CN107437795B - Polar ESOF control method for hybrid direct-current power transmission system and hybrid direct-current power transmission system - Google Patents
Polar ESOF control method for hybrid direct-current power transmission system and hybrid direct-current power transmission system 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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- 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
- H02H7/28—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 meshed systems
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The embodiment of the invention provides an electrode ESOF control method of a hybrid direct-current power transmission system and the hybrid direct-current power transmission system, relates to the technical field of power systems, and aims to ensure the stable operation of the system when an electrode ESOF command is sent out in the system. The scheme comprises the specific implementation steps executed by the corresponding rectifying station and the inverter station after the corresponding protection devices in the rectifying station and the inverter station send out the electrode ESOF command, so that the stable operation of the system is ensured.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an electrode ESOF control method of a hybrid direct-current power transmission system and the hybrid direct-current power transmission system.
Background
Emergency Shutdown (ESOF) is the highest priority command in all protection action policies and system operation commands of the dc system. When the direct current system has serious or permanent fault and the regulation of the control system reaches the limit, the direct current protection sends an ESOF command to the rectifying station and the inverter station. The ESOF achieves two primary purposes: the method is characterized in that firstly, the direct current electric arc of a fault point is eliminated, and secondly, an alternating current circuit breaker is disconnected and isolated from an alternating current system.
The ESOF command is completed by the control and communication system of the rectifying station and the inverter station. In a two-end direct-current transmission system based on a current source converter technology (LCC), after an ESOF command is sent out, a rectifier station and an inverter station respectively adopt a phase-shifting mode, a locking trigger pulse mode and a bypass-switching mode, so that direct current and voltage are successively reduced to zero, and an alternating-current incoming line switch of a converter transformer is disconnected, so that an alternating-current system and a direct-current system are isolated. In an extra-high voltage direct current transmission system, each pole consists of a double-twelve pulse converter valve which can be divided into a high-pressure valve bank and a low-pressure valve bank, so that an ESOF technology can be further divided into an electrode ESOF technology and a valve bank ESOF technology.
With the development of power electronic technology, the ultra-high voltage flexible direct current technology based on Voltage Source Converter (VSC) technology is becoming mature, and the three-terminal ultra-high voltage hybrid direct current system is gradually put into application. The typical structure of the three-terminal extra-high voltage hybrid direct current system comprises: 1 rectifier station adopting current source type converter technology (LCC), and 2 inverter stations adopting voltage source type converter technology (VSC). In order to guarantee the flexibility of the operation mode, a direct current switch can be installed at 2 VSC inverter station pole buses or direct current lines to isolate a fault end and guarantee the normal operation of a non-fault end.
The ESOF strategy of the three-end extra-high voltage hybrid direct current system involves communication among three stations and two different converter station types of LCC and VSC, the three stations are complex in control and communication, the problem that whether a direct current switch lamp is installed in an inverter station or not needs to be considered, and the timing sequence matching strategy is of great importance. If the ESOF strategy is not properly established, the operation stability of the direct current system and even the whole power grid is threatened.
Disclosure of Invention
The embodiment of the invention provides an electrode ESOF control method of a hybrid direct-current power transmission system and the hybrid direct-current power transmission system, and aims to ensure the stable operation of the system when an electrode ESOF command is sent out in the system.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect of an embodiment of the present invention, a polar ESOF control method for a hybrid dc power transmission system is provided, where the method is applied to the hybrid dc power transmission system, and the system includes: an LCC rectifier station and N VSC inverter stations, wherein N is an integer greater than or equal to 2, the DC lines connected with the LCC rectifier station and the DC buses connected with the VSC inverter station are all connected with a bus bar, the LCC rectifier station comprises rectifier station control devices, the VSC inverter station comprises inverter station control devices, and the rectifier station control devices are in communication connection with the inverter station control devices, the method comprises the following steps:
the rectification station pole control device receives a pole ESOF command from a rectification station, controls a pole converter valve of the LCC rectification station to forcibly shift the phase according to the pole ESOF command, and trips the AC circuit breaker; sending an electrode ESOF command to the VSC inverter station;
the pole control device corresponding to the inversion station controls the pole converter valve corresponding to the VSC inversion station to be locked according to the sent pole ESOF command;
and the pole control device of the rectification station controls the pole converter valve blocking pulse of the LCC rectification station.
Preferably, the rectifier station pole control device controls a pole converter valve blocking pulse of the LCC rectifier station, and includes:
and when the direct current in the LCC rectifying station is smaller than a threshold value, the rectifying station pole control device controls the pole converter valve blocking pulse of the LCC rectifying station.
In a second aspect of the embodiments of the present invention, there is provided a polar ESOF control method for a hybrid dc power transmission system, applied to the hybrid dc power transmission system, the method including: an LCC rectifier station and N VSC inverter stations, wherein N is an integer greater than or equal to 2, a direct current line connected with the LCC rectifier station and a direct current bus connected with the VSC inverter station are both connected with a bus bar, the LCC rectifier station comprises rectifier station control devices, the VSC inverter station comprises inverter station control devices, and the rectifier station control devices are in communication connection with the inverter station control devices, the method comprises the following steps:
the pole control device of the inversion station receives a pole ESOF command from the inversion station, controls a pole converter valve of the VSC inversion station to be locked according to the pole ESOF command, and trips the AC circuit breaker; transmitting an electrode ESOF command to a rectifier station control device;
the pole control device corresponding to the rectification station controls the corresponding pole converter valve of the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command;
and the corresponding pole control device of the rectification station controls the corresponding pole converter valve blocking pulse of the LCC rectification station.
Preferably, the pole control device corresponding to the rectifying station controls the latching pulse of the corresponding pole converter valve of the LCC rectifying station, and includes:
and when the direct current in the LCC rectifying station is smaller than a first threshold value, the pole control device corresponding to the rectifying station controls the blocking pulse of the pole converter valve corresponding to the LCC rectifying station.
Further preferably, when dc switches are installed on both sides of a dc line connected to the VSC inverter station, the method further includes:
when the direct current in the LCC rectifier station is smaller than a second threshold value, the inverter station control device controls the direct current fast switch to be switched off;
and a pole control device corresponding to the rectification station controls the double valve groups of the LCC rectification station to restart.
Further preferably, the pole control device corresponding to the rectification station controls the double-valve group of the LCC rectification station to restart, including:
and after the first time period, the pole control device corresponding to the rectification station controls the double valve groups of the LCC rectification station to restart.
In a third aspect of the embodiments of the present invention, there is provided a hybrid direct-current power transmission system, including: an LCC rectifier station and N VSC inverter stations, N is an integer greater than or equal to 2, the direct current line that the LCC rectifier station is connected with, the direct current line that the VSC inverter station is connected with all connect the busbar, the LCC rectifier station includes rectifier station controlling means, the VSC inverter station includes inverter station controlling means, the rectifier station controlling means with the inverter station controlling means communication connection, wherein:
when the pole control device of the rectification station receives a pole ESOF command from the rectification station, the pole converter valve of the LCC rectification station is controlled to forcibly shift the phase according to the pole ESOF command, and the alternating current circuit breaker is tripped; sending an electrode ESOF command to the VSC inverter station;
the pole control device corresponding to the inversion station controls the pole converter valve corresponding to the VSC inversion station to be locked according to the sent pole ESOF command;
and the pole control device of the rectification station controls the pole converter valve blocking pulse of the LCC rectification station.
Optionally, when the pole control device of the inverter station receives a pole ESOF command from the inverter station, the pole converter valve of the VSC inverter station is controlled to be locked according to the pole ESOF command, and the ac circuit breaker is tripped; transmitting an electrode ESOF command to a rectifier station control device;
the pole control device corresponding to the rectification station controls the corresponding pole converter valve of the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command;
and the corresponding pole control device of the rectification station controls the corresponding pole converter valve blocking pulse of the LCC rectification station.
Preferably, N is equal to 2, the system comprising: LCC rectifier station, first VSC contravariant station, second VSC contravariant station, every station all contains high-pressure valves and low-pressure valves, and the direct current circuit that LCC rectifier station is connected, the direct current circuit that first VSC contravariant station is connected, the direct current circuit that second VSC contravariant station is connected all connect the busbar that converges, the direct current circuit both sides installation direct current switch that second VSC contravariant station is connected, the LCC rectifier station includes rectifier station utmost point accuse device, first VSC contravariant station includes first contravariant station utmost point accuse device, second VSC contravariant station includes second contravariant station utmost point accuse device, rectifier station utmost point accuse device, first contravariant station utmost point accuse device and the equal communication connection of second contravariant station utmost point accuse device, wherein:
when the first inversion station pole control device receives a pole ESOF command from the first inversion station, controlling a pole converter valve of the first VSC inversion station to be locked according to the pole ESOF command, and tripping the AC circuit breaker; sending an electrode ESOF command to a rectification station pole control device and a second inversion station pole control device;
according to the sent pole ESOF command, a rectification station pole control device controls a pole converter valve corresponding to the LCC rectification station to forcibly shift the phase, and a second inversion station pole control device controls a pole converter valve corresponding to a second VSC inversion station to be locked;
when the direct current in the LCC rectifying station is smaller than a second threshold value, the second inverter station pole control device controls the direct current fast switch to be switched off;
and the pole control device of the rectification station controls the pole converter valve corresponding to the LCC rectification station to restart, and meanwhile, the pole control device of the second inversion station controls the pole converter valve corresponding to the second VSC inversion station to unlock.
Further preferably, when the second inversion station pole control device receives a pole ESOF command from the second inversion station, the pole converter valve of the second VSC inversion station is controlled to be locked according to the pole ESOF command, and the alternating current circuit breaker is tripped; sending an electrode ESOF command to a rectifying station pole control device and a first inverter station pole control device;
according to the sent pole ESOF command, a rectification station pole control device controls a pole converter valve corresponding to an LCC rectification station to forcibly shift the phase, and a first inversion station pole control device controls a pole converter valve corresponding to a first VSC inversion station to be locked;
when the direct current in the LCC rectifying station is smaller than a second threshold value, the second inverter station pole control device controls the direct current fast switch to be switched off;
the pole control device of the rectification station controls the pole converter valve set corresponding to the LCC rectification station to restart, and meanwhile, the pole control device of the first inversion station controls the pole converter valve corresponding to the first VSC inversion station to unlock.
The pole ESOF control method of the hybrid direct-current transmission system and the hybrid direct-current transmission system provided by the embodiment of the invention comprise specific implementation steps executed by the corresponding LCC rectification station and VSC inversion station after the corresponding protection devices in the rectification station and the inversion station send pole ESOF commands.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hybrid dc power transmission system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method of polar ESOF control for a hybrid dc power transmission system according to an embodiment of the present invention;
fig. 3 is a timing diagram of a method of polar ESOF control for a hybrid dc power transmission system according to an embodiment of the present invention;
fig. 4 is a flowchart of a method of polar ESOF control for another hybrid dc power transmission system according to an embodiment of the present invention;
fig. 5 is a timing diagram of a method of polar ESOF control for another hybrid dc power transmission system according to an embodiment of the present invention;
fig. 6 is a timing diagram of a method of polar ESOF control for a hybrid dc power transmission system according to another 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.
An embodiment of the present invention provides a hybrid dc power transmission system, including: an LCC (Chinese: Current Source converter technology) type rectifier station and N VSC (Voltage Source converter technology) type inverter stations, N being an integer greater than or equal to 2, the DC lines connected to the LCC rectifier station and the DC lines connected to the VSC inverter station are all connected with a bus bar, the LCC rectifier station comprises a rectifier station control device, the VSC inverter station comprises an inverter station control device, the rectifier station control device is in communication connection with the inverter station control device, wherein:
when a rectifying station has an extreme fault, the actions performed according to the extreme ESOF refer to the following:
when the pole control device of the rectification station receives a pole ESOF command from the rectification station, the pole converter valve of the LCC rectification station is controlled to forcibly shift the phase according to the pole ESOF command, and the alternating current circuit breaker is tripped; and sending an electrode ESOF command to the VSC inverter station.
And the pole control device corresponding to the inversion station controls the corresponding pole converter valve of the VSC inversion station to be locked according to the sent pole ESOF command.
And the pole control device of the rectification station controls the pole converter valve blocking pulse of the LCC rectification station.
Optionally, when an inverter station has an electrode fault, the following contents are referred to according to the actions executed by the electrode ESOF:
when the pole control device of the inverter station receives an electrode ESOF command from the inverter station, controlling a pole converter valve of the VSC inverter station to be locked according to the electrode ESOF command, and tripping the AC circuit breaker; an electrode ESOF command is transmitted to the rectifier station control device.
And the corresponding pole control device of the rectification station controls the corresponding pole converter valve of the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command.
And the corresponding pole control device of the rectification station controls the corresponding pole converter valve blocking pulse of the LCC rectification station.
Exemplary, pole faults described above include, but are not limited to: neutral bus faults and very high voltage bus faults. The pole converter valve can be a double valve group (namely a high-pressure valve group and a low-pressure valve group) or a single valve group.
As shown in fig. 1, taking N equal to 2 as an example, the system includes: an LCC rectifier station (LCC rectifier station A in figure 1), a first VSC inverter station (VSC inverter station B in figure 1), a second VSC inverter station (VSC inverter station C in figure 1), each station comprising a high-pressure valve set and a low-pressure valve set, DC lines connected with the LCC rectifier station, DC lines connected with the first VSC inverter station, DC lines connected with the second VSC inverter station all connect with a bus bar, DC switches are installed on both sides of the DC lines connected with the second VSC inverter station (DC switches are installed on both sides of the DC lines connected with the VSC inverter station C in figure 1), the LCC rectifier station comprises a rectifier station pole control device (not shown in figure 1), the first VSC inverter station comprises a first inverter station pole control device (not shown in figure 1), the second VSC inverter station comprises a second inverter station pole control device (not shown in figure 1), the rectifier station pole control device, the first inverter station pole control device and the second inverter station pole control device are all connected in communication, wherein:
when a pole fault occurs in the second inverter station, the following references are made to the actions performed according to the pole ESOF:
when the first inversion station pole control device receives a pole ESOF command from the first inversion station, controlling a pole converter valve of the first VSC inversion station to be locked according to the pole ESOF command, and tripping the AC circuit breaker; and sending an electrode ESOF command to the rectifying station pole control device and the second inverter station pole control device.
And controlling a pole converter valve corresponding to the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command, and controlling the pole converter valve corresponding to the second VSC inversion station to be locked by the second inversion station pole control device.
When the direct current in the LCC rectifying station is smaller than a second threshold value, the second inversion station pole control device controls the direct current fast switch to be switched off.
And the pole control device of the rectification station controls the pole converter valve corresponding to the LCC rectification station to restart, and meanwhile, the pole control device of the second inversion station controls the pole converter valve corresponding to the second VSC inversion station to unlock.
Optionally, when an electrode fault occurs in the second inverter station, reference is made to the following actions performed according to the electrode ESOF:
when the second inversion station pole control device receives a pole ESOF command from the second inversion station, controlling a pole converter valve of the second VSC inversion station to be locked according to the pole ESOF command, and tripping the alternating current circuit breaker; and sending an electrode ESOF command to the rectifying station pole control device and the first inversion station pole control device.
And controlling a pole converter valve corresponding to the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command rectification station pole control device, and controlling the pole converter valve corresponding to the first VSC inversion station to be locked by the first inversion station pole control device.
When the direct current in the LCC rectifying station is smaller than a second threshold value, the second inversion station pole control device controls the direct current fast switch to be switched off.
The pole control device of the rectification station controls the pole converter valve set corresponding to the LCC rectification station to restart, and meanwhile, the pole control device of the first inversion station controls the pole converter valve corresponding to the first VSC inversion station to unlock.
The hybrid direct-current transmission system provided by the embodiment of the invention comprises the specific implementation steps executed by the corresponding LCC rectification station and VSC inversion station after the corresponding protection devices in the rectification station and the inversion station send the electrode ESOF command, and by adopting the steps, the stable operation of a power grid can be ensured when the system sends the electrode ESOF, the operation reliability of the hybrid direct-current transmission system is improved, the defect of an emergency shutdown strategy of the hybrid direct-current transmission system is filled, and the hybrid direct-current transmission system has strong operability.
An embodiment of the present invention provides an electrode ESOF control method for a hybrid dc power transmission system, which is applied to the hybrid dc power transmission system described above, and as shown in fig. 2, the method includes:
201. the rectification station pole control device receives a pole ESOF command from a rectification station, controls a pole converter valve of the LCC rectification station to forcibly shift the phase according to the pole ESOF command, and trips the AC circuit breaker; and sending an electrode ESOF command to the VSC inverter station.
202. And the pole control device corresponding to the inversion station controls the corresponding pole converter valve of the VSC inversion station to be locked according to the sent pole ESOF command.
203. And the pole control device of the rectification station controls the pole converter valve blocking pulse of the LCC rectification station.
Preferably, the step 203 specifically includes the following steps:
203a, when the direct current in the LCC rectifying station is less than the threshold value, the rectifying station pole control device controls the pole converter valve blocking pulse of the LCC rectifying station.
Exemplary, pole faults described above include, but are not limited to: neutral bus faults and very high voltage bus faults. The pole converter valve can be a double valve group (namely a high-pressure valve group and a low-pressure valve group) or a single valve group.
The following gives specific execution steps corresponding to the pole ESOF command issued by the rectification station, based on the hybrid dc power transmission system shown in fig. 1.
As shown in fig. 3, taking an example of an a-pole high-voltage bus fault of an LCC rectifier station, the send-out pole ESOF policy can be decomposed into the following steps:
step c 1: sending out commands of tripping off a double-valve-group alternating-current circuit breaker of the rectifying station A, forced phase shifting of the double valve groups and bypass switching of a fault valve group; and requesting double valve group locking of the VSC inverter station B and the VSC inverter station C.
Step c 2: VSC inverter station B, VSC inverter station C double valve set lockout.
Step c 3: and after the direct current is reduced to 3%, the double-valve group A of the LCC rectification station locks pulses.
To this point, the three poles (dual valve block) are shut down.
The pole ESOF control method of the hybrid direct-current transmission system provided by the embodiment of the invention comprises the specific implementation steps executed by the corresponding LCC rectification station and VSC inverter station after the corresponding protection devices in the rectification station and the inverter station send pole ESOF commands.
An embodiment of the present invention provides an electrode ESOF control method for a hybrid dc power transmission system, which is applied to the hybrid dc power transmission system described above, and as shown in fig. 4, the method includes:
301. the pole control device of the inversion station receives a pole ESOF command from the inversion station, controls a pole converter valve of the VSC inversion station to be locked according to the pole ESOF command, and trips the AC circuit breaker; an electrode ESOF command is transmitted to the rectifier station control device.
302. And the corresponding pole control device of the rectification station controls the corresponding pole converter valve of the LCC rectification station to forcibly shift the phase according to the sent pole ESOF command.
303. And the corresponding pole control device of the rectification station controls the corresponding pole converter valve blocking pulse of the LCC rectification station.
Preferably, the step 303 specifically includes the following steps:
and when the direct current in the LCC rectifying station is smaller than a first threshold value, the pole control device corresponding to the rectifying station controls the blocking pulse of the pole converter valve corresponding to the LCC rectifying station.
Preferably, when the dc switches are installed on both sides of the dc line connected to the VSC inverter station in the hybrid dc power transmission system, the method further includes:
304. and when the direct current in the LCC rectifying station is smaller than a second threshold value, the inverter station control device controls the direct current fast switch to be switched off.
305. And a pole control device corresponding to the rectification station controls the double valve groups of the LCC rectification station to restart.
Preferably, the step 305 specifically includes the following steps:
and after the first time period, the pole control device corresponding to the rectification station controls the double valve groups of the LCC rectification station to restart.
The following gives specific execution steps corresponding to the pole ESOF command issued by the rectification station, based on the hybrid dc power transmission system shown in fig. 1.
As shown in fig. 5, taking a B-pole high-voltage bus fault of the VSC inverter station as an example, if the VSC inverter station B is not equipped with a dc switch, the X-pole ESOF policy is executed, and the following steps are decomposed:
step d 1: locking the double valve sets of the VSC inverter station B, and sending a command of tripping an alternating current circuit breaker of the double valve sets of the VSC inverter station B; and requesting double valve group locking of the LCC rectification station A and the VSC inversion station C.
Step d 2: and the LCC rectification station A double valve group forcibly shifts the phase.
Step d 3: c double valve groups of the VSC inverter station are locked.
Step d 4: and after the direct current is reduced to 3%, the double-valve group A of the LCC rectification station locks pulses.
At this point, the three stations finish the shutdown of the X-shaped pole (double valve group).
As shown in fig. 6, taking a high-voltage bus fault of a VSC inverter station C pole as an example, if a dc switch is installed on a dc line of the VSC inverter station C, a Y-type pole ESOF policy is executed, and the pole ESOF sent by the VSC inverter station C can be decomposed into the following steps:
step e 1: c double-valve-set locking of the VSC inversion station is carried out, and a command for tripping the C double-valve-set alternating-current circuit breaker of the VSC inversion station is sent out; and requesting the double valve groups of the rectification station and the inversion station B to be locked.
Step e 2: and the LCC rectification station A double valve group forcibly shifts the phase.
Step e 3: c double valve groups of the VSC inverter station are locked.
Step e 4: and after the direct current is reduced to be less than 3%, tripping the direct current fast switch.
Step e 5: and after the direct current switch is tripped, requesting the LCC rectification station A and the VSC inverter station B to restart.
Step e 6: and B double valve groups of the VSC inverter station are unlocked.
Step e 7: and C, restarting the double valve group of the LCC rectification station A.
And the VSC inverter station C finishes Y-shaped pole (double valve group) shutdown, and the LCC rectifier station A and the VSC inverter station B continue to operate.
The pole ESOF control method of the hybrid direct-current transmission system provided by the embodiment of the invention comprises the specific implementation steps executed by the corresponding LCC rectification station and VSC inverter station after the corresponding protection devices in the rectification station and the inverter station send pole ESOF commands.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. An electrode ESOF control method for a hybrid direct current power transmission system, applied to the hybrid direct current power transmission system, the system comprising: the system comprises an LCC rectification station, a first VSC inversion station and a second VSC inversion station; the direct current circuit that LCC rectifier station connects, the direct current generating line that VSC contravariant station connects all connect the busbar that converges, LCC rectifier station includes LCC rectifier station utmost point controlling means, VSC contravariant station includes VSC contravariant station utmost point controlling means, LCC rectifier station utmost point controlling means with VSC contravariant station utmost point controlling means communication connection, direct current fast switch is installed to the direct current circuit both sides that second VSC contravariant station connects, when the pole high voltage of LCC rectifier station breaks down, the method includes:
the LCC rectification station pole control device receives an electrode ESOF command from the LCC rectification station, sends out commands of tripping off a double-valve-set alternating-current circuit breaker of the LCC rectification station, forced phase shifting of the double valve sets and bypass switching of a fault valve set, and requests the double valve sets of the first VSC inversion station and the second VSC inversion station to be locked;
the first VSC inversion station and the second VSC inversion station are locked by double valve groups;
after the direct current is reduced to 3%, the double-valve group of the LCC rectifier station locks pulses;
when the direct current in the LCC rectifier station is smaller than a second threshold value, the second VSC inverter station pole control device controls the direct current fast switch, and the second VSC inverter station pole control device controls the direct current fast switch to be switched off;
and the LCC rectification station pole control device controls the double valve groups of the LCC rectification station to restart.
2. An electrode ESOF control method for a hybrid direct current power transmission system, applied to the hybrid direct current power transmission system, the system comprising: the system comprises an LCC rectification station, a first VSC inversion station and a second VSC inversion station; the direct-current line connected with the LCC rectifying station and the direct-current bus connected with the VSC inverter station are both connected with the bus bar, the LCC rectifying station comprises an LCC rectifying station pole control device, the VSC inverter station comprises a VSC inverter station pole control device, the LCC rectifying station pole control device is in communication connection with the VSC inverter station pole control device, and the first VSC inverter station is not provided with a direct-current switch; direct current fast switch is installed to the direct current circuit both sides that the second VSC contravariant station is connected, when the first VSC contravariant station utmost point high voltage bus trouble, the method includes:
the method comprises the steps that a first VSC inverter station pole control device receives an electrode ESOF command from a first VSC inverter station, the first VSC inverter station double-valve-group is locked, a command of jumping the first VSC inverter station double-valve-group alternating current circuit breaker is sent, and an LCC rectification station and a second VSC inverter station double-valve-group are requested to be locked;
the double valve sets of the LCC rectification station forcibly shift the phase;
the second VSC inverter station double valve group is locked;
after the direct current is reduced to 3%, the double-valve group of the LCC rectifier station locks pulses;
when the direct current in the LCC rectifier station is smaller than a second threshold value, the second VSC inverter station pole control device controls the direct current fast switch, and the second VSC inverter station pole control device controls the direct current fast switch to be switched off;
and the LCC rectification station pole control device controls the double valve groups of the LCC rectification station to restart, and meanwhile, the second inversion station pole control device controls the pole converter valve corresponding to the second VSC inversion station to unlock.
3. An electrode ESOF control method for a hybrid direct current power transmission system, applied to the hybrid direct current power transmission system, the system comprising: the system comprises an LCC rectification station, a first VSC inversion station and a second VSC inversion station; the direct current circuit that LCC rectifier station connects, the direct current generating line that VSC contravariant station connects all are connected with the busbar that converges, LCC rectifier station includes LCC rectifier station utmost point accuse device, VSC contravariant station includes VSC contravariant station utmost point accuse device, LCC rectifier station utmost point accuse device with VSC contravariant station utmost point accuse device communication connection, wherein, the direct current circuit both sides that second VSC contravariant station connects are installed the direct current fast switch, when second contravariant VSC station utmost point high voltage generating line trouble, the method includes:
a second VSC inverter station pole control device receives an electrode ESOF command from a second VSC inverter station, the second VSC inverter station double-valve-group is locked, a command of jumping over a second VSC inverter station double-valve-group alternating current circuit breaker is sent, and the LCC rectifier station and the first VSC inverter station double-valve-group are requested to be locked;
the double valve sets of the LCC rectification station forcibly shift the phase;
the second VSC inverter station double valve group is locked;
after the direct current is reduced to be less than 3%, tripping the direct current switch;
after the direct current switch is tripped, requesting the LCC rectifier station and the first VSC inverter station to restart;
unlocking the first VSC inverter station double valve group;
and restarting the double valve groups of the LCC rectification station.
4. A hybrid direct current power transmission system, characterized in that the system comprises: an LCC rectifier station, first VSC contravariant station, second VSC contravariant station, the direct current line that direct current circuit, VSC contravariant station that the LCC rectifier station is connected are all connected and are converged generating line, the LCC rectifier station includes LCC rectifier station utmost point accuse device, and VSC contravariant station includes VSC contravariant station utmost point accuse device, LCC rectifier station utmost point accuse device with VSC contravariant station utmost point accuse device communication connection, direct current fast switch is installed to the direct current line both sides that second VSC contravariant station is connected, when the extremely high voltage of LCC rectifier station breaks down, wherein:
when the LCC rectification station pole control device receives an electrode ESOF command from the LCC rectification station, sending out commands of tripping off a double-valve-set alternating-current circuit breaker of the LCC rectification station, forcibly shifting the phase of the double valve sets and throwing a bypass pair of a fault valve set, and requesting the double valve sets of the first VSC inversion station and the second VSC inversion station to be locked;
the first VSC inversion station and the second VSC inversion station are locked by double valve groups;
after the direct current is reduced to 3%, the double-valve group of the LCC rectifier station locks pulses;
when the direct current in the LCC rectifier station is smaller than a second threshold value, the second VSC inverter station pole control device controls the direct current fast switch, and the second VSC inverter station pole control device controls the direct current fast switch to be switched off;
and the LCC rectification station pole control device controls the double valve groups of the LCC rectification station to restart.
5. A hybrid direct current power transmission system, characterized in that the system comprises: the direct current circuit connected with the LCC rectifying station and the direct current circuit connected with the VSC inverting station are both connected with a bus bar, the LCC rectifying station comprises an LCC rectifying station pole control device, the VSC inverting station comprises a VSC inverting station pole control device, the LCC rectifying station pole control device is in communication connection with the VSC inverting station pole control device, and the first VSC inverting station is not provided with a direct current switch; direct current fast switch is installed to the direct current circuit both sides that the second VSC contravariant station is connected, during the utmost point high voltage bus trouble of first VSC contravariant station, wherein:
the method comprises the steps that a first VSC inverter station pole control device receives an electrode ESOF command from a first VSC inverter station, the first VSC inverter station double-valve-group is locked, a command of jumping the first VSC inverter station double-valve-group alternating current circuit breaker is sent, and an LCC rectification station and a second VSC inverter station double-valve-group are requested to be locked;
the double valve sets of the LCC rectification station forcibly shift the phase;
the second VSC inverter station double valve group is locked;
after the direct current is reduced to 3%, the double-valve group of the LCC rectifier station locks pulses;
when the direct current in the LCC rectifier station is smaller than a second threshold value, the second VSC inverter station pole control device controls the direct current fast switch, and the second VSC inverter station pole control device controls the direct current fast switch to be switched off;
and the LCC rectification station pole control device controls the double valve groups of the LCC rectification station to restart, and meanwhile, the second inversion station pole control device controls the pole converter valve corresponding to the second VSC inversion station to unlock.
6. A hybrid direct current power transmission system, characterized in that the system comprises: the system comprises an LCC rectification station, a first VSC inversion station and a second VSC inversion station; the direct current circuit that direct current circuit, VSC contravariant station that LCC rectifier station connects are all connected and are converged generating line, LCC rectifier station includes LCC rectifier station utmost point controlling means, and VSC contravariant station includes VSC contravariant station utmost point controlling means, LCC rectifier station utmost point controlling means with VSC contravariant station utmost point controlling means communication connection, direct current fast switch is installed to the direct current circuit both sides that second VSC contravariant station is connected, when second VSC contravariant station utmost point high voltage bus trouble, wherein:
a second VSC inverter station pole control device receives an electrode ESOF command from a second VSC inverter station, the second VSC inverter station double-valve-group is locked, a command of jumping over a second VSC inverter station double-valve-group alternating current circuit breaker is sent, and the LCC rectifier station and the first VSC inverter station double-valve-group are requested to be locked;
the double valve sets of the LCC rectification station forcibly shift the phase;
the second VSC inverter station double valve group is locked;
after the direct current is reduced to be less than 3%, tripping the direct current switch;
after the direct current switch is tripped, requesting the LCC rectifier station and the first VSC inverter station to restart;
unlocking the first VSC inverter station double valve group;
and restarting the double valve groups of the LCC rectification station.
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| CN110739715B (en) * | 2019-11-15 | 2021-03-02 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method for online switching on and off of DC network of flexible direct-current station of multi-terminal hybrid DC power transmission system |
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