CN115333098B - Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system - Google Patents
Method, device and equipment for handling double valve group sequential locking of multi-terminal direct current transmission system Download PDFInfo
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- CN115333098B CN115333098B CN202211143245.0A CN202211143245A CN115333098B CN 115333098 B CN115333098 B CN 115333098B CN 202211143245 A CN202211143245 A CN 202211143245A CN 115333098 B CN115333098 B CN 115333098B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The application relates to a method, a device, computer equipment, a storage medium and a computer program product for handling double valve bank sequential locking of a multi-terminal direct current transmission system. Determining whether the fault current converter station is the only current-transmitting end current converter station or the only current-receiving end current converter station when the locking information of the first valve group of the fault current converter station is detected; if the fault converter station is not the only sending 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; and if the locking information of the second valve bank of the fault pole in the fault current converter station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current converter station to be locked, and controlling the double valve banks of the fault pole in all other current converter stations to keep running. The method can enhance the operation stability and the power transmission flexibility of the multi-terminal direct current power transmission system.
Description
Technical Field
The application relates to the technical field of direct current transmission engineering, in particular to a method, a device, computer equipment, a storage medium and a computer program product for handling double valve bank sequential locking of a multi-terminal direct current transmission system.
Background
With the development of the extra-high voltage direct current transmission technology, the multi-terminal direct current transmission technology has the characteristics of strong transmission capacity, long transmission distance and high flexibility and is receiving more and more attention. The control protection system is used as the brain of the multi-terminal direct current power transmission network, is a necessary condition for maintaining the 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 bank (a high-end valve bank or a low-end valve bank) of a certain pole (pole 1 or pole 2) of a certain converter station is locked, one valve bank of the same poles of all other converter stations is also locked together, and if the other valve bank of the current pole of the converter station is locked again, the other valve bank of the same poles of all other converter stations is correspondingly locked, so that the direct current power transmission of the current pole is interrupted, and the safe and stable operation of the power transmission system is seriously influenced.
Disclosure of Invention
Based on the foregoing, it is necessary to provide a multi-end direct current transmission system double valve bank sequential locking treatment method, device, computer equipment, storage medium and computer program product capable of guaranteeing transmission power of the direct current transmission system and stabilizing operation of a power grid.
In a first aspect, the present application provides a dual valve block sequential locking handling method for a multi-terminal direct current power transmission system, the method comprising:
when the locking information of a first valve group of the fault converter station is determined to be 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 converter station and the only receiving 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 the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
And if the locking information of the second valve bank of the fault pole in the fault current conversion station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current conversion station to be locked, and controlling the double valve banks of the fault pole in all other current conversion stations to keep running.
In one embodiment, after the determining whether the failed converter station is the only sender converter station or the only receiver converter station, the method further includes:
If the fault converter station is the only transmitting converter station or the only receiving converter station, executing a single station valve group locking strategy; wherein said executing a unique station single valve set latching strategy comprises: and locking one valve bank in the double valve banks for controlling the fault poles in all the converter stations, and matching the other valve bank with the fault pole to realize current control zero.
In one embodiment, after the unique station single valve group locking strategy is executed, the method further comprises:
And determining locking information of a second valve bank of the fault pole in the fault converter station, and controlling double valve banks of the fault poles in all the converter stations to be locked.
In one embodiment, the performing a faulty converter station single valve block latching strategy includes:
controlling a first valve bank of a fault pole in the fault current converting station to be locked, and matching the other valve bank with the fault pole to control zero;
and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current to control zero.
In one embodiment, after determining whether the blocking information of the second valve group of the fault pole in the faulty converter station is monitored within a preset time, the method further includes:
And if the locking information of the second valve bank of the fault pole in the fault current converting station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other current converting stations to complete the current control zero of the fault pole, and controlling one valve bank in the double valve banks of the fault pole in all other current converting stations to be locked.
In one embodiment, after one of the double valve groups of the fault pole in the fault converter station is blocked, the method further includes:
and if the locking information of the second valve group of the fault pole in the fault current converter station is monitored after the preset time is exceeded, controlling all the fault poles in the rest current converter stations to keep the single valve group to operate.
In a second aspect, the application further provides a double-valve-group sequential locking treatment device of the multi-terminal direct current transmission system. The device comprises:
The information judging module is used for judging whether the fault current transformer station is the only current transformer station at the transmitting end or the only current transformer station at the receiving end when the locking information of the first valve group of the fault current transformer station is detected;
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 and the only receiving end converter station;
The information monitoring module is used for determining whether locking information of a second valve group of the fault pole in the fault current converter station is monitored in preset time; the fault pole is the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
And the sequential locking module is used for controlling the double valve groups of the fault pole in the fault current converter station to be locked and controlling the double valve groups of the fault pole in all other current converter stations to keep running if the locking information of the second valve group of the fault pole in the fault current converter station is determined to be 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 which when executing the computer program performs the steps of:
when the locking information of a first valve group of the fault converter station is determined to be 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 converter station and the only receiving 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 the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
And if the locking information of the second valve bank of the fault pole in the fault current conversion station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current conversion station to be locked, and controlling the double valve banks of the fault pole in all other current conversion stations to keep running.
In a fourth aspect, the present application also 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 the locking information of a first valve group of the fault converter station is determined to be 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 converter station and the only receiving 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 the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
And if the locking information of the second valve bank of the fault pole in the fault current conversion station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current conversion station to be locked, and controlling the double valve banks of the fault pole in all other current conversion stations to keep running.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
when the locking information of a first valve group of the fault converter station is determined to be 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 converter station and the only receiving 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 the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
And if the locking information of the second valve bank of the fault pole in the fault current conversion station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current conversion station to be locked, and controlling the double valve banks of the fault pole in all other current conversion stations to keep running.
The method, the device, the computer equipment, the storage medium and the computer program product for handling the sequential blocking of the double valve groups of the multi-terminal direct current power transmission system are characterized in that after determining that the blocking information of the first valve group of the fault current transformer station is monitored, different single valve group blocking strategies are executed according to whether the fault current transformer station is the only transmitting current transformer station or the only receiving current transformer station, whether the blocking information of the second valve group of the fault current transformer station is monitored is further judged, and different double valve group sequential blocking strategies are executed again according to whether the fault current transformer station is the only transmitting current transformer station or the only receiving current transformer station. The closed valve groups are determined specifically according to different working conditions, all valve groups of all converter stations are not directly controlled to be closed without dividing 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 closed in sequence, only the station is in a pole-reversing state, and all 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 ensured, 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 a station, and greatly saves economic cost.
Drawings
Fig. 1 is an application environment diagram of a dual valve block sequential lockout handling method for a multi-port dc power transmission system in one embodiment;
FIG. 2 is a flow chart of a dual valve block sequential lockout handling method for a multi-port DC power transmission system in one embodiment;
Fig. 3 is a schematic structural diagram of a multi-terminal dc power transmission system;
Fig. 4 is a flow chart of a dual valve block sequential locking handling method of a multi-port dc power transmission system according to another embodiment;
Fig. 5 is a flow chart of a dual valve block sequential latch-up handling method for a multi-port dc power transmission system in yet another embodiment;
FIG. 6 is a logic flow diagram of a dual valve block sequential lockout handling method for a multi-port DC power transmission system in one embodiment;
FIG. 7 is a block diagram of a dual valve train sequential latch handling device of a multi-port DC power transmission system in accordance with one embodiment;
fig. 8 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The double-valve group sequential locking treatment method for the multi-terminal direct current transmission system provided by the embodiment of the application can be applied to a control protection system of the multi-terminal direct current 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 the converter and interference to an associated alternating current system; when a fault occurs, protecting converter station equipment; monitoring various operating parameters of the converter station, the direct current line (such as voltage and current) and the information of the control system itself. Specifically, the dual valve block sequential locking treatment method of the multi-terminal direct current transmission system can be applied to an application environment as 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 located on a cloud or other network server. When determining that the blocking 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 sending 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 is the valve bank pole corresponding to the locking information of the first valve bank of the fault converter station; and if the locking information of the second valve bank of the fault pole in the fault current converter station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current converter station to be locked, and controlling the double valve banks of the fault pole in all other current 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 as a server cluster of multiple servers. For example, when the server 104 includes the server a and the server B, the server a monitors various operation parameters of the converter station and the dc line and information of the control system itself, generates blocking information of each valve group in all the converter stations, and the server B performs blocking treatment according to the received blocking information, and performs fault detection and blocking control by using the two servers, respectively. In addition, the server 104 may be an independent server, and the fault detection, the latch information generation, and the latch handling may be performed simultaneously by the same server.
In one embodiment, as shown in fig. 2, a dual valve block sequential locking method of a multi-terminal direct current transmission system is provided, and the method is applied to the server 104 in fig. 1 for illustration, and includes the following steps:
Step 100, determining whether the fault converter station is the only transmitting converter station or the only receiving converter station when the locking information of the first valve group of the fault converter station is monitored.
The extra-high voltage multi-terminal direct current transmission system comprises three or more converter stations, and can realize multi-point power transmission and multi-point power reception, wherein the power transmission end comprises h converter stations, the power reception 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-commuted Converter, line converter) converter station or a flexible direct current VSC (ValtageSource Converter, voltage source converter) converter station. As shown in fig. 3, taking a three-terminal direct current 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 the only transmitting-end converter station, and the converter station B and the converter station C are non-only receiving-end converter stations, and poles 1 and 2 of the converter station a, the converter station B and the converter station C include a high-voltage valve group and a low-voltage valve group, respectively.
Step 200, if the failed converter station is not the only sender converter station and the only receiver converter station, executing a single valve block locking strategy of the failed converter station.
When the fault converter station is not the only transmitting-end converter station or the only receiving-end converter station, the fault converter station is controlled to execute the pole-returning restarting, and all other converter stations normally operate, so that the stable operation of the extra-high voltage multi-end direct current transmission system can be kept. All other converter stations specifically refer to all other converter stations except for the fault converter station in the extra-high voltage multi-end direct current transmission system. Based on this, the strategy after fault blocking for the single valve block will vary depending on whether the faulty converter station is the only sender converter station or the only receiver converter station.
In one embodiment, a failed converter station single valve block latching strategy is performed comprising: a first valve bank of a fault pole in the fault converter station is controlled to be locked, and the other valve bank is matched with the fault pole to be in current control zero; and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current control zero.
The fault is the valve bank position corresponding to the locking information of the first valve bank of the fault converter station. It will be appreciated that when determining the blocking information of the first valve bank of the faulty converter station, the blocking information includes which converter station, which pole and which valve bank of the multi-terminal dc power transmission system the faulty converter station is, for example, the blocking information of the first valve bank of the faulty converter station is the blocking of the high voltage valve bank of pole 1 in converter station a, and correspondingly, the faulty converter station is converter station a, the faulty pole 1 is the high voltage valve bank, the low voltage valve bank is matched with the current zero of pole 1, and the high voltage valve bank and the low voltage valve bank of pole 1 in all other converter stations are matched with the current zero of pole 1.
The step of matching fault pole current control zero is different according to the types of the converter stations, and when the converter stations are conventional direct current LCC stations, the fault pole corresponds to the valve group to match forced phase shifting; when the converter station is a flexible direct current VSC station, the fault corresponding valve group is matched with zero control voltage, so that the current of the fault pole is controlled to zero, and the fault converter station is convenient to return to the pole.
Step 300, determining whether the blocking information of the second valve group of the fault pole in the fault converter station is monitored within a preset time.
The preset time may be preset in the server, or may be input to the server by an operator according to actual conditions through a terminal, for example, the terminal is provided with a dc operation control interface, and the operator may set the preset time on the dc operation control interface. The preset time needs to be set to 20ms, 30ms, etc. according to practical situations, for example, the preset time is set specifically according to the time difference between two valve set locking information detected by the server caused by the difference of the action characteristics of the double valve sets. For ease of understanding, taking server 104 as an example, server a and server B are taken as an illustration, in a fault converter station, double valve bank sequential locking working conditions are taken, server a generates and sends double valve bank sequential locking information of the fault converter station, server B does not receive two locking information at the same time, but receives two locking information sequentially, and then preset time is set according to possible interval time of receiving the two locking information by server B.
Step 400, if the locking information of the second valve bank of the fault pole in the fault converter station is obtained within the preset time, controlling the double valve banks of the fault pole in the fault converter station to be locked, and controlling the double valve banks of the fault pole in all other converter stations to keep running.
Specifically, if the locking information of the second valve bank of the fault pole in the fault converter station is obtained within the preset time, the locking information can be determined to be a sequential locking instruction of the double valve banks of the fault pole, the instruction can be further converted into a pole-returning instruction Y_ EOSF, the double valve banks of the fault pole of the fault converter station are locked, all other converter stations immediately restore the locking instruction of the first valve bank of the fault converter station received after receiving the Y_ EOSF instruction, and meanwhile, after executing a pole-returning restarting logic in cooperation with the fault converter station, the double valve banks continue to operate. Therefore, the fault convertor station is isolated, the power outage range is reduced, the transmission power loss is reduced, and the stable operation of the power grid is facilitated.
According to the multi-end direct current transmission system double valve group sequential locking treatment method, after the locking information of the first valve group of the fault current transformer station is detected, different single valve group locking strategies are executed according to whether the fault current transformer station is the only transmitting current transformer station or the only receiving current transformer station, whether the locking information of the second valve group of the fault electrode in the fault current transformer station is detected is further judged, and different double valve group sequential locking strategies are executed again according to whether the fault current transformer station is the only transmitting current transformer station or the only receiving current transformer station. The closed valve groups are determined specifically according to different working conditions, all valve groups of all converter stations are not directly controlled to be closed without dividing working conditions, and particularly when a double valve group of a non-exclusive transmitting-end converter station or a single receiving-end converter station is closed in succession, only the station is in a pole-reversing state, and all 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 ensured, 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 a station, and greatly saves economic cost.
In one embodiment, as shown in fig. 4, after step 100, the method further comprises:
If the failed converter station is the only sender converter station or the only receiver converter station, a unique station single valve train latching strategy is performed, step 210. Wherein executing a unique standing single valve group latching strategy comprises: one valve bank of the double valve banks of the fault pole in all the converter stations is controlled to be blocked, and the other valve bank is matched with the fault pole to be in current control zero.
It can be appreciated that when the faulty converter station is the only sending converter station or the only receiving converter station, the blocking of the corresponding valve group of the faulty pole will cause the transmission power of the faulty pole to decrease, and all other converter stations need to block any valve group correspondingly, while the other valve group cooperates with the faulty pole to control zero current, thereby improving the stability of the system operation.
In one embodiment, as shown in FIG. 4, after step 210, the method further comprises:
step 310, determining the blocking information of the second valve group of the fault pole in the fault converter station, and controlling the blocking of the double valve groups of the fault poles in all the converter stations.
When the second valve bank locking information of the fault pole in the fault current converter station is monitored, the fault pole double valve bank sequential locking instruction can be determined, the instruction can be converted into a pole locking instruction X_ESOF, and the double valve banks of the fault pole in all the current converter stations immediately execute pole locking. Therefore, aiming at the working condition that the double valve groups of the only transmitting-end converter station or the only receiving-end converter station are blocked in succession, all the poles of the converter stations are blocked in a pole-blocking mode, so that the safety of a direct-current transmission system is ensured.
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 bank of the fault pole in the fault converter station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other converter stations to complete fault pole current control zero, and controlling the other valve bank in the double valve banks of the fault pole in all other converter stations to be locked.
In this embodiment, since the blocking information of the second valve group of the faulty converter station is not monitored within the preset time, the blocking is considered to be not sequential, and in order to ensure the operation stability of the multi-terminal dc power transmission system, the blocking of the other valve group of the double valve groups of the faulty poles in all the other faulty converter stations of the faulty converter station needs to be correspondingly controlled. Specifically, a pole-reversing instruction Y_ EOSF can be generated according to the locking information of the second valve bank, and after all other converter stations receive the Y_ EOSF instruction, the double valve banks cooperate with fault pole current control zero to keep the single valve bank to operate, so that the operation safety of the system is ensured.
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 all the fault poles in all the other converter stations to keep the single valve bank to operate.
The working condition considered in this embodiment is the non-sequential blocking, and the double valve sets are blocked in sequence, so that when the double valve sets of the fault pole in the fault converter station are blocked, the fault pole in the fault converter station can be controlled in time, and all other fault poles in the fault converter station keep the single valve set to operate. Specifically, a pole-reversing instruction Y_ EOSF is generated according to the locking information of the second valve bank, and after all other converter stations receive the pole-reversing instruction Y_ EOSF and cooperate with the fault converter station to execute pole-reversing restarting logic, the pole-single valve bank continues to operate, so that the purpose of ensuring the operation stability of the multi-terminal direct current transmission system is achieved.
For a better understanding of the above embodiments, the following detailed explanation is made in connection with a specific embodiment. As shown in fig. 6, the method for handling the sequential locking of the double valve groups of the multi-terminal direct current transmission system comprises the following steps:
(1) Setting a sequential locking time interval of a corresponding fault pole double valve group, namely a preset time delta T_set;
(2) Under normal conditions of communication among the converter stations, a first valve bank of a fault pole in the fault converter station is blocked, and the valve bank can be any one of a high-end valve bank and a low-end valve bank of the fault pole. Firstly judging whether a fault converter station with valve block locking is the only transmitting end converter station or the receiving end converter station, if the fault converter station is the only transmitting end converter station or the receiving end converter station, all the current poles of the current stations immediately execute the locking of one valve block, the other valve block of the current pole of the conventional direct current LCC station is matched with forced phase shifting, and the other valve block of the current pole of the flexible direct current VSC station is matched with zero control voltage.
If the current converter station is not the only current converter station at the transmitting end and the only current converter station at the receiving end, the valve group of the fault pole of the fault current converter station immediately executes locking, if the fault current converter station is a conventional direct current LCC station, the other valve group of the fault current converter station cooperates with forced phase shifting, and if the fault current converter station is a flexible direct current VSC station, the other valve group of the fault current converter station cooperates with zero control voltage. After all other converter stations in the direct current transmission system receive a fault converter station valve set locking instruction, the conventional direct current LCC station self-pole double valve set is matched with forced phase shifting delta T_set, and the flexible direct current VSC station self-pole double valve set is matched with 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 delta T_set after the locking instruction of the first valve bank is valid, firstly, whether the station is a non-exclusive sending end converter station or a receiving end converter station is judged, if the station is a exclusive sending end converter station or a receiving end converter station, the locking instruction of the second valve bank of the pole is converted into a pole locking instruction X_ESOF, and all poles of the converter stations immediately execute pole locking. If the current-collecting station is not the only current-collecting station or the current-collecting station, the sequential locking instruction of the current-collecting double valve group is converted into a pole-returning instruction Y_ EOSF to lock the current-collecting double valve group of the current-collecting station, all other current-collecting stations immediately restore the locking instruction of the first valve group of the current-collecting station after receiving the Y_ EOSF instruction sent by the current-collecting station, and meanwhile the current-collecting double valve group keeps running after executing pole-returning restarting logic in cooperation with the current-collecting station.
(3) And if all other converter stations do not receive the pole-returning instruction Y_ EOSF converted by the fault pole double valve group sequential locking instruction of the fault converter station within the time delta T_set, the conventional direct current LCC station pole double valve group finishes the forced phase shift delta T_set, and after the flexible direct current VSC station pole double valve group finishes the zero control voltage delta T_set, the pole double valve group is locked.
(4) And the second valve bank of the 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 bank is valid, 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 a unique transmitting-end converter station or a receiving-end converter station, the locking instruction of the second valve bank of the local pole is converted into a pole locking instruction X_ESOF, and all the poles of the converter station immediately execute pole locking. If the current transformer station is not the only current transformer station at the transmitting end or the current transformer station at the receiving end, the second valve set locking instruction of the current pole is converted into a current pole withdrawing instruction Y_ EOSF to lock the current pole of the current pole, and all other current transformer stations continue to operate after receiving the current pole withdrawing instruction Y_ EOSF sent by the fault current transformer station and executing a current pole withdrawing restarting logic by matching with the fault current transformer station.
In the embodiment, the double valve bank sequential locking treatment method of the multi-terminal direct current transmission system determines the locked valve banks according to different working conditions, so that the transmission flexibility of the multi-terminal direct current transmission system is enhanced, the power transmission of the direct current transmission system is ensured, and the safe and stable operation of the transmission system is improved.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a multi-terminal direct current transmission system double-valve bank sequential locking treatment device for realizing the multi-terminal direct current transmission system double-valve bank sequential locking treatment method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation in the embodiments of the dual valve bank sequential locking handling device of the multi-end direct current transmission system provided below may be referred to the limitation of the dual valve bank sequential locking handling method of the multi-end direct current transmission system hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 7, there is provided a dual valve block sequential lockout handling device of a multi-terminal direct current power transmission system, comprising: an information determination module 10, a single valve bank lockout module 20, an information monitoring module 30, and a sequential lockout module 40, wherein:
The information determining module 10 is configured to determine whether the faulty converter station is the only sending end converter station or the only receiving end converter station when the blocking information of the first valve group of the faulty converter station is detected;
A single valve block latching module 20 for performing a single valve block latching strategy for a faulty converter station if the faulty converter station is not the only sender converter station and the only receiver converter station;
the information monitoring module 30 is configured to determine whether blocking information of a second valve group of the fault pole in the faulty converter station is monitored within a preset time; the fault is the valve bank pole corresponding to the locking information of the first valve bank of the fault converter station;
And the successive locking module 40 is used for 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 pole in all 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 confirmed to be monitored within the preset time.
According to the device for handling the sequential locking of the double valve groups of the multi-terminal direct current transmission system, the locked valve groups are determined in a targeted manner according to different working conditions, all valve groups of all converter stations are not directly controlled to be locked without dividing the 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 continuously locked, only the station is in a pole withdrawal state, and all 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 ensured, and the safe and stable operation of the power transmission system is improved.
In one embodiment, the single valve train latching module 20 is configured to implement a unique station single valve train latching strategy if the failed converter station is the only sender converter station or the only receiver converter station; wherein executing a unique standing single valve group latching strategy comprises: one valve bank of the double valve banks of the fault pole in all the converter stations is controlled to be blocked, and the other valve bank is matched with the fault pole to be in current control zero.
In one embodiment, successive latching modules 40 are used to determine the latching information of the second valve block that monitors the faulty pole in the faulty converter station and to control the dual valve block latching of the faulty pole in all the converter stations.
In one embodiment, a single valve block latching module 20 for controlling the latching of a first valve block of a faulty pole in a faulty converter station, the other valve block cooperating with a faulty pole current control zero; and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current control zero.
In one embodiment, the successive blocking module 40 is configured to control the double valve groups of the faulty pole in all other converter stations to complete the faulty pole current control zero and control blocking of one valve group of the double valve groups of the faulty pole in all other converter stations if blocking information of the second valve group of the faulty pole in the faulty converter station is not detected within a preset time.
In one embodiment, the successive latching module 40 is configured to control the faulty pole in all other converter stations to maintain the single valve bank operation if the latching information of the second valve bank of the faulty pole in the faulty converter station is monitored after the preset time is exceeded.
The modules in the double valve group sequential locking treatment device of the multi-terminal direct current transmission system can be fully or partially realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules
In one embodiment, a computer device is provided, which may be a server, and the internal structure of which may be as shown in fig. 8. The computer device includes a processor, a memory, an Input/Output interface (I/O) 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, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing related data of a double-valve group sequential locking treatment method of the multi-terminal direct current transmission system. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a multi-port direct current transmission system double valve block sequential lockout handling method.
It will be appreciated by those skilled in the art that the structure shown in FIG. 8 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the 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 stored therein a computer program, the processor when executing the computer program performing the steps of: when the locking information of the first valve group of the fault converter station is determined to be 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 sending 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 is the valve bank pole corresponding to the locking information of the first valve bank of the fault converter station; and if the locking information of the second valve bank of the fault pole in the fault current converter station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current converter station to be locked, and controlling the double valve banks of the fault pole in all other current 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 converter station or the only receiving converter station, executing a locking strategy of the single valve group of the only station; wherein executing a unique standing single valve group latching strategy comprises: one valve bank of the double valve banks of the fault pole in all the converter stations is controlled to be blocked, and the other valve bank is matched with the fault pole to be in current control zero.
In one embodiment, the processor when executing the computer program further performs the steps of: and determining locking information of a second valve bank of the fault pole in the fault converter station, and controlling double valve banks of the fault poles in all the converter stations to be locked.
In one embodiment, the processor when executing the computer program further performs the steps of: a first valve bank of a fault pole in the fault converter station is controlled to be locked, and the other valve bank is matched with the fault pole to be in current control zero; and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current control 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 bank of the fault pole in the fault current converting station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other current converting stations to complete the fault pole current control zero, and controlling one valve bank in the double valve banks of the fault pole in all other current converting 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 all 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 the locking information of the first valve group of the fault converter station is determined to be 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 sending 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 is the valve bank pole corresponding to the locking information of the first valve bank of the fault converter station; and if the locking information of the second valve bank of the fault pole in the fault current converter station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current converter station to be locked, and controlling the double valve banks of the fault pole in all other current 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 converter station or the only receiving converter station, executing a locking strategy of the single valve group of the only station; wherein executing a unique standing single valve group latching strategy comprises: one valve bank of the double valve banks of the fault pole in all the converter stations is controlled to be blocked, and the other valve bank is matched with the fault pole to be in current control zero.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining locking information of a second valve bank of the fault pole in the fault converter station, and controlling double valve banks of the fault poles in all the converter stations to be locked.
In one embodiment, the computer program when executed by the processor further performs the steps of: a first valve bank of a fault pole in the fault converter station is controlled to be locked, and the other valve bank is matched with the fault pole to be in current control zero;
And controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current control 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 bank of the fault pole in the fault current converting station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other current converting stations to complete the fault pole current control zero, and controlling one valve bank in the double valve banks of the fault pole in all other current converting 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 all 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 the locking information of the first valve group of the fault converter station is determined to be 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 sending 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 is the valve bank pole corresponding to the locking information of the first valve bank of the fault converter station; and if the locking information of the second valve bank of the fault pole in the fault current converter station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current converter station to be locked, and controlling the double valve banks of the fault pole in all other current 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 converter station or the only receiving converter station, executing a locking strategy of the single valve group of the only station; wherein executing a unique standing single valve group latching strategy comprises: one valve bank of the double valve banks of the fault pole in all the converter stations is controlled to be blocked, and the other valve bank is matched with the fault pole to be in current control zero.
In one embodiment, the computer program when executed by the processor further performs the steps of: and determining locking information of a second valve bank of the fault pole in the fault converter station, and controlling double valve banks of the fault poles in all the converter stations to be locked.
In one embodiment, the computer program when executed by the processor further performs the steps of: a first valve bank of a fault pole in the fault converter station is controlled to be locked, and the other valve bank is matched with the fault pole to be in current control zero; and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current control 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 bank of the fault pole in the fault current converting station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other current converting stations to complete the fault pole current control zero, and controlling one valve bank in the double valve banks of the fault pole in all other current converting 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 all the fault poles in all the other converter stations to keep the single valve bank to operate.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in 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), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (9)
1. A method for handling sequential blocking of double valve blocks of a multi-terminal direct current transmission system, the method comprising:
when the locking information of a first valve group of the fault converter station is determined to be 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 converter station and the only receiving 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 the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
if the locking information of the second valve bank of the fault pole in the fault current conversion station is determined to be monitored within the preset time, controlling the double valve banks of the fault pole in the fault current conversion station to be locked, and controlling the double valve banks of the fault pole in all other current conversion stations to keep running;
after determining whether the locking information of the second valve group of the fault pole in the fault current converter station is monitored within the preset time, the method further comprises:
And if the locking information of the second valve bank of the fault pole in the fault current converting station is not monitored within the preset time, controlling the double valve banks of the fault pole in all other current converting stations to complete the current control zero of the fault pole, and controlling one valve bank in the double valve banks of the fault pole in all other current converting stations to be locked.
2. The method of claim 1, wherein after said determining whether the failed converter station is the only sender converter station or the only receiver converter station, further comprising:
If the fault converter station is the only transmitting converter station or the only receiving converter station, executing a single station valve group locking strategy; wherein said executing a unique station single valve set latching strategy comprises: and locking one valve bank in the double valve banks for controlling the fault poles in all the converter stations, and matching the other valve bank with the fault pole to realize current control zero.
3. The method of claim 2, wherein after said executing the unique station-one valve set latching strategy, further comprising:
And determining locking information of a second valve bank of the fault pole in the fault converter station, and controlling double valve banks of the fault poles in all the converter stations to be locked.
4. The method of claim 1, wherein said executing a faulty converter station single valve block latching strategy comprises:
controlling a first valve bank of a fault pole in the fault current converting station to be locked, and matching the other valve bank with the fault pole to control zero;
and controlling the double valve groups of the fault poles in all other converter stations to cooperate with the fault pole current to control zero.
5. The method of claim 1, wherein after said controlling one of the double valve sets of the faulty pole in the faulty converter station for all remaining converter stations is blocked, further comprising:
and if the locking information of the second valve group of the fault pole in the fault current converter station is monitored after the preset time is exceeded, controlling all the fault poles in the rest current converter stations to keep the single valve group to operate.
6. A dual valve train sequential lockout handling device for a multi-port dc power transmission system, the device comprising:
The information judging module is used for judging whether the fault current transformer station is the only current transformer station at the transmitting end or the only current transformer station at the receiving end when the locking information of the first valve group of the fault current transformer station is detected;
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 and the only receiving end converter station;
The information monitoring module is used for determining whether locking information of a second valve group of the fault pole in the fault current converter station is monitored in preset time; the fault pole is the pole of the valve bank corresponding to the locking information of the first valve bank of the fault converter station;
The sequential locking module is used for controlling the double valve groups of the fault pole in the fault current converter station to be locked and controlling the double valve groups of the fault pole in all other current converter stations to keep running if the locking information of the second valve group of the fault pole in the fault current converter station is determined to be monitored within the preset time;
And the sequential locking module is further used for controlling the double valve groups of the fault pole in all 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 other converter stations to be locked 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.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.
9. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 5.
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