CN104362611A - Synchronous double-pole unlocking-locking method of high-voltage direct-current power transmission system in in-station grounding mode - Google Patents
Synchronous double-pole unlocking-locking method of high-voltage direct-current power transmission system in in-station grounding mode Download PDFInfo
- Publication number
- CN104362611A CN104362611A CN201410536170.1A CN201410536170A CN104362611A CN 104362611 A CN104362611 A CN 104362611A CN 201410536170 A CN201410536170 A CN 201410536170A CN 104362611 A CN104362611 A CN 104362611A
- Authority
- CN
- China
- Prior art keywords
- group
- pole
- control system
- solution
- single valve
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001360 synchronised effect Effects 0.000 title abstract 2
- 230000000903 blocking effect Effects 0.000 claims description 76
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
-
- 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
-
- H02J13/0062—
Abstract
A synchronous double-pole unlocking-locking method of a high-voltage direct-current power transmission system in an in-station grounding mode is characterized in that only after receiving an unlocking/locking command issued by a direct-current station control system to unlock or lock a single valve unit/double valve unit of a positive pole, a pole control system of the positive pole controls related equipment to unlock/lock the positive pole; after receiving an unlocking/locking command issued by the direct-current station control system to unlock/lock a single valve unit/double valve unit of a negative pole, a pole control system of the negative pole controls related equipment to unlock/lock the negative pole; the direct-current station control system transits commands through a control bus, the control bus is higher than a local area network in transmitting speed, the control bus is shorter, the length of the control bus from the direct-current station control system to the pole control system of the positive pole is basically equal to that of the control bus from the direct-current station control system to the pole control system of the negative pole, unlocking/locking synchronism of the positive pole and the negative pole is guaranteed, unbalanced current is avoided entering a station, and in-station equipment safety and personal safety are guaranteed.
Description
Technical field
The present invention relates generally to technical field of high-voltage direct, refers in particular to a kind of bipolar method that synchronously unblocks of (namely by high-speed grounding switch ground connection) under earthing mode in HVDC (High Voltage Direct Current) transmission system station.
Background technology
High voltage direct current transmission has become the inexorable trend of modern power systems development, and in the power network development strategy of " national network, transferring electricity from the west to the east, north and south supply mutually ", high voltage dc transmission technology will play a leading role.And in HVDC (High Voltage Direct Current) transmission system, earth electrode is important component part, and in Practical Project construction process, because the external causes such as expropriation of land addressing cause earth electrode not go into operation as scheduled, the bipolar smooth operation of impact to voltage DC transmission system, serious economic benefit and the social benefit hindering transmission of electricity, and the easiest existing solution utilizes the bipolar operational mode (as shown in Figure 2) of Grounding in station (namely by high-speed grounding switch ground connection) to substitute the bipolar operational mode (as shown in Figure 1) of earth electrode exactly.
And the bipolar operational mode of interior Grounding of taking to stand replaces the bipolar operational mode of earth electrode, must be optimized controlling functions, enable DC control function adapt to the bipolar operational mode of HVDC (High Voltage Direct Current) transmission system by Grounding (namely by high-speed grounding switch ground connection) in station, must ensure to reduce as far as possible earth current in HVDC (High Voltage Direct Current) transmission system running and enter in station ground network to ensure station equipment and personal safety.
As shown in Figure 3, bipolar in Siemens's DC techniques route solution/locking is achieved in that I. operations staff sends the solution/blocking order of the single valve group/bivalve group of positive pole and negative pole from the man-machine interface 7 of work station, II. the solution/blocking order of the single valve group/bivalve group of positive pole sends the pole control system 1 of positive pole to by local area network (LAN) 8, the solution/blocking order of the single valve group/bivalve group of negative pole sends the pole control system 2 of negative pole to by local area network (LAN) 8, III. after the pole control system 1 of positive pole receives the solution/blocking order of single valve group/bivalve group of the positive pole sent from the man-machine interface 7 of work station, the single valve group of positive pole corresponding to the solution/blocking order of the single valve group/bivalve group of this positive pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system 4 of positive pole, the pole control system 2 of negative pole receive from the man-machine interface 7 of work station send negative pole single valve group/bivalve group solution/blocking order after, the single valve group of negative pole corresponding to the solution/blocking order of the single valve group/bivalve group of this negative pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system 5 of negative pole, IV. the straight-wavy valve set control system 4 of positive pole performs the single valve group or bivalve group solution/locking order that start positive pole, and the straight-wavy valve set control system 5 of negative pole performs the single valve group or bivalve group/locking order that start negative pole.Because the transmission of local area network (LAN) (LAN net) 8 exists time delay, the length of local area network (LAN) 8 is longer and arrange that reason causes positive pole local area network (LAN) length and negative pole local area network (LAN) length possible inconsistent due to screen cabinet, cannot ensure that the pole control system 1 of positive pole and the pole control system 2 of negative pole receive the solution/blocking order of the single valve group/bivalve group of positive pole and the negative pole sent from the man-machine interface (HMI) of work station respectively simultaneously, namely the unanimously solution/locking simultaneously of bipolar height cannot be ensured, the difference about hundreds of millisecond may be there is in bipolar solution/locking moment, therefore bipolar exist certain unsymmetrical current instantaneously in solution/locking, according to the bipolar operational mode of Grounding in station, this unsymmetrical current may enter in station, to constitute a threat to station equipment and personal safety.
Summary of the invention
For overcoming the defect had in above-mentioned prior art, the object of the present invention is to provide a kind of bipolar method that synchronously unblocks in HVDC (High Voltage Direct Current) transmission system station under earthing mode, the method can ensure the unanimously solution/locking simultaneously of bipolar height, ensure the synchronism of bipolar solution/locking order, avoid occurring that unsymmetrical current enters in station, ensure station equipment and personal safety.
For achieving the above object, the technical solution adopted in the present invention is:
The bipolar method that synchronously unblocks in HVDC (High Voltage Direct Current) transmission system station under earthing mode, comprises the following steps: A. sends the solution/blocking order of the single valve group/bivalve group of positive pole and negative pole; B. solution/the blocking order of the single valve group/bivalve group of positive pole sends the pole control system of positive pole to by local area network (LAN), and the solution/blocking order of the single valve group/bivalve group of negative pole sends the pole control system of negative pole to by local area network (LAN); C., after the pole control system of positive pole receives the solution/blocking order of single valve group/bivalve group of positive pole, the solution/blocking order of the single valve of positive pole group/bivalve group is sent to direct current station Ore-controlling Role by control bus; After the pole control system of negative pole receives the solution/blocking order of single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve of negative pole group/bivalve group to direct current station Ore-controlling Role by control bus; D., after direct current station Ore-controlling Role receives the solution/blocking order of the solution/blocking order of the single valve group/bivalve group of positive pole and the single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole to the pole control system of positive pole and the pole control system of negative pole respectively by control bus simultaneously; E., after the pole control system of positive pole receives the solution/blocking order of single valve group/bivalve group of the positive pole that direct current station Ore-controlling Role sends, the single valve group of positive pole corresponding to the solution/blocking order of the single valve group/bivalve group of this positive pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system of positive pole; After the pole control system of negative pole receives the solution/blocking order of single valve group/bivalve group of the negative pole that direct current station Ore-controlling Role sends, the single valve group of negative pole corresponding to the solution/blocking order of the single valve group/bivalve group of this negative pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system of negative pole; F. the straight-wavy valve set control system of positive pole performs the single valve group or bivalve group solution/locking order that start positive pole, and the straight-wavy valve set control system of negative pole performs the single valve group or bivalve group/locking order that start negative pole.
Can be found out by said method, the pole control system of last positive pole after the solution/blocking order of the single valve group/bivalve group receiving the positive pole that direct current station Ore-controlling Role issues, just to control relevant device separate/locking to positive pole, the pole control system of negative pole after the solution/blocking order of the single valve group/bivalve group receiving the negative pole that direct current station Ore-controlling Role issues, controls relevant device anticathode again carry out separating/locking, and direct current station Ore-controlling Role the solution/blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole is sent respectively to the pole control system of positive pole and the pole control system of negative pole by control bus simultaneously, the transfer rate of control bus wants fast compared to the transfer rate of local area network (LAN), and the length of control bus is shorter, direct current station Ore-controlling Role to the control bus length of the pole control system of positive pole and direct current station Ore-controlling Role basically identical to the control bus length of the pole control system of negative pole, thus ensure that the synchronism of the solution/locking of the single valve group/bivalve group of positive pole and negative pole, avoid to greatest extent occurring that unsymmetrical current enters in station, ensure station equipment and personal safety.
Solution/the blocking order of the single valve group/bivalve group of the positive pole in described steps A and negative pole sends from the man-machine interface of operations staff's work station.Solution/the blocking order of the positive pole that man-machine interface thus can be made to send and the single valve group/bivalve group of negative pole by sync response, can ensure station equipment and personal safety at positive pole and negative pole.
Compared with conventional art, the beneficial effect that the present invention brings is:
In the method, simultaneously direct current station Ore-controlling Role respectively solution/the blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole is sent to the pole control system of positive pole and the pole control system of negative pole by control bus, the transfer rate of control bus is fast compared with the transfer rate of local area network (LAN), and the length of control bus is shorter, direct current station Ore-controlling Role to the control bus length of the pole control system of positive pole and direct current station Ore-controlling Role basically identical to the control bus length of the pole control system of negative pole, thus ensure that the synchronism of bipolar solution/locking, avoid occurring that unsymmetrical current enters in station, ensure station equipment and personal safety.
Accompanying drawing explanation
Fig. 1 is the HVDC (High Voltage Direct Current) transmission system primary structure schematic diagram of the bipolar operational mode adopting earth electrode ground connection;
Fig. 2 is the HVDC (High Voltage Direct Current) transmission system primary structure schematic diagram of the bipolar operation method adopting ground network in station;
Fig. 3 is the part-structure block diagram of HVDC (High Voltage Direct Current) transmission system;
Fig. 4 is the flow chart that existing bipolar solution/locking realizes;
Fig. 5 is the flow chart of the embodiment of the present invention.
Reference numeral: 1, the pole control system of positive pole; 2, the pole control system of negative pole; 3, direct current station Ore-controlling Role; 4, the straight-wavy valve set control system of positive pole; 41, the high end valve set control system of positive pole; 42, the low end valve set control system of positive pole; 5, the straight-wavy valve set control system of negative pole; 51, the high end valve set control system of negative pole; 52, the low end valve set control system of negative pole; 6, control bus; 7, the man-machine interface of work station; 8, local area network (LAN).
Embodiment
As shown in Figure 3-4, the bipolar method that synchronously unblocks in HVDC (High Voltage Direct Current) transmission system station of the present invention under earthing mode, comprises the following steps: A. sends the solution/blocking order of the single valve group/bivalve group of positive pole and negative pole; B. solution/the blocking order of the single valve group/bivalve group of positive pole sends the pole control system 1 of positive pole to by local area network (LAN), solution/the blocking order of the single valve group/bivalve group of negative pole sends the pole control system 2 of negative pole to by local area network (LAN), wherein, the pole control system 1 of positive pole and the pole control system 2 of negative pole are positioned at the same side (rectification side or inverter side); C., after the pole control system 1 of positive pole receives the solution/blocking order of single valve group/bivalve group of positive pole, the solution/blocking order of the single valve of positive pole group/bivalve group is sent to direct current station Ore-controlling Role 3 by control bus 6; After the pole control system 2 of negative pole receives the solution/blocking order of single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve of negative pole group/bivalve group to direct current station Ore-controlling Role 3 by control bus 6; D., after direct current station Ore-controlling Role 3 receives the solution/blocking order of the solution/blocking order of the single valve group/bivalve group of positive pole and the single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole to the pole control system 1 of positive pole and the pole control system 2 of negative pole respectively by control bus 6 simultaneously; E., after the pole control system 1 of positive pole receives the solution/blocking order of single valve group/bivalve group of the positive pole that direct current station Ore-controlling Role 3 sends, the single valve group of positive pole corresponding to the solution/blocking order of the single valve group/bivalve group of this positive pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system 4 of positive pole; After the pole control system 2 of negative pole receives the solution/blocking order of single valve group/bivalve group of the negative pole that direct current station Ore-controlling Role 3 sends, the single valve group of negative pole corresponding to the solution/blocking order of the single valve group/bivalve group of this negative pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system 5 of negative pole; Wherein, the straight-wavy valve set control system 4 of positive pole is made up of the high-end straight-wavy valve set control system 41 of positive pole and the high-end straight-wavy valve set control system 42 of positive pole, and the straight-wavy valve set control system 5 of negative pole is made up of the high-end straight-wavy valve set control system 51 of negative pole and the high-end straight-wavy valve set control system 52 of negative pole; such as, for being provided with the positive pole of bivalve group, during positive pole unblock bivalve group, the configuration status of bivalve group should be: by-pass switch and the isolating switch of the high end valve group of rectification side all pull open, by-pass switch and the isolating switch of the low end valve group of rectification side all pull open, by-pass switch and the isolating switch of the high end valve group of inverter side all pull open, by-pass switch and the isolating switch of the low end valve group of inverter side all pull open, thus when the pole control system 1 of the positive pole of rectification side receives the unlock command of the bivalve group of the positive pole that direct current station Ore-controlling Role 3 sends, the pole control system 1 of rectification side positive pole judges that valve group configuration status condition meets, so the pole control system 1 of the positive pole of this side will send bivalve group unlock command to the straight-wavy valve set control system 4 (i.e. the high end valve set control system 41 of positive pole and the low end valve set control system 42 of positive pole) of positive pole, when the pole control system 1 of the positive pole of inverter side receives the unlock command of the bivalve group of the positive pole that direct current station Ore-controlling Role 3 sends, the pole control system 1 of inverter side positive pole judges that valve group configuration status condition meets, so the pole control system 1 of the positive pole of this side will send two unlock command to the straight-wavy valve set control system 4 (i.e. the high end valve set control system 41 of positive pole and the low end valve set control system 42 of positive pole) of positive pole, for unblock single valve group, if when unlocking single valve group, bivalve group configuration state is: by-pass switch and the isolating switch of the high end valve group of rectification side all pull open, the bypass of the low end valve group of rectification side is pulled open and isolating switch closes, the by-pass switch of the high end valve group of inverter side pulls open and isolating switch closes, by-pass switch and the isolating switch of the low end valve group of inverter side all pull open, when the pole control system 1 of the positive pole of rectification side receives the unlock command of the single valve group of the positive pole that direct current station Ore-controlling Role 3 sends, the pole control system 1 of rectification side positive pole judges that high end valve group configuration status condition meets, so then the pole control system 1 of the positive pole of this side will send the unlock command (i.e. the unlock command of high end valve group) of single valve group to the high end valve set control system 41 of positive pole, when the pole control system 1 of the positive pole of inverter side receives the unlock command of the single valve group of the positive pole that direct current station Ore-controlling Role 3 sends, the pole control system 1 of inverter side positive pole judges that low end valve group configuration status condition meets, so then the pole control system 1 of the positive pole of this side will send the unlock command (i.e. the unlock command of low end valve group) of single valve group to the low end valve set control system 42 of positive pole.F. the straight-wavy valve set control system 4 of positive pole performs the single valve group or bivalve group solution/locking order that start positive pole, and the straight-wavy valve set control system 5 of negative pole performs the single valve group or bivalve group/locking order that start negative pole.
Due to the same side (rectification side or inverter side) in HVDC (High Voltage Direct Current) transmission system, the pole control system 1 of positive pole, the pole control system 2 of negative pole are connected with direct current station Ore-controlling Role 3 respectively by control bus 6, thus between the pole control system 1 of positive pole and control bus 6, between the pole control system 2 of negative pole and control bus 6 all by control bus 6 move instruction.The pole control system 1 of last positive pole after the solution/blocking order of the single valve group/bivalve group receiving the positive pole that direct current station Ore-controlling Role 3 issues, just to control relevant device separate/locking to positive pole, the pole control system 2 of negative pole after the solution/blocking order of the single valve group/bivalve group receiving the negative pole that direct current station Ore-controlling Role 3 issues, controls relevant device anticathode again carry out separating/locking, and direct current station Ore-controlling Role 3 solution/the blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole is sent respectively to the pole control system 1 of positive pole and the pole control system 2 of negative pole by control bus 6, the transfer rate of control bus 6 wants fast compared to the transfer rate of local area network (LAN), and the length of control bus 6 is shorter, control bus 6 length of control bus 6 length of the pole control system 1 of direct current station Ore-controlling Role 3 to positive pole and the pole control system 2 of direct current station Ore-controlling Role 3 to negative pole is basically identical, thus ensure that the synchronism of positive pole and negative pole solution/locking, avoid occurring that unsymmetrical current enters in station, ensure station equipment and personal safety.
Solution/the blocking order of the single valve group/bivalve group of the positive pole in described steps A and negative pole sends from the man-machine interface 7 of operations staff's work station.Solution/the blocking order of the bipolar single valve group/bivalve group that the man-machine interface 7 of work station thus can be made to send by sync response, can ensure station equipment and personal safety at positive pole and negative pole.
Above-listed detailed description is illustrating for one of the present invention possible embodiments, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (2)
1. the bipolar method that synchronously unblocks in HVDC (High Voltage Direct Current) transmission system station under earthing mode, is characterized in that: the method comprises the following steps:
A. solution/the blocking order of the single valve group/bivalve group of positive pole and negative pole is sent;
B. solution/the blocking order of the single valve group/bivalve group of positive pole sends the pole control system (1) of positive pole to by local area network (LAN), and the solution/blocking order of the single valve group/bivalve group of negative pole sends the pole control system (2) of negative pole to by local area network (LAN);
C., after the pole control system (1) of positive pole receives the solution/blocking order of single valve group/bivalve group of positive pole, the solution/blocking order of the single valve of positive pole group/bivalve group is sent to direct current station Ore-controlling Role (3) by control bus (6); After the pole control system (2) of negative pole receives the solution/blocking order of single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve of negative pole group/bivalve group to direct current station Ore-controlling Role (3) by control bus (6);
D., after direct current station Ore-controlling Role (3) receives the solution/blocking order of the solution/blocking order of the single valve group/bivalve group of positive pole and the single valve group/bivalve group of negative pole, send the solution/blocking order of the single valve group/bivalve group of the solution/blocking order of the single valve of positive pole group/bivalve group and negative pole to the pole control system (1) of positive pole and the pole control system (2) of negative pole respectively by control bus (6) simultaneously;
E., after the pole control system (1) of positive pole receives the solution/blocking order of single valve group/bivalve group of the positive pole that direct current station Ore-controlling Role (3) sends, the single valve group of positive pole corresponding to the solution/blocking order of the single valve group/bivalve group of this positive pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system (4) of positive pole; After the pole control system (2) of negative pole receives the solution/blocking order of single valve group/bivalve group of the negative pole that direct current station Ore-controlling Role (3) sends, the single valve group of negative pole corresponding to the solution/blocking order of the single valve group/bivalve group of this negative pole or the configuration status of bivalve group issue single valve group or the solution/blocking order of bivalve group to the straight-wavy valve set control system (5) of negative pole;
F. the straight-wavy valve set control system (4) of positive pole performs the single valve group or bivalve group solution/locking order that start positive pole, and the straight-wavy valve set control system (5) of negative pole performs the single valve group or bivalve group/locking order that start negative pole.
2. the bipolar method that synchronously unblocks in HVDC (High Voltage Direct Current) transmission system station according to claim 1 under earthing mode, is characterized in that: the solution/blocking order of the single valve group/bivalve group of the positive pole in described steps A and negative pole sends from the man-machine interface of operations staff's work station (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410536170.1A CN104362611B (en) | 2014-10-11 | 2014-10-11 | Bipolar synchronization solution/blocking method under earthing mode in HVDC transmission system station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410536170.1A CN104362611B (en) | 2014-10-11 | 2014-10-11 | Bipolar synchronization solution/blocking method under earthing mode in HVDC transmission system station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104362611A true CN104362611A (en) | 2015-02-18 |
| CN104362611B CN104362611B (en) | 2016-07-27 |
Family
ID=52529849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410536170.1A Expired - Fee Related CN104362611B (en) | 2014-10-11 | 2014-10-11 | Bipolar synchronization solution/blocking method under earthing mode in HVDC transmission system station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104362611B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05300645A (en) * | 1992-04-21 | 1993-11-12 | Toshiba Corp | Dc power transmission controller |
| CN101814732A (en) * | 2009-12-02 | 2010-08-25 | 南京南瑞继保电气有限公司 | Double 12-pulse valve bank coordinated-control method for ultra-high voltage direct-current transmission system |
-
2014
- 2014-10-11 CN CN201410536170.1A patent/CN104362611B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05300645A (en) * | 1992-04-21 | 1993-11-12 | Toshiba Corp | Dc power transmission controller |
| CN101814732A (en) * | 2009-12-02 | 2010-08-25 | 南京南瑞继保电气有限公司 | Double 12-pulse valve bank coordinated-control method for ultra-high voltage direct-current transmission system |
Non-Patent Citations (1)
| Title |
|---|
| 刘艳华: ""±800kV云广直流输电工程控制保护系统提高可靠性的措施"", 《广东电力》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104362611B (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102709946A (en) | Method for realizing seamless switching of micro-grid from grid-connection operation to isolated network operation | |
| CN207039185U (en) | A kind of control device for preventing One Common Earthing Electrode electric current from sealing in another time straight-flow system | |
| CN103730945B (en) | Quick power switching method and system | |
| CN103441487A (en) | Method for making high-voltage side group valve put into operation and go out of operation | |
| CN108258736A (en) | A kind of digital distributor for carrier rocket | |
| CN104362660A (en) | Double-pole operation method of high-voltage direct-current power transmission system in in-station grounding mode | |
| CN105958655A (en) | Remote restart apparatus for communication system of transformer substation | |
| CN105429127B (en) | A kind of electrically actuated distribution system | |
| CN108400652A (en) | Station control system based on wireless telecommunications and electrical changing station | |
| CN104578131A (en) | DC transmission automatic power flow reversal control method | |
| CN203219308U (en) | Time synchronization system adopting double-set double-clock redundancy technology | |
| CN104362611A (en) | Synchronous double-pole unlocking-locking method of high-voltage direct-current power transmission system in in-station grounding mode | |
| CN202333973U (en) | Solid-state transfer valve body and solid-state transfer switch provided with same | |
| CN103066895A (en) | Anti-explosion soft-starting synchronous seamless switching technology for mines | |
| CN104218670B (en) | A kind of super-container vessel power interruption recovering starting method | |
| CN104362659B (en) | In HVDC transmission system station, under the ground connection method of operation, bipolar synchronization joins jumping method | |
| CN201750206U (en) | Conversion device for main control station and non-main control station of DC control system | |
| CN204905673U (en) | A station service wiring system for thermal power factory | |
| CN104977546B (en) | A kind of Secondary Direct Electrical Resources towards transformer station lose method of discrimination | |
| CN103414247A (en) | Loop control right coordination switching system and switching method of multi-loop direct-current power transmission system | |
| CN203707637U (en) | Bus coupler cabinet handcart and interlocking circuit of bus coupler isolation cabinet handcart | |
| CN105846438B (en) | Partition power grid flow control method and control device | |
| CN106329465B (en) | It is a kind of using residual voltage as the zero-sequenceprotection method and apparatus of criterion | |
| CN203437214U (en) | Three-phase high voltage power supply control system for electrostatic precipitator | |
| CN107887983B (en) | Co-building monitoring system and co-building method for extra-high voltage transformer substation and converter station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160727 Termination date: 20181011 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |