CN110601178A - Method and system for determining extra-high voltage direct current restart strategy - Google Patents
Method and system for determining extra-high voltage direct current restart strategy Download PDFInfo
- Publication number
- CN110601178A CN110601178A CN201910739489.7A CN201910739489A CN110601178A CN 110601178 A CN110601178 A CN 110601178A CN 201910739489 A CN201910739489 A CN 201910739489A CN 110601178 A CN110601178 A CN 110601178A
- Authority
- CN
- China
- Prior art keywords
- strategy
- direct current
- restarting
- restart
- power grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a method and a system for determining an extra-high voltage direct current restart strategy, wherein the method comprises the following steps: determining operation parameter data of an alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state; sequentially checking the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence; and determining the restart strategy to be an extra-high voltage direct current restart strategy. When the restarting strategy of the extra-high voltage direct current of the safe and stable operation of the alternating current-direct current hybrid power grid is determined, the restarting strategy is determined according to the preset restarting strategy checking sequence, the implementation method has the characteristics of simplicity, practicability and high efficiency, manpower and material resources can be saved, and the economic benefit is improved.
Description
Technical Field
The invention relates to the field of safe and stable operation of an alternating current-direct current hybrid power grid, in particular to a method and a system for determining an extra-high voltage direct current restart strategy.
Background
In order to optimize the energy resource allocation of China and meet the economic growth demand of the east region, the high-capacity extra-high voltage direct current transmission project is put into operation continuously. By 12 months end in 2018, 9 ultrahigh voltage (+/-800 kV and above) direct-current transmission projects and 9 ultrahigh voltage (+/-800 kV and below) long-distance direct-current transmission projects are already in use in China. In addition, the system debugging of +/-1100 kV Changji-ancient spring and +/-800 kV Shanghai temple-Shandong extra-high voltage direct current transmission projects is completed in the early 2019, 11 extra-high voltage direct current transmission projects which are accumulated to be put into operation at that time are achieved, and the interconnection of the extra-high voltage direct current projects and a traditional alternating current power grid forms a large-scale alternating current-direct current series-parallel transmission pattern in China. During planning, debugging and operation of the alternating current-direct current hybrid power grid, a proper direct current restart strategy must be formulated by performing restart fault check on the direct current system, so that safe and stable operation of the alternating current-direct current system is ensured.
In a large-scale alternating current-direct current hybrid power grid, the common direct current restart strategy types mainly include: a bipolar two-all-drop restart strategy (strategy I), a bipolar two-all-drop restart strategy (strategy II), a unipolar two-all-drop restart strategy (strategy III), and a unipolar two-all-drop restart strategy (strategy IV). In actual engineering, the duration of the direct current restarting process may last 150-850 ms according to different starting times. The active power change curve of the direct current of the alternating current and direct current hybrid power grid during the successful restart of the two full-one-drop faults is shown in fig. 1; active power change curves of direct current of the alternating-current and direct-current hybrid power grid during the bipolar two-all-one-drop strategy restart failure lockout period, the unipolar two-all-one-drop strategy restart failure lockout period and the unipolar two-all-strategy restart failure lockout period are respectively shown in fig. 2(a), fig. 2(b) and fig. 2(c) and fig. 2 (d).
Calculating to know that when different types of faults occur in the alternating current-direct current hybrid power grid, the impact on the power grid after restarting is as follows from large to small: a bipolar two-all-drop restart strategy (strategy I), a bipolar two-all-drop restart strategy (strategy II), a unipolar two-all-drop restart strategy (strategy III), and a unipolar two-all-restart strategy (strategy IV).
In the simulation calculation process of the existing alternating current-direct current hybrid power grid, a unified direct current restart fault check flow and standard do not exist, and the method is obtained by traversing various possible restart fault checks and then summing, so that the calculation amount is large and the calculation efficiency is low.
Disclosure of Invention
The invention provides a method and a system for determining an extra-high voltage direct current (UHVDC) restart strategy, which aim to solve the problem of efficiently determining the DC restart strategy of an alternating current-direct current (AC-DC) series-parallel power grid.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for determining an extra-high voltage dc restart strategy, the method including:
determining operation parameter data of an alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state;
sequentially checking the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence;
and determining the restarting strategy to be an extra-high voltage direct current restarting strategy.
Preferably, the preset checking sequence sequentially comprises: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
Preferably, the sequentially checking the restart strategy after the fault of the extra-high voltage direct current according to a preset checking sequence includes:
step 1, selecting a restart strategy ranked as a first according to a preset checking sequence to check the restart strategy after the ultrahigh-voltage direct current fails;
step 2, determining the stability of the alternating current-direct current hybrid power grid after the restarting operation corresponding to the current restarting strategy, and obtaining a stability judgment result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
step 3, if the first judgment result and the second judgment result indicate that the alternating current-direct current hybrid power grid is in a stable state, taking a current restarting strategy as a restarting strategy for enabling the alternating current-direct current hybrid power grid to be in the stable state; and if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state, and when a next restarting strategy exists, reselecting the next restarting strategy to check the restarting strategy after the fault is performed on the extra-high voltage direct current, and returning to the step 2.
Preferably, wherein the method further comprises:
and when the next restarting strategy does not exist, adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy, and changing the operation mode of the alternating current-direct current hybrid power grid so as to determine the restarting strategy again.
Preferably, the operation parameter data of the ac/dc hybrid power grid includes: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
According to another aspect of the present invention, there is provided a system for determining an extra-high voltage direct current restart strategy, the system comprising:
the operation parameter data determining unit is used for determining operation parameter data of the alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state;
the restarting strategy checking unit is used for checking the restarting strategy after the fault is performed on the ultrahigh-voltage direct current in sequence according to a preset checking sequence;
and the restarting strategy determining unit is used for determining that the restarting strategy is an extra-high voltage direct current restarting strategy.
Preferably, the preset checking sequence sequentially comprises: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
Preferably, the restarting strategy checking unit sequentially checks the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence, and includes:
the restarting strategy checking module is used for selecting a restarting strategy which is sorted into the first order according to a preset checking sequence to check the restarting strategy after the fault is carried out on the extra-high voltage direct current;
the stability judgment result acquisition module is used for determining the stability of the alternating current-direct current hybrid power grid after the restarting operation corresponding to the current restarting strategy and acquiring a stability judgment result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
the judging module is used for taking the current restarting strategy as a restarting strategy for enabling the alternating current-direct current hybrid power grid to be in a stable state if the first judging result and the second judging result both indicate that the alternating current-direct current hybrid power grid is in the stable state; and if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state, and when a next restarting strategy exists, the next restarting strategy is reselected to check the restarting strategy after the fault is performed on the extra-high voltage direct current, and the extra-high voltage direct current enters a stability judgment result acquisition module.
Preferably, wherein the system further comprises:
and the operation parameter data adjusting unit is used for adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy when the next restarting strategy does not exist, changing the operation mode of the alternating current-direct current hybrid power grid and re-determining the restarting strategy.
Preferably, the operation parameter data of the ac/dc hybrid power grid includes: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
The invention provides a method and a system for determining an extra-high voltage direct current restart strategy, which comprises the following steps: determining operation parameter data of an alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state; sequentially checking the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence; and determining a restart strategy for enabling the alternating current-direct current hybrid power grid to be in a stable state as an extra-high voltage direct current restart strategy. When the restarting strategy of the extra-high voltage direct current for safe and stable operation of the alternating current-direct current hybrid power grid is determined, the restarting strategy is determined by checking the preset restarting strategy checking sequence, and the implementation method has the characteristics of simplicity, practicability and high efficiency, and can save manpower and material resources and improve economic benefit.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is an active power change curve of direct current of an alternating current-direct current hybrid power grid during a two-all-one-drop fault restart success period;
fig. 2(a) is an active power change curve of a direct current of an ac/dc hybrid power grid during a bipolar two-drop fault restart failure latch-up period;
fig. 2(b) is an active power change curve of the direct current of the ac/dc series-parallel power grid during the restart failure lockout period of the bipolar two-fault;
fig. 2(c) is an active power change curve of a direct current of an alternating current-direct current hybrid power grid during a single-pole two-all-drop fault restart failure lock-up period;
fig. 2(d) is an active power change curve of a direct current of an ac/dc hybrid power grid during a single-pole two-full fault restart failure lockout period;
FIG. 3 is a flowchart of a method 300 for determining an extra-high voltage DC restart strategy according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method 400 for determining an extra-high voltage DC restart strategy according to an embodiment of the present invention; and
fig. 5 is a schematic diagram of a system 500 for determining a specific hvdc restart strategy according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 3 is a flowchart of a method 300 for determining a dc restart strategy of an ac/dc hybrid grid according to an embodiment of the present invention. As shown in fig. 3, when determining the extra-high voltage dc restart policy for safe and stable operation of the ac/dc series-parallel power grid, the method 300 for determining the extra-high voltage dc restart policy according to the embodiment of the present invention checks the preset restart policy checking sequence, thereby determining the restart policy. The method 300 for determining the extra-high voltage direct current restart strategy provided by the embodiment of the invention starts from step 301, and determines the operation parameter data of the alternating current and direct current hybrid power grid in step 301 so as to enable the alternating current and direct current hybrid power grid to be in an operation state.
Preferably, the operation parameter data of the ac/dc hybrid power grid includes: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
In the embodiment of the invention, firstly, a checking operation mode needs to be selected, and the direct current power, the alternating current section power at a transmitting end, the alternating current section power at a receiving end and the power generation load of the alternating current-direct current hybrid power grid are determined. And then determining an extra-high voltage direct current restart strategy of the alternating current and direct current hybrid power grid in the operation mode.
In step 302, the restart strategy after the fault is checked sequentially according to a preset checking sequence.
Preferably, the preset checking sequence sequentially comprises: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
In the embodiment of the invention, the checking sequence of the restarting strategy is set according to the energy impact of the restarting strategy on the system, so that the checking efficiency of the restarting strategy is greatly improved.
Preferably, the sequentially checking the restart strategy after the fault of the extra-high voltage direct current according to a preset checking sequence includes:
in step 3021, selecting a restart strategy sorted as the first according to a preset check sequence to check the restart strategy after the fault of the extra-high voltage direct current;
in step 3022, determining the stability of the ac/dc hybrid power grid after the restart operation corresponding to the current restart strategy, and obtaining a stability determination result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
in step 3023, if the first determination result and the second determination result both indicate that the ac/dc hybrid power grid is in a stable state, using the current restart policy as a restart policy for enabling the ac/dc hybrid power grid to be in a stable state; and if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state, and when a next restarting strategy exists, reselecting the next restarting strategy to check the restarting strategy after the fault is performed on the extra-high voltage direct current, and returning to the step 3022.
Preferably, wherein the method further comprises: and when the next restarting strategy does not exist, adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy, changing the operation mode of the alternating current-direct current hybrid power grid, and re-determining the restarting strategy.
In the embodiment of the invention, when the stability of the transmitting-end power grid and the receiving-end power grid is stable, the alternating current-direct current hybrid power grid can be in a stable state. The stability of the transmission end power grid comprises: transient overvoltage stabilization, voltage stabilization, frequency stabilization, dynamic stabilization and power angle stabilization. Receiving end electric wire netting stability includes: voltage stabilization, frequency stabilization, dynamic stabilization and power angle stabilization.
In step 303, it is determined that the restart strategy is an extra high voltage dc restart strategy.
Fig. 4 is a flowchart of a method 400 for determining an extra-high voltage dc restart strategy according to an embodiment of the present invention. As shown in fig. 4, in the embodiment of the present invention, the step of determining the dc restart strategy of the ac/dc hybrid grid includes:
and S1, selecting a checking operation mode, and determining the direct current power level, the alternating current section power of the transmitting-end power grid, the alternating current section power of the receiving-end power grid, the power generation load and the like to enable the alternating current-direct current series-parallel power grid to be in an operation state.
And S2, setting the AC/DC hybrid power grid fault, checking a bipolar two-pole all-drop restart strategy, determining the stability of the AC/DC hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that a bipolar two-drop one-drop restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S3.
And S3, performing bipolar two-pole full restart strategy checking, determining the stability of the alternating current-direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that the bipolar two-pole full-restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S4.
And S4, performing single-pole two-all-one-drop restart strategy checking, determining the stability of the alternating current and direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that a single-pole two-drop one-drop restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S5.
And S5, performing single-pole two-full restart strategy checking, determining the stability of the alternating current-direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that the single-pole two-full restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S6.
And S6, performing bipolar-one-drop restart strategy checking, determining the stability of the alternating current-direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that a bipolar-one-drop restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S7.
And S7, performing bipolar-one full restart strategy checking, determining the stability of the alternating current-direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that a bipolar-I full-restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S8.
And S8, performing single-pole-one-drop restart strategy checking, determining the stability of the alternating current and direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining that the single-pole-all-one-drop restarting strategy is a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, the process proceeds to S9.
And S9, performing single-pole-full restart strategy checking, determining the stability of the alternating current-direct current hybrid power grid after restart operation, and acquiring a stability judgment result.
Wherein, if the alternating current-direct current series-parallel connection electric wire netting is in steady state after this restart strategy is checked, include: if the check result is that the restarting operation fails and locking occurs, and the AC-DC hybrid power grid is in a stable state after the restarting operation succeeds, determining a single-pole-full restarting strategy as a restarting strategy which enables the AC-DC hybrid power grid to be in a stable state after the fault check, namely an extra-high voltage DC restarting strategy; otherwise, there is no corresponding restart strategy, and the process proceeds to S10.
S10, when the next restart strategy does not exist, adjusting the operation parameter data of the alternating current and direct current hybrid power grid according to a preset data adjustment strategy, changing the operation mode of the alternating current and direct current hybrid power grid, namely determining a new direct current power level, a sending end power grid alternating current section power, a receiving end power grid alternating current section power, a power generation load and the like, enabling the alternating current and direct current hybrid power grid to be in a new operation state, returning to the step S2, and determining the extra-high voltage direct current restart strategy of the alternating current and direct current hybrid network in the new operation mode.
Fig. 5 is a schematic diagram of a system 500 for determining a specific hvdc restart strategy according to an embodiment of the present invention. As shown in fig. 5, a system 500 for determining an extra-high voltage dc restart strategy according to an embodiment of the present invention includes: an operation parameter data determination unit 501, a restart policy check unit 502, and a restart policy determination unit 503.
Preferably, the operation parameter data determining unit 501 is configured to determine operation parameter data of the ac/dc hybrid grid, so that the ac/dc hybrid grid is in an operation state.
Preferably, the restart policy checking unit 502 is configured to sequentially check the restart policy after the fault is performed on the extra-high voltage direct current according to a preset checking sequence.
Preferably, the preset checking sequence sequentially comprises: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
Preferably, the checking unit 502 for the restart strategy sequentially checks the restart strategy after the fault is performed on the extra-high voltage direct current according to a preset checking sequence, including:
the restarting strategy checking module is used for selecting a restarting strategy which is sorted into the first order according to a preset checking sequence to check the restarting strategy after the fault is carried out on the extra-high voltage direct current;
the stability judgment result acquisition module is used for determining the stability of the alternating current-direct current hybrid power grid after the restarting operation corresponding to the current restarting strategy and acquiring a stability judgment result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
the judging module is used for taking the current restarting strategy as a restarting strategy for enabling the alternating current-direct current hybrid power grid to be in a stable state if the first judging result and the second judging result both indicate that the alternating current-direct current hybrid power grid is in the stable state; and if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state, and when a next restarting strategy exists, the next restarting strategy is reselected to check the restarting strategy after the fault is performed on the extra-high voltage direct current, and the extra-high voltage direct current enters a stability judgment result acquisition module.
Preferably, the restart policy determining unit 503 is configured to determine that the restart policy is an extra-high voltage direct current restart policy.
Preferably, wherein the system further comprises: and the operation singular data adjusting unit is used for operating the parameter data adjusting unit and adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy when the next restarting strategy does not exist, so that the operation mode of the alternating current-direct current hybrid power grid is changed, and the restarting strategy is determined again.
Preferably, the operation parameter data of the ac/dc hybrid power grid includes: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
The system 500 for determining a specific high-voltage dc restart policy according to an embodiment of the present invention corresponds to the method 300 for determining an extra-high-voltage dc restart policy according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated. As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above examples, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for determining an extra-high voltage direct current restart strategy is characterized by comprising the following steps:
determining operation parameter data of an alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state;
sequentially checking the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence;
and determining the restarting strategy to be an extra-high voltage direct current restarting strategy.
2. The method of claim 1, wherein the predetermined checking order comprises, in order: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
3. The method according to claim 1, wherein the sequentially checking the restart strategy after the fault of the extra-high voltage direct current according to a preset checking sequence comprises:
step 1, selecting a restart strategy ranked as a first according to a preset checking sequence to check the restart strategy after the fault of the extra-high voltage direct current;
step 2, determining the stability of the alternating current-direct current hybrid power grid after the restarting operation corresponding to the current restarting strategy, and obtaining a stability judgment result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
step 3, if the first judgment result and the second judgment result indicate that the alternating current-direct current hybrid power grid is in a stable state, taking a current restarting strategy as a restarting strategy for enabling the alternating current-direct current hybrid power grid to be in the stable state; and if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state, and when a next restarting strategy exists, reselecting the next restarting strategy to check the restarting strategy after the fault is performed on the extra-high voltage direct current, and returning to the step 2.
4. The method of claim 3, further comprising:
and when the next restarting strategy does not exist, adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy, changing the operation mode of the alternating current-direct current hybrid power grid, and re-determining the restarting strategy.
5. The method according to any one of claims 1-4, wherein the operational parameter data of the AC/DC hybrid grid comprises: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
6. A system for determining an extra-high voltage direct current restart strategy, the system comprising:
the operation parameter data determining unit is used for determining operation parameter data of the alternating current-direct current hybrid power grid so as to enable the alternating current-direct current hybrid power grid to be in an operation state;
the restarting strategy checking unit is used for sequentially checking the restarting strategy after the fault of the extra-high voltage direct current according to a preset checking sequence;
and the restarting strategy determining unit is used for determining that the restarting strategy is an extra-high voltage direct current restarting strategy.
7. The system of claim 6, wherein the predetermined checking sequence comprises, in order: a bipolar two-all-drop restart strategy check, a unipolar two-all-drop restart strategy check, a bipolar one-all-drop restart strategy check, a unipolar one-all-drop restart strategy check, and a unipolar one-all-restart strategy check.
8. The system according to claim 6, wherein the restart strategy checking unit, according to a preset checking sequence, sequentially checks the restart strategy after the fault of the extra-high voltage direct current, and comprises:
the restarting strategy checking module is used for selecting a restarting strategy which is sorted into the first order according to a preset checking sequence to check the restarting strategy after the fault is carried out on the extra-high voltage direct current;
the stability judgment result acquisition module is used for determining the stability of the alternating current-direct current hybrid power grid after the restarting operation corresponding to the current restarting strategy and acquiring a stability judgment result; wherein the stability determination result includes: a first judgment result corresponding to locking after the restarting operation fails and a second judgment result corresponding to the restarting operation succeeds;
the judging module is used for taking the current restarting strategy as a restarting strategy for enabling the alternating current-direct current hybrid power grid to be in a stable state if the first judging result and the second judging result both indicate that the alternating current-direct current hybrid power grid is in the stable state; and the controller is used for reselecting the next restart strategy to check the restart strategy after the fault is performed on the extra-high voltage direct current if the first judgment result or the second judgment result indicates that the alternating current-direct current hybrid power grid is in an unstable state and the next restart strategy exists, and entering a stability judgment result acquisition module.
9. The system of claim 8, further comprising:
and the operation parameter data adjusting unit is used for adjusting the operation parameter data of the alternating current-direct current hybrid power grid according to a preset data adjusting strategy when the next restarting strategy does not exist, changing the operation mode of the alternating current-direct current hybrid power grid and re-determining the restarting strategy.
10. The system according to any one of claims 6-9, wherein the operational parameter data of the ac/dc hybrid grid comprises: the direct current power, the alternating current section power of the transmitting end, the alternating current section power of the receiving end and the power generation load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910739489.7A CN110601178A (en) | 2019-08-12 | 2019-08-12 | Method and system for determining extra-high voltage direct current restart strategy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910739489.7A CN110601178A (en) | 2019-08-12 | 2019-08-12 | Method and system for determining extra-high voltage direct current restart strategy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110601178A true CN110601178A (en) | 2019-12-20 |
Family
ID=68853981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910739489.7A Pending CN110601178A (en) | 2019-08-12 | 2019-08-12 | Method and system for determining extra-high voltage direct current restart strategy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110601178A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713620A (en) * | 2020-11-23 | 2021-04-27 | 中国电力科学研究院有限公司 | Method and system for analyzing transmission capacity of extra-high voltage alternating current-direct current coupling system |
| CN113036796A (en) * | 2021-03-10 | 2021-06-25 | 广东电网有限责任公司 | Method and system for optimizing direct current restart control parameters |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610151A (en) * | 2015-12-14 | 2016-05-25 | 中国电力科学研究院 | Extra-high voltage direct-current restart simulation optimization method |
| CN107221945A (en) * | 2017-05-15 | 2017-09-29 | 中国电力科学研究院 | A kind of UHVDC Transmission Lines forecast failure aid decision-making method and device |
| CN107785876A (en) * | 2017-10-25 | 2018-03-09 | 南方电网科学研究院有限责任公司 | The control method that a kind of DC line fault is restarted |
-
2019
- 2019-08-12 CN CN201910739489.7A patent/CN110601178A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610151A (en) * | 2015-12-14 | 2016-05-25 | 中国电力科学研究院 | Extra-high voltage direct-current restart simulation optimization method |
| CN107221945A (en) * | 2017-05-15 | 2017-09-29 | 中国电力科学研究院 | A kind of UHVDC Transmission Lines forecast failure aid decision-making method and device |
| CN107785876A (en) * | 2017-10-25 | 2018-03-09 | 南方电网科学研究院有限责任公司 | The control method that a kind of DC line fault is restarted |
Non-Patent Citations (5)
| Title |
|---|
| G. EBNER: "Fault arc extinction and system re-start on HVDC transmission lines using LCC or VSC full-bridge converters with integrated arcrecovery simulation models", 《13TH IET INTERNATIONAL CONFERENCE ON AC AND DC POWER TRANSMISSION (ACDC 2017)》 * |
| 刘明松: "弱受端系统直流再启动方案", 《电力系统自动化》 * |
| 周红阳: "直流输电系统再启动功能改进措施", 《电力系统自动化》 * |
| 贾俊川: "特高压直流双极相继故障再启动策略", 《电力系统自动化》 * |
| 雷霄: "龙政直流闭锁事件分析及降压再启动直流电压偏高抑制", 《电力系统自动化》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713620A (en) * | 2020-11-23 | 2021-04-27 | 中国电力科学研究院有限公司 | Method and system for analyzing transmission capacity of extra-high voltage alternating current-direct current coupling system |
| CN112713620B (en) * | 2020-11-23 | 2022-11-25 | 中国电力科学研究院有限公司 | Method and system for analyzing power transmission capacity of extra-high voltage alternating current-direct current coupling system |
| CN113036796A (en) * | 2021-03-10 | 2021-06-25 | 广东电网有限责任公司 | Method and system for optimizing direct current restart control parameters |
| CN113036796B (en) * | 2021-03-10 | 2023-01-20 | 广东电网有限责任公司 | Method and system for optimizing direct current restart control parameters |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110601245A (en) | Method and system for checking transient overvoltage after extra-high voltage direct current fault | |
| CN107765112B (en) | Converter valve overcurrent turn-off test circuit, method and device | |
| CN110601178A (en) | Method and system for determining extra-high voltage direct current restart strategy | |
| CN110544953B (en) | Method and system for checking steady-state voltage after extra-high voltage direct current fault | |
| CN113381445A (en) | Phase modulator optimal configuration method and system for restraining transient overvoltage of new energy | |
| CN109327037B (en) | Method and device for preventing, controlling and setting hierarchical access direct current commutation failure | |
| CN115276072A (en) | Method, device, terminal and medium for inhibiting subsequent commutation failure of direct current system | |
| CN112152227B (en) | Direct current blocking sending end power grid overvoltage phase calculation method and device considering phase modulator influence | |
| CN110266032B (en) | Feasible domain description method for HVDC system commutation process | |
| CN107069747A (en) | A kind of minimum start-up mode based on regional voltage stabilization determines method | |
| CN110581564B (en) | Method and system for determining extra-high voltage direct current commutation failure accelerated protection strategy | |
| CN108649782B (en) | Parameter setting method and device of dynamic energy leakage device and simulation equipment | |
| CN110137998A (en) | Pure electrical quantity commutation failure criterion method and system for safety and stability control device | |
| CN115498690A (en) | Method and system for acquiring low voltage ride through control parameter information | |
| CN114844130A (en) | Phase modulator optimal configuration method and system for improving voltage intensity of power grid | |
| CN112653170A (en) | Direct-current locking optimization cutting method for rigid weak cross-linking combined delivery system | |
| CN107994619B (en) | Method and system for optimizing startup mode of multi-feed direct-current transmission system | |
| CN112054547A (en) | Receiving-end multi-drop-point hybrid direct-current power transmission system starting method and device and storage medium | |
| CN111162529B (en) | Method and device for calculating alternating current bus voltage operating range of series-parallel power grid | |
| CN112072676B (en) | Alternating current-direct current parallel system control protection optimization method for strong oscillation of alternating current power grid | |
| CN111355253B (en) | System and method for determining transient overvoltage of sending end of multi-direct-current sending system | |
| CN108761304B (en) | Parameter setting method and device of dynamic energy leakage device and simulation equipment | |
| CN113794203B (en) | Method and system for determining overvoltage during direct current fault of new energy direct current delivery system | |
| CN111327062B (en) | Method and device for evaluating emergency stability control effect of energy storage station | |
| CN116247685A (en) | Method and device for checking reactive switching strategy of extra-high voltage alternating-current transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191220 |