CN115566721A - Control method and system for enhancing transient stability of network-structured converter - Google Patents

Control method and system for enhancing transient stability of network-structured converter Download PDF

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CN115566721A
CN115566721A CN202211165721.9A CN202211165721A CN115566721A CN 115566721 A CN115566721 A CN 115566721A CN 202211165721 A CN202211165721 A CN 202211165721A CN 115566721 A CN115566721 A CN 115566721A
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type converter
transient stability
network
grid
enhancing
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司文佳
方旌扬
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Shandong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin

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Abstract

The invention belongs to the field of new energy power generation, and provides a control method and a control system for enhancing the transient stability of a network-type converter. The control method comprises the steps of controlling the phase of the network-type converter by adopting a VSM control strategy to obtain an active angle between the network-type converter and a power grid; the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network type converter is increased along with the increase of the active angle, and the transient stability of the network type converter is enhanced. By the design of the control method, the voltage of the system can be automatically increased when the system suffers from large disturbance, the capability of the network type converter for resisting the large disturbance is enhanced, and the transient stability of the network type converter is enhanced.

Description

Control method and system for enhancing transient stability of network-structured converter
Technical Field
The invention belongs to the field of new energy power generation, and particularly relates to a control method and a control system for enhancing transient stability of a network type converter.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The permeability of new energy in the power grid is continuously improved, and the ratio of the synchronous power supply is reduced. At present, a new energy unit is mainly connected with a grid through a grid-following type converter, and the grid-following type converter does not have the grid construction capability, and is low in inertia and small in damping. The high-occupancy ratio network-following type converter causes the fragility of an electric power system, reduces the stability and increases the risk of large-area power failure. Therefore, to address these challenges, the performance of the converter should be enhanced, driving the utility of grid-type converters in the power grid.
However, as the inventor knows, the networking inverter has the problems of transient stability, less related research, complex calculation of the research method, complex parameter adjustment and high implementation difficulty.
Disclosure of Invention
In order to solve the technical problems existing in the background art, the invention provides a control method and a system for enhancing the transient stability of a network type converter, wherein a new network type converter control structure is designed based on a Virtual Synchronous Machine (VSM) control strategy, and through the design of the control method, the voltage of the system can be automatically increased when the system is subjected to large disturbance, the capability of the network type converter for resisting the large disturbance is enhanced, and the transient stability of the network type converter is enhanced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a control method for enhancing the transient stability of a network type converter.
A control method for enhancing the transient stability of a network type converter comprises the following steps:
controlling the phase of the network-type converter by adopting a VSM control strategy to obtain an active angle between the network-type converter and a power grid;
the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network type converter is increased along with the increase of the active angle, and the transient stability of the network type converter is enhanced.
A second aspect of the present invention provides a control system for enhancing transient stability of a grid-type converter.
A control system for enhancing transient stability of a grid-type converter, comprising:
a VSM control module configured to: controlling the phase of the network construction type converter by adopting a VSM control strategy to obtain an active angle between the network construction type converter and a power grid;
an enhanced stabilization module configured to: the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network type converter is increased along with the increase of the active angle, and the transient stability of the network type converter is enhanced.
A third aspect of the invention provides a computer-readable storage medium.
A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps in the control method for enhancing the transient stability of a mesh-type converter according to the first aspect.
A fourth aspect of the invention provides a computer apparatus.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the control method for enhancing the transient stability of a network converter as described in the first aspect when executing the program.
Compared with the prior art, the invention has the beneficial effects that:
the control link provided by the invention can amplify the influence of the active angle and acts on the voltage controller, so that the voltage is increased along with the increase of the active angle, and the transient stability of the network type converter is further enhanced.
The invention can automatically raise the voltage when the system suffers from large disturbance through the design of the controller, and enhance the capability of the network-building type converter for resisting the large disturbance.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
Fig. 1 is a basic configuration diagram of a network converter according to an embodiment of the present invention;
FIG. 2 is a simplified model of a grid-type converter and a power grid according to an embodiment of the present invention;
FIG. 3 is a diagram of a VSM structure according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an equal area method for representing an acceleration area and a deceleration area in a power angle curve according to an embodiment of the present invention;
FIG. 5 is a logic diagram illustrating a control method for enhancing transient stability of a mesh-type converter according to an embodiment of the present invention;
fig. 6 is a diagram illustrating a comparison between an original system power-angle curve and a power-angle curve according to an embodiment of the present invention;
fig. 7 (a) shows the simulated converter voltage V under the stable condition (CCT =0.321 s) without using the method of the present invention in an embodiment of the present invention g Converter power P g And active angle delta g A waveform diagram of (a);
FIG. 7 (b) is a schematic diagram of an unstable condition (FCT) without the method of the present invention, according to an embodiment of the present invention>CCT, CCT =0.321 s) of the converter voltage V g Converter power P g And active angle delta g A waveform diagram of (a);
fig. 7 (c) shows the voltage V of the simulated converter under the stable condition (CCT =0.347 s) when the gain K is 1 according to the embodiment of the present invention g Converter power P g And active angle delta g A waveform diagram of (a);
fig. 7 (d) shows the voltage V of the simulated converter under the stable condition (CCT =0.394 s) when the gain K is 3 according to the embodiment of the present invention g Converter power P g And active angle delta g A waveform diagram of (c).
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It is noted that the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and systems according to various embodiments of the present disclosure. It should be noted that each block in the flowchart or block diagrams may represent a module, a segment, or a portion of code, which may comprise one or more executable instructions for implementing the logical function specified in the respective embodiment. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Example one
As shown in fig. 1, the embodiment provides a control method for enhancing the transient stability of a network-type converter, and the embodiment is exemplified by applying the method to a server, it is to be understood that the method may also be applied to a terminal, and may also be applied to a system including a terminal and a server, and is implemented by interaction between the terminal and the server. The server may be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing basic cloud computing services such as a cloud service, a cloud database, cloud computing, a cloud function, cloud storage, a network server, cloud communication, middleware service, a domain name service, a security service CDN, a big data and artificial intelligence platform, and the like. The terminal may be, but is not limited to, a smart phone, a tablet computer, a laptop computer, a desktop computer, a smart speaker, a smart watch, and the like. The terminal and the server may be directly or indirectly connected through wired or wireless communication, and the application is not limited herein. In this embodiment, the method includes the steps of:
controlling the phase of the network-type converter by adopting a VSM control strategy to obtain an active angle between the network-type converter and a power grid;
the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network configuration type converter is increased along with the increase of the active angle, and the transient stability of the network configuration type converter is enhanced.
The specific scheme of the embodiment can be realized by referring to the following contents:
1. establishing simplified 'network construction type converter-power network' model
Fig. 1 shows the basic structure of a mesh-type converter. The network-building type converter is connected with a power grid through an LCL filter. Implementing the capacitor voltage v by an internal voltage loop gfabc Control of (2); the resonance of the LCL filter is inhibited through an internal current loop, and the damping is increased; and controlling the output frequency and the phase of the network type converter through the external power loop.
Because the voltage control speed of the network type converter is high and the accuracy is accurate, the network type converter can be regarded as a controllable alternating voltage source. Typically, the grid is reduced to an alternating voltage source. Further, the impedance on the transmission line is generally considered to be purely inductive, with X gs The representation and the dynamics on the transmission line are ignored. Based on the above assumptions, a two-voltage source simplified model of the grid-type converter and the grid is built, as shown in fig. 2. Wherein, V g Indicating structureAmplitude of voltage, V, of network converter s The voltage amplitude of the power grid is represented, the phase of the converter is taken as a reference to take zero radian, and then the phase of the power grid is-delta g 。δ g Is the phase difference between the converter voltage and the grid voltage, also called the active angle. The converter and the network voltage are each represented as a voltage vector V g Angle 0 and V s ∠-δ g 。
The active power transferred from the converter to the grid can be expressed as:
Figure BDA0003861920360000061
the power control adopts a VSM control strategy of an analog synchronous machine. The VSM can provide inertia and damping for the transducers. The swing equation of VSM is shown in formula (1), wherein H g Is constant of inertia, D g Is the damping coefficient; p is a radical of formula g_ref_pu And p g_pu The unit values respectively represent an active reference value and an output power; omega 0 Is the nominal frequency, Δ ω pu Is the nominal value of the frequency variation.
Figure BDA0003861920360000062
Control structure of the VSM is shown in fig. 3.
2. Transient stability improving method through simplified model research
Transient stability is the ability of a system to maintain stable operation in the face of large disturbances. From equation (1), a power angle curve can be plotted, as shown in fig. 4. In the figure, a curve I, a curve II and a curve III respectively represent power angle curves before, during and after a fault. When the damping effect is neglected, the transient stability of the system can be described by the equal area method, i.e. the transient stability is equal to the acceleration area (S) in FIG. 4 a ) And the deceleration area (S) d ) In relation to this, reducing the acceleration area and increasing the deceleration area are the fundamental methods for improving the transient stability. Assume an active reference value P 0 The power angle curve in the figure 4 is raised without changing, so that the acceleration area can be reduced and the acceleration area can be increasedA deceleration area. According to the formula (1), the output voltage V of the converter is increased g The power output can be increased, and the height of the power angle curve can be improved.
3. Voltage automatic regulation controller design
As shown in fig. 4, when a fault occurs, the active angle reaches point b from point a, then the active angle increases, passes through points c and d, and finally returns at point e (when point e is on the left side of point f); when the point e and the point f coincide, the critical stable condition is obtained; when the point e crosses the point f, the active angle is increased continuously, and the system is unstable. It can be seen that the active angle continues to increase from point a to point e, i.e. delta g －δ 0 Is more than or equal to 0. Therefore, the active loop and voltage loop coupling part is designed according to the situation that the power angle is increased when the disturbance is large, as shown in fig. 5. K is a control element proposed in this embodiment, and is usually a proportional element, but may also be an integral, derivative or other common control element. The proposed control link can amplify the influence of the active angle and act on the voltage controller, so that the voltage is increased along with the increase of the active angle, and the transient stability of the network-type converter is further enhanced.
The value K is a fixed parameter and does not change, and when K =0, the control link proposed by the embodiment does not work, that is, the voltage does not increase with the increase of the active angle; when K is smaller, the voltage is slowly increased along with the increase of the power angle; when K is larger, the voltage is rapidly increased along with the increase of the power angle. The K value is set according to the rated voltage and the maximum voltage limit of the system and the voltage conversion range which can be borne by the system; usually, the control method is a proportional (P) element, but may also be a Proportional Integral (PI) element, a Proportional Integral Derivative (PID) element, or other common control elements. Wherein, P (proportion) is K; PI (proportional integral): k + 1/(T) i s); PID (proportional integral derivative): K + 1/(T) i s)+T d s。
With the controller designed in this embodiment, the power angle curve will change as shown in fig. 6. The invention has the following realization effects:
(1) At delta 0 And then, the height of the power angle curve is increased, the acceleration area is reduced, the deceleration area is increased, and the transient stability is improved.
(2) On the power angle curve, the part on the left side of the maximum power point is a stable area, and the right side of the maximum power point is an unstable area. By the control structure provided by the invention, the maximum power point of the power angle curve is shifted to the right, the stable area of the power angle curve is increased, and the static stability of the system is improved.
In particular, this embodiment is easy to implement and apply, in addition to achieving a good stability improvement effect.
4. Simulation result
The transient stability of the system is usually evaluated using a Critical Clearing Time (CCT). If the Fault-Clear Time (FCT) is greater than the CCT, the system will crash. Therefore, an increase in CCT means an increase in the transient stability of the system. The limit cutting time is the limit cutting time of the fault, namely the maximum time allowed for cutting the fault. When the fault is cut within the limit cutting time, the system can be kept stable, otherwise, the system is broken down.
The effect of the present embodiment was verified by simulation. The parameters and values involved in the simulation are shown in table 1.
TABLE 1 simulation parameters
Figure BDA0003861920360000081
Figure BDA0003861920360000091
FIGS. 7 (a) and 7 (b) show the transient stability level of the original system without the method of this embodiment. As shown in the simulation result, when the fault clearing time FCT is greater than the limit clearing time 0.321s, the system is unstable.
After using the control structure proposed in this embodiment, the simulation results are shown in fig. 7 (c) and fig. 7 (d). Fig. 7 (c) shows the effect when the coupling section gain K is 1, and fig. 7 (d) shows the effect when the coupling section gain K is 3. As can be seen from the graph, when K =1, the voltage output by the converter increases when the active angle is larger than the initial value, and the limit off time is increased from the original 0.321s to 0.347s when K = 1; the limit resection time was increased to 0.394s when K = 3. Therefore, the method provided by the embodiment strives for more time for fault removal after large disturbance, and enhances the transient stability of the system.
Example two
The embodiment provides a control system for enhancing the transient stability of a network type converter.
A control system for enhancing transient stability of a grid-type converter, comprising:
a VSM control module configured to: controlling the phase of the network construction type converter by adopting a VSM control strategy to obtain an active angle between the network construction type converter and a power grid;
an enhanced stabilization module configured to: the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network configuration type converter is increased along with the increase of the active angle, and the transient stability of the network configuration type converter is enhanced.
It should be noted that, the VSM control module and the enhanced stabilization module are the same as those of the first embodiment, but are not limited to the disclosure of the first embodiment. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer executable instructions.
EXAMPLE III
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps in the control method for enhancing the transient stability of a mesh-type converter as described in the first embodiment above.
Example four
The present embodiment provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps in the control method for enhancing transient stability of a mesh-type converter as described in the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or 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 control method for enhancing transient stability of a network-type converter is characterized by comprising the following steps:
controlling the phase of the network construction type converter by adopting a VSM control strategy to obtain an active angle between the network construction type converter and a power grid;
the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network configuration type converter is increased along with the increase of the active angle, and the transient stability of the network configuration type converter is enhanced.
2. The control method for enhancing transient stability of a grid-type converter according to claim 1, wherein the VSM control strategy is:
Figure FDA0003861920350000011
in the formula, delta g Is an active angle; h g Is the constant of inertia, D g Is the damping coefficient; p is a radical of g_ref_pu And p g_pu Respectively representing active reference value and outputGiving out a per unit value of the power; omega 0 Is the nominal frequency, Δ ω pu Is the nominal value of the frequency variation.
3. The control method for enhancing the transient stability of the grid converter according to claim 1, wherein the obtaining the active angle between the grid converter and the power grid comprises: and obtaining the phase difference between the voltage of the network-forming type converter and the voltage of the power grid, namely the active angle.
4. The control method for enhancing the transient stability of the grid-type converter according to claim 1, wherein the gain element comprises a proportional element, a proportional-integral element and a proportional-integral-derivative element.
5. The control method for enhancing the transient stability of the grid-type converter according to claim 1, wherein the larger the gain link is, the higher the transient stability of the grid-type converter is.
6. The control method for enhancing the transient stability of the grid type converter according to claim 1, wherein the grid type converter is connected with a power grid through an LCL filter.
7. A control system for enhancing transient stability of a grid-type converter, comprising:
a VSM control module configured to: controlling the phase of the network construction type converter by adopting a VSM control strategy to obtain an active angle between the network construction type converter and a power grid;
an enhanced stabilization module configured to: the difference value between the current active angle and the active angle of the initial balance point is controlled by the gain link to amplify the influence and act on the voltage controller, so that the voltage value output by the network type converter is increased along with the increase of the active angle, and the transient stability of the network type converter is enhanced.
8. The control system for enhancing the transient stability of the grid-type converter according to claim 7, wherein the stability of the control system is evaluated according to the magnitude relationship between the limit cut-off time and the fault cut-off time.
9. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the steps in the control method for enhancing the transient stability of a grid-type converter according to any one of claims 1 to 6.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps in the control method for enhancing the transient stability of a mesh-type converter according to any one of claims 1-6 when executing the program.
CN202211165721.9A 2022-09-23 2022-09-23 Control method and system for enhancing transient stability of network-structured converter Pending CN115566721A (en)

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