WO2024016682A1

WO2024016682A1 - Method and apparatus for evaluating inertia and primary frequency modulation capability of power supply nodes, and device

Info

Publication number: WO2024016682A1
Application number: PCT/CN2023/080497
Authority: WO
Inventors: 梁纪峰; 范辉; 李晓军; 曾四鸣; 李铁成; 戎士洋; 王蕾报
Original assignee: 国网河北省电力有限公司电力科学研究院; 国家电网有限公司; 国网河北能源技术服务有限公司
Priority date: 2022-07-21
Filing date: 2023-03-09
Publication date: 2024-01-25
Also published as: CN115000983A

Abstract

Embodiments of the present disclosure provide a method and apparatus for evaluating the inertia and primary frequency modulation capability of power supply nodes, and a device. The method comprises: injecting a small power disturbance into a power system, and calculating the impedance at each power supply node in the power system; drawing an amplitude response curve corresponding to a frequency response transfer function according to the impedance at the power supply node and the frequency response transfer function formula at the power supply node; and calculating the inertia coefficient and the primary frequency modulation capability coefficient of each power supply node according to each amplitude response curve. In this way, the inertia coefficient and the primary frequency modulation capability coefficient at each power supply node can be calculated in real time on the basis of impedance while ensuring the normal operation of the power system, such that the inertia and the primary frequency modulation capability of the power supply nodes can be quickly and accurately evaluated.

Description

Methods, devices and equipment for evaluating the inertia and primary frequency modulation capabilities of power nodes

Technical field

The present disclosure relates to the technical field of power systems, and in particular, to a method, device and equipment for evaluating the inertia and primary frequency regulation capability of a power node.

Background technique

To accelerate the transition to a low-carbon or carbon-neutral energy economy, more and more fossil fuel combustion units (FFUs) are being replaced by renewable generator units (RGUs). Most RGUs are connected to the power system through a power electronics interface (i.e., inverter). Therefore, they do not provide inherent inertia and effective frequency support after power interference, resulting in reduced system inertia levels and primary frequency regulation (PFR) capabilities. The decline has brought unprecedented challenges to the safe and stable operation of the power system.

In recent years, extensive research has been conducted on evaluation methods for the inertia and primary frequency regulation capability of power nodes in power systems. These methods can be divided into two major categories: offline evaluation and online evaluation. Among them, the offline evaluation mainly relies on the offline evaluation of large disturbance events, and the online evaluation is mainly the online evaluation of the system based on PMU measurement data. At present, the above methods generally suffer from problems such as low accuracy and poor efficiency. Therefore, how to quickly and accurately evaluate the inertia and primary frequency regulation capability of power nodes has become an urgent problem that needs to be solved.

Contents of the invention

The present disclosure provides a method, device, equipment and storage medium for evaluating the inertia and primary frequency modulation capability of a power node, which can quickly and accurately evaluate the inertia and primary frequency modulation capability of a power node.

In a first aspect, embodiments of the present disclosure provide a method for evaluating the inertia and primary frequency modulation capability of a power node. The method includes:

Inject small disturbance power into the power system and calculate the impedance at each power node in the power system;

According to the impedance at the power node and the frequency response transfer function formula at the power node, draw the amplitude response curve corresponding to the frequency response transfer function;

According to each amplitude response curve, the inertia coefficient and primary frequency modulation capability coefficient of each power node are calculated.

In some implementations of the first aspect, the small disturbance power is sinusoidal active power.

In some implementations of the first aspect, according to the impedance at the power node and the frequency response transfer function formula at the power node, an amplitude response curve corresponding to the frequency response transfer function is drawn, including:

Calculate the coupling impedance at the power node based on the impedance at the power node;

According to the coupling impedance at the power node and the frequency response transfer function formula at the power node, draw the amplitude response curve corresponding to the frequency response transfer function.

Among some implementable ways of the first aspect,

The frequency response transfer function formula at the power node is:

in, represents the frequency response transfer function, represents the coupling impedance at the power node, Represents the real-time voltage at the power node, represents the reference voltage at the power node, Represents the real-time frequency at the power node, Represents the phase-locked loop bandwidth.

In some implementation methods of the first aspect, the inertia coefficient and primary frequency modulation capability coefficient of each power node are calculated according to each amplitude response curve, including:

Extract resonant frequency and DC gain from the amplitude response curve;

Calculate the inertia coefficient of the power node based on the extracted resonant frequency;

Calculate the primary frequency modulation capability coefficient of the power node based on the extracted DC gain.

In some implementations of the first aspect, the inertia coefficient of the power node is calculated according to the extracted resonant frequency, including:

Calculate the inertia coefficient of the power node based on the extracted resonant frequency and inertia coefficient formula. The inertia coefficient formula is:

in, Represents the inertia coefficient of the power node, is the extracted resonant frequency, is the equivalent inductance of the power grid transmission line.

In some implementable ways of the first aspect, the primary frequency modulation capability coefficient of the power node is calculated according to the extracted DC gain, including:

Calculate the primary frequency modulation capability coefficient of the power node based on the extracted DC gain and primary frequency modulation capability coefficient formula. The primary frequency modulation capability coefficient formula is:

in, Indicates the primary frequency modulation capability coefficient of the power node, represents the resistance at the power node, represents the reference frequency at the power node, Indicates the nominal power capacity of the generator corresponding to the power node, Represents the extracted DC gain.

In the second aspect, embodiments of the present disclosure provide a device for evaluating the inertia and primary frequency modulation capability of a power node, which device includes:

The calculation module is used to inject small disturbance power into the power system and calculate the impedance at each power node in the power system;

A drawing module used to draw the amplitude response curve corresponding to the frequency response transfer function based on the impedance at the power node and the frequency response transfer function formula at the power node;

The calculation module is also used to calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node based on each amplitude response curve.

In a third aspect, embodiments of the present disclosure provide an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions Executed by at least one processor, so that at least one processor can perform the method as described above.

In a fourth aspect, embodiments of the present disclosure provide a non-transitory computer-readable storage medium storing computer instructions, the computer instructions being used to cause a computer to perform the method as described above.

In the present disclosure, a small disturbance power can be injected into the power system, and at this time, the impedance at each power supply node in the power system is calculated. According to the relationship between the impedance at the power supply node and the frequency response transfer function at the power supply node, plot The amplitude response curve corresponding to the frequency response transfer function is used to calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node based on each amplitude response curve.

In this way, from the perspective of impedance, the inertia coefficient and primary frequency regulation capability coefficient of each power supply node can be calculated in real time while ensuring the normal operation of the power system, and then the inertia and primary frequency regulation capability of the power supply node can be quickly and accurately evaluated.

It should be understood that what is described in this summary is not intended to identify key or important features of the embodiments of the disclosure, nor to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the description below.

Description of drawings

The above and other features, advantages, and aspects of various embodiments of the present disclosure will become more apparent with reference to the following detailed description taken in conjunction with the accompanying drawings. The drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the drawings, the same or similar reference numbers represent the same or similar elements, where:

Figure 1 shows a flow chart of a method for evaluating the inertia and primary frequency modulation capability of a power node provided by an embodiment of the present disclosure;

Figure 2 shows a relationship diagram between coupling impedance and frequency response transfer function provided by an embodiment of the present disclosure;

Figure 3 shows a schematic diagram of the amplitude response curve provided by an embodiment of the present disclosure;

Figure 4 shows a structural diagram of a device for evaluating the inertia and primary frequency modulation capability of a power node provided by an embodiment of the present disclosure;

Figure 5 shows a structural diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure.

Implementation

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments These are some embodiments of the present disclosure, but not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

In addition, the term "and/or" in this article is only an association relationship that describes related objects, indicating that there can be three relationships. For example, A and/or B can mean: A alone exists, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

In view of the problems that arise in the background technology, embodiments of the present disclosure provide a method, device and equipment for evaluating the inertia and primary frequency modulation capability of a power node. Specifically, small disturbance power can be injected into the power system, and at this time, the impedance at each power supply node in the power system is calculated, and the frequency response is plotted based on the relationship between the impedance at the power supply node and the frequency response transfer function at the power supply node. The amplitude response curve corresponding to the transfer function is used to calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node based on each amplitude response curve.

The method, device and equipment for evaluating the inertia and primary frequency modulation capability of a power node provided by embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Figure 1 shows a flow chart of a method for evaluating the inertia and primary frequency regulation capabilities of a power node provided by an embodiment of the present disclosure. As shown in Figure 1, the method 100 for evaluating inertia and primary frequency regulation capabilities may include the following steps:

S110, inject small disturbance power into the power system, and calculate the impedance at each power node in the power system.

Among them, the power system consists of power generation, power supply (power transmission, transformation, distribution), power consumption facilities, as well as the regulation control, relay protection and safety automatic devices required to ensure their normal operation, metering devices, dispatch automation, power communications and other secondary facilities constitute a unified whole. In this embodiment, most power supply nodes in the power system are RGUs.

In some embodiments, a certain power supply node in the power system can be used to inject small disturbance power (such as highly adjustable sinusoidal active power) into the power system, and then when the power system is injected with small disturbance power, the impedance can be used to The formula quickly calculates the impedance at each power node in the power system.

S120: Draw an amplitude response curve corresponding to the frequency response transfer function according to the impedance at the power node and the frequency response transfer function formula at the power node.

In some embodiments, the coupling impedance at the power supply node can be calculated according to the impedance at the power supply node, for example, the coupling impedance at the power supply node can be calculated according to the coupling impedance formula, and then the coupling impedance at the power supply node and the frequency response transfer at the power supply node can be calculated Function formula can quickly and accurately draw the amplitude response curve corresponding to the frequency response transfer function, that is, the amplitude response curve corresponding to each power node.

Among them, the frequency response transfer function formula at the power node can be as follows:

(1)

in, represents the frequency response transfer function at power node n, represents the coupling impedance at power node n, represents the real-time voltage at power node n, represents the reference voltage at power node n, represents the real-time frequency at power node n, Represents the phase-locked loop bandwidth. In this way, the coupling impedance can be used to equivalently represent the frequency response transfer function, which facilitates the use of impedance to quickly draw the amplitude response curve corresponding to the frequency response transfer function.

For example, the frequency response transfer function formula at the power node can be derived from the relationship diagram shown in Figure 2, as follows:

Based on the resonance point at the disturbance injection node, the equivalent capacitance caused by inertia and the equivalent inductance of the transmission line resonate in series, and the short-term frequency dynamic response process under low-power disturbance can be divided into two parts: inertial response and primary frequency response. The inertial response is immediately available and affects the rate-of-change of frequency (RoCoF) and frequency nadir. Typically, a frequency response occurs several seconds after a perturbation. For a given power disturbance, the primary frequency modulation capability mainly depends on the quasi-steady-state frequency deviation Δfss. The DC gain of the amplitude response curve of the frequency response transfer function FR(s) can be used to represent the primary frequency modulation capability of the power node.

Can pass impedance The converter realizes the relationship between the injected sinusoidal active power and the corresponding frequency of the power node n in the dq (rotating) coordinate system, and transfers the time-varying three-phase variables to the dq coordinate system through transformation. Therefore, the current and voltage relationship of power node n are as follows:

(2)

in, is the d-axis voltage, is the q-axis voltage, matrix is the impedance of power node n in the dq reference frame, is the d-axis current, is the q-axis current.

kp_c and ki_c in Figure 2 represent the proportional gain and integral gain of the internal current control respectively; SSAPP represents the grid tracking converter; the matrix represents the impedance of the power node n in the dq reference frame; Represents the phase-locked loops (PLL) transformation function.

It can be seen that the d-axis current and output active power Proportional to the q-axis voltage also with is proportional to the angle. It is worth noting that the design of phase-locked loops (PLL) also has a significant impact on the frequency response transfer function FR(s). When the phase locked loop ( ) When the bandwidth is less than 20Hz, the closed-loop transfer function is approximately =1. Considering the current bandwidth control loop, far greater than , the closed-loop transfer function of current control can also be approximated as GC(s)=1, then the frequency response transfer function FR(s) can be expressed as:

(3)

in, That is to say represents the real-time frequency at power node n, Indicates the output active power, represents the phase-locked loop bandwidth, represents the coupling impedance at power node n, represents the real-time voltage at power node n, Represents the reference voltage at power node n.

S130: Calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node based on each amplitude response curve.

In some embodiments, the resonant frequency and DC gain can be extracted from the amplitude response curve, the inertia coefficient of the corresponding power node can be quickly and accurately calculated based on the extracted resonant frequency, and the inertia coefficient of the corresponding power node can be quickly and accurately calculated based on the extracted DC gain. Primary frequency modulation capability coefficient.

For example, the inertia coefficient of the power node can be calculated based on the extracted resonant frequency and inertia coefficient formula. For example, the inertia coefficient formula can be:

(4)

in, represents the inertia coefficient of power node n, Represents the resonant frequency extracted from the amplitude response curve corresponding to power node n, is the equivalent inductance of the power grid transmission line.

At the same time, the primary frequency modulation capability coefficient of the power node can be calculated based on the extracted DC gain and primary frequency modulation capability coefficient formula. For example, ignoring the damping factor (D=0), the primary frequency modulation capability coefficient (MW/Hz) formula can be :

(5)

Among them, the damping factor (D=0) is ignored, Represents the primary frequency modulation capability coefficient of power node n, represents the resistance at power node n, represents the reference frequency at power node n, Indicates the nominal power capacity of the generator corresponding to power node n, Represents the DC gain extracted from the amplitude response curve corresponding to power node n.

As an example, the amplitude response curve can be shown in Figure 3, where the Resonance point is the resonance point, which is the resonance frequency to be extracted, is the DC gain to be extracted, so that the resonant frequency can be extracted from the amplitude response curve and DC gain , and then according to the resonant frequency and DC gain , calculate the primary frequency modulation capability coefficient of the power node.

S140: According to the inertia coefficient and primary frequency regulation capability coefficient of each power supply node, determine the power supply node with the lowest inertia and/or primary frequency regulation capability in the power system.

That is to say, based on the inertia coefficient and primary frequency modulation capability coefficient of each power supply node, the power supply node with the lowest inertia coefficient and/or primary frequency modulation capability coefficient is determined.

The disclosed embodiments can calculate the inertia of each power node in real time from the perspective of impedance while ensuring the normal operation of the power system, taking into account the challenges posed by unbalanced events under large disturbances and the lack of consideration of virtual inertial resources. Coefficient and primary frequency regulation capability coefficient, and then quickly and accurately evaluate the inertia and primary frequency regulation capability of each power node (such as synchronous and asynchronous power node), so as to find the power node with the weakest inertia and/or primary frequency regulation capability in the power system or region, providing a basic direction for developing appropriate control strategies to improve the frequency stability of low-inertia power systems.

Specifically, from the perspective of impedance, based on small disturbance injection and power domain impedance method, the approximate relationship between impedance and the corresponding frequency response transfer function FR(s) is derived, and based on this, the impedance-based power node inertia is established. and an implementation framework for real-time estimation of primary frequency regulation capabilities, thereby avoiding interruptions to the normal operation of the power system, enabling the inertia and primary frequency regulation capabilities of each power node to be quickly and accurately assessed in actual power systems, and providing grid operators with the opportunity to evaluate through impedance calculations The inertia and primary frequency modulation capability of each power node provide a new idea for non-invasive online evaluation.

It should be noted that for the sake of simple description, the foregoing method embodiments are expressed as a series of action combinations. However, those skilled in the art should know that the present disclosure is not limited by the described action sequence. Because in accordance with the present disclosure, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily necessary for the present disclosure.

The above is an introduction to the method embodiments. The solutions described in the present disclosure will be further described below through device embodiments.

Figure 4 shows a structural diagram of a device for evaluating inertia and primary frequency modulation capabilities of a power node provided according to an embodiment of the present disclosure. As shown in Figure 4, the device 400 for evaluating inertia and primary frequency modulation capabilities may include:

The calculation module 410 is used to inject small disturbance power into the power system and calculate the impedance at each power node in the power system.

The drawing module 420 is used to draw an amplitude response curve corresponding to the frequency response transfer function according to the impedance at the power node and the frequency response transfer function formula at the power node.

The calculation module 410 is also used to calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node according to each amplitude response curve.

In some embodiments, the small perturbation power is sinusoidal active power.

In some embodiments, the drawing module 420 is specifically used to:

Calculate the coupling impedance at the power node based on the impedance at the power node.

In some embodiments, the frequency response transfer function formula at the power node is:

In some embodiments, the computing module 420 is specifically used to:

Resonant frequency and DC gain are extracted from the amplitude response curve.

The inertia coefficient of the power node is calculated based on the extracted resonant frequency.

In some embodiments, the computing module 420 is specifically used to:

It can be understood that each module/unit in the inertia and primary frequency modulation capability evaluation device 400 shown in Figure 4 has the function of implementing each step in the inertia and primary frequency modulation capability evaluation method 100 provided by the embodiment of the present disclosure, and can achieve Its corresponding technical effects will not be repeated here for the sake of brevity.

Figure 5 shows a structural diagram of an electronic device that can be used to implement embodiments of the present disclosure. Electronic device 500 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. Electronic device 500 may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are examples only and are not intended to limit implementations of the disclosure described and/or claimed herein.

As shown in Figure 5, the electronic device 500 may include a computing unit 501, which may be configured according to a computer program stored in a read-only memory (ROM) 502 or loaded from a storage unit 508 into a random access memory (RAM) 503, to perform various appropriate actions and processing. In the RAM 503, various programs and data required for the operation of the electronic device 500 can also be stored. Computing unit 501, ROM 502 and RAM 503 are connected to each other via bus 504. An input/output (I/O) interface 505 is also connected to bus 504 .

Multiple components in the electronic device 500 are connected to the I/O interface 505, including: an input unit 506, such as a keyboard, a mouse, etc.; an output unit 507, such as various types of displays, speakers, etc.; a storage unit 508, such as a magnetic disk, an optical disk, etc. etc.; and communication unit 509, such as network card, modem, wireless communication transceiver, etc. The communication unit 509 allows the electronic device 500 to exchange information/data with other devices through a computer network such as the Internet and/or various telecommunications networks.

Computing unit 501 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processing processor (DSP), and any appropriate processor, controller, microcontroller, etc. Computing unit 501 performs various methods and processes described above, such as method 100 . For example, in some embodiments, method 100 may be implemented as a computer program product, including a computer program, tangibly embodied in a computer-readable medium, such as storage unit 508. In some embodiments, part or all of the computer program may be loaded and/or installed onto device 500 via ROM 502 and/or communication unit 509 . When the computer program is loaded into RAM 503 and executed by computing unit 501, one or more steps of method 100 described above may be performed. Alternatively, in other embodiments, computing unit 501 may be configured to perform method 100 in any other suitable manner (eg, by means of firmware).

Various implementations described above may be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on a chip (SOCs), loads Implemented in programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include implementation in one or more computer programs executable and/or interpreted on a programmable system including at least one programmable processor, the programmable processor The processor, which may be a special purpose or general purpose programmable processor, may receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device. An output device.

Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing device, such that the program codes, when executed by the processor or controller, cause the functions specified in the flowcharts and/or block diagrams/ The operation is implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this disclosure, computer-readable media may be tangible media that may contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. Computer-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any suitable combination of the foregoing. More specific examples of computer readable storage media would include one or more wires based electrical connection, portable computer disk, hard drive, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.

It should be noted that the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to execute the method 100 and achieve the corresponding technology achieved by the embodiments of the present disclosure executing the method. The effect is briefly described and will not be repeated here.

In addition, the present disclosure also provides a computer program product, which includes a computer program that implements the method 100 when executed by a processor.

In order to provide interaction with the user, the embodiments described above may be implemented on a computer having: a display device (for example, a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (eg, a mouse or trackball) through which a user can provide input to the computer. Other kinds of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and may be provided in any form, including acoustic input, speech input, or tactile input) to receive input from the user.

The embodiments described above may be implemented in a computing system that includes back-end components (eg, as a data server), or a computing system that includes middleware components (eg, an application server), or a computing system that includes front-end components (eg, with a graphics server). A user's computer with a user interface or web browser through which the user can interact with implementations of the systems and technologies described herein), or that includes such backend components, middleware components, or front-ends Any combination of components in a computing system. The components of the system may be interconnected by any form or medium of digital data communication (eg, a communications network). Examples of communication networks include: local area network (LAN), wide area network (WAN), and the Internet.

Computer systems may include clients and servers. Clients and servers are generally remote from each other and typically interact over a communications network. The relationship of client and server is created by computer programs running on corresponding computers and having a client-server relationship with each other. The server can be a cloud server, a distributed system server, or a server combined with a blockchain.

It should be understood that various forms of the process shown above may be used, with steps reordered, added or deleted. For example, each step described in the present disclosure can be executed in parallel, sequentially, or in a different order. As long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, there is no limitation here.

The above-mentioned specific embodiments do not constitute a limitation on the scope of the present disclosure. It will be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions are possible depending on design requirements and other factors. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this disclosure shall be included in the protection scope of this disclosure.

Claims

A method for evaluating the inertia and primary frequency modulation capability of a power node, characterized in that the method includes:

Inject small disturbance power into the power system and calculate the impedance at each power node in the power system;

Draw an amplitude response curve corresponding to the frequency response transfer function according to the impedance at the power node and the frequency response transfer function formula at the power node;

According to each amplitude response curve, the inertia coefficient and primary frequency modulation capability coefficient of each power node are calculated.
The method according to claim 1, characterized in that the small disturbance power is sinusoidal active power.
The method of claim 1, wherein the amplitude response curve corresponding to the frequency response transfer function is drawn based on the impedance at the power node and the frequency response transfer function formula at the power node, include:

Calculate the coupling impedance at the power node based on the impedance at the power node;

According to the coupling impedance at the power node and the frequency response transfer function formula at the power node, an amplitude response curve corresponding to the frequency response transfer function is drawn.
The method according to claim 3, characterized in that the frequency response transfer function formula at the power node is:

;

in, represents the frequency response transfer function, represents the coupling impedance at the power node, represents the real-time voltage at the power node, represents the reference voltage at the power node, represents the real-time frequency at the power node, Represents the phase-locked loop bandwidth.
The method of claim 1, wherein calculating the inertia coefficient and primary frequency modulation capability coefficient of each power node according to each amplitude response curve includes:

Extract the resonant frequency and DC gain from the amplitude response curve;

Calculate the inertia coefficient of the power node according to the extracted resonant frequency;

The primary frequency modulation capability coefficient of the power node is calculated according to the extracted DC gain.
The method of claim 5, wherein calculating the inertia coefficient of the power node based on the extracted resonant frequency includes:

Calculate the inertia coefficient of the power node according to the extracted resonant frequency and inertia coefficient formula. The inertia coefficient formula is: ;

in, represents the inertia coefficient of the power node, is the extracted resonant frequency, is the equivalent inductance of the power grid transmission line.
The method of claim 5, wherein calculating the primary frequency modulation capability coefficient of the power node based on the extracted DC gain includes:

Calculate the primary frequency modulation capability coefficient of the power node according to the extracted DC gain and primary frequency modulation capability coefficient formula. The primary frequency modulation capability coefficient formula is:

;

in, Indicates the primary frequency modulation capability coefficient of the power node, represents the resistance at the power node, represents the reference frequency at the power node, Indicates the nominal power capacity of the generator corresponding to the power node, Represents the extracted DC gain.
A device for evaluating the inertia and primary frequency modulation capability of a power supply node, characterized in that the device includes:

A calculation module used to inject small disturbance power into the power system and calculate the impedance at each power node in the power system;

A drawing module, configured to draw an amplitude response curve corresponding to the frequency response transfer function according to the impedance at the power node and the frequency response transfer function formula at the power node;

The calculation module is also used to calculate the inertia coefficient and primary frequency modulation capability coefficient of each power node according to each amplitude response curve.
An electronic device including:

at least one processor; and

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

The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform any one of claims 1-7 Methods.
A non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause a computer to execute the method according to any one of claims 1-7.