CN115513919A - Last circuit breaker protection method, device and equipment for flexible direct current transmission project - Google Patents
Last circuit breaker protection method, device and equipment for flexible direct current transmission project Download PDFInfo
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- CN115513919A CN115513919A CN202211349552.4A CN202211349552A CN115513919A CN 115513919 A CN115513919 A CN 115513919A CN 202211349552 A CN202211349552 A CN 202211349552A CN 115513919 A CN115513919 A CN 115513919A
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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 final circuit breaker protection method, a device and equipment for a flexible direct current transmission project, wherein the method comprises the steps of obtaining opening and closing states and tripping signals of all circuit breakers in a flexible direct current back-to-back system; and determining the connection relation between the current conversion unit and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the protection of the circuit breaker executes action locking direct current operation or not according to the connection relation. The last circuit breaker protection method of the flexible direct current transmission project judges whether the last circuit breaker protection executes action locking direct current operation or not according to the opening and closing states and the tripping signals of all circuit breakers, and avoids the situation that the circuit breaker protection configuration fails due to the fact that alternating current outgoing lines lose power in the flexible direct current back-to-back project; the technical problem that the protection configuration of the circuit breaker fails due to the fact that an alternating current outgoing line loses power in the existing protection configuration mode of the circuit breaker in flexible direct current back-to-back engineering is solved.
Description
Technical Field
The application relates to the technical field of flexible direct current transmission, in particular to a method, a device and equipment for protecting a last circuit breaker of a flexible direct current transmission project.
Background
With the increase of the scale of the power grid, the short-circuit current of the large power grid in a core load area approaches to the breaking capacity of an alternating-current circuit breaker, and the problem of exceeding the standard of the short-circuit current becomes an important factor influencing the safety and stability of the power grid. In order to solve the problem of short-circuit current of the large power grid, flexible direct current back-to-back engineering can be built in a core area of the power grid, the large power grid is divided into two small power grids, and the two small power grids are interconnected through the flexible direct current engineering, so that the short-circuit current of the power grid is reduced.
In the flexible direct current back-to-back engineering, the last breaker protection is needed to be set to identify the working condition of the last breaker, the safety of the direct current protection equipment is locked, and in addition, a locking signal can be generated in time to provide a stable control system for corresponding load cutting processing of a generator cutter. However, when the inverter is in the last working condition of the circuit breaker in the existing flexible direct current back-to-back engineering, the loss of alternating current outgoing lines in the flexible direct current back-to-back engineering can cause the inverter to be incapable of being controlled normally, and further overvoltage can endanger the safety damage of equipment, so that the protection configuration of the circuit breaker is caused to be invalid, and the safety of a power grid is influenced.
Disclosure of Invention
The embodiment of the application provides a last circuit breaker protection method, a last circuit breaker protection device and last circuit breaker protection equipment for flexible direct current transmission engineering, and is used for solving the technical problem that circuit breaker protection configuration fails due to the fact that an alternating current outgoing line loses power in the existing circuit breaker protection configuration mode in the flexible direct current back-to-back engineering.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a last circuit breaker protection method of a flexible direct current transmission project is applied to a flexible direct current back-to-back system, the flexible direct current back-to-back system comprises a direct current converter station and a next-stage transformer substation connected with the direct current converter station through a plurality of alternating current outgoing lines, the direct current converter station comprises a converter unit, a rectifier side alternating current field and an inverter alternating current field, the rectifier side alternating current field and the inverter alternating current field are connected with each alternating current outgoing line, circuit breakers connected with each alternating current outgoing line are arranged on the inverter alternating current field and the rectifier side alternating current field, and the rectifier side alternating current field and the inverter alternating current field are provided with a last circuit breaker protection, and the last circuit breaker protection method comprises the following steps:
acquiring opening and closing states and tripping signals of all circuit breakers in the flexible direct current back-to-back system;
and determining the connection relation between the current conversion unit or the next-stage transformer substation and an alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether action locking direct current operation is executed or not according to the connection relation.
Preferably, the determining whether the last breaker protection performs the action locking direct current operation according to the connection relation comprises:
if the connection relationship is that the current conversion unit is disconnected with the alternating current outlet and meets the alternating current voltage criterion, controlling the final circuit breaker to protect and execute action locking direct current operation;
and if the connection relationship is that the circuit breaker of the next-stage transformer substation is disconnected with the alternating current outlet, controlling the final circuit breaker to perform protection action locking direct current operation.
Preferably, the alternating voltage criterion includes: and according to the connection relationship, disconnecting the current conversion unit from the alternating current outlet, acquiring an effective value of the alternating current voltage of the flexible direct current back-to-back system, and if the effective value of the alternating current voltage is greater than a fixed voltage threshold value, meeting an alternating current voltage criterion.
Preferably, the last circuit breaker protection method of the flexible direct current transmission project comprises the following steps: determining whether a breaker connected with the alternating current outgoing line is in a tripping state by adopting a three-out-of-one principle, wherein the three-out-of-one principle comprises the following steps: if any phase of the breaker is in the open position, the breaker is in the open state.
The application further provides a last circuit breaker protection device of the flexible direct-current transmission project, which is applied to a flexible direct-current back-to-back system, wherein the flexible direct-current back-to-back system comprises a direct-current converter station and a next-stage transformer substation connected with the direct-current converter station through a plurality of alternating current outgoing lines, the direct-current converter station comprises a current conversion unit, a rectification side alternating current field and an inverter alternating current field, the rectification side alternating current field and the inverter alternating current field are connected with each alternating current outgoing line, circuit breakers connected with each alternating current outgoing line are arranged on the inverter alternating current field and the rectification side alternating current field, the rectification side alternating current field and the inverter alternating current field are provided with last circuit breaker protection, and the last circuit breaker protection device comprises a data acquisition module and a judgment protection module;
the data acquisition module is used for acquiring the opening and closing state and the tripping signal of the circuit breaker in the flexible direct current back-to-back system;
and the judgment protection module is used for determining the connection relation between the current conversion unit or the next-stage transformer substation and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the final circuit breaker protection executes action locking direct current operation according to the connection relation.
Preferably, the judgment and protection module is further configured to disconnect the commutation unit from the ac outgoing line according to the connection relationship, and control the final circuit breaker to perform protection action locking dc operation if the connection relationship meets an ac voltage criterion; and/or controlling the last breaker to perform protection action locking direct current operation if the breaker of the next-stage transformer substation is disconnected with the alternating current outlet according to the connection relation.
Preferably, the alternating voltage criterion includes: and according to the connection relationship, disconnecting the current conversion unit from the alternating current outlet, acquiring an effective value of the alternating current voltage of the flexible direct current back-to-back system, and if the effective value of the alternating current voltage is greater than a fixed voltage threshold value, meeting an alternating current voltage criterion.
Preferably, the last circuit breaker protection device of the flexible direct current transmission project includes a tripping judgment module, where the tripping judgment module is configured to determine whether a circuit breaker connected to the alternating current outgoing line is in a tripping state by using a rule of three-out-of-one, where the rule of three-out-of-one includes: if any phase of the breaker is in the open position, the breaker is in the open state.
The present application also provides a storage device, in which a plurality of program codes are stored, and the program codes are suitable for being loaded and executed by a processor to execute the last circuit breaker protection method of the flexible direct current transmission project.
The application also provides a terminal device, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the last circuit breaker protection method of the flexible direct current power transmission project according to an instruction in the program code.
According to the technical scheme, the embodiment of the application has the following advantages: the method comprises the steps of obtaining opening and closing states and tripping signals of all circuit breakers in a flexible direct current back-to-back system; and determining the connection relation between the current conversion unit and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the circuit breaker protection executes action locking direct current operation or not according to the connection relation. The last circuit breaker protection method of the flexible direct current transmission project judges whether the last circuit breaker protection executes action locking direct current operation or not according to the opening and closing states and the tripping signals of all circuit breakers, and avoids the failure of circuit breaker protection configuration caused by the fact that alternating current outgoing lines lose power in the flexible direct current back-to-back project; the technical problem that the protection configuration of the circuit breaker fails due to the fact that an alternating current outgoing line loses power in the existing protection configuration mode of the circuit breaker in flexible direct current back-to-back engineering is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for protecting a final circuit breaker in a flexible direct current transmission project according to an embodiment of the present disclosure;
fig. 2 is a frame diagram of a flexible dc back-to-back system according to an embodiment of the present application;
fig. 3 is a frame diagram of a final breaker protection device in the flexible direct current transmission project according to an embodiment of the present application.
Detailed Description
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The application provides a final breaker protection method, a final breaker protection device and final breaker protection equipment for flexible direct current transmission engineering, which are used for solving the technical problem that the breaker protection configuration fails due to the fact that an alternating current outgoing line loses power in the existing breaker protection configuration mode in the flexible direct current back-to-back engineering.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a method for protecting a final circuit breaker in a flexible direct current transmission project according to an embodiment of the present disclosure, and fig. 2 is a frame diagram illustrating a flexible direct current back-to-back system according to an embodiment of the present disclosure.
As shown in fig. 2, the present application provides a method for protecting a final circuit breaker in a flexible dc power transmission project, which is applied to a flexible dc back-to-back system, where the flexible dc back-to-back system includes a dc converter station 10 and a next-stage substation 20 connected to the dc converter station through a plurality of ac outgoing lines, the dc converter station 10 includes a converter unit, and a rectifier-side ac field 12 and an inverter ac field 13 connected to the converter unit, circuit breakers connected to each ac outgoing line are disposed on the inverter ac field 12 and the rectifier-side ac field 12, the inverter ac field 13 and the rectifier-side ac field 12 are both connected to each ac outgoing line, and the rectifier-side ac field 12 and the inverter ac field 13 are both configured with final circuit breaker protection.
The rectifier-side commutation field 12 is provided with a breaker 5011, a breaker 5021, a breaker 5012, a breaker 5023, a breaker 5013, and a breaker 5024, the breaker 5011 is connected in series with the breaker 5012 and is connected to the rectifier side of the first commutation cell 11, the breaker 5012 is connected in series with the breaker 5013 and is grounded, the breaker 5023 is connected in series with the breaker 5024 and is connected to the rectifier side of the second commutation cell 14, and the breaker 5021 is connected in series with the breaker 5022 and is grounded. The inverter ac field 13 is provided with a circuit breaker 5031, a circuit breaker 5032, a circuit breaker 5033, a circuit breaker 5041, a circuit breaker 5042, and a circuit breaker 5043, the circuit breaker 5031 is connected in series with the circuit breaker 5032 and is connected to the inverter side of the first commutation cell 11, the circuit breaker 5032 is connected in series with the circuit breaker 5033 and is connected to the next-stage substation 20 through a second ac outlet line 32, the circuit breaker 5041 is connected in series with the circuit breaker 5042 and is connected to the next-stage substation 20 through a first ac outlet line 31, and the circuit breaker 5042 is connected in series with the circuit breaker 5043 and is connected to the inverter side of the second ac cell 14. The next-stage substation 20 is provided with a circuit breaker 5051, a circuit breaker 5053, a circuit breaker 5061, a circuit breaker 5062, a circuit breaker 5063, a circuit breaker 5071, a circuit breaker 5072, and a circuit breaker 5073, the circuit breaker 5051 and the circuit breaker 5052 are connected in series and are connected to the first ac outgoing line 3, the circuit breaker 5052 and the circuit breaker 5053 are connected in series and are grounded, respectively, the circuit breaker 5062 and the circuit breaker 5063 are connected in series and are connected to the second ac outgoing line 32, respectively, and the circuit breaker 5061 and the circuit breaker 5062 are connected in series and are grounded, respectively; the breaker 5071, the breaker 5072 and the breaker 5073 are connected in series and are grounded, respectively.
As shown in fig. 1, the final circuit breaker protection method of the flexible direct current transmission project includes the following steps:
s10, obtaining the opening and closing state and the tripping signal of the circuit breaker in the flexible direct current back-to-back system.
In step S10, the switching on/off states of all the circuit breakers in the dc converter station and trip signals such as circuit breakers and ac outgoing lines are mainly acquired.
And S20, determining the connection relation between the current conversion unit or the next-stage transformer substation and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the circuit breaker protection executes action locking direct current operation or not according to the connection relation.
It should be noted that, in step S20, it is mainly determined whether each converter unit on the flexible dc back-to-back system is connected to each ac outlet according to whether each breaker on the dc converter station trips or is in a tripping state, so as to determine whether to execute an action locking dc operation for protecting a last breaker on the dc converter station.
In the embodiment of the application, the method for protecting the last circuit breaker in the flexible direct current transmission project executes the protection work of the last circuit breaker in the direct current converter station according to the judgment of the step S20, so that the failure of the protection configuration of the circuit breaker caused by the loss of power of an alternating current outlet in the flexible direct current back-to-back project is avoided.
The last circuit breaker protection method for the flexible direct current transmission project comprises the steps of obtaining a circuit breaker opening and closing state and a tripping signal in a flexible direct current back-to-back system; and determining the connection relation between the current conversion unit and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the circuit breaker protection executes action locking direct current operation or not according to the connection relation. The last circuit breaker protection method of the flexible direct current transmission project judges whether the last circuit breaker protection executes action locking direct current operation or not according to the opening and closing state and the tripping signal of the circuit breaker, and avoids the failure of circuit breaker protection configuration caused by the loss of power of an alternating current outlet in the flexible direct current back-to-back project; the technical problem that the protection configuration of the circuit breaker fails due to the fact that an alternating current outgoing line loses power in the existing protection configuration mode of the circuit breaker in flexible direct current back-to-back engineering is solved.
In one embodiment of the present application, determining whether the last circuit breaker protection performs the action blocking dc operation according to the connection relationship comprises:
if the connection relation is that the current conversion unit is disconnected with the alternating current outgoing line and meets the alternating current voltage criterion, controlling the final circuit breaker to protect and execute action locking direct current operation;
and if the connection relationship is that the next-stage transformer substation is disconnected with all the alternating current outgoing lines, controlling the final breaker to protect and execute action locking direct current operation.
It should be noted that, as shown in fig. 2, if the circuit breaker 5031 and the circuit breaker 5033 trip and disconnect, the inverter side of the first commutation unit and the second ac outgoing line are connected only through the interrupt circuit 5032, that is, if the connection relationship is that the commutation unit is connected to at least one ac outgoing line and the operation condition of the last circuit breaker is not satisfied, the last circuit breaker protection is controlled not to perform the action latching dc operation. As shown in fig. 2, when the first ac outlet and the second ac outlet are both disconnected from the next-stage substation, the final breaker is controlled to perform protection action to lock the dc operation. Or according to the series connection condition of the first alternating current outgoing line and the second alternating current outgoing line in the next-stage transformer substation, for example: the circuit breaker 5051, the circuit breaker 5052 and the circuit breaker 5053 are tripped or are in an opening state, the circuit breaker 5061, the circuit breaker 5062 and the circuit breaker 5063 are tripped or are in an opening state, namely, the first alternating current outgoing line and the second alternating current outgoing line are both lost in electrical connection with a next-stage transformer substation, and a locking signal is sent out to control the last circuit breaker to perform action locking direct current operation.
In one embodiment of the present application, the ac voltage criteria include: and according to the connection relation, the current conversion unit is disconnected with the alternating current outgoing line, the effective value of the alternating current voltage of the flexible direct current back-to-back system is obtained, and if the effective value of the alternating current voltage is larger than the fixed voltage threshold value, the alternating current voltage criterion is met.
It should be noted that the voltage threshold can be set according to the requirement of the flexible dc back-to-back system, and is not limited herein in detail. According to the method for protecting the last circuit breaker of the flexible direct-current transmission project, the protection of the last circuit breaker is configured on the alternating-current field of the rectification side and the alternating-current field of the inverter, so that the misoperation can be prevented. The last circuit breaker protection method of the flexible direct current transmission project judges whether to control the last circuit breaker to perform action locking direct current operation or not according to the effective value of the alternating current voltage, and overvoltage protection of a flexible direct current back-to-back system is achieved.
In an embodiment of the present application, the method for protecting a last circuit breaker in a flexible direct current transmission project may also determine whether to execute an action blocking direct current operation for the last circuit breaker protection according to a circuit breaker opening/closing state, that is, if all circuit breakers connected to an alternating current outgoing line are in an opening state, control the last circuit breaker protection to execute the action blocking direct current operation. Wherein, adopt three to get a principle and confirm whether the circuit breaker of being connected with the alternating current line of being qualified for the next round of competitions is in the separating brake state, three get a principle and include: if any phase of the breaker is in open position, the breaker is in open state
The three-to-one circuit breaker is configured with three ABC phases, and the circuit breaker is determined to be in the open state as long as any one phase of the circuit breaker is open. As shown in fig. 2, if the second ac outgoing line stops working, only the first ac outgoing line runs, and if a line a-phase fault (also called single-phase trip) occurs on the first ac outgoing line at this time, the ac protection operates, the a-phase of the circuit breaker 5041 and the circuit breaker 5042 connected to the first ac outgoing line is separated, at this time, the flexible dc back-to-back system is in the open-phase running state, and the circuit breaker 5041 and the circuit breaker 5042 are in the open-circuit state according to the criterion of three, the circuit breaker is controlled to perform protection operation to lock the dc operation.
As shown in fig. 2, according to the obtained rectifying side ac flow field, the inverting side ac flow field, and the breaker opening and closing state and the trip signal of the next-stage substation, the rectifying side dc controller corresponding to the rectifying side ac flow field and the inverting side dc controller corresponding to the inverting side ac flow field respectively control whether the corresponding last breaker executes the protection action blocking dc according to the last breaker protection method of the flexible dc power transmission project, and the inverting side dc controller also analyzes the breaker opening and closing state and the trip signal of the next-stage substation according to the last breaker protection method of the flexible dc power transmission project to obtain the blocking signal whether to control the last breaker to execute the protection action blocking dc operation.
Example two:
fig. 3 is a frame diagram of a final breaker protection device in the flexible direct current transmission project according to an embodiment of the present application.
As shown in fig. 3, the present application further provides a final circuit breaker protection device for a flexible dc power transmission project, which is applied to a flexible dc back-to-back system, where the flexible dc back-to-back system includes a dc converter station and a next-stage substation connected to the dc converter station through a plurality of ac outgoing lines, the dc converter station includes a converter unit, and a rectifier-side ac field and an inverter ac field connected to the converter unit, the rectifier-side ac field and the inverter ac field are both connected to each ac outgoing line, circuit breakers connected to each ac outgoing line are disposed on the inverter ac field and the rectifier-side ac field, and the rectifier-side ac field and the inverter ac field are both configured with final circuit breaker protection, and the final circuit breaker protection device includes a data acquisition module 10 and a judgment protection module 20;
the data acquisition module 10 is used for acquiring the opening and closing state and the tripping signal of the circuit breaker in the flexible direct current back-to-back system;
and the judgment protection module 20 is used for determining the connection relation between the current conversion unit or the next-stage transformer substation and the alternating current outgoing line according to the trip signal and the opening and closing state of the circuit breaker, and determining whether the circuit breaker protection executes action locking direct current operation or not according to the connection relation.
In the embodiment of the present application, the judgment and protection module 20 is further configured to disconnect the commutation unit from the ac outgoing line according to the connection relationship, and control the circuit breaker to perform protection action locking dc operation if the connection relationship meets the ac voltage criterion; and/or controlling the circuit breaker of the next-level transformer substation to perform action locking direct-current operation by controlling the circuit breaker to be in protection and execute action locking direct-current operation when the circuit breaker of the next-level transformer substation is disconnected with the alternating-current outgoing line according to the connection relation.
In the embodiment of the present application, the ac voltage criterion includes: and according to the connection relation, the current conversion unit is disconnected with the alternating current outgoing line, the effective value of the alternating current voltage of the flexible direct current back-to-back system is obtained, and if the effective value of the alternating current voltage is larger than the fixed voltage threshold value, the alternating current voltage criterion is met.
In this application embodiment, this last circuit breaker protection device of flexible direct current transmission engineering includes separating brake judgement module, and separating brake judgement module is used for adopting three to get a principle and confirms whether the circuit breaker of being connected is in the separating brake state with exchanging outgoing lines, three get a principle and include: if any phase of the breaker is in the open position, the breaker is in the open state.
It should be noted that the contents of the modules in the second embodiment correspond to the steps in the first embodiment, the contents of the steps in the first embodiment have been described in detail in the first embodiment, and the contents of the modules in the system are not repeated in the second embodiment.
Example three:
the present application also provides a storage device having stored therein a plurality of program codes adapted to be loaded and run by a processor to perform the last circuit breaker protection method of the flexible direct current transmission project described above.
Example four:
the application also provides a terminal device, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the final breaker protection method of the flexible direct current transmission project according to instructions in the program codes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A last circuit breaker protection method of a flexible direct-current transmission project is applied to a flexible direct-current back-to-back system, the flexible direct-current back-to-back system comprises a direct-current converter station and a next-stage transformer substation connected with the direct-current converter station through a plurality of alternating-current outgoing lines, the direct-current converter station comprises a converter unit, a rectifier side alternating-current field and an inverter alternating-current field, the rectifier side alternating-current field and the inverter alternating-current field are connected with each alternating-current outgoing line, and circuit breakers connected with each alternating-current outgoing line are arranged on the inverter alternating-current field and the rectifier side alternating-current field, and the last circuit breaker protection method is characterized in that the rectifier side alternating-current field and the inverter alternating-current field are provided with last circuit breaker protection, and comprises the following steps:
acquiring a breaker opening and closing state and a tripping signal in a flexible direct current back-to-back system;
and determining the connection relation between the current conversion unit or the next-stage transformer substation and an alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the protection of the final circuit breaker executes action locking direct current operation or not according to the connection relation.
2. The last circuit breaker protection method of the flexible direct current transmission project according to claim 1, wherein determining whether the last circuit breaker protection performs an action blocking direct current operation according to the connection relation comprises:
if the connection relationship is that the current conversion unit is disconnected with the alternating current outlet and meets the alternating current voltage criterion, controlling the final circuit breaker to protect and execute action locking direct current operation;
and if the connection relation is that the next-stage transformer substation is disconnected with all the alternating current outgoing lines, controlling the final breaker to perform protection action locking direct current operation.
3. The last circuit breaker protection method of the flexible direct current transmission project according to claim 2, characterized in that the alternating voltage criterion comprises: and according to the connection relation, disconnecting the current conversion unit from the alternating current outgoing line, acquiring an effective value of the alternating current voltage of the flexible direct current back-to-back system, and if the effective value of the alternating current voltage is greater than a fixed voltage threshold value, meeting an alternating current voltage criterion.
4. The method for protecting a final circuit breaker of a flexible direct current transmission project according to claim 1, is characterized by comprising the following steps: determining whether a breaker connected with the alternating current outgoing line is in a tripping state by adopting a three-out-of-one principle, wherein the three-out-of-one principle comprises the following steps: if any phase of the breaker is in the open position, the breaker is in the open state.
5. A last circuit breaker protection device of a flexible direct current transmission project is applied to a flexible direct current back-to-back system, the flexible direct current back-to-back system comprises a direct current converter station and a next-stage transformer substation connected with the direct current converter station through a plurality of alternating current outgoing lines, the direct current converter station comprises a converter unit, a rectifier side alternating current field and an inverter alternating current field, the rectifier side alternating current field and the inverter alternating current field are connected with each alternating current outgoing line, and circuit breakers connected with each alternating current outgoing line are arranged on the inverter alternating current field and the rectifier side alternating current field;
the data acquisition module is used for acquiring the opening and closing state and the tripping signal of the circuit breaker in the flexible direct current back-to-back system;
and the judgment and protection module is used for determining the connection relation between the current conversion unit or the next-stage transformer substation and the alternating current outgoing line according to the tripping signal and the opening and closing state of the circuit breaker, and determining whether the final circuit breaker protection executes action locking direct current operation or not according to the connection relation.
6. The last circuit breaker protection device of the flexible direct-current transmission project according to claim 5, wherein the judgment and protection module is further configured to disconnect the commutation unit from the alternating-current outgoing line according to the connection relationship, and if an alternating-current voltage criterion is met, control a last circuit breaker to perform protection action locking direct-current operation; and/or controlling the last breaker to perform protection action locking direct current operation if the breaker of the next-stage transformer substation is disconnected with the alternating current outlet according to the connection relation.
7. Last circuit breaker protection device of the flexible direct current transmission project according to claim 6, characterized in that said alternating voltage criterion comprises: and according to the connection relationship, disconnecting the current conversion unit from the alternating current outlet, acquiring an effective value of the alternating current voltage of the flexible direct current back-to-back system, and if the effective value of the alternating current voltage is greater than a fixed voltage threshold value, meeting an alternating current voltage criterion.
8. The last circuit breaker protection device of the flexible direct current transmission project according to claim 5, characterized by comprising a switching-off judgment module, wherein the switching-off judgment module is configured to determine whether the circuit breaker connected to the alternating current outgoing line is in a switching-off state by using a one-out-of-three principle, and the one-out-of-three principle comprises: if any phase of the breaker is in the open position, the breaker is in the open state.
9. A storage device having stored therein a plurality of program codes, characterized in that said program codes are adapted to be loaded and run by a processor to perform a last circuit breaker protection method of a flexible direct current transmission project according to any of claims 1-4.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for protecting a last circuit breaker of a flexible direct current transmission project according to any one of claims 1 to 4 according to instructions in the program code.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211349552.4A CN115513919A (en) | 2022-10-31 | 2022-10-31 | Last circuit breaker protection method, device and equipment for flexible direct current transmission project |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211349552.4A CN115513919A (en) | 2022-10-31 | 2022-10-31 | Last circuit breaker protection method, device and equipment for flexible direct current transmission project |
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| CN115513919A true CN115513919A (en) | 2022-12-23 |
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| CN202211349552.4A Pending CN115513919A (en) | 2022-10-31 | 2022-10-31 | Last circuit breaker protection method, device and equipment for flexible direct current transmission project |
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| CN (1) | CN115513919A (en) |
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