Method and device for calculating new energy bearing capacity of power system

Abstract

The invention discloses a power system new energy bearing capacity calculation method which comprises the following steps: performing frequency time domain simulation on a power system under a given frequency safety boundary, and recording active power of new energy and active power of a synchronous machine in a frequency time domain simulation process; when the system frequency does not reach the given frequency safety boundary, the active power of the new energy in the power system is increased according to the set amplitude, and meanwhile, the active power of a synchronous machine in the power system is reduced according to the increasing amplitude of the active power of the new energy until the system frequency reaches the given frequency safety boundary; and recording the corresponding new energy active power when the frequency reaches the boundary so as to calculate the new energy bearing capacity of the system.

Description

Technical Field

[0001] The present invention belongs to the new energy analysis technology of power systems, and particularly relates to a method and device for calculating the new energy carrying capacity of a power system. Background Art

[0002] With the construction and development of a new power system, new energy will gradually replace traditional synchronous machines as the main power source of the power grid. How much the maximum new energy penetration rate in the power grid can reach, that is, the new energy carrying capacity of the power grid, has become a key concern for power grid operation and planning personnel.

[0003] Traditional power system carrying capacity assessments mainly focus on the operating characteristics of conventional power sources, while ignoring the volatility of new energy resources and their profound impact on the power system operation mode. Therefore, existing carrying capacity calculation methods fail to effectively consider problems such as grid overload, frequency fluctuations, and power fluctuations that the system may face after the access of new energy, and lack comprehensive assessment means for system stability, power balance, and dispatching optimization after the large-scale access of new energy.

[0004] Currently, the assessment methods for the new energy carrying capacity in the system considering the safe and stable operation of the power grid mainly use transient simulation tools to analyze data on the power grid operation mode, which have problems such as low efficiency, resource consumption due to unknown grid structure, and lack of scientificity. Summary of the Invention

[0005] Based on this, the present invention aims to propose a method and device for calculating the new energy carrying capacity of a power system. Taking the power grid frequency stability as an index and facing the power grid planning scenario, the new energy penetration rate in the system is gradually increased, thereby calculating the new energy carrying capacity of the system.

[0006] In a first aspect, the present invention provides a method for calculating the new energy carrying capacity of a power system, including:

[0007] Frequency simulation step: performing frequency time-domain simulation on the power system under a given frequency safety boundary;

[0008] Increasing the active power of new energy in the power system according to a set amplitude, and reducing the active power of synchronous machines in the power system according to the increase amplitude of the active power of new energy until the system frequency reaches the given frequency safety boundary; otherwise, repeating the frequency simulation step;

[0009] Recording the active power of new energy corresponding to when the system frequency reaches the given frequency safety boundary as the boundary power, and calculating the new energy carrying capacity of the power system according to the boundary power.

[0010] Further, reducing the active power of synchronous machines in the power system according to the increase amplitude of the active power of new energy includes:

[0011] Calculate the maximum rate of change of the active power of each synchronous machine in the power system during the frequency-time domain simulation;

[0012] Sort the synchronous machines according to the maximum rate of change of the active power to generate the sorting result of the synchronous machines;

[0013] Determine the reduction amount of the active power of the synchronous machine according to the increase amplitude of the active power of the new energy;

[0014] Reduce the active power of each synchronous machine in sequence according to the sorting result of the synchronous machines until the sum of the reduction amounts of the active power of the synchronous machines in the system reaches the reduction amount of the power.

[0015] Furthermore, the calculation process of the maximum rate of change of the active power of the synchronous machine is as follows:

[0016] ,

[0017] where, represents the maximum rate of change of the active power of synchronous machine i, represents the initial active power of synchronous machine i, represents the maximum deviation between the active power and the initial active power of synchronous machine i during the frequency-time domain simulation of the active power.

[0018] Furthermore, calculating the new energy carrying capacity of the power system according to the boundary power includes:

[0019] Establish the mapping relationship between the active power of the new energy and the new energy penetration rate;

[0020] Based on the mapping relationship, calculate the new energy penetration rate when the frequency reaches the given frequency safety boundary according to the boundary power, and record the new energy penetration rate as the new energy carrying capacity of the power system.

[0021] Furthermore, the mapping relationship between the active power of the new energy and the new energy penetration rate is established as follows:

[0022] ,

[0023] where, represents the new energy penetration rate, represents the active power of the new energy, represents the active power of the system load.

[0024] Furthermore, the frequency simulation steps include:

[0025] Obtain the frequency response parameters of each power equipment in the power system;

[0026] Obtain the predicted values of the active power of the new energy and the load prediction values in the power system;

[0027] A frequency response model of a power system is established by using the frequency response parameters of each power equipment, the predicted value of the active power of new energy, and the predicted value of the load.

[0028] A given frequency safety boundary is set, and frequency time-domain simulation of the power system is carried out based on the frequency response model.

[0029] Furthermore, the frequency time-domain simulation of the power system based on the frequency response model includes:

[0030] The following formula is used to carry out frequency time-domain simulation of the power system:

[0031] ,

[0032] In the formula, represents the total inertia of the power system, represents the rate of change of frequency, , , , respectively represent the difference between the active power output and the initial active power of the synchronous machine, DC equipment, new energy, and load in the power system at a certain moment when the system frequency changes, represents the disturbance of the active power of the system.

[0033] In the second aspect, the present invention proposes a calculation device for the new energy carrying capacity of a power system, including:

[0034] A frequency simulation module, which is used to carry out frequency time-domain simulation of the power system under a given frequency safety boundary;

[0035] A power adjustment module, which is used to increase the active power of new energy in the power system by a set amplitude, and reduce the active power of the synchronous machine in the power system according to the increase amplitude of the active power of new energy until the system frequency reaches the given frequency safety boundary, otherwise, the frequency simulation module is made to repeatedly execute the frequency time-domain simulation;

[0036] A carrying capacity calculation module, which is used to record the active power of new energy corresponding to when the system frequency reaches the given frequency safety boundary as the boundary power, and calculate the new energy carrying capacity of the power system according to the boundary power.

[0037] In the third aspect, the present invention provides an electronic device, including a memory storing computer-executable instructions and a processor. When the computer-executable instructions are executed by the processor, the device executes each step of the method for calculating the new energy carrying capacity of the power system provided in the first aspect.

[0038] In the fourth aspect, the present invention provides a readable storage medium, storing a computer-executable program, which can implement each step of the method for calculating the new energy carrying capacity of the power system provided in the first aspect when the program is executed.

[0039] The present invention has the following beneficial effects:

[0040] The present invention proposes a method for calculating the new - energy carrying capacity of a power system. It conducts frequency - time - domain simulation on the power system under a given frequency safety boundary, records the active power of new energy and the active power of synchronous machines during the frequency - time - domain simulation process. When the system frequency does not reach the given frequency safety boundary, it increases the active power of new energy in the power system by a set amplitude, and at the same time reduces the active power of synchronous machines in the power system according to the increased amplitude of the active power of new energy until the system frequency reaches the given frequency safety boundary, and records the active power of new energy corresponding to when the frequency reaches the boundary, thereby calculating the new - energy carrying capacity of the system. The present invention innovatively proposes a method for calculating the new - energy carrying capacity based on system - frequency stability, further improving the safety and stability of the new - type power system and ensuring the safe and stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0042] Figure 1 is the implementation flowchart of the method for calculating the new - energy carrying capacity of the power system provided by the embodiment of the present invention;

[0043] Figure 2 is the structural schematic diagram of the device for calculating the new - energy carrying capacity of the power system provided by the embodiment of the present invention;

[0044] Figure 3 is the architecture diagram of the electronic device provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] Refer to Figure 1 , an embodiment of the present invention provides a method for calculating the new - energy carrying capacity of a power system, including the following steps:

[0047] Step S110. Conduct frequency - time - domain simulation on the power system under a given frequency safety boundary.

[0048] The frequency-time domain simulation in this step is a simulation based on the transient model established for the power system. For frequency simulation calculations, a frequency response model of the equipment is established. Based on the given frequency safety and stability operation boundary, through the time-domain simulation algorithm, the penetration rate of new energy is continuously increased to calculate the bearing capacity of the system for new energy within the safe operation range.

[0049] Specifically, new energy refers to renewable energy forms such as wind energy, solar energy, and water energy. New energy usually has volatility and intermittency. Introducing new energy into the power system can reduce the dependence on traditional fossil energy.

[0050] Furthermore, the frequency-time domain simulation in step S110 includes the following steps:

[0051] Step S111. Obtain the frequency response parameters of each power equipment in the power system;

[0052] Step S112. Obtain the predicted values of the active power of new energy and the predicted value of the load in the power system;

[0053] Step S113. Use the frequency response parameters of each power equipment, the predicted value of the active power of new energy, and the predicted value of the load to establish a frequency response model of the power system;

[0054] Step S114. Set the given frequency safety boundary and perform frequency-time domain simulation on the power system based on the frequency response model.

[0055] Specifically, the frequency-time domain simulation refers to simulating the frequency response of the power system under specific operating conditions, evaluating the stability of the system under different load and generation states, using a dynamic unit model to describe the generation behavior, and using a load model to simulate load fluctuations. Select a set of data for a typical mode, and read the frequency response parameters of synchronous machines, DC systems, new energy power generation systems, and loads in the power grid; among them, the synchronous machine model reads the detailed frequency response parameters of the governor and the prime mover, the DC system and the new energy power generation system read the frequency regulation control parameters, and the load reads the frequency response parameters of the static load and the motor load; secondly, according to the new energy and load prediction results, the sum of the active power of the new energy, the frequency response model of the load active power, and the active power of the synchronous machine is the difference between the load active power and the active power of the new energy.

[0056] Specifically, the following formula can be used to perform frequency-time domain simulation on the power system:

[0057] ,

[0058] In the formula, represents the total inertia of the power system, represents the frequency change rate, , , , respectively represent the differences between the active power output and the initial active power of the synchronous machine, DC equipment, new energy, and load in the power system at a certain moment when the system frequency changes. represents the active power disturbance amount of the system.

[0059] Furthermore, the initial active power of each synchronous machine device is allocated according to the proportion of the initial active power output of the synchronous machine in the typical mode data, which is expressed as follows:

[0060]

[0061] Among them, is the initial active power of synchronous machine i, is the initial active power of synchronous machine i in the typical mode data, is the sum of the initial active powers of all synchronous machines in the typical mode data, and respectively represent the active power of the load and the active power of new energy based on the prediction results.

[0062] In a further embodiment, the given frequency safety boundary is usually set according to the technical requirements of the power grid, the equipment carrying capacity, and the system dispatching capacity. The given frequency safety boundary usually includes the lowest frequency point, the highest frequency point, and the quasi-steady state frequency deviation. Exemplarily, based on the simulation model provided above, a frequency safety boundary can be given as when the maximum power disturbance is , the highest frequency point is not greater than , the lowest frequency point is not less than , and the quasi-steady state frequency range is , . The user should give the parameters , , , , according to the actual characteristics of the target power grid.

[0063] Step S120. Increase the active power of new energy in the power system by a set amplitude, and reduce the active power of synchronous machines in the power system according to the increase amplitude of the active power of new energy until the system frequency reaches the given frequency safety boundary; otherwise, return to step S110.

[0064] Before the system frequency reaches the given frequency safety boundary, the active power output of new energy sources (such as wind power, photovoltaic power, etc.) in the power system is gradually increased by a predetermined amplitude, while the active power output of synchronous generators (such as traditional thermal power and hydroelectric generator sets) in the system is reduced. After each adjustment of the active power output of new energy and synchronous machines, a frequency time-domain simulation is performed to observe the change in system frequency until the system frequency reaches the given frequency safety boundary. At this time, it can be considered that the system has reached the maximum bearing capacity for new energy.

[0065] Specifically, set the calculation step size of the simulation, calculate the frequency time-domain simulation curve of the system after the disturbance intervenes, and judge whether the frequency meets the given frequency safety boundary. If the system frequency exceeds the safety boundary in the first simulation, it is considered that the relevant control parameters need to be adjusted for the current operation mode, for example, reducing the set active power disturbance amount of the system.

[0066] In a further embodiment, reducing the active power of synchronous machines in the power system according to the increase amplitude of the active power of new energy sources includes the following process:

[0067] Step S121. Calculate the maximum rate of change of the active power of each synchronous machine in the power system during the frequency time-domain simulation process.

[0068] Specifically, the maximum rate of change of the active power of the synchronous machine calculated in this step is expressed as follows:

[0069]

[0070] Among them, represents the maximum rate of change of the active power of synchronous machine i, represents the initial active power of synchronous machine i, represents the maximum deviation between the active power of synchronous machine i in the frequency time-domain simulation and the initial active power of.

[0071] Step S122. Sort the synchronous machines according to the maximum rate of change of the active power to generate a synchronous machine sorting result.

[0072] Specifically, in this step, the synchronous machines are sorted from smallest to largest according to the maximum rate of change of the active power, that is, the synchronous machine with the smallest rate of change will be ranked first, and the synchronous machine with the largest rate of change will be ranked last. Synchronous machines with a smaller rate of change mean that their adjustment response is slower and their adjustment ability is weaker, and usually their power output needs to be adjusted first.

[0073] Step S123. Determine the power reduction amount of the synchronous machine according to the increase amplitude of the active power of the new energy source.

[0074] Specifically, determine the increase amplitude of the active power of the new energy source, and calculate the power reduction amount of the synchronous machine according to this amplitude. Assume that the increase amount of the active power of the new energy source is , in order to maintain the power balance of the system, the same amount of power needs to be subtracted from the active output of the synchronous machine.

[0075] Step S124. According to the synchronous machine sorting result, sequentially reduce the active power of each synchronous machine until the sum of the active power reduction amounts of the synchronous machines in the system reaches the power reduction amount.

[0076] In this step, the active output of the synchronous machine is reduced according to the synchronous machine sorting result, that is, the output of the units ranked higher is preferentially reduced. Taking the synchronous machine sorting result obtained by sorting from small to large as an example above, the synchronous machines with smaller change rates will bear more power reduction amounts because these synchronous machines have weaker regulation capabilities and slower adjustment speeds. Starting from the synchronous machine with the smallest maximum change rate, gradually reduce its active power in sequence until the total active power reduction amount of the synchronous machines in the system reaches the power increase amount of the new energy. , that is, start reducing the power from the synchronous machine with the smallest change rate and gradually advance.

[0077] After each adjustment of the synchronous machine power, it is necessary to recalculate the system frequency and check whether the frequency is still within the safe boundary. If the frequency is too low or too high, it is necessary to adjust the power reduction amount or further adjust the synchronous machine power output through other regulation mechanisms.

[0078] Exemplarily, if the active power of the new energy is increased by 0.1%, update the active power of the new energy to , the active power of the synchronous machine should be reduced by 0.1%. Starting from the first synchronous machine unit according to the synchronous machine sorting result, reduce the active output. If the output of a certain unit has been reduced to 0 while the output reduction amount of the synchronous machine units has not reached 0.1% yet, continue to reduce the active output of the second unit in sequence until the total active output of the synchronous machine units has been reduced by 0.1%. After the adjustment, return to the frequency time-domain simulation in step S110.

[0079] Step S130. Record the active power of the new energy corresponding to when the system frequency reaches the given frequency safe boundary as the boundary power, and calculate the new energy carrying capacity of the power system according to the boundary power.

[0080] Specifically, the new energy carrying capacity refers to the maximum active power of the new energy that the power system can carry, ensuring that the system frequency is within the safe boundary while meeting the load demand. In this step, record the active power value of the new energy corresponding to when the power system frequency reaches the given frequency safe boundary, and use this data to calculate the new energy carrying capacity of the system. The new energy carrying capacity refers to the maximum active power of the new energy that the power system can carry without violating the frequency safe boundary.

[0081] Further, in this step, the new - energy penetration rate is recorded as the new - energy carrying capacity of the system, and the mapping relationship between the active power of new energy and the new - energy penetration rate is established as follows:

[0082]

[0083] Among them, represents the new - energy penetration rate, represents the active power of new energy, represents the active power of the system load.

[0084] In a further embodiment, if the overall stability and power balance of the system are considered, the boundary power needs to be further corrected according to factors such as the inertia and regulation ability of the system.

[0085] The above - mentioned embodiments propose a method for calculating the new - energy carrying capacity of a power system. Perform frequency - domain simulation on the power system under a given frequency - safety boundary, record the active power of new energy and the active power of synchronous machines during the frequency - domain simulation process. When the system frequency does not reach the given frequency - safety boundary, increase the active power of new energy in the power system by a set amplitude, and at the same time reduce the active power of synchronous machines in the power system according to the increased amplitude of the active power of new energy until the system frequency reaches the given frequency - safety boundary, and record the corresponding active power of new energy when the frequency reaches the boundary, so as to calculate the new - energy carrying capacity of the system, further improve the safety and stability of the new - type power system, and ensure the safe and stable operation of the power grid.

[0086] The above - disclosed method can be implemented by various forms of devices. Therefore, the present invention also discloses a device for calculating the new - energy carrying capacity of a power system corresponding to the above - mentioned method. Specific embodiments are given below for detailed description.

[0087] As Figure 2 shown, an embodiment of the present invention provides a device for calculating the new - energy carrying capacity of a power system, including:

[0088] A frequency - simulation module 202, configured to perform frequency - domain simulation on the power system under a given frequency - safety boundary;

[0089] A power - regulation module 204, configured to increase the active power of new energy in the power system by a set amplitude, and reduce the active power of synchronous machines in the power system according to the increased amplitude of the active power of new energy until the system frequency reaches the given frequency - safety boundary, otherwise make the frequency - simulation module repeatedly execute the frequency - domain simulation;

[0090] A carrying - capacity calculation module 206, configured to record the active power of new energy corresponding to when the system frequency reaches the given frequency - safety boundary as the boundary power, and calculate the new - energy carrying capacity of the power system according to the boundary power.

[0091] The device provided by the embodiment of the present application has the same implementation principle and technical effects as those of the foregoing method embodiment. For the sake of brief description, for the parts not mentioned in the device embodiment, reference may be made to the corresponding content in the foregoing method embodiment.

[0092] The methods and related devices mentioned in the foregoing embodiments are described with reference to the method flowcharts and / or structural schematic diagrams provided by the embodiments of the present application. Specifically, each process and / or block of the method flowchart and / or structural schematic diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or structural schematic Figure 1 These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one process or multiple processes and / or structural schematic Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or structural schematic one block or multiple blocks.

[0093] The following embodiments are described by taking the application of the method to a computer device as an example. It can be understood that the computer device can be any device with computing and processing functions, and can be, but is not limited to, a server or a personal laptop computer, etc. In one of the embodiments, the computer device can be an application server, and the application server can be a server for running an application program to be tested.

[0094] Refer to Figure 3, which shows a hardware block diagram of an electronic device. 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 processors, cellular phones, smart phones, wearable devices, 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 application described herein and / or claimed.

[0095] As Figure 3 shown, the electronic device includes: at least one processor 1, at least one communication interface 2, at least one memory 3, and at least one communication bus 4;

[0096] In the embodiments of the present application, the number of the processor 1, the communication interface 2, the memory 3, and the communication bus 4 is at least one, and the processor 1, the communication interface 2, and the memory 3 complete communication with each other through the communication bus 4;

[0097] The processor 1 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present invention, etc.;

[0098] The memory 3 may include high-speed RAM memory, and may also include non-volatile memory, etc., such as at least one disk memory;

[0099] Among them, the memory stores a program, and the processor can call the program stored in the memory. The program is used to: implement each processing flow of the foregoing power system new energy carrying capacity calculation scheme.

[0100] The embodiments of the present invention also provide a readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements each processing flow of the power system new energy carrying capacity calculation scheme provided by any possible implementation manner of the foregoing embodiments and / or combined embodiments.

[0101] The above-described embodiments have described the present invention in particular detail with respect to possible scenarios. Those skilled in the art will recognize that the present invention can be practiced through other embodiments. The specific naming of components, the case of terms, attributes, data structures, or any other programming or structural aspects are not mandatory or important. The mechanisms or features for implementing the present invention can have different names, forms, or procedures. The system can be implemented through a combination of hardware and software (as described), entirely through hardware elements, or entirely through software elements. The specific division of functions between the various system components described in the text is exemplary and not mandatory; conversely, the functions performed by a single system component can be performed by multiple components, or the functions performed by multiple components can be performed by a single component.

[0102] Those skilled in the art should understand that the various steps of the methods disclosed above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed across a network composed of multiple computing devices. Optionally, they can be implemented with program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them can be fabricated into a single integrated circuit module for implementation. Thus, the disclosure of the embodiments of the present invention is not limited to any specific combination of hardware and software.

[0103] These programs executable by a computing device (also referred to as programs, software, software applications, or code) include machine instructions for a programmable processor and can be implemented using high-level procedural and / or object-oriented programming languages and / or assembly / machine languages. As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, device, and / or apparatus (e.g., disk, optical disk, memory, programmable logic device (PLD)) for providing machine instructions and / or data to a programmable processor, including a machine-readable medium that receives machine instructions as a machine-readable signal. The term "machine-readable signal" refers to any signal for providing machine instructions and / or data to a programmable processor.

[0104] Certain aspects of the present invention include the process steps and instructions described in the text in the form of algorithms. It should be noted that the process steps and instructions of the present invention can be implemented in software, firmware, and / or hardware. When implemented by software, it can be downloaded and thus saved on different platforms used by various operating systems and operated from those platforms.

[0105] Those skilled in the art can understand that the structures shown in the drawings are only block diagrams of some structures related to the solution of the present application, and do not constitute a limitation on the terminal devices to which the solution of the present application is applied. The specific terminal devices may include more or fewer components than those shown in the figures, or combine some components, or have different component arrangements.

[0106] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "possible design", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the new energy carrying capacity of a power system, characterized in that: include: Frequency simulation steps: Perform frequency time domain simulation on the power system under a given frequency safety boundary; Increasing the active power of the renewable energy in the power system according to the set amplitude, and reducing the active power of the synchronous machine in the power system according to the increase amplitude of the active power of the renewable energy, until the system frequency reaches the given frequency safety boundary, otherwise repeating the frequency simulation step; The active power of the new energy corresponding to when the system frequency reaches the given frequency safety boundary is recorded as the boundary power, and the new energy carrying capacity of the power system is calculated based on the boundary power.

2. The method according to claim 1, characterized in that The reducing the active power of the synchronous machine in the power system according to the increase of the active power of the new energy comprises: Calculate the maximum rate of change of active power of each synchronous machine in the power system during frequency time domain simulation; sorting the synchronous machines according to the maximum active power change rate, and generating a synchronous machine sorting result; Determine the power reduction of the synchronous machine according to the increase of the active power of the new energy; According to the synchronous machine sorting result, the active power of each synchronous machine is reduced in sequence until the sum of the active power reductions of the synchronous machines in the system reaches the power reduction amount.

3. The method according to claim 2, characterized in that The maximum rate of change of active power of the synchronous machine is calculated as follows: ， in, represents the maximum rate of change of active power of synchronous machine i, represents the initial active power of synchronous machine i, represents the active power and initial active power of synchronous machine i in frequency time domain simulation The maximum deviation.

4. The method according to claim 1, characterized in that: Calculating the new energy carrying capacity of the power system according to the boundary power includes: Establish a mapping relationship between the active power of new energy and the penetration rate of new energy; Based on the mapping relationship, the new energy penetration rate is calculated according to the boundary power when the frequency reaches a given frequency safety boundary, and the new energy penetration rate is recorded as the new energy carrying capacity of the power system.

5. The method according to claim 4, characterized in that The mapping relationship between the active power of new energy and the penetration rate of new energy is established as follows: ， in, represents the penetration rate of new energy, Represents the active power of new energy, Indicates the active power of the system load.

6. The method according to claim 1, characterized in that The frequency simulation step comprises: Obtain frequency response parameters of each power device in the power system; Obtain forecast values ​​of active power and load of renewable energy sources in the power system; The frequency response model of the power system is established using the frequency response parameters of each power device, the predicted value of the active power of new energy sources and the predicted value of the load; A given frequency safety margin is set, and a frequency time domain simulation of the power system is performed based on the frequency response model.

7. The method according to claim 6, characterized in that The frequency time domain simulation of the power system based on the frequency response model comprises: The following formula is used to perform frequency and time domain simulation of the power system: ， In the formula, represents the total inertia of the power system, represents the frequency change rate, , , , They respectively represent the difference between the active power output of the synchronous machine, DC equipment, new energy, and load in the power system at a certain moment when the system frequency changes and the initial active power. Indicates the system active power disturbance.

8. A device for calculating the new energy carrying capacity of an electric power system, characterized in that: include: Frequency simulation module, used to perform frequency time domain simulation of the power system under a given frequency safety boundary; A power regulation module, used to increase the active power of the renewable energy in the power system according to a set amplitude, and reduce the active power of the synchronous machine in the power system according to the increase amplitude of the active power of the renewable energy, until the system frequency reaches a given frequency safety boundary, otherwise the frequency simulation module is made to repeat the frequency time domain simulation; The carrying capacity calculation module is used to record the active power of the corresponding renewable energy when the system frequency reaches a given frequency safety boundary as the boundary power, and calculate the renewable energy carrying capacity of the power system based on the boundary power.

9. An electronic device, characterized in that: It includes a memory storing computer executable instructions and a processor. When the computer executable instructions are executed by the processor, the device executes the method for calculating the new energy carrying capacity of the power system as described in any one of claims 1 to 7.

10. A readable storage medium, characterized in that: A computer executable program is stored, and when the program is executed, the method for calculating the new energy carrying capacity of the power system as described in any one of claims 1 to 7 can be implemented.

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