CN110661240A - Opening control method and related device of hybrid high-voltage direct-current circuit breaker - Google Patents
Opening control method and related device of hybrid high-voltage direct-current circuit breaker Download PDFInfo
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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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Abstract
The embodiment of the invention provides a brake-separating control method, a brake-separating control device, a readable storage medium and a controller of a hybrid high-voltage direct-current circuit breaker, and belongs to the field of flexible direct-current transmission of a power system, wherein the method comprises the steps of executing pre-brake separation after line traveling wave protection is started, namely transferring main branch current to a transfer branch; and after the line traveling wave protection action, switching off is executed, and the current of the transfer branch is transferred to the energy consumption branch. By executing pre-opening before the line traveling wave protection action, the time from the fault occurrence to the completion of opening of the hybrid high-voltage direct-current circuit breaker is shortened, and the fault is isolated in time.
Description
Technical Field
The invention relates to the field of flexible direct current transmission of a power system, in particular to a brake-opening control method and device of a hybrid high-voltage direct current circuit breaker, a readable storage medium and a controller.
Background
The flexible direct current transmission technology has the characteristics of fast and independent control of active power and reactive power, independence of an alternating current system to provide commutation current, capability of supplying power to a passive network, no need of installing a filter and the like, and is an important development direction of direct current transmission. The key equipment of the flexible direct current transmission system networking is a high-voltage direct current circuit breaker, when a direct current line breaks down, the high-voltage direct current circuit breaker is used for quickly isolating the fault, and the converter valve is prevented from being locked, so that other lines can be ensured to continuously transmit power. When a direct current line has a fault, the fault current rises rapidly, and in order to prevent the converter valve from being locked and realize fault ride-through of the direct current line, the fault must be removed within millisecond-level time, so that the high-voltage direct current circuit breaker is required to be closely matched with line protection.
The hybrid high-voltage dc circuit breaker is shown in fig. 1 and includes a main branch, a transfer branch and an energy consumption branch. The main branch comprises a mechanical switch and a power electronic switch; the transfer branch comprises a power electronic switch. When the hybrid high-voltage direct-current circuit breaker is in a switching-on state, the main branch is in through-flow. The opening process of the hybrid high-voltage direct-current circuit breaker comprises the steps of controlling the power electronic switch of the transfer branch circuit to be switched on, controlling the power electronic switch of the main branch circuit to be switched off, and controlling the mechanical switch of the main branch circuit to be switched off after the current of the main branch circuit is completely transferred to the transfer branch circuit; and then controlling the power electronic switch of the transfer branch circuit to be switched off, so that the current is transferred from the transfer branch circuit to the energy consumption branch circuit, and completing the brake opening. In the prior art, the time from the occurrence of a fault to the completion of the opening of the hybrid high-voltage direct-current circuit breaker is long.
Disclosure of Invention
In view of the above, the present invention provides a method, an apparatus, a readable storage medium and a controller for controlling opening of a hybrid high voltage dc circuit breaker, which are intended to shorten a time from a failure occurrence to completion of opening of the hybrid high voltage dc circuit breaker and to isolate the failure in time.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, an embodiment of the present invention provides a method for controlling opening of a hybrid high-voltage dc circuit breaker, including:
judging whether to start line traveling wave protection, if so, starting timing;
judging whether the timing time is greater than the preset protection delay time, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and judging whether to perform line traveling wave protection action, if so, controlling the mechanical switch of the main branch to be switched off, and controlling the power electronic switch of the transfer branch to be switched off.
Optionally, if the result of judging whether to perform the line traveling wave protection action is all within the preset time, the power electronic switch of the transfer branch is controlled to be turned off, and the power electronic switch of the main branch is controlled to be turned on.
Optionally, the determining whether to start the line traveling wave protection process specifically includes:
calculating to obtain a first reference value according to a first reference value formula, wherein the first reference value formula is
Pdif＝0.5×Zdif×(IDL1-IDL2)-0.5×(UDL1-UDL2)
Wherein, PdifIs a first reference value, IDL1Is the current of the positive line, IDL2Current of negative polarity line, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZdifIs a preset first constant value;
and judging whether the first reference value is larger than a preset first threshold value or not, and if so, determining to start line traveling wave protection.
Optionally, before the determining to start the line traveling wave protection, the method further includes:
deriving the first reference value to obtain a first parameter change rate;
and judging whether the first parameter change rate is greater than a preset second threshold value, and if so, determining to start line traveling wave protection.
Optionally, the process of determining whether to perform the line traveling wave protection action specifically includes:
calculating to obtain a second reference value according to a second reference value formula
Qcom＝0.5×Zcom×(IDL1+IDL2)-0.5×(UDL1+UDL2)
Wherein Q iscomIs a second reference value, IDL1Is the current of the positive line, IDL2Current of negative polarity line, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZcomIs a preset second constant value;
and judging whether the second reference value is larger than a preset third threshold value, and if so, determining to perform line traveling wave protection action.
Optionally, before the determining to perform the line traveling wave protection action, the method further includes:
deriving the second reference value to obtain a second parameter change rate;
and judging whether the second parameter change rate is greater than a preset fourth threshold value, and if so, determining to perform line traveling wave protection action.
In a second aspect, an embodiment of the present invention provides an opening control device for a hybrid high-voltage dc circuit breaker, including:
the first judgment unit is used for judging whether to start line traveling wave protection, and if so, timing is started;
the second judgment unit is used for judging whether the timing time is greater than the preset protection delay time or not, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and the third judgment unit is used for judging whether to perform line traveling wave protection action, and if so, the third judgment unit controls the mechanical switch of the main branch circuit to be switched off and controls the power electronic switch of the transfer branch circuit to be switched off.
Optionally, the third determining unit is further configured to, if the result of determining whether to perform the line traveling wave protection action is all within a preset time, control the power electronic switch of the transfer branch to be turned off, and control the power electronic switch of the main branch to be turned on.
In a third aspect, an embodiment of the present invention provides a readable storage medium, on which a program is stored, and when the program is executed by a processor, the program implements the steps of any one of the brake opening control methods provided in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a controller, including a memory and a processor, the memory storing a program; the processor is configured to execute the program to implement the steps of any one of the switching control methods provided in the first aspect.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the brake-separating control method of the hybrid high-voltage direct-current circuit breaker, after line traveling wave protection is started, pre-brake separation is executed, namely, main branch circuit current is transferred to a transfer branch circuit; and after the line traveling wave protection action, switching off is executed, and the current of the transfer branch is transferred to the energy consumption branch. By executing pre-opening before the line traveling wave protection action, the time from the fault occurrence to the completion of opening of the hybrid high-voltage direct-current circuit breaker is shortened, and the fault is isolated in time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a hybrid high voltage dc circuit breaker;
fig. 2 is a schematic diagram of a switching-off process of a hybrid high-voltage direct-current circuit breaker in the prior art;
fig. 3 is a schematic diagram of a switching-off process of the hybrid high-voltage direct-current circuit breaker provided by the invention;
fig. 4 is a flowchart of a switching-off control method for a hybrid high-voltage dc circuit breaker according to an embodiment of the present invention;
fig. 5 is a schematic logical structure diagram of an opening control device of a hybrid high-voltage dc circuit breaker according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, the opening process of the hybrid high-voltage direct-current circuit breaker is started after the line traveling wave protection action, as shown in fig. 2. In the figure, the first commutation refers to the transfer of the main branch current to the transfer branch, and the second commutation refers to the transfer of the transfer branch current to the energy-consuming branch. The whole process takes a long time. The core idea of the present invention is to perform pre-breaking after line traveling wave protection is started, i.e. to transfer the main branch current to the transfer branch, as shown in fig. 3. By executing pre-opening before the line traveling wave protection action, the time from the fault occurrence to the completion of opening of the hybrid high-voltage direct-current circuit breaker is shortened, and the fault is isolated in time.
Referring to fig. 4, a flowchart of a switching-off control method of a hybrid high-voltage dc circuit breaker is provided for an embodiment of the present invention. The opening control method can comprise the following steps:
s41: judging whether to start line traveling wave protection, if so, starting timing;
s42: and judging whether the timing time is greater than the preset protection delay time, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off.
And the power electronic switch of the transfer branch is controlled to be switched on, the power electronic switch of the main branch is controlled to be switched off, and the main branch current is transferred to the transfer branch, so that pre-brake is realized.
S43: and judging whether to perform line traveling wave protection action, if so, controlling the mechanical switch of the main branch to be switched off, and controlling the power electronic switch of the transfer branch to be switched off.
And the mechanical switch of the main branch circuit is controlled to be switched off, the power electronic switch of the transfer branch circuit is controlled to be switched off, the current of the transfer branch circuit is transferred to the energy consumption branch circuit, and the brake separation is completed.
In a specific embodiment, after pre-opening, whether a line traveling wave protection action is performed or not is judged in real time, if yes occurs in a period of time, a mechanical switch of a main branch is controlled to be switched off, a power electronic switch of a transfer branch is controlled to be switched off, and current of the transfer branch is transferred to an energy consumption branch; and if the judgment result is negative within a period of time, controlling the power electronic switch of the transfer branch circuit to be switched off, and controlling the power electronic switch of the main branch circuit to be switched on, namely controlling the hybrid high-voltage direct-current circuit breaker to recover to a switch-on state.
The inventor finds that when a direct current line has a fault, transient current traveling waves and voltage traveling waves which are propagated at a speed close to the speed of light are generated from a fault point, so that the fault information is rich, and the traveling wave fault component can be utilized to form ultra-high-speed traveling wave protection. Next, the process of determining whether to start the line traveling wave protection according to the traveling wave fault component is described.
A11: according to the first reference value formula, calculating to obtain a first reference value Pdif。
The first reference value is expressed as Pdif＝0.5×Zdif×(IDL1-IDL2)-0.5×(UDL1-UDL2) Wherein P isdifIs a first reference value, IDL1Is the current of the positive line, IDL2Current of negative polarity line, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZdifIs a preset first constant value. ZdifAre constant values related to the resistance, inductance, capacitance and conductance per unit length of the dc link.
A12: judging the first reference value PdifAnd whether the current is greater than a preset first threshold value delta 1 or not, and if so, determining to start the line traveling wave protection.
In order to improve the reliability of the traveling wave protection, the first reference value P can also be determined before the line traveling wave protection is starteddifObtaining the first parameter change rate dP by derivationdifDt and determining the rate of change dP of the first parameterdifAnd judging whether the/dt is larger than a preset second threshold value delta 2, and if so, determining to start the line traveling wave protection. I.e. at PdifIs > Delta 1 and dPdifWhen the/dt is larger than delta 2, the line travelling wave protection is determined to be started.
According to the travelling wave fault component, the process of judging whether to carry out the line travelling wave protection action specifically comprises the following steps:
a21: calculating to obtain a second reference value Q according to a second reference value formulacom。
The second reference value is expressed as Qcom＝0.5×Zcom×(IDL1+IDL2)-0.5×(UDL1+UDL2) Wherein Q iscomIs a second reference value, IDL1Is the current of the positive line, IDL2Electricity being negative pole lineFlow, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZcomIs a preset second constant value. ZcomAnd are also constant values related to the resistance, inductance, capacitance and conductance per unit length of the dc link.
A22: judging the second reference value QcomAnd if the current value is larger than a preset third threshold value delta 3, determining to perform line traveling wave protection action.
In order to improve the reliability of the traveling wave protection, the second reference value Q may be set before the line traveling wave protection action is determinedcomDerivation is carried out to obtain the second parameter change rate dQcomDt and determining the rate of change of the second parameter dQcomAnd if the/dt is larger than a preset fourth threshold value delta 4, determining to perform line traveling wave protection action. I.e. at Qcom> Δ 3 and dQcomAnd the/dt is more than delta 4, the line traveling wave protection action is determined.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention.
The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.
Referring to fig. 5, a schematic logical structure of an opening control device of a hybrid high-voltage dc circuit breaker according to an embodiment of the present invention is provided. This separating brake controlling means includes: a first judging unit 51, a second judging unit 52 and a third judging unit 53.
A first judging unit 51, configured to judge whether to start line traveling wave protection, and if yes, start timing;
the second judging unit 52 is configured to judge whether the timing time is greater than a preset protection delay time, and if so, control the power electronic switch of the transfer branch to be turned on, and control the power electronic switch of the main branch to be turned off;
and a third determining unit 53, configured to determine whether to perform a line traveling wave protection operation, and if so, control the mechanical switch of the main branch to be turned off, and control the power electronic switch of the transfer branch to be turned off.
Optionally, the third determining unit is further configured to, if the results of determining whether to perform the line traveling wave protection operation are all within a preset time, control the power electronic switch of the transfer branch to be turned off, and control the power electronic switch of the main branch to be turned on.
The opening control method provided by the embodiment of the invention can be applied to a controller. Fig. 6 is a schematic diagram of a controller according to a preferred embodiment of the present invention. The hardware structure of the controller may include: at least one processor 61, at least one communication interface 62, at least one memory 63 and at least one communication bus 64; and the processor 61, the communication interface 62 and the memory 63 are communicated with each other through a communication bus 64.
The communication interface 62 may include a standard wired interface, a wireless interface (e.g., WI-FI interface). Are commonly used to establish communication connections between the controller and other electronic devices or systems.
The memory 63 includes at least one type of readable storage medium. The readable storage medium may be an NVM (non-volatile memory) such as flash memory, hard disk, multimedia card, card-type memory, etc. The readable storage medium may also be a Random Access Memory (RAM) memory
Wherein the memory 63 stores a computer program, and the processor 61 may call the computer program stored in the memory 63, the computer program being configured to:
judging whether to start line traveling wave protection, if so, starting timing;
judging whether the timing time is greater than the preset protection delay time, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and judging whether to perform line traveling wave protection action, if so, controlling the mechanical switch of the main branch to be switched off, and controlling the power electronic switch of the transfer branch to be switched off.
The refinement function and the extension function of the program may be referred to as described above.
FIG. 6 only shows a controller having components 61-64, but it is understood that not all of the shown components are required and that more or fewer components may alternatively be implemented.
An embodiment of the present invention further provides a readable storage medium, where the readable storage medium may store a program adapted to be executed by a processor, where the program is configured to:
judging whether to start line traveling wave protection, if so, starting timing;
judging whether the timing time is greater than the preset protection delay time, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and judging whether to perform line traveling wave protection action, if so, controlling the mechanical switch of the main branch to be switched off, and controlling the power electronic switch of the transfer branch to be switched off.
The refinement function and the extension function of the program may be referred to as described above.
The above-described embodiments of the apparatus are merely illustrative, and 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 place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A brake-separating control method of a hybrid high-voltage direct-current circuit breaker is characterized by comprising the following steps:
judging whether to start line traveling wave protection, if so, starting timing;
judging whether the timing time is greater than the preset protection delay time, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and judging whether to perform line traveling wave protection action, if so, controlling the mechanical switch of the main branch to be switched off, and controlling the power electronic switch of the transfer branch to be switched off.
2. The opening control method according to claim 1, wherein if the results of the determination of whether to perform the line traveling wave protection operation are all within a preset time, the power electronic switch of the branch is controlled to be turned off, and the power electronic switch of the main branch is controlled to be turned on.
3. The opening control method according to claim 1, wherein the determining whether to start the line traveling wave protection process specifically includes:
calculating to obtain a first reference value according to a first reference value formula, wherein the first reference value formula is
Pdif＝0.5×Zdif×(IDL1-IDL2)-0.5×(UDL1-UDL2)
Wherein, PdifIs a first reference value, IDL1Is the current of the positive line, IDL2Current of negative polarity line, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZdifIs a preset first constant value;
and judging whether the first reference value is larger than a preset first threshold value or not, and if so, determining to start line traveling wave protection.
4. The opening control method according to claim 3, further comprising, before said determining to turn on line traveling wave protection:
deriving the first reference value to obtain a first parameter change rate;
and judging whether the first parameter change rate is greater than a preset second threshold value, and if so, determining to start line traveling wave protection.
5. The opening control method according to claim 1, wherein the process of determining whether to perform the line traveling wave protection action specifically includes:
calculating to obtain a second reference value according to a second reference value formula
Qcom＝0.5×Zcom×(IDL1+IDL2)-0.5×(UDL1+UDL2)
Wherein Q iscomIs a second reference value, IDL1Is the current of the positive line, IDL2Current of negative polarity line, UDL1Is the voltage of the positive line, UDL2Voltage of negative polarity line, ZcomIs a preset second constant value;
and judging whether the second reference value is larger than a preset third threshold value, and if so, determining to perform line traveling wave protection action.
6. The opening control method according to claim 5, further comprising, before said determining to perform the line traveling wave protection action:
deriving the second reference value to obtain a second parameter change rate;
and judging whether the second parameter change rate is greater than a preset fourth threshold value, and if so, determining to perform line traveling wave protection action.
7. An opening control device of a hybrid high-voltage direct-current circuit breaker is characterized by comprising:
the first judgment unit is used for judging whether to start line traveling wave protection, and if so, timing is started;
the second judgment unit is used for judging whether the timing time is greater than the preset protection delay time or not, if so, controlling the power electronic switch of the transfer branch to be switched on, and controlling the power electronic switch of the main branch to be switched off;
and the third judgment unit is used for judging whether to perform line traveling wave protection action, and if so, the third judgment unit controls the mechanical switch of the main branch circuit to be switched off and controls the power electronic switch of the transfer branch circuit to be switched off.
8. The opening control device according to claim 7, wherein the third determining unit is further configured to control the power electronic switch of the branch line to be turned off and the power electronic switch of the main branch line to be turned on if the result of determining whether to perform the line traveling wave protection operation is all within a preset time.
9. A readable storage medium, on which a program is stored, wherein the program, when executed by a processor, implements the steps of the opening control method according to any one of claims 1 to 6.
10. A controller comprising a memory and a processor, the memory for storing a program; the processor is used for executing the program and realizing the steps of the opening control method according to any one of claims 1-6.
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| CN201910958564.9A CN110661240A (en) | 2019-10-10 | 2019-10-10 | Opening control method and related device of hybrid high-voltage direct-current circuit breaker |
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| CN201910958564.9A CN110661240A (en) | 2019-10-10 | 2019-10-10 | Opening control method and related device of hybrid high-voltage direct-current circuit breaker |
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| CN112130063A (en) * | 2020-08-28 | 2020-12-25 | 许继集团有限公司 | Detection and protection method for mechanical switch tripping of hybrid high-voltage direct-current circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112130063A (en) * | 2020-08-28 | 2020-12-25 | 许继集团有限公司 | Detection and protection method for mechanical switch tripping of hybrid high-voltage direct-current circuit breaker |
| CN112130063B (en) * | 2020-08-28 | 2024-04-12 | 许继集团有限公司 | Detection and protection method for mechanical switch theft jump of hybrid high-voltage direct-current breaker |
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Application publication date: 20200107 |