WO2022237023A1 - 一种可变频可控电流源融冰装置 - Google Patents

一种可变频可控电流源融冰装置 Download PDF

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Publication number
WO2022237023A1
WO2022237023A1 PCT/CN2021/117932 CN2021117932W WO2022237023A1 WO 2022237023 A1 WO2022237023 A1 WO 2022237023A1 CN 2021117932 W CN2021117932 W CN 2021117932W WO 2022237023 A1 WO2022237023 A1 WO 2022237023A1
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Prior art keywords
voltage source
type converter
converter valve
valve group
phase
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PCT/CN2021/117932
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English (en)
French (fr)
Inventor
傅闯
周月宾
许树楷
李欢
魏伟
马晓红
孙鹏
班国邦
熊岩
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南方电网科学研究院有限责任公司
中国南方电网有限责任公司
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Publication of WO2022237023A1 publication Critical patent/WO2022237023A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/16—Devices for removing snow or ice from lines or cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the present application relates to the technical field of deicing power transmission lines, in particular to a frequency-variable and controllable current source deicing device.
  • the present application provides a frequency-variable and controllable current source ice-melting device, which is used to solve the technical problems of poor controllability and limited application occasions of the existing ice-melting technology, resulting in low ice-melting efficiency.
  • variable frequency controllable current source ice melting device including: a voltage source type converter valve and an isolation knife switch;
  • the voltage source type converter valve includes a first voltage source type converter valve group, a second voltage source type converter valve group and a third voltage source type converter valve group;
  • the input end of the first voltage source type converter valve group is connected to the AC power input, and the output end of the first voltage source type converter valve group is connected to the first phase deicing circuit;
  • the input end of the second voltage source type converter valve group is connected to the AC power input, and the output end of the second voltage source type converter valve group is connected to the second phase deicing circuit;
  • the input end of the third voltage source type converter valve group is connected to the AC power input, and the output end of the third voltage source type converter valve group is connected to the third phase deicing circuit;
  • the isolation knife switch is arranged on the first-phase ice-melting circuit, the second-phase ice-melting circuit and the third-phase ice-melting circuit, and is used to control circuit on-off.
  • the first voltage source type converter valve group, the second voltage source type converter valve group and the third voltage source type converter valve group each include two voltage source type converter valves or Three voltage source converter valves.
  • the two voltage source converter valves are respectively connected to any two input phases of the AC power supply, or the three voltage source converter valves are respectively connected to three phases of the AC power supply. Input phase up.
  • each of the voltage source converter valves includes an inductor and at least one single-phase full-bridge converter;
  • the inductor is connected in series with the single-phase full-bridge converter.
  • the single-phase full-bridge converter includes preset full-control devices and capacitor devices.
  • the output ends of the first-phase ice-melting circuit, the second-phase ice-melting circuit and the third-phase ice-melting circuit are short-circuited two by two through a short circuit switch.
  • a variable frequency controllable current source ice melting device including: a voltage source type converter valve and an isolation knife switch; the voltage source type converter valve includes a first voltage source type converter valve group, a second A voltage source type converter valve group and a third voltage source type converter valve group; the input end of the first voltage source type converter valve group is connected to the AC power input, and the output end of the first voltage source type converter valve group Connected to the first-phase ice-melting circuit; the input end of the second voltage source type converter valve group is connected to the AC power input, and the output end of the second voltage source type converter valve group is connected to the second-phase ice-melting circuit; The input end of the third voltage source type converter valve group is connected to the AC power input, and the output end of the third voltage source type converter valve group is connected to the third phase ice melting circuit; the isolation knife switch is set on the first phase melting circuit.
  • the ice circuit, the second-phase ice-melting circuit and the third-phase ice-melting circuit are used to control
  • the variable frequency controllable current source deicing device provided by this application is equipped with a voltage source type converter valve group on a three-phase circuit, and different voltage source type converter valve groups are distributed on different single-phase deicing circuits, and the circuit
  • the isolation switch is used for on-off control, so that the three-phase circuit can be melted at the same time by one control operation; the circuit structure is simple, and it can melt ice for different wires according to the adjustment of the isolation switch, which is universal. It can be applied to wire melting in various scenarios; the isolation switch is easy to operate. Therefore, the present application can solve the technical problems of poor controllability and limited application occasions of the existing ice-melting technology, resulting in low ice-melting efficiency.
  • Fig. 1 is a schematic structural diagram of a variable-frequency controllable current source ice-melting device provided by an embodiment of the present application;
  • Fig. 2 is a schematic diagram of the operating circuit of the ground wire melting process provided by the embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a static synchronization compensation circuit provided by an embodiment of the present application.
  • Fig. 4 is a circuit topology diagram of another variable-frequency controllable current source ice-melting device provided by the embodiment of the present application;
  • Fig. 5 is a schematic diagram of the operating circuit of another variable-frequency controllable current source ice-melting device provided by the embodiment of the present application during the ice-melting process with the ground wire;
  • Fig. 6 is a circuit structure diagram of another variable frequency controllable current source deicing device as a static synchronous compensation device provided by the embodiment of the present application;
  • Fig. 7 is a circuit topology diagram of a third variable-frequency controllable current source ice-melting device provided by the embodiment of the present application.
  • Fig. 8 is a schematic diagram of the operating circuit of the third variable-frequency controllable current source ice-melting device provided by the embodiment of the present application during the ice-melting process with the ground wire;
  • Fig. 9 is a circuit structure diagram of the third variable frequency controllable current source deicing device as a static synchronous compensation device provided by the embodiment of the present application;
  • FIG. 10 is a schematic diagram of a circuit structure of a single full-control device provided in an embodiment of the present application.
  • Figure 11 is a schematic diagram of the circuit structure of the parallel connection of dual full-control devices provided by the embodiment of the present application.
  • Fig. 12 is a schematic diagram of the circuit structure of multiple full-control devices connected in parallel provided by the embodiment of the present application;
  • Fig. 13 is a schematic circuit diagram of the ice-melting device for melting overhead ground wires or optical fiber composite ground wires (OPGW) under the condition that the voltage source converter valve group provided by the embodiment of the present application includes two voltage source converter valves ;
  • OPGW optical fiber composite ground wires
  • Fig. 14 is a schematic circuit diagram of an ice-melting device for melting overhead ground wires or optical fiber composite ground wires (OPGW) under the condition that the voltage source converter valve group provided by the embodiment of the present application includes three voltage source converter valves ;
  • OPGW optical fiber composite ground wires
  • the first voltage source type converter valve group 2. The second voltage source type converter valve group; 3. The third voltage source type converter valve group.
  • the existing controllable ice-melting device for the power grid has the operating characteristics of a controllable DC current source, and at least two steps are required to melt the ice of the three-phase conductors of the AC transmission line.
  • Icing is the wiring method of connecting two-phase wires in series to form a DC current loop; the second step is to use the "one-to-two-phase" method to remove the ice coating on the other phase wire, which is to connect the two-phase wires to the third wire after the ice is melted.
  • Phase conductors are connected in series to form a DC current loop.
  • the three-phase wire needs two steps to complete, and the efficiency is low.
  • the frequency-variable and controllable current source ice-melting device proposed in this application can complete the ice-melting of three-phase wires at the same time with only one operation.
  • variable-frequency controllable current source ice-melting device including: a voltage source type converter valve and an isolation knife switch;
  • the voltage source type converter valve includes a first voltage source type converter valve group 1, a second voltage source type converter valve group 2 and a third voltage source type converter valve group 3; these three voltage source type converter valve groups
  • the structure and specifications are exactly the same.
  • the input end of the first voltage source type converter valve group 1 is connected to the AC power input, and the output end of the first voltage source type converter valve group 1 is connected to the first phase ice-melting circuit;
  • the second voltage source type converter The input end of the valve group 2 is connected to the AC power input, and the output end of the second voltage source type converter valve group 2 is connected to the second phase ice-melting circuit;
  • the input end of the third voltage source type converter valve group 3 is connected to the The AC power input is connected, and the output terminal of the third voltage source type converter valve group 3 is connected with the third-phase deicing circuit.
  • Each single-phase ice-melting circuit is distributed with a voltage source type converter valve group; the current frequency of the input phase of the AC power supply can be adjusted within the range of 0-50/3Hz, according to the category of the ice-melting line and the actual application scenario Perform current regulation.
  • the AC power is connected through the 10KV or 35KV busbar in Figure 1, and the connection is controlled by the isolation switch K1 and K2, and the circuit breaker QF.
  • the isolating knife switch is arranged on the first-phase ice-melting circuit, the second-phase ice-melting circuit and the third-phase ice-melting circuit, and is used to control the on-off of the circuits.
  • Different loops can be obtained by adjusting the isolation switch on the line, and different loops are different functional circuits.
  • Figure 2 shows the ice melting circuit. Close the corresponding isolation switch on the ice melting circuit of each phase to make the three-phase circuit conduction, so that the three-phase wires can be melted at the same time.
  • the ice-melting device can only be used for ice-melting during the annual ice-covered period. If the ice-melting device can operate in the mode of static synchronous compensation device during the non-icing period, it can not only significantly improve the utilization rate of the equipment, but also make the ice-melting device The reactive power adjustment and dynamic reactive power support capabilities of the substation are improved, and the availability of the ice-melting device can also be ensured during the ice-covered period. Therefore, it is also possible to perform on-off control on the inside of the second voltage source type converter valve group 2 by adding some isolation switches (such as Scwl, Scw2, Sbv1, Sbv2, Scv, Scu). For example, please refer to Figure 1 and Figure 3, if the isolation switch Scv2 and the isolation switch Scu are closed, the circuit shown in Figure 3 can be obtained, and the static synchronous compensation device is obtained without connecting to the ice-melting bus.
  • isolation switches such as Scwl, Scw2, Sbv1, Sbv2, Scv, S
  • the variable-frequency controllable current source ice-melting device provided in the embodiment of the present application is provided with a voltage source type converter valve group on a three-phase circuit, and different voltage source type converter valve groups are distributed on different single-phase ice-melting circuits.
  • the isolation knife switch is used for on-off control in the circuit, so that the three-phase circuit can be melted at the same time by one control operation; the circuit structure is simple, and different wires can be melted according to the adjustment of the isolation knife switch, which is more universal Strong, it can be applied to wire melting in various scenarios; the control of the isolation knife switch is easy to implement. Therefore, the embodiments of the present application can solve the technical problems of poor controllability and limited application occasions of the existing ice-melting technology, resulting in low ice-melting efficiency.
  • first voltage source type converter valve group 1, the second voltage source type converter valve group 2 and the third voltage source type converter valve group 3 all include two voltage source type converter valves or three voltage source type diverter valve.
  • the two voltage source type converter valves are respectively connected to any two input phases of the AC power supply, or the three voltage source type converter valves are respectively connected to the three input phases of the AC power source.
  • the voltage source type converter valve group includes two voltage source type converter valves (ie SM1...SMn in Fig.
  • the voltage source converter valve two voltage source converter valves are connected in parallel in each single-phase deicing circuit, and the deicing circuit formed by the on-off control through the isolation knife gate is shown in Figure 2, and the static synchronous compensation device formed is shown in Figure 2 3.
  • each AC power input phase is connected in parallel with three voltage source converter valves, and the one connected to the single-phase deicing circuit
  • the line includes three voltage source converter valves.
  • the ice melting circuit formed by on-off control through the isolation knife switch is shown in Figure 8, and the static synchronous compensation device formed is shown in Figure 9.
  • each voltage source type converter valve includes an inductor and at least one single-phase full-bridge converter; the inductor is connected in series with the single-phase full-bridge converter.
  • the single-phase full-bridge converter includes a preset full-control device and a capacitor device.
  • the inductor is installed near the input phase end of the AC power supply, and is connected in series with the single-phase full-bridge converter to connect the output phase to the single-phase ice-melting circuit.
  • Each preset fully controlled device includes a diode in antiparallel with it.
  • the preset full-control device can use a single full-control device, please refer to Figure 10 for the specific structure; in addition to using a single full-control device, you can also use double full-control devices in parallel, see Figure 11 for the specific structure; and , multiple full-control devices can also be connected in parallel, please refer to Figure 12 for the specific structure.
  • the output terminals of the first-phase ice-melting circuit, the second-phase ice-melting circuit and the third-phase ice-melting circuit are short-circuited in pairs by short-circuit switches.
  • FIG. 13 shows the deicing device for the overhead ground wire or optical fiber composite ground wire (OPGW) under the condition that the voltage source type converter valve group includes two voltage source type converter valves.
  • FIG. 14 is a schematic circuit diagram of the deicing device for the overhead ground wire or the optical fiber composite ground wire (OPGW) under the condition that the voltage source type converter valve group includes three voltage source type converter valves.
  • the ice-melting device provided by the embodiment of the present application can meet the ice-melting needs of various power transmission and distribution lines, and can better ensure the power quality in operating conditions, and has almost no impact on the AC system itself.
  • the preset full-control device is used to meet the current with a wide range of changes required for melting the ground wires, so that the ice-melting device can be used for melting ice of various ground wires.
  • the disclosed devices and methods may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions for executing all or part of the steps of the methods described in the various embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device, etc.).
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), random access memory (English full name: Random Access Memory, English abbreviation: RAM), magnetic Various media that can store program codes such as discs or optical discs.

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Abstract

一种可变频可控电流源融冰装置，包括：电压源型换流阀包括第一电压源型换流阀组（1）、第二电压源型换流阀组（2）和第三电压源型换流阀组（3）；第一电压源型换流阀组（1）的输入端与交流电源输入相连接，且第一电压源型换流阀组（1）的输出端与第一相融冰电路相连；第二电压源型换流阀组（2）的输入端与交流电源输入相连接，且第二电压源型换流阀组（2）的输出端与第二相融冰电路相连；第三电压源型换流阀组（3）的输入端与交流电源输入相连接，且第三电压源型换流阀组（3）的输出端与第三相融冰电路相连；隔离刀闸设置在第一相融冰电路、第二相融冰电路和第三相融冰电路上，用于控制电路通断。该装置能够解决现有融冰技术可控性较差，且应用场合受限，导致融冰效率较低的技术问题。

Description

一种可变频可控电流源融冰装置 技术领域
本申请涉及输电线融冰技术领域，尤其涉及一种可变频可控电流源融冰装置。
背景技术
电力系统遭受的各种自然灾害中，冰灾是最严重的威胁之一，覆冰使电力设备损坏、供电中断，不可控脱冰使灾害扩大，覆冰导致了国内外电网多次大面积瘫痪。随着现代化水平的不断提高，全社会对电力的依赖程度越来越高，对电力供应也提出了更高要求。近年来，全球各类气象灾害更为频繁，极端天气气候事件更显异常，冰灾造成电力系统的损失和影响更趋严重，破坏程度越来越强，影响也越来越复杂，应对难度也越来越大，电网急需及时、快速、可控、安全除冰手段。
电力系统线路覆冰的最大影响就是设备损坏，导致供电通信中断，进而导致大面积停电，且难以复电。现有的除冰技术可控性较差，且应用场合受限，实际的融冰过程效率较低。
发明内容
本申请提供了一种可变频可控电流源融冰装置，用于解决现有融冰技术可控性较差，且应用场合受限，导致融冰效率较低的技术问题。
有鉴于此，本申请第一方面提供了一种可变频可控电流源融冰装置，包括：电压源型换流阀和隔离刀闸；
所述电压源型换流阀包括第一电压源型换流阀组、第二电压源型换流阀组和第三电压源型换流阀组；
所述第一电压源型换流阀组的输入端与交流电源输入相连接，且所述第一电压源型换流阀组的输出端与第一相融冰电路相连；
所述第二电压源型换流阀组的输入端与交流电源输入相连接，且所述第二电压源型换流阀组的输出端与第二相融冰电路相连；
所述第三电压源型换流阀组的输入端与交流电源输入相连接，且所述第三电压源型换流阀组的输出端与第三相融冰电路相连；
所述隔离刀闸设置在所述第一相融冰电路、所述第二相融冰电路和所述第三相融冰电路上，用于控制电路通断。
可选的，所述第一电压源型换流阀组、所述第二电压源型换流阀组和所述第三电压源型换流阀组均包括两个电压源型换流阀或者三个电压源型换流阀。
可选的，所述两个电压源型换流阀分别连接于所述交流电源任意两个输入相上，或者，所述三个电压源型换流阀分别连接于所述交流电源的三个输入相上。
可选的，每个所述电压源型换流阀包括电感和至少一个单相全桥换流器；
所述电感与所述单相全桥换流器串联。
可选的，所述单相全桥换流器包括预置全控型器件和电容器件。
可选的，所述第一相融冰电路、所述第二相融冰电路和所述第三相融冰电路的输出端通过短路刀闸两两短接。
从以上技术方案可以看出，本申请实施例具有以下优点：
本申请中，提供了一种可变频可控电流源融冰装置，包括：电压源型换流阀和隔离刀闸；电压源型换流阀包括第一电压源型换流阀组、第二电压源型换流阀组和第三电压源型换流阀组；第一电压源型换流阀组的输入端与交流电源输入相连接，且第一电压源型换流阀组的输出端与第一相融冰电路相连；第二电压源型换流阀组的输入端与交流电源输入相连接，且第二电压源型换流阀组的输出端与第二相融冰电路相连；第三电压源型换流阀组的输入端与交流电源输入相连接，且第三电压源型换流阀组的输出端与第三相融冰电路相连；隔离刀闸设置在第一相融冰电路、第二相融冰电路和第三相融冰电路上，用于控制电路通断。
本申请提供的可变频可控电流源融冰装置，在三相电路上设置电压源型换流阀组，不同的电压源型换流阀组分布在不同的单相融冰电路上，且电路中采用隔离刀闸进行通断控制，使得一次控制操作就可以同时实现三相电路的融冰；电路结构简单，能够根据隔离刀闸的调整对不同的电线实现融冰， 普适性较强，可应用于多种场景下的电线融冰；隔离刀闸操控易执行。因此，本申请能够解决现有融冰技术可控性较差，且应用场合受限，导致融冰效率较低的技术问题。
附图说明
图1为本申请实施例提供的一种可变频可控电流源融冰装置的结构示意图；
图2为本申请实施例提供的导地线融冰过程运行回路示意图；
图3为本申请实施例提供的静止同步补偿电路结构示意图；
图4为本申请实施例提供的另一种可变频可控电流源融冰装置电路拓扑结构图；
图5为本申请实施例提供的另一种可变频可控电流源融冰装置导地线融冰过程运行回路示意图；
图6为本申请实施例提供的另一种可变频可控电流源融冰装置作静止同步补偿装置电路结构图；
图7为本申请实施例提供的第三种可变频可控电流源融冰装置电路拓扑结构图；
图8为本申请实施例提供的第三种可变频可控电流源融冰装置导地线融冰过程运行回路示意图；
图9为本申请实施例提供的第三种可变频可控电流源融冰装置作静止同步补偿装置电路结构图；
图10为本申请实施例提供的单全控型器件的电路结构示意图；
图11为本申请实施例提供的双全控型器件并联的电路结构示意图；
图12为本申请实施例提供的多个全控型器件并联的电路结构示意图；
图13为本申请实施例提供的电压源型换流阀组包括两个电压源型换流阀的情况下的融冰装置对架空地线或者光纤复合地线(OPGW)进行融冰的回路示意图；
图14为本申请实施例提供的电压源型换流阀组包括三个电压源型换流阀的情况下的融冰装置对架空地线或者光纤复合地线(OPGW)进行融冰的回 路示意图；
附图标记：
1、第一电压源型换流阀组；2、第二电压源型换流阀组；3、第三电压源型换流阀组。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
现有的电网可控融冰装置具有可控直流电流源运行特性，对交流输电线路三相导线融冰至少需要两步操作，第一步是采用“一相对一相”的方式去除两相导线覆冰，就是将两相导线串联形成直流电流回路的接线方式；第二步是采用“一相对两相”的方式去除另外一相导线覆冰，就是将两相导线完成融冰后与第三相导线串联形成直流电流回路的接线方式。显然，三相导线需要两步操作才能完成，效率较低。本申请中提出的可变频可控电流源融冰装置仅需要一次操作就可以同时完成三相电线的融冰。
为了便于理解，请参阅图1，本申请提供的一种可变频可控电流源融冰装置的实施例，包括：电压源型换流阀和隔离刀闸；
电压源型换流阀包括第一电压源型换流阀组1、第二电压源型换流阀组2和第三电压源型换流阀组3；这三个电压源型换流阀组的结构和规格完全相同。
第一电压源型换流阀组1的输入端与交流电源输入相连接，且第一电压源型换流阀组1的输出端与第一相融冰电路相连；第二电压源型换流阀组2的输入端与交流电源输入相连接，且第二电压源型换流阀组2的输出端与第二相融冰电路相连；第三电压源型换流阀组3的输入端与交流电源输入相连接，且第三电压源型换流阀组3的输出端与第三相融冰电路相连。每一个单相融冰电路上均分布了一个电压源型换流阀组；交流电源输入相的电流频率 可以在0-50/3Hz范围内调节，具体是根据融冰线路的类别和实际应用场景执行电流调节的。交流电源通过图1的10KV或35KV母线接入，由隔离刀闸K1和K2，以及断路器QF控制连接。
隔离刀闸设置在第一相融冰电路、第二相融冰电路和第三相融冰电路上，用于控制电路通断。通过调节线路上的隔离刀闸可以得到不同的回路，而不同回路则是不同的功能电路。例如，请参阅图2，如图2为融冰回路，合上各相融冰电路上相应的隔离刀闸，使得三相电路导通，从而同时对三相电线进行融冰处理。
另外，融冰装置仅在每年的覆冰期才可能用于融冰，如果在非覆冰期融冰装置能够以静止同步补偿装置模式运行，不但能够显著提高设备的利用率，也可使得融冰装置所在变电站无功调节和动态无功支撑能力得到提升，还能够确保融冰装置在覆冰期中的可用性。因此，还可以通过添加一些隔离刀闸(例如Scw1、Scw2、Sbv1、Sbv2、Scv、Scu)对第二电压源型换流阀组2内部进行通断控制。例如，请参阅图1和图3，如果闭合隔离刀闸Scv2和隔离刀闸Scu，即可得到图3所示的回路，不与融冰母线连接，得到静止同步补偿装置。
在电压源型换流阀组中并未添加任何隔离刀闸的时候，还存在一种电压源型换流阀组的拓扑结构，请参阅图4，由电压源型换流阀组构成的组合电路通过隔离刀闸S1、S2和S3与三相融冰电路连接。合上刀闸S1、S2和S3时，形成的融冰过程回路如图5所示。断开刀闸S1、S2和S3时，可以形成一个呈三角形连接关系的静止同步补偿装置，请参阅图6。
本申请实施例提供的可变频可控电流源融冰装置，在三相电路上设置电压源型换流阀组，不同的电压源型换流阀组分布在不同的单相融冰电路上，且电路中采用隔离刀闸进行通断控制，使得一次控制操作就可以同时实现三相电路的融冰；电路结构简单，能够根据隔离刀闸的调整对不同的电线实现融冰，普适性较强，可应用于多种场景下的电线融冰；隔离刀闸操控易执行。因此，本申请实施例能够解决现有融冰技术可控性较差，且应用场合受限，导致融冰效率较低的技术问题。
进一步地，第一电压源型换流阀组1、第二电压源型换流阀组2和第三电 压源型换流阀组3均包括两个电压源型换流阀或者三个电压源型换流阀。
进一步地，两个电压源型换流阀分别连接于交流电源任意两个输入相上，或者，三个电压源型换流阀分别连接于交流电源的三个输入相上。
可以理解的是，如图1为电压源型换流阀组包括两个电压源型换流阀(即图1中的SM1…SMn)的情况，任选两个交流电源输入相分别连接两个电压源型换流阀，每个单相融冰电路上并联两个电压源型换流阀，通过隔离刀闸进行通断控制形成的融冰回路如图2，形成的静止同步补偿装置如图3所示。
若是电压源型换流阀组包括三个电压源型换流阀，请参阅图7，每一条交流电源输入相都并联了三个电压源型换流阀，而连接到单相融冰电路的线路上则包括三个电压源型换流阀，通过隔离刀闸进行通断控制形成的融冰回路如图8所示，形成的静止同步补偿装置如图9所示。
进一步地，每个电压源型换流阀包括电感和至少一个单相全桥换流器；电感与单相全桥换流器串联。
进一步地，单相全桥换流器包括预置全控型器件和电容器件。
需要说明的是，电感安装在近交流电源输入相端，与单相全桥换流器串联后连接输出相至单相融冰电路。每个预置全控型器件包括一个与其反并联二极管。
预置全控型器件可以采用单全控型器件，具体的结构请参阅图10；除了可以采用单全控型器件以外，还可以采用双全控型器件并联，具体的结构请参阅图11；而且，还可以采用多个全控型器件并联，具体的结构请参阅图12。
进一步地，第一相融冰电路、第二相融冰电路和第三相融冰电路的输出端通过短路刀闸两两短接。
请参阅图1和图7，三条单相融冰电路的输出端通过隔离刀闸短接，具体的为Sab、Sbc所在的线路即为三相导线末端短接的电路，在对导线进行融冰操作时，Sg1、Sg2所在的短路线处于断开状态，使得三相融冰电路导通，形成导线融冰回路；在需要对架空地线以及光纤复合地线(OPGW)进行融冰时，Sg1、Sg2闭合，Sab、Sbc断开。请参阅图13和图14，图13为电压源型换流阀组包括两个电压源型换流阀的情况下的融冰装置对架空地线或者光纤复合地线(OPGW)进行融冰的回路示意图；图14为电压源型换流阀组包括 三个电压源型换流阀的情况下的融冰装置对架空地线或者光纤复合地线(OPGW)进行融冰的回路示意图。
可以发现，本申请实施例提供的融冰装置可以满足多种不同输配电线路的融冰需要，且在运行工况中能够较好的保证电能质量，对交流系统本身几乎没有影响。利用预置全控器件满足导地线融冰需要的变化范围很大的电流，使得该融冰装置可以用于各类导地线的融冰。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以通过一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(英文全称：Read-Only Memory，英文缩写：ROM)、随机存取存储器(英文全称：Random Access  Memory，英文缩写：RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (6)

  1. 一种可变频可控电流源融冰装置，其特征在于，包括：电压源型换流阀和隔离刀闸；
    所述电压源型换流阀包括第一电压源型换流阀组、第二电压源型换流阀组和第三电压源型换流阀组；
    所述第一电压源型换流阀组的输入端与交流电源输入相连接，且所述第一电压源型换流阀组的输出端与第一相融冰电路相连；
    所述第二电压源型换流阀组的输入端与交流电源输入相连接，且所述第二电压源型换流阀组的输出端与第二相融冰电路相连；
    所述第三电压源型换流阀组的输入端与交流电源输入相连接，且所述第三电压源型换流阀组的输出端与第三相融冰电路相连；
    所述隔离刀闸设置在所述第一相融冰电路、所述第二相融冰电路和所述第三相融冰电路上，用于控制电路通断。
  2. 根据权利要求1所述的可变频可控电流源融冰装置，其特征在于，所述第一电压源型换流阀组、所述第二电压源型换流阀组和所述第三电压源型换流阀组均包括两个电压源型换流阀或者三个电压源型换流阀。
  3. 根据权利要求2所述的可变频可控电流源融冰装置，其特征在于，所述两个电压源型换流阀分别连接于所述交流电源任意两个输入相上，或者，所述三个电压源型换流阀分别连接于所述交流电源的三个输入相上。
  4. 根据权利要求2所述的可变频可控电流源融冰装置，其特征在于，每个所述电压源型换流阀包括电感和至少一个单相全桥换流器；
    所述电感与所述单相全桥换流器串联。
  5. 根据权利要求4所述的可变频可控电流源融冰装置，其特征在于，所述单相全桥换流器包括预置全控型器件和电容器件。
  6. 根据权利要求1所述的可变频可控电流源融冰装置，其特征在于，所述第一相融冰电路、所述第二相融冰电路和所述第三相融冰电路的输出端通过短路刀闸两两短接。
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CN214590490U (zh) * 2021-05-14 2021-11-02 南方电网科学研究院有限责任公司 一种可变频可控电流源融冰装置

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