CN115833249A - Virtual synchronization control method, device, equipment and storage medium for power grid - Google Patents
Virtual synchronization control method, device, equipment and storage medium for power grid Download PDFInfo
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Abstract
The invention discloses a virtual synchronization control method, a virtual synchronization control device, virtual synchronization control equipment and a virtual synchronization control storage medium for a power grid. The virtual synchronization control method for the power grid comprises the following steps: acquiring operating parameters of a synchronous generator and a converter in a power grid; respectively establishing transient models of the synchronous generator and the converter based on the operation parameters; solving the transient models of the synchronous generator and the converters by taking the minimum total inertia of the power grid as a target to obtain the virtual inertia and the virtual damping coefficient of each converter; and setting each converter based on the virtual inertia and the virtual damping coefficient. The method comprises the steps of obtaining operation parameters of a synchronous generator and a converter in a power grid, then establishing a transient model of the synchronous generator and the converter, solving the transient model by taking the minimum total inertia of the power grid as a target, obtaining virtual inertia and virtual damping coefficients of each converter, and ensuring the stability of the whole power grid, so that the frequency stability and the transient power angle stability of the power grid under the fault condition are ensured.
Description
Technical Field
The invention relates to the technical field of power grid synchronization, in particular to a power grid virtual synchronization control method, device, equipment and storage medium.
Background
With more and more new energy sources being connected to the power system through power electronic devices, modern power systems gradually turn from a large-inertia, high-damping strong power grid dominated by synchronous motors to a flexible weak power grid dominated by power electronic converters.
Although the introduction of the power electronic converter enables the energy flow of the power supply system to be controllable, the response speed and the efficiency of the system to be improved, and the energy flow of the power supply system can be managed under multiple time scales, the large inertia and the high damping characteristic of rotating devices such as synchronous motors are lacked, so that after large-scale new energy is connected into a power grid, the integral inertia of the power system is reduced, and the instability risk is increased. In the virtual synchronization technology appearing in recent years, a virtual inertia control link is added in the control of the power electronic converter, so that the overall inertia of the system is improved, the system has the frequency and voltage regulation characteristics similar to those of the traditional synchronous generator, and the virtual synchronization technology plays a positive role in stabilizing the power system. However, simply increasing the virtual inertia of the converter can only ensure the frequency stability of the system to disturbance, and if the virtual inertia parameters are set and distributed at unreasonable positions, power oscillation of the system may occur, and even transient power angle instability may occur.
Disclosure of Invention
The invention provides a virtual synchronization control method, a virtual synchronization control device, a virtual synchronization control equipment and a virtual synchronization control storage medium of a power grid, and aims to effectively improve the stability of virtual synchronization of the power grid.
According to an aspect of the present invention, there is provided a power grid virtual synchronization control method, including:
acquiring operating parameters of a synchronous generator and a converter in a power grid;
establishing transient models of the synchronous generator and the converter respectively based on the operation parameters;
solving the transient models of the synchronous generator and the converters by taking the minimum total inertia of the power grid as a target to obtain the virtual inertia and the virtual damping coefficient of each converter;
and setting each converter based on the virtual inertia and the virtual damping coefficient.
Optionally, the respectively establishing transient models of the synchronous generator and the converter based on the operating parameters includes:
constructing a generator transient model of the synchronous generator based on the operating parameters of the synchronous generator;
constructing a converter transient model of the converter based on the operating parameters of the converter;
and constructing a system power flow equation of the power grid based on the generator transient model and the converter transient model.
Optionally, the constructing a generator transient model of the synchronous generator based on the operating parameters of the synchronous generator includes:
establishing a generator transient model of the synchronous generator based on the following equation:
wherein, delta Gi For the power angle, w, of the synchronous generator of station i 0 Is the rated angular speed of the power grid; w is a Gi The angular speed of the ith synchronous generator; h Gi The inertia constant of the ith synchronous generator is obtained; d Gi The damping coefficient of the ith synchronous generator is set; p is mGi Mechanical power of the i-th synchronous generator; p eGi The electromagnetic power of the ith synchronous generator; e' Gi Transient potential of the ith synchronous generator; x is the number of Gi Transient reactance of the ith synchronous generator; e.g. of the type Gi、 f Gi The real part and the imaginary part of the voltage of the ith synchronous generator are respectively.
Optionally, the constructing a converter transient mode of the converter based on the operation parameters of the converter includes:
establishing a converter transient model of the converter based on the following formula:
wherein, delta xi Is the virtual power angle, w, of the i-th said converter 0 Is the rated angular speed of the power grid; w is a Xi The virtual angular speed of the ith converter is obtained; h Xi The virtual inertia constant of the ith converter is obtained; d Xi The virtual damping coefficient of the ith converter is set; p mXi The command power of the ith converter is obtained; p eXi The output power of the ith converter is obtained; g is a control model of the converter, U Xi The port voltage of the ith converter is the port voltage of the ith converter; i is Xi The current is the port current of the ith current transformer.
Optionally, the constructing a system power flow equation of the power grid based on the generator transient model and the converter transient model includes:
establishing a system power flow equation of the power grid based on the following formula:
0＝g(x，y)
wherein g is a system power flow equation; x is a differential state variable of the transient state model of the generator and the transient state model of the converter, and y is a node voltage current algebraic variable.
Optionally, the solving the transient models of the synchronous generator and the converters with the minimum total inertia of the power grid as a target to obtain virtual inertia and a virtual damping coefficient of each converter includes:
calculating the virtual inertia and the virtual damping coefficient of each converter based on the following formulas:
wherein minHt otal Is a minimum total inertia of the grid; NG is the number of the synchronous generators; NX is the number of the current transformers; s Gi Rated power of the ith synchronous generator; s Xi The rated power of the current transformer of the ith station.
Optionally, a genetic algorithm is used to jointly solve the transient models of the synchronous generator and the converter.
According to another aspect of the present invention, there is provided a virtual synchronization control apparatus for a power grid, including:
the acquisition module is used for acquiring the operating parameters of the synchronous generator and the converter in the power grid;
an establishing module for performing respective establishment of transient models of the synchronous generator and the converter based on the operating parameters;
the calculation module is used for solving the transient models of the synchronous generator and the converters by taking the minimum total inertia of the power grid as a target to obtain the virtual inertia and the virtual damping coefficient of each converter;
and the execution module is used for executing the setting of each converter based on the virtual inertia and the virtual damping coefficient.
According to another aspect of the present invention, there is provided a virtual synchronization control apparatus for a power grid, the apparatus comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power grid virtual synchronization control method according to any embodiment of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the virtual synchronization control method of the power grid according to any embodiment of the present invention when the computer instructions are executed.
According to the technical scheme of the embodiment of the invention, the operation parameters of the synchronous generator and the converter in the power grid are obtained, then the transient models of the synchronous generator and the converter are established, the transient model is solved by taking the minimum total inertia of the power grid as a target, the virtual inertia and the virtual damping coefficient of each converter are obtained, the virtual inertia and the virtual damping coefficient of each converter can be obtained from the global angle of the power grid, the stability of the whole power grid is ensured, and therefore, the frequency stability and the transient power angle stability of the power grid under the fault condition are ensured.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a virtual synchronization control method for a power grid according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus 1 according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device implementing the method 1 according to the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of an embodiment of the present invention, which provides a method for controlling virtual synchronization of a power grid, where the embodiment is applicable to a case where virtual synchronization of a power grid is controlled, and the method may be executed by a virtual synchronization control device of the power grid, where the virtual synchronization control device of the power grid may be implemented in a form of hardware and/or software, and the virtual synchronization control device of the power grid may be configured in a computer device, such as a server, a workstation, a personal computer, and the like. As shown in fig. 1, the method includes:
and S110, acquiring the operating parameters of the synchronous generator and the converter in the power grid.
In the embodiments of the present invention, a synchronous generator is mainly referred to as a synchronous motor that operates as a generator. Is one of the most commonly used alternators. In the modern power industry, it is widely used for hydroelectric power generation, thermal power generation, nuclear power generation, and diesel engine power generation. Because the synchronous generator generally adopts direct current excitation, when the single machine of the synchronous generator operates independently, the voltage of the generator can be conveniently adjusted by adjusting the excitation current. If the synchronous generator is connected with a power grid to operate, two or more synchronous generators are respectively connected with corresponding buses of a power system, or are connected with a public bus of the power system through a main transformer and a power transmission line to jointly supply power to a user, and the voltage cannot be changed because the voltage is determined by the power grid, so that the power factor and the reactive power of the motor are adjusted as a result of adjusting the exciting current.
The virtual synchronous machine technology generally refers to a technology that an electromechanical transient equation of a synchronous motor is adopted in a control link of a power electronic converter, so that a device adopting the technology is operated in a grid-connected mode, and has the operation external characteristics of inertia, damping characteristic, active frequency modulation, reactive voltage regulation characteristic and the like of synchronous machine set grid-connected operation. The conventional power system synchronous generator can absorb or release energy through the change of the rotation speed of a rotor to maintain the stable frequency of the system. The larger the rotational inertia of the system is, the slower the frequency change is, and the inertia is an important guarantee for the stable operation of the system. Wind power and photovoltaic power gradually replace a traditional synchronous generator to become a main energy source, so that the rotational inertia is reduced, and meanwhile, the output of the wind power and the photovoltaic power has obvious intermittence and fluctuation, so that the stability of a power system is reduced. The rotational inertia of the power system can be increased by simulating a traditional generator through the energy storage unit. The electrochemical energy storage enables the inverter to have the external characteristics similar to those of a synchronous generator through a Virtual Synchronous Generator (VSG), namely a mode of simulating kinetic energy change of a rotor through charging and discharging, and provides rotational inertia for a power system.
In addition, for monitoring and controlling the synchronous generator and the converter in the embodiment of the invention, the operation parameters required to be related in the operation process comprise the power angle, the angular velocity, the inertia constant, the damping coefficient, the mechanical power, the electromagnetic power and the like of the synchronous generator; the virtual power angle, the virtual angular velocity, the virtual inertia constant, the virtual damping coefficient, the instruction power, the output power and the like of the converter, and the rated angular velocity and other parameters of the power grid related to the operation of the power grid, the synchronous generator and the converter. The operation parameters acquired in the embodiment of the present invention may include some or all of the above parameters, or include other parameters not mentioned above, and the like.
And S120, respectively establishing transient models of the synchronous generator and the converter based on the operation parameters.
The transient models of the synchronous generator and the converter established in the embodiment of the invention mainly refer to the characteristics that the load active power and reactive power of a power system change along with the voltage and the frequency when the voltage and the frequency of the system change rapidly. And (3) considering the mutual influence of factors such as power angle, angular velocity, inertia constant, damping coefficient, power and the like of the synchronous generator and the converter in the operation process, and establishing a transient model of the synchronous generator and the converter.
S130, solving the transient models of the synchronous generator and the converters by taking the minimum total inertia of the power grid as a target to obtain the virtual inertia and the virtual damping coefficient of each converter.
In the embodiment of the invention, the transient model established in the previous step is solved by taking the minimum total inertia of the power grid as an optimization target and taking the virtual inertia and the virtual damping coefficient of the converter as optimization variables, so as to obtain the virtual inertia and the virtual damping coefficient of each converter meeting the minimum total inertia of the power grid as the target.
And S140, setting each converter based on the virtual inertia and the virtual damping coefficient.
In the embodiment of the invention, the operation parameters of the synchronous generator and the converters in the power grid are obtained, then the transient models of the synchronous generator and the converters are established, the transient models are solved by taking the minimum total inertia of the power grid as a target, the virtual inertia and the virtual damping coefficient of each converter are obtained, the virtual inertia and the virtual damping coefficient of each converter can be obtained from the global angle of the power grid, the stability of the whole power grid is ensured, and the frequency stability and the transient power angle stability of the power grid under the fault condition are ensured.
In an embodiment of the present invention, S120 may include:
s121, constructing a generator transient model of the synchronous generator based on the operation parameters of the synchronous generator;
s122, constructing a converter transient model of the converter based on the operation parameters of the converter;
and S123, constructing a system power flow equation of the power grid based on the transient model of the generator and the transient model of the converter.
Wherein S121 may establish a generator transient model of the synchronous generator based on the following formula:
wherein, delta Gi Is the power angle, w, of the ith synchronous generator 0 The rated angular speed of the power grid; w is a Gi The angular speed of the ith synchronous generator; h Gi The inertia constant of the ith synchronous generator is obtained; d Gi The damping coefficient of the ith synchronous generator is set; p mGi The mechanical power of the ith synchronous generator; p eGi The electromagnetic power of the ith synchronous generator; e' Gi Transient potential of the ith synchronous generator; x is the number of Gi Transient reactance of the ith synchronous generator; e.g. of the type Gi、 f Gi The real part and the imaginary part of the voltage of the ith synchronous generator are respectively.
Wherein, S122 may include:
establishing a converter transient model of the converter based on the following formula:
wherein, delta xi Is the virtual power angle, w, of the ith converter 0 The rated angular speed of the power grid; w is a Xi The virtual angular speed of the ith converter is obtained; h Xi The virtual inertia constant of the ith converter is obtained; d Xi The virtual damping coefficient of the ith converter is obtained; p mXi The command power of the ith converter is obtained; p emXi The output power of the ith converter is obtained; g is a control model of the converter, U xi The port voltage of the f-th converter is obtained; i is Xi Is the port current of the ith converter.
Wherein, S123 may include:
establishing a system power flow equation of the power grid based on the following formula:
0＝g(x，y)
wherein g is a system power flow equation; x is a differential state variable of the transient model of the generator and the transient model of the converter, and y is a node voltage current algebraic variable.
Optionally, S130 may calculate the virtual inertia and the virtual damping coefficient of each converter based on the following formulas:
wherein minHt otal Is the minimum total inertia of the grid; NG is the number of synchronous generators; NX is the number of current transformers; s Gi The rated power of the ith synchronous generator; s Xi The rated power of the ith converter.
Further, the power angle of the system may be defined accordingly, for example:
wherein, delta min 、δ max Respectively the upper and lower limits of the power angle.
The frequency rate of change of the system is defined, for example:
wherein ROOF max Is the maximum frequency rate of change of the system, f 0 For a rated frequency, Δ P is the amount of system power imbalance after a large disturbance occurs.
The system center frequency deviation is constrained, for example:
wherein f is min、 f max Upper and lower limits of the system frequency, respectively, f Gi Frequency of the ith synchronous generator, f Xi Is the virtual frequency of the ith converter.
The inertia constant and damping coefficient of the system are constrained, for example:
wherein H min、 H max Lower and upper inertia constants, D min 、D max The upper and lower limits of the damping coefficient.
In an embodiment of the invention, a genetic algorithm may be used to jointly solve the transient models of the synchronous generator and the converter.
Example two
Fig. 2 is a schematic structural diagram of a virtual synchronization control apparatus for a power grid according to a third embodiment of the present invention. As shown in fig. 2, the apparatus includes an obtaining module 21, a building module 22, a calculating module 23, and an executing module 24, wherein:
the acquisition module 21 is configured to perform acquisition of operating parameters of a synchronous generator and a converter in a power grid;
an establishing module 22 for performing the establishing of transient models of the synchronous generator and the converter, respectively, based on the operating parameters;
the calculation module 23 is configured to perform solution on the transient models of the synchronous generator and the converters with the minimum total inertia of the power grid as a target, so as to obtain virtual inertia and virtual damping coefficients of each converter;
and the execution module 24 is used for executing the setting of each converter based on the virtual inertia and the virtual damping coefficient.
The setup module 22 may include:
the generator unit is used for executing the construction of a generator transient model of the synchronous generator based on the operation parameters of the synchronous generator;
the converter unit is used for constructing a converter transient model of the converter based on the operation parameters of the converter;
and the system unit is used for executing a system power flow equation for constructing the power grid based on the transient model of the generator and the transient model of the converter.
The generator unit includes:
a generator transient model of the synchronous generator is established based on the following formula:
wherein, delta Gi Is the power angle, w, of the ith synchronous generator 0 The rated angular speed of the power grid; w is a Gi The angular speed of the ith synchronous generator; h Gi The inertia constant of the ith synchronous generator is obtained; d Gi The damping coefficient of the ith synchronous generator is set; p mGi The mechanical power of the ith synchronous generator; p eGi The electromagnetic power of the ith synchronous generator; e' Gi Transient potential of the ith synchronous generator; x is the number of Gi Transient reactance of the ith synchronous generator; e.g. of the type Gi、 f Gi The real part and the imaginary part of the voltage of the ith synchronous generator are respectively.
The converter unit includes:
establishing a converter transient model of the converter based on the following formula:
wherein, delta xi Is the virtual power angle, w, of the ith converter 0 The rated angular speed of the power grid; w is a Xi The virtual angular speed of the ith converter is obtained; h Xi The virtual inertia constant of the ith converter is obtained; d X i is a virtual damping coefficient of the ith converter; p mXi The command power of the ith converter is obtained; p eXi The output power of the ith converter is obtained; g is a control model of the converter, U Xi The port voltage of the ith converter is obtained; i is Xi Is the port current of the ith converter.
The system unit includes:
establishing a system power flow equation of the power grid based on the following formula:
0＝g(x，y)
wherein/g is a system power flow equation; x is a differential state variable of a generator transient model and a converter transient model, and y is a node voltage current algebraic variable.
The calculation module comprises:
calculating the virtual inertia and the virtual damping coefficient of each converter based on the following formulas:
wherein minHt otal Is the minimum total inertia of the grid; NG is the number of synchronous generators; NX is the number of current transformers; s Gi The rated power of the ith synchronous generator; s Xi The rated power of the ith converter.
In the embodiment of the invention, the transient models of the synchronous generator and the converter are jointly solved by adopting a genetic algorithm.
The power grid virtual synchronous control device provided by the embodiment of the invention can execute the power grid virtual synchronous control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 3 shows a schematic structural diagram of a grid virtual synchronization control device 10 that can be used to implement an embodiment of the invention. The grid virtual synchronization control apparatus is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 3, the grid virtual synchronization control apparatus 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, and the like, where the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from a storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data necessary for the operation of the electronic apparatus 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
A plurality of components in the grid virtual synchronization control apparatus 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, or the like; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, or the like. The processor 11 performs the various methods and processes described above, such as the grid virtual synchronization control method.
In some embodiments, the grid virtual synchronization control method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the above described grid virtual synchronization control method may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the grid virtual synchronization control method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a 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 the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A virtual synchronization control method for a power grid is characterized by comprising the following steps:
acquiring operating parameters of a synchronous generator and a converter in a power grid;
establishing transient models of the synchronous generator and the converter respectively based on the operation parameters;
solving the transient models of the synchronous generator and the converters with the minimum total inertia of the power grid as a target to obtain virtual inertia and virtual damping coefficients of the converters;
and setting each converter based on the virtual inertia and the virtual damping coefficient.
2. The grid virtual synchronization control method according to claim 1, wherein the establishing transient models of the synchronous generator and the converter based on the operating parameters, respectively, comprises:
constructing a generator transient model of the synchronous generator based on the operating parameters of the synchronous generator;
constructing a converter transient model of the converter based on the operating parameters of the converter;
and constructing a system power flow equation of the power grid based on the generator transient model and the converter transient model.
3. The grid virtual synchronization control method according to claim 2, wherein the building a generator transient model of the synchronous generator based on the operating parameters of the synchronous generator comprises:
establishing a generator transient model of the synchronous generator based on the following equation:
wherein, delta Gi For the power angle, w, of the synchronous generator of station i 0 Is the rated angular speed of the power grid; w is a Gi The angular speed of the ith synchronous generator; h Gi The inertia constant of the ith synchronous generator is obtained; d Gi The damping coefficient of the ith synchronous generator is set; p mGi Mechanical power of the i-th synchronous generator; p is eGi Electromagnetic power for the ith said synchronous generator; e' Gi Transient potential of the ith synchronous generator; x is the number of Gi Transient reactance of the ith synchronous generator; e.g. of the type Gi 、f Gi The real part and the imaginary part of the voltage of the ith synchronous generator are respectively.
4. The grid virtual synchronization control method according to claim 2, wherein the constructing a converter transient mode of the converter based on the operating parameters of the converter comprises:
establishing a converter transient model of the converter based on the following formula:
wherein, delta Xi Is the virtual power angle, w, of the i-th said converter 0 Is the rated angular speed of the power grid; w is a Xi The virtual angular speed of the ith converter is obtained; h Xi The virtual inertia constant of the ith converter is obtained; d Xi The virtual damping coefficient of the ith converter is set; p mXi The command power of the ith converter is obtained; p eXi The output power of the ith converter is obtained; g is a control model of the converter, U Xi The port voltage of the ith converter is the port voltage of the ith converter; i is Xf The port current of the f-th current transformer is obtained.
5. The grid virtual synchronization control method according to claim 2, wherein the constructing a system power flow equation of the grid based on the generator transient model and the converter transient model comprises:
establishing a system power flow equation of the power grid based on the following formula:
0＝g(x，y)
wherein g is a system power flow equation; x is a differential state variable of the generator transient model and the converter transient model, and y is a node voltage current algebraic variable.
6. The method according to claim 1, wherein the solving the transient models of the synchronous generator and the converters to obtain the virtual inertia and the virtual damping coefficient of each converter with the aim of minimizing the total inertia of the grid comprises:
calculating the virtual inertia and the virtual damping coefficient of each converter based on the following formulas:
wherein, min H total Is a minimum total inertia of the grid; NG is the number of the synchronous generators; NX is the number of the current transformers; s. the Gi Rated power of the ith synchronous generator; s Xi The rated power of the current transformer of the ith station.
7. The grid virtual synchronization control method according to claim 6, wherein the transient models of the synchronous generator and the converter are jointly solved using a genetic algorithm.
8. A virtual synchronization control device of a power grid is characterized by comprising:
the acquisition module is used for acquiring the operating parameters of the synchronous generator and the converter in the power grid;
an establishing module for performing respective establishment of transient models of the synchronous generator and the converter based on the operating parameters;
the calculation module is used for solving the transient models of the synchronous generator and the converters by taking the minimum total inertia of the power grid as a target to obtain the virtual inertia and the virtual damping coefficient of each converter;
and the execution module is used for executing the setting of each converter based on the virtual inertia and the virtual damping coefficient.
9. A virtual synchronization control device for a power grid, the device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the power grid virtual synchronization control method of any of claims 1-7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions for causing a processor to implement the grid virtual synchronization control method of any of claims 1-7 when executed.
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