WO2018032643A1 - 一种直流开关站 - Google Patents

一种直流开关站 Download PDF

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Publication number
WO2018032643A1
WO2018032643A1 PCT/CN2016/107354 CN2016107354W WO2018032643A1 WO 2018032643 A1 WO2018032643 A1 WO 2018032643A1 CN 2016107354 W CN2016107354 W CN 2016107354W WO 2018032643 A1 WO2018032643 A1 WO 2018032643A1
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WO
WIPO (PCT)
Prior art keywords
branch
flow
branches
main breaker
switch station
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PCT/CN2016/107354
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English (en)
French (fr)
Inventor
高树同
康成
钟建英
程铁汉
吴军辉
毛志宽
魏义涛
Original Assignee
国家电网公司
平高集团有限公司
北京平高清大科技发展有限公司
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Application filed by 国家电网公司, 平高集团有限公司, 北京平高清大科技发展有限公司 filed Critical 国家电网公司
Publication of WO2018032643A1 publication Critical patent/WO2018032643A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/24—Circuit arrangements for boards or switchyards
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks

Definitions

  • the invention relates to the technical field of a direct current transmission power grid, in particular to a direct current switching station.
  • the core of the DC switch station is a DC circuit breaker.
  • a conventional mechanical DC circuit breaker based on a conventional switch a solid state DC circuit breaker based on pure power electronic devices, and both.
  • Combined hybrid DC circuit breaker The traditional mechanical DC circuit breaker has a long breaking time, and the loss of the solid-state DC circuit breaker is large.
  • the hybrid DC circuit breaker includes at least a low-loss through-current branch composed of a mechanical switch, an auxiliary converter module, and a main breaker composed of power electronics and a lightning arrester: during normal operation, the through-flow branch flows through most of (or All) DC current; when the DC breaker is required to trip, the main breaker cuts off the DC current and isolates the DC equipment connected to the DC breaker.
  • the DC switch station structure in the prior art is shown in FIG. 1.
  • the DC switch station includes three DC output ends, that is, an outgoing line 1, an outgoing line 2, and an outgoing line 3, and one between each two adjacent DC outgoing ends.
  • the DC circuit breaker includes a through branch and a main breaker branch.
  • the through branch is generally composed of a mechanical switch and an auxiliary commutation module.
  • the main breaker branch is generally composed of a lightning arrester/non-linear resistor, a buffer module, and a breaker.
  • the flow module is composed. It should be noted that the structures of the through-current branch and the main breaker branch are both prior art and are not described in detail herein.
  • each DC breaker is a through-flow branch connected in parallel with a main breaker branch.
  • the cost of the DC switch station mainly depends on the number of main circuit breakers.
  • the main circuit breaker composed of a large number of power electronic components has a special structure, and its price is more expensive than that of a general circuit breaker. If the main circuit breaker is used too much, it will cause DC.
  • the overall construction cost of the switchyard is very high, so the existing DC switchyard can not balance the relationship between performance and cost.
  • the embodiments of the present invention are expected to provide a DC switch station for solving the problem that the existing DC switch station cannot balance performance and cost requirements.
  • the technical solution proposed by the embodiment of the present invention is: a DC switch station, the DC switch station includes N DC outlet ends, N ⁇ 3, and a current flow is connected between adjacent DC outlet ends. a branch road, and each of the through-flow branches is connected in sequence to form a through-flow ring;
  • the DC switch station further includes M main breaker branches, M ⁇ N, the main breaker branch is connected between adjacent or non-adjacent DC outlet ends, and each DC outlet end is connected One or two main circuit breaker branches;
  • the through-flow branch is a through-flow branch for a DC circuit breaker
  • the main breaker branch is a transfer branch and an energy-consuming branch for the DC circuit breaker.
  • the number M of the main breaker branches is determined by the number N of the DC outlets:
  • the number N of the DC outlet ends when the number N of the DC outlet ends is an odd number, one of the N DC outlet ends connects the two main breaker branches, except the DC outlet end. Only one of the main breaker branches is connected to the DC outlet; when the DC outlet When the number of terminals N is even, each DC outlet end is connected to a main breaker branch.
  • the main breaker branch is connected between two adjacent DC outlet ends.
  • the DC switch station provided by the embodiment of the invention comprises a plurality of DC outlet ends, and a through-flow branch is connected between the adjacent DC outlet ends, and the through-flow branches are connected in series to form a through-flow loop, and the through-flow branch is used a branching branch of the DC circuit breaker; a main breaker branch is connected between the adjacent or non-adjacent DC outlet ends, and the main breaker branch is a branch branch and a power dissipation branch for the DC breaker road.
  • each DC outlet end of the DC switchyard can be directly connected to two through-flow branches, and each DC outlet end can be connected to at least one main breaker branch, and the current of any DC outlet in normal operation is equal to The sum of the currents of the two through-flow branches directly connected to the DC outlet in the DC switchyard.
  • the current of any DC outlet in normal operation is equal to The sum of the currents of the two through-flow branches directly connected to the DC outlet in the DC switchyard.
  • the number of main breaker branches in the DC switch station is smaller than the number of through-flow branches, and one or two of the main breaker branches are connected to each DC outlet end. Therefore, the DC switch station designed by the method has fewer main circuit breakers than the existing DC switch station, simplifies the overall structure of the DC switch station, and the control difficulty of the DC switch station is also greatly reduced; and because the structure of the main circuit breaker is special, The price is expensive, and reducing the number of main circuit breakers can greatly reduce the construction cost of the DC switch station, so that it can meet the performance requirements of the DC switch station and reduce the cost.
  • the main breaker branch is designed to be connected between two adjacent DC outlet ends.
  • the DC switch station of this structure is convenient for expansion when the outlet end is added, and the structure is relatively simple.
  • FIG. 1 is a schematic structural view of a DC switch station in the prior art
  • FIG. 2 is a schematic structural view of a DC switch station according to the first embodiment
  • FIG. 3 is a schematic structural view of a DC switch station according to a second embodiment
  • FIG. 4 is a schematic structural view of another DC switch station of the second embodiment
  • FIG. 5 is a schematic structural diagram of a DC switch station according to a third embodiment
  • FIG. 6 is a schematic structural view of another DC switch station of the third embodiment.
  • FIG. 7 is a schematic structural view of another DC switch station of the third embodiment.
  • FIG. 8 is a schematic structural view of another DC switch station of the third embodiment.
  • FIG. 9 is a schematic structural view of a DC switch station according to a fourth embodiment.
  • FIG. 10 is a schematic structural diagram of another DC switch station according to a fourth embodiment.
  • FIG. 11 is a schematic structural diagram of another DC switch station according to a fourth embodiment.
  • FIG. 12 is a schematic structural diagram of another DC switch station according to a fourth embodiment.
  • FIG. 13 is a schematic structural diagram of another DC switch station of the fourth embodiment.
  • the DC switch station proposed by the invention can reduce the use of the main circuit breaker branch, thereby reducing the construction cost of the switch station and still ensuring stable operation of the DC switch station.
  • connection structure and the number of devices of the DC switch station should meet the following conditions:
  • the number of the DC output ends in the DC switch station is N, where N is an integer not less than three, and a flow branch is connected between each two adjacent DC output ends, and the number of the flow branches is equal to
  • N is an integer not less than three
  • a flow branch is connected between each two adjacent DC output ends, and the number of the flow branches is equal to
  • N of the DC outlet ends, all the through-flow branches are connected in sequence to form a through-flow loop, that is, each DC outlet end is connected with two through-flow branches.
  • the current at the DC output is equal to the current sum of the two through-flow branches of the DC switch station that are connected to the direct end of the DC output.
  • the main breaker branch is connected between two adjacent or non-adjacent DC outlet ends, and the number M of the main breaker branches is smaller than the number N of the through branches, but each must be guaranteed At least one main breaker branch is connected to the DC outlet.
  • the through-flow branch referred to herein refers to a through-flow branch for a DC breaker
  • the main breaker branch refers to a branch branch and an energy-consuming branch for a DC breaker.
  • the present invention calculates the minimum main breaker branch that can be used according to the number N of the DC outlet ends. Way, namely:
  • the DC switch station includes the terminals of the (N+1) main breaker branch.
  • the DC switch station includes the terminals of the N main breaker branches, and each DC outlet end only There is a main circuit breaker branch connected.
  • the structure of the DC switch station is shown in Figure 2.
  • the three DC outlets are respectively connected to the three DC devices of the DC transmission network (conversion station, bus, transmission line, etc.) ) interconnection, the number of main breaker branches
  • the DC switch station includes terminals of four main circuit breaker branches, and each of the two adjacent DC output ends is connected with a through-flow branch, and all the through-flow branches are connected in sequence to form a through-flow ring.
  • a main breaker branch is connected between the adjacent DC outlet ends, and one main breaker branch is connected to each DC outlet end.
  • the through branch 12 is connected between the DC outlet ends 1 and 2
  • the through branch 23 is connected between the DC outlet ends 2 and 3
  • the through branch 31 is connected to the DC outlet 3 and Between 1
  • the main breaker branch 12 is connected between the DC outlet ends 1 and 2
  • the main breaker branch 23 is connected between the DC outlet ends 2 and 3.
  • the DC switch station of this structure can individually cut off any one of the three DC devices connected to the DC switch station, and can realize any one of the DC switch stations. Separate overhaul of the main breaker branch or any one of the through branches. The process is as follows:
  • the commutation function of the auxiliary commutation module in the through-flow branch 12 and the through-branch branch 23 is activated, and any one of the main breaker branches 12 and 23 is opened or simultaneously
  • the main breaker branches 12 and 23 are opened, the direct currents of the through branches 12 and 23 are transferred to either of the main breaker branches 12 and 23, or the direct currents of the through branches 12 and 23 are simultaneously Transfer to the two main circuit breaker branches 12 and 23, then disconnect the mechanical switches of the flow branches 12 and 31, and finally disconnect the main circuit breaker branches 12 and 23, thereby completing the DC device connected to the outgoing line 2 in the DC switching station.
  • the commutation function of the auxiliary converter module in the through-flow branches 23 and 31 is activated, and the main breaker branch 23 is opened, and the DC currents of the through-branch branches 23 and 31 are turned on. Transfer to the main breaker branch 23, then disconnect the mechanical switches of the through branches 23 and 31, and finally disconnect the main breaker branch 23, thereby completing the isolation of the DC equipment connected to the outgoing line 3 in the DC switching station.
  • the DC switch station When the DC switch station completes the isolation of the DC equipment connected to the outgoing line 2, and the system requires reconnection of the DC equipment, first open any one of the main breaker branches 12 and 23 or simultaneously open the main breaker.
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 3, and the system requires reconnection of the DC device, first open the main breaker branch 23, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary converter module in the through-flow branches 23 and 31 is turned on, and then the mechanical switches of the through-flow branches 23 and 31 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 23 to the through branches 23 and 31, the DC switch station completes the reconnection of the DC device connected to the outgoing line 3.
  • the commutation function of the auxiliary commutation module in the through-flow branch 31 is activated, and the direct current of the through-branch branch 31 is transferred to the through-flow branches 12 and 23, and then The mechanical switch of the through-flow branch 31 is disconnected, and finally the isolating knife gates at both ends of the through-flow branch 31 are disconnected, thereby completing the isolation of the through-current branch 31 by the DC switching station.
  • the two main circuit breaker branches can also be connected between the DC outlet ends 1 and 2, the DC outlet ends 1 and 3, or the two main breaker branches can be connected to the DC outlet ends 2 and 3. Between the DC and the output terminals 1 and 3.
  • the structure of the DC switch station is shown in Figure 3.
  • the four DC outlets are respectively connected to the four DC devices of the DC transmission network (conversion station, bus, transmission line, etc.) ) interconnection, the number of main breaker branches
  • the DC switch station includes terminals of four main circuit breaker branches, and one through-flow branch is connected between each two adjacent DC output ends, and all the through-flow branches are connected in sequence to form a through-flow ring.
  • a main breaker branch is connected between adjacent DC outlet ends, and one main breaker branch is connected to each DC outlet end.
  • the through branch 12 is connected between the DC outlet ends 1 and 2
  • the through branch 23 is connected between the DC outlet ends 2 and 3
  • the through branch 34 is connected to the DC outlet 3 and 4
  • the through-flow branch 41 is connected between the DC outlet ends 4 and 1
  • the main breaker branch 13 is connected between the DC outlet ends 1 and 3
  • the main breaker branch 24 is connected to the DC outlet 2 and Between 4.
  • the DC switch station of this structure can separately cut off any one of the four DC devices connected to the DC switch station, and can realize the separate maintenance of any one of the main circuit breaker branches or any one of the through-flow branches of the DC switch station. The process is as follows:
  • the commutation function of the auxiliary converter module in the through-flow branches 12 and 23 is activated, and the main breaker branch 24 is opened, and the DC currents of the through-circuit branches 12 and 23 are turned on. Transfer to the main breaker branch 24, then disconnect the mechanical switches of the through branches 12 and 23, and finally disconnect the main breaker branch 24, thereby completing the isolation of the DC equipment connected to the outlet 2 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 23 and 34 is activated, and the main breaker branch 13 is opened, and the DC currents of the through-branch branches 23 and 34 are turned on. Transfer to the main breaker branch 13 , then disconnect the mechanical switches of the through branches 23 and 34 , and finally disconnect the main breaker branch 13 , thereby completing the isolation of the DC device connected to the outlet 3 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 41 and 34 is activated, and the main breaker branch 24 is opened, and the DC currents of the through-flow branches 41 and 34 are turned on. Transfer to the main breaker branch 24, then disconnect the mechanical switches of the through branches 41 and 34, and finally disconnect the main breaker branch 24, thereby completing the isolation of the DC equipment connected to the outlet 4 in the DC switching station.
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 2, and the system requires reconnection of the DC device, first open the main circuit breaker branch 24, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary converter module in the through-flow branches 12 and 23 is turned on, and then the mechanical switches of the through-flow branches 12 and 23 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 24 to the through branches 12 and 23, the DC switch station completes the reconnection of the DC device connected to the outgoing line 2;
  • the main circuit breaker branch 13 is first opened, and the DC current flowing through the DC device does not exceed DC.
  • the through-flow function of the auxiliary commutation module in the through-flow branches 23 and 34 is turned on, and then the mechanical switches of the through-flow branches 23 and 34 are closed, when the direct current flows through
  • the DC switch station completes the reconnection of the DC device connected to the outgoing line 3;
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 4, and the system requires reconnection of the DC device, first open the main breaker branch 24, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary commutation module in the through-flow branches 34 and 41 is opened, and then the mechanical switches of the through-flow branches 34 and 41 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 24 to the through branches 34 and 41, the DC switch station completes the weight of the DC device connected to the outgoing line 4. New connection.
  • the commutation function of the auxiliary commutation module in the through-flow branch 34 is activated, and the direct current of the through-current branch 34 is transferred to the through-flow branches 41 and 23, and then Disconnecting the mechanical switch of the through-flow branch 34, and finally disconnecting the isolating knife gates at both ends of the through-flow branch 34, thereby completing the isolation of the DC branch station from the through-flow branch 34;
  • the commutation function of the auxiliary commutation module in the through-flow branch 41 is started, and the direct current of the through-flow branch 41 is transferred to the through-flow branches 12 and 34, and then The mechanical switch of the through-flow branch 41 is disconnected, and finally the isolating knife gates at both ends of the through-flow branch 41 are disconnected, thereby completing the isolation of the through-current branch 41 by the DC switching station.
  • the main breaker branch is connected between two non-adjacent DC outlet ends.
  • the main breaker branch can also be connected to two adjacent DC outlet ends.
  • Between the main breaker branch 12 is connected between the DC outlet ends 1 and 2, and the main breaker branch 34 is connected between the DC outlet ends 3 and 4.
  • the DC switch station of this structure has a simple structure, The scalability is relatively good.
  • the number of main circuit breakers in the DC switch station of this structure is smaller than that of the conventional DC switch station. Therefore, the construction of the DC switch station can be reduced to some extent. cost.
  • the structure of the DC switch station is shown in Figure 5.
  • the five DC outlets are respectively connected to the five DC devices of the DC transmission grid (conversion station, bus, transmission line, etc.) ) interconnection, the number of main breaker branches
  • the DC switch station includes terminals of six main circuit breaker branches, and one through-flow branch is connected between each two adjacent DC output ends, and all the flow branches are connected in sequence to form a through-flow ring.
  • a main breaker branch is connected between the adjacent or non-adjacent DC outlet ends, and one main breaker branch is connected to each DC outlet end.
  • the through branch 12 is connected between the DC outlet ends 1 and 2
  • the through branch 23 is connected between the DC outlet ends 2 and 3
  • the through branch 34 is connected to the DC outlet 3 and 4
  • the through branch 45 is connected between the DC outlet ends 4 and 5
  • the through branch 51 is connected between the DC outlet ends 5 and 1
  • the main breaker branch 13 is connected to the DC outlet ends 1 and 3
  • the main breaker branch 24 is connected between the DC outlet ends 2 and 4
  • the main breaker branch 51 is connected between the DC outlet ends 5 and 1.
  • the commutation function of the auxiliary converter module in the through-flow branches 12 and 51 is activated, and any one of the main breaker branches 13 and 51 is turned on or simultaneously turned on.
  • the main breaker branches 13 and 51 transfer the direct currents of the through branches 12 and 51 to either of the main breaker branches 13 and 51, or simultaneously transfer the direct currents of the through branches 12 and 51. Go to the two main breaker branches 13 and 51, then disconnect the mechanical switches of the through-flow branches 12 and 51, and finally disconnect the main breaker branches 13 and 51, thereby completing the DC equipment connected to the outlet 1 in the DC switching station. isolation;
  • the commutation function of the auxiliary converter module in the through-flow branches 12 and 23 is activated, and the main breaker branch 24 is opened, and the DC currents of the through-circuit branches 12 and 23 are turned on. Transfer to the main breaker branch 24, then disconnect the mechanical switches of the through branches 12 and 23, and finally disconnect the main breaker branch 24, thereby completing the isolation of the DC equipment connected to the outlet 2 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 23 and 34 is activated, and the main breaker branch 13 is opened, and the DC currents of the through-branch branches 23 and 34 are turned on. Transfer to the main breaker branch 13 , then disconnect the mechanical switches of the through branches 23 and 34 , and finally disconnect the main breaker branch 13 , thereby completing the isolation of the DC device connected to the outlet 3 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 34 and 45 is activated, and the main breaker branch 24 is opened, and the DC currents of the through-branch branches 34 and 45 are turned on. Transfer to the main breaker branch 24, then disconnect the mechanical switches of the through branches 34 and 45, and finally disconnect the main breaker branch 24, thereby completing the isolation of the DC equipment connected to the outlet 4 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 45 and 51 is started, and the main breaker branch 51 is opened, and the DC currents of the through-flow branches 45 and 51 are turned on. Transfer to the main breaker branch 51, and then disconnect the mechanical opening of the through branches 45 and 51 Off, the main breaker branch 51 is finally disconnected, thereby completing the isolation of the DC device connected to the outlet 5 in the DC switch station.
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 2, and the system requires reconnection of the DC device, first open the main circuit breaker branch 24, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary converter module in the through-flow branches 12 and 23 is turned on, and then the mechanical switches of the through-flow branches 12 and 23 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 24 to the through branches 12 and 23, the DC switch station completes the reconnection of the DC device connected to the outgoing line 2;
  • the main circuit breaker branch 13 is first opened, and the DC current flowing through the DC device does not exceed DC.
  • the through-flow function of the auxiliary commutation module in the through-flow branches 23 and 34 is turned on, and then the mechanical switches of the through-flow branches 23 and 34 are closed, when the direct current flows through
  • the DC switch station completes the reconnection of the DC device connected to the outgoing line 3;
  • the DC switch station When the DC switch station completes the isolation of the DC equipment connected to the outgoing line 4, and the system requires reconnection of the DC equipment, first open the main breaker branch 24 and flow through the DC After the DC current of the device does not exceed the DC switch station overcurrent protection setting and remains for a certain period of time, the through-flow function of the auxiliary converter module in the through-flow branches 34 and 45 is opened, and then the mechanical switches of the through-flow branches 34 and 45 are closed. After the DC current flowing through the DC device is completely transferred from the main breaker branch 24 to the through branches 34 and 45, the DC switch station completes reconnection of the DC device connected to the outlet 4;
  • the DC switch station When the DC switch station completes the isolation of the DC equipment connected to the outgoing line 5, and the system requires reconnection of the DC equipment, first open the main breaker branch 51, and the DC current flowing through the DC equipment does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary commutation module in the through-flow branches 45 and 51 is turned on, and then the mechanical switches of the through-flow branches 45 and 51 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 51 to the through branches 45 and 51, the DC switch station completes the reconnection of the DC device connected to the outgoing line 5.
  • the commutation function of the auxiliary commutation module in the through-flow branch 23 is activated, and the direct current of the through-branch branch 23 is transferred to the through-branch branch 12 and the through-flow branch 34, then the mechanical switch of the through-flow branch 23 is disconnected, and finally the isolating knife gate at both ends of the through-flow branch 23 is disconnected, thereby completing the isolation of the DC branch station to the through-flow branch 23;
  • the commutation function of the auxiliary commutation module in the through-flow branch 34 is activated, and the direct current of the through-current branch 34 is transferred to the through-flow branch 45 and the through-flow branch 23, then disconnect the mechanical switch of the through-flow branch 34, and finally disconnect the isolating knife gates at both ends of the through-flow branch 34, thereby completing the isolation of the DC branch station to the through-flow branch 34;
  • the auxiliary switch in the through-flow branch 45 is activated.
  • the commutation function of the flow module transfers the direct current of the through-flow branch 45 to the through-flow branch 51 and the through-flow branch 34, then disconnects the mechanical switch of the through-flow branch 45, and finally disconnects the through-flow branch 45.
  • the isolating knife gate of the end thereby completing the isolation of the DC branch station to the through branch 45;
  • the commutation function of the auxiliary commutation module in the through-flow branch 51 is activated, and the direct current of the through-flow branch 51 is transferred to the through-flow branch 45 and the through-flow branch On the 12th, the mechanical switch of the through-flow branch 51 is then disconnected, and finally the isolating knife gates at both ends of the through-flow branch 51 are disconnected, thereby completing the isolation of the through-current branch 51 by the DC switching station.
  • the main breaker branch is connected between the non-adjacent DC outlet ends, that is, the main breaker branch 13 is connected between the DC outlet ends 1 and 3, and the main breaker
  • the branch 24 is connected between the DC outlet ends 2 and 4
  • the main breaker branch 35 is connected between the DC outlet ends 3 and 5.
  • the main breaker branch is connected between two non-adjacent DC outlet ends.
  • the main breaker branch is connected between adjacent DC outlets. That is, the main breaker branch 12 is connected between the DC outlet ends 1 and 2, the main breaker branch 34 is connected between the DC outlet ends 3 and 4, and the main breaker branch 51 is connected to the DC outlet ends 5 and 1. between.
  • the DC switch station of this structure has a simple structure and relatively good scalability.
  • the main breaker branch is connected between adjacent or non-adjacent DC outlet ends, that is, the main breaker branch 12 is connected between the DC outlet ends 1 and 2,
  • the circuit breaker branch 34 is connected between the DC outlet ends 3 and 4
  • the main breaker branch 35 is connected between the DC outlet ends 3 and 5.
  • the number of main breakers in the DC switch station of this structure is relatively The number of main circuit breakers in the conventional DC switch station is small, so the construction cost of the DC switch station can be greatly reduced.
  • the structure of the DC switch station is shown in Figure 9.
  • the six DC outlets are respectively connected with the six DC devices of the DC transmission network (conversion station, bus, transmission line, etc.) ) interconnection, the number of main breaker branches
  • the DC switch station includes terminals of six main circuit breaker branches, and one through-flow branch is connected between each two adjacent DC output ends, and all the flow branches are connected in sequence to form a through-flow ring.
  • a main breaker branch is connected between the adjacent or non-adjacent DC outlet ends, and one main breaker branch is connected to each DC outlet end.
  • the through branch 12 is connected between the DC outlet ends 1 and 2
  • the through branch 23 is connected between the DC outlet ends 2 and 3
  • the through branch 34 is connected to the DC outlet 3 and 4
  • the through branch 45 is connected between the DC outlet ends 4 and 5
  • the through branch 56 is connected between the DC outlet ends 5 and 6
  • the through branch 61 is connected to the DC outlet ends 6 and 1.
  • the main breaker branch 12 is connected between the DC outlet ends 1 and 2
  • the main breaker branch 35 is connected between the DC outlet ends 3 and 5
  • the main breaker branch 46 is connected to the DC outlet ends 4 and 6. between.
  • the DC switch station of this structure can separately cut off any one of the five DC devices connected to the DC switch station, and can realize the separate maintenance of any one of the main breaker branches or any one of the through-flow branches of the DC switch station. The process is as follows:
  • the commutation function of the auxiliary converter module in the through-flow branches 12 and 23 is activated, and the main breaker branch 12 is opened, and the DC currents of the through-circuit branches 12 and 23 are turned on. Transfer to the main breaker branch 12, then disconnect the mechanical switches of the through branches 12 and 23, and finally disconnect the main breaker branch 12, thereby completing the isolation of the DC equipment connected to the outlet 2 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 23 and 34 is activated, and the main breaker branch 35 is opened, and the DC currents of the through-branch branches 23 and 34 are turned on. Transfer to the main breaker branch 35, then disconnect the mechanical switches of the through branches 23 and 34, and finally disconnect the main breaker branch 35, thereby completing the isolation of the DC equipment connected to the outlet 3 in the DC switch station;
  • the commutation function of the auxiliary converter module in the through-flow branches 34 and 45 is started, and the main breaker branch 46 is opened, and the DC currents of the through-branch branches 34 and 45 are turned on. Transfer to the main breaker branch 46, then disconnect the mechanical switches of the through branches 34 and 45, and finally disconnect the main breaker branch 46, thereby completing the isolation of the DC equipment connected to the outlet 4 in the DC switch station;
  • the commutation function of the auxiliary commutation module in the through-flow branches 45 and 56 is activated, and the main breaker branch 35 is opened, and the DC currents of the through-flow branches 45 and 56 are turned on. Transfer to the main breaker branch 35, then disconnect the mechanical switches of the through-flow branches 45 and 56, and finally disconnect the main breaker branch 35, thereby completing the isolation of the DC equipment connected to the outgoing line 5 in the DC switching station;
  • the commutation function of the auxiliary commutation module in the through-flow branches 61 and 56 is activated, and the main breaker branch 46 is opened, and the through-branch branches 61 and 56 are The DC current is transferred to the main breaker branch 46, the mechanical switches of the through branches 61 and 56 are then disconnected, and the main breaker branch 46 is finally opened, thereby completing the isolation of the DC equipment connected to the outgoing line 6 in the DC switching station.
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 2, and the system requires reconnection of the DC device, first open the main circuit breaker branch 12, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary converter module in the through-flow branches 12 and 23 is turned on, and then the mechanical switches of the through-flow branches 12 and 23 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 12 to the through branches 12 and 23, the DC switch station completes the reconnection of the DC device connected to the outgoing line 2;
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 3, and the system requires reconnection of the DC device, first open the main breaker branch 35, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary commutation module in the through-flow branches 23 and 34 is turned on, and then the mechanical switches of the through-flow branches 23 and 34 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 35 to the through branches 23 and 34, the DC switch station completes the reconnection of the DC device connected to the outgoing line 3;
  • the system is shortly When reconnecting the DC device, first open the main breaker branch 46. After the DC current flowing through the DC device does not exceed the DC switch station overcurrent protection setting and maintain a certain time, the through branch 34 is opened. The through-flow function of the auxiliary commutation module in 45, and then closing the mechanical switches of the through-flow branches 34 and 45, when the direct current flowing through the direct current device is completely transferred from the main breaker branch 46 to the through-branch branch 34 and After 45, the DC switch station completes the reconnection of the DC device connected to the outgoing line 4;
  • the DC switch station When the DC switch station completes the isolation of the DC device connected to the outgoing line 5, and the system requires reconnection of the DC device, first open the main circuit breaker branch 35, and the DC current flowing through the DC device does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary commutation module in the through-flow branches 45 and 56 is turned on, and then the mechanical switches of the through-flow branches 45 and 56 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 35 to the through branches 45 and 56, the DC switch station completes the reconnection of the DC device connected to the outgoing line 5;
  • the DC switch station When the DC switch station completes the isolation of the DC equipment connected to the outgoing line 6 and the system requires reconnection of the DC equipment, first open the main breaker branch 46, and the DC current flowing through the DC equipment does not exceed DC. After the switch station overcurrent protection setting is maintained for a certain period of time, the through-flow function of the auxiliary commutation module in the through-flow branches 56 and 61 is turned on, and then the mechanical switches of the through-flow branches 56 and 61 are closed, when the direct current flows through After the DC current of the device is completely transferred from the main breaker branch 46 to the through branches 56 and 61, the DC switch station completes the reconnection of the DC device connected to the outgoing line 6.
  • the auxiliary switch in the through-flow branch 23 is activated.
  • the commutation function of the flow module transfers the direct current of the through-flow branch 23 to the through-flow branch 12 and the through-flow branch 34, then disconnects the mechanical switch of the through-flow branch 23, and finally disconnects the through-flow branch 23
  • the isolation knife of the end at this point, thereby completing the isolation of the DC branch station to the through branch 23;
  • the commutation function of the auxiliary commutation module in the through-flow branch 34 is activated, and the direct current of the through-current branch 34 is transferred to the through-flow branch 45 and the through-flow branch 23, then disconnect the mechanical switch of the through-flow branch 34, and finally disconnect the isolating knife gates at both ends of the through-flow branch 34, thereby completing the isolation of the DC branch station to the through-flow branch 34;
  • the commutation function of the auxiliary converter module in the through-flow branch 45 is started, and the direct current of the through-flow branch 45 is transferred to the through-flow branch 56 and the through-flow branch 34, then disconnect the mechanical switch of the through-flow branch 45, and finally disconnect the isolating knife gates at both ends of the through-flow branch 45, thereby completing the isolation of the DC branch station to the through-flow branch 45;
  • the commutation function of the auxiliary commutation module in the through-flow branch 61 is activated, and the direct current of the through-branch branch 61 is transferred to the through-branch branch 12 and the through-flow branch At 56, the mechanical switch of the through-flow branch 61 is then disconnected, and finally the isolating knife gates at both ends of the through-flow branch 61 are disconnected, thereby completing the isolation of the DC branch station from the through-flow branch 61.
  • the main breaker branch is connected between the non-adjacent DC outlet ends, that is, the main breaker branch 14 is connected between the DC outlet ends 1 and 4, and the main disconnection
  • the branch circuit 25 is connected between the DC output terminals 2 and 5
  • the main circuit breaker branch 36 is connected between the DC output terminals 3 and 6.
  • the main breaker branch is connected between the non-adjacent DC outlet ends, that is, the main breaker branch 14 is connected between the DC outlet ends 1 and 4, and the main breaker branch 26 is connected Between the DC outlet ends 2 and 6, the main breaker branch 35 is connected between the DC outlet ends 3 and 5.
  • the main breaker branch is connected between two non-adjacent DC outlet ends.
  • the main breaker branch is connected between adjacent DC outlets. That is, the main breaker branch 12 is connected between the DC outlet ends 1 and 2, the main breaker branch 34 is connected between the DC outlet ends 3 and 4, and the main breaker branch 56 is connected to the DC outlet ends 5 and 6. between.
  • the DC switch station of this structure has a simple structure and relatively good scalability.
  • the main breaker branch is connected between adjacent or non-adjacent DC outlet ends, that is, the main breaker branch 12 is connected between the DC outlet ends 1 and 2,
  • the circuit breaker branch 36 is connected between the DC outlet ends 3 and 6, and the main breaker branch 45 is connected between the DC outlet ends 4 and 5.
  • the number of main breakers in the DC switch station of this structure is smaller than that of the conventional DC switch station, so the DC can be greatly reduced. Construction cost of the switchyard.
  • each DC output end of the DC switch station is directly connected to two through-flow branches, and each DC output end can be connected to at least one main breaker.
  • the branches are connected, and the current of any one of the DC outlets in normal operation is equal to the current sum of the two through-flow branches directly connected to the DC outlets in the DC switching station.
  • the number of main breaker branches in the DC switch station is smaller than the number of the through-flow branches, and one or two of the main breaker branches are connected to each DC outlet end.
  • the DC switch station designed by the method has fewer main circuit breakers than the existing DC switch station, simplifies the overall structure of the DC switch station, and the control difficulty of the DC switch station is also greatly reduced; and because the structure of the main circuit breaker is special, The price is expensive, and reducing the number of main circuit breakers can greatly reduce the construction cost of the DC switch station, so that it can meet the performance requirements of the DC switch station and reduce the cost.

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Abstract

一种直流开关站，包括N（N≥3）个直流出线端和M（M<N）个主断路器支路，相邻的直流出线端之间连接有通流支路，且各通流支路首尾顺次相连成一个通流环，主断路器支路连接在相邻或非相邻的直流出线端之间，且每个直流出线端都连接有一个或两个主断路器支路；所述通流支路是用于直流断路器的通流支路，所述主断路器支路是用于直流断路器的转移支路和耗能支路。

Description

一种直流开关站 技术领域
本发明涉及直流输电电网技术领域，特别是一种直流开关站。
背景技术
在直流输电电网中，与直流开关站相连接的一个或者若干个直流设备需要维修或者隔离时，直流开关站可以将该直流设备切断，而不影响与直流开关站连接的其它直流设备。直流开关站的核心为直流断路器，目前直流断路器的技术方案主要有3种类型，分别是基于常规开关的传统机械式直流断路器、基于纯电力电子器件的固态直流断路器和基于二者结合的混合式直流断路器。传统机械式直流断路器分断时间较长，固态直流断路器的损耗较大，随着高压大容量半导体器件的发展，结合常规机械开关和电力电子器件特点的混合式直流断路器技术得到快速发展。混合式直流断路器至少包含由机械开关、辅助换流模块组成的低损耗通流支路和由电力电子器件、避雷器组成的主断路器：正常运行时，通流支路流过大部分(或者全部)的直流电流；需要直流断路器跳闸时，主断路器切断直流电流并隔离与直流断路器相连的直流设备。
现有技术上中的直流开关站结构如图1所示，直流开关站包含三个直流出线端，即出线1、出线2和出线3，每两个相邻直流出线端之间都设有一个直流断路器。该直流断路器包括一个通流支路和一个主断路器支路，通流支路一般由机械开关和辅助换流模块构成，主断路器支路一般由避雷器/非线性电阻、缓冲模块和断流模块构成。需要说明的是，关于通流支路和主断路器支路的结构都属于现有技术，故而不在此进行详细介绍。
可见，现有的基于混合式直流断路器的直流开关站需要大量的直流断 路器，每个直流断路器均为一个通流支路并联一个主断路器支路。直流开关站的出线规模越多，直流开关站的结构、运行、控制就会越复杂，系统整体性能也会下降。另外直流开关站的成本主要取决于主断路器的数量，由大量电力电子器件组成的主断路器结构特殊，相应的其价格比一般的断路器昂贵，如果主断路器运用过多，会导致直流开关站整体的建造成本很高，所以，现有的直流开关站还不能很好的平衡性能、成本之间的关系。
发明内容
本发明实施例期望提供一种直流开关站，用于解决现有直流开关站无法兼顾性能和成本要求的问题。
为解决上述问题，本发明实施例提出的技术解决方案是：一种直流开关站，所述直流开关站包括N个直流出线端，N≥3，相邻的直流出线端之间连接有通流支路，且各通流支路首尾顺次相连成一个通流环；
所述直流开关站还包括M个主断路器支路，M＜N，所述主断路器支路连接在相邻或非相邻的直流出线端之间，且每个直流出线端都连接有一个或两个主断路器支路；
所述通流支路是用于直流断路器的通流支路，所述主断路器支路是用于直流断路器的转移支路和耗能支路。
作为一种实施方式，所述主断路器支路的个数M由所述直流出线端个数N决定：
当直流出线端个数N为奇数时，所述主断路器支路的个数M＝X＝(N+1)/2；
当直流出线端个数N为偶数时，所述主断路器支路的个数M＝X＝N/2。
作为一种实施方式，当所述直流出线端个数N为奇数时，N个直流出线端中的一个直流出线端连接两个所述主断路器支路，除所述直流出线端以外的其他直流出线端都只连接一个所述主断路器支路；当所述直流出线 端个数N为偶数时，每个直流出线端都连接一个主断路器支路。
作为一种实施方式的，所述主断路器支路均连接在两相邻的所述直流出线端之间。
本发明实施例提供的直流开关站包括若干直流出线端，相邻直流出线端之间连接有通流支路，由通流支路首尾顺次相接构成通流环，通流支路是用于直流断路器的通流支路；在相邻或非相邻的直流出线端之间连接有主断路器支路，主断路器支路是用于直流断路器的转移支路和耗能支路。这样能够实现直流开关站的每个直流出线端与两个通流支路直接连接，每个直流出线端都能至少与一个主断路器支路相连接，正常运行时任意一个直流出线的电流等于直流开关站内与直流出线直接连接的两个通流支路的电流和。这样不仅能够减小每个通流支路上的额定通流电流，而且实现了对任意一个通流支路进行单独检修时，直流开关站的其他直流出线端均不停电。
直流开关站中主断路器支路的个数小于通流支路的个数，且每个直流出线端都连接有一个或两个所述主断路器支路。因此该方法设计的直流开关站比现有直流开关站中主断路器数量少，简化了直流开关站的整体结构，从而直流开关站的控制难度也大大降低；又由于主断路器的结构特殊，其价格昂贵，减少主断路器的数量能够很大程度上减少直流开关站的建造成本，所以，这样既能满足直流开关站的性能要求和又可以降低成本。
将主断路器支路均设计为连接在两相邻的直流出线端之间，这种结构的直流开关站便于在增加出线端时进行扩展，结构相对简单。
附图说明
图1为现有技术中的直流开关站结构示意图；
图2为第一实施例的一种直流开关站结构示意图；
图3为第二实施例的一种直流开关站结构示意图；
图4为第二实施例的另一种直流开关站结构示意图；
图5为第三实施例的一种直流开关站结构示意图；
图6为第三实施例的另一种直流开关站结构示意图；
图7为第三实施例的另一种直流开关站结构示意图；
图8为第三实施例的另一种直流开关站结构示意图；
图9为第四实施例的一种直流开关站结构示意图；
图10为第四实施例的另一种直流开关站结构示意图；
图11为第四实施例的另一种直流开关站结构示意图；
图12为第四实施例的另一种直流开关站结构示意图；
图13为第四实施例的另一种直流开关站结构示意图。
具体实施方式
下面结合附图对本发明的技术方案进行详细说明。
本发明提出的直流开关站能够减少主断路器支路的使用，进而可以降低开关站的建造成本，并且仍能够保证直流开关站的稳定运行。
现为了保证直流开关站不仅能够实现单独切断直流设备和单独检修通流支路的功能，且能够降低直流开关站的成本，直流开关站的连接结构和设备数量，应满足以下条件：
直流开关站中直流出线端的个数为N，其中N为不小于三的整数，每两个相邻的直流出线端之间都连接有一个通流支路，则通流支路的个数等于直流出线端的个数N，所有通流支路首尾顺次相连构成一个通流环，即每个直流出线端都连接有两个通流支路。正常运行时，直流出线端的电流等于直流开关站中与直流出线直接端连接的两个通流支路的电流和。
直流开关站中主断路器支路连接在两个相邻或者非相邻的直流出线端之间，主断路器支路的个数M小于通流支路的个数N，但必须保证每个直流出线端都至少连接有一个主断路器支路。
这里所说的通流支路是指用于直流断路器的通流支路，所说的主断路器支路是指用于直流断路器的转移支路和耗能支路。
作为一种实施方式，在保证直流开关站正常工作的情况下为了更加节约成本，减少主断路器支路的使用，本发明依据直流出线端个数N计算出能够使用最少的主断路器支路的方式，即：
当直流出线端个数N为奇数时，主断路器支路的个数M＝X＝(N+1)/2，直流开关站包含(N+1)个主断路器支路的接线端，同时会存在一个直流出线端连接有两个主断路器支路，其余直流出线端都只连接有一个主断路器支路；
当直流出线端个数N为偶数时，主断路器支路的个数M＝X＝N/2，直流开关站包含N个主断路器支路的接线端，同时每个直流出线端均只连接有一个主断路器支路。
下面举出几个具体的例子进行说明。
第一实施例：
当直流开关站的直流出线端个数N＝3时，直流开关站结构如图2所示，三个直流出线端分别与直流输电电网的三个直流设备(换流站、母线、输电线路等)互连，主断路器支路的个数
Figure PCTCN2016107354-appb-000001
直流开关站包含4个主断路器支路的接线端，每两个相邻直流出线端之间都连接有一个通流支路，所有通流支路首尾顺次相连构成一个通流环，相邻的直流出线端之间连接有主断路器支路，且每个直流出线端都连接有一个主断路器支路。
如图2所示，通流支路12连接在直流出线端1和2之间，通流支路23连接在直流出线端2和3之间，通流支路31连接在直流出线端3和1之间；主断路器支路12连接在直流出线端1和2之间，主断路器支路23连接在直流出线端2和3之间。这种结构的直流开关站能够实现单独切断与直流开关站相连的三个直流设备中的任意一个，且能够实现直流开关站任意一 个主断路器支路或者任意一个通流支路的单独检修。过程如下：
(1)当直流开关站连接的直流输电电网正常运行时，直流开关站的三个通流支路的机械开关闭合，三个通流支路流过大部分(或者全部)的直流电流。
(2)当需要切断出线1连接的直流设备时，启动通流支路12和31中的辅助换流模块的换流功能，并开通主断路器支路12，将通流支路12和31的直流电流转移到主断路器支路12，随后断开通流支路12和31的机械开关，最后断开主断路器支路12，从而完成直流开关站内与出线1连接的直流设备的隔离；
当需要切断出线2连接的直流设备时，启动通流支路12和通流支路23中的辅助换流模块的换流功能，并开通主断路器支路12和23中的任意一个或者同时开通主断路器支路12和23，将通流支路12和23的直流电流转移到主断路器支路12和23中的任意一个上，或者将通流支路12和23的直流电流同时转移到两主断路器支路12和23上，随后断开通流支路12和31的机械开关，最后断开主断路器支路12和23，从而完成直流开关站内与出线2连接的直流设备的隔离；
当需要切断出线3连接的直流设备时，启动通流支路23和31中的辅助换流模块的换流功能，并开通主断路器支路23，将通流支路23和31的直流电流转移到主断路器支路23，随后断开通流支路23和31的机械开关，最后断开主断路器支路23，从而完成直流开关站内与出线3连接的直流设备的隔离。
(3)当直流开关站完成对与出线1连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路12，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，启动通流支路12和31中辅助换流模块的通流功能，然后闭合通流支路12和 31的机械开关，当流过直流设备的直流电流完全从主断路器支路12转移至通流支路12和31后，直流开关站完成对与出线1连接的直流设备的重新连接；
当直流开关站完成对与出线2连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路12和23中的任意一个或者同时开通主断路器支路12和23，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和23中辅助换流模块的通流功能，然后闭合通流支路12和23的机械开关，当流过直流设备的直流电流完全从主断路器支路12和23转移至通流支路12和23后，直流开关站完成对与出线2连接的直流设备的重新连接；
当直流开关站完成对与出线3连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路23，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路23和31中辅助换流模块的通流功能，然后闭合通流支路23和31的机械开关，当流过所述直流设备的直流电流完全从主断路器支路23转移至通流支路23和31后，直流开关站完成对与出线3连接的直流设备的重新连接。
(4)当直流开关站内通流支路12需要隔离时，启动通流支路12中辅助换流模块的换流功能，将通流支路12的直流电流转移到通流支路23和31上，随后断开通流支路12的机械开关，最后断开通流支路12两端的隔离刀闸，从而完成直流开关站对通流支路12的隔离；
当直流开关站内通流支路23需要隔离时，启动通流支路23中辅助换流模块的换流功能，将通流支路23的直流电流转移到通流支路12和31上，随后断开通流支路23的机械开关，最后断开通流支路23两端的隔离刀闸，至此，从而完成直流开关站对通流支路23的隔离；
当直流开关站内通流支路31需要隔离时，启动通流支路31中辅助换流模块的换流功能，将通流支路31的直流电流转移到通流支路12和23上，随后断开通流支路31的机械开关，最后断开通流支路31两端的隔离刀闸，至此，从而完成直流开关站对通流支路31的隔离。
(5)当直流开关站内主断路器支路12或者23需要隔离时，由于直流开关站连接的直流输电电网正常运行时没有负载电流(或者负载电流很小，可以忽略不计)，因此只需要断开主断路器支路12或者23两端的隔离刀闸，即可完成对主断路器支路12或者23的隔离。
作为其他实施方式，两主断路器支路还可以连接在直流出线端1和2之间、直流出线端1和3之间，或者两主断路器支路可以连接在直流出线端2和3之间、直流出线端1和3之间。
第二实施例：
当直流开关站的直流出线端个数N＝4时，直流开关站结构如图3所示，四个直流出线端分别与直流输电电网的四个直流设备(换流站、母线、输电线路等)互连，主断路器支路的个数
Figure PCTCN2016107354-appb-000002
直流开关站包含4个主断路器支路的接线端，每两个相邻直流出线端之间都连接有一个通流支路，所有通流支路首尾顺次相连构成一个通流环，非相邻的直流出线端之间连接有主断路器支路，且每个直流出线端都连接有一个主断路器支路。
如图3所示，通流支路12连接在直流出线端1和2之间，通流支路23连接在直流出线端2和3之间，通流支路34连接在直流出线端3和4之间，通流支路41连接在直流出线端4和1之间；主断路器支路13连接在直流出线端1和3之间，主断路器支路24连接在直流出线端2和4之间。这种结构的直流开关站能够实现单独切断与直流开关站相连的四个直流设备中的任意一个，且能够实现直流开关站任意一个主断路器支路或者任意一个通流支路的单独检修。过程如下：
(1)当直流开关站连接的直流输电电网正常运行时，直流开关站的四个通流支路的机械开关闭合，四个通流支路流过大部分(或者全部)的直流电流。
(2)当需要切断出线1连接的直流设备时，启动通流支路12和41中的辅助换流模块的换流功能，并开通主断路器支路13，将通流支路12和41的直流电流转移到主断路器支路13，随后断开通流支路12和41的机械开关，最后断开主断路器支路13，从而完成直流开关站内与出线1连接的直流设备的隔离；
当需要切断出线2连接的直流设备时，启动通流支路12和23中的辅助换流模块的换流功能，并开通主断路器支路24，将通流支路12和23的直流电流转移到主断路器支路24上，随后断开通流支路12和23的机械开关，最后断开主断路器支路24，从而完成直流开关站内与出线2连接的直流设备的隔离；
当需要切断出线3连接的直流设备时，启动通流支路23和34中的辅助换流模块的换流功能，并开通主断路器支路13，将通流支路23和34的直流电流转移到主断路器支路13，随后断开通流支路23和34的机械开关，最后断开主断路器支路13，从而完成直流开关站内与出线3连接的直流设备的隔离；
当需要切断出线4连接的直流设备时，启动通流支路41和34中的辅助换流模块的换流功能，并开通主断路器支路24，将通流支路41和34的直流电流转移到主断路器支路24，随后断开通流支路41和34的机械开关，最后断开主断路器支路24，从而完成直流开关站内与出线4连接的直流设备的隔离。
(3)当直流开关站完成对与出线1连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路13，在流过直 流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和41中辅助换流模块的通流功能，然后闭合通流支路12和41的机械开关，当流过所述直流设备的直流电流完全从主断路器支路13转移至通流支路12和41后，直流开关站完成对与出线1连接的直流设备的重新连接；
当直流开关站完成对与出线2连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路24，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和23中辅助换流模块的通流功能，然后闭合通流支路12和23的机械开关，当流过所述直流设备的直流电流完全从主断路器支路24转移至通流支路12和23后，直流开关站完成对与出线2连接的直流设备的重新连接；
当直流开关站完成对与出线3连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路13，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路23和34中辅助换流模块的通流功能，然后闭合通流支路23和34的机械开关，当流过所述直流设备的直流电流完全从主断路器支路13转移至通流支路23和34后，直流开关站完成对与出线3连接的直流设备的重新连接；
当直流开关站完成对与出线4连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路24，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路34和41中辅助换流模块的通流功能，然后闭合通流支路34和41的机械开关，当流过所述直流设备的直流电流完全从主断路器支路24转移至通流支路34和41后，直流开关站完成对与出线4连接的直流设备的重 新连接。
(4)当直流开关站内通流支路12需要隔离时，启动通流支路12中辅助换流模块的换流功能，将通流支路12的直流电流转移到通流支路23和41上，随后断开通流支路12的机械开关，最后断开通流支路12两端的隔离刀闸，从而完成直流开关站对通流支路12的隔离；
当直流开关站内通流支路23需要隔离时，启动通流支路23中辅助换流模块的换流功能，将通流支路23的直流电流转移到通流支路12和34上，随后断开通流支路23的机械开关，最后断开通流支路23两端的隔离刀闸，至此，从而完成直流开关站对通流支路23的隔离；
当直流开关站内通流支路34需要隔离时，启动通流支路34中辅助换流模块的换流功能，将通流支路34的直流电流转移到通流支路41和23上，随后断开通流支路34的机械开关，最后断开通流支路34两端的隔离刀闸，至此，从而完成直流开关站对通流支路34的隔离；
当直流开关站内通流支路41需要隔离时，启动通流支路41中辅助换流模块的换流功能，将通流支路41的直流电流转移到通流支路12和34上，随后断开通流支路41的机械开关，最后断开通流支路41两端的隔离刀闸，至此，从而完成直流开关站对通流支路41的隔离。
(5)当直流开关站内主断路器支路13或者24需要隔离时，由于直流开关站连接的直流输电电网正常运行时没有负载电流(或者负载电流很小，可以忽略不计)，因此只需要断开主断路器支路13或者24两端的隔离刀闸，即可完成对主断路器支路13或者24的隔离。
上述实施例中，主断路器支路连接在两非相邻的直流出线端之间，作为其他实施方式，如图4所示，主断路器支路还可以连接在两相邻的直流出线端之间，即主断路器支路12连接在直流出线端1和2之间，主断路器支路34连接在直流出线端3和4之间。这种结构的直流开关站结构简单、 扩展性相对较好。
作为其他实施方式，主断路器支路的个数还可以为M＝3，主断路器支路连接在两相邻或者非相邻的直流出线端之间，但要保证每个直流出线端至少连接有一个主断路器支路，这种结构的直流开关站中的主断路器个数相对传统直流开关站中主断路器个数要少，所以，也能一定程度上减少直流开关站的建造成本。
第三实施例：
当直流开关站的直流出线端个数N＝5时，直流开关站结构如图5所示，五个直流出线端分别与直流输电电网的五个直流设备(换流站、母线、输电线路等)互连，主断路器支路的个数
Figure PCTCN2016107354-appb-000003
直流开关站包含6个主断路器支路的接线端，每两个相邻直流出线端之间都连接有一个通流支路，所有通流支路首尾顺次相连构成一个通流环，相邻或非相邻的直流出线端之间连接有主断路器支路，且每个直流出线端都连接有一个主断路器支路。
如图5所示，通流支路12连接在直流出线端1和2之间，通流支路23连接在直流出线端2和3之间，通流支路34连接在直流出线端3和4之间，通流支路45连接在直流出线端4和5之间，通流支路51连接在直流出线端5和1之间；主断路器支路13连接在直流出线端1和3之间，主断路器支路24连接在直流出线端2和4之间，主断路器支路51连接在直流出线端5和1之间。这种结构的直流开关站能够实现单独切断与直流开关站相连的五个直流设备中的任意一个，且能够实现直流开关站任意一个主断路器支路或者任意一个通流支路的单独检修。过程如下：
(1)当直流开关站连接的直流输电电网正常运行时，直流开关站的五个通流支路的机械开关闭合，五个通流支路流过大部分(或者全部)的直流电流。
(2)当需要切断出线1连接的直流设备时，启动通流支路12和51中的辅助换流模块的换流功能，并开通主断路器支路13和51中的任意一个或者同时开通主断路器支路13和51，将通流支路12和51的直流电流转移到主断路器支路13和51中的任意一个上，或者将通流支路12和51的直流电流同时转移到两主断路器支路13和51上，随后断开通流支路12和51的机械开关，最后断开主断路器支路13和51，从而完成直流开关站内与出线1连接的直流设备的隔离；
当需要切断出线2连接的直流设备时，启动通流支路12和23中的辅助换流模块的换流功能，并开通主断路器支路24，将通流支路12和23的直流电流转移到主断路器支路24上，随后断开通流支路12和23的机械开关，最后断开主断路器支路24，从而完成直流开关站内与出线2连接的直流设备的隔离；
当需要切断出线3连接的直流设备时，启动通流支路23和34中的辅助换流模块的换流功能，并开通主断路器支路13，将通流支路23和34的直流电流转移到主断路器支路13，随后断开通流支路23和34的机械开关，最后断开主断路器支路13，从而完成直流开关站内与出线3连接的直流设备的隔离；
当需要切断出线4连接的直流设备时，启动通流支路34和45中的辅助换流模块的换流功能，并开通主断路器支路24，将通流支路34和45的直流电流转移到主断路器支路24，随后断开通流支路34和45的机械开关，最后断开主断路器支路24，从而完成直流开关站内与出线4连接的直流设备的隔离；
当需要切断出线5连接的直流设备时，启动通流支路45和51中的辅助换流模块的换流功能，并开通主断路器支路51，将通流支路45和51的直流电流转移到主断路器支路51上，随后断开通流支路45和51的机械开 关，最后断开主断路器支路51，从而完成直流开关站内与出线5连接的直流设备的隔离。
(3)当直流开关站完成对与出线1连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路13和51中的任意一个或者同时开通主断路器支路13和51，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和51中辅助换流模块的通流功能，然后闭合通流支路12和51的机械开关，当流过所述直流设备的直流电流完全从主断路器支路13和51转移至通流支路12和51后，直流开关站完成对与出线1连接的直流设备的重新连接；
当直流开关站完成对与出线2连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路24，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和23中辅助换流模块的通流功能，然后闭合通流支路12和23的机械开关，当流过所述直流设备的直流电流完全从主断路器支路24转移至通流支路12和23后，直流开关站完成对与出线2连接的直流设备的重新连接；
当直流开关站完成对与出线3连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路13，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路23和34中辅助换流模块的通流功能，然后闭合通流支路23和34的机械开关，当流过所述直流设备的直流电流完全从主断路器支路13转移至通流支路23和34后，直流开关站完成对与出线3连接的直流设备的重新连接；
当直流开关站完成对与出线4连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路24，在流过直流 设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路34和45中辅助换流模块的通流功能，然后闭合通流支路34和45的机械开关，当流过所述直流设备的直流电流完全从主断路器支路24转移至通流支路34和45后，直流开关站完成对与出线4连接的直流设备的重新连接；
当直流开关站完成对与出线5连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路51，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路45和51中辅助换流模块的通流功能，然后闭合通流支路45和51的机械开关，当流过所述直流设备的直流电流完全从主断路器支路51转移至通流支路45和51后，直流开关站完成对与出线5连接的直流设备的重新连接。
(4)当直流开关站内通流支路12需要隔离时，启动通流支路12中辅助换流模块的换流功能，将通流支路12的直流电流转移到通流支路23和通流支路51上，随后断开通流支路12的机械开关，最后断开通流支路12两端的隔离刀闸，从而完成直流开关站对通流支路12的隔离；
当直流开关站内通流支路23需要隔离时，启动通流支路23中辅助换流模块的换流功能，将通流支路23的直流电流转移到通流支路12和通流支路34上，随后断开通流支路23的机械开关，最后断开通流支路23两端的隔离刀闸，至此，从而完成直流开关站对通流支路23的隔离；
当直流开关站内通流支路34需要隔离时，启动通流支路34中辅助换流模块的换流功能，将通流支路34的直流电流转移到通流支路45和通流支路23上，随后断开通流支路34的机械开关，最后断开通流支路34两端的隔离刀闸，至此，从而完成直流开关站对通流支路34的隔离；
当直流开关站内通流支路45需要隔离时，启动通流支路45中辅助换 流模块的换流功能，将通流支路45的直流电流转移到通流支路51和通流支路34上，随后断开通流支路45的机械开关，最后断开通流支路45两端的隔离刀闸，至此，从而完成直流开关站对通流支路45的隔离；
当直流开关站内通流支路51需要隔离时，启动通流支路51中辅助换流模块的换流功能，将通流支路51的直流电流转移到通流支路45和通流支路12上，随后断开通流支路51的机械开关，最后断开通流支路51两端的隔离刀闸，至此，从而完成直流开关站对通流支路51的隔离。
(5)当直流开关站内主断路器支路12、13或者51需要隔离时，由于直流开关站连接的直流输电电网正常运行时没有负载电流(或者负载电流很小，可以忽略不计)，因此只需要断开主断路器支路12、13或者51两端的隔离刀闸，即可完成对三个主断路器支路的隔离。
作为其他实施方式，如图6所示，主断路器支路都连接在非相邻的直流出线端之间，即主断路器支路13连接在直流出线端1和3之间，主断路器支路24连接在直流出线端2和4之间，主断路器支路35连接在直流出线端3和5之间。
上述实施例中，主断路器支路连接在两非相邻的直流出线端之间，作为其他实施方式，如图7所示，主断路器支路都连接在相邻的直流出线端之间，即主断路器支路12连接在直流出线端1和2之间，主断路器支路34连接在直流出线端3和4之间，主断路器支路51连接在直流出线端5和1之间。这种结构的直流开关站结构简单、扩展性相对较好。
作为其他实施方式，如图8所示，主断路器支路连接在相邻或非相邻的直流出线端之间，即主断路器支路12连接在直流出线端1和2之间，主断路器支路34连接在直流出线端3和4之间，主断路器支路35连接在直流出线端3和5之间。
作为其他实施方式，主断路器支路的个数还可以为M＝4，主断路器支 路连接在两相邻或者非相邻的直流出线端之间，但要保证每个直流出线端至少连接有一个主断路器支路，这种结构的直流开关站中的主断路器个数相对传统直流开关站中主断路器个数要少，所以，能够很大程度上减少直流开关站的建造成本。
第四实施例：
当直流开关站的直流出线端个数N＝6时，直流开关站结构如图9所示，六个直流出线端分别与直流输电电网的六个直流设备(换流站、母线、输电线路等)互连，主断路器支路的个数
Figure PCTCN2016107354-appb-000004
直流开关站包含6个主断路器支路的接线端，每两个相邻直流出线端之间都连接有一个通流支路，所有通流支路首尾顺次相连构成一个通流环，相邻或非相邻的直流出线端之间连接有主断路器支路，且每个直流出线端都连接有一个主断路器支路。
如图9所示，通流支路12连接在直流出线端1和2之间，通流支路23连接在直流出线端2和3之间，通流支路34连接在直流出线端3和4之间，通流支路45连接在直流出线端4和5之间，通流支路56连接在直流出线端5和6之间，通流支路61连接在直流出线端6和1之间；主断路器支路12连接在直流出线端1和2之间，主断路器支路35连接在直流出线端3和5之间，主断路器支路46连接在直流出线端4和6之间。这种结构的直流开关站能够实现单独切断与直流开关站相连的五个直流设备中的任意一个，且能够实现直流开关站任意一个主断路器支路或者任意一个通流支路的单独检修。过程如下：
(1)当直流开关站连接的直流输电电网正常运行时，直流开关站的六个通流支路的机械开关闭合，六个通流支路流过大部分(或者全部)的直流电流。
(2)当需要切断出线1连接的直流设备时，启动通流支路61和23中的辅助换流模块的换流功能，并开通主断路器支路12，将通流支路61和 23的直流电流转移到主断路器支路12上，随后断开通流支路61和23的机械开关，最后断开主断路器支路12，从而完成直流开关站内与出线1连接的直流设备的隔离；
当需要切断出线2连接的直流设备时，启动通流支路12和23中的辅助换流模块的换流功能，并开通主断路器支路12，将通流支路12和23的直流电流转移到主断路器支路12上，随后断开通流支路12和23的机械开关，最后断开主断路器支路12，从而完成直流开关站内与出线2连接的直流设备的隔离；
当需要切断出线3连接的直流设备时，启动通流支路23和34中的辅助换流模块的换流功能，并开通主断路器支路35，将通流支路23和34的直流电流转移到主断路器支路35，随后断开通流支路23和34的机械开关，最后断开主断路器支路35，从而完成直流开关站内与出线3连接的直流设备的隔离；
当需要切断出线4连接的直流设备时，启动通流支路34和45中的辅助换流模块的换流功能，并开通主断路器支路46，将通流支路34和45的直流电流转移到主断路器支路46，随后断开通流支路34和45的机械开关，最后断开主断路器支路46，从而完成直流开关站内与出线4连接的直流设备的隔离；
当需要切断出线5连接的直流设备时，启动通流支路45和56中的辅助换流模块的换流功能，并开通主断路器支路35，将通流支路45和56的直流电流转移到主断路器支路35上，随后断开通流支路45和56的机械开关，最后断开主断路器支路35，从而完成直流开关站内与出线5连接的直流设备的隔离；
当需要切断出线6连接的直流设备时，启动通流支路61和56中的辅助换流模块的换流功能，并开通主断路器支路46，将通流支路61和56的 直流电流转移到主断路器支路46上，随后断开通流支路61和56的机械开关，最后断开主断路器支路46，从而完成直流开关站内与出线6连接的直流设备的隔离。
(3)当直流开关站完成对与出线1连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路12，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和61中辅助换流模块的通流功能，然后闭合通流支路12和61的机械开关，当流过所述直流设备的直流电流完全从主断路器支路12转移至通流支路12和61后，直流开关站完成对与出线1连接的直流设备的重新连接；
当直流开关站完成对与出线2连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路12，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路12和23中辅助换流模块的通流功能，然后闭合通流支路12和23的机械开关，当流过所述直流设备的直流电流完全从主断路器支路12转移至通流支路12和23后，直流开关站完成对与出线2连接的直流设备的重新连接；
当直流开关站完成对与出线3连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路35，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路23和34中辅助换流模块的通流功能，然后闭合通流支路23和34的机械开关，当流过所述直流设备的直流电流完全从主断路器支路35转移至通流支路23和34后，直流开关站完成对与出线3连接的直流设备的重新连接；
当直流开关站完成对与出线4连接的直流设备的隔离后短时间内，系 统要求重新连接所述直流设备时，首先开通主断路器支路46，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路34和45中辅助换流模块的通流功能，然后闭合通流支路34和45的机械开关，当流过所述直流设备的直流电流完全从主断路器支路46转移至通流支路34和45后，直流开关站完成对与出线4连接的直流设备的重新连接；
当直流开关站完成对与出线5连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路35，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路45和56中辅助换流模块的通流功能，然后闭合通流支路45和56的机械开关，当流过所述直流设备的直流电流完全从主断路器支路35转移至通流支路45和56后，直流开关站完成对与出线5连接的直流设备的重新连接；
当直流开关站完成对与出线6连接的直流设备的隔离后短时间内，系统要求重新连接所述直流设备时，首先开通主断路器支路46，在流过直流设备的直流电流不超过直流开关站过流保护定值并保持一定时间后，开通通流支路56和61中辅助换流模块的通流功能，然后闭合通流支路56和61的机械开关，当流过所述直流设备的直流电流完全从主断路器支路46转移至通流支路56和61后，直流开关站完成对与出线6连接的直流设备的重新连接。
(4)当直流开关站内通流支路12需要隔离时，启动通流支路12中辅助换流模块的换流功能，将通流支路12的直流电流转移到通流支路23和通流支路61上，随后断开通流支路12的机械开关，最后断开通流支路12两端的隔离刀闸，从而完成直流开关站对通流支路12的隔离；
当直流开关站内通流支路23需要隔离时，启动通流支路23中辅助换 流模块的换流功能，将通流支路23的直流电流转移到通流支路12和通流支路34上，随后断开通流支路23的机械开关，最后断开通流支路23两端的隔离刀闸，至此，从而完成直流开关站对通流支路23的隔离；
当直流开关站内通流支路34需要隔离时，启动通流支路34中辅助换流模块的换流功能，将通流支路34的直流电流转移到通流支路45和通流支路23上，随后断开通流支路34的机械开关，最后断开通流支路34两端的隔离刀闸，至此，从而完成直流开关站对通流支路34的隔离；
当直流开关站内通流支路45需要隔离时，启动通流支路45中辅助换流模块的换流功能，将通流支路45的直流电流转移到通流支路56和通流支路34上，随后断开通流支路45的机械开关，最后断开通流支路45两端的隔离刀闸，至此，从而完成直流开关站对通流支路45的隔离；
当直流开关站内通流支路56需要隔离时，启动通流支路56中辅助换流模块的换流功能，将通流支路56的直流电流转移到通流支路45和通流支路61上，随后断开通流支路56的机械开关，最后断开通流支路56两端的隔离刀闸，至此，从而完成直流开关站对通流支路56的隔离；
当直流开关站内通流支路61需要隔离时，启动通流支路61中辅助换流模块的换流功能，将通流支路61的直流电流转移到通流支路12和通流支路56上，随后断开通流支路61的机械开关，最后断开通流支路61两端的隔离刀闸，至此，从而完成直流开关站对通流支路61的隔离。
(5)当直流开关站内主断路器支路12、35或者46需要隔离时，由于直流开关站连接的直流输电电网正常运行时没有负载电流(或者负载电流很小，可以忽略不计)，因此只需要断开主断路器支路12、35或者46两端的隔离刀闸，即可完成对三个主断路器支路的隔离。
作为其他实施方式，如图10所示，主断路器支路都连接在非相邻的直流出线端之间，即主断路器支路14连接在直流出线端1和4之间，主断路 器支路25连接在直流出线端2和5之间，主断路器支路36连接在直流出线端3和6之间。
如图11所示，主断路器支路都连接在非相邻的直流出线端之间，即主断路器支路14连接在直流出线端1和4之间，主断路器支路26连接在直流出线端2和6之间，主断路器支路35连接在直流出线端3和5之间。
上述实施例中，主断路器支路连接在两非相邻的直流出线端之间，作为其他实施方式，如图12所示，主断路器支路都连接在相邻的直流出线端之间，即主断路器支路12连接在直流出线端1和2之间，主断路器支路34连接在直流出线端3和4之间，主断路器支路56连接在直流出线端5和6之间。这种结构的直流开关站结构简单、扩展性相对较好。
作为其他实施方式，如图13所示，主断路器支路连接在相邻或非相邻的直流出线端之间，即主断路器支路12连接在直流出线端1和2之间，主断路器支路36连接在直流出线端3和6之间，主断路器支路45连接在直流出线端4和5之间。
作为其他实施方式，主断路器支路的个数还可以为M＝4或M＝5，主断路器支路连接在两相邻或者非相邻的直流出线端之间，但要保证每个直流出线端至少连接有一个主断路器支路，这种结构的直流开关站中的主断路器个数相对传统直流开关站中主断路器个数要少，所以，能够很大程度上减少直流开关站的建造成本。
以上实施例仅用以说明本发明的技术方案而非对其限制，其他依据本发明技术方案对实施方式进行修改或者等同替换，而未脱离本发明精神和范围的任何修改或者等同替换，其均应涵盖在本发明的权利要求范围当中。
工业实用性
本发明实施例的技术方案一方面，能够实现直流开关站的每个直流出线端与两个通流支路直接连接，每个直流出线端都能至少与一个主断路器 支路相连接，正常运行时任意一个直流出线的电流等于直流开关站内与直流出线直接连接的两个通流支路的电流和。这样不仅能够减小每个通流支路上的额定通流电流，而且实现了对任意一个通流支路进行单独检修时，直流开关站的其他直流出线端均不停电。另一方面，直流开关站中主断路器支路的个数小于通流支路的个数，且每个直流出线端都连接有一个或两个所述主断路器支路。因此该方法设计的直流开关站比现有直流开关站中主断路器数量少，简化了直流开关站的整体结构，从而直流开关站的控制难度也大大降低；又由于主断路器的结构特殊，其价格昂贵，减少主断路器的数量能够很大程度上减少直流开关站的建造成本，所以，这样既能满足直流开关站的性能要求和又可以降低成本。

Claims (4)

  1. 一种直流开关站，所述直流开关站包括N个直流出线端，N≥3，相邻的直流出线端之间连接有通流支路，且各通流支路首尾顺次相连成一个通流环；
    所述直流开关站还包括M个主断路器支路，M＜N，所述主断路器支路连接在相邻或非相邻的直流出线端之间，且每个直流出线端都连接有一个或两个主断路器支路；
    所述通流支路是用于直流断路器的通流支路，所述主断路器支路是用于直流断路器的转移支路和耗能支路。
  2. 根据权利要求1所述的一种直流开关站，其中，所述主断路器支路的个数M由所述直流出线端个数N决定：
    当直流出线端个数N为奇数时，所述主断路器支路的个数M＝X＝(N+1)/2；
    当直流出线端个数N为偶数时，所述主断路器支路的个数M＝X＝N/2。
  3. 根据权利要求2所述的一种直流开关站，其中，当所述直流出线端个数N为奇数时，N个直流出线端中的一个直流出线端连接两个所述主断路器支路，除所述直流出线端以外的其他直流出线端连接一个所述主断路器支路；当所述直流出线端个数N为偶数时，每个直流出线端都连接一个主断路器支路。
  4. 根据权利要求2或3所述的一种直流开关站，其中，所述主断路器支路均连接在两相邻的所述直流出线端之间。
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