CN115333098A - Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system - Google Patents
Method, device and equipment for sequential locking treatment of double valve banks of multi-terminal direct-current power transmission system Download PDFInfo
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
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- 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 relates to a method, a device, computer equipment, a storage medium and a computer program product for sequential locking of double valve banks of a multi-terminal direct-current power transmission system. The method comprises the steps of judging whether a fault converter station is a unique transmitting end converter station or a unique receiving end converter station when locking information of a first valve group of the fault converter station is monitored; if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station; determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running. By adopting the method, the operation stability and the power transmission flexibility of the multi-terminal direct-current power transmission system can be enhanced.
Description
Technical Field
The present application relates to the field of dc power transmission engineering technologies, and in particular, to a method, an apparatus, a computer device, a storage medium, and a computer program product for handling sequential double-valve-block locking in a multi-terminal dc power transmission system.
Background
With the development of the ultra-high voltage direct current transmission technology, the multi-terminal direct current transmission technology has the characteristics of strong transmission capability, long transmission distance and high flexibility and receives more and more attention. The control protection system is used as the brain of the multi-terminal direct current transmission network, is a necessary condition for maintaining stable and safe transportation of the extra-high voltage direct current network, and generally protects the extra-high voltage direct current system in a protection locking mode.
At present, when a certain valve group (a high-end valve group or a low-end valve group) of a certain pole (pole 1 or pole 2) of a certain converter station is locked, a control protection system can lock one valve group of the same pole of all the other converter stations together, and if another valve group of the local pole of the converter station is locked again, another valve group of the same pole of all the other converter stations is correspondingly locked, so that the direct-current power transmission of the local pole is interrupted, and the safe and stable operation of a power transmission system is seriously influenced.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, a storage medium, and a computer program product for handling sequential locking of dual valve banks in a multi-terminal dc transmission system, which can guarantee transmission power of the dc transmission system and stabilize operation of a power grid.
In a first aspect, the present application provides a method for handling double-valve-group sequential locking of a multi-terminal direct-current power transmission system, where the method includes:
when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station;
if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station;
determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve group of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault pole in all the other converter stations to keep running.
In one embodiment, after the determining whether the faulty converter station is the only sending-end converter station or the only receiving-end converter station, the method further includes:
if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the only station; wherein the executing the unique station-to-single valve group lockout strategy comprises: and controlling one valve bank in the double valve banks of the fault pole in all the converter stations to be locked, and matching the other valve bank with the fault pole to realize zero current control.
In one embodiment, after the executing the single station-to-single valve group locking strategy, the method further includes:
and determining and monitoring locking information of a second valve group of the fault pole in the fault converter station, and controlling double valve group locking of the fault pole in all converter stations.
In one embodiment, the executing the single valve group lockout strategy for the fault converter station includes:
controlling the locking of a first valve group of a fault pole in the fault converter station, and matching the other valve group with the fault pole to realize zero current control;
the double-valve group controlling the fault pole in all the other converter stations is matched with the fault pole current control to be zero.
In one embodiment, after the determining whether the lockout information of the second valve group of the faulty pole in the faulty converter station is monitored within the preset time, the method further includes:
and if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault pole in all the other converter stations to complete the current control zero of the fault pole, and controlling one valve group in the double valve groups of the fault pole in all the other converter stations to be locked.
In one embodiment, after the lockout of one of the double valve packs for controlling the faulty pole in the faulty converter station in all the remaining converter stations, the method further includes:
and if the preset time is exceeded, monitoring locking information of a second valve bank of a fault pole in the fault converter station, and controlling the fault poles in all the other converter stations to keep the single valve banks to operate.
In a second aspect, the application further provides a double-valve-set sequential locking handling device for the multi-terminal direct-current power transmission system. The device comprises:
the information judgment module is used for judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station when the locking information of the first valve group of the fault converter station is monitored;
the single valve group locking module is used for executing a single valve group locking strategy of the fault converter station if the fault converter station is not the only transmitting end converter station or the only receiving end converter station;
the information monitoring module is used for determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and the sequential locking module is used for controlling the double valve group of the fault pole in the fault converter station to be locked and controlling the double valve group of the fault pole in all the other converter stations to keep running if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:
when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station;
if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station;
determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve group of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault pole in all the other converter stations to keep running.
In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station;
if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station;
determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve group of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault pole in all the other converter stations to keep running.
In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:
when locking information of a first valve group of a fault converter station is determined to be monitored, judging whether the fault converter station is an only transmitting end converter station or an only receiving end converter station;
if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station;
determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve group of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault pole in all the other converter stations to keep running.
After the blocking information of the first valve group of the fault converter station is determined to be monitored, different single valve group blocking strategies are executed according to whether the fault converter station is the only sending end converter station or the only receiving end converter station, whether the blocking information of the second valve group of the fault converter station is monitored is further judged, and different double valve group successive blocking strategies are executed according to whether the fault converter station is the only sending end converter station or the only receiving end converter station. Therefore, the locked valve groups are determined in a targeted mode according to different working conditions, the valve groups of all converter stations cannot be directly controlled to be completely locked without different working conditions, and particularly when the double valve groups of the non-unique transmitting-end converter station and the unique receiving-end converter station are locked successively, only the station is reversed, and all the other converter stations are kept running continuously. Therefore, the power transmission flexibility of the multi-terminal direct-current power transmission system is enhanced, the power transmission of the direct-current power transmission system is guaranteed, and the safe and stable operation of the power transmission system is improved. In addition, the invention utilizes the control protection system of the multi-terminal direct current transmission system, improves the original double-valve-group locking strategy, does not increase hardware equipment, can effectively avoid resource consumption and increase communication burden in the station, and greatly saves economic cost.
Drawings
Fig. 1 is an application environment diagram of a double-valve-bank sequential locking handling method of a multi-terminal dc power transmission system in an embodiment;
fig. 2 is a schematic flow chart illustrating a sequential double valve block locking handling method for a multi-terminal dc power transmission system according to an embodiment;
fig. 3 is a schematic structural diagram of a multi-terminal dc transmission system;
fig. 4 is a schematic flow chart illustrating a sequential dual valve block lockout handling method for a multi-terminal dc power transmission system according to another embodiment;
fig. 5 is a schematic flow chart illustrating a sequential double valve block lockout handling method for a multi-terminal dc power transmission system according to yet another embodiment;
FIG. 6 is a logic flow diagram of a method for handling sequential double block lockout in a multi-terminal DC power transmission system according to an embodiment;
fig. 7 is a block diagram of a double valve set sequential lock handling device of a multi-terminal dc power transmission system in one embodiment;
FIG. 8 is a diagram of an internal structure of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The double-valve-group sequential locking disposal method for the multi-terminal direct-current power transmission system can be applied to a control protection system of the multi-terminal direct-current power transmission system. The control protection system is used for completing start-stop control of the direct current transmission system; controlling the size and direction of the direct current transmission power; inhibiting abnormal operation of a current converter and interference on a connected alternating current system; protecting converter station equipment when a fault occurs; monitoring various operating parameters of the converter station, the dc lines (such as voltage and current, etc.) and information of the control system itself, etc. Specifically, the two-valve-group sequential locking handling method of the multi-terminal dc transmission system can be applied to the application environment shown in fig. 1. The control protection system comprises a terminal 102 and a server 104, wherein the terminal 102 communicates with the server 104 through a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be placed on the cloud or other network server. When determining that the locking information of the first valve group of the fault converter station is monitored, the server 104 judges whether the fault converter station is the only transmitting-end converter station or the only receiving-end converter station; if the fault converter station is not the only transmitting end converter station and the only receiving end converter station, executing a single valve group locking strategy of the fault converter station; determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station; and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running. The terminal 102 may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and internet of things devices. The server 104 may be implemented as a stand-alone server or a server cluster comprised of multiple servers. For example, when the server 104 includes a server a and a server B, the server a monitors various operation parameters of the converter stations and the dc lines and information of the control system itself, and generates lock information of each valve group in all the converter stations, and the server B performs lock handling according to the received lock information, and performs fault detection and lock control using the two servers, respectively. The server 104 may be an independent server, and the failure detection, the lock information generation, and the lock processing may be performed simultaneously by the same server.
In one embodiment, as shown in fig. 2, a method for handling sequential lock of a double valve group of a multi-terminal dc power transmission system is provided, which is exemplified by the application of the method to the server 104 in fig. 1, and includes the following steps:
step 100, when locking information of a first valve group of a fault converter station is determined to be monitored, whether the fault converter station is the only transmitting end converter station or the only receiving end converter station is judged.
The ultrahigh-voltage multi-terminal direct-current transmission system comprises three or more Converter stations and can realize multi-point power transmission and multi-point power receiving, wherein a transmitting end comprises h Converter stations, a receiving end comprises i Converter stations, h is more than or equal to 1, i is more than or equal to 1, h + i is more than or equal to 3, and each Converter station can be a conventional direct-current LCC (Line-commutated Converter) Converter station or a flexible direct-current VSC (voltage source Converter) Converter station. As shown in fig. 3, taking a three-terminal dc transmission system as an example, the system includes a converter station a, a converter station B, and a converter station C, where the converter station a is a unique sending-end converter station, the converter station B and the converter station C are non-unique receiving-end converter stations, and poles 1 and 2 of the converter station a, the converter station B, and the converter station C respectively include a high-voltage valve group and a low-voltage valve group.
And step 200, if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station.
When the fault converter station is not the only transmitting end converter station or the only receiving end converter station, the extra-high voltage multi-end direct current transmission system can be kept to operate stably by controlling the fault converter station to execute the pole withdrawing restart and controlling all the other converter stations to operate normally. And the other converter stations specifically refer to all other converter stations except the fault converter station in the extra-high voltage multi-terminal direct current transmission system. Based on this, the strategy for the single valve group fault lockout is different according to whether the fault converter station is the only sending end converter station or the only receiving end converter station.
In one embodiment, a single valve group locking strategy of a fault converter station is implemented, which comprises the following steps: controlling the locking of a first valve bank of a fault pole in the fault converter station, and matching the current control of the fault pole with zero of the other valve bank; the double-valve groups controlling the faulted poles in all the remaining converter stations are combined with a faulted pole current control of zero.
The fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station. It can be understood that, when determining the blocking information of the first valve group of the faulty converter station, the blocking information includes which converter station, which pole, and which valve group in the multi-terminal dc transmission system the faulty converter station is specifically, for example, the blocking information of the first valve group of the faulty converter station is the blocking of the high-voltage valve group of the pole 1 in the converter station a, and correspondingly, the faulty converter station is the converter station a, the faulty pole is the pole 1, the first valve group is the high-voltage valve group, the low-voltage valve group is matched with the pole 1, and the high-voltage valve group and the low-voltage valve group of the pole 1 in all the other converter stations are matched with the pole 1, i.e., zero.
The step of matching with the current control zero of the fault pole is different according to the types of the converter stations, and when the converter stations are conventional direct current LCC stations, the corresponding valve group of the fault pole is matched with a forced phase shift; when the converter station is a flexible direct current VSC station, the valve group corresponding to the fault pole is matched with zero voltage control, so that the current of the fault pole is controlled to be zero, and the pole of the fault converter station can be conveniently withdrawn.
And step 300, determining whether the locking information of the second valve group of the fault pole in the fault converter station is monitored in the preset time.
The preset time may be preset in the server, or may be input to the server through a terminal by an operator according to an actual situation, for example, a dc operation control interface is provided on the terminal, and the operator may set the preset time on the dc operation control interface. The preset time needs to be set to 20ms, 30ms and the like according to actual conditions, for example, specifically set according to the time difference between two valve group locking messages monitored by the server due to the difference of the two valve group action characteristics. For convenience of understanding, the server 104 includes a server a and a server B for example, in a condition that the double valve sets are successively locked in the faulty converter station, the server a generates and sends out double valve set successive locking information of the faulty converter station, and the server B receives the two locking information successively instead of receiving the two locking information simultaneously, and sets a preset time according to a possible interval time when the server B receives the two locking information.
And step 400, if the locking information of the second valve group of the fault pole in the fault converter station is obtained within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running.
Specifically, if the blocking information of the second valve group of the fault pole in the fault converter station is acquired within the preset time, the command can be determined as a sequential blocking command of the fault pole double valve groups, the command can be further converted into a pole withdrawing command Y _ EOSF, the double valve group of the fault pole in the fault converter station is blocked, all the other converter stations immediately reset the blocking command of the first valve group of the fault converter station which is started to be received after receiving the Y _ EOSF command, and the pole withdrawing restart logic is executed in cooperation with the fault converter station, and then the double valve groups continue to operate. Therefore, the fault converter station is isolated, the power failure range is reduced, the transmission power loss is reduced, and the stable operation of a power grid is facilitated.
According to the method for handling successive locking of the double valve groups of the multi-terminal direct current transmission system, after locking information of a first valve group of a fault converter station is determined and monitored, different single valve group locking strategies are executed according to whether the fault converter station is the only transmitting end converter station or the only receiving end converter station, whether locking information of a second valve group of a fault pole in the fault converter station is monitored is further judged, and different successive locking strategies of the double valve groups are executed again according to whether the fault converter station is the only transmitting end converter station or the only receiving end converter station. Therefore, the locked valve groups are determined according to different working conditions, the valve groups of all converter stations cannot be directly controlled to be completely locked without different working conditions, and particularly, when the double valve groups of the non-unique transmitting-end converter station or the unique receiving-end converter station are locked successively, only the station is reversed, and all the other converter stations keep running continuously. Therefore, the power transmission flexibility of the multi-terminal direct-current power transmission system is enhanced, the power transmission of the direct-current power transmission system is guaranteed, and the safe and stable operation of the power transmission system is improved. In addition, the invention utilizes the control protection system of the multi-terminal direct current transmission system, improves the original double-valve-group locking strategy, does not increase hardware equipment, can effectively avoid resource consumption and increase communication burden in the station, and greatly saves economic cost.
In one embodiment, as shown in fig. 4, after step 100, the method further comprises:
and step 210, if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a locking strategy of the only station single valve group. Wherein, the only station single valve group locking strategy of execution includes: and one valve bank in the double valve banks of the fault pole in all the converter stations is controlled to be locked, and the other valve bank is matched with the fault pole to realize zero current control.
It can be understood that, when the faulty converter station is the only sending-end converter station or the only receiving-end converter station, the corresponding valve group locking of the faulty pole of the faulty converter station will cause the transmission power of the faulty pole to decrease, and all the other converter stations need to correspondingly lock any one valve group, while the other valve group cooperates with the faulty pole to control zero, thereby improving the stability of the system operation.
In one embodiment, as shown in fig. 4, after step 210, the method further comprises:
and 310, determining that the locking information of the second valve group of the fault pole in the fault converter station is monitored, and controlling the double-valve group locking of the fault pole in all converter stations.
When the second valve group locking information of the fault pole in the fault converter station is monitored, the command can be determined as a fault pole double valve group sequential locking command, the command can be further converted into a pole locking command X _ ESOF, and all the double valve groups of the fault pole in the converter station immediately execute pole locking. Therefore, for the working condition that the double valve sets of the only transmitting end converter station or the only receiving end converter station are locked successively, all the poles of the converter stations execute pole locking so as to ensure the safety of a direct current transmission system.
In one embodiment, as shown in fig. 5, after step 300, the method further comprises:
and step 410, if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault poles in all the other converter stations to finish the current control of the fault pole to be zero, and controlling the other valve groups in the double valve groups of the fault poles in all the other converter stations to be locked.
In this embodiment, since the second valve group locking information of the faulty converter station is not monitored within the preset time, it is not considered to be sequential locking, and in order to ensure the operation stability of the multi-terminal dc transmission system, another valve group in the double valve groups of the faulty pole in all the other converter stations needs to be correspondingly controlled to be locked. Specifically, a pole withdrawal instruction Y _ EOSF can be generated according to the second valve group locking information, and after all the other converter stations receive the Y _ EOSF instruction, the double valve groups are matched with a fault pole current control zero, so that the operation of the single valve group is kept, and the operation safety of the system is guaranteed.
In one embodiment, as shown in fig. 5, after step 410, the method further comprises step 510: and if the locking information of the second valve bank of the fault pole in the fault converter station is monitored after the preset time is exceeded, controlling the fault poles in all the other converter stations to keep the single valve bank to operate.
In this embodiment, the condition that the double valve groups are sequentially locked and the working condition is considered to be non-sequential locking is that the second valve group locking information of the fault pole is monitored again, so that when the double valve groups of the fault pole in the fault converter station are all locked, the fault converter station can be controlled to retreat from the pole in time, and the fault poles in all the other converter stations keep the single valve group running. Specifically, a pole withdrawal instruction Y _ EOSF is generated according to the second valve group locking information, after all the other converter stations receive the pole withdrawal instruction Y _ EOSF and cooperate with the fault converter station to execute a pole withdrawal restarting logic, the single pole valve group continues to operate, and therefore the purpose of guaranteeing the operation stability of the multi-terminal direct current transmission system is achieved.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. As shown in fig. 6, the method for handling the double-valve-group sequential locking of the multi-terminal dc power transmission system includes the following steps:
(1) Setting a corresponding fault pole double-valve group successive locking time interval, namely a preset time delta T _ set;
(2) And under the condition that the communication between the converter stations is normal, the first valve bank of the fault pole in the fault converter station is locked, and the valve bank can be any one of the high-end valve bank and the low-end valve bank of the fault pole. Firstly, judging whether a fault converter station subjected to valve group locking is the only sending end converter station or the only receiving end converter station, if so, immediately locking one valve group for all the converter stations, matching forced phase shifting for the other valve group for the conventional direct current LCC station, and matching zero voltage control for the other valve group for the flexible direct current VSC station.
If the current station is not the only sending end converter station or the only receiving end converter station, the valve group of the fault pole of the fault converter station immediately performs locking, if the fault converter station is a conventional direct current LCC station, the other valve group of the pole is matched with forced phase shifting, and if the fault converter station is a flexible direct current VSC station, the other valve group of the pole is matched with zero voltage control. After all other converter stations in the direct current transmission system receive a valve group locking instruction of a fault converter station, a local double valve group of a conventional direct current LCC station is firstly matched with a forced phase shift delta T _ set, and a local double valve group of a flexible direct current VSC station is firstly matched with a zero control voltage delta T _ set.
(3) And a second valve bank of a certain pole of a certain station also sends a locking instruction in the delta T _ set after the locking instruction of the first valve bank is effective, firstly, whether the station is a non-unique transmitting-end converter station or a receiving-end converter station is judged, if the station is the unique transmitting-end converter station or the receiving-end converter station, the locking instruction of the second valve bank of the certain pole is converted into a pole locking instruction X _ ESOF, and all converter stations execute pole locking at once. If the current station is not the only sending end converter station or receiving end converter station, the successive blocking instruction of the local double valve group is converted into a pole-withdrawing instruction Y _ EOSF to block the local double valve group, all the other converter stations immediately reset the first valve group blocking instruction of the failed converter station after receiving the Y _ EOSF instruction sent by the failed converter station, and the local double valve group continues to operate after the pole-withdrawing restart logic is executed in cooperation with the failed converter station.
(3) And if all other converter stations do not receive a pole withdrawing instruction Y _ EOSF converted from the fault pole double-valve group sequential locking instruction of the fault converter station within the time delta T _ set, wherein the conventional direct current LCC station local pole double-valve group completes forced phase shift delta T _ set, and after the flexible direct current VSC station local pole double-valve group completes zero control voltage delta T _ set, one valve group of the local pole is locked.
(4) And a second valve group of a fault pole of the fault converter station also sends a locking instruction outside the delta T _ set after the locking instruction of the first valve group is effective, firstly, whether the fault converter station is a non-unique transmitting end converter station or a receiving end converter station is judged, if the fault converter station is the unique transmitting end converter station or the receiving end converter station, the locking instruction of the second valve group of the fault pole is converted into a pole locking instruction X _ ESOF, and all poles of the converter stations immediately execute pole locking. If the current station is not the only sending end converter station or receiving end converter station, the second valve group locking instruction of the current station is converted into a pole withdrawing instruction Y _ EOSF to lock the current station of the current station, and all other converter stations cooperate with the fault converter station to execute a pole withdrawing restart logic after receiving the pole withdrawing instruction Y _ EOSF sent by the fault converter station, and then the single-pole valve group of the current station keeps running continuously.
In the embodiment, the two-valve-group sequential locking processing method of the multi-terminal direct-current power transmission system determines the locked valve groups in a targeted manner according to different working conditions, so that the power transmission flexibility of the multi-terminal direct-current power transmission system is enhanced, the power transmission of the direct-current power transmission system is ensured, and the safe and stable operation of the power transmission system is improved.
It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.
Based on the same inventive concept, the embodiment of the application also provides a double-valve-group sequential locking processing device for the multi-terminal direct-current power transmission system, which is used for realizing the double-valve-group sequential locking processing method for the multi-terminal direct-current power transmission system. The implementation scheme for solving the problem provided by the apparatus is similar to the implementation scheme described in the method, so specific limitations in the following one or more embodiments of the double-valve-block sequential locking handling apparatus for the multi-terminal dc power transmission system may refer to the limitations on the double-valve-block sequential locking handling method for the multi-terminal dc power transmission system, and are not described herein again.
In one embodiment, as shown in fig. 7, there is provided a two-valve set sequential latch handling device for a multi-terminal dc power transmission system, comprising: information decision module 10, single valve group lockout module 20, information monitoring module 30 and sequential lockout module 40, wherein:
the information determining module 10 is configured to determine, when locking information of a first valve group of a faulty converter station is monitored, whether the faulty converter station is an only transmitting-end converter station or an only receiving-end converter station;
the single valve group locking module 20 is configured to execute a single valve group locking strategy of the faulty converter station if the faulty converter station is not the only sending-end converter station or the only receiving-end converter station;
the information monitoring module 30 is configured to determine whether locking information of a second valve group of a fault pole in the fault converter station is monitored within a preset time; the fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station;
and the sequential locking module 40 is used for controlling the double valve group of the fault pole in the fault converter station to be locked and controlling the double valve group of the fault pole in all the other converter stations to keep running if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time.
According to the double-valve-group sequential locking disposal device for the multi-terminal direct-current transmission system, the locked valve groups are determined in a targeted manner according to different working conditions, all the valve groups of all converter stations cannot be directly controlled to be locked under different working conditions, and particularly when the double-valve-group sequential locking of a non-unique transmitting-end converter station or a unique receiving-end converter station is performed, only the station is reversed, and all the other converter stations are kept to continuously operate. Therefore, the power transmission flexibility of the multi-terminal direct-current power transmission system is enhanced, the power transmission of the direct-current power transmission system is guaranteed, and the safe and stable operation of the power transmission system is improved.
In one embodiment, the single valve group lockout module 20 is configured to execute a unique station single valve group lockout strategy if the faulty converter station is the only transmitting converter station or the only receiving converter station; wherein, carry out only station individual valves locking tactics, include: and one valve group in the double valve groups of the fault poles in all the converter stations is controlled to be locked, and the other valve group is matched with the fault pole to realize zero current control.
In one embodiment, the sequential lockout module 40 is configured to determine that lockout information for the second valve set of the failed pole in the failed converter station is monitored, and control double valve set lockout for the failed pole in all converter stations.
In one embodiment, the single valve group locking module 20 is used for controlling the locking of a first valve group of a fault pole in the fault converter station, and the current control of the other valve group is zero in cooperation with the fault pole; the double-valve groups controlling the faulted poles in all the remaining converter stations are combined with a faulted pole current control of zero.
In one embodiment, the sequential locking module 40 is configured to, if the locking information of the second valve group of the faulty pole in the faulty converter station is not monitored within the preset time, control the double valve groups of the faulty pole in all the remaining converter stations to complete current control of the faulty pole to zero, and control one valve group in the double valve groups of the faulty pole in all the remaining converter stations to lock.
In one embodiment, the sequential locking module 40 is configured to, if the locking information of the second valve group of the faulty pole in the faulty converter station is monitored after the preset time is exceeded, control the faulty poles in all the remaining converter stations to keep the single valve group operating.
All or part of each module in the double-valve-group sequential locking treatment device of the multi-terminal direct-current power transmission system can be realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 8. The computer device comprises a processor, a memory, an Input/Output (I/O) interface and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer equipment is used for storing related data of a double-valve-group sequential locking disposal method of the multi-terminal direct-current power transmission system. The input/output interface of the computer device is used for exchanging information between the processor and an external device. The communication interface of the computer device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a method for handling sequential locking of dual valve blocks of a multi-terminal DC power transmission system.
It will be appreciated by those skilled in the art that the configuration shown in fig. 8 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program: when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station; if the fault converter station is not the only transmitting end converter station and the only receiving end converter station, executing a single valve group locking strategy of the fault converter station; determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station; and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running.
In one embodiment, the processor when executing the computer program further performs the steps of: if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the only station; wherein, carry out only station individual valves locking tactics, include: and one valve bank in the double valve banks of the fault pole in all the converter stations is controlled to be locked, and the other valve bank is matched with the fault pole to realize zero current control.
In one embodiment, the processor when executing the computer program further performs the steps of: and determining and monitoring the locking information of the second valve group of the fault pole in the fault converter station, and controlling the double valve group locking of the fault pole in all the converter stations.
In one embodiment, the processor, when executing the computer program, further performs the steps of: controlling the locking of a first valve bank of a fault pole in the fault converter station, and matching the current control of the fault pole with zero of the other valve bank; the double-valve groups controlling the faulted poles in all the remaining converter stations are combined with a faulted pole current control of zero.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault poles in all the other converter stations to complete the current control zero of the fault pole, and controlling one valve group in the double valve groups of the fault poles in all the other converter stations to be locked.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and if the locking information of the second valve bank of the fault pole in the fault converter station is monitored after the preset time is exceeded, controlling the fault poles in all the other converter stations to keep the single valve bank to operate.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station; if the fault converter station is not the only transmitting end converter station and the only receiving end converter station, executing a single valve group locking strategy of the fault converter station; determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station; and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running.
In one embodiment, the computer program when executed by the processor further performs the steps of: if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the only station; wherein, the only station single valve group locking strategy of execution includes: and one valve bank in the double valve banks of the fault pole in all the converter stations is controlled to be locked, and the other valve bank is matched with the fault pole to realize zero current control.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining and monitoring the locking information of the second valve group of the fault pole in the fault converter station, and controlling the double valve group locking of the fault pole in all the converter stations.
In one embodiment, the computer program when executed by the processor further performs the steps of: controlling the locking of a first valve bank of a fault pole in the fault converter station, and matching the current control of the fault pole with zero of the other valve bank;
the double-valve groups controlling the faulted poles in all the remaining converter stations are combined with a faulted pole current control of zero.
In one embodiment, the computer program when executed by the processor further performs the steps of: and if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault poles in all the other converter stations to complete the current control zero of the fault pole, and controlling one valve group in the double valve groups of the fault poles in all the other converter stations to be locked.
In one embodiment, the computer program when executed by the processor further performs the steps of: and if the locking information of the second valve bank of the fault pole in the fault converter station is monitored after the preset time is exceeded, controlling the fault poles in all the other converter stations to keep the single valve bank to operate.
In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, performs the steps of: when locking information of a first valve group of a fault converter station is monitored, judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station; if the fault converter station is not the only transmitting end converter station and the only receiving end converter station, executing a single valve group locking strategy of the fault converter station; determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault electrode is the electrode of the valve group corresponding to the locking information of the first valve group of the fault converter station; and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve groups of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault poles in all the other converter stations to keep running.
In one embodiment, the computer program when executed by the processor further performs the steps of: if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the only station; wherein, the only station single valve group locking strategy of execution includes: and one valve bank in the double valve banks of the fault pole in all the converter stations is controlled to be locked, and the other valve bank is matched with the fault pole to realize zero current control.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining and monitoring the locking information of the second valve group of the fault pole in the fault converter station, and controlling the double valve group locking of the fault pole in all the converter stations.
In one embodiment, the computer program when executed by the processor further performs the steps of: controlling the locking of a first valve bank of a fault pole in the fault converter station, and matching the current control of the fault pole with zero of the other valve bank; the double-valve group controlling the fault pole in all the other converter stations is matched with the fault pole current control to be zero.
In one embodiment, the computer program when executed by the processor further performs the steps of: and if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault poles in all the other converter stations to complete the current control zero of the fault pole, and controlling one valve group in the double valve groups of the fault poles in all the other converter stations to be locked.
In one embodiment, the computer program when executed by the processor further performs the steps of: and if the locking information of the second valve bank of the fault pole in the fault converter station is monitored after the preset time is exceeded, controlling the fault poles in all the other converter stations to keep the single valve bank to operate.
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 hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A method for handling double-valve-block sequential locking of a multi-terminal direct-current power transmission system, the method comprising:
when locking information of a first valve group of a fault converter station is determined to be monitored, judging whether the fault converter station is an only transmitting end converter station or an only receiving end converter station;
if the fault converter station is not the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the fault converter station;
determining whether locking information of a second valve group of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time, controlling the double valve group of the fault pole in the fault converter station to be locked, and controlling the double valve groups of the fault pole in all the other converter stations to keep running.
2. The method according to claim 1, wherein after the determining whether the faulty converter station is the only transmitting end converter station or the only receiving end converter station, further comprising:
if the fault converter station is the only transmitting end converter station or the only receiving end converter station, executing a single valve group locking strategy of the only station; wherein the executing the unique station-to-single valve group lockout strategy comprises: and controlling one valve bank in the double valve banks of the fault pole in all the converter stations to be locked, and matching the other valve bank with the fault pole to realize zero current control.
3. The method of claim 2, wherein after performing the unique station-to-valve block lockout strategy, further comprising:
and determining and monitoring locking information of a second valve group of the fault pole in the fault converter station, and controlling double valve group locking of the fault pole in all converter stations.
4. The method according to claim 1, wherein the performing the faulted converter station single valve block lockout strategy comprises:
controlling the locking of a first valve group of a fault pole in the fault converter station, and matching the other valve group with the fault pole to realize zero current control;
the double-valve groups controlling said faulted pole in all the remaining converter stations combine said faulted pole current control with zero.
5. The method according to claim 1, wherein after said determining whether lockout information of a second valve group of a faulty pole in said faulty converter station is monitored within a preset time, further comprising:
and if the locking information of the second valve group of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve groups of the fault pole in all the other converter stations to complete the current control zero of the fault pole, and controlling one valve group in the double valve groups of the fault pole in all the other converter stations to be locked.
6. The method according to claim 5, wherein said controlling all remaining converter stations after lockout of one of said double valve packs for said faulted pole in said faulted converter station further comprises:
and if the preset time is exceeded, monitoring the locking information of the second valve bank of the fault pole in the fault converter station, and controlling the fault poles in all the other converter stations to keep the single valve banks to operate.
7. A double block sequential latch handling apparatus for a multi-terminal dc transmission system, the apparatus comprising:
the information judgment module is used for judging whether the fault converter station is the only transmitting end converter station or the only receiving end converter station when the locking information of the first valve group of the fault converter station is monitored;
the single valve group locking module is used for executing a single valve group locking strategy of the fault converter station if the fault converter station is not the only transmitting end converter station or the only receiving end converter station;
the information monitoring module is used for determining whether locking information of a second valve bank of a fault pole in the fault converter station is monitored within preset time; the fault pole is a pole of a valve group corresponding to the locking information of the first valve group of the fault converter station;
and the sequential locking module is used for controlling the double valve group of the fault pole in the fault converter station to be locked and controlling the double valve group of the fault pole in all the other converter stations to keep running if the locking information of the second valve group of the fault pole in the fault converter station is determined and monitored within the preset time.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 6 when executing the computer program.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 6 when executed by a processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211143245.0A CN115333098B (en) | 2022-09-20 | Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211143245.0A CN115333098B (en) | 2022-09-20 | Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system |
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| CN115333098A true CN115333098A (en) | 2022-11-11 |
| CN115333098B CN115333098B (en) | 2024-05-31 |
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