CN118137524A - Camera adjustment and SVG self-response cooperative control method based on direct current commutation failure - Google Patents
Camera adjustment and SVG self-response cooperative control method based on direct current commutation failure Download PDFInfo
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Abstract
The invention provides a self-response cooperative control method of a camera and SVG based on direct current commutation failure. Comprising the following steps: setting a self-response action threshold value of the phase regulator and the SVG for coping with direct current commutation failure; providing a self-response control method of the phase-regulating device for coping with direct-current phase-conversion failure; providing a self-response control method of SVG for coping with direct current commutation failure; a self-response cooperative control method for coping with direct current commutation failure by a camera and SVG is provided. The invention aims to restrain the transient low voltage of the power grid at the direct current transmitting end generated by the direct current commutation failure from exceeding the transient low voltage limit value, and the self-response action threshold value of the phase regulator and the SVG for coping with the direct current commutation failure is set in advance, so that the phase regulator and the SVG perform self-response action according to the set threshold value, the problem that the phase regulator and the SVG cannot quickly regulate reactive power output when the direct current commutation failure occurs is solved, the effect of effectively restraining the transient low voltage exceeding the low voltage limit value is achieved, and the consumption of new energy is further promoted.
Description
Technical Field
The invention belongs to the field of transient voltage control of a new energy direct current transmission end power grid, and particularly relates to a self-response cooperative control method of a phase regulator and SVG based on direct current commutation failure.
Background
In recent years, under the strategy of energy development of a double-carbon target, new energy industries such as photovoltaics, wind power and the like in China develop in a crossing mode, and the installed capacity of new energy is continuously increased. Because more than 80% of wind and light resources in China are concentrated in western and northern areas, new energy industries in the areas are rapidly developed. By the end of 2022, the new energy final assembly machines in northwest, north China and eastern regions account for 60.5% of the national new energy final assembly machines. The wind power and light Fu Daji of China rapidly develop, and the method has the characteristics of large unit capacity of a new energy station and concentrated regional distribution.
The extra-high voltage direct current transmission is an energy bridge connecting the resource center and the load center, can optimize resource allocation, and solves the problems of rich energy sources in northwest regions, weak consumption capacity, strong energy source consumption capacity in southeast regions and weak energy sources. The extra-high voltage direct current transmission can be used for long-distance and large-scale transmission of electric power generated by new energy, and becomes a main development mode of cross-region transmission matched with a new energy large-base. With the continuous construction of an extra-High Voltage Direct Current (HVDC) transmission project, a high-proportion new energy power transmission end power grid transmits new energy power through the extra-high voltage direct current, and the new energy consumption capability is promoted. At the same time, however, the problem of transient voltage of the power transmission end alternating current power grid caused by the specific fault of the direct current power transmission system seriously reduces the safety and stability of the power transmission end power grid and the new energy source output level.
The commutation failure is one of common faults of the extra-high voltage direct current transmission system, and the problem of transient low voltage of the transmitting-end alternating current power grid is caused to have a great influence on safe operation of the transmitting-end power grid. The existing dynamic reactive power compensation device has the problems of larger delay and no cooperative coordination in the control of commutation failure, so that the performance of the reactive power compensation device is not fully exerted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a self-response cooperative control method of a phase regulator and SVG based on direct current commutation failure, so that transient low voltage generated by the direct current commutation failure is restrained from being not lower than a power grid transient low voltage limit value, and a reference is provided for safe operation of a power grid at a transmitting end of large-scale new energy access.
The technical scheme of the invention is as follows:
One of the invention provides a self-response cooperative control method of a phase-change machine and SVG based on direct current commutation failure, comprising the following steps: setting a transient low-voltage action threshold value of a phase regulator and SVG for coping with direct current commutation failure; the method comprises the steps of obtaining the alternating current bus voltage of a rectification station when direct current commutation fails, judging the transient low voltage action threshold of the rectification station when the direct current commutation fails and the alternating current bus voltage of the rectification station when the direct current commutation fails through the rectification machine, establishing a rectification machine self-response control model, and providing a rectification machine self-response control method based on the rectification machine self-response control model; acquiring alternating current bus voltage of the 750kV cluster station when the direct current commutation fails, judging the alternating current bus voltage of the 750kV cluster station when the direct current commutation fails by using a transient low voltage action threshold of the SVG for coping with the direct current commutation failure and establishing an SVC self-response control model, and providing an SVC self-response control method based on the SVC self-response control model; and obtaining a self-response cooperative control method of the phase regulator and the SVG for coping with the direct current commutation failure by comparing the alternating current bus voltage of the rectifying station with the bus voltage of the 750kV cluster station and the transient low voltage action threshold value when the direct current commutation fails based on the phase regulator self-response control method and the SVC self-response control method.
The method comprises the following operation steps: providing a self-response control method of the phase-regulating device for coping with direct-current phase-conversion failure; providing a self-response control method of SVG for coping with direct current commutation failure; a self-response cooperative control method for coping with direct current commutation failure by a camera and SVG is provided. The method firstly sets a transient low-voltage action threshold value of the phase regulator and the SVG for coping with direct-current commutation failure, judges the direct-current commutation failure condition according to alternating-current bus voltage of the rectifying station and the 750kV cluster station, establishes a self-response control model of the phase regulator and the SVG, and provides a corresponding self-response control method. The cooperative control of the rectifier station and the 750kV cluster station under the condition of direct current commutation failure is realized by comparing the bus voltage of the rectifier station and the 750kV cluster station and the transient low voltage action threshold value and applying a self-response control method of a rectifier and SVG. The method can enable the phase regulator and the SVG to rapidly respond when the direct current commutation fails by setting a transient low-voltage action threshold and establishing a self-response control model, and protect the stable operation of the alternating current bus voltage. In addition, the cooperative control method can coordinate the phase regulator and the SVG, so that the robustness and the stability of the power system are improved, the potential problems caused by direct current commutation failure are effectively solved, and the safe operation of the power grid is ensured.
The second aspect of the present invention is to provide a self-response cooperative control system for a camera and an SVG based on a dc commutation failure, comprising:
And a data acquisition module: the method comprises the steps of configuring alternating current bus voltage of a rectifier station when direct current commutation fails and alternating current bus voltage of a 750kV cluster station when direct current commutation fails;
the camera self-response control module: the method comprises the steps of setting up a self-response control model of a camera, and providing a self-response control method of the camera;
SVC self-response control module: the SVC self-response control method is configured to establish an SVC self-response control model and put forward an SVC self-response control method;
Self-response cooperative control integration module: the self-response cooperative control method for the direct current commutation failure of the phase regulator and the SVG is provided based on data comparison, a reference phase regulator self-response control method and an SVC self-response control method.
The system comprises a data setting module, a control module and a control module, wherein the data setting module is used for configuring transient low-voltage action thresholds of a regulator and SVG when direct current commutation fails, so that the system can respond in time and take control measures. And then, the self-response control module of the camera is responsible for establishing a self-response control model of the camera and providing a corresponding control method to protect the stable operation of the voltage of the alternating current bus. Meanwhile, the SVC self-response control module is used for establishing an SVC self-response control model and providing an SVC self-response control method so as to solve the voltage problem when the direct current commutation fails. Finally, the self-response cooperative control integration module refers to a self-response control method of a phase regulator and a self-response control method of an SVG based on data comparison, and provides a self-response cooperative control method of the phase regulator and the SVG for coping with direct current commutation failure, so that the phase regulator and the SVG can cooperatively work under the condition of direct current commutation failure, and stable operation of a power system is ensured. The system has the advantages that under the condition of direct current commutation failure, automatic cooperative control of the phase regulator and the SVG can be realized, stable operation of the voltage of the alternating current bus is protected, and the robustness and the stability of the power system are improved. Meanwhile, due to the modularized design of the system, functions of all parts are clear, the system is easy to maintain and manage, and reliability and maintainability of the system are improved. The design of the integration module also enables the system to have stronger adaptability and flexibility, can be adjusted and optimized according to actual conditions, ensures that the system can effectively cope with various emergency situations, and ensures the safe operation of the power system.
The invention also provides a communication connection between the camera based on the direct current commutation failure and the SVG self-response cooperative control device and between the camera based on the direct current commutation failure and the SVG self-response cooperative control system.
A fourth aspect of the present invention provides a computer-readable medium having stored thereon a computer program which, when executed by a processor, performs a method as set forth in one of the objects.
The beneficial effects of the invention are as follows:
1) By setting the transient low-voltage action threshold, the system can quickly respond when the direct current commutation fails, and the stable operation of the alternating current bus voltage is protected, so that the robustness and the stability of the system are improved.
2) By acquiring the alternating current bus voltage of the rectification station in real time and combining the self-response control model of the rectifier, the system can accurately judge the direct current commutation failure condition, and the recognition and response capability of the power grid abnormal condition are improved. The self-response control method of the phase-regulating machine can quickly take control measures, protect the voltage of the alternating current bus to stably run, and ensure the safety of a power grid.
3) The alternating current bus voltage of the 750kV cluster station is obtained in real time, and the SVG self-response control model is combined, so that the system can more accurately identify the direct current commutation failure condition, and the identification and response capability to the abnormal condition of the power grid are improved. The SVC self-response control method can quickly take control measures, protect the stable operation of the voltage of the alternating current bus and ensure the safety of the power grid.
4) By comparing the bus voltage of the rectifying station with the bus voltage of the 750kV cluster station and the transient low-voltage action threshold, the system can judge the direct-current commutation failure condition, and realize self-response cooperative control of the phase-regulating device and the SVG based on a self-response control method of the phase-regulating device and an SVC (static var compensator) self-response control method, so that the robustness and the stability of the power system are improved, the potential problems caused by the direct-current commutation failure are effectively solved, and the safe operation of a power grid is ensured.
According to the invention, the aim of inhibiting the transient low voltage generated by the direct current commutation failure from being not lower than the transient voltage limit value is achieved, the self-response action threshold value of the phase-change camera and the SVG for coping with the direct current commutation failure is set in advance, so that the phase-change camera and the SVG perform self-response action according to the set threshold value, the delay time of the phase-change camera and the SVG is reduced, the problem that reactive power output cannot be cooperatively regulated when the phase-change camera and the SVG are in direct current commutation failure is solved, the effect of effectively inhibiting the transient low voltage generated by the direct current commutation failure and lower than the power grid transient low voltage limit value is achieved, and the consumption of new energy is promoted.
Drawings
FIG. 1 is a flow chart of a self-response cooperative control method of a camera and SVG based on DC commutation failure according to the present invention;
FIG. 2 is a schematic diagram of a wiring according to the present invention;
FIG. 3 is a schematic diagram of the self-response action threshold values of the camera and SVG set in the present invention for DC commutation failure;
FIG. 4 is a schematic diagram of the wiring described in example 2;
FIG. 5 is a graph showing the comparison of AC bus voltages for a rectification station according to example 2;
Fig. 6 is a voltage comparison chart of a key control node bus of the new energy cluster station in example 2.
Detailed Description
The technical scheme of the invention is further described below by specific embodiments with reference to the accompanying drawings:
Example 1
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Fig. 1 is a flowchart of a self-response cooperative control method of a camera and SVG based on a dc commutation failure. In fig. 1, a flowchart of a self-response cooperative control method for a camera and SVG based on a dc commutation failure provided by the present invention includes:
s1: setting a self-response action threshold value of the phase regulator and the SVG for coping with direct current commutation failure;
S2: providing a self-response control method of the phase-regulating device for coping with direct-current phase-conversion failure;
S3: providing a self-response control method of SVG for coping with direct current commutation failure;
S4: a self-response cooperative control method for coping with direct current commutation failure by a camera and SVG is provided.
When the method is applied, the self-response action threshold values of the phase regulator and the SVG for the direct current commutation failure are set, and the threshold values can be set according to the system requirements so as to trigger corresponding self-response control when the direct current commutation failure occurs. The self-response control method for the phase regulator to cope with the direct current commutation failure is characterized in that the phase regulator can automatically take control measures to maintain the stable operation of the power grid by monitoring the direct current commutation failure and comparing the direct current commutation failure with a set threshold value. According to the self-response control method of the SVG for the direct current commutation failure, the SVG can automatically adjust parameters according to the direct current commutation failure condition so as to maintain the voltage and frequency stability of the power grid. According to the self-response cooperative control method for the direct current commutation failure of the phase regulator and the SVG, the direct current commutation failure can be jointly handled by the phase regulator and the SVG through cooperative control, so that stable operation of a power grid is ensured. The self-response cooperative control method of the phase-change camera and SVG based on direct current phase-change failure can improve the robustness of the system, quickly respond to system faults and improve the safety of a power grid, and is an effective power system protection and control method.
The step S1 comprises the following steps:
s101: acquiring a regulator and SVG parameters, and acquiring a transient low-voltage limit U min of a direct current end power grid;
S102: and setting a self-response action threshold value of the regulator and the SVG for the direct current commutation failure.
The low-voltage instability criterion in the national power grid company power system safety and stability calculation rule is 0.75p.u, and based on the low-voltage instability criterion, the transient state excessively low-voltage limit value U min of the converter station and the 750kV cluster station is 0.75p.u;
As shown in the wiring schematic diagram of fig. 2, when the dc system fails to commutate, the phase regulator of the dc-link power grid rectification station should act to regulate reactive power first to prevent the transient low voltage from further developing, and for the SVG of the new energy cluster station, act to regulate reactive power later to further supplement the control of the phase regulator on the transient low voltage. Based on this, considering that the operation response time of the tuner and the SVG is 30ms to 50ms, the transient low voltage operation threshold U sc_min for the tuner to cope with the failure of the dc commutation is set to be 0.85p. The transient low voltage operation threshold U SVG_min for SVG to cope with dc commutation failure is set to 0.8p. The self-response action thresholds of the camera and SVG against dc commutation failure are shown in table 1.
TABLE 1 self-response action threshold for camera and SVG to cope with DC commutation failure
| Threshold type | Bus voltage amplitude (p.u) |
| Transient over-low voltage limit U min | 0.75 |
| Transient low voltage action threshold U of camera sc_min | 0.85 |
| SVG transient low voltage action threshold U SVG_min | 0.8 |
The transient voltage action threshold diagram of the phase regulator and SVG to cope with the phase change failure is shown in fig. 3.
The step S2 comprises the following steps:
S201: establishing a self-response control model of the phase regulator for coping with direct current commutation failure;
(1) Obtaining alternating current bus voltage U sc_t1 of a rectification station when direct current commutation fails;
(2) Calculation of ΔU sc_t and dU sc_t/dt:
ΔUsc_t＝Usc_t1-Usc_min \*MERGEFORMAT(1)
Wherein DeltaU sc_t is the difference value between the alternating current bus voltage U sc_t1 of the rectification station and the transient low voltage action threshold U sc_min of the rectifier when the direct current commutation fails; dU sc_t/dt is the voltage change rate of the alternating current bus of the rectification station when the direct current commutation fails, and U sc_t1+Δt is the voltage value at the delta t moment after the direct current commutation fails.
(3) When U sc_t1＜Usc_min, namely DeltaU sc_t < 0 and dU sc_t/dt < 0, the self-response action of the camera is adjusted, the control model is as follows:
Qsc＝-Usc_t2(G(t)*ΔUsc_t)+ΔUsc_tid0\*MERGEFORMAT(3)
KB＝(X′d+Xtr)/(Xd+Xtr+KAXtr) \*MERGEFORMAT(5)
constraint conditions:
Qsc min≤Qsc≤Qsc max \*MERGEFORMAT(6)
note that: the model of the invention is a per unit value;
wherein: q sc is the reactive power emitted by the dimmer; q scmax is the maximum reactive output limit of the dimmer; q scmin is the maximum absorption reactive limit of the tuner; g (t) is the equivalent conductance of a voltage regulator and a step-up transformer thereof; x tr is the short-circuit reactance of the grid-connected transformer of the camera; x d is the d-axis steady-state reactance of the camera; x' d is the d-axis transient reactance of the tuner; x' d is the tuning sub-transient reactance; i d0 is the d-axis component of the initial value of the camera current; k A is excitation magnification; k B is an excitation offset coefficient; t' d0 is the initial value of the transient short-circuit time constant of the straight axis; ", represents a convolution symbol.
(4) When U sc_t1＜Usc_min, ΔU sc_t < 0, and dU sc_t/dt is greater than or equal to 0, the camera adjustment is terminated.
S202: a self-response control method of a phase regulator for coping with direct current commutation failure is provided.
(1) Obtaining AC bus voltage U of rectifying station when DC commutation fails sc_t1
(2) When the voltage of the sending end alternating current system is reduced due to the commutation failure of the direct current, judging whether the phase regulator is controlled by self-response
When U sc_min≤Usc_t1≤Usc_n1, the camera is not active.
Where U sc_n1 is the rectifier station bus voltage rating.
When U sc_t1＜Usc_min and dU sc_t/dt is less than 0, the camera automatically responds to the action and performs reactive power control according to a control model;
(3) When U sc_t1＜Usc_min and dU sc_t/dt is more than or equal to 0, the camera terminates the self-response action.
The step S3 comprises the following steps:
S301: establishing a self-response control model of SVG for coping with direct current commutation failure;
(1) Acquiring alternating current bus voltage U SVG_t1 of a 750kV cluster station when direct current commutation fails;
(2) Calculation of ΔU SVG_t and dU SVG_t/dt:
ΔUSVG_t＝USVG_t1-USVG_min \*MERGEFORMAT(13)
(3) SVG when U SVG_t1＜USVG_min, ΔU SVG_t <0, and dU SVG_t/dt <0
And (5) self-responding action. The control model is as follows:
x＝XT_SVG+XL \*MERGEFORMAT(16)
constraint conditions:
0≤QSVG≤QSVGmax \*MERGEFORMAT(17)
note that: the model of the invention is a per unit value;
Wherein: u SVG_t2 is SVG output voltage; x T_SVG is the equivalent impedance of the SVG connection transformer; x L is the connection reactance between the SVG inverter circuit and the transformer. Q SVGmax is the maximum reactive output limit of the SVG.
(4) When dU SVG_t/dt is greater than or equal to 0, SVG stops self-response action.
S302: a self-response control method of SVG for coping with direct current commutation failure is provided.
(1) Acquiring bus voltage U of 750kV cluster station when direct current commutation fails SVG_t1
(2) When the transient voltage of the sending-end alternating current power grid is reduced due to commutation failure of direct current, judging whether SVG is controlled by self-response
When U SVG_min≤USVG_t1≤USVG_n1, SVG does not act.
Wherein U SVG_n1 is a rated value of the bus voltage of the 750kV cluster station.
When U SVG_t1＜USVG_min and dU SVG_t/dt is less than 0, SVG self-responds and performs reactive power control according to a control model;
(3) When U SVG_t1＜USVG_min and dU SVG_t/dt is greater than or equal to 0, SVG stops self-response action.
The step S4 comprises the following steps:
s401: a self-response cooperative control method for coping with direct current commutation failure by a camera and SVG is provided.
(1) Acquiring alternating current bus voltage U sc_t1 of a rectification station and bus voltage U SVG_t1 of a 750kV cluster station when direct current commutation fails;
(2) When the voltage of the sending end alternating current power grid is reduced due to the commutation failure of direct current, judging whether the phase regulator and the SVG are subjected to self-response control:
When U sc_min≤Usc_t1≤Usc_n1 is set, the camera is not operated;
when U SVG_min≤USVG_t1≤USVG_n1, SVG does not act.
When U sc_t1＜Usc_min and dU sc_t/dt is less than 0, the camera automatically responds to the action and performs reactive power control according to a control model;
When U SVG_t1＜USVG_min and dU SVG_t/dt is less than 0, SVG self-responds to action and performs reactive power control according to a control model to be used as supplementary control of a camera;
(3) When U SC_t1＜USC_min and dU sc_t/dt is more than or equal to 0, the camera and the SVG stop self-response actions;
Example 2
In this embodiment, qi Shao extra-high voltage direct current end power grid is used as a background, and the wiring schematic diagram is shown in fig. 4. Setting the threshold voltages of the tuner and the SVG is shown in the following table:
TABLE 2 Camera and SVG Voltage threshold
| Threshold type | Bus voltage amplitude (p.u) |
| Transient over-low voltage limit U min | 0.75 |
| Transient low voltage action threshold U of camera sc_min | 0.85 |
| SVG transient low voltage action threshold U SVG_min | 0.8 |
Qi Shao direct current rectifying station and 750kV cluster station access tuner and SVG capacity are shown in table 3.
Table 3 Qishao direct current rectifying station and 750kV trunking station access camera and SVG capacity
Under Qi Shao direct current conveying capacity 7000MW, the control scheme is adopted, and the comparison scheme is that the camera and the SVG do not carry out self-response coordination control. Simulation verifies Qi Shao that the direct current fails to commutate once in 1 second, and the transient voltage minimum voltages of the rectifying station and the 750kV cluster station are shown in table 4.
The transient voltage change curves of the rectifying station and the 750kV cluster station are shown in fig. 4 and 5:
Table 4 rectifying station and SVG added 750kV trunking station voltage
When the power of the Qishao direct current operation is 7000MW, under the action, and the Qi Shao direct current fails to commutate, the transient low voltage peak value of the alternating current bus of the rectifying station is 0.77421p.u, which is not lower than the limit value of 0.75p.u, and the transient low voltage is not increased by 0.14436p.u under the condition of self-response coordination control, so that the aim of controlling the transient low voltage of the new energy direct current transmission end power grid to be higher than the limit value of 0.75pu is fulfilled. Moreover, after the measures are adopted, the transient high voltage generated subsequently can be effectively reduced.
Example 3: camera and SVG self-response cooperative control system based on direct current commutation failure includes:
And a data acquisition module: the method comprises the steps of configuring alternating current bus voltage of a rectifier station when direct current commutation fails and alternating current bus voltage of a 750kV cluster station when direct current commutation fails;
the camera self-response control module: the method comprises the steps of setting up a self-response control model of a camera, and providing a self-response control method of the camera;
SVC self-response control module: the SVC self-response control method is configured to establish an SVC self-response control model and put forward an SVC self-response control method;
Self-response cooperative control integration module: the self-response cooperative control method for the direct current commutation failure of the phase regulator and the SVG is provided based on data comparison, a reference phase regulator self-response control method and an SVC self-response control method.
The system comprises a data setting module, a control module and a control module, wherein the data setting module is used for configuring transient low-voltage action thresholds of a regulator and SVG when direct current commutation fails, so that the system can respond in time and take control measures. And then, the self-response control module of the camera is responsible for establishing a self-response control model of the camera and providing a corresponding control method to protect the stable operation of the voltage of the alternating current bus. Meanwhile, the SVC self-response control module is used for establishing an SVC self-response control model and providing an SVC self-response control method so as to solve the voltage problem when the direct current commutation fails. Finally, the self-response cooperative control integration module refers to a self-response control method of a phase regulator and a self-response control method of an SVG based on data comparison, and provides a self-response cooperative control method of the phase regulator and the SVG for coping with direct current commutation failure, so that the phase regulator and the SVG can cooperatively work under the condition of direct current commutation failure, and stable operation of a power system is ensured. The system has the advantages that under the condition of direct current commutation failure, automatic cooperative control of the phase regulator and the SVG can be realized, stable operation of the voltage of the alternating current bus is protected, and the robustness and the stability of the power system are improved. Meanwhile, due to the modularized design of the system, functions of all parts are clear, the system is easy to maintain and manage, and reliability and maintainability of the system are improved. The design of the integration module also enables the system to have stronger adaptability and flexibility, can be adjusted and optimized according to actual conditions, ensures that the system can effectively cope with various emergency situations, and ensures the safe operation of the power system.
Example 4: and providing communication connection between the phase-change machine based on the direct current commutation failure and the SVG self-response cooperative control device and between the phase-change machine based on the direct current commutation failure and the SVG self-response cooperative control system.
Example 5
A computer readable medium having stored thereon a computer program which when executed by a processor implements the method according to embodiment 1.
The basic principles of the present invention have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present invention are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the invention. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the invention is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present invention are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present invention, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features herein.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (11)
1. The self-response cooperative control method of the phase-change camera and SVG based on direct current phase-change failure is characterized by comprising the following steps:
acquiring the alternating current bus voltage of the rectification station when the direct current commutation fails, judging the transient low voltage action threshold of the rectification station when the direct current commutation fails through the preset rectification machine to cope with the direct current commutation failure, establishing a rectification machine self-response control model, and providing a rectification machine self-response control method based on the rectification machine self-response control model;
Acquiring alternating current bus voltage of a 750kV cluster station when direct current commutation fails, judging the alternating current bus voltage of the 750kV cluster station when the direct current commutation fails by a preset transient low voltage action threshold of SVG for coping with the direct current commutation failure and the alternating current bus voltage of the 750kV cluster station when the direct current commutation fails, establishing an SVC self-response control model, and providing an SVC self-response control method based on the SVC self-response control model;
And comparing the alternating current bus voltage of the rectifier station with the bus voltage of the 750kV cluster station and the transient low voltage action threshold value when the direct current commutation fails, and obtaining a self-response cooperative control method of the rectifier and the SVG for coping with the direct current commutation failure based on the self-response control method of the rectifier and the SVC.
2. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 1, wherein the method comprises the following steps: the transient low-voltage action threshold comprises a transient low-voltage action threshold U sc_min for coping with the direct-current commutation failure by the camera and a transient low-voltage action threshold U SVG_min for coping with the direct-current commutation failure by the SVG;
Before setting transient low-voltage action thresholds of the phase regulator and the SVG for the direct current commutation failure, the phase regulator and SVG parameters and a direct current end power grid transient low-voltage limit U min are required to be obtained.
3. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 1, wherein the method comprises the following steps: the step of establishing the self-response control model of the camera comprises the following steps:
obtaining alternating current bus voltage U sc_t1 of a rectification station when direct current commutation fails;
Calculation of ΔU sc_t and dU sc_t/dt:
ΔUsc_t＝Usc_t1-Usc_min\*MERGEFORMAT(1)
Wherein DeltaU sc_t is the difference value between the alternating current bus voltage U sc_t1 of the rectification station and the transient low voltage action threshold U sc_min of the rectifier when the direct current commutation fails; dU sc_t/dt is the voltage change rate of the alternating current bus of the rectification station when the direct current commutation fails, and U sc_t1+Δt is the voltage value at the delta t moment after the direct current commutation fails;
When U sc_t1＜Usc_min, namely DeltaU sc_t <0 and dU sc_t/dt <0, the self-response action of the camera is adjusted, the control model is as follows:
Qsc＝-Usc_t2(G(t)*ΔUsc_t)+ΔUsc_tid0\*MERGEFORMAT(3)
KB＝(X′d+Xtr)/(Xd+Xtr+KAXtr)\*MERGEFORMAT(5)
constraint conditions:
Qscmin≤Qsc≤Qscmax\*MERGEFORMAT(6)
wherein: q sc is the reactive power emitted by the dimmer; q scmax is the maximum reactive output limit of the dimmer; q scmin is the maximum absorption reactive limit of the tuner; g (t) is the equivalent conductance of a voltage regulator and a step-up transformer thereof; x tr is the short-circuit reactance of the grid-connected transformer of the camera; x d is the d-axis steady-state reactance of the camera; x' d is the d-axis transient reactance of the tuner; x' d is the tuning sub-transient reactance; i d0 is the d-axis component of the initial value of the camera current; k A is excitation magnification; k B is an excitation offset coefficient; t' d0 is the initial value of the transient short-circuit time constant of the straight axis; ", represents a convolution symbol.
4. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 3, wherein the method comprises the following steps: the operation steps of the camera self-response control method based on the camera self-response control model comprise:
obtaining AC bus voltage U of rectifying station when DC commutation fails sc_t1
When the voltage of the sending end alternating current system is reduced due to the commutation failure of the direct current, judging whether the phase regulator is controlled by self-response;
when U sc_min≤Usc_t1≤Usc_n1 is set, the camera is not operated;
Wherein U sc_n1 is the rated value of the bus voltage of the rectifying station;
When U sc_t1＜Usc_min and dU sc_t/dt is less than 0, the self-response action of the camera is carried out, and reactive power control is carried out according to a self-response control model of the camera;
When U sc_t1＜Usc_min and dU sc_t/dt is more than or equal to 0, the camera terminates the self-response action.
5. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 1, wherein the method comprises the following steps: the SVC self-response control model building step comprises the following steps:
Acquiring alternating current bus voltage U SVG_t1 of a 750kV cluster station when direct current commutation fails;
calculation of ΔU SVG_t and dU SVG_t/dt:
ΔUSVG_t＝USVG_t1-USVG_min\*MERGEFORMAT(13)
SVG self-responds when U SVG_t1＜USVG_min, ΔU SVG_t < 0, and dU SVG_t/dt < 0; the control model is as follows:
x＝XT_SVG+XL\*MERGEFORMAT(16)
constraint conditions:
0≤QSVG≤QSVGmax\*MERGEFORMAT(17)
Wherein: u SVG_t2 is SVG output voltage; x T_SVG is the equivalent impedance of the SVG connection transformer; x L is the connection reactance between the SVG inverter circuit and the transformer; q SVGmax is the maximum reactive output limit of SVG;
When dU SVG_t/dt is greater than or equal to 0, SVG stops self-response action.
6. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 5, wherein the method comprises the following steps: the SVC self-response control method based on the SVC self-response control model comprises the following operation steps:
Acquiring a busbar voltage U SVG_t1 of the 750kV cluster station when the direct current commutation fails;
when the transient voltage of the sending-end alternating current power grid is reduced due to the commutation failure of direct current, judging whether SVG self-responds control:
Wherein, when U SVG_min≤USVG_t1≤USVG_n1, SVG does not act;
wherein U SVG_n1 is a rated value of the bus voltage of the 750kV cluster station;
When U SVG_t1＜USVG_min and dU SVG_t/dt is less than 0, SVG self-responds and reactive power control is performed according to an SVC self-response control model;
When U SVG_t1＜USVG_min and dU SVG_t/dt is greater than or equal to 0, SVG stops self-response action.
7. The method for controlling the self-response coordination of a camera and SVG based on direct current commutation failure according to claim 1, wherein the method comprises the following steps: the self-response cooperative control method for the direct current commutation failure of the phase regulator and the SVG comprises the following steps:
Acquiring alternating current bus voltage U sc_t1 of a rectification station and bus voltage U SVG_t1 of a 750kV cluster station when direct current commutation fails;
when the voltage of the sending end alternating current power grid is reduced due to the commutation failure of direct current, judging whether the phase regulator and the SVG are subjected to self-response control:
When U sc_min≤Usc_t1≤Usc_n1 is set, the camera is not operated;
when U SVG_min≤USVG_t1≤USVG_n1 is set, SVG does not act;
When U sc_t1＜Usc_min and dU sc_t/dt is less than 0, the self-response action of the camera is carried out, and reactive power control is carried out according to a self-response control model of the camera;
When U SVG_t1＜USVG_min and dU SVG_t/dt is less than 0, SVG self-responds, and reactive power control is performed according to an SVC self-response control model to be used as supplementary control of a camera;
When U SC_t1＜USC_min and dU sc_t/dt is greater than or equal to 0, the camera and SVG stop the self-response action.
8. The utility model provides a camera and SVG self-response cooperative control system based on direct current commutation failure which characterized in that includes:
And a data acquisition module: the method comprises the steps of configuring alternating current bus voltage of a rectifier station when direct current commutation fails and alternating current bus voltage of a 750kV cluster station when direct current commutation fails;
the camera self-response control module: the method comprises the steps of setting up a self-response control model of a camera, and providing a self-response control method of the camera;
SVC self-response control module: the SVC self-response control method is configured to establish an SVC self-response control model and put forward an SVC self-response control method;
Self-response cooperative control integration module: the self-response cooperative control method for the direct current commutation failure of the phase regulator and the SVG is provided based on data comparison, a reference phase regulator self-response control method and an SVC self-response control method.
9. The self-response cooperative control system of a camera and SVG based on direct current commutation failure of claim 8, wherein the self-response cooperative control system is characterized in that:
The data setting module is required to acquire a camera and SVG parameters and a DC end power grid transient low-voltage limit U min;
the self-response control module of the phase regulator needs to acquire the alternating current bus voltage of the rectifying station when the direct current commutation fails, and judges the transient low-voltage action threshold of the phase regulator when the direct current commutation fails and the alternating current bus voltage of the rectifying station when the direct current commutation fails;
The SVC self-response control module needs to acquire the alternating current bus voltage of the 750kV cluster station when the direct current commutation fails, and judges the transient low-voltage action threshold value of the SVG for the direct current commutation failure and the alternating current bus voltage of the 750kV cluster station when the direct current commutation fails;
And comparing data in the self-response cooperative control integration module: by comparing the alternating current bus voltage of the rectifying station with the bus voltage of the 750kV cluster station and the transient low-voltage action threshold value when the direct current commutation fails.
10. A self-response cooperative control device of a phase-change regulator and SVG based on direct current phase-change failure is characterized in that,
The direct current commutation failure-based camera and SVG self-response cooperative control device is in communication connection with the direct current commutation failure-based camera and SVG self-response cooperative control system according to claim 8 or 9.
11. A computer readable medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any of claims 1-7.
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