CN117791716B - New energy synchronous stabilization and dynamic voltage support security domain modeling method and system - Google Patents
New energy synchronous stabilization and dynamic voltage support security domain modeling method and system Download PDFInfo
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Abstract
The invention discloses a new energy synchronous stabilization and dynamic voltage support security domain modeling method and system, wherein the method comprises the following steps: establishing a coordinate system by taking the equivalent potential phasor of the main network as a reference; and drawing a new energy working point track and a new energy grid-connected control boundary mathematical model under single condition constraint according to the new energy power station synchronous stability constraint and the voltage stability constraint and combining the regulation and control modes of the new energy power station synchronous stability constraint and the voltage stability constraint, and taking the new energy grid-connected control boundary mathematical model as an important theoretical basis for subsequent stable control boundary graphical description. The control scenes under different combined modes are controlled by the network-built new energy according to the preset strong/weak network conditions, the new energy comprehensive regulation and control safety domain with synchronous stability and dynamic voltage supporting capability is calculated in a classified mode, and calculated values of limit conditions such as maximum power points and maximum currents are given. The method provides the safety domain graphical expression of the synchronous stabilization and dynamic voltage support of the comprehensive new energy for the first time, and is an important component for the development of the on-line monitoring software for the stabilization control of the subsequent new energy power station.
Description
Technical Field
The invention belongs to the technical field of new energy grid-connected stable control, and particularly relates to a new energy synchronous stable and dynamic voltage support security domain modeling method and system.
Background
Under different power grid conditions (strong network, weak network and the like) and different new energy control modes (network following type, network constructing type and the like), the active and reactive comprehensive regulation means of the new energy for synchronous stable control and voltage support are different. Most of the existing researches analyze the synchronous stability and the voltage supporting capability of new energy sources from two dimensions of active power control and reactive power control independently, neglect the internal correlation between the regulation and control processes, and little research combines the modulation limit and a line power transmission model to comprehensively analyze the new energy source control, so that the mathematical description of a security domain is not strict enough. On the other hand, as in the conventional synchronous generator stable control, a set of regulation boundary mathematical expression is formed for on-line monitoring.
Disclosure of Invention
The invention aims to provide a new energy synchronous stabilization and dynamic voltage support safety domain modeling method and system, which creatively integrates active and reactive transmission constraints of a circuit and new energy modulation constraints, discusses the safety domain which is cooperatively regulated and controlled by new energy synchronous stabilization and dynamic voltage support under different power grid conditions such as strong grid, weak grid and the like and different new energy control modes such as grid formation and the like, is used for the development of new energy dynamic stabilization control on-line monitoring software, realizes the comprehensive monitoring of new energy grid connection safety stability under a complex environment, and ensures the stable operation of an electric power network.
In a first aspect, the present invention provides a new energy synchronous stabilization and dynamic voltage support safety domain modeling method, including:
by equivalent potential phasors of electric power systems Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
Drawing a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of a power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
Classifying and calculating a new energy grid-connected control security domain in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
In a second aspect, the present invention provides a new energy synchronous stabilization and dynamic voltage support safety domain modeling system, comprising:
A building block configured to phasor with the equivalent potential of the power system Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
The drawing module is configured to draw a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of the power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
The calculation module is configured to calculate new energy grid-connected control security domains in a classified mode in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of weak network conditions and grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
In a third aspect, there is provided an electronic device, comprising: the system comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the new energy synchronous stabilization and dynamic voltage support safety domain modeling method of any of the embodiments of the present invention.
In a fourth aspect, the present invention also provides a computer readable storage medium having stored thereon a computer program, which when executed by a processor, causes the processor to perform the steps of the new energy synchronous stabilization and dynamic voltage support safety domain modeling method of any of the embodiments of the present invention.
According to the new energy synchronous stabilization and dynamic voltage support security domain modeling method and system, mathematical expression of a stability control boundary condition is given out by analyzing the physical relation to be met by new energy control, and the mathematical expression is used as an important theoretical basis for subsequent stability control boundary graphical description; and theoretical support is provided for dynamic stable control on-line monitoring of new energy by deducing limit conditions of new energy regulation under different power grid conditions and different new energy control modes.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments 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 may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a new energy synchronous stabilization and dynamic voltage support safety domain modeling method according to an embodiment of the present invention;
FIG. 2 is a waveform diagram of new energy synchronous instability voltage and current according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a boundary relationship between new energy control under weak grid conditions according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a boundary relationship between new energy control under a strong grid condition according to an embodiment of the present invention;
FIG. 5 is a block diagram of a new energy synchronous stabilization and dynamic voltage support safety domain modeling system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a new energy synchronous stabilization and dynamic voltage support safety domain modeling method of the present application is shown.
As shown in fig. 1, the new energy synchronous stabilization and dynamic voltage support safety domain modeling method specifically includes the following steps:
Step S101, using the equivalent potential phasor of the electric power system Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemCorresponds to the positive direction of the X-axis of the coordinate system.
Synchronous stabilization means in this step that the phase angle difference between the new energy point of common coupling (point of common coupling, PCC) voltage and the grid equivalent potential remains stable. However, when the new energy source is disturbed by the grid or works in weak grid conditions, a serious risk of instability is faced, resulting in a large fluctuation of the transmission power at the PCC as shown in fig. 2. The new energy synchronous stabilization conditions are as follows:
，（1）
In the method, in the process of the invention, For the active power of the system,/>Is the maximum value of active power of the system,/>For the d-axis current to be the same,Is the maximum value of d-axis current;
Reactive voltage support, on the other hand, is an important responsibility that new energy should bear, requiring that the voltage amplitude at the PCC fluctuate within a small neighborhood of the rated voltage. When the voltage is unstable, the system voltage level may deteriorate, even causing a cascading failure.
Both problems are related to the equivalent potential phasor of the power systemGrid-tie point voltage phasors/>Transmission line power transmission level (line reactance is/>)) LCL filter of new energy power generation unit (filtering reactance is/>)) New energy equivalent internal potential phasor/>And (5) correlation. The application performs graphical modeling by means of the phase diagram (figure 3), and provides a modeling foundation for subsequent stable control visualization.
According to the physical relationship, grid-connected point voltage phasorsThe method meets the following conditions:
，（2）
Wherein, ，
，
In the method, in the process of the invention,For q-axis current,/>Is imaginary axis sign,/>To compensate the voltage phasors of the grid connection points before.
Step S102, drawing a new energy regulation boundary in the coordinate system according to a preset constraint condition to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint condition comprises an equivalent potential phasor of a power systemTrack constraint, system working point motion track constraint and new energy equivalent internal potential/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (c).
In this step, the equivalent potential phasors of the power systemThe trajectory constraints are:
If the coordinate system origin O is set as:
，（3）
Equivalent potential phasors for power systems Coordinates of the tail point a point of (c) are:
，（4）
Wherein, The equivalent potential of the power system is given;
The motion trail constraint of the system working point is as follows:
Defining voltage phasors of grid-connected points before compensation The tail point D point of the system is the working point of the system, and then the tail point D pointIs one of/>Is the center of a circle,/>Circle of radius:
，（5）
in fig. 3 the innermost circle.
New energy equivalent internal potential phasorThe limit circle constraint of (2) is: new energy equivalent internal potential phasor/>Is one of/>As the center of a circle, the equivalent internal potential of new energy/>Circle of radius:
，（6）
Wherein, Is the abscissa of C point,/>Is the ordinate of the point C;
by system DC voltage/> And modulation ratio/>Decision, calculation/>The expression of (2) is:
，（7）
When (when) Take maximum/>，/>Take its maximum value/>New energy equivalent internal potential phasor/>The expression of the limit circle constraint of (2) is:
，（8）
in fig. 3 the outermost circle corresponds.
Grid-connected point voltage phasorThe limit circle constraint of (2) is: in FIG. 3, grid tie voltage phasors/>The tail point of (2) is point BThe motion track of the point B is one of the points/>Is the center of a circle,/>Circle of radius:
，（9）
Wherein, ，（10）
In the method, in the process of the invention,For the equivalent potential of the power system,/>Is equivalent internal potential of new energy source,/>Is the line impedance ratio,/>For filtering reactance,/>Is the line reactance.
Obviously, the motion track of the point B represents the limit of reactive voltage and active phase adjustment of the system and is an important boundary forming a security domain.
The formula (3), the formula (4), the formula (5), the formula (8) and the formula (9) form a new energy regulation boundary.
Step S103, classifying and calculating a new energy grid-connected control security domain in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
In this step, according to the geometrical relationship, when:
，（11）
The grid-connected voltage regulation limit rings are all positioned outside the system working point circle (as shown in figure 3), and no intersection point exists. Under this condition, the system is in a weak grid state. In contrast, grid-tied voltage regulation limit loops intersect at the system operating point circle, outside it at the initial stage, and inside it at the later stage of regulation (as shown in fig. 4). The method has important influence on the new energy grid-connected stable and safe domain. The security domain of the new energy grid-connected system is classified and described according to different power grid conditions and different new energy control modes (follow-grid type, grid-formation type and the like).
According to the new energy grid-connected control boundary mathematical model, classifying and calculating a new energy grid-connected control security domain in a first control scene consisting of a weak network condition and a following network type constant power, wherein the new energy grid-connected control security domain specifically comprises the following steps:
In the first control scene, because the grid-connected voltage regulation limit rings are all positioned outside the system working point circle, the voltage and the power of the grid-connected point can be regulated and controlled in a full range, and when the grid-following constant power control is adopted, the system working point follows an arc line Sliding to the O point until the O point;
When moving to an arc When the middle point is reached, the active power reaches the maximum value, and is:
，（12）
In the method, in the process of the invention, Is the maximum value of active power of the system,/>For line reactance,/>The equivalent potential of the power system is given;
When moving to an arc When the tail O point is reached, the active current reaches the maximum value, and is as follows:
，（13）
In the method, in the process of the invention, Is the maximum value of the d-axis current.
According to the new energy grid-connected control boundary mathematical model, classifying and calculating a new energy grid-connected control security domain in a second control scene formed by a weak network condition and a follow-up network type sagging control or a weak network condition and a network type virtual synchronous machine, wherein the new energy grid-connected control security domain specifically comprises the following steps:
In the second control scenario, the voltage of the grid-connected point can be regulated and controlled according to the control reference, and the control reference value is assumed to be Grid-tie-point voltage/>. With O point as the center,/>Draw an arc for radius/>Arc/>Respectively intersect straight line OA and arcAt points V and U; obviously, point U will be the arc/>Is divided into two parts, in the first half part, arc/>At arc/>Inside, the voltage can be regulated and controlled to/>; In the latter half, arc/>At arc/>Outside, the voltage is not regulated and controlled to/>。
Depending on the physical relationship of the components,，（14）
Wherein,，（15）
In the method, in the process of the invention,For U-point phase angle,/>Is the line impedance ratio,/>For the equivalent potential of the power system,/>The equivalent internal potential of the new energy source;
The expression of the power maximum is:
，（16）
In the method, in the process of the invention, Is the maximum value of active power of the system,/>Is the line reactance.
According to the new energy grid-connected control boundary mathematical model, classifying and calculating a new energy grid-connected control security domain in a third control scene consisting of strong network conditions and grid-following constant power, wherein the new energy grid-connected control security domain specifically comprises:
under a third control scene, the grid-connected voltage regulation limit ring and the system working point circle are intersected at a K point, and according to a physical relationship, the calculation formula of the K point coordinate is as follows:
，（17）
In the method, in the process of the invention, Is the line impedance ratio,/>For the equivalent potential of the power system,/>The equivalent internal potential of the new energy source;
Wherein, ，（18）
In the method, in the process of the invention,The phase angle is K point phase angle;
obviously, the K point will be the arc Is divided into two parts. In the first half,/>At arc/>Inside, the voltage can be regulated and controlled to/>; In the latter half,/>At arc/>Outside, the system regulation can trigger modulation protection, and is not controllable. Thus, in this scenario, the regulatable region is/>And/>，（19）
The expression for calculating the power maximum is:
，（20）
In the method, in the process of the invention, Is the maximum value of active power of the system,/>Is the line reactance;
grid-connected point voltage phasor before compensation When the tail point D of the voltage transformer is moved to the point K, the active current reaches the maximum value, and the voltage transformer is as follows:
，（21）
In the method, in the process of the invention, Is the maximum value of the d-axis current.
Classifying and calculating a new energy grid-connected control security domain in a fourth control scene formed by strong network conditions and grid-following sagging control or weak network conditions and a grid-constructing virtual synchronous machine according to a new energy grid-connected control boundary mathematical model, wherein the fourth control scene is similar to the second control scene,
The expression for calculating the power maximum is:
，（22）
in summary, the method of the application gives out mathematical expression of the stable control boundary condition by analyzing the physical relation to be satisfied by the new energy control, and is used as an important theoretical basis for the subsequent graphic description of the stable control boundary; and theoretical support is provided for dynamic stable control on-line monitoring of new energy by deducing limit conditions of new energy regulation under different power grid conditions and different new energy control modes.
In one embodiment, the method specifically comprises the following steps:
and (1) determining the origin and the positive direction of the coordinate system. To be used for Establishing a coordinate system for the reference, wherein/>The origin of (a) is defined as the origin O,/>, of the coordinate systemThe positive direction corresponds to the positive direction of the X-axis of the coordinate system.
Step (2), drawing new energy regulation boundaries according to formulas (3), (4), (5), (8) and (9), wherein the new energy regulation boundaries comprise equivalent potential phasors of the power systemTrack constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Limit circle constraints of (c), etc.
And (3) classifying and calculating a new energy grid-connected control security domain according to the weak grid condition, the grid-following constant power control scene, the weak grid condition, the grid-following droop control or the weak grid condition, the grid-constituting virtual synchronous machine control scene, the strong grid condition, the grid-following constant power control scene, the strong grid condition, the grid-following droop control or the weak grid condition, and the grid-constituting virtual synchronous machine control scene.
Weak network condition + following network constant power control scenario: the universe is controllable.
And respectively calculating the maximum active power and the maximum active current according to a formula (12) and a formula (13).
Weak network condition + following network type droop control or weak network condition + network type virtual synchronous machine control scene: the universe is controllable.
And respectively calculating the maximum active power and the maximum active current according to the formula (16) and the formula (13).
Strong network condition + following network constant power control scenario: and the local area is controllable.
And respectively calculating the maximum active power and the maximum active current according to a formula (20) and a formula (21).
Strong network condition + following network type drooping control or weak network condition + network type virtual synchronous machine control scene: and the local area is controllable.
And respectively calculating the maximum active power and the maximum active current according to a formula (22) and a formula (21).
Referring to fig. 5, a block diagram of a new energy synchronous stabilization and dynamic voltage support safety domain modeling system according to the present application is shown.
As shown in fig. 5, the new energy synchronous stabilization and dynamic voltage support safety domain modeling system 200 includes a construction module 210, a drawing module 220, and a calculation module 230.
Wherein the construction module 210 is configured to phasor with the equivalent potential of the power systemEstablishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
The drawing module 220 is configured to draw a new energy regulation boundary in the coordinate system according to a preset constraint condition to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint condition comprises an equivalent potential phasor of the electric power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
the calculation module 230 is configured to calculate a new energy grid-connected control security domain in a classification manner in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a following network type constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
It should be understood that the modules depicted in fig. 5 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 5, and are not described here again.
In other embodiments, embodiments of the present invention further provide a computer readable storage medium having stored thereon a computer program, where the program instructions, when executed by a processor, cause the processor to perform the new energy synchronous stabilization and dynamic voltage support safety domain modeling method in any of the method embodiments described above;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
by equivalent potential phasors of electric power systems Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
Drawing a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of a power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
Classifying and calculating a new energy grid-connected control security domain in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created from the use of new energy synchronous stabilization and dynamic voltage support safety domain modeling systems, and the like. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located with respect to the processor, which may be connected to the new energy synchronous stabilization and dynamic voltage support safety domain modeling system through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, as shown in fig. 6, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 6. Memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running non-volatile software programs, instructions and modules stored in the memory 320, i.e. implementing the method for modeling a new energy synchronization stabilization and dynamic voltage support safety domain of the above-described method embodiment. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the new energy synchronous stabilization and dynamic voltage support safety domain modeling system. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
As an embodiment, the electronic device is applied to a new energy synchronous stabilization and dynamic voltage support safety domain modeling system, and is used for a client, and includes: 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, the instructions being executable by the at least one processor to enable the at least one processor to:
by equivalent potential phasors of electric power systems Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
Drawing a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of a power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
Classifying and calculating a new energy grid-connected control security domain in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The new energy synchronous stabilization and dynamic voltage support safety domain modeling method is characterized by comprising the following steps of:
by equivalent potential phasors of electric power systems Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
Drawing a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of a power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasors/>Is limited by the limit circle constraint of (2);
Classifying and calculating a new energy grid-connected control security domain in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of a weak network condition and a grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
2. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the electric power system equivalent potential phasorsThe trajectory constraints are:
if the origin O of the coordinate system is set to Then the equivalent potential phasor of the power system/>The coordinates of the tail point A point of (2) are/>Wherein/>The equivalent potential of the power system is given;
the motion trail constraint of the system working point is as follows:
Defining voltage phasors of grid-connected points before compensation The tail point D point of the system is the working point of the system, and the tail point D point/>Is one of/>Is the center of a circle,/>Circle of radius/>。
3. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the new energy equivalent internal potential phasorThe limit circle constraint of (2) is:
New energy equivalent internal potential phasor Is one of/>As the center of a circle, the equivalent internal potential of new energy/>Circle of radius/>Wherein/>Is the abscissa of C point,/>Is the ordinate of C point,/>From system DC voltageAnd modulation ratio/>Decision, calculation/>The expression of (2) is:
；
When (when) Take maximum/>，/>Take its maximum value/>New energy equivalent internal potential phasorThe expression of the limit circle constraint of (2) is:
。
4. the method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the grid-connected point voltage phasors The limit circle constraint of (2) is:
Definition of a grid-connected point voltage phasor The tail point of (2) is B point/>The motion track of the point B is one of the points/>Is the center of a circle,/>Circle of radius/>Wherein/>，For the equivalent potential of the power system,/>Is equivalent internal potential of new energy source,/>Is the line impedance ratio,/>For filtering reactance,/>Is the line reactance.
5. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the classifying and calculating the new energy grid-connected control safety domain in a preset control scene according to the new energy grid-connected control boundary mathematical model comprises:
classifying and calculating a new energy grid-connected control security domain in a first control scene consisting of a weak network condition and a grid-following constant power according to the new energy grid-connected control boundary mathematical model, wherein the new energy grid-connected control security domain comprises the following specific steps:
In the first control scene, because the grid-connected voltage regulation limit rings are all positioned outside the system working point circle, the voltage and the power of the grid-connected point can be regulated and controlled in a full range, and when the grid-following constant power control is adopted, the system working point follows an arc line Sliding to the O point until the O point;
When moving to an arc When the middle point is reached, the active power reaches the maximum value, and is:
，
In the method, in the process of the invention, Is the maximum value of active power of the system,/>For line reactance,/>The equivalent potential of the power system is given;
When moving to an arc When the tail O point is reached, the active current reaches the maximum value, and is as follows:
，
In the method, in the process of the invention, Is the maximum value of the d-axis current.
6. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the classifying and calculating the new energy grid-connected control safety domain in a preset control scene according to the new energy grid-connected control boundary mathematical model comprises:
According to the new energy grid-connected control boundary mathematical model, classifying and calculating a new energy grid-connected control security domain in a second control scene formed by a weak network condition and a follow-up network type sagging control or a weak network condition and a network type virtual synchronous machine, wherein the new energy grid-connected control security domain specifically comprises the following steps:
In the second control scenario, the grid-connected point voltage may be regulated according to a control reference value, where the control reference value is assumed to be Grid-tie-point voltage/>; Wherein/>，/>For U-point phase angle,/>Is the line impedance ratio,/>For the equivalent potential of the power system,/>The equivalent internal potential of the new energy source;
The expression for calculating the power maximum is:
，
In the method, in the process of the invention, Is the maximum value of active power of the system,/>Is the line reactance.
7. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 1, wherein the classifying and calculating the new energy grid-connected control safety domain in a preset control scene according to the new energy grid-connected control boundary mathematical model comprises:
Classifying and calculating a new energy grid-connected control security domain in a third control scene consisting of strong network conditions and grid-following constant power according to the new energy grid-connected control boundary mathematical model, wherein the new energy grid-connected control security domain comprises the following specific steps:
under the third control scene, the grid-connected voltage regulation limit ring and the system working point circle are intersected at a K point, and according to a physical relationship, the calculation formula of the K point coordinate is as follows:
，
In the method, in the process of the invention, Is the line impedance ratio,/>For the equivalent potential of the power system,/>The equivalent internal potential of the new energy source;
Wherein, ，/>The phase angle is K point phase angle;
The expression for calculating the power maximum is:
，
In the method, in the process of the invention, Is the maximum value of active power of the system,/>Is the line reactance;
grid-connected point voltage phasor before compensation When the tail point D of the voltage transformer is moved to the point K, the active current reaches the maximum value, and the voltage transformer is as follows:
，
In the method, in the process of the invention, Is the maximum value of the d-axis current.
8. The method for modeling a new energy synchronous stabilization and dynamic voltage support safety domain according to claim 6, wherein the classifying and calculating the new energy grid-connected control safety domain in a preset control scene according to the new energy grid-connected control boundary mathematical model comprises:
Classifying and calculating a new energy grid-connected control security domain in a fourth control scene formed by strong network conditions and grid-following droop control or weak network conditions and a grid-constructing virtual synchronous machine according to the new energy grid-connected control boundary mathematical model, wherein the expression for calculating the maximum power is as follows:
，
In the method, in the process of the invention, Is the K-point phase angle, and/>；
Wherein,。
9. A new energy synchronous stabilization and dynamic voltage support safety domain modeling system, comprising:
A building block configured to phasor with the equivalent potential of the power system Establishing a coordinate system for the reference, wherein the equivalent potential phasors/>, of the power systemThe origin of (2) is defined as the origin O of the coordinate system, and the equivalent potential phasor/>, of the electric power systemThe positive direction of the X axis of the corresponding coordinate system;
The drawing module is configured to draw a new energy regulation boundary in the coordinate system according to preset constraint conditions to obtain a new energy grid-connected control boundary mathematical model, wherein the constraint conditions comprise equivalent potential phasors of the power system Track constraint, system working point motion track constraint and new energy equivalent internal potential phasor/>Limit circle constraint of (2) and grid-connected point voltage phasorsIs limited by the limit circle constraint of (2);
The calculation module is configured to calculate new energy grid-connected control security domains in a classified mode in a preset control scene according to the new energy grid-connected control boundary mathematical model, wherein the control scene comprises a first control scene composed of weak network conditions and grid-following constant power; the second control scene consists of a weak network condition and a following network type sagging control or a weak network condition and a network type virtual synchronous machine; a third control scene consisting of strong network conditions and constant power of the following network; and a fourth control scene consisting of strong network conditions and following network type sagging control or weak network conditions and a network type virtual synchronous machine.
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