CN111600286B - Coordination control method for superconducting current limiter and direct current breaker - Google Patents
Coordination control method for superconducting current limiter and direct current breaker Download PDFInfo
- Publication number
- CN111600286B CN111600286B CN202010561984.6A CN202010561984A CN111600286B CN 111600286 B CN111600286 B CN 111600286B CN 202010561984 A CN202010561984 A CN 202010561984A CN 111600286 B CN111600286 B CN 111600286B
- Authority
- CN
- China
- Prior art keywords
- direct current
- superconducting
- current limiter
- current
- superconducting current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/023—Current limitation using superconducting elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
-
- 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
Abstract
The disclosure relates to the technical field of direct current transmission, in particular to a coordination control method of a superconducting current limiter and a direct current breaker. The method is used in a coordination control system, the coordination control system comprises a direct current breaker, a superconducting current limiter connected with the direct current breaker in series and a direct current transmission power grid system connected with the superconducting current limiter, when the direct current transmission power grid system fails, the superconducting current limiter and the direct current breaker carry out coordination control on the magnitude of fault current, and the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current. According to the embodiment of the disclosure, the fault current can be reduced through the superconducting current limiter under the condition that the direct current transmission power grid system has a fault, that is, the requirement for the current breaking of the direct current short-circuiting device is reduced, so that the manufacturing requirement for the direct current breaker is reduced.
Description
Technical Field
The disclosure relates to the technical field of direct current transmission, in particular to a coordination control method of a superconducting current limiter and a direct current breaker.
Background
In the direct current transmission power grid project, in order to solve the problem of direct current line faults, at present, direct current circuit breakers are usually additionally arranged on two sides of a direct current line, and the direct current circuit breakers can achieve the effects of clearing and isolating the faults in the direct current transmission power grid.
However, in the above method, when the dc breaker is used to isolate the dc line fault, the dc breaker needs to cut the ac/dc current excessively, and the manufacturing requirement for the dc breaker is excessively high.
Disclosure of Invention
In view of the above, the present disclosure provides a method for coordinating and controlling a superconducting current limiter and a dc circuit breaker. The technical scheme comprises the following steps:
according to an aspect of the present disclosure, there is provided a coordinated control method of a superconducting current limiter and a dc circuit breaker, for use in a coordinated control system including the dc circuit breaker, the superconducting current limiter connected in series with the dc circuit breaker, and a dc power transmission grid system connected to the superconducting current limiter, the method including:
when the direct current transmission power grid system has a fault, the superconducting current limiter and the direct current breaker carry out coordination control on the magnitude of fault current, and the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current.
In a possible implementation manner, the coordinated control system further includes a dc protection system and a dc control system, the dc control system is respectively connected to the dc protection system, the dc circuit breaker and the superconducting current limiter, the dc protection system is connected to the superconducting current limiter, and when the dc power transmission grid system fails, the superconducting current limiter and the dc circuit breaker perform coordinated control on the magnitude of the fault current, including:
when the direct current transmission power grid system has a fault, the direct current protection system transmits fault information to the direct current control system, wherein the fault information is used for indicating the position of the fault;
the direct current control system switches on or off the direct current breaker according to the fault information;
after the direct current breaker is switched off, the direct current control system closes a bypass switch of the superconducting current limiter, and the bypass switch of the superconducting current limiter is used for shunting protection of the superconducting current limiter.
In another possible implementation manner, when the dc transmission grid system fails, the transmitting, by the dc protection system, failure information to the dc control system includes:
when the direct current meets a preset fault condition, the direct current protection system closes a bypass switch of the superconducting current limiter and transmits the fault information to the direct current control system;
wherein the preset fault condition comprises that the direct current is greater than an overcurrent protection fixed value of the superconducting current limiter.
In another possible implementation manner, before the performing, when the dc transmission grid system fails, coordinated control over the magnitude of the fault current by the superconducting current limiter and the dc breaker, the method further includes:
the direct current control system acquires power plant operation state information, wherein the power plant operation state information is used for indicating the operation condition of power plants around a converter station;
the direct current control system determines an operation mode of the superconducting current limiter according to the power plant operation state information, wherein the operation mode comprises one of a resistor series operation mode, a resistor parallel operation mode and a single resistor operation mode;
the direct current control system transmits the operation mode of the superconducting current limiter to the direct current protection system;
and the direct current protection system determines the over-current protection constant value of the superconducting current limiter according to the operation mode of the superconducting current limiter.
In another possible implementation manner, the determining, by the dc control system, an operation mode of the superconducting current limiter according to the plant operation state information includes:
when the power plant operation state information is used for indicating that the alternating current is smaller than a preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is the resistance parallel operation mode or the single resistance operation mode;
and when the power plant operation state information is used for indicating that the alternating current is greater than or equal to a preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is the resistor series operation mode.
In another possible implementation manner, the determining, by the dc protection system, the overcurrent protection fixed value of the superconducting current limiter according to the operation mode of the superconducting current limiter includes:
the direct current protection system acquires an over-current protection fixed value of the superconducting current limiter corresponding to the operation mode of the superconducting current limiter according to a preset corresponding relation;
the preset corresponding relation comprises a preset corresponding relation between the operation mode of the superconducting current limiter and the overcurrent protection fixed value of the superconducting current limiter.
In another possible implementation manner, the method further includes:
when a non-electrical fault occurs in the superconducting current limiter, the direct current control system closes a bypass switch of the superconducting current limiter.
According to another aspect of the present disclosure, there is provided a coordinated control system comprising a dc breaker, a superconducting current limiter in series with the dc breaker, and a dc transmission grid system connected to the superconducting current limiter,
when the direct current transmission power grid system has a fault, the superconducting current limiter and the direct current breaker are used for performing coordination control on the magnitude of fault current, and the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current.
The embodiment of the disclosure provides a coordination control method of a superconducting current limiter and a direct current breaker, which is used in a coordination control system, wherein the coordination control system comprises the direct current breaker, the superconducting current limiter connected in series with the direct current breaker and a direct current transmission power grid system connected with the superconducting current limiter, when the direct current transmission power grid system fails, the superconducting current limiter and the direct current breaker can coordinate and control the magnitude of fault current, and as the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current, the fault current can be reduced through the superconducting current limiter under the condition that the direct current transmission power grid system fails, namely the requirement on/off current of a direct current short-circuiting device is reduced, so that the manufacturing requirement on the direct current breaker is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 illustrates a schematic structural diagram of a coordinated control system provided by an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a coordinated control system provided in accordance with another exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram illustrating a structure of a superconducting current limiter according to an exemplary embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a method for coordinated control of a superconducting current limiter and a dc circuit breaker according to an exemplary embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a method for coordinated control of a superconducting current limiter and a dc breaker according to another exemplary embodiment of the present disclosure;
fig. 6 shows a schematic structural diagram of a coordinated control system provided in another exemplary embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, components and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
First, an application scenario to which the present disclosure relates will be described.
Referring to fig. 1, a schematic structural diagram of a coordinated control system according to an exemplary embodiment of the present disclosure is shown. The coordinated control system includes: a dc breaker 11, a superconducting current limiter 12 in series with the dc breaker 11, and a dc transmission grid system 13 connected to the superconducting current limiter 12.
Optionally, a superconducting current limiter 14 and a dc breaker 15 are additionally arranged on two sides of a dc line of the coordinated control system.
Optionally, one end of the dc breaker 11 is connected to the superconducting current limiter 12, and the other end of the dc breaker 11 is connected to the converter station.
The coordinated control system further includes: a dc protection system 14 and a dc control system 15. The direct current control system 15 is respectively connected with the direct current protection system 14, the direct current breaker 11 and the superconducting current limiter 12, and the direct current protection system 15 is connected with the superconducting current limiter 12.
The dc protection system 14 and the dc control system 15 may be two systems or may be combined into one system. The embodiments of the present disclosure do not limit this. When the dc protection system 14 and the dc control system 15 are implemented as one system, the system has a control function and a protection function, and real-time performance is improved.
The dc breaker 11 is used for isolating and clearing a fault line of the dc transmission grid system 13.
When the direct current transmission power grid system 13 has a fault, the superconducting current limiter 12 and the direct current breaker 11 are used for performing coordination control on the magnitude of the fault current, so that a fault direct current line is isolated and cleared.
Superconducting current limiter 12 is used to limit fault current, which is beneficial to dc protection system 14 to quickly open and close dc breaker 11.
The resistance of superconducting current limiter 12 is positively correlated with the magnitude of the ac/dc current. The larger the alternating current and the direct current are in the preset numerical range, the larger the resistance value of the superconducting current limiter 12 is, that is, under the condition that the direct current transmission power grid system 13 fails, in the process that the alternating current and the direct current are increased to the preset current threshold value, the resistance value of the superconducting current limiter 12 is increased along with the increase of the alternating current and the direct current, so that the fault current is quickly suppressed, and the on-off current of the direct current breaker 11 is reduced.
In which a bypass switch is connected in parallel to superconducting current limiter 12. The bypass switch of superconducting current limiter 12 is used to isolate a non-electrical fault of superconducting current limiter 12, and to perform shunt protection on the current of superconducting current limiter 12.
The direct current control system 15 is used for receiving a direct current protection action signal and coordinating the opening and closing of the direct current breaker 11 and the bypass of the superconducting current limiter 12 through time sequence coordination.
Referring to fig. 2, a schematic structural diagram of a coordination control system according to another exemplary embodiment of the present disclosure is shown.
The coordinated control system comprises a first dc transmission grid system 21, a first superconducting current limiter 22, a first dc breaker 23, a second dc breaker 24, a second superconducting current limiter 25 and a second dc transmission grid system 26.
A first dc breaker 23 is connected to the first dc transmission grid system 21 via a first superconducting current limiter 22 in series. The second dc breaker 24 is connected to a second dc transmission grid system 26 via a second superconducting current limiter 25 connected in series.
The coordinated control system further comprises a dc control system 27, a first dc protection system 28 and a second dc protection system 29.
The dc control system 27 is connected to the first superconducting current limiter 22, the first dc breaker 23, the second dc breaker 24, the second superconducting current limiter 25, the first dc protection system 28, and the second dc protection system 29, respectively.
The dc control system 27 has a control function for overall controlling the respective devices in the cooperative control system.
First dc protection system 28 is connected to first superconducting current limiter 22 and second dc protection system 29 is connected to second superconducting current limiter 25.
The first dc protection system 28 and the second dc protection system 29 each have a protection function. The first dc protection system 28 is configured to receive a dc protection operation signal, and coordinate opening and closing of the first dc breaker 23 and bypassing of the first superconducting current limiter 22 through timing coordination. The second dc protection system 29 is configured to receive the dc protection action signal, and coordinate the opening and closing of the second dc breaker 24 and the bypass of the second superconducting current limiter 25 through timing coordination.
Optionally, the dc protection system 14, the first dc protection system 28, and the second dc protection system 29 may be three systems, or the first dc protection system 28 and the second dc protection system 29 may be combined into one dc protection system, or the three may be combined into one control and protection integrated system having a control function and a protection function. The embodiments of the present disclosure do not limit this.
Alternatively, the superconducting current limiter (such as superconducting current limiter 12 in fig. 1, first superconducting current limiter 22 or second superconducting current limiter 25 in fig. 2) corresponds to three operation modes, which are a resistor series operation mode, a resistor parallel operation mode and a single resistor operation mode, respectively.
Optionally, the superconducting control protection region of the superconducting current limiter includes two resistors, and the dc control system performs opening and/or closing by controlling a relevant knife switch of the superconducting current limiter, and switches a connection mode of the two resistors, thereby switching an operation mode of the superconducting current limiter. When the two resistors are connected in series and are both connected on a circuit of the superconducting control protection area, the operation mode of the superconducting current limiter is a resistor series operation mode; when the two resistors are connected in parallel and are both connected on a circuit of the superconducting control protection area, the operation mode of the superconducting current limiter is a resistor parallel operation mode; when one of the two resistors is connected to the circuit of the superconducting control protection region, the operation mode of the superconducting current limiter is a single-resistor operation mode.
In one illustrative example, a schematic diagram of a superconducting current limiter is shown in fig. 3. When the disconnecting link DS17 and the disconnecting link DS19 are in a closing state and the disconnecting link DS18 and the disconnecting link DS20 are in an opening state, the two resistors are connected in series and are both connected to a circuit of the superconducting control protection area, and the operation mode of the superconducting current limiter is a resistor series operation mode; when the disconnecting link DS18, the disconnecting link DS19 and the disconnecting link DS20 are in a closing state and the disconnecting link DS17 is in an opening state, the two resistors are connected in parallel and are both connected to a circuit of the superconducting control protection area, and the operation mode of the superconducting current limiter is a resistor parallel operation mode; when the knife switch DS18 and the knife switch DS19 are in a closing state and the knife switch DS17 and the knife switch DS20 are in an opening state, one of the two resistors is connected to a circuit of the superconducting control protection area, and the operation mode of the superconducting current limiter is a single-resistor operation mode.
It should be noted that the specific configuration of the superconducting current limiter is not limited in the embodiments of the present disclosure.
In the following, several exemplary embodiments are used to describe a coordination control method for a superconducting current limiter and a dc circuit breaker provided in the embodiments of the present disclosure.
Referring to fig. 4, a flowchart of a method for coordinated control of a superconducting current limiter and a dc circuit breaker according to an exemplary embodiment of the present disclosure is shown, where the method includes the following steps.
When the direct current transmission power grid system has a fault, the direct current protection system and/or the direct current control system controls the superconducting current limiter and the direct current breaker to realize the coordination control of the magnitude of the fault current.
Optionally, the fault occurring in the dc transmission grid system comprises the fault current and/or the fault voltage exceeding a protection limit.
The resistance value of the superconducting current limiter is in positive correlation with the magnitude of the alternating current and the direct current. The resistance value of the superconducting current limiter is increased along with the increase of the current density, and the superconducting current limiter is used for limiting fault current and is beneficial to a direct current protection system to quickly switch on and off a direct current breaker.
Optionally, the method provided by the embodiment of the present disclosure is used in the coordination control system shown in fig. 1 or fig. 2. For the description of each device in the coordination control system, reference may be made to the relevant details in the above embodiments, which are not repeated herein.
To sum up, the embodiment of the present disclosure provides a coordination control method for a superconducting current limiter and a dc circuit breaker, which is used in a coordination control system, where the coordination control system includes a dc circuit breaker, a superconducting current limiter connected in series with the dc circuit breaker, and a dc power transmission grid system connected to the superconducting current limiter, and when the dc power transmission grid system fails, the superconducting current limiter and the dc circuit breaker can perform coordination control on the magnitude of a fault current, and since the resistance value of the superconducting current limiter is in a positive correlation with the magnitude of an ac/dc current, the fault current can be reduced through the superconducting current limiter under the condition that the dc power transmission grid system fails, that is, the requirement for the breaking current of the dc circuit breaker is reduced, thereby reducing the manufacturing requirement for the dc circuit breaker.
Referring to fig. 5, a flowchart of a coordinated control method for a superconducting current limiter and a dc circuit breaker according to another exemplary embodiment of the present disclosure is shown, where this embodiment is exemplified by using this method in the coordinated control system shown in fig. 1 or fig. 2. The method comprises the following steps.
The direct current control system acquires alternating current and direct current power grid data in real time or at preset time intervals.
The preset time interval may be set by default or may be set by self-definition, which is not limited by the embodiment of the disclosure.
The ac/dc grid data may include dc current and/or dc voltage. The direct current is the direct current in the direct current transmission power grid system.
The ac/dc grid data may also include plant operating status information. The direct current control system collects the running state information of the power plant through the alternating current power grid stability system, and the running state information of the power plant is used for indicating the running conditions of power plants around the converter station.
The AC/DC power grid data includes power plant operating state information. And the direct current control system determines the operation mode of the superconducting current limiter according to the operation state information of the power plant.
The operation modes of the superconducting current limiter comprise three operation modes, namely a resistor series operation mode, a resistor parallel operation mode and a single-resistor operation mode. For the description of the three operation modes, reference may be made to the details in the above embodiments, which are not repeated herein.
In one possible implementation manner, when the power plant operation state information is used for indicating that the alternating current is smaller than a preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is a resistance parallel operation mode or a single-resistance operation mode; when the power plant operation state information is used for indicating that the alternating current is larger than or equal to the preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is a resistor series operation mode.
Optionally, the direct current control system judges the current alternating current power grid strong and weak state according to the power plant operation state information, the alternating current power grid strong and weak state is used for indicating the alternating current power grid to enter a strong system or a weak system, and whether the alternating current and the direct current are smaller than a preset current threshold value is determined according to the alternating current power grid strong and weak state, so that the operation mode of the superconducting current limiter is determined.
Illustratively, the current operation mode of the superconducting current limiter is a resistance series operation mode, when the alternating current power grid is in a strong and weak state for indicating that the alternating current power grid enters a weak system, namely the alternating current is smaller than a preset current threshold, the direct current control system controls a related knife switch of the superconducting current limiter to perform switching-off and/or switching-on, and the operation mode of the superconducting current limiter is switched from the resistance series operation mode to a resistance parallel operation mode or a single resistance operation mode.
Illustratively, the operation mode of the superconducting current limiter is a resistance parallel operation mode or a single-resistor operation mode, when the alternating current power grid is in a strong state and a weak state, which indicates that the alternating current power grid enters a strong system, that is, the alternating current is greater than or equal to a preset current threshold, the direct current control system controls a related knife switch of the superconducting current limiter to perform switching-off and/or switching-on, and the operation mode of the superconducting current limiter is switched from the resistance parallel operation mode or the single-resistor operation mode to the resistance series operation mode.
The direct current control system transmits the operation mode of the superconducting current limiter to the direct current protection system. Correspondingly, the direct current protection system receives the operation mode of the superconducting current limiter.
And step 504, the direct current protection system determines the over-current protection fixed value of the superconducting current limiter according to the operation mode of the superconducting current limiter.
In a possible implementation manner, the dc protection system obtains the overcurrent protection constant value of the superconducting current limiter corresponding to the operation mode of the superconducting current limiter according to the preset corresponding relationship. The preset corresponding relation comprises a preset corresponding relation between the operation mode of the superconducting current limiter and the overcurrent protection fixed value of the superconducting current limiter.
The over-current protection fixed value of the superconducting current limiter is the over-current protection fixed value of the superconducting current limiter body. The over-current protection constant value of the superconducting current limiter can be switched according to the operation mode of the superconducting current limiter.
Optionally, the operation modes of the superconducting current limiter include three operation modes, and the overcurrent protection setting values of the superconducting current limiter corresponding to the three operation modes are different. Illustratively, the overcurrent protection fixed value of the superconducting current limiter corresponding to the resistor series operation mode is smaller than the overcurrent protection fixed value of the superconducting current limiter corresponding to the resistor parallel operation mode.
And 505, judging whether the direct current transmission power grid system has a fault by the direct current protection system.
Optionally, the ac/dc power grid data includes a dc current, and the dc protection system determines whether the dc current satisfies a preset fault condition. If the direct-current power grid data meet the preset fault condition, determining that the direct-current power transmission power grid system has a fault, and executing step 506; if the dc power grid data does not satisfy the preset fault condition, it is determined that the dc power transmission grid system has no fault, and step 501 is continuously executed.
The preset fault condition comprises that the direct current is larger than the over-current protection fixed value of the superconducting current limiter.
Optionally, when the dc current satisfies a preset fault condition, the dc protection system closes the bypass switch of the superconducting current limiter, and transmits fault information to the dc control system. The fault information is used for indicating the fault occurrence position.
It should be noted that, when the dc current satisfies the preset fault condition, the dc current at this time is the fault current.
And step 507, the direct current control system switches on and off the direct current breaker according to the fault information.
Optionally, the dc control system opens and closes the corresponding dc circuit breaker according to the fault occurrence position indicated by the fault information.
And step 508, after the direct current breaker is switched on and off, the direct current control system closes a bypass switch of the superconducting current limiter, and the bypass switch of the superconducting current limiter is used for shunting protection on the superconducting current limiter.
And at the target moment after the direct current breaker is opened and closed, the direct current control system closes the bypass switch of the superconducting current limiter, and the bypass switch of the superconducting current limiter is connected in parallel to the superconducting current limiter.
And the absolute value of the difference value between the target moment and the on-off moment of the direct current breaker is a preset time interval. The preset time interval is set by default or is set by self-definition. The embodiments of the present disclosure do not limit this.
Optionally, in order to ensure that the superconducting current limiter does not affect the stable operation of the dc transmission grid, when a non-electrical fault occurs in the superconducting current limiter, the dc control system closes the bypass switch of the superconducting current limiter.
In an illustrative example, a direct current control system collects power plant operation state information, an operation mode of a superconducting current limiter is determined according to the power plant operation state information, a direct current protection system switches an overcurrent protection fixed value of the superconducting current limiter according to the operation mode of the superconducting current limiter, the direct current protection system judges whether a direct current transmission power grid system fails or not by collecting related information (such as direct current) of alternating current and direct current power grid data, when the direct current transmission power grid system fails, the direct current protection system transmits the failure information to the direct current control system, the direct current control system rapidly controls a direct current breaker to be turned on or turned off according to different failure points, direct current line failure current can be restrained through the superconducting current limiter, and the direct current breaker is turned on or turned off conveniently. After the direct current breaker is switched on and off, the direct current protection system quickly closes a bypass switch of the superconducting current limiter according to the fault current of the superconducting current limiter, and the superconducting current limiter is protected from overcurrent.
In summary, the embodiment of the present disclosure further controls the bypass time of the superconducting current limiter through an effective timing sequence in cooperation with the dc control system according to the fault information transmitted by the dc protection system, so as to effectively control the fault current of the dc transmission power grid, and reduce the manufacturing requirements of the dc circuit breaker and the superconducting current limiter.
The embodiment of the disclosure also connects the bypass switch in parallel through the superconducting current limiter, so as to prevent the fault current flowing through the superconducting current limiter from being too large, and shunt protection is performed by quickly closing the bypass switch of the superconducting current limiter after the fault occurs, thereby reducing the manufacturing requirement on the superconducting current limiter.
The embodiment of the disclosure also quickly bypasses the superconducting current limiter, namely quickly closes the bypass switch of the superconducting current limiter when the superconducting current limiter body is in non-electric quantity fault through the direct current control system, protects the superconducting current limiter body and is beneficial to the stable operation of a direct current transmission power grid.
The following are embodiments of the apparatus of the embodiments of the present disclosure, and for portions of the embodiments of the apparatus not described in detail, reference may be made to technical details disclosed in the above-mentioned method embodiments.
Referring to fig. 6, a schematic structural diagram of a coordination control system according to another exemplary embodiment of the present disclosure is shown. The coordinated control system includes: a dc breaker 61, a superconducting current limiter 62 connected in series with the dc breaker 61 and a dc transmission grid system 63 connected to the superconducting current limiter 62,
when the direct-current transmission power grid system 63 has a fault, the superconducting current limiter 61 and the direct-current circuit breaker 62 are used for performing coordination control on the magnitude of the fault current, and the resistance value of the superconducting current limiter 61 is in positive correlation with the magnitude of the alternating current and the direct current.
Optionally, the coordination control system further comprises a dc protection system and a dc control system, the dc control system is respectively connected to the dc protection system, the dc breaker 61 and the superconducting current limiter 62, the dc protection system is connected to the superconducting current limiter 62,
when the direct-current power transmission grid system 63 has a fault, the direct-current protection system is used for transmitting fault information to the direct-current control system, and the fault information is used for indicating the position of the fault;
the direct current control system is used for switching on and switching off the direct current breaker 61 according to the fault information;
after the dc breaker 61 is opened, the dc control system is configured to close the bypass switch of the superconducting current limiter 62, and the bypass switch of the superconducting current limiter 62 is configured to perform shunt protection on the superconducting current limiter 62.
Optionally, when the dc current satisfies a preset fault condition, the dc protection system is configured to close the bypass switch of the superconducting current limiter 62, and transmit fault information to the dc control system;
the preset fault condition comprises that the direct current is larger than the over-current protection fixed value of the superconducting current limiter.
Optionally, the direct current control system is further configured to obtain power plant operation state information, where the power plant operation state information is used to indicate operation conditions of power plants around the converter station;
the direct current control system is further used for determining an operation mode of the superconducting current limiter 62 according to the power plant operation state information, wherein the operation mode comprises one of a resistor series operation mode, a resistor parallel operation mode and a single resistor operation mode;
the dc control system is also used to transmit the operating mode of superconducting current limiter 62 to the dc protection system;
the dc protection system is also used to determine the superconducting current limiter overcurrent protection setting based on the operating mode of the superconducting current limiter 62.
Optionally, when the plant operating state information is used to indicate that the ac current is less than the preset current threshold, the dc control system is further configured to determine that the operating mode of the superconducting current limiter 62 is a resistance parallel operating mode or a single-resistance operating mode;
when the plant operating condition information is used to indicate that the ac current is greater than or equal to the predetermined current threshold, the dc control system is further configured to determine the operating mode of the superconducting current limiter 62 as a resistive series operating mode.
Optionally, the dc protection system is further configured to obtain an overcurrent protection fixed value of the superconducting current limiter corresponding to the operation mode of the superconducting current limiter 62 according to a preset corresponding relationship; the preset correspondence includes a correspondence between a preset operation mode of the superconducting current limiter 62 and an overcurrent protection constant value of the superconducting current limiter.
Optionally, the dc control system is also used to close a bypass switch of superconducting current limiter 62 when a non-electrical fault occurs in superconducting current limiter 62.
With regard to the apparatus in the above-described embodiments, the specific manner in which each device performs the operations has been described in detail in the embodiments related to the method, and will not be described in detail here.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (7)
1. A method for coordinately controlling a superconducting current limiter and a DC circuit breaker, which is used in a coordinately controlled system, the coordinately controlled system comprising the DC circuit breaker, the superconducting current limiter connected in series with the DC circuit breaker, and a DC power transmission grid system connected to the superconducting current limiter, the method comprising:
when the direct current transmission power grid system has a fault, the superconducting current limiter and the direct current breaker carry out coordination control on the magnitude of fault current, and the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current;
the coordination control system also comprises a direct current protection system and a direct current control system;
when the direct current transmission power grid system has a fault, before the superconducting current limiter and the direct current breaker perform coordination control on the magnitude of the fault current, the method further comprises the following steps:
the direct current control system acquires the running state information of the power plant, determines the running mode of the superconducting current limiter according to the running state information of the power plant,
the direct current control system transmits the operation mode of the superconducting current limiter to the direct current protection system;
the direct current protection system determines the over-current protection constant value of the superconducting current limiter according to the operation mode of the superconducting current limiter;
the direct current protection system determines the over-current protection constant value of the superconducting current limiter according to the operation mode of the superconducting current limiter; the method comprises the following steps:
the direct current protection system acquires an over-current protection fixed value of the superconducting current limiter corresponding to the operation mode of the superconducting current limiter according to a preset corresponding relation;
the preset corresponding relation comprises a preset corresponding relation between the operation mode of the superconducting current limiter and the overcurrent protection fixed value of the superconducting current limiter.
2. The method according to claim 1, wherein the dc control system is respectively connected to the dc protection system, the dc breaker and the superconducting current limiter, the dc protection system is connected to the superconducting current limiter, and the superconducting current limiter and the dc breaker perform coordinated control on magnitude of fault current when the dc power transmission grid system fails, comprising:
when the direct current transmission power grid system has a fault, the direct current protection system transmits fault information to the direct current control system, wherein the fault information is used for indicating the position of the fault;
the direct current control system switches on or off the direct current breaker according to the fault information;
after the direct current breaker is switched off, the direct current control system closes a bypass switch of the superconducting current limiter, and the bypass switch of the superconducting current limiter is used for shunting protection of the superconducting current limiter.
3. The method of claim 2, wherein the dc protection system transmitting fault information to the dc control system when the dc transmission grid system fails, comprising:
when the direct current meets a preset fault condition, the direct current protection system closes a bypass switch of the superconducting current limiter and transmits the fault information to the direct current control system;
wherein the preset fault condition comprises that the direct current is greater than an overcurrent protection fixed value of the superconducting current limiter.
4. The method of claim 3, wherein the plant operating status information is indicative of operating conditions of the plants surrounding the converter station;
the operating mode includes one of a resistor series operating mode, a resistor parallel operating mode, and a single resistor operating mode.
5. The method of claim 4, wherein the determining the operating mode of the superconducting current limiter by the DC control system based on the plant operating condition information comprises:
when the power plant operation state information is used for indicating that the alternating current is smaller than a preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is the resistance parallel operation mode or the single resistance operation mode;
and when the power plant operation state information is used for indicating that the alternating current is greater than or equal to a preset current threshold, the direct current control system determines that the operation mode of the superconducting current limiter is the resistor series operation mode.
6. The method of any of claims 1 to 5, further comprising:
when a non-electrical fault occurs in the superconducting current limiter, the direct current control system closes a bypass switch of the superconducting current limiter.
7. A coordinated control system, characterized in that the coordinated control system comprises a DC breaker, a superconducting current limiter connected in series with the DC breaker and a DC transmission power grid system connected with the superconducting current limiter,
when the direct current transmission power grid system has a fault, the superconducting current limiter and the direct current breaker are used for performing coordination control on the magnitude of fault current, and the resistance value of the superconducting current limiter is in positive correlation with the magnitude of alternating current and direct current;
the coordination control system also comprises a direct current protection system and a direct current control system;
when the direct current transmission power grid system has a fault, before the superconducting current limiter and the direct current breaker perform coordination control on the magnitude of the fault current, the method further comprises the following steps:
the direct current control system acquires the running state information of the power plant, determines the running mode of the superconducting current limiter according to the running state information of the power plant,
the direct current control system transmits the operation mode of the superconducting current limiter to the direct current protection system;
the direct current protection system determines the over-current protection constant value of the superconducting current limiter according to the operation mode of the superconducting current limiter;
the direct current protection system determines the over-current protection constant value of the superconducting current limiter according to the operation mode of the superconducting current limiter; the method comprises the following steps:
the direct current protection system acquires an over-current protection fixed value of the superconducting current limiter corresponding to the operation mode of the superconducting current limiter according to a preset corresponding relation;
the preset corresponding relation comprises a preset corresponding relation between the operation mode of the superconducting current limiter and the overcurrent protection fixed value of the superconducting current limiter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561984.6A CN111600286B (en) | 2020-06-18 | 2020-06-18 | Coordination control method for superconducting current limiter and direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561984.6A CN111600286B (en) | 2020-06-18 | 2020-06-18 | Coordination control method for superconducting current limiter and direct current breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111600286A CN111600286A (en) | 2020-08-28 |
| CN111600286B true CN111600286B (en) | 2022-04-19 |
Family
ID=72190252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010561984.6A Active CN111600286B (en) | 2020-06-18 | 2020-06-18 | Coordination control method for superconducting current limiter and direct current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111600286B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01126133A (en) * | 1987-11-09 | 1989-05-18 | Toshiba Corp | Short-circuit controlling superconductng apparatus |
| JP2007274744A (en) * | 2006-03-30 | 2007-10-18 | Toshiba Corp | Superconductive current limiting device, superconductive current limiting system and superconductive current limiting control method |
| KR20080007911A (en) * | 2006-07-18 | 2008-01-23 | 엘에스산전 주식회사 | Electric power supply stability apparatus |
| CN106451390A (en) * | 2016-11-15 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Resistor type superconductive current limiter with adjustable operation volume and current limiting resistance |
| CN107134762A (en) * | 2017-06-09 | 2017-09-05 | 西安交通大学 | A kind of based superconductive current limliting without arc dc circuit breaker and cutoff method |
| CN206498192U (en) * | 2017-02-27 | 2017-09-15 | 华中科技大学 | A kind of hybrid DC superconducting current limiter based on energy fast transfer |
| CN109659967A (en) * | 2018-12-28 | 2019-04-19 | 国网江苏省电力有限公司经济技术研究院 | Converter station containing resistive superconducting current limiter and dc circuit breaker and its DC Line Fault processing strategie |
| CN110098634A (en) * | 2019-02-25 | 2019-08-06 | 上海电机学院 | A kind of wind-electricity integration system with superconductive current limiter |
| CN110829396A (en) * | 2019-11-18 | 2020-02-21 | 武汉大学 | Hybrid direct-current transmission fault processing system and method based on current limiter and circuit breaker |
| CN110970880A (en) * | 2019-12-10 | 2020-04-07 | 国网江苏省电力有限公司经济技术研究院 | Converter station containing RL type superconducting current limiter and DC circuit breaker and DC fault processing strategy thereof |
| CN111276951A (en) * | 2020-03-11 | 2020-06-12 | 广东电网有限责任公司电力科学研究院 | Direct current protection method, system and equipment based on superconducting current limiter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546908B (en) * | 2008-03-28 | 2011-09-21 | 北京云电英纳超导电缆有限公司 | Saturated iron core type superconducting current limiter with direct current control system and method for controlling same |
| CN109390964A (en) * | 2018-11-28 | 2019-02-26 | 国网江苏省电力有限公司经济技术研究院 | Multiterminal flexible direct current system containing inductive type superconductive current limiter and dc circuit breaker |
-
2020
- 2020-06-18 CN CN202010561984.6A patent/CN111600286B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01126133A (en) * | 1987-11-09 | 1989-05-18 | Toshiba Corp | Short-circuit controlling superconductng apparatus |
| JP2007274744A (en) * | 2006-03-30 | 2007-10-18 | Toshiba Corp | Superconductive current limiting device, superconductive current limiting system and superconductive current limiting control method |
| KR20080007911A (en) * | 2006-07-18 | 2008-01-23 | 엘에스산전 주식회사 | Electric power supply stability apparatus |
| CN106451390A (en) * | 2016-11-15 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Resistor type superconductive current limiter with adjustable operation volume and current limiting resistance |
| CN206498192U (en) * | 2017-02-27 | 2017-09-15 | 华中科技大学 | A kind of hybrid DC superconducting current limiter based on energy fast transfer |
| CN107134762A (en) * | 2017-06-09 | 2017-09-05 | 西安交通大学 | A kind of based superconductive current limliting without arc dc circuit breaker and cutoff method |
| CN109659967A (en) * | 2018-12-28 | 2019-04-19 | 国网江苏省电力有限公司经济技术研究院 | Converter station containing resistive superconducting current limiter and dc circuit breaker and its DC Line Fault processing strategie |
| CN110098634A (en) * | 2019-02-25 | 2019-08-06 | 上海电机学院 | A kind of wind-electricity integration system with superconductive current limiter |
| CN110829396A (en) * | 2019-11-18 | 2020-02-21 | 武汉大学 | Hybrid direct-current transmission fault processing system and method based on current limiter and circuit breaker |
| CN110970880A (en) * | 2019-12-10 | 2020-04-07 | 国网江苏省电力有限公司经济技术研究院 | Converter station containing RL type superconducting current limiter and DC circuit breaker and DC fault processing strategy thereof |
| CN111276951A (en) * | 2020-03-11 | 2020-06-12 | 广东电网有限责任公司电力科学研究院 | Direct current protection method, system and equipment based on superconducting current limiter |
Non-Patent Citations (1)
| Title |
|---|
| 直流混合型断路器与直流故障限流器的匹配研究;张翀;《电工电能新技术》;20160923;第35卷(第9期);第21-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111600286A (en) | 2020-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0482767B1 (en) | Fault detection arrangement | |
| AU695361B2 (en) | Digitally controlled circuit interrupter with improved automatic selection of sampling interval for 50 hz and 60 hz power systems | |
| RU2323511C1 (en) | Automatic reclosing device in particular for controlling zero-sequence current of switches | |
| CN107147092B (en) | One and half main electrical scheme substation line stoppage circuit breaker failure protection implementation methods | |
| US20130229739A1 (en) | Voltage balancing of symmetric hvdc monopole transmission lines after earth faults | |
| CN105493218A (en) | Circuit breaker with hybrid switch | |
| CN109449895B (en) | Distributed self-healing control method suitable for breaker load switch hybrid power distribution network | |
| CN109245072B (en) | Self-adaptive in-situ feeder automation fault processing method based on regional sequence number | |
| CN207588442U (en) | A kind of operation control circuit of breaker | |
| CN106786473A (en) | A kind of arc suppression coil earthing system distribution line single-phase earth fault isolation method | |
| CN105529681A (en) | Leakage protection circuit for low-voltage ungrounded system and realization method | |
| CN111600286B (en) | Coordination control method for superconducting current limiter and direct current breaker | |
| CN111817281B (en) | Switching control system and method for arc suppression coil parallel low-resistance grounding device | |
| CN210608530U (en) | Arc suppression cabinet and small current grounding system | |
| CN209994100U (en) | Electronic switch with soft start and protection functions for direct current power distribution system | |
| CN209994103U (en) | Hybrid switch with soft start and protection functions for DC power distribution system | |
| CN210092867U (en) | Converter station auxiliary device and converter station | |
| CN109962448B (en) | Short-circuit current absorption branch input control method and device based on voltage characteristics | |
| CN110445116B (en) | Drain control circuit and device | |
| JP3227653B2 (en) | Power system protection controller | |
| CN107192919B (en) | Power distribution network feed line protection device and method with self-identification grounding mode | |
| CN214314526U (en) | Leakage protection device | |
| CN206806991U (en) | A kind of power distribution network busbar protective device of earthing mode self-identifying | |
| CN206850414U (en) | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices | |
| JPH11289670A (en) | Two-pole dc power transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |