CN112165105A - Optimization method of direct current transmission control protection system during strong oscillation period of alternating current system - Google Patents
Optimization method of direct current transmission control protection system during strong oscillation period of alternating current system Download PDFInfo
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- CN112165105A CN112165105A CN202010897081.5A CN202010897081A CN112165105A CN 112165105 A CN112165105 A CN 112165105A CN 202010897081 A CN202010897081 A CN 202010897081A CN 112165105 A CN112165105 A CN 112165105A
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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 invention discloses an optimization method of a direct current transmission control protection system during strong oscillation of an alternating current system, which is used for acquiring running state data of the alternating current and direct current network system; identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data; when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time; according to the method, the direct-current control protection logic is automatically switched by recognizing the step-out oscillation of the direct-current transmission receiving end alternating-current network, so that the commutation failure protection is switched to a long delay fixed value, the long delay fixed value of the commutation failure protection is guaranteed to be larger than the disconnection fixed value of the receiving end alternating-current system, the direct current cannot be locked before the receiving end alternating-current network is disconnected and an oscillation source is isolated, the secondary impact on the receiving end power grid caused by the direct-current locking is avoided, and the system stability is guaranteed.
Description
Technical Field
The disclosure relates to the technical field of power systems, in particular to an optimization method of a direct-current power transmission control protection system during strong oscillation of an alternating-current system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The existing power grid is mostly a large power grid system comprising alternating current and direct current series-parallel connection, the alternating current system is easy to oscillate after the system is disturbed, and the system can be divided into low-frequency oscillation, out-of-step oscillation, subsynchronous oscillation, supersynchronous oscillation and the like according to the oscillation degree (frequency) of the system. The direct-current transmission system has certain oscillation damping control characteristics, and when the oscillation frequency is greater than 10Hz, the direct-current transmission control system can realize the self-adaptive damping of oscillation; however, when the oscillation frequency is less than 10Hz, an oscillation damping controller is added.
The inventor of the present disclosure finds that when the ac system is in step-out oscillation, a great deal of research is conducted by many experts and scholars on the two aspects of ac grid step-out oscillation modal parameters and grid disconnection measures, but the research conducted on the step-out oscillation of the ac system in the ac/dc hybrid large grid and the response characteristics of the dc control protection system is less. Therefore, in the multi-feed-in direct current transmission system, when the alternating current system oscillates, the direct current system lacks control strategy support, so that the direct current protection response is not timely, and large power grid instability or collapse is easily caused.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides an optimization method of a direct current transmission control protection system during strong oscillation of an alternating current system, and provides an optimized direct current control protection logic, direct current transmission is not locked in the early stage of step-out oscillation of the alternating current system, so that sufficient time is reserved for system disconnection, the alternating current system disconnection is faster than direct current locking time, finally, the direct current transmission system can be protected to operate without locking and stopping operation, and the stability of an alternating current-direct current hybrid power grid can be greatly improved.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the disclosure provides an optimization method of a direct current power transmission control protection system during strong oscillation of an alternating current system.
A method for optimizing a direct current transmission control protection system during strong oscillation of an alternating current system comprises the following steps:
acquiring running state data of an alternating current and direct current grid system;
identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
A second aspect of the present disclosure provides an optimization system for a dc power transmission control protection system during strong oscillation of an ac system.
An optimization system for a direct current power transmission control protection system during strong oscillation of an alternating current system, comprising:
a data acquisition module configured to: acquiring running state data of an alternating current and direct current grid system;
an oscillation identification module configured to: identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
an optimization control module configured to: when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
A third aspect of the present disclosure provides a computer-readable storage medium, on which a program is stored, which when executed by a processor implements the steps in the optimization method of the dc power transmission control protection system during strong oscillation of the ac system according to the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides an electronic device, including a memory, a processor, and a program stored in the memory and executable on the processor, where the processor executes the program to implement the steps in the method for optimizing a dc power transmission control protection system during strong oscillation of an ac system according to the first aspect of the present disclosure.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the method, the system, the medium and the electronic equipment, the direct current power transmission system cannot be locked in the early stage of the occurrence of the out-of-step oscillation on the inversion side, the phase commutation failure protection time fixed value is prolonged in the time window, and meanwhile, the disconnection time of the inversion side system is ensured to be smaller than the phase commutation failure protection time fixed value, so that the direct current power transmission system keeps running without being locked and stopped, and the stability of an alternating current-direct current power grid is greatly improved.
2. According to the method, the system, the medium and the electronic equipment, the optimized direct current control protection logic is provided, direct current transmission is not locked in the early stage of step-out oscillation of an alternating current system, sufficient time is reserved for system disconnection, the alternating current system disconnection is faster than direct current locking time, finally the direct current transmission system can be protected to run without locking and stopping running, and the stability of an alternating current and direct current hybrid power grid can be greatly improved.
3. According to the method, the system, the medium and the electronic equipment, when the oscillation center is located in the position of the inverter side alternating current network and the oscillation frequency is out-of-step oscillation with the frequency less than 10Hz, the fixed value of the direct current transmission commutation failure protection time is automatically prolonged (the fixed value of the conventional direct current commutation failure protection time is 2.6 seconds), and meanwhile, the fixed value of the inverter side alternating current system disconnection time is ensured to be smaller than the prolonged commutation failure protection time fixed value, so that the alternating current system is ensured to complete disconnection before direct current locking and isolate an oscillation source, secondary impact on the inverter side alternating current network due to direct current locking during the out-of-step oscillation period of the inverter side alternating current network is reduced, and the risk of causing breakdown of the power system is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic flowchart of an optimization method of a dc power transmission control protection system during strong oscillation of an ac system according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic structural diagram of an ac/dc series-parallel large grid system provided in embodiment 1 of the present disclosure; wherein, the direct current 1 and the direct current 2 are the extra-high voltage direct current transmission of +/-800 kV, and are respectively accessed to 500kV and 1000kV alternating current networks of a receiving-end power grid in a layered access mode; and D, high-voltage direct-current transmission with the direct current 3 being +/-660 is accessed to a receiving-end power grid 500kV alternating-current network.
Fig. 3 is a panoramic view of dc oscillation provided in embodiment 1 of the present disclosure before optimization of a control protection system; wherein (a) is a direct current 3 oscillation panoramic picture, (b) is a direct current 1 oscillation panoramic picture, and (c) is a direct current 2 oscillation panoramic picture.
Fig. 4 is a panoramic view of the dc 3 oscillation before the control protection system is optimized according to embodiment 1 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides an optimization method of a dc power transmission control protection system during strong oscillation of an ac system, including the following steps:
identifying the position of an out-of-step oscillation center and an oscillation mode, and automatically prolonging the fixed value of the direct-current transmission commutation failure protection time (the fixed value of the conventional direct-current commutation failure protection time is 2.6 seconds at present) when the oscillation center is at the position of an inverter side alternating-current network and is out-of-step oscillation with the oscillation frequency less than 10 Hz;
and meanwhile, the disconnection time constant value of the inversion side alternating current system is controlled to be smaller than the prolonged commutation failure protection time constant value, so that the fact that the disconnection of the alternating current system is completed and an oscillation source is isolated before direct current locking is ensured, and the risk of electric power system breakdown caused by secondary impact on the inversion side alternating current network due to direct current locking during the step-out oscillation period of the inversion side alternating current network is reduced.
As shown in fig. 2, for the alternating current/direct current hybrid large power grid system, a receiving end adopts an actual alternating current/direct current power grid framework of a certain province, comprises three direct current transmission projects, and adopts PSCAD/EMTDC simulation software for modeling operation.
The three DC rated total transmission powers are 24000MW, and the DC power transmission control protection system in the PSCAD model is modified necessarily on the basis of the actual control protection system program, so that the requirement of off-line simulation can be met.
The receiving end alternating current power grid framework reserves 3-4 layers of 500kV power grids outside the three receiving end converter stations, and the rest 500kV power grids are equivalent; equivalence of all 220kV power grids; and a complete 1000kV power grid is reserved, and three direct-current rectifier station alternating-current power grids adopt equivalent power supplies.
The oscillation center of the receiving-end power grid is located in the 500kV alternating current power grid near the direct current 3 inverter station, and the oscillation starting time is 12s, as shown in fig. 3.
As is known from the pole I dc voltage and the pole II dc voltage in fig. 3 (a), the oscillation amplitude and the oscillation frequency gradually increase after the 12s time; the 1 st commutation failure occurs at about 14.4s ("commutation failure detected" signal is 1); a low ac voltage is detected at about 16.5s ("ac voltage low" signal is 1); commutation failure protection action at about 17.7s ("commutation failure action", commutation failure protection action time constant value of 2.6 s); and after the phase-change failure protection action, a bypass pair is thrown (the signal of the bypass pair is 1), the unlocking signal disappears (the signal of the unlocking signal is 0), and logic is locked according to the inverter station (the signal of the locking signal is kept at 0).
It can be seen from this example that, since the fixed value of the commutation failure protection time is 2.6s, continuous commutation failure occurs in the direct current 3 during the out-of-step oscillation of the receiving-end power grid, and 2.6 direct current blocking is performed after the first commutation failure occurs. At this time, the receiving-end AC network does not complete disconnection, and the locking of the DC 3 brings secondary impact to the receiving-end AC network.
The 500kV and 1000kV alternating current networks of the direct current 1 and the direct current 2 which are at a distance from the oscillation center of the inversion station 3 have oscillation fluctuation (the direct current voltages in (b) and (c) of the figure 3 have oscillation fluctuation); the 1 st commutation failure of the direct current 1 and the direct current 2 occurs later than the direct current 3 of the oscillation center (about 16.8s, the signal of (b) in fig. 3 indicates that the commutation failure H is detected as 1, and the signal indicates that the commutation failure L is detected; and (c) in fig. 3 indicates that the commutation failure L is detected); commutation failure protection has no action (fig. 3 (b) and (c) 'commutation failure action H' and 'commutation failure action L' signals are both 0).
By the optimization method provided by the embodiment, when it is identified that the receiving-end alternating current network generates out-of-step oscillation and the oscillation frequency is less than 10Hz, the fixed value of the commutation failure protection time with long delay is automatically selected through the parameter switching function of the direct current protection program, and meanwhile, the fixed value of the splitting time of the receiving-end alternating current network is shortened, and the splitting time is ensured to be less than the prolonged fixed value of the commutation failure protection time. The optimized dc 3 oscillation panorama is shown in fig. 4.
Fig. 4 (a) shows the pole I dc voltage and the pole II dc voltage, and the oscillation amplitude and the oscillation frequency gradually increase after the 12s time; the 1 st commutation failure occurs at about 14.4s ("commutation failure detected" signal is 1); a low ac voltage is detected at about 16.5s ("ac voltage low" signal is 1).
After the receiving-end network is detected to generate step-out oscillation, the fixed value of the commutation failure protection time of the direct-current 3-control protection program is automatically switched to long delay, meanwhile, the fixed value of the disconnection time of the receiving-end alternating-current network is shortened, the system disconnects the isolated oscillation source at the time of 17s, commutation failure protection does not act (the signal of the commutation failure act is always 0), direct current does not block (the signal of the blocking is kept to be 0), and the system recovers stable operation.
It will be appreciated that in other embodiments, it may be preferable to de-train the ac system of out-of-step oscillations during the first two cycles of ac system oscillation, the time to de-train being within 3 seconds of the start of oscillation.
Example 2:
the embodiment 2 of the present disclosure provides an optimization system of a dc power transmission control protection system during strong oscillation of an ac system, including:
a data acquisition module configured to: acquiring running state data of an alternating current and direct current grid system;
an oscillation identification module configured to: identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
an optimization control module configured to: when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
The working method of the system is the same as the optimization method of the direct-current power transmission control protection system in the strong oscillation period of the alternating-current system provided in embodiment 1, and details are not repeated here.
Example 3:
the embodiment 3 of the present disclosure provides a computer-readable storage medium, on which a program is stored, where the program, when executed by a processor, implements the steps in the method for optimizing a dc power transmission control protection system during strong oscillation of an ac system according to embodiment 1 of the present disclosure, where the steps are:
acquiring running state data of an alternating current and direct current grid system;
identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
The detailed steps are the same as the optimization method of the direct current power transmission control protection system during the strong oscillation period of the alternating current system provided in embodiment 1, and are not described again here.
Example 4:
the embodiment 4 of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, where the processor executes the program to implement the steps in the method for optimizing a dc power transmission control protection system during strong oscillation of an ac system according to embodiment 1 of the present disclosure, where the steps are as follows:
acquiring running state data of an alternating current and direct current grid system;
identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
The detailed steps are the same as the optimization method of the direct current power transmission control protection system during the strong oscillation period of the alternating current system provided in embodiment 1, and are not described again here.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A method for optimizing a direct current transmission control protection system during strong oscillation of an alternating current system is characterized by comprising the following steps:
acquiring running state data of an alternating current and direct current grid system;
identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
2. The method of optimizing a dc power transmission control protection system during strong oscillations in an ac system of claim 1, wherein said predetermined frequency is 10 Hz.
3. The method according to claim 1, wherein the dc power transmission control protection system during strong oscillation of the ac system is optimized such that the dc power transmission commutation failure protection time is set to a value corresponding to a time interval from occurrence of a commutation failure to occurrence of a commutation failure protection action.
4. The method according to claim 3, wherein the constant value of the protection time for the failed DC power transmission commutation is extended on the basis of 2.6 seconds.
5. The method according to claim 1, wherein the commutation failure protection action signal is zero and the dc system blocking signal is zero before the system disconnects the isolated oscillation source.
6. The method of optimizing a dc power transmission control protection system during strong oscillations in an ac system as claimed in claim 1, wherein the ac system is de-cascaded from step-out oscillations in the first two cycles of ac system oscillation.
7. The method according to claim 1, wherein the disconnection time is within 3 seconds of the start of oscillation.
8. An optimization system for a direct current transmission control protection system during strong oscillation of an alternating current system, comprising:
a data acquisition module configured to: acquiring running state data of an alternating current and direct current grid system;
an oscillation identification module configured to: identifying the position of an alternating current oscillation center and an oscillation mode according to the acquired running state data;
an optimization control module configured to: when the oscillation center is at the position of the AC network of the inverter side and the oscillation frequency is out-of-step oscillation with the frequency less than the preset frequency, the fixed value of the commutation failure protection time of the DC transmission is prolonged, and the fixed value of the splitting time of the AC system of the inverter side is controlled to be less than the prolonged fixed value of the commutation failure protection time.
9. A computer-readable storage medium, on which a program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method for optimizing a dc power transmission control protection system during strong oscillations of an ac system according to any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps in the method for optimizing a dc power transmission control protection system during strong oscillations of an ac system according to any of claims 1 to 7.
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