CN115173486B - Power grid power distribution method, device, equipment and storage medium - Google Patents
Power grid power distribution method, device, equipment and storage medium Download PDFInfo
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- CN115173486B CN115173486B CN202210887074.6A CN202210887074A CN115173486B CN 115173486 B CN115173486 B CN 115173486B CN 202210887074 A CN202210887074 A CN 202210887074A CN 115173486 B CN115173486 B CN 115173486B
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- 230000000903 blocking effect Effects 0.000 description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The application discloses a power distribution method, a device, equipment and a storage medium of a power grid, wherein when the back-to-back direct current power of a direct current channel is a first preset threshold value, the first power of an alternating current channel is determined, and when the back-to-back direct current power of the direct current channel is a rated value, the second power of the alternating current channel is determined; obtaining target power by using back-to-back direct current rated power and second power, and then determining initial direct current power of a direct current channel; judging whether the alternating current channel is subjected to transient low-voltage instability or not under the condition of the initial direct current power by utilizing a stability judging standard, if not, taking the initial direct current power as back-to-back direct current power of the direct current channel, and determining third power of the alternating current channel; and judging whether the alternating current channel is unstable or not when the alternating current channel fails, if not, determining that the back-to-back direct current power of the power grid is the initial direct current power, and determining that the power of the alternating current channel is the third power, thereby completing reasonable distribution of the power.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a power grid power distribution method, a device, equipment and a storage medium.
Background
With the continuous expansion of a power system, the three problems of insufficient large-area power failure risk prevention and control capability, prominent alternating current-direct current interaction influence and prominent short-circuit current exceeding standard of a power grid are increasingly highlighted. In order to solve the problems encountered in the development of the power grid, a new 500kV large bay area outer ring is provided in the industry, things inside the bead triangles are interconnected back to back by using direct current, and meanwhile, a target grid frame construction scheme of dynamic reactive power compensation equipment is configured in a direct current falling point near area, so that the power grid can operate under a heavy load.
However, in the large-load operation mode, the exchange power of the alternating current and direct current sections is larger, and if reasonable power distribution is not carried out on the direct current channels and the alternating current channels in the power grid, transient voltage instability of the alternating current channels can be caused, so that the stability of the power grid is not facilitated.
Disclosure of Invention
In view of the above, the present application provides a power distribution method, apparatus, device and storage medium for a power grid, which are used for solving the problems that under a large load operation mode of the power grid, ac/dc section exchange power is larger, if reasonable power distribution is not performed on a dc channel and an ac channel in the power grid, transient voltage instability of the ac channel will be caused, and the power grid stability is not facilitated.
In order to achieve the above object, the following schemes are proposed:
In a first aspect, a power grid power distribution method includes:
When back-to-back direct current power of a direct current channel is a first preset threshold value, determining power of an alternating current channel corresponding to the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
If the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power;
determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power;
judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset first stability judging standard;
If not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power;
Judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails according to a preset second stability judging standard;
If not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power.
Preferably, the method further comprises:
And if the product of the back-to-back direct current rated power and the second power is smaller than zero, reducing the back-to-back direct current rated power, taking the reduced back-to-back direct current rated power as a new back-to-back direct current rated power, and returning to execute the step of determining the power of the alternating current channel corresponding to the back-to-back direct current rated power and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as the second power when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power.
Preferably, the determining the initial dc power of the dc channel according to the first power of the ac channel and the target power includes:
taking the first power of the alternating current channel and the larger value of the target power as initial section power;
and taking the back-to-back direct current power corresponding to the initial section power as the initial direct current power.
Preferably, the method further comprises:
if the back-to-back direct current power is the initial direct current power and the direct current channel fails, the initial direct current power is reduced, the reduced initial direct current power is used as new initial direct current power, and the step of judging whether the alternating current channel fails or not by utilizing a preset first stability judging standard is performed.
Preferably, the method further comprises:
If the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power, and when the alternating current channel fails, the alternating current channel is subjected to transient low voltage instability, the initial direct current power is reduced, the reduced initial direct current power is used as new initial direct current power, and the step of judging whether the alternating current channel is subjected to transient low voltage instability or not by using a preset second stability judging standard is performed.
Preferably, the preset first stability criterion is:
And when the back-to-back direct current power is the initial direct current power and the direct current channel fails, the alternating current bus voltage of the power grid is kept below a second preset threshold value within a preset time period, and the alternating current channel is judged to have no transient low-voltage instability.
In a second aspect, a power distribution device for an electrical grid, includes:
the first power determining module is used for determining the power of the alternating current channel corresponding to a first preset threshold value when the back-to-back direct current power of the direct current channel is the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
The second power determining module is used for determining the power of the alternating current channel corresponding to the back-to-back direct current rated power when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
The target power obtaining module is used for adding the back-to-back direct current rated power and the second power to obtain target power if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero;
The initial direct current power determining module is used for determining the initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power;
The first fault judging module is used for judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel is in fault by utilizing a preset first stability judging standard;
The third power determining module is used for determining the power of an alternating current channel corresponding to the initial direct current power as third power when the back-to-back direct current power is judged to be the initial direct current power by utilizing a preset first stability judging standard and the direct current channel fails and the initial direct current power is judged to be the back-to-back direct current power of the direct current channel when the alternating current channel is judged to not have transient low voltage instability;
The second fault judging module is used for judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel is in fault by utilizing a preset second stability judging standard;
And the power distribution module of the power grid is used for determining that the back-to-back direct current power of the direct current channel of the power grid is the initial direct current power and the power of the alternating current channel is the third power when the back-to-back direct current power is the initial direct current power and the power of the alternating current channel is the third power by utilizing a preset second stability judging standard and judging that the alternating current channel is not subjected to transient low-voltage instability.
Preferably, the initial dc power determining module includes:
The first initial direct current power determination submodule is used for taking the first power of the alternating current channel and the larger value of the target power as initial section power;
And the second initial direct current power determining sub-module is used for taking the back-to-back direct current power corresponding to the initial section power as the initial direct current power.
In a third aspect, a grid power distribution apparatus includes a memory and a processor;
The memory is used for storing programs;
the processor is configured to execute the program to implement the steps of the power grid power distribution method according to the first aspect.
In a fourth aspect, a storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the grid power distribution method according to the first aspect.
As can be seen from the above technical solution, in the present application, when the back-to-back dc power of the dc channels is a first preset threshold, determining the power of the ac channel corresponding to the first preset threshold, and taking the power of the ac channel corresponding to the first preset threshold as the first power; when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power; if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power; determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power; judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset stability judging standard; if not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power; judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails by utilizing the stability judging standard; if not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power. According to the scheme, the power of the alternating current channel is determined under different back-to-back direct current powers, so that the initial direct current power of the power grid direct current channel is determined, then the initial direct current power is utilized to respectively determine whether the alternating current channel is unstable in transient voltage when the power grid back-to-back direct current channel is in fault and the power grid alternating current channel is in fault, if the alternating current channel is not unstable, the initial direct current power and the power of the alternating current channel corresponding to the initial direct current power are determined to be respectively used as the power of the direct current channel and the power of the alternating current channel, and therefore reasonable distribution of the power is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is an optional flowchart of a power grid power distribution method according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a power distribution device of a power grid according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a power distribution device for a power grid according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
With the continuous increase of the system scale, the three problems of insufficient large-area power failure risk prevention and control capability, prominent alternating current and direct current interaction influence and prominent short-circuit current exceeding standard of the power grid are increasingly highlighted. In order to solve the problems encountered in the development of the power grid, the related departments propose to newly build an outer ring of a 500kV large bay area, the things inside the bead triangles are interconnected back to back by using direct current, and meanwhile, a target grid construction scheme of dynamic reactive power compensation equipment is configured in a direct current falling point near area, so that the power grid in the south part of China forms an alternating current/direct current parallel power grid with the direct current back to back interconnection. However, in the large-load operation mode, the exchange power of the alternating current and direct current sections is larger, if back-to-back direct current power transmission is arranged more, load central power flow in the near region of the inversion station is larger, and the line is overloaded; if back-to-back direct current power transmission is arranged to be less, the power transmission of the alternating current channel is increased, when the back-to-back direct current has a blocking fault, the power is transferred to the alternating current channel, so that the transient voltage of the alternating current channel is unstable, and if the direct current channel and the alternating current channel in the power grid are not reasonably distributed, the transient voltage of the alternating current channel is unstable, and the stability of the power grid is not facilitated. Therefore, reasonable AC/DC power distribution is carried out on the DC and AC channels of the power grid, and the system stability level of the power grid can be improved.
The embodiment of the invention provides a power distribution method of a power grid, which can be applied to various power grid systems, in particular to a direct-current back-to-back interconnected alternating-current and direct-current parallel power grid, and can also be applied to various computer terminals or intelligent terminals, wherein an execution main body of the method can be a processor or a server of the computer terminals or the intelligent terminals, and a flow chart of the method is shown in fig. 1, and specifically comprises the following steps:
s1: when the back-to-back direct current power of the direct current channels is a first preset threshold value, determining the power of the alternating current channels corresponding to the first preset threshold value, and taking the power of the alternating current channels corresponding to the first preset threshold value as the first power.
Before the method of the application starts, a first preset threshold value can be preset, and when the back-to-back direct current power of the direct current channel is the first preset threshold value, the power of the alternating current channel corresponding to the first preset threshold value is determined.
Alternatively, the power of the ac channel may be calculated according to a first preset threshold power flow, where the power flow calculation refers to calculating the distribution of active power, reactive power and voltage in the power grid under given power system network topology, component parameters, power generation and load parameters. The tide calculation is to determine the steady state operation state parameters of each part of the power system according to the given power grid structure, parameters, the operation conditions of the generator, the load and other elements. In addition, the first preset threshold may be set to zero, i.e. this step may specifically comprise the following procedure:
when the back-to-back direct current power of the direct current channel is 0, the power flow calculates the power of the alternating current channel corresponding to the back-to-back direct current power with the value of 0, and the power of the alternating current channel is taken as the first power of the alternating current channel.
S2: and when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of the alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as the second power.
Based on step S1, the specific procedure of step S2 may include:
When the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, the power flow of the alternating current channel corresponding to the back-to-back direct current rated power is calculated, and the power of the alternating current channel corresponding to the back-to-back direct current rated power is taken as the second power.
S3: and if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain the target power.
Because in the power grid, if the back-to-back direct current power of the direct current channel is too large, the original alternating current channel is changed into the power in the opposite direction, the back-to-back direct current power is understood to be positive, and the power of the alternating current channel is negative, so that the back-to-back direct current rated power is multiplied by the second power, the positive and negative values of the back-to-back direct current power and the power of the alternating current channel can be estimated, at this time, the back-to-back direct current rated power is considered to be positive, if the multiplied product is larger than zero, the power of the alternating current channel is also positive, and the back-to-back direct current rated power and the second power are added to obtain a target power. If the product is 0, the power of the alternating current channel is 0, and the back-to-back direct current rated power and the second power are still added to obtain the target power.
S4: and determining the initial direct current power of the direct current channel according to the first power and the target power of the alternating current channel.
In one example, a screening condition may be preset, one of the first power and the target power of the ac channel is determined, and then the initial dc power of the dc channel is determined therefrom.
S5: and judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset first stability judging standard.
S6: if not, the initial direct current power is used as the back-to-back direct current power of the direct current channels, the power of the alternating current channels corresponding to the initial direct current power is determined, and the power of the alternating current channels corresponding to the initial direct current power is used as the third power.
Step S5 and step S6 are described in combination as follows:
When the back-to-back direct current power is the initial direct current power, the direct current channel is made to fail, and whether the alternating current channel of the power grid is subjected to transient low-voltage instability is judged by using a preset stability judging standard. In one embodiment provided by the application, the faults occurring in the direct current channel may include a blocking fault, wherein the blocking fault may include a direct current monopolar blocking fault and a direct current bipolar blocking fault. Further, the process may include:
1) And judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel is subjected to direct current monopole locking fault by using a preset first stability judging standard.
2) And judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel is subjected to direct current bipolar locking fault by using a preset first stability judging standard.
3) And judging whether the alternating current channel is subjected to transient low-voltage instability or not by utilizing a preset first stability judging standard when the back-to-back direct current power is the initial direct current power and the direct current single-pole locking fault and the direct current double-pole locking fault occur simultaneously.
Under the three conditions, if the ac channel is not subjected to transient low-voltage instability, it can be determined that the ac channel is not subjected to transient low-voltage instability when the back-to-back dc power is the initial dc power and the dc channel fails.
And under the three fault conditions, if transient low-voltage instability does not occur in the alternating current channel, taking the determined initial direct current power as back-to-back direct current power of the direct current channel, determining the power of the alternating current channel corresponding to the initial direct current power, and taking the obtained power of the alternating current channel as third power of the alternating current channel.
S7: and judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails by using a preset second stability judging standard.
S8: if not, determining the back-to-back direct current power of the direct current channels of the power grid as the initial direct current power, and determining the power of the alternating current channels as the third power.
Specifically, when the back-to-back direct current power is the initial direct current power and the power of the alternating current channel is the third power, after a single element fault or a combined element fault occurs at the receiving end of the alternating current channel, transient simulation program calculation can be adopted to comprehensively judge the stability of the transient low voltage of the alternating current channel. Wherein the single element fault includes a line three-phase short-circuit skip return line, a line single-phase short-circuit skip fault phase, and a set of transformer fault trips. The combined element faults comprise a line three-phase short-circuit jump double-circuit line, a single-phase short-circuit switch refusal jump same-string single-phase and a three-phase short-circuit single-phase switch refusal jump same-string three-phase. If transient low-voltage instability does not occur in the ac channel under the above conditions, the back-to-back dc power of the dc channel of the power grid can be determined as the initial dc power, and the power of the ac channel is the power distribution scheme of the third power as the power grid.
The method provided by the embodiment of the invention can further comprise the following steps:
And if the product of the back-to-back direct current rated power and the second power is smaller than zero, reducing the back-to-back direct current rated power, taking the reduced back-to-back direct current rated power as new back-to-back direct current rated power, and returning to the step of determining the power of the alternating current channel corresponding to the back-to-back direct current rated power and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as the second power when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power.
Specifically, if the product of the back-to-back direct current rated power and the second power is smaller than zero, the second power of the alternating current channel is negative, that is, the value of the back-to-back direct current rated power is larger is that the back-to-back direct current rated power is reduced, then the power of the alternating current channel corresponding to the reduced back-to-back direct current rated power is recalculated, whether the product is larger than or equal to zero is judged, if the value of the back-to-back direct current rated power is reduced until the power of the alternating current channel is 0, the back-to-back direct current rated power is not reduced, and the back-to-back direct current rated power corresponding to the alternating current channel when the power of the alternating current channel is 0 is regarded as the changed back-to-back direct current rated power.
Optionally, in step S4, the process of determining the initial dc power of the dc channel according to the first power and the target power of the ac channel may include:
Taking the first power of the alternating current channel and the larger value of the target power as initial section power; and taking the back-to-back direct current power corresponding to the initial section power as the initial direct current power.
Further, after judging whether the alternating current channel is in transient low voltage instability when the back-to-back direct current power is the initial direct current power and the direct current channel fails according to the preset first stability judging standard, if the alternating current channel is in transient low voltage instability when the back-to-back direct current power is the initial direct current power and the direct current channel fails, reducing the initial direct current power, taking the reduced initial direct current power as new initial direct current power, and returning to execute the step of judging whether the alternating current channel is in transient low voltage instability when the back-to-back direct current power is the initial direct current power and the direct current channel fails according to the preset first stability judging standard.
Further, after the second stability criterion is used to determine whether the back-to-back dc power is the initial dc power, the power of the ac channel is the third power, and the ac channel fails, if the back-to-back dc power is the initial dc power, the power of the ac channel is the third power, and the ac channel fails, the ac channel is subjected to transient low voltage destabilization, the initial dc power is reduced, the reduced initial dc power is used as the new initial dc power, and the step of using the preset second stability criterion to determine whether the back-to-back dc power is the initial dc power, the power of the ac channel is the third power, and the ac channel fails is performed.
Alternatively, the back-to-back direct current power reduction can be achieved by adjusting the back-to-back direct current station control unit, and the power of the alternating current channel cannot be controlled autonomously, so that the back-to-back direct current power is reduced by adjusting the back-to-back direct current station control unit, and then the power of the alternating current channel is calculated by using the back-to-back direct current power flow, so that the power value of the alternating current channel is indirectly adjusted.
In an embodiment of the present application, the preset first stability criterion may be:
And when the back-to-back direct current power is the initial direct current power and the direct current channel fails, the alternating current bus voltage of the power grid is kept below a second preset threshold value within a preset time period, and the alternating current channel is judged to have no transient low-voltage instability. For example: the preset time period may be set to 1 second and the second preset threshold may be set to 0.75p.u.. Then the first stability criterion is set to: the voltage of the alternating current bus of 220kV and above is lower than 0.75p.u. after the direct current channel fails, the duration is longer than 1 second, or the damping ratio of the voltage oscillation curve is smaller than 0.005, so that the transient low-voltage instability of the alternating current channel can be judged.
For easy understanding, the following describes a specific example to illustrate the power distribution method of the power grid provided by the present application, as follows:
If the back-to-back direct current rated power of the power grid is 6000MW, the power grid is a four-circuit alternating current line. Then, firstly, when the back-to-back direct current power of the direct current channel is 0, the power flow of the alternating current channel corresponding to the first preset threshold value is calculated to be 8500MW, the 8500MW is taken as the first power of the alternating current channel, and at the moment, the power of the alternating current channel is transmitted from west to east. When the back-to-back direct current power of the direct current channel is 6000MW of back-to-back direct current rated power, the power flow of the alternating current channel corresponding to the first preset threshold value is 3500MW, 3500MW is used as the second power of the alternating current channel, at the moment, the back-to-back direct current power and the power of the alternating current channel are transmitted in the east-west direction, therefore, the product of the back-to-back direct current rated power and the second power is larger than zero, and 6000MW of the back-to-back direct current rated power and 3500MW of the second power of the alternating current channel are added, so that the target power is 9500MW.
At this time, comparing the first power 8500MW of the ac channel with the target power 9500MW, it can be seen that the target power is larger, so that the back-to-back rated power 6000MW corresponding to the target power is taken as the initial dc power.
When the back-to-back direct current rated power is 6000MW of initial direct current power, transient low voltage instability does not occur in an alternating current channel when a direct current single pole locking fault occurs in a direct current channel of a power grid, but when the direct current single pole locking fault occurs, the time that the transient voltage of the alternating current channel of the power grid is lower than 0.75p.u. exceeds 1 second, which means that the transient low voltage instability occurs in the alternating current channel, the initial direct current power is reduced by 6000MW, the reduced initial direct current power is used as new initial direct current power, and after repeated iterative calculation, when the initial direct current power is 4500MW, the direct current single pole locking fault occurs in the direct current channel of the power grid, or the direct current double pole locking fault simultaneously occurs, the transient low voltage instability does not occur in the alternating current channel.
At this time, the power of the ac channel is calculated to be 4800MW, and then, a second stability criterion is used to determine whether the ac channel is unstable due to transient low voltage when the back-to-back dc power is 4500MW, the ac channel power is 4800MW, and the ac channel fails. Through simulation calculation, when a single element fault or a combined element fault occurs in a receiving end alternating current system of an alternating current channel, transient low-voltage instability does not occur in the alternating current channel, the back-to-back direct current power of a power grid can be determined to be 4500MW, and the power of the alternating current channel is 4800MW, namely the power distribution scheme of the power grid.
Corresponding to the method shown in fig. 1, the embodiment of the present invention further provides a power distribution device for a power distribution system, which is used for implementing the method shown in fig. 1, where the power distribution device provided in the embodiment of the present invention may be introduced in a computer terminal or various mobile devices with reference to fig. 2, and as shown in fig. 2, the device may include:
A first power determining module 10, configured to determine, when back-to-back dc power of a dc channel is a first preset threshold, power of an ac channel corresponding to the first preset threshold, and take the power of the ac channel corresponding to the first preset threshold as a first power;
The second power determining module 20 is configured to determine, when the back-to-back dc power of the dc channel is a back-to-back dc rated power, the power of the ac channel corresponding to the back-to-back dc rated power, and take the power of the ac channel corresponding to the back-to-back dc rated power as the second power;
A target power obtaining module 30, configured to add the back-to-back direct current rated power and the second power to obtain a target power if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero;
An initial dc power determining module 40, configured to determine an initial dc power of the dc channel according to the first power of the ac channel and the target power;
the first failure determination module 50 is configured to determine whether a transient low-voltage instability occurs in the ac channel when the back-to-back dc power is the initial dc power and the dc channel fails according to a preset first stability criterion;
A third power determining module 60, configured to determine, when it is determined by using a preset first stability criterion that the back-to-back dc power is the initial dc power and the dc channel fails and it is determined that the ac channel has no transient low-voltage instability, the power of the ac channel corresponding to the initial dc power by using the initial dc power as the back-to-back dc power of the dc channel and using the power of the ac channel corresponding to the initial dc power as the third power;
A second failure determination module 70, configured to determine, according to a preset second stability criterion, whether a transient low-voltage instability occurs in the ac channel when the back-to-back dc power is the initial dc power, the power of the ac channel is the third power, and the ac channel fails;
The power distribution module 80 is configured to determine that the back-to-back dc power of the dc channel of the power grid is the initial dc power and the power of the ac channel is the third power when the back-to-back dc power is the initial dc power and the ac channel fails and the ac channel is determined to be not transient low-voltage unstable by using the preset second stability criterion.
As can be seen from the above technical solution, in the present application, when the back-to-back dc power of the dc channels is a first preset threshold, determining the power of the ac channel corresponding to the first preset threshold, and taking the power of the ac channel corresponding to the first preset threshold as the first power; when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power; if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power; determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power; judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset stability judging standard; if not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power; judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails by utilizing the stability judging standard; if not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power. According to the scheme, the power of the alternating current channel is determined under different back-to-back direct current powers, so that the initial direct current power of the power grid direct current channel is determined, then the initial direct current power is utilized to respectively determine whether the alternating current channel is unstable in transient voltage when the power grid back-to-back direct current channel is in fault and the power grid alternating current channel is in fault, if the alternating current channel is not unstable, the initial direct current power and the power of the alternating current channel corresponding to the initial direct current power are determined to be respectively used as the power of the direct current channel and the power of the alternating current channel, and therefore reasonable distribution of the power is achieved.
Further, the initial dc power determining module 40 may include:
The first initial direct current power determination submodule is used for taking the first power of the alternating current channel and the larger value of the target power as initial section power;
And the second initial direct current power determining sub-module is used for taking the back-to-back direct current power corresponding to the initial section power as the initial direct current power.
Further, the embodiment of the application provides power distribution equipment for a power grid. Optionally, fig. 3 shows a block diagram of a hardware structure of the power distribution apparatus of the power grid, and referring to fig. 3, the hardware structure of the power distribution apparatus of the power grid may include: at least one processor 01, at least one communication interface 02, at least one memory 03 and at least one communication bus 04.
In the embodiment of the present application, the number of the processor 01, the communication interface 02, the memory 03 and the communication bus 04 is at least one, and the processor 01, the communication interface 02 and the memory 03 complete communication with each other through the communication bus 04.
The processor 01 may be a central processing unit CPU, or an Application-specific integrated Circuit ASIC (Application SPECIFIC INTEGRATED Circuit), or one or more integrated circuits configured to implement embodiments of the present invention, or the like.
The memory 03 may include a high-speed RAM memory, and may further include a nonvolatile memory (non-volatile memory) or the like, such as at least one magnetic disk memory.
The memory stores a program, and the processor can call the program stored in the memory, and the program is used for executing the following power distribution method of the power grid, which comprises the following steps:
When back-to-back direct current power of a direct current channel is a first preset threshold value, determining power of an alternating current channel corresponding to the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
If the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power;
determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power;
judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset first stability judging standard;
If not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power;
Judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails according to a preset second stability judging standard;
If not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power. Alternatively, the refinement and expansion functions of the program may be referred to the description of the grid power distribution method in the method embodiment.
The embodiment of the application also provides a storage medium, which can store a program suitable for being executed by a processor, and when the program runs, the device where the storage medium is controlled to execute the following power distribution method of the power grid, comprising the following steps:
When back-to-back direct current power of a direct current channel is a first preset threshold value, determining power of an alternating current channel corresponding to the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
If the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power;
determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power;
judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset first stability judging standard;
If not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power;
Judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails according to a preset second stability judging standard;
If not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power.
In particular, the storage medium may be a computer-readable storage medium, which may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM.
Alternatively, the refinement and expansion functions of the program may be referred to the description of the grid power distribution method in the method embodiment.
In addition, functional modules in various embodiments of the present disclosure may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present disclosure may be embodied in essence or a part contributing to the prior art or a part of the technical solution, or in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a live device, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present disclosure.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for distributing power to a power grid, comprising:
When back-to-back direct current power of a direct current channel is a first preset threshold value, determining power of an alternating current channel corresponding to the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, determining the power of an alternating current channel corresponding to the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
If the product of the back-to-back direct current rated power and the second power is greater than or equal to zero, adding the back-to-back direct current rated power and the second power to obtain target power;
Determining initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power; the method specifically comprises the following steps: taking the first power of the alternating current channel and the larger value of the target power as initial section power; taking back-to-back direct current power corresponding to the initial section power as the initial direct current power; judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel fails by using a preset first stability judging standard;
If not, the initial direct current power is used as back-to-back direct current power of the direct current channel, the power of an alternating current channel corresponding to the initial direct current power is determined, and the power of the alternating current channel corresponding to the initial direct current power is used as third power;
Judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel fails according to a preset second stability judging standard;
If not, determining the back-to-back direct current power of the direct current channel of the power grid as the initial direct current power, and determining the power of the alternating current channel as the third power.
2. The method as recited in claim 1, further comprising:
And if the product of the back-to-back direct current rated power and the second power is smaller than zero, reducing the back-to-back direct current rated power, taking the reduced back-to-back direct current rated power as a new back-to-back direct current rated power, and returning to execute the step of determining the power of the alternating current channel corresponding to the back-to-back direct current rated power and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as the second power when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power.
3. The method as recited in claim 1, further comprising:
if the back-to-back direct current power is the initial direct current power and the direct current channel fails, the initial direct current power is reduced, the reduced initial direct current power is used as new initial direct current power, and the step of judging whether the alternating current channel fails or not by utilizing a preset first stability judging standard is performed.
4. The method as recited in claim 1, further comprising:
If the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power, and when the alternating current channel fails, the alternating current channel is subjected to transient low voltage instability, the initial direct current power is reduced, the reduced initial direct current power is used as new initial direct current power, and the step of judging whether the alternating current channel is subjected to transient low voltage instability or not by using a preset second stability judging standard is performed.
5. The method of claim 1, wherein the predetermined first stability criterion is:
And when the back-to-back direct current power is the initial direct current power and the direct current channel fails, the alternating current bus voltage of the power grid is kept below a second preset threshold value within a preset time period, and the alternating current channel is judged to have no transient low-voltage instability.
6. A power distribution device for an electrical network, comprising:
the first power determining module is used for determining the power of the alternating current channel corresponding to a first preset threshold value when the back-to-back direct current power of the direct current channel is the first preset threshold value, and taking the power of the alternating current channel corresponding to the first preset threshold value as first power;
The second power determining module is used for determining the power of the alternating current channel corresponding to the back-to-back direct current rated power when the back-to-back direct current power of the direct current channel is the back-to-back direct current rated power, and taking the power of the alternating current channel corresponding to the back-to-back direct current rated power as second power;
The target power obtaining module is used for adding the back-to-back direct current rated power and the second power to obtain target power if the product of the back-to-back direct current rated power and the second power is greater than or equal to zero;
The initial direct current power determining module is used for determining the initial direct current power of the direct current channel according to the first power of the alternating current channel and the target power;
The first fault judging module is used for judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power and the direct current channel is in fault by utilizing a preset first stability judging standard;
The third power determining module is used for determining the power of an alternating current channel corresponding to the initial direct current power as third power when the back-to-back direct current power is judged to be the initial direct current power by utilizing a preset first stability judging standard and the direct current channel fails and the initial direct current power is judged to be the back-to-back direct current power of the direct current channel when the alternating current channel is judged to not have transient low voltage instability;
The second fault judging module is used for judging whether the alternating current channel is subjected to transient low-voltage instability or not when the back-to-back direct current power is the initial direct current power, the power of the alternating current channel is the third power and the alternating current channel is in fault by utilizing a preset second stability judging standard;
The power distribution module of the electric network is used for determining that the back-to-back direct current power of the direct current channel of the electric network is the initial direct current power and the power of the alternating current channel is the third power when the back-to-back direct current power is the initial direct current power and the alternating current channel fails and the alternating current channel is judged to have no transient low-voltage instability;
Wherein, the initial direct current power determining module comprises:
The first initial direct current power determination submodule is used for taking the first power of the alternating current channel and the larger value of the target power as initial section power;
And the second initial direct current power determining sub-module is used for taking the back-to-back direct current power corresponding to the initial section power as the initial direct current power.
7. A grid power distribution device, comprising a memory and a processor;
The memory is used for storing programs;
The processor being configured to execute the program to perform the steps of the grid power distribution method according to any one of claims 1-5.
8. A storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the grid power distribution method according to any of claims 1-5.
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| WO2022016622A1 (en) * | 2020-07-22 | 2022-01-27 | 南京东博智慧能源研究院有限公司 | Adaptive optimization and control method in event of failure of true bipolar flexible direct-current power transmission system |
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| WO2022016622A1 (en) * | 2020-07-22 | 2022-01-27 | 南京东博智慧能源研究院有限公司 | Adaptive optimization and control method in event of failure of true bipolar flexible direct-current power transmission system |
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