CN109347119B - Virtual synchronous generator-based power grid low-frequency oscillation suppression method and device - Google Patents
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Abstract
The invention discloses a virtual synchronous generator-based power grid low-frequency oscillation suppression method and device, wherein the virtual synchronous generator-based power grid low-frequency oscillation suppression method comprises the following steps: acquiring actual output power of a current virtual synchronous generator; judging whether the current virtual synchronous generator generates low-frequency oscillation or not; and if the current virtual synchronous generator generates low-frequency oscillation, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid. By monitoring the actual output power of the virtual synchronous generator in real time, when the virtual synchronous generator generates low-frequency oscillation, the damping coefficient or the rotational inertia is adjusted in time to restrain the low-frequency oscillation, so that potential safety hazards of a power grid caused by continuous low-frequency oscillation of the actual output power of the power grid can be prevented, and the stability of the power grid is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a virtual synchronous generator-based power grid low-frequency oscillation suppression method, a virtual synchronous generator-based power grid low-frequency oscillation suppression device, power equipment and a computer-readable storage medium.
Background
With the increasing prominence of energy problems and environmental pollution problems, power systems are shifting from being dominated by conventional rotating electrical machines to being dominated by complex systems dominated by new power electronics. In the safe operation of the whole power system, the rotational inertia and the damping characteristic of the traditional synchronous generator playing a key role are gradually disappeared, so that the stability of the power system is deteriorated, and a serious threat is caused. Under the background, the grid-connected equipment based on the virtual synchronous generator becomes a research hotspot in the global power industry, the technology can completely simulate the external characteristics of the traditional synchronous generator, has virtual rotary inertia and increases the system stability.
However, since the grid-connected devices of the virtual synchronous generators run in parallel through the transmission line, when the system is disturbed, the rotors of the generators swing relatively, and if the damping of the system is relatively weak, the actual output power of the power system oscillates continuously, and the oscillation frequency is generally 0.1-2.5 Hz, so that the oscillation is called as low-frequency oscillation. Although the low-frequency oscillation is not so serious as short circuit or open circuit faults, once the system generates the low-frequency oscillation, hidden dangers are left for the safe and stable operation of a power grid, the system disconnection can be caused in serious conditions, large-area power failure accidents are caused, and therefore huge economic losses are caused. Therefore, the problem of suppressing the low-frequency oscillation of the power grid and improving the stability of the power grid is to be solved urgently.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to solve the problem in the prior art that a power grid based on power electronics may generate continuous low-frequency oscillation and have poor stability, and to provide a method for suppressing the low-frequency oscillation of the power grid.
To this end, according to a first aspect, the present invention provides a virtual synchronous generator-based power grid low-frequency oscillation suppression method, including the following steps: acquiring actual output power of a current virtual synchronous generator; judging whether the current virtual synchronous generator generates low-frequency oscillation or not; and if the current virtual synchronous generator generates low-frequency oscillation, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid.
Optionally, the virtual synchronous generator-based grid low-frequency oscillation suppression method further includes the following steps: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, adjusting the rotational inertia of the current virtual synchronous generator according to the mathematical model.
Optionally, the virtual synchronous generator-based grid low-frequency oscillation suppression method further includes the following steps: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, outputting error reporting information of the fault of the current virtual synchronous generator.
Optionally, the current virtual synchronous generator oscillates at a low frequency when a periodic disturbance between 0.1Hz and 2.5Hz occurs in the actual output power of the current virtual synchronous generator.
Optionally, the mathematical model of the power grid is:
wherein n is the nth virtual synchronous generator, JnIs the rotational inertia of the nth virtual synchronous generator, DnRefers to the damping coefficient, omega, of the nth virtual synchronous generatornRefers to the electrical angular velocity, T, of the nth virtual synchronous generatormnRefers to the mechanical torque, T, of the nth virtual synchronous generatorenRefers to the electromagnetic torque, omega, of the nth virtual synchronous generator0Refers to the synchronous angular velocity of the grid.
Alternatively, when the actual output power of the current virtual synchronous generator oscillates at a low frequency,
wherein, T0nRefers to the mechanical torque set value, delta T, of the nth virtual synchronous generatornMeans the mechanical power deviation given value, T, of the nth virtual synchronous generatorOsillationIs a torque input component, P, which suppresses low frequency oscillationsref,nRefers to the rated output power, k, of the virtual synchronous generatorfnIs the frequency proportionality coefficient, f, of the nth virtual synchronous generator0Is the rated frequency, fnIs referred to as the nominal frequency, kΔpnIs the proportional coefficient of the power disturbance change rate of the nth virtual synchronous generatornRefers to the actual output power of the virtual synchronous generator.
According to a second aspect, the invention provides a virtual synchronous generator-based grid low-frequency oscillation suppression device, comprising: the power acquisition module is used for acquiring the actual output power of the current virtual synchronous generator; the first judgment module is used for judging whether the current virtual synchronous generator generates low-frequency oscillation; the first adjusting module is used for adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid.
Optionally, the virtual synchronous generator-based grid low-frequency oscillation suppression device further includes: the second judgment module is used for judging whether the current virtual synchronous generator still has low-frequency oscillation; and the second adjusting module is used for adjusting the moment of inertia of the current virtual synchronous generator according to the mathematical model.
Optionally, the virtual synchronous generator-based grid low-frequency oscillation suppression device further includes: the third judgment module is used for judging whether the current virtual synchronous generator still has low-frequency oscillation; and the error reporting module is used for outputting error reporting information of the current virtual synchronous generator which fails.
According to a third aspect, the invention provides an electrical device comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method according to any one of the first aspect.
According to a fourth aspect, the invention provides a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the method according to any one of the first aspect.
The technical scheme provided by the embodiment of the invention has the following advantages:
1. the invention provides a virtual synchronous generator-based power grid low-frequency oscillation suppression method, which comprises the following steps of: acquiring actual output power of a current virtual synchronous generator; judging whether the current virtual synchronous generator generates low-frequency oscillation or not; and if the current virtual synchronous generator generates low-frequency oscillation, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid. By monitoring the actual output power of the virtual synchronous generator in real time, when the virtual synchronous generator generates low-frequency oscillation, the damping coefficient is adjusted in time to inhibit the low-frequency oscillation, so that potential safety hazards of a power grid caused by continuous low-frequency oscillation of the actual output power of the power grid can be prevented, and the stability of the power grid is improved.
2. The invention provides a virtual synchronous generator-based power grid low-frequency oscillation suppression method, which further comprises the following steps: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, adjusting the rotational inertia of the current virtual synchronous generator according to the mathematical model. When the damping coefficient is adjusted and the current virtual synchronous generator still has low-frequency oscillation, the rotational inertia of the current virtual synchronous generator is adjusted to inhibit the low-frequency oscillation, so that potential safety hazards of a power grid caused by continuous low-frequency oscillation of actual output power of the power grid can be further prevented, and the stability of the power grid is improved.
3. The invention provides a virtual synchronous generator-based power grid low-frequency oscillation suppression method, which further comprises the following steps: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, outputting error reporting information of the fault of the current virtual synchronous generator. When the virtual synchronous generator generates low-frequency oscillation and the damping coefficient and the rotational inertia are adjusted simultaneously according to the mathematical model and the actual output power of the virtual synchronous generator, the virtual synchronous generator has a fault when the low-frequency oscillation still exists, the fault is possibly output in time, the fault reporting information can be output to remind a user of troubleshooting, the safe and stable operation of the power grid is prevented from being influenced greatly, and the stability of the power grid is further improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for suppressing low-frequency oscillation of a virtual synchronous generator-based power grid according to embodiment 1;
fig. 2 is a main circuit topology diagram of a virtual synchronous generator provided in embodiment 1;
fig. 3 is a schematic structural diagram of a virtual synchronous generator-based grid low-frequency oscillation suppression device provided in embodiment 2;
fig. 4 is a schematic diagram of a hardware structure of the power device provided in embodiment 3.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
The embodiment provides a virtual synchronous generator-based power grid low-frequency oscillation suppression method, as shown in fig. 1. It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein. The process comprises the following steps:
and step S100, acquiring the actual output power of the current virtual synchronous generator.
And step S200, judging whether the current virtual synchronous generator generates low-frequency oscillation. In this embodiment, whether the current virtual synchronous generator generates low-frequency oscillation is determined by determining whether a difference between the actual output power and the rated output power of the current virtual synchronous generator generates periodic disturbance within a certain frequency, specifically, when the actual output power of the current virtual synchronous generator generates periodic disturbance between 0.1Hz and 2.5Hz, the current virtual synchronous generator generates low-frequency oscillation. In this embodiment, if the current virtual synchronous generator has low-frequency oscillation, step S300 is executed; if the current virtual synchronous generator does not generate low-frequency oscillation, the actual output power of the current virtual synchronous generator is continuously obtained, the operation condition of the current virtual synchronous generator is monitored, and the step S100 is continuously executed.
And step S300, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid.
In the present embodiment, the main circuit topology of the virtual synchronous generator is shown in fig. 2, and the virtual synchronous generator includes: the three-phase inverter bridge is composed of Q1-Q6, and an LCL type filter is composed of an inverter side inductor L1, a filter capacitor C and a network side inductor L2.
The mechanical motion equation expression of the virtual synchronous generator rotor is as follows:
wherein J is the moment of inertia of the synchronous generator in kg.m2(ii) a Under the condition that the number of pole pairs is 1, the mechanical angular velocity omega of the synchronous generator is the electrical angular velocity; omega0Is the synchronous angular velocity of the power grid, rad/s; t ism、Te、TdMechanical, electromagnetic and damping torques of the synchronous generator are respectively N.m; d is damping coefficient, N.m.s/rad. T ismProvided by a prime mover; t iseCan be calculated from the virtual synchronous generator potential and the output current.
Thus, the mathematical model of the grid is:
wherein n is the nth virtual synchronous generator, JnIs the rotational inertia of the nth virtual synchronous generator, DnRefers to the damping coefficient, omega, of the nth virtual synchronous generatornRefers to the electrical angular velocity, T, of the nth virtual synchronous generatormnRefers to the mechanical torque, T, of the nth virtual synchronous generatorenRefers to the electromagnetic torque, omega, of the nth virtual synchronous generator0Refers to the synchronous angular velocity of the grid.
In this embodiment, when the actual output power of the current virtual synchronous generator oscillates at a low frequency, the damping coefficient of the current virtual synchronous generator is adjusted according to the mathematical model of the power grid and the following formula:
wherein, T0nRefers to the mechanical torque set value, delta T, of the nth virtual synchronous generatornMeans the mechanical power deviation given value, T, of the nth virtual synchronous generatorOsillationIs a torque input component, P, which suppresses low frequency oscillationsref,nRefers to the rated output power, k, of the virtual synchronous generatorfnIs the frequency proportionality coefficient, f, of the nth virtual synchronous generator0Is the rated frequency, fnIs referred to as the nominal frequency, kΔpnIs the proportional coefficient of the power disturbance change rate of the nth virtual synchronous generatornRefers to the actual output power of the virtual synchronous generator. In a particular embodiment, kfnAnd kΔpnThe magnitude of (b) is adjusted according to the rated frequency and the magnitude of the rated output power of the current virtual synchronous generator, and the like, without any limitation.
In this embodiment, it should be noted that the above equations (1) and (2) can also be used to generate frequency oscillation in the virtual synchronous generator, i.e. the actual frequency f of the virtual synchronous generatornTo the rated frequency f0And when the damping coefficient and/or the virtual inertia of the virtual synchronous generator is larger than the preset threshold value, adjusting the damping coefficient and/or the virtual inertia of the virtual synchronous generator so as to inhibit the frequency oscillation of the virtual synchronous generator and enable the power grid to stably operate.
According to the method for suppressing the low-frequency oscillation of the power grid based on the virtual synchronous generator, the actual output power of the virtual synchronous generator is monitored in real time, and when the low-frequency oscillation occurs, the damping coefficient is adjusted in time to suppress the low-frequency oscillation, so that potential safety hazards of the power grid caused by continuous low-frequency oscillation of the actual output power of the power grid can be prevented, and the stability of the power grid is improved.
In an optional embodiment, as shown in fig. 1, the method for suppressing low-frequency oscillation of a power grid based on a virtual synchronous generator provided in this embodiment further includes the following steps:
and step S400, judging whether the current virtual synchronous generator still has low-frequency oscillation. The method for determining low frequency oscillation in this embodiment is the same as the method for determining in step S200, and is not described herein again. In this embodiment, if there is still low-frequency oscillation occurring in the current virtual synchronous generator, step S500 is executed; if the low-frequency oscillation of the current virtual synchronous generator is successfully suppressed, continuously acquiring the actual output power of the current virtual synchronous generator, and monitoring the operation condition of the current virtual synchronous generator, namely continuously executing the step S100.
And S500, adjusting the moment of inertia of the current virtual synchronous generator according to the mathematical model. In this embodiment, again according to the grid model
And adjusting the rotational inertia or the damping coefficient of the current virtual synchronous generator by using the formula (1) and the formula (2).
According to the method for suppressing the low-frequency oscillation of the power grid based on the virtual synchronous generator, when the damping coefficient is adjusted and the current virtual synchronous generator still has low-frequency oscillation, the rotational inertia of the current virtual synchronous generator is adjusted to suppress the low-frequency oscillation, so that potential safety hazards of the power grid caused by continuous low-frequency oscillation of the actual output power of the power grid can be further prevented, and the stability of the power grid is improved.
In an alternative embodiment, as shown in fig. 1, the following steps are further included after step S500:
and step S600, judging whether the current virtual synchronous generator still has low-frequency oscillation. In this embodiment, if the low-frequency oscillation still exists in the current virtual synchronous generator, step S700 is executed; if the current virtual synchronous generator does not generate low-frequency oscillation, the actual frequency of the current virtual synchronous generator is continuously obtained, the running condition of the current virtual synchronous generator is monitored, and the step S100 is continuously executed.
And step S700, outputting error reporting information of the current virtual synchronous generator which has a fault. In this embodiment, when the virtual synchronous generator generates low-frequency oscillation and the damping coefficient and the rotational inertia are adjusted according to the mathematical model and the actual output power of the virtual synchronous generator, the low-frequency oscillation of the virtual synchronous generator still exists, which has a high possibility that the virtual synchronous generator itself fails, and the user can be reminded to troubleshoot by outputting error reporting information in time, thereby preventing the safe and stable operation of the power grid from being affected more, and further improving the stability of the power grid.
Example 2
In this embodiment, a virtual synchronous generator-based power grid low-frequency oscillation suppression device is provided, which is used to implement the foregoing embodiment 1 and the preferred embodiments thereof, and the description of the device that has been already made is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The virtual synchronous generator-based grid low-frequency oscillation suppression device provided by this embodiment, as shown in fig. 3, includes: the power acquisition module 100, the first judgment module 200 and the first adjustment module 300.
The power obtaining module 100 is configured to obtain an actual output power of a current virtual synchronous generator; the first judging module 200 is configured to judge whether the current virtual synchronous generator generates low-frequency oscillation; the first adjusting module 300 is configured to adjust a damping coefficient of the current virtual synchronous generator according to a mathematical model of the power grid.
In an alternative embodiment, as shown in fig. 3, the virtual synchronous generator-based grid low-frequency oscillation suppression device further includes: a second determination module 400 and a second adjustment module 500.
The second judging module 400 is configured to judge whether the current virtual synchronous generator still has low-frequency oscillation; the second adjusting module 500 is configured to adjust the moment of inertia of the current virtual synchronous generator according to the mathematical model.
In an optional embodiment, the virtual synchronous generator based grid low frequency oscillation suppression device further comprises: a third judging module and an error reporting module.
The third judging module is used for judging whether the current virtual synchronous generator still has low-frequency oscillation; the error reporting module is used for outputting error reporting information of the current virtual synchronous generator which fails.
In an alternative embodiment, the current virtual synchronous generator oscillates at a low frequency when a periodic disturbance between 0.1Hz and 2.5Hz occurs in the actual output power of the current virtual synchronous generator.
In an alternative embodiment, the mathematical model of the grid is:
wherein n is the nth virtual synchronous generator, JnIs the rotational inertia of the nth virtual synchronous generator, DnRefers to the damping coefficient, omega, of the nth virtual synchronous generatornRefers to the electrical angular velocity, T, of the nth virtual synchronous generatormnRefers to the mechanical torque, T, of the nth virtual synchronous generatorenRefers to the electromagnetic torque, omega, of the nth virtual synchronous generator0Refers to the synchronous angular velocity of the grid.
In an alternative embodiment, when the actual output power of the current virtual synchronous generator oscillates at a low frequency,
wherein, T0nRefers to the mechanical torque set value, delta T, of the nth virtual synchronous generatornMeans the mechanical power deviation given value, T, of the nth virtual synchronous generatorOsillationIs a torque input component, P, which suppresses low frequency oscillationsref,nRefers to the rated output power, k, of the virtual synchronous generatorfnIs the frequency proportionality coefficient, f, of the nth virtual synchronous generator0Is the rated frequency, fnIs referred to as the nominal frequency, kΔpnIs the proportional coefficient of the power disturbance change rate of the nth virtual synchronous generatornRefers to the actual output power of the virtual synchronous generator.
Example 3
An embodiment of the present invention further provides an electrical device, as shown in fig. 4, the electrical device may include: at least one processor 401, such as a CPU (Central Processing Unit), at least one communication interface 403, memory 404, and at least one communication bus 402. Wherein a communication bus 402 is used to enable connective communication between these components. The communication interface 403 may include a Display (Display) and a Keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a standard wireless interface. The Memory 404 may be a high-speed RAM Memory (volatile Random Access Memory) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 404 may optionally be at least one memory device located remotely from the processor 401. Wherein the memory 404 stores an application program and the processor 401 invokes the program code stored in the memory 404 for performing any of the method steps of embodiment 1, i.e. for performing the following operations:
acquiring actual output power of a current virtual synchronous generator; judging whether the current virtual synchronous generator generates low-frequency oscillation or not; and if the current virtual synchronous generator generates low-frequency oscillation, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid.
In this embodiment of the present invention, the processor 401 calls the program code in the memory 404, and is further configured to perform the following operations: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, adjusting the rotational inertia of the current virtual synchronous generator according to the mathematical model.
In this embodiment of the present invention, the processor 401 calls the program code in the memory 404, and is further configured to perform the following operations: judging whether the current virtual synchronous generator still has low-frequency oscillation; and if the current virtual synchronous generator still has low-frequency oscillation, outputting error reporting information of the fault of the current virtual synchronous generator.
The communication bus 402 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus 402 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one line is shown in FIG. 4, but it is not intended that there be only one bus or one type of bus.
The memory 404 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (english: non-volatile memory), such as a flash memory (english: flash memory), a hard disk (english: hard disk drive, abbreviated: HDD) or a solid-state drive (english: SSD); the memory 404 may also comprise a combination of memories of the kind described above.
The processor 401 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 401 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
Example 4
An embodiment of the present invention further provides a non-transitory computer storage medium, where the computer storage medium stores computer-executable instructions, and the computer-executable instructions can execute any one of the method steps in embodiment 1. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A virtual synchronous generator-based power grid low-frequency oscillation suppression method is characterized by comprising the following steps:
acquiring actual output power of a current virtual synchronous generator;
judging whether the current virtual synchronous generator generates low-frequency oscillation or not;
if the current virtual synchronous generator generates low-frequency oscillation, adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid;
the mathematical model of the power grid is as follows:
wherein n is the nth virtual synchronous generator, JnIs the rotational inertia of the nth virtual synchronous generator, DnRefers to the damping coefficient, omega, of the nth virtual synchronous generatornRefers to the electrical angular velocity, T, of the nth virtual synchronous generatormnRefers to the mechanical torque, T, of the nth virtual synchronous generatorenRefers to the electromagnetic torque, omega, of the nth virtual synchronous generator0Refers to the synchronous angular velocity of the power grid;
when the actual output power of the current virtual synchronous generator oscillates at a low frequency,
wherein, T0nRefers to the mechanical torque set value, delta T, of the nth virtual synchronous generatornMeans the mechanical power deviation given value, T, of the nth virtual synchronous generatorOsillationIs a torque input component, P, which suppresses low frequency oscillationsref,nRefers to the rated output power, k, of the virtual synchronous generatorfnIs the frequency proportionality coefficient, f, of the nth virtual synchronous generator0Is the rated frequency, fnRefers to the actual frequency, kΔpnIs the proportional coefficient of the power disturbance change rate of the nth virtual synchronous generatornRefers to the actual output power of the virtual synchronous generator.
2. The virtual synchronous generator-based grid low-frequency oscillation suppression method according to claim 1, further comprising the following steps:
judging whether the current virtual synchronous generator still has low-frequency oscillation;
and if the current virtual synchronous generator still has low-frequency oscillation, adjusting the moment of inertia of the current virtual synchronous generator according to the mathematical model.
3. The virtual synchronous generator-based grid low-frequency oscillation suppression method according to claim 2, further comprising the following steps:
judging whether the current virtual synchronous generator still has low-frequency oscillation;
and if the current virtual synchronous generator still has low-frequency oscillation, outputting error reporting information of the fault of the current virtual synchronous generator.
4. The virtual synchronous generator-based power grid low-frequency oscillation suppression method according to any one of claims 1-3, wherein the current virtual synchronous generator generates low-frequency oscillation when the actual output power of the current virtual synchronous generator generates periodic disturbance between 0.1Hz and 2.5 Hz.
5. A virtual synchronous generator-based power grid low-frequency oscillation suppression device is characterized by comprising:
the power acquisition module is used for acquiring the actual output power of the current virtual synchronous generator;
the first judgment module is used for judging whether the current virtual synchronous generator generates low-frequency oscillation or not;
the first adjusting module is used for adjusting the damping coefficient of the current virtual synchronous generator according to the mathematical model of the power grid;
the mathematical model of the power grid is as follows:
wherein n is the nth virtual synchronous generator, JnIs the rotational inertia of the nth virtual synchronous generator, DnRefers to the damping coefficient, omega, of the nth virtual synchronous generatornRefers to the electrical angular velocity, T, of the nth virtual synchronous generatormnRefers to the mechanical torque, T, of the nth virtual synchronous generatorenRefers to the electromagnetic torque, omega, of the nth virtual synchronous generator0Refers to the synchronous angular velocity of the power grid;
when the actual output power of the current virtual synchronous generator oscillates at a low frequency,
wherein, T0nRefers to the mechanical torque set value, delta T, of the nth virtual synchronous generatornMeans the mechanical power deviation given value, T, of the nth virtual synchronous generatorOsillationIs a torque input component, P, which suppresses low frequency oscillationsref,nRefers to the rated output power, k, of the virtual synchronous generatorfnIs the frequency proportionality coefficient, f, of the nth virtual synchronous generator0Is the rated frequency, fnRefers to the actual frequency, kΔpnIs the proportional coefficient of the power disturbance change rate of the nth virtual synchronous generatornRefers to the actual output power of the virtual synchronous generator.
6. The virtual synchronous generator-based grid low-frequency oscillation suppression device according to claim 5, further comprising:
the second judgment module is used for judging whether the current virtual synchronous generator still has low-frequency oscillation;
and the second adjusting module is used for adjusting the moment of inertia of the current virtual synchronous generator according to the mathematical model.
7. The virtual synchronous generator-based grid low frequency oscillation suppression device according to claim 6, further comprising:
the third judging module is used for judging whether the current virtual synchronous generator still has low-frequency oscillation;
and the error reporting module is used for outputting error reporting information of the current virtual synchronous generator which fails.
8. An electrical device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of any one of claims 1-4.
9. A computer-readable storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the method of any of claims 1-4.
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