CN109873346B - DC power transmission common grounding electrode system maintenance method and device - Google Patents
DC power transmission common grounding electrode system maintenance method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for overhauling a direct current transmission common grounding electrode system, which comprise the following steps: simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station grounding grid under a preset operation condition; calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station; when the bias current of the single transformer of the converter station is detected to be larger than the preset current threshold, a temporary grounding wire is installed on a preset tower of the grounding electrode circuit of the direct current transmission common grounding electrode system, the simulation model is adopted again to simulate the direct current transmission common grounding electrode system added with the temporary grounding wire until the bias current of the single transformer of the converter station after simulation is not larger than the preset current threshold, the influence on the converter station during maintenance of the grounding electrode circuit of the direct current transmission common grounding electrode system can be effectively reduced, and the safety during maintenance can be effectively improved.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current power transmission, in particular to a method and a device for overhauling a direct-current power transmission common grounding electrode system.
Background
High-voltage direct-current transmission has the advantages of large transmission capacity, low manufacturing cost, small loss, asynchronous networking and the like, and meanwhile, the construction and the operation of direct-current projects are continuously increased. The grounding electrode is an important part of a high-voltage direct-current transmission system, but the problems of large floor area, difficulty in land acquisition and dense landform and population are more prominent, and a multi-circuit direct-current shared grounding electrode technology is adopted in part of direct-current projects for solving the problems. The multiple loops of direct current share the same grounding electrode, namely the multiple loops of direct current share the same grounding electrode, and whether grounding electrode lines are connected with the grounding electrode or not is controlled through respective switches in the central tower. However, the common grounding electrode may also have a certain influence on the dc system, and when one return dc single-pole ground is operated and another return dc grounding electrode is used for line maintenance, the common grounding electrode may have an influence on the safe and stable operation of the converter station. Specifically, when a certain direct current grounding electrode line is overhauled, a corresponding switch is disconnected in a central tower, the grounding switch of the grounding electrode line in the station is in a grounding state (namely the grounding electrode line is connected with an in-station grounding grid), permanent grounding wires are hung on towers at the head end and the tail end of the grounding electrode line, and a temporary grounding wire is hung when lines near the towers within 10 kilometers away from the grounding electrode are overhauled, so that a path is provided for current, when a direct current unipolar ground runs, the current is discharged into the ground from the grounding electrode, part of the grounding current is picked up by a grounding device close to the towers and flows into the grounding grid in a converter station through the grounding electrode line, and then flows into an alternating current system through a neutral point of a transformer, so that a direct current magnetic bias phenomenon is caused, and the safe and stable.
Disclosure of Invention
The embodiment of the invention provides a method and a device for overhauling a direct current power transmission common grounding electrode system, which can effectively reduce the influence on a current changing station when an earthing electrode circuit of the direct current power transmission common grounding electrode system is overhauled, and can effectively improve the safety during overhauling.
An embodiment of the present invention provides a method for overhauling a dc power transmission common ground electrode system, including:
simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station grounding grid under a preset operation condition; before the direct-current transmission common grounding electrode system is simulated by adopting the preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition, the method specifically comprises the following steps: when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled, permanent grounding wires are arranged on the first base tower and the nth base tower of the grounding electrode circuit; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit; judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower;
calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station;
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold, a temporary grounding wire is installed on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system, the simulation model is adopted again to simulate the direct current transmission common grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold.
As an improvement of the above scheme, the simulating the dc transmission common ground electrode system by using a preset simulation model to obtain the current flowing into the ground grid of the converter station under the preset operation condition specifically includes:
constructing a simulation model according to the direct-current power transmission common grounding electrode system;
setting the simulation model according to the preset operation condition; the preset operation working condition is that a common grounding electrode of the direct current power transmission common grounding electrode system runs in a one-return direct current single-pole ground, and the other return direct current grounding electrode circuit is in a maintenance state;
and simulating the direct-current power transmission common grounding electrode system after the m-th base rod tower is provided with the temporary grounding wire by adopting the simulation model to obtain the current flowing into the converter station grounding grid.
As an improvement of the above scheme, the calculating a bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station specifically includes:
calculating the bias current of a single transformer of the converter station according to the following formula:
It＝K·In/n
wherein, ItThe magnetic bias current of a single transformer of the converter station is K, the shunt coefficient of the earth network current of the converter station flowing into the neutral point of the transformer is InAnd n is the number of the running transformers for the current flowing into the grounding grid of the converter station.
As an improvement of the above scheme, it is determined whether the earth electrode line of the dc power transmission common earth electrode system needs to take measures by the following steps:
judging whether the bias current of the single transformer of the converter station is greater than a preset current threshold value or not; if the bias current of the single transformer of the converter station is not greater than the preset current threshold, judging that no measure needs to be taken on the grounding electrode circuit; and if the bias current of the single transformer of the converter station is greater than the preset current threshold value, judging that a temporary grounding wire needs to be arranged on a preset tower of the grounding electrode circuit.
As an improvement of the above scheme, when it is detected that the bias current of the single transformer in the converter station is greater than the preset current threshold, a temporary ground line is installed on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and the simulation model is adopted again to simulate the dc transmission common ground electrode system to which the temporary ground line is added until the bias current of the single transformer in the converter station after simulation is not greater than the preset current threshold, the method specifically includes:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower close to the converter station in the grounding electrode circuit, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
As an improvement of the above scheme, when it is detected that the bias current of the single transformer in the converter station is greater than the preset current threshold, a temporary ground line is installed on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and the simulation model is adopted again to simulate the dc transmission common ground electrode system to which the temporary ground line is added until the bias current of the single transformer in the converter station after simulation is not greater than the preset current threshold, the method specifically includes:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower located in the middle section of the grounding electrode line, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
Another embodiment of the present invention correspondingly provides an apparatus for repairing a dc power transmission common ground electrode system, including:
the simulation module is used for simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station earth screen under a preset operation condition; before the direct-current transmission common grounding electrode system is simulated by adopting the preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition, the method specifically comprises the following steps: when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled, permanent grounding wires are arranged on the first base tower and the nth base tower of the grounding electrode circuit; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit; judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower;
the calculation module is used for calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station;
and the maintenance module is used for installing a temporary grounding wire on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system when the magnetic bias current of the single converter station transformer is detected to be larger than a preset current threshold value, and simulating the direct current transmission common grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the magnetic bias current of the single converter station transformer after simulation is not larger than the preset current threshold value.
Compared with the prior art, the method and the device for overhauling the direct current transmission common grounding electrode system disclosed by the embodiment of the invention simulate the direct current transmission common grounding electrode system by adopting a preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition, calculate the bias current of a single transformer of the converter station according to the current flowing into the converter station grounding grid, when the bias current of the single transformer of the converter station is detected to be larger than the preset current threshold value, install the temporary grounding wire on the preset pole tower of the grounding electrode circuit of the direct current transmission common grounding electrode system, and simulate the direct current transmission common grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the bias current of the single transformer of the converter station after simulation is not larger than the preset current threshold value, and play a role of shunting by adopting the temporary grounding wire arranged on the grounding electrode circuit, the current flowing into the converter station grounding grid is reduced, the influence of the common grounding electrode on the converter station during the maintenance of the grounding electrode circuit can be effectively reduced, and the safety of personnel and equipment during the maintenance is ensured.
Another embodiment of the present invention provides a dc power transmission common ground electrode system maintenance device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the dc power transmission common ground electrode system maintenance method according to the above embodiment of the present invention.
Another embodiment of the present invention provides a storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the dc power transmission common ground electrode system overhaul method described in the above embodiment of the present invention.
Drawings
Fig. 1 is a schematic flow chart of a dc power transmission common ground electrode system maintenance method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a bias current of a single transformer of a converter station according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of adding a grounding point to a DC power transmission common grounding electrode system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a bias current curve when a temporary ground line is installed on a ground line near a converter station end according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a bias current curve when a temporary grounding line is installed in the middle of the grounding electrode line according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an overhaul device of a dc power transmission common ground electrode system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a method for overhauling a dc power transmission common ground electrode system according to an embodiment of the present invention includes:
and S11, simulating the direct current transmission common grounding electrode system by adopting a preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition.
Preferably, before step S11, the method further includes:
when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled, permanent grounding wires are arranged on the first base tower and the nth base tower of the grounding electrode circuit; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit;
judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower.
Specifically, step S11 is:
constructing a simulation model according to the direct-current power transmission common grounding electrode system;
setting the simulation model according to the preset operation condition; the preset operation working condition is that a common grounding electrode of the direct current power transmission common grounding electrode system runs in a one-return direct current single-pole ground, and the other return direct current grounding electrode circuit is in a maintenance state;
and simulating the direct-current power transmission common grounding electrode system after the m-th base rod tower is provided with the temporary grounding wire by adopting the simulation model to obtain the current flowing into the converter station grounding grid.
It should be noted that the dc power transmission common ground electrode system may include a ground electrode, a ground electrode line, and a converter station earth grid; and a plurality of base towers are distributed on the grounding polar line. Establishing a simulation model for the direct current power transmission common grounding electrode system on simulation software; the simulation software may be CDEGS simulation software, and the simulation model may include an earth electrode model, an earth electrode line model, a converter station earth network model, and a tower grounding device model.
Preferably, the preset operation condition is that the common grounding electrode is operated in a return direct current single-pole ground, and the other return direct current grounding electrode circuit is in a maintenance state. Specifically, when a return direct current grounding electrode line is overhauled, namely the mth base rod tower on the grounding electrode line is overhauled, the grounding electrode line and the inner net of the converter station are in a grounding and connecting state. The m-th base tower is any tower on the grounding pole line, and can be a head-end tower or a tail-end tower.
In an alternative embodiment, when the mth base tower is within a certain distance from the grounding electrode, a permanent grounding wire needs to be hung on the towers at the head and tail ends of the grounding electrode line, and a temporary grounding wire needs to be hung on the mth base tower.
In another alternative embodiment, when the mth base tower is not within a certain distance from the grounding electrode, only the permanent grounding wires need to be hung on the towers at the head and tail ends of the grounding electrode line, and the temporary grounding wires do not need to be hung.
Preferably, the range in this embodiment may be 10 km. Further, the simulation model is adopted to simulate the direct-current power transmission common grounding electrode system after the m-th base rod tower is provided with the temporary grounding wire, namely, three base rod towers are arranged on the grounding electrode line to suspend the grounding wire, and the direct current which flows through the grounding electrode line and finally flows into the converter station grounding grid is picked up by the m-th base rod tower.
And S12, calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station.
Preferably, the bias current of a single transformer of the converter station is calculated according to the following formula:
It＝K·In/n
wherein, ItThe magnetic bias current of a single transformer of the converter station is K, the shunt coefficient of the earth network current of the converter station flowing into the neutral point of the transformer is InAnd n is the number of the running transformers for the current flowing into the grounding grid of the converter station.
It can be understood that most of the direct current flowing into the grounding grid of the converter station through the grounding electrode line enters the alternating current system through the neutral point of the transformer in the converter station, so that the direct current magnetic bias phenomenon of the transformer in the converter station is caused. Therefore, the magnetic biasing current of the single transformer of the converter station when the grounding wire is hung on the mth base rod tower is calculated according to the current which is obtained through simulation and flows into the grounding grid of the converter station through the grounding electrode line.
S13, when it is detected that the bias magnetic current of the single converter station transformer is larger than a preset current threshold value, installing a temporary grounding wire on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system, and simulating the direct current transmission common grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the bias magnetic current of the single converter station transformer after simulation is not larger than the preset current threshold value.
Preferably, whether measures need to be taken by an earth electrode line of the dc power transmission common earth electrode system is judged by the following steps:
judging whether the bias current of the single transformer of the converter station is greater than a preset current threshold value or not; if the bias current of the single transformer of the converter station is not greater than the preset current threshold, judging that no measure needs to be taken on the grounding electrode circuit; and if the bias current of the single transformer of the converter station is greater than the preset current threshold value, judging that a temporary grounding wire needs to be arranged on a preset tower of the grounding electrode circuit.
Preferably, the preset current threshold may be set to 10A in the present embodiment.
In an optional embodiment, when the bias current of a single transformer in the converter station is not greater than the preset current threshold, it is determined that no maintenance measure needs to be taken for the grounding electrode line of the dc transmission common grounding electrode system.
Preferably, simulation is performed after the temporary grounding wire is hung on the mth base rod tower, the calculated bias current of the single transformer of the converter station does not exceed the preset current threshold value 10A, and no measure needs to be taken on the grounding electrode circuit, such as installing the temporary grounding wire.
In another optional embodiment, when the bias current of a single transformer in the converter station is greater than the preset current threshold, it is determined that a temporary grounding line needs to be installed on a preset tower of the grounding electrode line.
Preferably, after the temporary grounding wire is hung on the mth base pole tower, simulation is performed, and when the calculated bias current of a single transformer of the converter station does not exceed the preset current threshold value of 10A, when the grounding wire needs to be additionally hung on the pole tower of the grounding electrode circuit during the maintenance of the grounding electrode circuit of the on-site actual direct-current transmission common grounding electrode system, it can be understood that the grounding point is additionally arranged on the grounding electrode circuit.
Further, in an alternative embodiment, step S13 specifically includes:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower close to the converter station in the grounding electrode circuit, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
It will be appreciated that the measures taken include installing a temporary earth connection, i.e. adding an earth connection, in said earth pole line close to the tower of the converter station, in case said mth base tower is serviced, i.e. said mth base tower suspends an earth connection. Specifically, in this embodiment, the tower closest to the converter station is set as the tower at the head end of the grounding electrode line, and the tower closest to the grounding electrode in the grounding electrode line is set as the tower at the tail end of the grounding electrode line. And (3) installing temporary grounding wires from the tower closest to the first-section tower of the grounding electrode line to the grounding electrode direction one by one, simulating the direct-current transmission shared grounding electrode system additionally provided with the temporary grounding wires by adopting the simulation model after one operation, stopping installing the temporary grounding wires until the bias magnetic current of a single transformer of the converter station is not more than the preset current threshold value when the temporary grounding wires are hung on the mth basic tower obtained by simulation, and determining the number of the towers hanging the temporary grounding wires according to simulation times.
Further, in another optional embodiment, step S13 specifically includes:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower located in the middle section of the grounding electrode line, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
It can be understood that the measures include installing a temporary grounding wire to the tower in the middle section of the grounding electrode line, namely adding grounding points at the midpoint of the grounding electrode line and towards the left and right ends of the midpoint, in the case of performing maintenance on the mth base rod tower, namely suspending the grounding wire from the mth base rod tower. Specifically, grounding wires are hung from the pole towers at the midpoint of the grounding electrode line to the two ends of the midpoint, the simulation model is adopted to simulate the direct-current transmission shared grounding electrode system with the temporary grounding wires added after one operation is executed, the magnetic biasing current of a single transformer of the converter station is not larger than the preset current threshold value when the m-th basic pole tower is used for hanging the temporary grounding wires obtained through simulation, the temporary hanging of the grounding wires is stopped, and the number of the pole towers hanging the temporary grounding wires can be determined according to simulation times.
The maintenance method of the direct current transmission common grounding electrode system provided by the embodiment of the invention comprises the steps of simulating the direct current transmission common grounding electrode system by adopting a preset simulation model to obtain the current flowing into a converter station grounding grid under the preset operation condition, calculating the bias magnetic current of a single transformer of the converter station according to the current flowing into the converter station grounding grid, installing a temporary grounding wire on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system when the bias magnetic current of the single transformer of the converter station is detected to be larger than a preset current threshold value, and simulating the direct current transmission common grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the bias magnetic current of the single transformer of the converter station after simulation is not larger than the preset current threshold value, and playing a shunting role by adopting the temporary grounding wire arranged on the grounding electrode circuit, the current flowing into the converter station grounding grid is reduced, the influence of the common grounding electrode on the converter station during the maintenance of the grounding electrode circuit can be effectively reduced, and the safety of personnel and equipment during the maintenance is ensured.
In another preferred embodiment, on the basis of the above embodiments, the dc transmission common ground electrode system maintenance method is applied to a dc transmission common ground electrode system including a torpedo ridge common ground electrode, a chu ear dc ear east side ground electrode line, and a huidong converter station earth grid. For example, a 209-base tower is arranged on the earth electrode line on the east side of the chu ear direct current ear.
And (3) modeling the common grounding electrode of the Yunling mountain, the Chu ear direct current ear east side grounding electrode line, the ear east converter station grounding grid and the tower grounding device by using CDEGS simulation software to obtain a grounding electrode model, a grounding electrode line model, a converter station grounding grid model and a tower grounding device model.
The current operation working condition is that one direct current transmission system in the common grounding electrode operates 3000A for the Xingan direct current single pole earth, and the other direct current transmission system is in a maintenance state for the ear east side grounding electrode line. When the earth electrode line on the east side of the ear is overhauled, firstly, a permanent earth wire is hung on a tower 1# at the head end of the earth electrode line (in the embodiment, the head end of the earth electrode line is the end of the earth electrode line close to the converter station) and a tower 209# at the tail end of the earth electrode line, and then a temporary earth wire needs to be hung on a certain tower within 10 kilometers away from the earth electrode. Preferably, the tower 184# -209# is overhauled in the embodiment.
Calculating the earth operation of the Xingan direct current monopole, namely 3000A current enters the earth through the common grounding electrode of the Yunlong mountain, and when the earth electrode circuit at the east of the ear is overhauled, the tower picks up the current I flowing into the earth grid of the current converting station at east of the ear through the grounding electrode circuitn. According to formula It＝K·InAnd/n, wherein the value of K is 0.9, the value of n is 12, and the bias current I of the single transformer of the east-to-ear converter station is calculatedt。
Referring to fig. 2, which is a schematic diagram of the magnetic biasing current of a single transformer in a converter station according to an embodiment of the present invention, temporary grounding lines are respectively installed on # 184 to # 209 pole towers one by one, simulation is respectively performed, and the magnetic biasing current of the single transformer in the converter station when the temporary grounding lines are suspended on the pole towers is calculated. In this embodiment, the preset current threshold is 10A. As shown in fig. 2, the bias current of a single transformer in the converter station is greater than 10A, measures need to be taken for a grounding pole line, and when a 208# tower is overhauled, the bias current of the single transformer is the largest. In this embodiment, a case of performing maintenance on # 184 tower is selected for description.
Referring to fig. 3, which is a schematic view of adding a grounding point in a dc transmission common grounding electrode system according to an embodiment of the present invention, a tower near a converter station ground grid is a # 1 tower, a tower near a common grounding electrode in a torpedo ridge is a # 209 tower, and a grounding line is hung on a tower between the # 1 tower and the # 209 tower of an east-ear grounding electrode line, so that the grounding point can be added.
Referring to fig. 4, which is a schematic diagram of a bias current curve when a temporary grounding line is installed on a grounding electrode line near a converter station end according to an embodiment of the present invention, on the basis that a 208# tower suspends a grounding line, as the number of grounding points near the converter station increases, the bias current of a single transformer in an east-ear converter station changes. Specifically, as the 1# tower suspends the permanent grounding wire, the grounding wire is hung from the 2# tower at the end of the grounding electrode line close to the converter station base by base. As shown in fig. 3, when 8 grounding points are added, namely, grounding lines are hung on 2# to 9# towers, the simulation result shows that the bias current of a single transformer in the east converter station is less than 10A, and the overhaul of 208# tower is completed.
Referring to fig. 5, which is a schematic diagram of a bias current curve when a temporary grounding line is installed in the middle section of the grounding electrode line provided in an embodiment of the present invention, on the basis that the grounding line is suspended on the 208# tower, the bias current of a single transformer in the ear-to-east converter station changes with the increase of the number of grounding points. Another measure is to hang a grounding wire in the middle section of the grounding electrode line on the east side of the ear, as shown in fig. 4, when the grounding wires are hung on 95#, 96# and 97# towers, that is, 3 grounding points are added, the simulation result shows that the bias current of a single transformer in the east converter station is less than 10A, and the 208# tower is repaired.
The method for overhauling the direct-current transmission common grounding electrode system is applied to an actual power grid. By adopting the method, the influence of part of common grounding electrodes on the converter station during the maintenance of the grounding electrode circuit can be effectively and conveniently reduced without adding extra equipment, the safe and stable operation of a direct current system can be effectively ensured, and the method is easy to realize.
Referring to fig. 6, it is a schematic structural diagram of an overhaul device of a dc power transmission common ground electrode system according to an embodiment of the present invention, including:
the simulation module 1 is used for calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station;
the calculation module 2 is used for calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station through the grounding electrode circuit;
and the maintenance module 3 is configured to, when it is detected that the magnetic bias current of the single converter station transformer is greater than the preset current threshold, install a temporary ground wire on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and re-use the simulation model to simulate the dc transmission common ground electrode system to which the temporary ground wire is added until the magnetic bias current of the single converter station transformer after simulation is not greater than the preset current threshold.
Preferably, the simulation module 1 comprises:
the permanent grounding wire installing unit is used for installing permanent grounding wires on a first base tower and an nth base tower of a grounding electrode circuit of the direct current transmission common grounding electrode system when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit;
the first judgment unit is used for judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower.
The model building unit is used for building a simulation model according to the direct-current power transmission common grounding electrode system;
the setting unit is used for setting the simulation model according to the preset operation condition; the preset operation working condition is that a common grounding electrode of the direct current power transmission common grounding electrode system runs in a one-return direct current single-pole ground, and the other return direct current grounding electrode circuit is in a maintenance state;
and the simulation unit is used for simulating the direct-current power transmission common grounding electrode system after the m-th base rod tower is provided with the temporary grounding wire by adopting the simulation model to obtain the current flowing into the converter station grounding grid.
Preferably, the calculation module 2 comprises:
the converter station single transformer magnetic biasing current calculation unit is used for calculating the magnetic biasing current of the converter station single transformer according to the following formula:
It＝K·In/n
wherein, ItThe magnetic bias current of a single transformer of the converter station is K, the shunt coefficient of the earth network current of the converter station flowing into the neutral point of the transformer is InAnd n is the number of the running transformers for the current flowing into the grounding grid of the converter station.
Preferably, the service module 3 comprises:
the second judgment unit is used for judging whether the bias current of the single transformer of the converter station is greater than a preset current threshold value or not; if the bias current of the single transformer of the converter station is not greater than the preset current threshold, judging that no measure needs to be taken on the grounding electrode circuit; and if the bias current of the single transformer of the converter station is greater than the preset current threshold value, judging that a temporary grounding wire needs to be arranged on a preset tower of the grounding electrode circuit.
Preferably, the service module 3 further comprises:
the first maintenance unit is used for installing a temporary grounding wire based on the mth base pole tower when the magnetic biasing current of the single converter station transformer is detected to be larger than the preset current threshold value, installing the temporary grounding wire on a pole tower close to the converter station in the grounding pole circuit, and simulating the direct-current transmission shared grounding pole system added with the temporary grounding wire by adopting the simulation model again until the magnetic biasing current of the single converter station transformer after simulation is not larger than the preset current threshold value;
and the second maintenance unit is used for installing a temporary grounding wire on the basis of the mth base pole tower when the magnetic biasing current of the single converter station transformer is detected to be larger than the preset current threshold value, installing the temporary grounding wire on the pole tower positioned in the middle section of the grounding electrode circuit, and simulating the direct-current transmission shared grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the magnetic biasing current of the single converter station transformer after simulation is not larger than the preset current threshold value.
Fig. 6 is a schematic structural diagram of an overhaul device for a dc power transmission common ground electrode system according to an embodiment of the present invention. The dc transmission common ground electrode system maintenance device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the embodiments of the dc transmission common ground electrode system overhaul method are implemented, for example, in step S13 shown in fig. 1, when it is detected that the bias magnetic current of the single transformer in the converter station is greater than the preset current threshold, a temporary ground wire is installed on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and the simulation model is adopted again to simulate the dc transmission common ground electrode system to which the temporary ground wire is added until the bias magnetic current of the single transformer in the converter station after simulation is not greater than the preset current threshold. Or, the processor implements the functions of the modules/units in the embodiments of the apparatuses when executing the computer program, for example, the overhaul module 3 is configured to, when detecting that the bias current of the single transformer in the converter station is greater than the preset current threshold, install a temporary ground line on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and simulate the dc transmission common ground electrode system to which the temporary ground line is added by using the simulation model again until the bias current of the single transformer in the converter station after simulation is not greater than the preset current threshold.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of instruction segments of a computer program capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program in the dc power transmission common ground electrode system maintenance device.
The direct current transmission common grounding electrode system overhauling device can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The direct current power transmission common grounding electrode system overhauling device can comprise, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the schematic diagram is merely an example of the dc power transmission common ground electrode system maintenance device, and does not constitute a limitation of the dc power transmission common ground electrode system maintenance device, and may include more or less components than those shown, or some components in combination, or different components, for example, the dc power transmission common ground electrode system maintenance device may further include input and output devices, network access devices, buses, and the like.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor can be a microprocessor or the processor can be any conventional processor and the like, the processor is a control center of the DC power transmission common grounding electrode system maintenance device, and various interfaces and lines are used for connecting various parts of the whole DC power transmission common grounding electrode system maintenance device.
The memory can be used for storing the computer program and/or the module, and the processor realizes various functions of the DC power transmission common earth electrode system maintenance device by running or executing the computer program and/or the module stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the modules/units integrated by the DC power transmission common grounding electrode system overhaul device can be stored in a computer readable storage medium if the modules/units are realized in the form of software functional units and sold or used as independent products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A maintenance method for a direct current transmission common grounding electrode system is characterized by comprising the following steps:
simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station grounding grid under a preset operation condition; before the direct-current transmission common grounding electrode system is simulated by adopting the preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition, the method specifically comprises the following steps: when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled, permanent grounding wires are arranged on the first base tower and the nth base tower of the grounding electrode circuit; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit; judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower;
calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station;
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold, a temporary grounding wire is installed on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system, the simulation model is adopted again to simulate the direct current transmission common grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold.
2. The method for overhauling the direct current transmission common grounding electrode system according to claim 1, wherein the step of simulating the direct current transmission common grounding electrode system by using a preset simulation model to obtain the current flowing into the grounding grid of the converter station under the preset operation condition comprises the following specific steps:
constructing a simulation model according to the direct-current power transmission common grounding electrode system;
setting the simulation model according to the preset operation condition; the preset operation working condition is that a common grounding electrode of the direct current power transmission common grounding electrode system runs in a one-return direct current single-pole ground, and the other return direct current grounding electrode circuit is in a maintenance state;
and simulating the direct-current power transmission common grounding electrode system after the m-th base rod tower is provided with the temporary grounding wire by adopting the simulation model to obtain the current flowing into the converter station grounding grid.
3. The method for overhauling the direct current transmission common grounding electrode system according to claim 1, wherein the calculating the bias current of the single transformer of the converter station according to the current flowing into the grounding grid of the converter station specifically comprises:
calculating the bias current of a single transformer of the converter station according to a formula (1):
It＝K·In/n (1)
wherein, ItThe magnetic bias current of a single transformer of the converter station is K, the shunt coefficient of the earth network current of the converter station flowing into the neutral point of the transformer is InAnd n is the number of the running transformers for the current flowing into the grounding grid of the converter station.
4. The method for overhauling the direct current transmission common grounding electrode system as recited in claim 1, wherein whether the grounding electrode line of the direct current transmission common grounding electrode system needs to take measures is judged by the following steps:
judging whether the bias current of the single transformer of the converter station is greater than a preset current threshold value or not; if the bias current of the single transformer of the converter station is not greater than the preset current threshold, judging that no measure needs to be taken on the grounding electrode circuit; and if the bias current of the single transformer of the converter station is greater than the preset current threshold value, judging that a temporary grounding wire needs to be arranged on a preset tower of the grounding electrode circuit.
5. The dc transmission common ground electrode system overhauling method according to claim 4, wherein when detecting that the bias current of the single transformer in the converter station is greater than the preset current threshold, installing a temporary grounding line on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and re-adopting the simulation model to simulate the dc transmission common ground electrode system with the temporary grounding line added until the bias current of the single transformer in the converter station after simulation is not greater than the preset current threshold, specifically comprising:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower close to the converter station in the grounding electrode circuit, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
6. The dc transmission common ground electrode system overhauling method according to claim 4, wherein when detecting that the bias current of the single transformer in the converter station is greater than the preset current threshold, installing a temporary grounding line on a preset tower of the ground electrode line of the dc transmission common ground electrode system, and re-adopting the simulation model to simulate the dc transmission common ground electrode system with the temporary grounding line added until the bias current of the single transformer in the converter station after simulation is not greater than the preset current threshold, the method further comprises:
when the magnetic biasing current of the single transformer of the converter station is detected to be larger than the preset current threshold value, a temporary grounding wire is installed on the basis of the mth base pole tower, the temporary grounding wire is installed on a pole tower located in the middle section of the grounding electrode line, the simulation model is adopted again to simulate the direct-current transmission shared grounding electrode system added with the temporary grounding wire until the magnetic biasing current of the single transformer of the converter station after simulation is not larger than the preset current threshold value.
7. The utility model provides a DC transmission common ground pole system overhauls device which characterized in that includes:
the simulation module is used for simulating the direct-current transmission common grounding electrode system by adopting a preset simulation model to obtain current flowing into a converter station earth screen under a preset operation condition; before the direct-current transmission common grounding electrode system is simulated by adopting the preset simulation model to obtain the current flowing into the converter station grounding grid under the preset operation condition, the method specifically comprises the following steps: when the mth base tower of the grounding electrode circuit of the direct current transmission common grounding electrode system is overhauled, permanent grounding wires are arranged on the first base tower and the nth base tower of the grounding electrode circuit; wherein m is more than or equal to 1 and less than or equal to n, and n is the number of the towers of the grounding electrode circuit; judging whether the mth base rod tower is within a preset range from the grounding electrode of the direct current power transmission common grounding electrode system; if yes, a temporary grounding wire is arranged on the mth base rod tower; if not, a temporary grounding wire does not need to be arranged on the mth base rod tower;
the calculation module is used for calculating the bias current of a single transformer of the converter station according to the current flowing into the grounding grid of the converter station;
and the maintenance module is used for installing a temporary grounding wire on a preset tower of a grounding electrode circuit of the direct current transmission common grounding electrode system when the magnetic bias current of the single converter station transformer is detected to be larger than a preset current threshold value, and simulating the direct current transmission common grounding electrode system added with the temporary grounding wire by adopting the simulation model again until the magnetic bias current of the single converter station transformer after simulation is not larger than the preset current threshold value.
8. A dc power transmission common ground electrode system overhaul apparatus comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor when executing the computer program implementing the dc power transmission common ground electrode system overhaul method as claimed in any one of claims 1 to 6.
9. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the dc power transmission common ground electrode system maintenance method according to any one of claims 1 to 6.
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