CN113054629A - Direct-current power distribution network and optimization control method and device thereof - Google Patents

Direct-current power distribution network and optimization control method and device thereof Download PDF

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Publication number
CN113054629A
CN113054629A CN201911380067.1A CN201911380067A CN113054629A CN 113054629 A CN113054629 A CN 113054629A CN 201911380067 A CN201911380067 A CN 201911380067A CN 113054629 A CN113054629 A CN 113054629A
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China
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station
distribution network
fault
direct current
master station
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CN201911380067.1A
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CN113054629B (en
Inventor
胡丁文
曾林翠
王莉
安乐
金猛
杜涛
张玉荣
田楠
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China XD Electric Co Ltd
Xian XD High Voltage Apparatus Co Ltd
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China XD Electric Co Ltd
Xian XD High Voltage Apparatus Co Ltd
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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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The application discloses a direct current power distribution network and an optimization control method and device thereof. When a single-pole grounding fault occurs, the load switch is controlled to be switched off so as to cut off the grounding resistance of the secondary main control station; and when the single-pole grounding fault is eliminated, controlling the load switch to be closed. After the load switch of the secondary main leader station is disconnected, the grounding resistor on the grounding branch circuit is out of operation, and the current flowing through a fault point is reduced due to the fact that at least one part of the grounding resistor is out of operation, so that the increase of system operation loss under the condition of single-pole fault operation is avoided, and the situation that the fault surface is continuously enlarged or more serious due to the increase of fault current can be avoided.

Description

Direct-current power distribution network and optimization control method and device thereof
Technical Field
The application relates to the technical field of electric power, in particular to a direct current power distribution network and an optimization control method and device thereof.
Background
With the development and application of new technologies and the continuous increase of urban load requirements, the requirements of users on the quality of electric energy are increasingly increased. On one hand, instantaneous drop, fluctuation, harmonic wave and three-phase unbalance of the power grid voltage can have a great influence on production and power equipment of sensitive load enterprises (such as semiconductor manufacturing industry), and enterprise loss can be caused seriously. On the other hand, the power grid has certain requirements on the power factor of the industrial enterprise, the power factor is low, not only is the power consumption cost of the enterprise increased, but also the power grid is contrary to the current policies of energy conservation and consumption reduction, and most industrial enterprises increase the power factor by adding reactive compensation devices, so that the enterprise cost is increased. In the face of new energy power generation and a plurality of requirements of users on a power distribution system, the traditional alternating current power grid structure is increasingly unable to be qualified, and a power distribution system which is more environment-friendly, safer and more reliable, and better in quality and economy needs to be considered.
Compared with the traditional alternating-current power distribution network, the direct-current power distribution network can reduce the use of a power electronic converter, thereby reducing the electric energy loss and the operation cost; the contradiction between a large power grid and a distributed power supply can be effectively coordinated, and the value and the benefit of distributed energy resources can be fully exerted; the flexible direct-current power distribution network converter based on the voltage source converter can flexibly absorb or send out reactive power, dynamically compensate the reactive power of an alternating-current system side and an alternating-current load side, and play a role in compensating the static reactive power compensator. Therefore, the research on the flexible direct current distribution network based on the MMC has great market development potential and demand.
At present, scholars at home and abroad carry out a great deal of research work on a direct current distribution network, including application scenes, topological structures, control strategies, trend optimization strategies, protection strategies, key equipment and the like of the direct current distribution network, and also put into operation some demonstration projects, including a multi-end alternating current and direct current hybrid flexible distribution network demonstration project of a gulf of the zhhai and tang jia, a master direct current distribution network demonstration project of the jia of zhui hai, a master flexible direct current distribution network demonstration project of the Xin city of the Jiandong of Zhejiang, and an alternating current and direct current distribution network project of the small town of the same Li.
With the increasing complexity of the direct current distribution network, the grounding resistance in the system is more and more. When a single-pole ground fault occurs in the dc distribution network, a fault current flows through all the ground resistors and the fault point, and the fault current flowing through the fault point is the sum of the currents flowing through all the ground resistors R, as shown in fig. 1. Therefore, during operation with a fault, excessive ground resistance access to the system may result in increased operating losses of the dc distribution network, and may also result in excessive fault current and thus a continuous enlargement or worse fault plane.
Disclosure of Invention
In view of this, the present application provides a dc power distribution network, and an optimal control method and device thereof, which are used to avoid the problem of increased operation loss of the dc power distribution network during operation with a fault.
In order to achieve the above object, the following solutions are proposed:
a direct current distribution network comprises a main guide station and at least one secondary main guide station, wherein a load switch is connected in series on a grounding branch of the secondary main guide station, wherein:
when a single-pole ground fault occurs, controlling the load switch to be switched off so as to cut off the ground resistance of the secondary main control station;
and when the single-pole grounding fault is eliminated, controlling the load switch to be closed.
Optionally, when the master station exits due to a fault, the secondary master station with the highest priority is selected to upgrade to the master station.
An optimization control method is applied to a direct current safety and stability control system of a direct current power distribution network, the direct current power distribution network comprises a main control station and a plurality of secondary main control stations, and the main control station and the secondary main control stations are grounded through respective grounding resistors, and the optimization control method comprises the following steps:
when the direct current power distribution network has a single-pole grounding fault, controlling the grounding resistance of the secondary main control station to stop running;
and when the single-pole grounding fault is eliminated, controlling the grounding resistance of the secondary main control station to be put into operation.
Optionally, the method further comprises the steps of:
and when the master station exits due to faults, selecting a secondary master station with the highest priority to upgrade to the master station.
Optionally, the method further comprises the steps of:
and when the direct current power distribution network is split into more than two independent networks, controlling a secondary master station of a master grade in each network to be upgraded into a master station.
An optimization control device, which is applied to a direct current safety and stability control system of a direct current power distribution network, wherein the direct current power distribution network comprises a master station and a plurality of secondary master stations, and the master station and the secondary master stations are grounded through respective grounding resistors, the optimization control device comprises:
the first control module is configured to control the ground resistance of the secondary main station to stop running when the direct current power distribution network has a single-pole ground fault;
a second control module configured to control the ground resistance of the secondary master station to be put into operation when the unipolar ground fault is removed.
Optionally, the method further includes:
and the third control module is configured to select a secondary master station with the highest priority to upgrade to the master station after the master station exits due to faults.
Optionally, the method further includes:
and the fourth control module is configured to control the secondary master station of the master grade in each network to be upgraded to the master station when the direct current power distribution network is split into more than two independent networks.
According to the technical scheme, the direct current distribution network comprises a main control station and at least one secondary main control station, and a load switch is connected to a grounding branch of the secondary main control station in series. When a single-pole grounding fault occurs, the load switch is controlled to be switched off so as to cut off the grounding resistance of the secondary main control station; and when the single-pole grounding fault is eliminated, controlling the load switch to be closed. After the load switch of the secondary main leader station is disconnected, the grounding resistor on the grounding branch circuit is out of operation, and the current flowing through a fault point is reduced due to the fact that at least a part of the grounding resistor is out of operation, so that the increase of operation loss is avoided, and the situation that the fault plane is continuously enlarged or more serious due to the increase of the fault current can be avoided.
In addition, by avoiding the increase of the operation loss, the power exceeding the fixed voltage station can be prevented from flying first, so that the out-of-control occurrence of the fixed voltage station is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a single pole ground fault;
fig. 2 is a schematic diagram of a secondary master station of a dc distribution network according to an embodiment of the present application;
FIG. 3 is a flow chart of an optimization control method according to an embodiment of the present application;
FIG. 4 is a flow chart of another optimization control method according to an embodiment of the present application;
FIG. 5 is a flow chart of another optimization control method according to an embodiment of the present application;
FIG. 6 is a block diagram of an optimization control apparatus according to an embodiment of the present application;
FIG. 7 is a block diagram of another optimization control apparatus according to an embodiment of the present application;
FIG. 8 is a block diagram of another optimization control apparatus according to an embodiment of the present disclosure;
fig. 9 is a block diagram of another optimization control apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Example one
Fig. 2 is a schematic diagram of a secondary master station of a dc distribution network according to an embodiment of the present application.
The embodiment discloses a direct current power distribution network which comprises a main guide station and at least one secondary guide station, wherein the secondary guide stations are generally multiple and have priority orders. As shown in fig. 2, a load switch K is connected in series to the ground branch of the secondary master station, specifically, in series to a ground resistor on the ground branch.
When the direct current distribution network has a single-pole grounding fault, the power load switches on the grounding branches of all the secondary main control stations are controlled to be disconnected, namely, the grounding resistors connected with the secondary main control stations are quitted from operation. The current flowing through the fault point is also greatly reduced due to the disconnection of part of the ground resistance.
The method for judging the single-pole grounding fault comprises the following steps: differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetIs a single pole connectionGround faults identify a single pole voltage to ground setting. .
When the single-pole ground fault is removed, the load switch opened before the control is closed again to make the corresponding ground resistance work again.
It can be seen from the above technical solutions that, this embodiment provides a dc distribution network, which includes a primary station and at least one secondary station, where a load switch is connected in series to a ground branch of the secondary station. When a single-pole grounding fault occurs, the load switch is controlled to be switched off so as to cut off the grounding resistance of the secondary main control station; and when the single-pole grounding fault is eliminated, controlling the load switch to be closed. After the load switch of the secondary main leader station is disconnected, the grounding resistor on the grounding branch circuit is out of operation, and the current flowing through a fault point is reduced due to the fact that at least one part of the grounding resistor is out of operation, so that operation loss is prevented from being increased, and the situation that the fault surface is continuously enlarged or more serious due to the fact that the fault current is increased can be avoided.
And, by avoiding the increase of the operation loss, the power instability exceeding the constant voltage station can be avoided, thereby avoiding the out-of-control occurrence of the constant voltage station.
In addition, when the master station exits due to a fault, the direct-current power distribution network in the embodiment controls the secondary master station with the highest priority level in the other secondary master stations to upgrade, so that the secondary master station is upgraded to the master station to lead the direct-current power distribution network to continue to work normally.
Example two
Fig. 3 is a flowchart of an optimization control method according to an embodiment of the present application.
As shown in fig. 3, the optimization control method provided in this embodiment is applied to the dc power distribution network provided in the previous embodiment, and specifically applied to a dc safety and stability control system of the dc power distribution network, and the optimization control method specifically includes the following steps:
and S1, when the single-pole grounding fault occurs, controlling the grounding resistance of the secondary main station to stop running.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And S2, controlling the grounding resistance of the secondary main station to be put into operation after the unipolar grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
By removing at least a portion of the ground resistor from operation, the current flowing through the fault point is reduced, thereby avoiding increased operating losses and avoiding a continuous enlargement or a more severe fault plane caused by increased current flow.
EXAMPLE III
Fig. 4 is a flowchart of another optimization control method according to an embodiment of the present application.
As shown in fig. 4, the optimization control method provided in this embodiment is applied to the dc power distribution network provided in the above embodiment, and in particular, is applied to a dc safety and stability control system of the dc power distribution network, and the optimization control method specifically includes the following steps:
and S1, when the single-pole grounding fault occurs, controlling the grounding resistance of the secondary main station to stop running.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And S2, controlling the grounding resistance of the secondary main station to be put into operation after the unipolar grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
And S3, selecting a secondary master station to upgrade to the master station when the master station exits due to faults.
And when the master station exits due to faults, selecting a secondary master station with the highest priority from the rest of the secondary master stations for upgrading, and upgrading the secondary master station into the master station to continue working with the master direct-current power distribution network.
The fault here is not limited to a single-pole ground fault, but may be a short-circuit fault, a disconnection fault, a component-induced fault, or the like.
Example four
Fig. 5 is a flowchart of another optimization control method according to an embodiment of the present application.
As shown in fig. 5, the optimization control method provided in this embodiment is applied to the dc power distribution network provided in the above embodiment, and in particular, is applied to a dc safety and stability control system of the dc power distribution network, and the optimization control method specifically includes the following steps:
and S1, when the single-pole grounding fault occurs, controlling the grounding resistance of the secondary main station to stop running.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And S2, controlling the grounding resistance of the secondary main station to be put into operation after the unipolar grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
And S4, when the direct current distribution network is split, the secondary main station is controlled to be upgraded to the main station.
When the direct current distribution network is split into two or more independent networks due to faults, a secondary master station with the highest priority in each independent network is controlled to be upgraded into a master station so as to lead the independent network to continue working.
EXAMPLE five
Fig. 6 is a block diagram of an optimization control apparatus according to an embodiment of the present application.
As shown in fig. 6, the optimization control device provided in this embodiment is applied to the dc power distribution network provided in the above embodiment, and in particular, is applied to a dc safety and stability control system of the dc power distribution network, and specifically includes a first control module 10 and a second control module 20.
The first control module is used for controlling the grounding resistance of the secondary main control station to quit operation when a single-pole grounding fault occurs.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And the second control module is used for controlling the grounding resistance of the secondary main control station to be put into operation after the single-pole grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
By removing at least a portion of the ground resistor from operation, the current flowing through the fault point is reduced, thereby avoiding increased operating losses and avoiding a continuous enlargement or a more severe fault plane caused by increased current flow.
EXAMPLE six
Fig. 7 is a block diagram of another optimization control apparatus according to an embodiment of the present application.
As shown in fig. 7, the optimization control device provided in this embodiment is applied to the dc power distribution network provided in the above embodiment, and in particular, is applied to a dc safety and stability control system of the dc power distribution network, and specifically includes a first control module 10, a second control module 20, and a third control module 30.
The first control module is used for controlling the grounding resistance of the secondary main control station to quit operation when a single-pole grounding fault occurs.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And the second control module is used for controlling the grounding resistance of the secondary main control station to be put into operation after the single-pole grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
And the third control module is used for selecting one secondary master station to upgrade to the master station when the master station exits due to faults.
And when the master station exits due to faults, selecting a secondary master station with the highest priority from the rest of the secondary master stations for upgrading, and upgrading the secondary master station into the master station to continue working with the master direct-current power distribution network.
The fault here is not limited to a single-pole ground fault, but may be a short-circuit fault, a disconnection fault, a component-induced fault, or the like.
EXAMPLE seven
Fig. 8 is a block diagram of another optimization control apparatus according to an embodiment of the present application.
As shown in fig. 8, the optimization control device provided in this embodiment is applied to the dc power distribution network provided in the above embodiment, and in particular, is applied to a dc safety and stability control system of the dc power distribution network, and specifically includes a first control module 10, a second control module 20, and a fourth control module 40.
The first control module is used for controlling the grounding resistance of the secondary main control station to quit operation when a single-pole grounding fault occurs.
Namely, when a corresponding fault signal is received and the fact that the direct current power distribution network has a single-pole ground fault is judged according to the fault signal, the ground resistors of all secondary main control stations are controlled to quit operation. Since the ground branch of each secondary master station comprises a load switch and the ground resistor, the ground resistor is removed from operation by controlling the load switch to be disconnected.
Differential current DeltaI>IsetAnd U isdc>UdcminAnd | Up|<UdcpsetOr | Un|<Udcpset. Iset is a preset current parameter, Udc is interelectrode direct current voltage, Up is anode-to-ground direct current voltage, Un is cathode-to-ground direct current voltage, UdcminSet value for minimum interpolar voltage, UdcpsetA monopole voltage-to-ground setting is identified for the monopole ground fault.
And the second control module is used for controlling the grounding resistance of the secondary main control station to be put into operation after the single-pole grounding fault is eliminated.
After the single-pole ground fault is eliminated, the ground resistors of all secondary main control stations are controlled to be put into operation, namely, the load switches connected with the ground resistors are controlled to be closed, so that the ground branch is restored to the ground state.
And the fourth control module is used for controlling the secondary master station to be upgraded to the master station when the direct-current power distribution network is split.
When the direct current distribution network is split into two or more independent networks due to faults, a secondary master station with the highest priority in each independent network is controlled to be upgraded into a master station so as to lead the independent network to continue working.
In addition, the present embodiment may further include a third control module.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. A direct current distribution network is characterized by comprising a main guide station and at least one secondary main guide station, wherein a load switch is connected in series on a grounding branch of the secondary main guide station, wherein:
when a single-pole ground fault occurs, controlling the load switch to be switched off so as to cut off the ground resistance of the secondary main control station;
and when the single-pole grounding fault is eliminated, controlling the load switch to be closed.
2. The dc power distribution network of claim 1, wherein a secondary master station with a highest priority is selected to upgrade to a master station when the master station exits due to a fault.
3. An optimization control method is applied to a direct current safety and stability control system of a direct current power distribution network, the direct current power distribution network comprises a main pilot station and a plurality of secondary pilot stations, and the main pilot station and the secondary pilot stations are grounded through respective grounding resistors, and the optimization control method is characterized by comprising the following steps of:
when the direct current power distribution network has a single-pole grounding fault, controlling the grounding resistance of the secondary main control station to stop running;
and when the single-pole grounding fault is eliminated, controlling the grounding resistance of the secondary main control station to be put into operation.
4. The optimization control method of claim 3, further comprising the steps of:
and when the master station exits due to faults, selecting a secondary master station with the highest priority to upgrade to the master station.
5. The optimization control method of claim 3, further comprising the steps of:
and when the direct current power distribution network is split into more than two independent networks, controlling a secondary master station of a master grade in each network to be upgraded into a master station.
6. An optimization control device, which is applied to a direct current safety and stability control system of a direct current power distribution network, wherein the direct current power distribution network comprises a master station and a plurality of secondary master stations, and the master station and the secondary master stations are grounded through respective grounding resistors, the optimization control device comprises:
the first control module is configured to control the ground resistance of the secondary main station to stop running when the direct current power distribution network has a single-pole ground fault;
a second control module configured to control the ground resistance of the secondary master station to be put into operation when the unipolar ground fault is removed.
7. The optimizing control apparatus according to claim 6, further comprising:
and the third control module is configured to select a secondary master station with the highest priority to upgrade to the master station after the master station exits due to faults.
8. The optimizing control apparatus according to claim 6, further comprising:
and the fourth control module is configured to control the secondary master station of the master grade in each network to be upgraded to the master station when the direct current power distribution network is split into more than two independent networks.
CN201911380067.1A 2019-12-27 DC power distribution network and optimal control method and device thereof Active CN113054629B (en)

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CN103606911A (en) * 2013-10-12 2014-02-26 张家港智能电力研究院有限公司 Method for removing instantaneous short circuit earth faults of direct current line of flexible direct current power transmission system
CN103618305A (en) * 2013-11-27 2014-03-05 南方电网科学研究院有限责任公司 Method for allowing multi-end flexible direct-current power transmission system to conduct charged access through isolation switch
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