CN113595039B - Isolation control method, medium and system for faults of extra-high voltage converter station - Google Patents
Isolation control method, medium and system for faults of extra-high voltage converter station Download PDFInfo
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- CN113595039B CN113595039B CN202110633913.7A CN202110633913A CN113595039B CN 113595039 B CN113595039 B CN 113595039B CN 202110633913 A CN202110633913 A CN 202110633913A CN 113595039 B CN113595039 B CN 113595039B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses an isolation control method, medium and system for faults of an extra-high voltage converter station. The method comprises the following steps: judging the type of the current differential protection action triggered by the fault in the pole area of the extra-high voltage converter station; judging whether a direct current side wiring mode of a current converter area of a region where a fault is located is a quick circuit breaker wiring mode, wherein the quick circuit breaker wiring mode is as follows: for a converter region, a cathode breaker and a parallel breaker are sequentially connected in series between a cathode disconnecting link and a bypass disconnecting link, and an anode breaker is connected in series between the bypass disconnecting link and an anode disconnecting link; and determining an isolation control method of the fault of the extra-high voltage converter station according to the type of the current differential protection action of the region where the fault is located and the direct current side wiring mode of the converter region of the region where the fault is located. The invention realizes the accurate identification and the rapid isolation of the fault current converter, and the rapid restarting and the continuous live operation of the sound current converter, thereby improving the safety and the reliability of the integral operation of the extra-high voltage direct current.
Description
Technical Field
The invention relates to the technical field of fault isolation control of an extra-high voltage converter station, in particular to an isolation control method, medium and system for faults of the extra-high voltage converter station.
Background
Each pole of the extra-high voltage converter station is composed of two converters connected in series, and under the operation mode of a bipolar four-converter, a bipolar three-converter or a unipolar two-converter, as shown in fig. 1, the single converter breaks down to cause the differential protection action of the converters, and the cathode disconnecting link and the anode disconnecting link of the converters do not have the capability of rapidly extinguishing arc and breaking fault current, so that pole locking and pole isolation operations are required, and the high-jump and low-end converter incoming line circuit breakers isolate fault points. In addition, as shown in fig. 1, after the extremely differential protection action in the prior art, the pole locking, pole isolation, high jump and low-end converter incoming line breaker are also executed. Both of these conditions can result in monopolar shutdown and excessive power loss.
Disclosure of Invention
The embodiment of the invention provides an isolation control method, medium and system for an extra-high voltage converter station fault, which are used for solving the problems that an isolation control strategy in the prior art can cause monopole outage and excessive power loss when the extra-high voltage converter station is in fault.
In a first aspect, an isolation control method for faults of an extra-high voltage converter station is provided, including: judging the type of the current differential protection action triggered by the fault in one polar region of the extra-high voltage converter station, wherein the type of the differential protection action comprises at least one of the following steps: differential protection action of the high-side converter, differential protection action of the low-side converter and extremely differential protection action; judging whether a direct current side wiring mode of a current converter area of a region where a fault is located is a quick circuit breaker wiring mode, wherein the quick circuit breaker wiring mode is as follows: for a converter area, a cathode breaker and a parallel breaker are sequentially connected in series between a cathode disconnecting link and a bypass disconnecting link, and an anode breaker is connected in series between the bypass disconnecting link and an anode disconnecting link, wherein the cathode breaker, the parallel breaker and the anode breaker are all quick breakers; and determining an isolation control method of the fault of the extra-high voltage converter station according to the type of the current differential protection action of the region where the fault is located and a direct current side wiring mode of the converter region of the region where the fault is located.
In a second aspect, there is provided a computer readable storage medium having computer program instructions stored thereon; the computer program instructions, when executed by the processor, implement the method for isolating and controlling faults of the extra-high voltage converter station according to the embodiment of the first aspect.
In a third aspect, an isolation control system for faults of an extra-high voltage converter station is provided, including: a computer readable storage medium as in the second aspect embodiment described above.
In this way, the embodiment of the invention comprehensively considers the differential protection action results of the pole layer and the converter layer, adopts the fault converter isolation and sound converter restarting control logic taking the differential protection of the converter, the differential protection of the pole layer and the direct current side wiring mode of the converter area as the conditions, realizes the accurate identification and the quick isolation of the fault converter and the quick restarting and continuous live operation of the sound converter, improves the safety and the reliability of the integral operation of the extra-high voltage direct current, and avoids the expansion of the power failure range.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a differential and very differential protection strategy of a converter of a prior art extra-high voltage converter station;
fig. 2 is a flowchart of an isolation control method for an extra-high voltage converter station fault according to an embodiment of the present invention;
fig. 3 is a schematic circuit configuration of a pole 1 converter station according to a preferred embodiment of the present invention;
fig. 4 is a logic schematic diagram of an isolation control method for an extra-high voltage converter station fault according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the operation logic of the fast restart sound converter after a single converter failure according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses an isolation control method for faults of an extra-high voltage converter station. The extra-high voltage converter station comprises two converter stations on opposite sides of each other. One of the converter stations is a rectifying station, and the other converter station is an inverting station. Each converter station comprises two poles. Each pole comprises two inverter regions. One of the converter regions is a high-end converter region, and the other converter region is a low-end converter region.
As shown in fig. 2, the isolation control method for the fault of the extra-high voltage converter station according to the embodiment of the invention comprises the following steps:
step S1: and judging the type of the current differential protection action triggered by the fault in the pole area of the extra-high voltage converter station.
Wherein the type of differential protection action includes at least one of: differential protection operation of the high-side converter, differential protection operation of the low-side converter, and very differential protection operation.
Step S2: and judging whether the direct current side wiring mode of the current converter region of the region where the fault is located is a quick breaker wiring mode.
The quick circuit breaker wiring mode is as follows: for an inverter region, a cathode breaker and a parallel breaker are sequentially connected in series between a cathode knife switch and a bypass knife switch, and an anode breaker is connected in series between the bypass knife switch and an anode knife switch. The cathode circuit breaker, the parallel circuit breaker and the anode circuit breaker are all fast circuit breakers. The quick breaker is a breaker which is reliably switched off within 50ms and reliably switched on within 10 ms.
Fig. 3 shows a schematic circuit configuration of a pole 1 converter station according to a preferred embodiment of the present invention, which is a fast circuit breaker wiring scheme.
Specifically, one end of the high-end converter HC1 of the pole 1 converter station is connected to a first ac line breaker CB1 and a second ac line breaker CB2. The other end of the high-side converter HC1 is connected to the first thyristor assembly Thy1. It should be understood that the first thyristor assembly Thy1 includes a plurality of thyristors connected in series, and furthermore, each group of thyristors connected in series may be connected in parallel, and the specific connection structure of the first thyristor assembly Thy1 may be set according to practical situations. The cathode of the first thyristor assembly Thy1 is connected to one end of the first wall bushing TG 1. The other end of the first wall bushing TG1 is connected to one end of the first PLC reactor L1. The other end of the first PLC reactor L1 is connected with one end of a first cathode disconnecting link Q13. A first current transformer T1 is connected in series between the first PLC reactor L1 and the first cathode disconnecting link Q13 and is used for collecting high-voltage side current IDC1P of the pole 1 high-end converter. The anode of the first thyristor assembly Thy1 is connected to one end of the second wall bushing TG 2. The other end of the second wall bushing TG2 is connected to one end of the second PLC reactor L2. The other end of the second PLC reactor L2 is connected with one end of the first anode disconnecting link Q11. And a second current transformer T2 is connected in series between the second PLC reactor L2 and the first anode disconnecting link Q11 and is used for collecting the low-voltage side current IDC1N of the high-end converter of the pole 1. The first bypass breaker Q1 is connected in parallel to one end of the first cathode switch Q13 and one end of the first anode switch Q11. The other end of the first cathode disconnecting link Q13 is connected with one end of a first cathode breaker Q5, the other end of the first cathode breaker Q5 is connected with one end of a first parallel breaker Q4, and the other end of the first parallel breaker Q4 is connected with one end of a first bypass disconnecting link Q12. A first anode breaker Q3 is connected in series between the other end of the first anode switch Q11 and the other end of the first bypass switch Q12.
One end of the low-end converter LC2 of the pole 1 converter station is connected to a third ac line breaker CB3 and a fourth ac line breaker CB4. The other end of the low-side converter LC2 is connected to a second thyristor assembly Thy2. It should be appreciated that the second thyristor assembly Thy2 comprises a plurality of thyristors connected in series, and furthermore, each group of thyristors connected in series may be connected in parallel, and the specific connection structure of the second thyristor assembly Thy2 may be set according to practical situations. The cathode of the second thyristor Thy2 is connected to one end of the third wall bushing TG 3. The other end of the third wall bushing TG3 is connected to one end of the third PLC reactor L3. The other end of the third PLC reactor L3 is connected with one end of the second cathode knife switch Q14. And a third current transformer T3 is connected in series between the third PLC reactor L3 and the second cathode disconnecting link Q14 and is used for collecting the high-voltage side current IDC2P of the low-end converter of the pole 1. The anode of the second thyristor assembly Thy2 is connected to one end of the fourth wall bushing TG 4. The other end of the fourth wall bushing TG4 is connected to one end of the fourth PLC reactor L4. The other end of the fourth PLC reactor L4 is connected with one end of the second anode disconnecting link Q16. And a fourth current transformer T4 is connected in series between the fourth PLC reactor L4 and the second anode disconnecting link Q16 and is used for collecting the low-voltage side current IDC2N of the low-end converter of the pole 1. The second bypass breaker Q2 is connected in parallel to one end of the second cathode knife Q14 and one end of the second anode knife Q16. The other end of the second cathode disconnecting link Q14 is connected with one end of a second cathode breaker Q6, the other end of the second cathode breaker Q6 is connected with one end of a second parallel circuit breaker Q7, and the other end of the second parallel circuit breaker Q7 is connected with one end of a second bypass disconnecting link Q15. A second anode breaker Q8 is connected in series between the other end of the second anode disconnecting link Q16 and the other end of the second bypass disconnecting link Q15. The other end of the first bypass disconnecting link Q12 is connected with one end of a second parallel circuit breaker Q7.
In addition, the extra-high voltage converter station pole 1 region further includes: the DC filter Z, the pole 1 neutral bus breaker NBS, the pole bus disconnecting link Q17, the capacitor C and the lightning arrester F.
One end of a direct current filter Z is connected between the other end of the first cathode disconnecting link Q13 and one end of the pole bus disconnecting link Q17. The other end of the direct current filter Z is connected with the other end of the second anode disconnecting link Q16. A fifth current transformer T5 is connected in series with one end of the dc filter Z. The other end of the direct current filter Z is connected in series with a sixth current transformer T6.
The other end of the first cathode breaker Q5 (the other end of the first cathode breaker Q13 if a quick breaker is not installed) is connected to one end of the pole bus bar breaker Q17. A pole 1 pole busbar dc voltage divider U2 is connected between the other end of the first cathode breaker Q5 (if no fast breaker is installed, the other end of the first cathode disconnecting link Q13) and one end of the pole busbar disconnecting link Q17. The other end of the pole bus disconnecting link Q17 is connected in series with a seventh current transformer T7 for collecting the pole 1 pole bus current IDL.
The other end of the second bypass breaker Q15 (if a quick breaker is not installed, the other end of the second anode breaker Q16) is connected to one end of the pole 1 neutral bus breaker NBS. A pole 1 pole neutral bus direct current voltage divider U3 is connected between the other end of the second bypass disconnecting link Q15 (if a quick breaker is not installed, the other end of the second anode disconnecting link Q16) and one end of the pole 1 pole neutral bus breaker NBS; and an eighth current transformer T8 is connected in series. The other end of the pole 1 pole neutral bus breaker NBS is connected in series with a ninth current transformer T9 for collecting current IDNE of the side of the pole 1 pole neutral bus close to the grounding electrode.
One capacitor plate of the capacitor C is connected to one end of the pole 1 neutral bus breaker NBS, and the other capacitor plate of the capacitor C is grounded. The other capacitor plate of the capacitor C is connected in series with a tenth current transformer T10.
One end of the lightning arrester F is connected to one end of the pole 1 pole neutral bus breaker NBS, and the other end of the lightning arrester F is grounded. The other end of the lightning arrester F is connected with an eleventh current transformer T11 in series.
The circuit structure of the pole 1 converter station according to another preferred embodiment of the present invention is not a fast breaker wiring scheme, i.e., the circuit structure does not have a first anode breaker Q3, a first parallel breaker Q4, a first cathode breaker Q5, a second cathode breaker Q6, a second parallel breaker Q7, and a second anode breaker Q8. It should be appreciated that the first anode circuit breaker Q3, the first parallel circuit breaker Q4, the first cathode circuit breaker Q5, the second cathode circuit breaker Q6, the second parallel circuit breaker Q7, and the second anode circuit breaker Q8 are quick circuit breakers.
Step S3: and determining an isolation control method of the fault of the extra-high voltage converter station according to the type of the current differential protection action of the region where the fault is located and the direct current side wiring mode of the converter region of the region where the fault is located.
Specifically, the isolation control method is different according to different conditions, as shown in fig. 4 (in fig. 4, "o" indicates not, i.e. 1 is reversely taken to 0,0 is reversely taken to 1;t to indicate delay, and according to different conditions Kuang Yan, 50ms or 500ms is convenient for actual control operation), which is specifically as follows.
The first isolation control method comprises the following steps:
(1) If the type of the current differential protection action of the zone where the fault is located is the differential protection action of the high-end converter, determining that the fault type of the zone where the fault is located is the high-end converter fault.
(2) If the direct current side connection mode of the high-end current converter region of the fault is not the quick breaker connection mode, the alternating current incoming line breaker of the high-end current converter region of the fault is jumped, pole locking and pole isolation operation of the region where the fault is located is executed, and after the high-end current converter of the fault is isolated, the low-end current converter of the region where the fault is located is automatically restarted through pole connection of the region where the fault is located.
Fig. 5 shows the switching of the corresponding circuit breaker when the fault inverter and the non-fault (i.e. sound) inverter are each performing their respective control actions, wherein the circuit breaker color black indicates off and white indicates on.
The second isolation control method comprises the following steps:
(1) If the type of the current differential protection action of the zone where the fault is located is the differential protection action of the high-end converter, determining that the fault type of the zone where the fault is located is the high-end converter fault.
(2) If the direct current side connection mode of the high-end current converter region of the fault is a quick breaker connection mode, the alternating current incoming line breaker of the high-end current converter region of the fault is jumped, the high-end current converter of the fault is locked and isolated, and meanwhile the low-end current converter of the region where the fault is located performs phase shifting restarting operation.
Fig. 5 shows the switching of the corresponding circuit breaker when the fault inverter and the non-fault (i.e. sound) inverter are each performing their respective control actions, wherein the circuit breaker color black indicates off and white indicates on.
A third isolation control method:
(1) If the type of the current differential protection action of the zone where the fault is located is the differential protection action of the low-end converter, determining that the fault type of the zone where the fault is located is the low-end converter fault.
(2) If the direct current side connection mode of the low-end converter region of the fault is not the quick breaker connection mode, the alternating current incoming line breaker of the low-end converter region of the fault is jumped, the pole locking and pole isolation operation of the region where the fault is located is executed, and after the low-end converter of the fault is isolated, the high-end converter of the region where the fault is located is automatically restarted through the pole connection of the region where the fault is located.
Fig. 5 shows the switching of the corresponding circuit breaker when the fault inverter and the non-fault (i.e. sound) inverter are each performing their respective control actions, wherein the circuit breaker color black indicates off and white indicates on.
A fourth isolation control method:
(1) If the type of the current differential protection action of the zone where the fault is located is the differential protection action of the low-end converter, determining that the fault type of the zone where the fault is located is the low-end converter fault.
(2) If the direct current side wiring mode of the low-end converter region of the fault is a quick breaker wiring mode, the alternating current incoming line breaker of the low-end converter region of the fault is jumped, the low-end converter of the fault is locked and isolated, and meanwhile, the high-end converter of the region where the fault is located performs phase-shifting restarting operation.
Fig. 5 shows the switching of the corresponding circuit breaker when the fault inverter and the non-fault (i.e. sound) inverter are each performing their respective control actions, wherein the circuit breaker color black indicates off and white indicates on.
A fifth isolation control method:
(1) If the type of the current differential protection action of the region where the fault is located is the extremely differential protection action, determining that the fault type of the region where the fault is located is the region fault.
(2) Whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, tripping the alternating current incoming line circuit breaker of the high-end current converter region of the region where the fault is located, and tripping the alternating current incoming line circuit breaker of the low-end current converter region of the region where the fault is located, and executing pole locking and pole isolation operations of the region where the fault is located.
A sixth isolation control method:
(1) If the types of the current differential protection actions of the zone where the fault is located are the polar differential protection action, the high-side converter differential protection action and the low-side converter differential protection action, determining that the fault types of the zone where the fault is located are zone faults, high-side converter faults and low-side converter faults.
(2) Whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, tripping the alternating current incoming line circuit breaker of the high-end current converter region where the fault is located, and tripping the alternating current incoming line circuit breaker of the low-end current converter region where the fault is located, and executing pole locking and pole isolation operations of the region where the fault is located.
A seventh isolation control method:
(1) If the type of the current differential protection action of the zone where the fault is located is a very differential protection action and one single-converter differential protection action of the high-side converter and the low-side converter, determining that the fault type of the zone where the fault is located is a zone fault and one single-converter fault of the high-side converter and the low-side converter.
(2) Whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, the alternating current incoming line circuit breakers of the single current converter region where the fault is located are not jumped, the pole locking and pole isolation operation of the region where the fault is located is executed, and after isolating the single current converter where the fault is located, the single current converter where the fault is located is automatically restarted through the pole connection of the region where the fault is located.
The embodiment of the invention also discloses a computer readable storage medium, wherein the computer readable storage medium is stored with computer program instructions; the computer program instructions, when executed by the processor, implement the method for isolating and controlling faults of the extra-high voltage converter station according to the embodiment.
The embodiment of the invention also discloses an isolation control system for the faults of the extra-high voltage converter station, which comprises the following components: the computer-readable storage medium as in the above embodiments.
In summary, the embodiment of the invention comprehensively considers the differential protection action results of the pole layer and the converter layer, adopts fault converter isolation and sound converter restarting control logic taking the differential protection of the converter, the differential protection of the pole layer and the direct current side wiring mode of the converter area as conditions, realizes the accurate identification and quick isolation of the fault converter and the quick restarting and continuous live running of the sound converter, improves the safety and reliability of the integral running of the extra-high voltage direct current, and avoids the expansion of the power failure range.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (3)
1. The isolation control method for the faults of the extra-high voltage converter station is characterized by comprising the following steps of:
judging the type of the current differential protection action triggered by the fault in one polar region of the extra-high voltage converter station, wherein the type of the differential protection action comprises at least one of the following steps: differential protection action of the high-side converter, differential protection action of the low-side converter and extremely differential protection action;
judging whether a direct current side wiring mode of a current converter area of a region where a fault is located is a quick circuit breaker wiring mode, wherein the quick circuit breaker wiring mode is as follows: for a converter area, a cathode breaker and a parallel breaker are sequentially connected in series between a cathode disconnecting link and a bypass disconnecting link, and an anode breaker is connected in series between the bypass disconnecting link and an anode disconnecting link, wherein the cathode breaker, the parallel breaker and the anode breaker are all quick breakers;
determining an isolation control method of the fault of the extra-high voltage converter station according to the type of the current differential protection action of the region where the fault is located and a direct current side wiring mode of a converter region of the region where the fault is located;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the zone where the fault is located is a high-end converter differential protection action, determining that the fault type of the zone where the fault is located is a high-end converter fault;
if the direct current side connection mode of the high-end converter region of the fault is not the quick breaker connection mode, tripping the alternating current incoming line breaker of the high-end converter region of the fault, executing pole locking and pole isolation operation of the region where the fault is located, and automatically restarting the low-end converter of the region where the fault is located through pole connection of the region where the fault is located after isolating the high-end converter of the fault;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the zone where the fault is located is a high-end converter differential protection action, determining that the fault type of the zone where the fault is located is a high-end converter fault;
if the direct current side wiring mode of the high-end current converter region of the fault is a quick circuit breaker wiring mode, tripping an alternating current incoming line circuit breaker of the high-end current converter region of the fault, locking and isolating the high-end current converter of the fault, and simultaneously executing phase-shifting restarting operation on the low-end current converter of the region where the fault is located;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the zone where the fault is located is a low-end converter differential protection action, determining that the fault type of the zone where the fault is located is a low-end converter fault;
if the direct current side connection mode of the low-end converter region of the fault is not the quick breaker connection mode, tripping the alternating current incoming line breaker of the low-end converter region of the fault, executing pole locking and pole isolation operation of the region where the fault is located, and automatically restarting the high-end converter of the region where the fault is located through pole connection of the region where the fault is located after isolating the low-end converter of the fault;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the zone where the fault is located is a low-end converter differential protection action, determining that the fault type of the zone where the fault is located is a low-end converter fault;
if the direct current side wiring mode of the low-end converter region of the fault is a quick breaker wiring mode, tripping an alternating current incoming line breaker of the low-end converter region of the fault, locking and isolating the low-end converter of the fault, and simultaneously executing phase-shifting restarting operation on the high-end converter of the region where the fault is located;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the region where the fault is located is an extremely differential protection action, determining that the fault type of the region where the fault is located is a region fault;
whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, tripping an alternating current incoming line circuit breaker of the high-end current converter region of the region where the fault is located, and tripping the alternating current incoming line circuit breaker of the low-end current converter region of the region where the fault is located, and executing pole locking and pole isolation operations of the region where the fault is located;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the types of the current differential protection actions of the zone where the fault is located are the extremely differential protection actions, the high-side converter differential protection actions and the low-side converter differential protection actions, determining that the fault types of the zone where the fault is located are zone faults, high-side converter faults and low-side converter faults;
whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, tripping the alternating current incoming line circuit breaker of the high-end current converter region where the fault is located, and tripping the alternating current incoming line circuit breaker of the low-end current converter region where the fault is located, and executing pole locking and pole isolating operations of the region where the fault is located;
the step of the isolation control method for determining the faults of the extra-high voltage converter station comprises the following steps:
if the type of the current differential protection action of the zone where the fault is located is an extremely differential protection action and one single-converter differential protection action of the high-side converter and the low-side converter, determining that the fault type of the zone where the fault is located is a zone fault and one single-converter fault of the high-side converter and the low-side converter;
whether the direct current side connection mode of the high-end current converter region and the low-end current converter region of the region where the fault is located is a quick circuit breaker connection mode or not, the alternating current incoming line circuit breakers of the single current converter region where the fault is located are not jumped, the pole locking and pole isolation operation of the region where the fault is located is executed, and after isolating the single current converter where the fault is located, the single current converter where the fault is located is automatically restarted through the pole connection of the region where the fault is located.
2. A computer-readable storage medium, characterized by: the computer readable storage medium has stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement the method for isolating and controlling faults in an extra-high voltage converter station of claim 1.
3. An isolated control system for faults in an extra-high voltage converter station, comprising: the computer-readable storage medium of claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110633913.7A CN113595039B (en) | 2021-06-07 | 2021-06-07 | Isolation control method, medium and system for faults of extra-high voltage converter station |
Applications Claiming Priority (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470923A (en) * | 2015-12-31 | 2016-04-06 | 国家电网公司 | Method for increasing current converter protection region for extra-high voltage converter station |
| WO2020233180A1 (en) * | 2019-05-21 | 2020-11-26 | 南京南瑞继保电气有限公司 | Current-limiting controllable lightning arrester, converter, power transmission system, and control method |
| CN112202150A (en) * | 2020-08-03 | 2021-01-08 | 国网宁夏电力有限公司 | Method, medium and system for isolating faults of single converter of extra-high voltage converter station |
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|---|---|---|---|---|
| CN105470923A (en) * | 2015-12-31 | 2016-04-06 | 国家电网公司 | Method for increasing current converter protection region for extra-high voltage converter station |
| WO2020233180A1 (en) * | 2019-05-21 | 2020-11-26 | 南京南瑞继保电气有限公司 | Current-limiting controllable lightning arrester, converter, power transmission system, and control method |
| CN112202150A (en) * | 2020-08-03 | 2021-01-08 | 国网宁夏电力有限公司 | Method, medium and system for isolating faults of single converter of extra-high voltage converter station |
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| Title |
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| 徐浩 ; 侍乔明 ; 欧阳帆 ; 刘海峰 ; 梁文武 ; 张磊 ; 李辉 ; 龚汉阳 ; .祁韶±800 kV特高压直流输电工程两种故障重启动逻辑研究.电力***保护与控制.2018,(第12期),全文. * |
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