequency recovery time: The time from the occurrence of the disturbance to the recovery of the grid to the stable frequency.

[0094] (3) The frequency overlimit situation: If the frequency of the power grid system exceeds the predetermined safety limit value, this situation will be recorded.

[0095] Step 203, perform safety detection on the frequency response information based on the pre-acquired frequency deviation information to obtain the safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

[0096] Among them, the frequency deviation information (Standardized Frequency Deviation, SAF) is a key standard for the frequency response of the power system, and is used to characterize the degree to which the frequency of the power system deviates from the target value after a disturbance occurs. If the frequency deviation exceeds the allowable range of the system (such as ±0.5Hz or ±1Hz), it may lead to the instability of the power system.

[0097] Safety detection refers to the process of checking the frequency response information based on the pre-acquired frequency deviation information. The purpose of safety detection is to determine whether the system frequency reflected by the frequency response information meets the safety requirements, that is, whether there is a risk of transient frequency response exceeding the limit. If the frequency in the frequency response information does not exceed the maximum frequency deviation allowed by the system at any time, the power system is safe; otherwise, the power system has a risk of transient frequency response exceeding the limit.

[0098] In the embodiments of the present application, the grid side performs a security detection on the frequency response information based on the pre-acquired frequency deviation information, so as to determine whether the power system can return to the safe frequency range after a disturbance.

[0099] In some embodiments, first, the grid side detects whether the frequency deviation exceeds a predetermined safety limit. Then, it evaluates the recovery time of the power system and the duration of the frequency fluctuation. If this information exceeds the controllable range of the system, the power system is regarded as having a risk of transient frequency response over-limit.

[0100] Based on these analyses, the grid side generates a final security detection result indicating whether the power system has an over-limit risk. If a frequency deviation over-limit or an excessively long recovery time is detected, a risk warning will be issued, indicating that there is a potential problem of frequency instability in the power system. According to the detection result, the grid dispatcher can take corresponding countermeasures, such as adjusting the output power of the frequency modulation equipment, enabling the standby power supply, or starting the energy storage system, to help the power system quickly return to stability.

[0101] In the above-mentioned distributed power frequency security monitoring method, when a transient disturbance occurs in the power system, the grid side sends the pre-generated virtual frequency trajectory and the unit impulse response sequence to each frequency modulation device, so that they can process the virtual frequency trajectory and the unit impulse response sequence according to the pre-established frequency control model, generate multiple virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side. Subsequently, the grid side generates frequency response information based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories, and obtains the security detection result of the power system by performing a security detection on the pre-acquired frequency deviation information. The security detection result is used to determine whether the power system has a risk of transient frequency response over-limit. In this method, the grid side distributes the virtual frequency trajectory and the unit impulse response sequence to multiple frequency modulation devices, and uses their distributed computing capabilities to process the frequency trajectory, realizing a parallel computing method. This distributed processing can significantly shorten the generation time of the frequency response information, improve the real-time response ability of the power system to frequency disturbances, and thus greatly improve the efficiency of the security detection.

[0102] In an exemplary embodiment, the frequency response information includes a frequency response value, and the frequency deviation information includes a frequency deviation value. On this basis, "performing a security detection on the frequency response information based on the pre-acquired frequency deviation information to obtain the security detection result of the power system" in the above embodiment includes:

[0103] When the frequency response value is less than the frequency deviation value, it is determined that the security detection result is that the power system has a risk of transient frequency response over-limit.

[0104] In the embodiments of the present application, the obtained frequency response value and frequency deviation value are directly compared. According to the difference between the frequency response value and the frequency deviation value, the risk of transient frequency response exceeding the limit is evaluated. If the frequency response value is significantly lower than the frequency deviation value, it indicates that the adjustment ability of the power system cannot meet the requirements of frequency recovery, and the power system is in a state of high instability risk. At this time, the power system cannot adjust the frequency to the normal range, and the recovery process may take a longer time, or even may lead to continuous frequency fluctuations.

[0105] In the above embodiments, by comparing the frequency response value and the frequency deviation value, it is evaluated whether there is a risk of transient frequency response exceeding the limit in the power system. When the frequency response value is less than the frequency deviation value, it means that the power system fails to effectively recover to the safe frequency range, or the recovery speed is slow, and there is a risk of frequency instability. Through this safety detection method, the deficiencies in the frequency recovery of the power system can be quickly identified, and the risk of transient frequency response exceeding the limit can be warned in advance. In this way, adjustment measures can be taken in time to avoid potential system instability or large-scale frequency fluctuations, and ensure the frequency safety of the power grid.

[0106] In an exemplary embodiment, as Figure 3 shown, the generation process of the "virtual frequency trajectory" in the above embodiments includes:

[0107] Step 301, obtain the disturbance amplitude and frequency deviation information of the power system.

[0108] Among them, the disturbance amplitude refers to the magnitude of the change in the active power of the power system caused by various interference factors in the power system.

[0109] In the embodiments of the present application, the grid side obtains the disturbance amplitude and frequency deviation information of the power system.

[0110] Step 302, generate a virtual frequency trajectory based on the disturbance amplitude and frequency deviation information.

[0111] In the embodiments of the present application, the grid side determines the initial function form of the virtual frequency trajectory according to the power system theory and relevant mathematical models. Then, using the obtained disturbance amplitude and frequency deviation information, the parameters in the virtual frequency trajectory function are calculated through mathematical formulas and algorithms. Finally, the calculated parameters are substituted into the determined virtual frequency trajectory function form to generate the virtual frequency trajectory.

[0112] In the above embodiments, by obtaining the disturbance amplitude and frequency deviation information of the power system, the generation process of the virtual frequency trajectory can fully reflect the actual operating conditions of the power system. The disturbance amplitude characterizes the magnitude of the external shock or load fluctuation encountered by the power system, while the frequency deviation information can reflect the degree to which the power system deviates from the normal frequency after the disturbance. Using them as input data to generate the virtual frequency trajectory can significantly improve the accuracy of frequency prediction, thereby more accurately evaluating the frequency response ability of the power system.

[0113] In an exemplary embodiment, as Figure 4 shown, the generation process of the "unit impulse response sequence" in the above embodiments includes:

[0114] Step 401, obtain the equivalent inertia and equivalent damping.

[0115] Among them, the equivalent inertia is a comprehensive equivalent representation of the rotational inertia of all synchronous generators in the power system. In the power system, the rotating components of synchronous generators have inertia. When the active power of the power system changes, due to the existence of this inertia, the rotational speed of the generator will not change immediately, thus playing a buffering and resisting role in the change of the power system frequency. The equivalent inertia reflects the ability of the overall power system to resist the change of frequency due to the inertia of the rotating components when facing power disturbances.

[0116] The equivalent damping characterizes the inhibitory effect of the load on the frequency change during the frequency change process of the power system. When the power system frequency changes, the load will absorb or release energy according to its own frequency characteristics, thus playing a damping role in the frequency change.

[0117] In the embodiments of the present application, the grid side obtains the equivalent inertia and equivalent damping.

[0118] Step 402, generate a unit impulse response sequence based on the equivalent inertia and the equivalent damping.

[0119] In the embodiments of the present application, the grid side generates a unit impulse response sequence based on the equivalent inertia and the equivalent damping.

[0120] In some embodiments, the unit impulse response sequence is as shown in formula (2):

[0121]

[0122] In formula (3), h 0 (t) is the unit impulse response sequence, L -1 (s) represents the inverse Laplace transform, m is the equivalent inertia, and d is the equivalent damping.

[0123] In the above embodiments, generating the unit impulse response sequence based on the equivalent inertia and equivalent damping helps to accurately simulate the dynamic response of the power system after a disturbance, thereby more precisely evaluating the stability of the power system.

[0124] In an exemplary embodiment, as Figure 5 shown, the generation process of the "net disturbance trajectory" in the above embodiments includes:

[0125] Step 501, obtaining the disturbance amplitude of the power system.

[0126] In the embodiments of the present application, the grid side obtains the disturbance amplitude of the power system.

[0127] Step 502, generating a net disturbance trajectory based on the unit impulse response sequence and the disturbance amplitude of the power system.

[0128] In the embodiments of the present application, the grid side generates a net disturbance trajectory based on the unit impulse response sequence and the disturbance amplitude of the power system.

[0129] In some embodiments, the net disturbance trajectory can be shown by formula (3):

[0130]

[0131] In formula (4), ω 0 (t) is the net disturbance trajectory, L -1 (s) represents the inverse Laplace transform, m is the equivalent inertia, d is the equivalent damping, and ΔP is the disturbance amplitude.

[0132] Exemplarily, if the frequency safety requirement of the power system is that "when the power system suffers a 4.607% active power disturbance, the frequency deviation information of the power system does not exceed ±0.5 Hz", that is, ΔP = 0.0460692 and the frequency deviation value = -0.01, then the virtual frequency trajectory can be shown by formula (4):

[0133]

[0134] wherein, is the virtual frequency trajectory that meets the frequency safety requirement.

[0135] In the above embodiments, by combining the unit impulse response sequence and the disturbance amplitude to generate the net disturbance trajectory, the actual impact of the disturbance on the power system can be more precisely evaluated.

[0136] In an exemplary embodiment, as Figure 6 shown, a distributed power frequency safety monitoring method is provided, and this method is applied to Figure 1Taking the frequency modulation device in [ID] as an example, the following steps 601 to 602 are included. Among them:

[0137] Step 601, obtain the virtual frequency trajectory and the unit impulse response sequence sent by the grid side.

[0138] In the embodiment of the present application, in the case of a transient disturbance in the power system, the grid side can generate a preset virtual frequency trajectory based on the working state of the power system. Then, a unit impulse response sequence can be generated through the dynamic model of the grid side (such as the transfer function of the grid).

[0139] Next, the grid side sends the generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device. The frequency modulation device obtains the virtual frequency trajectory and unit impulse response sequence sent by the grid side.

[0140] Step 602, process the virtual frequency trajectory and the unit impulse response sequence based on the pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side, so that the grid side generates frequency response information based on the pre-obtained net disturbance trajectory and the multiple virtual additional frequency trajectories; perform a safety detection on the frequency response information based on the pre-obtained frequency deviation information to obtain a safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0141] In the embodiment of the present application, each frequency modulation device processes the received virtual frequency trajectory and unit impulse response sequence according to the pre-set frequency control model. Among them, the frequency control model of the frequency modulation device can be based on PID control, model predictive control or other intelligent control algorithms.

[0142] During this process, the frequency modulation device generates multiple virtual additional frequency trajectories according to the virtual frequency trajectory, the unit impulse response sequence and its own control model. Then, the frequency modulation device feeds back the multiple virtual additional frequency trajectories it generates to the grid side.

[0143] The grid side obtains the net disturbance trajectory by monitoring various disturbances in the power system and combining the real-time data of the grid. Then, the grid side generates frequency response information based on the net disturbance trajectory and the multiple virtual additional frequency trajectories obtained from each frequency modulation device. Among them, the frequency response information may include:

[0144] (1) The amplitude of frequency change: the amplitude of frequency fluctuation after the disturbance occurs.

[0145] (2) The frequency recovery time: the time from the occurrence of the disturbance to the recovery of the grid to the stable frequency.

[0146] (3) Frequency overlimit situation: If the power grid system frequency exceeds a predetermined safety limit, this situation will be recorded.

[0147] The grid side performs a safety detection on the frequency response information based on the pre-acquired frequency deviation information, so as to determine whether the power system can return to the safe frequency range after a disturbance.

[0148] In some embodiments, first, the grid side detects whether the frequency deviation exceeds a predetermined safety limit. Then, it evaluates the recovery time of the power system and the duration of the frequency fluctuation. If this information exceeds the controllable range of the system, the power system is regarded as having a risk of transient frequency response overlimit.

[0149] Based on these analyses, the grid side generates a final safety detection result, indicating whether the power system has an overlimit risk. If a frequency deviation overlimit or an overly long recovery time is detected, a risk warning will be issued, indicating that there is a potential problem of frequency instability in the power system. According to the detection result, grid dispatchers can take corresponding countermeasures, such as adjusting the output power of frequency modulation equipment, enabling standby power supplies, or starting energy storage systems, to help the power system quickly return to stability.

[0150] In the above distributed power frequency safety monitoring method, when a transient disturbance occurs in the power system, the grid side sends the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that they can process the virtual frequency trajectory and unit impulse response sequence according to the pre-established frequency control model, generate multiple virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side. Subsequently, the grid side generates frequency response information based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories, and obtains the safety detection result of the power system through a safety detection of the pre-acquired frequency deviation information. The safety detection result is used to determine whether the power system has a risk of transient frequency response overlimit. In this method, the grid side distributes the virtual frequency trajectory and unit impulse response sequence to multiple frequency modulation devices, and uses their distributed computing capabilities to process the frequency trajectory, realizing a parallel computing method. This distributed processing can significantly shorten the generation time of frequency response information, improve the real-time response ability of the power system to frequency disturbances, and thus greatly improve the efficiency of safety detection.

[0151] In an exemplary embodiment, as Figure 7 shown, the above embodiment of "processing the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model to generate multiple virtual additional frequency trajectories" includes:

[0152] Step 701, perform an integration process on the virtual frequency trajectory to obtain the virtual active output power.

[0153] In the embodiment of the present application, the frequency modulation device performs integral processing on the virtual frequency trajectory according to its own frequency control model to obtain the virtual active output power.

[0154] It should be noted that the frequency modulation device performing integral processing on the virtual frequency trajectory according to its own frequency control model is actually converting the frequency change information into the corresponding power demand. In the power system, the frequency change is usually related to the power imbalance. The greater the frequency deviation, the greater the power that the power system needs to adjust.

[0155] Step 702: Convolve the virtual active output power and the unit impulse response sequence to obtain the virtual additional frequency trajectory.

[0156] In the embodiment of the present application, in the frequency modulation device, convolving the virtual active output power and the unit impulse response sequence is essentially obtaining the virtual additional frequency trajectory by performing weighted averaging on these two signals. The frequency modulation device will use its frequency control model to perform combined processing on the virtual active output power and the unit impulse response sequence. During the convolution process, the frequency modulation device gradually combines the virtual active output power with the unit impulse response sequence to obtain the virtual additional frequency trajectory.

[0157] In the above embodiment, the frequency modulation device can monitor the virtual additional frequency trajectory to be able to quickly restore stability after a transient disturbance occurs in the power system and reduce the risk of frequency overrun.

[0158] Some embodiments of the present application provide a distributed power frequency safety monitoring method, which may include the following steps:

[0159] Step 1: When a transient disturbance occurs in the power system, the grid side obtains the disturbance amplitude and frequency deviation information of the power system.

[0160] Step 2: The grid side generates a virtual frequency trajectory based on the disturbance amplitude and the frequency deviation information.

[0161] Step 3: The grid side obtains the equivalent inertia and equivalent damping.

[0162] Step 4: The grid side generates a unit impulse response sequence based on the equivalent inertia and equivalent damping.

[0163] Step 5: The grid side obtains the disturbance amplitude of the power system.

[0164] Step 6: The grid side generates a net disturbance trajectory based on the unit impulse response sequence and the disturbance amplitude of the power system.

[0165] Step 7: The grid side sends the generated virtual frequency trajectory and the unit impulse response sequence to each frequency modulation device.

[0166] Step 8, the frequency modulation device obtains the virtual frequency trajectory and the unit impulse response sequence sent by the grid side.

[0167] Step 9, the frequency modulation device integrates the virtual frequency trajectory to obtain the virtual active output power.

[0168] Step 10, the frequency modulation device convolves the virtual active output power and the unit impulse response sequence to obtain the virtual additional frequency trajectory.

[0169] Step 11, the frequency modulation device sends multiple virtual additional frequency trajectories to the grid side.

[0170] Step 12, the grid side generates frequency response information based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories.

[0171] Step 13, the grid side performs a security check on the frequency response information based on the pre-acquired frequency deviation information to obtain the security check result of the power system; wherein, the security check result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0172] In some embodiments, the frequency response information includes a frequency response value, and the frequency deviation information includes a frequency deviation value. On this basis, step 13 may include:

[0173] When the frequency response value is less than the frequency deviation value, it is determined that the security check result is that there is a risk of transient frequency response over-limit in the power system.

[0174] It should be noted that the number of frequency modulation devices included in the power system is continuously increased, starting from 100, increasing by 100 each time until the total number reaches 2000, that is, |N G | is taken as 100, 200, …, 2000. In these 21 scenarios, the existing centralized method (i.e., formula (1)) is used to perform simulations with a step size of 0.001 seconds and a duration of 60 seconds, and the distributed algorithm proposed in the embodiments of the present application is used for analysis. The time required for the analysis is as Figure 8 shown.

[0175] From Figure 8 it can be seen that the time required for the distributed algorithm proposed in the embodiments of the present application to complete a security check of the transient frequency response of the power system is much lower than that of the existing centralized method, and significantly slows down the speed of the analysis time with the growth of the device scale. It can cope with the massive heterogeneous characteristics shown by the devices participating in frequency control in the future power system, and is a highly compatible and scalable method for security check of the transient frequency response of the power system.

[0176] In addition, to demonstrate the accuracy of the embodiments of the present application, the number of frequency regulation devices included in the power system is taken as 20. Since the control parameters of each frequency regulation device are randomly selected, 50 scenarios are randomly generated here and analyzed using the existing centralized method and the distributed algorithm of the embodiments of the present application respectively. The lowest points of the transient frequency response of the power system calculated by different methods and the verification results are as Figure 9 shown.

[0177] It can be seen that the scenarios determined to be safe by the existing centralized method are exactly the same as those determined to be safe by the distributed algorithm of the embodiments of the present application, which proves the accuracy of the method proposed in the embodiments of the present application. On the other hand, it can also be seen that in the safe scenarios, the lowest frequencies corresponding to the frequency trajectories restored by the embodiments of the present application are slightly higher than the true trajectory ω(t) of the power system (the result calculated by the existing centralized method), while in the unsafe scenarios, the lowest frequencies corresponding to the frequency trajectories restored by the embodiments of the present application are slightly lower than the true trajectory ω(t) of the power system, which also reflects the conservativeness of the method proposed in the embodiments of the present application to a certain extent.

[0178] It should be understood that although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0179] Based on the same inventive concept, the embodiments of the present application also provide a distributed power frequency safety monitoring device for implementing the above-mentioned distributed power frequency safety monitoring method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the distributed power frequency safety monitoring device provided below can refer to the limitations on the distributed power frequency safety monitoring method in the above text, and will not be repeated here.

[0180] In an exemplary embodiment, as Figure 10 shown, a distributed power frequency safety monitoring device is provided, which is applied to the grid side and includes: a sending module 801, a generating module 802, and a safety detection module 803, where:

[0181] A sending module 801, configured to, when a transient disturbance occurs in the power system, send a pre-generated virtual frequency trajectory and a unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and send the plurality of virtual additional frequency trajectories to the grid side;

[0182] A generating module 802, configured to generate frequency response information based on a pre-acquired net disturbance trajectory and a plurality of virtual additional frequency trajectories;

[0183] A safety detection module 803, configured to perform a safety detection on the frequency response information based on pre-acquired frequency deviation information to obtain a safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0184] In an exemplary embodiment, the frequency response information includes a frequency response value, and the frequency deviation information includes a frequency deviation value. The safety detection module 803 is specifically configured to, when the frequency response value is less than the frequency deviation value, determine that the safety detection result is that there is a risk of transient frequency response over-limit in the power system.

[0185] In an exemplary embodiment, the sending module 801 is specifically configured to obtain the disturbance amplitude and frequency deviation information of the power system; and generate a virtual frequency trajectory based on the disturbance amplitude and the frequency deviation information.

[0186] In an exemplary embodiment, the sending module 801 is specifically configured to obtain the equivalent inertia and equivalent damping; and generate a unit impulse response sequence based on the equivalent inertia and equivalent damping.

[0187] In an exemplary embodiment, the generating module 802 is specifically configured to obtain the disturbance amplitude of the power system; and generate a net disturbance trajectory based on the unit impulse response sequence and the disturbance amplitude of the power system.

[0188] In an exemplary embodiment, as Figure 11 shown, a distributed power frequency safety monitoring device is provided, which is applied to a frequency modulation device and includes: an acquisition module 901 and a processing module 902, wherein:

[0189] An acquisition module 901, configured to acquire a virtual frequency trajectory and a unit impulse response sequence sent by the grid side;

[0190] A processing module 902 is configured to process a virtual frequency trajectory and a unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and send the plurality of virtual additional frequency trajectories to the grid side, so that the grid side generates frequency response information based on a pre-acquired net disturbance trajectory and the plurality of virtual additional frequency trajectories; perform a security detection on the frequency response information based on the pre-acquired frequency deviation information to obtain a security detection result of the power system; wherein the security detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0191] In an exemplary embodiment, the above-mentioned processing module 902 is specifically configured to perform an integration process on the virtual frequency trajectory to obtain a virtual active output power; perform a convolution process on the virtual active output power and the unit impulse response sequence to obtain a virtual additional frequency trajectory.

[0192] Each module in the above-mentioned distributed power frequency security monitoring device can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in the processor in the computer device in the form of hardware or be independent of the processor, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

[0193] In an exemplary embodiment, a distributed power frequency security monitoring system is provided. Continuing to refer to Figure 1 , the system includes a grid side 10 and a plurality of frequency modulation devices 11. When a transient disturbance occurs in the power system, the grid side 10 sends a pre-generated virtual frequency trajectory and a unit impulse response sequence to each frequency modulation device 11, so that they process the virtual frequency trajectory and the unit impulse response sequence according to a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and return these virtual additional frequency trajectories to the grid side 10. Subsequently, the grid side 10 generates frequency response information based on the pre-acquired net disturbance trajectory and the plurality of virtual additional frequency trajectories, and obtains a security detection result of the power system by performing a security detection on the pre-acquired frequency deviation information. The security detection result is used to determine whether there is a risk of transient frequency response over-limit in the power system. Among them, the frequency modulation device 11 refers to a device with frequency regulation ability in the power system, including a synchronous generator, a new energy power generation device equipped with additional frequency control, an energy storage system, etc.

[0194] In an exemplary embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 12As shown in the figure. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store relevant data during the distributed power frequency safety monitoring process. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through a network connection. When the computer program is executed by the processor, it realizes a distributed power frequency safety monitoring method.

[0195] Those skilled in the art can understand that Figure 12 the structure shown in the figure is only a block diagram of some structures related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0196] In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the following steps are implemented:

[0197] In the case of a transient disturbance in the power system, send the pre-generated virtual frequency trajectory and unit impulse response sequence to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and unit impulse response sequence based on the pre-established frequency control model, generates multiple virtual additional frequency trajectories, and sends the multiple virtual additional frequency trajectories to the grid side;

[0198] Generate frequency response information based on the pre-acquired net disturbance trajectory and multiple virtual additional frequency trajectories;

[0199] Perform a safety detection on the frequency response information based on the pre-acquired frequency deviation information to obtain a safety detection result of the power system; where the safety detection result is used to characterize whether there is a risk of transient frequency response over-limit in the power system.

[0200] In an embodiment, the frequency response information includes a frequency response value, and the frequency deviation information includes a frequency deviation value. When the processor executes the computer program, the following steps are also implemented:

[0201] When the frequency response value is less than the frequency deviation value, it is determined that the safety detection result is that there is a risk of transient frequency response exceeding the limit in the power system.

[0202] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0203] Obtain the disturbance amplitude and frequency deviation information of the power system;

[0204] Based on the disturbance amplitude and the frequency deviation information, generate a virtual frequency trajectory.

[0205] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0206] Obtain the equivalent inertia and equivalent damping;

[0207] Based on the equivalent inertia and equivalent damping, generate a unit impulse response sequence.

[0208] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0209] Obtain the disturbance amplitude of the power system;

[0210] Based on the unit impulse response sequence and the disturbance amplitude of the power system, generate a net disturbance trajectory.

[0211] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0212] Obtain the virtual frequency trajectory and the unit impulse response sequence sent by the grid side;

[0213] Based on a pre-established frequency control model, process the virtual frequency trajectory and the unit impulse response sequence to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the grid side, so that the grid side generates frequency response information based on the pre-obtained net disturbance trajectory and the multiple virtual additional frequency trajectories; perform safety detection on the frequency response information based on the pre-obtained frequency deviation information to obtain the safety detection result of the power system; wherein, the safety detection result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

[0214] In one embodiment, when the processor executes the computer program, the following steps are further implemented:

[0215] Perform integral processing on the virtual frequency trajectory to obtain the virtual active output power;

[0216] Perform convolution processing on the virtual active output power and the unit impulse response sequence to obtain the virtual additional frequency trajectory.

[0217] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0218] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0219] Those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above method embodiments. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0220] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this application.

[0221] The above embodiments only express several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. A distributed power frequency safety monitoring method, characterized in that: Applied to the power grid side, the method includes: In the event of a transient disturbance in the power system, the pre-generated virtual frequency trajectory and the unit impulse response sequence are sent to each frequency modulation device, so that each frequency modulation device processes the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and the plurality of virtual additional frequency trajectories are sent to the power grid side; Generate frequency response information based on the pre-acquired net disturbance trajectory and the plurality of virtual additional frequency trajectories; The frequency response information is safety checked based on the frequency deviation information acquired in advance to obtain a safety check result of the power system; wherein the safety check result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

2. The method according to claim 1, characterized in that The frequency response information includes a frequency response value, the frequency deviation information includes a frequency deviation value, and the performing safety detection on the frequency response information based on the pre-acquired frequency deviation information to obtain a safety detection result of the power system includes: When the frequency response value is less than the frequency deviation value, it is determined that the safety detection result is that there is a risk of transient frequency response exceeding a limit in the power system.

3. The method according to claim 1, characterized in that The generation process of the virtual frequency trajectory includes: Acquiring disturbance amplitude and frequency deviation information of the power system; The virtual frequency trajectory is generated based on the disturbance amplitude and the frequency deviation information.

4. The method according to claim 1, characterized in that The generation process of the unit impulse response sequence includes: Get equivalent inertia and equivalent damping; The unit impulse response sequence is generated based on the equivalent inertia and the equivalent damping.

5. The method according to claim 1, characterized in that The generation process of the net disturbance trajectory includes: Obtaining a disturbance amplitude of the power system; The net disturbance trajectory is generated based on the unit impulse response sequence and the disturbance amplitude of the power system.

6. A distributed power frequency safety monitoring method, characterized in that: Applied to frequency modulation equipment, the method comprises: Obtain the virtual frequency trajectory and unit impulse response sequence sent by the power grid side; The virtual frequency trajectory and the unit impulse response sequence are processed based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and the plurality of virtual additional frequency trajectories are sent to a power grid side, so that the power grid side generates frequency response information based on a pre-acquired net disturbance trajectory and the plurality of virtual additional frequency trajectories; a safety detection is performed on the frequency response information based on the pre-acquired frequency deviation information to obtain a safety detection result of the power system; wherein the safety detection result is used to characterize whether there is a risk of transient frequency response exceeding a limit in the power system.

7. The method according to claim 6, characterized in that The processing of the virtual frequency trajectory and the unit impulse response sequence based on the pre-established frequency control model to generate a plurality of virtual additional frequency trajectories includes: Integrating the virtual frequency trajectory to obtain virtual active output power; The virtual active output power and the unit impulse response sequence are convolved to obtain the virtual additional frequency trajectory.

8. A distributed power frequency safety monitoring device, characterized in that: Applied to the power grid side, the device comprises: A sending module, used for sending the pre-generated virtual frequency trajectory and the unit impulse response sequence to each frequency modulation device in the case of a transient disturbance in the power system, so that each frequency modulation device processes the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate a plurality of virtual additional frequency trajectories, and sends the plurality of virtual additional frequency trajectories to the power grid side; A generating module, configured to generate frequency response information based on a pre-acquired net disturbance trajectory and a plurality of said virtual additional frequency trajectories; A safety detection module is used to perform safety detection on the frequency response information based on the pre-acquired frequency deviation information to obtain a safety detection result of the power system; wherein the safety detection result is used to characterize whether there is a risk of transient frequency response exceeding the limit in the power system.

9. A distributed power frequency safety monitoring device, characterized in that: Applied to frequency modulation equipment, the device comprises: An acquisition module, used for acquiring a virtual frequency trajectory and a unit impulse response sequence sent by the power grid side; A processing module is used to process the virtual frequency trajectory and the unit impulse response sequence based on a pre-established frequency control model to generate multiple virtual additional frequency trajectories, and send the multiple virtual additional frequency trajectories to the power grid side, so that the power grid side generates frequency response information based on the pre-acquired net disturbance trajectory and the multiple virtual additional frequency trajectories; based on the pre-acquired frequency deviation information, the frequency response information is safety checked to obtain a safety check result of the power system; wherein the safety check result is used to characterize whether the power system has a transient frequency response over-limit risk.

10. A distributed power frequency safety monitoring system, the system comprising a power grid side and a plurality of frequency modulation devices; The grid side is used to perform the method according to claims 1-5; The multiple frequency modulation devices are used to execute the methods described in claims 6-7.

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