CN103632895B - A kind of DC circuit breaker - Google Patents

A kind of DC circuit breaker Download PDF

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Publication number
CN103632895B
CN103632895B CN201310646936.7A CN201310646936A CN103632895B CN 103632895 B CN103632895 B CN 103632895B CN 201310646936 A CN201310646936 A CN 201310646936A CN 103632895 B CN103632895 B CN 103632895B
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combined loop
current path
out terminal
initial current
combined
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CN103632895A (en
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肖立业
韦统振
朱晋
王珏
邱清泉
张志丰
林良真
齐智平
李耀华
严萍
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Priority to PCT/CN2014/070205 priority patent/WO2015081615A1/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/548Electromechanical and static switch connected in series
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/59Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
    • H01H33/596Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle for interrupting DC
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/025Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/04Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16Impedances connected with contacts

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A kind of DC circuit breaker, by initial current path (23), the first combined loop (21) and the second combined loop (22) composition; First leading-out terminal of initial current path (23) is connected with the second leading-out terminal of the first combined loop (21), and the second leading-out terminal of initial current path (23) is connected with the first leading-out terminal of the second combined loop (22); First leading-out terminal of the first combined loop (21) is connected with DC transmission line as the first leading-out terminal of DC circuit breaker, and the second leading-out terminal of the second combined loop (22) is connected with the other end of DC transmission line as the second leading-out terminal of DC circuit breaker.When HVDC (High Voltage Direct Current) transmission line breaks down, cut-offfing of faulty transmission line can be realized fast.

Description

一种直流断路器A DC circuit breaker

技术领域technical field

本发明涉及一种断路器,具体涉及一种直流断路拓扑及其控制方法。The invention relates to a circuit breaker, in particular to a direct current circuit breaking topology and a control method thereof.

背景技术Background technique

快速直流断路器是保证直流输配电系统和直流电网系统稳定安全可靠运行的关键设备之一。与交流系统所不同的是,直流系统的电流并不存在自然过零点,因此直流系统中无法像交流系统一样利用电流的自然过零点关断,因此直流电流的开断问题一直是一个值得研究的课题。Fast DC circuit breaker is one of the key equipment to ensure the stable, safe and reliable operation of DC power transmission and distribution system and DC grid system. Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system like the AC system. Therefore, the breaking of the DC current has always been a problem worth studying. topic.

目前开断直流电流通常有两种方式,第一种是纯电力电子断路器,如ABB申请的专利CN102870181A,利用大功率可关断电力电子器件,直接分断直流电流。利用这种原理制造的固态断路器,在时间上虽然可以满足多端柔性直流系统的要求,但在正常导通时的损耗过大,经济性较差。At present, there are usually two ways to break the DC current. The first is a pure power electronic circuit breaker, such as the patent CN102870181A applied by ABB, which can turn off the power electronic device by using high power and directly break the DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the multi-terminal flexible DC system in terms of time, the loss is too large during normal conduction, and the economy is poor.

第二种是混合断路器技术,即在传统的交流机械断路器的基础上,通过增加辅助的电力电子电路,投入限流电阻以降低短路电流或在开断弧间隙的直流电流上叠加振荡电流,利用电流过零时开断电路。利用这种原理制造的混合式断路器,其对机械开关有特殊要求,在分断时间上较难满足直流输电系统的要求。The second is the hybrid circuit breaker technology, that is, on the basis of the traditional AC mechanical circuit breaker, by adding an auxiliary power electronic circuit, inputting a current limiting resistor to reduce the short-circuit current or superimposing an oscillating current on the DC current that opens the arc gap , use the current to break the circuit when it crosses zero. The hybrid circuit breaker manufactured using this principle has special requirements for mechanical switches, and it is difficult to meet the requirements of the DC transmission system in terms of breaking time.

发明内容Contents of the invention

本发明的目的是克服现有技术的不足,提出一种混合式直流断路器。本发明具有稳态运行时损耗小,出现短路故障时无电弧切断,响应迅速等特点。The purpose of the present invention is to overcome the deficiencies of the prior art and propose a hybrid DC circuit breaker. The invention has the characteristics of low loss during steady-state operation, no arc cut-off when a short-circuit fault occurs, and rapid response.

本发明直流断路器拓扑结构包括:初始电流通路,第一组合回路和第二组合回路。初始电流通路的第一引出端子与第一组合回路的第二引出端子连接,初始电流通路的第二引出端子与第二组合回路的第一引出端子连接。第一组合回路的第一引出端子作为直流断路器的第一引出端子与直流输电线连接,第二组合回路的第二引出端子作为直流断路器的第二引出端子与直流输电线的另一端连接。初始电流通路有多种组成形式,例如机械开关模块与电力电子开关模块串联,机械开关模块串联,电力电子开关模块串联等。The topological structure of the DC circuit breaker of the present invention includes: an initial current path, a first combination circuit and a second combination circuit. The first lead-out terminal of the initial current path is connected to the second lead-out terminal of the first combined circuit, and the second lead-out terminal of the initial current path is connected to the first lead-out terminal of the second combined circuit. The first lead-out terminal of the first combination circuit is connected to the DC transmission line as the first lead-out terminal of the DC circuit breaker, and the second lead-out terminal of the second combination circuit is connected to the other end of the DC transmission line as the second lead-out terminal of the DC circuit breaker . There are many forms of initial current path, such as mechanical switch modules connected in series with power electronic switch modules, mechanical switch modules connected in series, power electronic switch modules connected in series, etc.

当检测到线路短路故障以后,立即开始切断初始电流通路;在完全断开初始电流通路以前,第一组合电路和第二组合电路使得初始电流通路两端电位差维持在较低的水平,并且第一组合电路和第二组合电路可以分别为故障电流提供续流通路,以便于初始电流通路断开;当初始电流通路完全断开以后,故障电流分别通过第一组合电路和第二组合电路续流,并逐渐衰减、或振荡衰减到零或由第一组合电路和第二组合电内置的开关在电流过零点分别分断。When the line short-circuit fault is detected, the initial current path is cut off immediately; before the initial current path is completely disconnected, the first combination circuit and the second combination circuit maintain the potential difference between the two ends of the initial current path at a lower level, and the second The first combined circuit and the second combined circuit can respectively provide freewheeling paths for the fault current, so as to facilitate the disconnection of the initial current path; when the initial current path is completely disconnected, the fault current continues to flow through the first combined circuit and the second combined circuit respectively , and gradually attenuate, or the oscillation decays to zero, or the switches built in the first combination circuit and the second combination circuit are respectively broken at the current zero crossing point.

所述的初始电流通路包括电力电子模块和机械开关模块;所述的第一组合回路包括一个电感、一个电容和一个内置机械开关,所述的第二组合回路包括一个电感、一个电容及其充电电路,充电电路包括充电电路内置开关及充电电路电阻,第二组合回路充电电路的内置开关可以由机械开关模块组成,也可以由电力电子开关模块组成。所述的初始电流通路中的机械开关模块包括至少一个机械开关串联组件,所述的初始电流通路中的电力电子模块包括至少一个的电力电子全控器件串联组件;机械开关模块的一端与电力电子模块的一端连接,机械开关模块的另一端作为初始电流通路的第一引出端子;电力电子模块的另一端作为初始电流通路的第二引出端子,和第二组合回路的第一引出端子连接;所述的第一组合回路电感一端作为第一组合回路的第一引出端子和直流输电线连接;所述的第一组合回路电感的另一端与第一组合回路电容的一端连接,作为第一组合回路的第二引出端子,和初始电流通路的第一引出端子连接;第一组合回路电容的另一端作为第一组合回路的第三引出端子直接接地或连接中性线;所述的第二组合回路充电电路内置开关一端与第二组合回路充电电路电阻一端连接作为第二组合回路充电电路的第一引出端子,所述第二组合回路充电电路内置开关另一端与第二组合回路充电电路电阻另一端作为第二组合回路充电电路的第二引出端子;第二组合回路电感一端与第二组合回路充电电路第一引出端子连接作为第二组合回路的第一引出端子,所述第二组合回路充电电路的第二引出端子与电容一端连接,第二组合回路电感的另一端作为第二组合回路的第二引出端子;第二组合回路电容的另一端作为第二组合回路的第三引出端子直接接地或连接中性线;初始电流通路的第二引出端子与第一组合回路的第二引出端子连接,初始电流通路的第二引出端子与第二组合回路的第一引出端子连接。The initial current path includes a power electronic module and a mechanical switch module; the first combined circuit includes an inductor, a capacitor and a built-in mechanical switch, and the second combined circuit includes an inductor, a capacitor and its charging The charging circuit includes a built-in switch of the charging circuit and a resistor of the charging circuit, and the built-in switch of the charging circuit of the second combined loop may be composed of a mechanical switch module or a power electronic switch module. The mechanical switch module in the initial current path includes at least one mechanical switch series assembly, and the power electronic module in the initial current path includes at least one series assembly of power electronic fully controlled devices; one end of the mechanical switch module is connected to the power electronic module. One end of the module is connected, and the other end of the mechanical switch module is used as the first lead-out terminal of the initial current path; the other end of the power electronic module is used as the second lead-out terminal of the initial current path, and is connected to the first lead-out terminal of the second combined circuit; One end of the first combined loop inductance is connected to the DC transmission line as the first lead-out terminal of the first combined loop; the other end of the first combined loop inductance is connected to one end of the first combined loop capacitor as the first combined loop The second lead-out terminal of the initial current path is connected to the first lead-out terminal of the initial current path; the other end of the capacitor of the first combination circuit is directly grounded or connected to the neutral line as the third lead-out terminal of the first combination circuit; the second combination circuit One end of the built-in switch of the charging circuit is connected to one end of the resistor of the charging circuit of the second combined loop as the first lead-out terminal of the charging circuit of the second combined loop, and the other end of the built-in switch of the charging circuit of the second combined loop is connected to the other end of the resistor of the charging circuit of the second combined loop. As the second lead-out terminal of the second combined loop charging circuit; one end of the second combined loop inductance is connected to the first lead-out terminal of the second combined loop charging circuit as the first lead-out terminal of the second combined loop, and the second combined loop charging circuit The second lead-out terminal of the second combination loop is connected to one end of the capacitor, and the other end of the second combination loop inductance is used as the second lead-out terminal of the second combination loop; the other end of the second combination loop capacitor is directly grounded as the third lead-out terminal of the second combination loop or Connect the neutral line; the second lead-out terminal of the initial current path is connected to the second lead-out terminal of the first combined circuit, and the second lead-out terminal of the initial current path is connected to the first lead-out terminal of the second combined circuit.

在直流输电线路无故障时,所述的初始电流通路的机械开关模块和电力电子模块均处于闭合状态,当检测到第二组合回路电感或第一组合回路电感上流过的电流超过限定值时,电力电子模块首先断开,然后机械开关模块迅速断开,之后断开内置开关,以在电流过零点时分别开断第一组合回路和第二组合回路,从而实现对故障线路的开断;机械开关模块和电力电子模块断开顺序的另一种方式为:当检测到第二组合回路电感或第一组合回路电感上流过的电流超过限定值时,机械开关模块首先断开,然后电力电子模块迅速断开,之后断开内置开关,以在电流过零点时分别开断第一组合回路和第二组合回路,从而实现对故障线路的开断。When there is no fault in the DC transmission line, the mechanical switch module and the power electronic module of the initial current path are both in a closed state, and when it is detected that the current flowing through the second combination loop inductance or the first combination loop inductance exceeds a limit value, The power electronic module is disconnected first, then the mechanical switch module is disconnected quickly, and then the built-in switch is disconnected to respectively disconnect the first combined circuit and the second combined circuit when the current crosses zero, so as to realize the disconnection of the fault line; mechanical Another method of disconnecting the switch module and the power electronic module is: when it is detected that the current flowing through the second combined loop inductance or the first combined loop inductance exceeds the limit value, the mechanical switch module is first disconnected, and then the power electronic module is disconnected. Quickly disconnect, and then disconnect the built-in switch to respectively disconnect the first combination circuit and the second combination circuit when the current crosses zero, so as to realize the disconnection of the fault line.

本发明可以在第一组合回路电感的一端与第一组合回路的第二引出端子选择性的增加电容预充电电路,或在第二组合回路的第一引出端子与第二组合回路电容的一端之间选择性的增加电容的预充电电路。The present invention can selectively add a capacitor pre-charging circuit between one end of the inductance of the first combined loop and the second lead-out terminal of the first combined loop, or between the first lead-out terminal of the second combined loop and one end of the capacitor of the second combined loop Selectively increase the capacitance of the pre-charge circuit.

本发明也可以在初始电流通路两端可以选择性的并联电容。In the present invention, capacitors can also be selectively connected in parallel at both ends of the initial current path.

本发明可以在第一组合回路电容两端和第二组合回路电容两端并联限压器,限制电容两端电压,从而避免电容器因过电压而损坏;也可以在初始电流通路的两端并联限压器,从而避免初始电流通路因过电压而损坏。或者在第一组合回路和第二组合回路之间串接限压器。In the present invention, a voltage limiter can be connected in parallel at both ends of the capacitance of the first combined circuit and the two ends of the second combined circuit to limit the voltage at both ends of the capacitor, thereby avoiding damage to the capacitor due to overvoltage; it can also be connected in parallel with a limiter at both ends of the initial current path. transformer, so as to avoid damage to the initial current path due to overvoltage. Or connect a voltage limiter in series between the first combination circuit and the second combination circuit.

所述的第一组合回路的另一种实现方式为仅包括一个电容和内置机械开关,用直流输电线代替电感。Another implementation of the first combination circuit includes only one capacitor and a built-in mechanical switch, and a direct current transmission line is used instead of an inductor.

所述的第一组合回路另一种结构方式为仅包括一个内置机械开关,电容可以移除,用直流输电线代替电感。Another structure of the first combined circuit is that it only includes a built-in mechanical switch, the capacitor can be removed, and the inductor is replaced by a direct current transmission line.

所述的初始电流通路仅包括机械开关模块,可用输电线代替电力电子模块。The initial current path only includes the mechanical switch module, and the power electronic module can be replaced by a transmission line.

所述的初始电流通路仅包括电力电子开关模块,可用输电线代替机械开关模块;在此,电力电子开关模块可以用多组全控开关模块组成、也可用一组全控开关模块与多组半控开关模块组成,也可以由半桥或者全桥子单元模块级联结构组成。The initial current path only includes the power electronic switch module, and the mechanical switch module can be replaced by a transmission line; here, the power electronic switch module can be composed of multiple groups of full-control switch modules, or a group of full-control switch modules can be combined with multiple groups of semi- It can also be composed of half-bridge or full-bridge sub-unit module cascade structure.

本发明直流断路器的拓扑结构以中性线或接地点为参考点对称安装的结构形式适用于双极性输电线路。The topological structure of the DC circuit breaker of the present invention is symmetrically installed with the neutral line or the grounding point as the reference point, and is suitable for bipolar power transmission lines.

本发明第一组合回路和第二组合回路中的电感和电容构成一个一阶无源网络结构,但是并不仅限于一阶结构,即并不仅限于只包含一个电感和一个电容,可以由多个电感和电容或电阻组成多阶类似的结构连接在一起取代本文中第一组合回路和第二组合回路中的电容和电感。The inductors and capacitors in the first combined loop and the second combined loop of the present invention form a first-order passive network structure, but it is not limited to the first-order structure, that is, it is not limited to only including one inductor and one capacitor, and can be composed of multiple inductors Multi-stage similar structures formed with capacitors or resistors are connected together to replace the capacitors and inductances in the first combination loop and the second combination loop herein.

所述的初始电流通路另一种实现方式是:由初始电流通路第一开关单元和一个或多个电容开关组合电路级联组成。所述的电容开关组合电路由电容单元,开关单元,预充电电阻,预充电电阻旁路开关组成。所述的预充电电阻一端与电容一端连接,电容单元另一端与地或双极性直流输电中性线连接,预充电电阻另一端与开关单元连接作为电容开关组合电路一端引出端子,开关单元的另一端作为电容开关组合电路另一端引出端子,预充电电阻旁路开关并联在预充电电阻两端。所述开关单元可以是机械开关、电力电子开关或者机械开关与电力电子相结合的组合开关。Another implementation manner of the initial current path is: the initial current path is formed by cascading the first switch unit of the initial current path and one or more capacitive switch combination circuits. The capacitor switch combination circuit is composed of a capacitor unit, a switch unit, a pre-charging resistor, and a pre-charging resistor bypass switch. One end of the pre-charging resistor is connected to one end of the capacitor, the other end of the capacitor unit is connected to the ground or the neutral line of the bipolar direct current transmission, and the other end of the pre-charging resistor is connected to the switch unit as a lead-out terminal at one end of the capacitor switch combination circuit. The other end is used as the terminal leading out from the other end of the capacitor switch combination circuit, and the pre-charging resistor bypass switch is connected in parallel to both ends of the pre-charging resistor. The switch unit may be a mechanical switch, a power electronic switch or a combination switch combining mechanical switches and power electronics.

在直流输电系统正常运行时,所述初始电流通路中的所有电容开关组合电路所有开关单元均处于导通状态。当线路出现短路故障时,所述初始电流通路中的电容开关组合电路内的开关单元和初始电流通路第一开关单元顺次开断或同时开断;最终形成第一组合回路与第二组合回路两个电流回路,其后的关断过程与不加入电容开关组合电路时直流断路器关断过程相同。When the direct current transmission system is in normal operation, all switch units of all capacitive switch combination circuits in the initial current path are in a conducting state. When a short-circuit fault occurs in the line, the switch units in the capacitive switch combined circuit in the initial current path and the first switch unit in the initial current path are sequentially or simultaneously disconnected; finally, the first combined circuit and the second combined circuit are formed Two current loops, the subsequent shutdown process is the same as the DC circuit breaker shutdown process without adding a capacitor switch combination circuit.

所述的第二组合回路电流震荡衰减至零,根据已知的第二组合回路电感值和第二组合回路电容值,以及电流震荡衰减至零的暂态过程,可推算出此时的短路阻抗,可用于推算出短路点的位置,进行故障定位。The current oscillation of the second combination loop decays to zero, and the short-circuit impedance at this time can be calculated according to the known inductance value of the second combination loop, the capacitance value of the second combination loop, and the transient process in which the current oscillation decays to zero , which can be used to calculate the location of the short-circuit point for fault location.

本发明的优点:Advantages of the present invention:

a.该直流断路器拓扑开断更为迅速,能够实现零电弧开断;a. The topological breaking of the DC circuit breaker is faster and can achieve zero arc breaking;

b.整个换流拓扑可采用常规部件,制造难度相对较小,可靠性高;b. The entire commutation topology can use conventional components, which is relatively less difficult to manufacture and has high reliability;

c.该直流断路器能够将短路电流控制在较低的水平,从而保护系统安全性;c. The DC circuit breaker can control the short-circuit current at a lower level, thereby protecting the safety of the system;

d.该直流断路器拓扑能够减小短路电流对换流站的影响;d. The DC circuit breaker topology can reduce the impact of short-circuit current on the converter station;

e.更容易与柔性直流输电系统结合,适宜于一体化设计;e. It is easier to combine with the flexible DC transmission system and is suitable for integrated design;

f.与纯电力电子开关式直流断路器相比系统正常工作时的损耗更小;f. Compared with the pure power electronic switching DC circuit breaker, the loss of the system during normal operation is smaller;

g.该断路器还能够用于维持正常态运行时的暂态电压稳定性。g. The circuit breaker can also be used to maintain transient voltage stability during normal operation.

h.该断路器还能够对永久性短路故障的短路点进行定位检测。h. The circuit breaker can also locate and detect the short-circuit point of the permanent short-circuit fault.

附图说明Description of drawings

图1为本发明的电路原理图;Fig. 1 is a schematic circuit diagram of the present invention;

图2为本发明的具体实施例1中的电路原理图;Fig. 2 is the schematic circuit diagram in the specific embodiment 1 of the present invention;

图3为本发明的具体实施例2中的电路原理图;Fig. 3 is the schematic circuit diagram in the specific embodiment 2 of the present invention;

图4为本发明的具体实施例3中的电路原理图;Fig. 4 is the schematic circuit diagram in the specific embodiment 3 of the present invention;

图5为本发明的具体实施例4中的电路原理图;Fig. 5 is the schematic circuit diagram among the concrete embodiment 4 of the present invention;

图6为本发明的具体实施例5中的电路原理图;Fig. 6 is the schematic circuit diagram among the specific embodiment 5 of the present invention;

图7为本发明的具体实施例6中的电路原理图;Fig. 7 is the schematic circuit diagram among the concrete embodiment 6 of the present invention;

图8为本发明的具体实施例7中的电路原理图;Fig. 8 is the schematic diagram of the circuit in the specific embodiment 7 of the present invention;

图9为本发明的具体实施例8中的电路原理图;Fig. 9 is a schematic circuit diagram in Embodiment 8 of the present invention;

图10为本发明的具体实施例9中的电路原理图;Fig. 10 is a schematic circuit diagram in Embodiment 9 of the present invention;

图11为本发明的具体实施例10中的电路原理图;Fig. 11 is a schematic circuit diagram in Embodiment 10 of the present invention;

图12为本发明的具体实施例11中的电路原理图;Fig. 12 is a schematic circuit diagram in Embodiment 11 of the present invention;

图13为本发明的具体实施例12中的电路原理图。FIG. 13 is a circuit schematic diagram in Embodiment 12 of the present invention.

具体实施方式detailed description

下面结合附图及具体实施方式对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

如图1所示,本发明包括初始电流通路23、第一组合回路21和第二组合回路22。初始电流通路23的第一引出端子与第一组合回路21的第二引出端子连接,初始电流通路23的第二引出端子与第二组合回路的第一引出端子连接,第一组合回路的第一引出端子作为直流断路器的第一引出端子1与直流输电线连接,第二组合回路的第二引出端子作为直流断路器的第二引出端子6与直流输电线的另一端连接。As shown in FIG. 1 , the present invention includes an initial current path 23 , a first combining loop 21 and a second combining loop 22 . The first lead-out terminal of the initial current path 23 is connected with the second lead-out terminal of the first combined circuit 21, the second lead-out terminal of the initial current path 23 is connected with the first lead-out terminal of the second combined circuit, and the first lead-out terminal of the first combined circuit The lead-out terminal is connected to the DC transmission line as the first lead-out terminal 1 of the DC circuit breaker, and the second lead-out terminal of the second combined circuit is connected to the other end of the DC transmission line as the second lead-out terminal 6 of the DC circuit breaker.

实施例1Example 1

图2所示为本发明的实施例1。如图2所示,直流电源24为换流站,电阻25为短路电阻。本发明直流断路拓扑的基本结构包括:初始电流通路23,第一组合回路21、第二组合回路22和限压器15。所述的初始电流通路包括电力电子模块13和机械开关模块12;所述的第一组合回路包括一个电感11和一个电容16,所述的第二组合回路包括一个电感14、一个电容17、电容充电电路内置开关5,0以及电容充电电路电阻49。Figure 2 shows Embodiment 1 of the present invention. As shown in FIG. 2 , the DC power supply 24 is a converter station, and the resistor 25 is a short-circuit resistor. The basic structure of the DC breaking topology of the present invention includes: an initial current path 23 , a first combined circuit 21 , a second combined circuit 22 and a voltage limiter 15 . The initial current path includes a power electronics module 13 and a mechanical switch module 12; the first combined loop includes an inductor 11 and a capacitor 16, and the second combined loop includes an inductor 14, a capacitor 17, and a capacitor The charging circuit has a built-in switch 5, 0 and a capacitor charging circuit resistor 49.

所述的初始电流通路包括电力电子模块13和机械开关模块12;所述的第一组合回路包括一个电感11、一个电容16和一个内置机械开关61,所述的第二组合回路包括一个电感14、一个电容17及其充电电路,所述充电电路由内置开关49及电阻50组成;所述的初始电流通路中的机械开关模块12包括至少一个机械开关串联组件,所述的初始电流通路中的电力电子模块13包括至少一个的电力电子全控器件串联组件;机械开关模块12的一端与电力电子模块13的一端连接,机械开关模块12的另一端作为初始电流通路的第一引出端子;电力电子模块的另一端作为初始电流通路的第二引出端子,和第二组合回路22的第一引出端子连接;所述的第一组合回路电感11的一端作为第一组合回路的第一引出端子1和直流输电线连接;所述的第一组合回路电感11的另一端与第一组合回路电容16的一端连接,作为第一组合回路21的第二引出端子2和初始电流通路23的第一引出端子连接;第一组合回路电容16的另一端作为第一组合回路的第三引出端子8直接接地或连接中性线;所述的第二组合回路充电电路内置开关49一端与第二组合回路充电电路电阻50一端连接作为第二组合回路充电电路的第一引出端子101,所述第二组合回路充电电路内置开关49另一端与第二组合回路充电电路电阻50另一端作为第二组合回路充电电路的第二引出端子102;第二组合回路电感14的一端与第二组合回路充电电路第一引出端子101连接作为第二组合回路22的第一引出端子3,所述第二组合回路充电电路的第二引出端子102与电容17的一端连接,第二组合回路电感14的另一端作为第二组合回路22的第二引出端子;第二组合回路电容17的另一端作为第二组合回路22的第三引出端子7直接接地或连接中性线;初始电流通路23的第二引出端子与第一组合回路21的第二引出端子2连接,初始电流通路23的第二引出端子与第二组合回路22的第一引出端子3连接。The initial current path includes a power electronics module 13 and a mechanical switch module 12; the first combined loop includes an inductor 11, a capacitor 16 and a built-in mechanical switch 61, and the second combined loop includes an inductor 14 , a capacitor 17 and its charging circuit, the charging circuit is made up of a built-in switch 49 and a resistor 50; the mechanical switch module 12 in the initial current path includes at least one mechanical switch series assembly, and the mechanical switch module 12 in the initial current path The power electronic module 13 includes at least one series assembly of power electronic fully controlled devices; one end of the mechanical switch module 12 is connected to one end of the power electronic module 13, and the other end of the mechanical switch module 12 is used as the first lead-out terminal of the initial current path; The other end of the module is used as the second lead-out terminal of the initial current path, and is connected to the first lead-out terminal of the second combined loop 22; one end of the first combined loop inductance 11 is used as the first lead-out terminal 1 of the first combined loop and DC power line connection; the other end of the first combined circuit inductance 11 is connected to one end of the first combined circuit capacitor 16, as the second lead-out terminal 2 of the first combined circuit 21 and the first lead-out terminal of the initial current path 23 connection; the other end of the first combined circuit capacitor 16 is directly grounded or connected to the neutral line as the third lead-out terminal 8 of the first combined circuit; one end of the built-in switch 49 of the second combined circuit charging circuit is connected to the second combined circuit charging circuit One end of the resistor 50 is connected to the first lead-out terminal 101 of the second combined loop charging circuit, and the other end of the built-in switch 49 of the second combined loop charging circuit and the other end of the second combined loop charging circuit resistor 50 are used as the second combined loop charging circuit. The second lead-out terminal 102; one end of the second combination loop inductance 14 is connected with the first lead-out terminal 101 of the second combination loop charging circuit as the first lead-out terminal 3 of the second combination loop 22, and the first lead-out terminal 3 of the second combination loop charging circuit Two lead-out terminals 102 are connected with one end of capacitor 17, and the other end of the second combined loop inductance 14 is as the second drawn terminal of the second combined loop 22; The lead-out terminal 7 is directly grounded or connected to the neutral line; the second lead-out terminal of the initial current path 23 is connected with the second lead-out terminal 2 of the first combined circuit 21, and the second lead-out terminal of the initial current path 23 is connected with the second lead-out terminal of the second combined circuit 22. The first lead-out terminal 3 is connected.

所述的限压器15的一端与第一组合回路的第一引出端子2连接,限压器的另一端与第二组合回路的第一引出端子3连接。限压器有多种实现方式,如非线性电阻ZnO限流器等;One end of the voltage limiter 15 is connected to the first lead-out terminal 2 of the first combined circuit, and the other end of the voltage limiter is connected to the first lead-out terminal 3 of the second combined circuit. There are many ways to realize the voltage limiter, such as the non-linear resistor ZnO current limiter, etc.;

在直流输电线路没有短路情况发生时,所述的初始电流通路的机械开关模块12和电力电子模块13均处于闭合状态,当检测到短路态震荡电流通路电感14上流过的电流超过限定值时,电力电子模块13首先断开,然后机械开关模块12迅速断开,当第一组合回路的第二引出端子2与第二组合回路的第一引出端子3之间的电压超过限压器15的动作电压时,限压器15动作,消耗上第一组合回路电感上储存的多余能量。When no short circuit occurs on the DC transmission line, the mechanical switch module 12 and the power electronic module 13 of the initial current path are both in a closed state, and when it is detected that the current flowing through the inductance 14 of the oscillating current path in the short circuit state exceeds a limited value, The power electronic module 13 is disconnected first, and then the mechanical switch module 12 is quickly disconnected. When the voltage between the second lead-out terminal 2 of the first combined circuit and the first lead-out terminal 3 of the second combined circuit exceeds the action of the voltage limiter 15 voltage, the voltage limiter 15 acts to consume the excess energy stored on the inductance of the first combined loop.

实施例2Example 2

图3所示为本发明的实施例2。图3中的电容53的两端分别连接在初始电流回路23的两端。Figure 3 shows Embodiment 2 of the present invention. The two ends of the capacitor 53 in FIG. 3 are respectively connected to the two ends of the initial current loop 23 .

实施例3Example 3

图4所示为本发明的实施例3,在第一组合回路第二引出端子2和第一组合回路电容的一端33之间加入电容预充电电路41,预充电电路41由预充电电阻44、预充电开关45和预充电旁路开关46组成,预充电电阻44的一端与预充电开关45的一端连接,预充电电阻44的另一端作为预充电电路41的第一引出端子与预充电旁路开关46一端连接,预充电开关45的另一端作为预充电电路41的第二引出端子与预充电旁路开关46的另一端连接。在系统刚启动时,预充电开关45闭合,预充电旁路开关46断开,对短路态震荡电流通路电容和第一组合回路电容进行预充电,充电完成后,预充电开关45断开,预充电旁路开关46闭合。Fig. 4 shows that embodiment 3 of the present invention, adds the capacitor pre-charging circuit 41 between the second lead-out terminal 2 of the first combined circuit and one end 33 of the first combined circuit capacitor, and the pre-charging circuit 41 is composed of a pre-charging resistor 44, The pre-charging switch 45 and the pre-charging bypass switch 46 are composed of one end of the pre-charging resistor 44 connected to one end of the pre-charging switch 45, and the other end of the pre-charging resistor 44 is used as the first lead-out terminal of the pre-charging circuit 41 to connect with the pre-charging bypass One end of the switch 46 is connected, and the other end of the pre-charging switch 45 is connected to the other end of the pre-charging bypass switch 46 as the second lead-out terminal of the pre-charging circuit 41 . When the system is just started, the pre-charge switch 45 is closed, and the pre-charge bypass switch 46 is disconnected to pre-charge the short-circuit oscillating current path capacitor and the first combined circuit capacitor. Charge bypass switch 46 is closed.

在第二组合回路第一引出端子3和第二组合回路电容的一端32之间加入电容预充电电路52,预充电电路52由预充电电阻50,预充电开关51,和预充电旁路开关49组成,预充电电阻50的一端与预充电开关51的一端连接,预充电电阻50的另一端作为预充电电路52的第一引出端子与预充电旁路开关49一端连接,预充电开关51的另一端作为预充电电路52的第二引出端子与预充电旁路开关49的另一端连接。在系统刚启动时,预充电开关51闭合,预充电旁路开关49断开,对第二组合回路电容进行预充电,充电完成后,预充电开关51断开,预充电旁路开关49闭合。A capacitor pre-charging circuit 52 is added between the first lead-out terminal 3 of the second combined circuit and one end 32 of the second combined circuit capacitor. The pre-charging circuit 52 is composed of a pre-charging resistor 50, a pre-charging switch 51, and a pre-charging bypass switch 49. One end of the pre-charging resistor 50 is connected to one end of the pre-charging switch 51, the other end of the pre-charging resistor 50 is connected to one end of the pre-charging bypass switch 49 as the first lead-out terminal of the pre-charging circuit 52, and the other end of the pre-charging switch 51 One end is connected to the other end of the precharge bypass switch 49 as the second lead-out terminal of the precharge circuit 52 . When the system is just started, the pre-charging switch 51 is closed, the pre-charging bypass switch 49 is opened, and the capacitor of the second combined circuit is pre-charged. After charging is completed, the pre-charging switch 51 is opened, and the pre-charging bypass switch 49 is closed.

实施例4Example 4

图5为本发明的实施例4,在第一组合回路电容的两端并联了限压器47,在第二组合回路电容的两端并联了限压器48。当第一组合回路电容两端电压超过限值时,限压器47耗散掉多余能量,限制第一组合回路电容两端电压。当第二组合回路电容两端电压超过限值时,限压器48耗散掉多余能量,限制第二组合回路电容两端电压,初始电流通路的两端也并联了限压器15。Fig. 5 is Embodiment 4 of the present invention, a voltage limiter 47 is connected in parallel at both ends of the capacitor of the first combined circuit, and a voltage limiter 48 is connected in parallel at both ends of the capacitor of the second combined circuit. When the voltage across the capacitor of the first combined loop exceeds the limit value, the voltage limiter 47 dissipates excess energy to limit the voltage across the capacitor of the first combined loop. When the voltage across the capacitor of the second combined loop exceeds the limit, the voltage limiter 48 dissipates excess energy to limit the voltage across the capacitor of the second combined loop, and the voltage limiter 15 is also connected in parallel to the two ends of the initial current path.

实施例5Example 5

图6为本发明的实施例5。由于换流站一般配有电抗器,且线路本身具有电感效应,可以以换流站代替实施例1中的电感11和电感14,因此第一组合回路的电感用直流输电线55代替,即第一组合回路仅包括一个电容;Fig. 6 is Embodiment 5 of the present invention. Since the converter station is generally equipped with a reactor, and the line itself has an inductance effect, the inductance 11 and the inductance 14 in Embodiment 1 can be replaced by a converter station, so the inductance of the first combined circuit is replaced by a DC transmission line 55, that is, the first A combined circuit includes only one capacitor;

实施例6Example 6

图7为本发明的另一应用与双向断路工况的实施例,采用特殊机械断路器,可以用直流输电线57代替实施例1中的电力电子模块13,机械断路器可阻断双向故障电流;Fig. 7 is another application of the present invention and an embodiment of the bidirectional circuit breaking condition. A special mechanical circuit breaker can be used to replace the power electronic module 13 in Embodiment 1 with a DC transmission line 57. The mechanical circuit breaker can block the bidirectional fault current ;

实施例7Example 7

图8作为本发明的另一应用与双极性柔性直流输电时的实施例,第一断路器60的第一引出端子61与双极输电线路的正极连接,第一断路器60的第二引出端子62与模拟短路电阻一端连接,第一断路器60的第三引出端子66和第四引出端子67与地连接。第二断路器65的第一引出端子63与双极输电线路的负极连接,第二断路器65的第二引出端子64与模拟短路电阻的另一端连接,第二断路器的第三引出端子68和第四引出端子69与地连接。Fig. 8 is another application of the present invention and an embodiment of bipolar flexible direct current transmission, the first lead-out terminal 61 of the first circuit breaker 60 is connected to the positive pole of the bipolar power transmission line, the second lead-out terminal 61 of the first circuit breaker 60 The terminal 62 is connected to one end of the analog short-circuit resistor, and the third lead-out terminal 66 and the fourth lead-out terminal 67 of the first circuit breaker 60 are connected to the ground. The first lead-out terminal 63 of the second circuit breaker 65 is connected with the negative pole of the bipolar transmission line, the second lead-out terminal 64 of the second circuit breaker 65 is connected with the other end of the simulated short-circuit resistance, and the third lead-out terminal 68 of the second circuit breaker And the fourth lead-out terminal 69 is connected to the ground.

实施例8Example 8

图9作为本发明的另一应用与双向断路工况的实施例,初始电流通路73中的电力电子模块70由采用相互反向的第一电力电子全控器件串联结构71和第二电力电子全控器件串联结构72,可以导通两个方向的电流,并可阻断两个方向的故障电流;实现双向保护功能。Fig. 9 is another application of the present invention and an embodiment of the bidirectional disconnection working condition. The power electronic module 70 in the initial current path 73 is composed of a series structure 71 of the first power electronic full control device and a second power electronic full control device reversed to each other. The control device series structure 72 can conduct current in two directions, and can block fault current in two directions; realizing a bidirectional protection function.

实施例9Example 9

图10作为本发明的实施例9,初始电流通路仅由电力电子模块223组成,电力电子模块由多个全控型器件串联组成,具备更快的关断速度。Fig. 10 is Embodiment 9 of the present invention, the initial current path is only composed of the power electronic module 223, and the power electronic module is composed of a plurality of full-control devices in series, which has a faster shutdown speed.

实施例10Example 10

图11作为本发明的实施例10,初始电流通路仅由电力电子模块223组成,电力电子模块由全控型器件串联模块214和半控型器件串联模块215组成,全控型器件串联模块和半控型器件串联模块两端均并联了限压器件;所述全控型器件串联模块214由至少一个的全控型器件串联组成,如IGBT,IGCT等;半控型器件串联模块215由至少一个的半控型器件串联组成,如晶闸管等。当系统出现短路故障时,半控型器件串联模块215与全控型器件串联模块215同时收到关断信号,全控型器件串联模块215直接关断,流经初始电流通路上的电流被瞬间阻断,半控型器件串联模块215电流过零自然关断。Fig. 11 is embodiment 10 of the present invention, the initial current path is only made up of power electronic module 223, and power electronic module is made up of fully controlled type device series module 214 and semi-controlled type device series module 215, fully controlled type device series module and semi-controlled device series module Both ends of the controlled device series module are connected in parallel with voltage limiting devices; the fully controlled device series module 214 is composed of at least one fully controlled device connected in series, such as IGBT, IGCT, etc.; the semi-controlled device series module 215 is composed of at least one Semi-controlled devices connected in series, such as thyristors, etc. When a short-circuit fault occurs in the system, the semi-controlled device series module 215 and the fully-controlled device series module 215 receive a shutdown signal at the same time, and the fully-controlled device series module 215 is directly turned off, and the current flowing through the initial current path is instantaneously interrupted. Blocking, the semi-controlled device series module 215 is naturally turned off when the current crosses zero.

实施例11Example 11

图12作为本发明的实施例11,初始电流通路仅由电力电子模块223组成,电力电子模块由全控型器件反向串联模块216和半控型器件反并联模块216组成,半控型器件反并联模块216由至少一个的反并联晶闸管串联组成。所述直流断路器具备双向故障电流阻断能力。Figure 12 is an embodiment 11 of the present invention. The initial current path is only composed of a power electronic module 223. The power electronic module is composed of a full-controlled device reverse series module 216 and a half-controlled device anti-parallel module 216. The half-controlled device is reversed. The parallel module 216 is composed of at least one anti-parallel thyristor connected in series. The DC circuit breaker has bidirectional fault current blocking capability.

实施例12Example 12

图13作为本发明的实施例12,初始电流通路23由第一开关单元323,初始电流通路第一电容开关组合电路133,初始电流通路第二电容开关组合电路233组成。第一电容开关组合电路133由开关单元123,电容单元317,预充电电阻150,预充电电阻旁路开关149组成,预充电旁路开关的一端与开关单元123的一端连接作为第一电容开关组合电路的第一引出端子与初始电流通路开关单元323的一端连接,预充电旁路开关的另一端与第一电容开关组合电路电容317的一端连接,第一电容开关组合电路电容317的另一端与地连接。预充电电阻并联在预充电电阻旁路开关的两端,第一电容开关组合电路133开关模块123的另一端与第二电容开关组合电路233的第一引出端子连接。FIG. 13 is the embodiment 12 of the present invention. The initial current path 23 is composed of the first switch unit 323 , the initial current path first capacitive switch combination circuit 133 , and the initial current path second capacitive switch combination circuit 233 . The first capacitor switch combination circuit 133 is made up of switch unit 123, capacitor unit 317, precharge resistor 150, and precharge resistor bypass switch 149. One end of the precharge bypass switch is connected with one end of switch unit 123 as the first capacitor switch combination The first lead-out terminal of the circuit is connected to one end of the initial current path switch unit 323, the other end of the pre-charging bypass switch is connected to one end of the first capacitor switch combination circuit capacitor 317, and the other end of the first capacitor switch combination circuit capacitor 317 is connected to the first capacitor switch combination circuit capacitor 317. ground connection. The pre-charging resistor is connected in parallel with both ends of the bypass switch of the pre-charging resistor, and the other end of the switching module 123 of the first capacitive switch combination circuit 133 is connected with the first lead-out terminal of the second capacitive switch combination circuit 233 .

第二电容开关组合电路233由开关单元223,电容单元417,预充电电阻250,预充电电阻旁路开关249,预充电旁路开关249的一端与开关模块223的一端连接作为第二电容开关组合电路的第一引出端子与第二电容开关组合电路的一端连接,预充电旁路开关的另一端与第二电容开关组合电路电容417的一端连接,第二电容开关组合电路电容417的另一端与地连接。预充电电阻并联在预充电电阻旁路开关的两端,第二电容开关组合电路233开关模块223的另一端与第二组合电路的第一引出端子连接。The second capacitor switch combination circuit 233 is composed of a switch unit 223, a capacitor unit 417, a precharge resistor 250, a precharge resistor bypass switch 249, and one end of the precharge bypass switch 249 is connected to an end of the switch module 223 as a second capacitor switch combination. The first lead-out terminal of the circuit is connected to one end of the second capacitor switch combined circuit, the other end of the pre-charge bypass switch is connected to one end of the second capacitor switch combined circuit capacitor 417, and the other end of the second capacitor switch combined circuit capacitor 417 is connected to ground connection. The pre-charging resistor is connected in parallel with both ends of the bypass switch of the pre-charging resistor, and the other end of the switch module 223 of the second capacitive switch combination circuit 233 is connected with the first lead-out terminal of the second combination circuit.

在直流输电系统正常运行时,初始电流通路第一开关单元323,第一电容开关组合电路开关单元123,第二电容开关组合电路开关单元223均处于闭合状态,当检测到直流输电线路短路故障时,初始电流通路第一开关单元323断开,然后第一电容开关组合电流开关单元123断开,然后第二电容开关组合电路开关单元223断开。近变流站24的电流流经第一组合回路电感对第一组合回路电容充电,第一组合回路电容电压上升并最终抑制短路电流使其逐渐衰减至零。短路点电流流经第二组合回路电容,第二组合回路电感、输电线路、短路点25形成回路,并最终震荡衰减至零。When the DC transmission system is in normal operation, the initial current path first switch unit 323, the first capacitor switch combination circuit switch unit 123, and the second capacitor switch combination circuit switch unit 223 are all in a closed state, when a short circuit fault of the DC transmission line is detected , the initial current path first switch unit 323 is disconnected, then the first capacitor switch combination current switch unit 123 is disconnected, and then the second capacitor switch combination circuit switch unit 223 is disconnected. The current near the converter station 24 flows through the inductance of the first combined loop to charge the capacitor of the first combined loop, and the voltage of the capacitor of the first combined loop rises and finally suppresses the short-circuit current to gradually decay to zero. The current at the short-circuit point flows through the capacitor of the second combined loop, the inductance of the second combined loop, the transmission line, and the short-circuit point 25 form a loop, and finally the oscillation attenuates to zero.

Claims (13)

1. a DC circuit breaker, is characterized in that: described DC circuit breaker is by initial current path (23), and the first combined loop (21) and the second combined loop (22) form; First leading-out terminal of initial current path (23) is connected with the second leading-out terminal of the first combined loop (21), and the second leading-out terminal of initial current path (23) is connected with the first leading-out terminal of the second combined loop (22); First leading-out terminal of the first combined loop (21) is connected with DC transmission line as the first leading-out terminal of DC circuit breaker, second leading-out terminal of the second combined loop (22) is connected with the other end of DC transmission line as the second leading-out terminal of DC circuit breaker, and described initial current path comprises electric power electronic module (13) and mechanical switch module (12); The first described combined loop comprises an inductance (11), an electric capacity (16) and a built-in machines switch (61), the second described combined loop comprises an inductance (14), an electric capacity (17) and charging circuit thereof, and described charging circuit is made up of built-in switch (49) and resistance (50); The built-in switch (49) of the second described combined loop charging circuit is made up of mechanical switch module or electronic power switch module.
2. according to DC circuit breaker according to claim 1, it is characterized in that: after line short fault being detected, start immediately to cut off initial current path (23); Disconnected initial current path (23) completely in the past, first combined loop (21) and the second combined loop (22) make initial current path (23) two ends potential difference brought can in tolerance range at the electric power electronic module (13) of initial current path, and the first combined loop (21) and the second combined loop (22) are respectively fault current provides freewheeling path, so that initial current path (23) disconnects; After initial current path (23) disconnects completely, fault current respectively by the first combined loop (21) and the second combined loop (22) afterflow, and gradually decay or oscillatory extinction to zero or by the built-in machines switch of the first combined loop (21) and the built-in switch of the second combined loop (22) in current zero-crossing point disjunction respectively.
3. according to DC circuit breaker according to claim 1, it is characterized in that: the mechanical switch module (12) in described initial current path comprises at least one mechanical switch series component, the electric power electronic module (13) in described initial current path comprises at least one power electronics and entirely controls devices in series assembly, one end of mechanical switch module (12) in initial current path is connected with one end of electric power electronic module (13), and the other end of the mechanical switch module (12) in initial current path is as the first leading-out terminal of initial current path, the other end of electric power electronic module is connected with the first leading-out terminal of the second combined loop (22) as the second leading-out terminal of initial current path, the one end of inductance (11) in the first described combined loop is connected with DC transmission line as first leading-out terminal (1) of the first combined loop, the other end of the inductance (11) in the first described combined loop is connected with one end of the first combined loop built-in machines switch (61), the other end of built-in machines switch (61) is connected with one end of the electric capacity (16) in the first combined loop, and the second leading-out terminal (2) as the first combined loop (21) is connected with the first leading-out terminal of initial current path (23), the other end of the electric capacity (16) in the first combined loop is as three terminal (8) the directly ground connection or connect the neutral line of the first combined loop, one end of the built-in switch (49) of the second described combined loop charging circuit is connected the first leading-out terminal (101) as the second combined loop charging circuit with one end of the resistance (50) of the second combined loop charging circuit, the other end of the other end of the built-in switch (49) of the second combined loop charging circuit and the resistance (50) of the second combined loop charging circuit is as second leading-out terminal (102) of the second combined loop charging circuit, one end of inductance (14) in second combined loop is connected with the second combined loop charging circuit first leading-out terminal (101), as first leading-out terminal (3) of the second combined loop (22), second leading-out terminal (102) of described second combined loop charging circuit is connected with one end of the electric capacity (17) in the second combined loop, the other end of the inductance (14) in the second combined loop is as the second leading-out terminal of the second combined loop (22), the other end of the electric capacity (17) in the second combined loop is as three terminal (7) the directly ground connection or connect the neutral line of the second combined loop (22).
4. according to DC circuit breaker according to claim 3, it is characterized in that: when DC power transmission line fault-free, mechanical switch module (12) and the electric power electronic module (13) of described initial current path are all in closure state, when detecting that the electric current that the inductance (11) in the inductance in the second combined loop (14) or the first combined loop flows through exceedes limit value, first the electric power electronic module (13) of initial current path disconnects, and then the mechanical switch module (12) of initial current path disconnects rapidly; The built-in switch (49) making the built-in machines switch (61) of the first combined loop and the second combined loop is afterwards the cutoff circuit when the current zero-crossing point of the first combined loop and the second combined loop respectively, thus realizes the disjunction to whole faulty line.
5. according to DC circuit breaker according to claim 3, it is characterized in that: when DC power transmission line fault-free, mechanical switch module (12) and the electric power electronic module (13) of described initial current path are all in closure state, when detecting that the electric current that the inductance (11) in the inductance in the second combined loop (14) or the first combined loop flows through exceedes limit value, the mechanical switch module (12) of initial current path first starts to disconnect, and then the electric power electronic module (13) of initial current path disconnects; The built-in switch (49) making the built-in machines switch (61) of the first combined loop and the second combined loop is afterwards the cutoff circuit when the current zero-crossing point of the first combined loop and the second combined loop respectively, thus realizes the disjunction to whole faulty line.
6. according to DC circuit breaker according to claim 3, it is characterized in that: at initial current path (23) two ends shunt capacitance (53).
7. according to DC circuit breaker according to claim 3, it is characterized in that: serial capacitance pre-charge circuit between one end (32) of the electric capacity in first leading-out terminal (3) and the second combined loop of the second combined loop; Or serial capacitance pre-charge circuit between one end (33) of electric capacity in first leading-out terminal (2) and the first combined loop of the first combined loop.
8. according to DC circuit breaker according to claim 3, it is characterized in that: the electric capacity two ends in the first combined loop and the electric capacity two ends in the second combined loop voltage limiter in parallel; Or at the two ends of initial current path (23) difference voltage limiter in parallel.
9. according to DC circuit breaker according to claim 3, it is characterized in that: the first described combined loop only comprises an electric capacity (16) and built-in machines switch (61), replace the inductance (11) in the first combined loop by DC transmission line.
10. according to DC circuit breaker according to claim 3, it is characterized in that: described initial current path only comprises mechanical switch module (12), replace the electric power electronic module (13) in initial current path with power transmission line.
11., according to DC circuit breaker according to claim 3, is characterized in that: the first described combined loop only comprises a built-in machines switch (61), replace the inductance (11) in the first combined loop by DC transmission line.
12., according to DC circuit breaker according to claim 3, is characterized in that: described initial current path only comprises electric power electronic module (13), replace the mechanical switch module (12) in initial current path with power transmission line.
13., according to DC circuit breaker according to claim 1, is characterized in that: in bipolarity transmission line, and described DC circuit breaker is installed for reference point is symmetrical with the neutral line or earth point.
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