WO2021115019A1 - 海岛输电***及其控制方法 - Google Patents

海岛输电***及其控制方法 Download PDF

Info

Publication number
WO2021115019A1
WO2021115019A1 PCT/CN2020/128716 CN2020128716W WO2021115019A1 WO 2021115019 A1 WO2021115019 A1 WO 2021115019A1 CN 2020128716 W CN2020128716 W CN 2020128716W WO 2021115019 A1 WO2021115019 A1 WO 2021115019A1
Authority
WO
WIPO (PCT)
Prior art keywords
island
frequency
power
low
sea
Prior art date
Application number
PCT/CN2020/128716
Other languages
English (en)
French (fr)
Inventor
邓占锋
赵国亮
于弘洋
葛菁
刘依晗
Original Assignee
全球能源互联网研究院有限公司
国家电网有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 全球能源互联网研究院有限公司, 国家电网有限公司 filed Critical 全球能源互联网研究院有限公司
Priority to EP20900145.2A priority Critical patent/EP4075625A4/en
Publication of WO2021115019A1 publication Critical patent/WO2021115019A1/zh

Links

Images

Classifications

    • 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
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/42—The network being an on-board power network, i.e. within a vehicle for ships or vessels

Definitions

  • the present disclosure relates to the field of power transmission technology, for example, to an island power transmission system and a control method thereof.
  • Wind power generation is one of the most mature and large-scale development conditions among new energy power generation technologies.
  • the distribution of wind power resources and load centers are inversely distributed, and large-capacity long-distance power transmission is needed to achieve the optimal allocation of resources. Therefore, low-frequency power transmission technology can be used as the preferred method of low-frequency power transmission.
  • LFAC Low Frequency Alternating Current Transmission
  • the line inductance X L decreases with the decrease of frequency, which greatly reduces the impedance of the transmission line, which is equivalently shortened.
  • the electrical distance of the line; on the other hand, the capacitive reactance X C of the line increases with the decrease of frequency, which can reduce the reactive power of cable line charging and greatly increase the transmission capacity of the line. It is a promising future for island interconnection and offshore wind power grid-connected transmission One way.
  • the island power transmission system in the related technology usually uses a single substation or substation on one side to use low-frequency transmission cables to transmit power to the power supply equipment on the other side of the island.
  • the island power transmission system is only a substation or substation on the shore and the island. Establish a low-frequency power transmission relationship between. Since onshore substations or substations are used as the transmission terminal and the island is the terminal for power supply, only a single power transmission terminal can transmit power to the terminal for power supply. This makes the island’s power transmission method relatively simple, low reliability, and insufficient transmission capacity, which cannot meet the requirements of island networking. Power demand.
  • the present disclosure provides an island power transmission system and a control method thereof, to solve the problem that the island power transmission system in the related art has a single power transmission mode, low reliability, and insufficient power transmission capacity, and cannot meet the power supply demand of the island network.
  • a first island platform including: a new energy wind farm, an island control switch, a low-frequency bus collection port, and a first AC/AC frequency conversion device.
  • the first island platform is set to one of the following:
  • a second sea-island platform connected to the first sea-island platform through the low-frequency bus collection port, and configured to obtain the low-frequency electric energy collected and output by the low-frequency bus collection port;
  • the third sea-island platform is connected to the first sea-island platform through the low-frequency bus collection port, and is configured to obtain the low-frequency electric energy collected and output by the low-frequency bus collection port;
  • the first AC power grid is connected to the first island platform through a power transmission cable, and is configured to output power frequency electric energy to the first island platform;
  • the second AC power grid is connected to the first sea-island platform through a second AC/AC frequency conversion device and a power transmission cable, and is configured to output low-frequency electric energy to the first sea-island platform; or, through a bypass switch, the power transmission
  • the cable and the sea-island control switch are connected to the first sea-island platform, and are configured to output power frequency electric energy to the first sea-island platform.
  • sea-island power transmission which is used in the above-mentioned sea-island power transmission system, including:
  • the first AC power grid When the bypass switch device and the sea-island control switch are disconnected, the first AC power grid outputs the power frequency electric energy to the first sea-island platform, and the second AC power grid supplies the first power grid to the first sea-island platform.
  • the island platform outputs low-frequency electric energy, or, through the new energy wind farm, the first AC/AC frequency conversion device and the low-frequency bus collection port of the island power transmission system, respectively, to the second island platform and the third island of the island power transmission system
  • the platform outputs low-frequency electric energy;
  • the first AC power grid separately outputs power frequency electric energy to the first sea island platform
  • the The second AC power grid outputs low-frequency electric energy to the second island platform and the third island platform.
  • FIG. 1 is a schematic structural diagram of an island power transmission system provided by an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a second AC grid connected to an island power transmission system according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of another island power transmission system provided by an embodiment of the present invention.
  • FIG. 4 is a schematic circuit diagram of a second AC grid connected to an island power transmission system according to an embodiment of the present invention
  • Fig. 5 is a flow chart of a method for controlling low-frequency power transmission to an island according to an embodiment of the present invention.
  • the embodiment of the present invention provides an island power transmission system, as shown in FIG. 1, including: a first island platform 5, a second island platform 6, a third island platform 7, a first AC power grid 1 and a second AC power grid 2.
  • the first island platform 5 includes: a new energy wind farm 51, an island control switch 53, a low-frequency bus collection port 52, and a first AC/AC frequency conversion device 3.
  • the first island platform 5 here can be used as both a power supply platform and an electricity consumption platform.
  • the first island platform 5 is installed on each island or island for production operations or other activities.
  • the first island platform 5 can be used to extract oil through oil drilling on the island, and the first island platform 5 can also be used to extract coal resources on the island.
  • the first island platform 5 performs production operations, it needs to provide electrical energy to the electrical equipment of the production operations.
  • the first island on the island can be The low-frequency power transmission transformation of the platform 5 power supply can increase the transmission capacity, increase the transmission distance, save the cost of the transformation, and reduce the difficulty of construction.
  • the first island platform 5 can be used for island networking with other platforms on the island. Therefore, the first island platform 5 can be used as an intermediate hub platform on multiple islands.
  • a new energy wind farm 51, an island control switch 53, a low-frequency bus collection port 52, and a first AC/AC frequency conversion device 3 are provided on the first island platform 5.
  • the new energy wind farm 51 may be a plurality of wind power stations installed on the sea. Since the new energy wind farm 51 is a renewable energy source, it is inexhaustible and inexhaustible. Comprehensive utilization of wind energy can reduce the consumption of other energy sources, and to a large extent, can save other energy sources. In addition, wind energy is a clean energy source, which has less environmental pollution and is beneficial to ensuring a healthy life of residents.
  • the island control switch 53 is set to control the transmission line of the first island platform 5, and the low-frequency bus collection port 52 is set to collect the low-frequency electric energy of the transmission line.
  • the first island platform 5 is configured to provide electrical power to the electrical equipment in the island area by closing the island control switch 53 and the acquired power frequency and/or low frequency electrical energy and/or through the new energy wind farm 51.
  • the first island platform 5 can obtain power frequency power from the AC power grid on land, and can also obtain low frequency power from the AC power grid on land.
  • the first island platform 5 can use the power frequency power and/or low frequency power obtained to provide power to the island area.
  • Of electrical equipment to provide electrical energy When the first sea-island platform 5 uses low-frequency electric energy to provide electric power to the electric equipment in the sea-island area, it can be converted to industrial frequency electric power by the first AC/AC frequency conversion device 3 for power supply.
  • the first island platform 5 can also generate electrical energy through the new energy wind farm 51 to provide electrical energy to the electrical equipment in the island area.
  • the first island platform 5 can also output low-frequency power through the low-frequency bus collection port 52.
  • the low-frequency power can be obtained from the AC grid on the land through a low-frequency transmission cable. Then, the low-frequency power is transferred to the first island platform.
  • the low frequency bus converging port 52 on 5 converges.
  • the first island platform 5 can also output low-frequency electric energy through the new energy wind farm 51, the first AC/AC frequency conversion device 3 and the low-frequency bus collection port 52.
  • the power frequency power generated by the new energy wind farm 51 is converted into low frequency power by the first AC/AC frequency conversion device 3 and is collected by the low frequency bus collection port 52.
  • the second sea-island platform 6 is connected to the first sea-island platform 5 through the low-frequency bus collection port 52, and is configured to obtain the low-frequency electric energy output by the low-frequency bus collection port 52.
  • the second island platform 6 may be an island or another island platform on another island. The second island platform 6 obtains electric power through the first island platform 5 and performs low-frequency networking with the first island platform 5.
  • the third sea-island platform 7 is connected to the first sea-island platform 5 through the low-frequency bus collection port 52, and is configured to obtain the low-frequency electric energy collected and output by the low-frequency bus collection port 52.
  • the third island platform 7 may be an island or another island platform on another island.
  • the third island platform 7 also obtains electric energy through the first island platform 5, and can perform low-frequency networking with the first island platform 5.
  • the first AC power grid 1 is connected to the first island platform 5 through a power transmission cable, and is configured to output power frequency electric energy to the first island platform 5.
  • the first AC power grid 1 may be a substation on land.
  • the first AC power grid 1 provides power frequency power to the first island platform 5 on the island.
  • the first AC power grid 1 is a 35kV substation, which is set up to provide power frequency power to the first island platform 5 through a power transmission cable.
  • the second AC power grid 2 is connected to the first island platform 5 through a second AC/AC frequency conversion device 10 and a power transmission cable.
  • the second AC power grid 2 is set to output low-frequency power to the first island platform 5; or, through a bypass switch
  • the device 4, the power transmission cable, and the island control switch 53 are connected to the first island platform 5, and are configured to output power frequency electric energy to the first island platform 5.
  • the second AC power grid 2 can be another substation on land, and the second AC power grid 2 provides low-frequency power to the first island platform 5 on the island.
  • the second AC/AC frequency conversion device 10 fails or is inconvenient to use, the second AC power grid 2 can bypass the second AC/AC frequency conversion device 10 through the bypass switch 4. At this time, the second AC power grid 2 is still in use.
  • the first island platform 5 can be provided with power frequency electrical energy.
  • the three-phase voltages of the second AC power grid 2 mentioned above are respectively represented as A-phase voltage V A , B-phase voltage V B and C-phase voltage V C , and the phase difference of the above three-phase voltage is 120 degrees.
  • the converted three-phase voltages are respectively represented as the first voltage V MA , the second voltage V MB and the third voltage V MC , and the phase difference of the above-mentioned three-phase voltage is 120 degrees.
  • the second AC power grid 2 is usually built on land, and outputs the electric energy to the first island platform 5 by collecting the electric energy generated by the corresponding substations.
  • the sea-island power transmission system in the embodiment of the present invention can not only transmit different types of electric energy to the first sea-island platform 5, but also can fail when the second AC/AC frequency conversion device 3 fails or when the second AC/AC frequency conversion device 3 requires equipment During maintenance, the normal power transmission to the first island platform 5 will not be affected.
  • the new energy wind farm 51 of the first island platform 5 and the low-frequency electrical energy and/or industrial frequency electrical energy obtained through the first AC power grid 1 and the second AC power grid 2 to provide electrical power to the electrical equipment in the island area can also be performed between the first island platform 5, the second island platform 6, and the third island platform 7, thereby achieving large-capacity long-distance power transmission efficiency and enriching the diversity of power transmission.
  • the island power transmission system in the embodiment of the present invention, in Figure 3, further includes: a third AC/AC frequency conversion device 11 and a fourth AC/AC frequency conversion device 12, the third AC/AC frequency conversion device 11 can converge the low-frequency bus at the port
  • the low-frequency frequency corresponding to the low-frequency power output from 52 is converted into the power-frequency frequency corresponding to the power-frequency power, and finally the power-frequency frequency is used to provide power to the second island platform 6.
  • the power-frequency frequency is usually 50Hz.
  • the low-frequency frequency after low-frequency transmission can be selected to use the low-frequency transmission frequency of 50/3Hz. This setting can increase the transmission capacity by 3 times.
  • the fourth AC/AC frequency conversion device 12 can also convert the low frequency frequency corresponding to the low frequency power output from the low frequency bus collection port 52 into the power frequency frequency corresponding to the power frequency power, and then finally pass the power frequency frequency to the third island platform. 7Provide electrical energy.
  • the sea-island power transmission system in the embodiment of the present invention, in FIG. 3, further includes: a first transformer 8 and a second transformer 9.
  • the first transformer 8 its primary side is connected to the low-frequency bus collection port 52, its secondary side is connected to the second island platform 6 through the third AC/AC frequency conversion device 11, and its secondary side is also connected through the fourth AC/AC frequency conversion device 12 is connected to the third island platform 7.
  • the first transformer 8 can be regarded as adjusting the output voltage of the low-frequency bus collection port 52, or can be regarded as adjusting the input voltage of the second sea-island platform 6 and the third sea-island platform 7.
  • the second transformer 9 is connected to the new energy wind farm 51 on the primary side, and connected to the first AC/AC frequency conversion device 3 on the secondary side.
  • the second transformer 9 can adjust the output voltage of the new energy wind farm 51.
  • the first AC/AC frequency conversion device 3, the second AC/AC frequency conversion device 10, the third AC/AC frequency conversion device 11, and the fourth AC/AC frequency conversion device 12 all include: AC/ AC inverter and switch group.
  • the AC/AC frequency converter includes: at least one set of frequency conversion modules, and the frequency conversion module includes: three frequency conversion units.
  • the switch group is a circuit breaker and an isolating switch arranged at both ends of the circuit breaker.
  • the second AC/AC frequency conversion device 10 includes: an AC/AC frequency converter 101 and a switch group 102.
  • the input end of the AC/AC inverter 101 is connected to the second AC power grid 2.
  • the output terminal of the AC/AC inverter 101 in the embodiment of the present invention is connected to the low-frequency bus collection port 52 provided on the first island platform 5 through the switch group 102, and the switch group 102 is provided in the AC/AC inverter. Between the output end of 101 and the first island platform 5, this arrangement facilitates low-frequency power transmission between the second AC power grid 2 and the first island platform 5.
  • the AC/AC frequency converter 101 includes at least one group of frequency conversion modules, and each group of frequency conversion modules includes three frequency conversion units.
  • the input end of the frequency conversion unit is connected to the second AC power grid through a transmission cable. 2 is connected, the output end of the frequency conversion unit is connected to the switch group 102, and the switch group 102 is connected to the first island platform 5.
  • the AC/AC inverter 101 includes a group of inverter modules, the group of inverter modules includes three inverter units 1011, the inverter unit 1011 includes three inverter bridge arms, each inverter bridge arm Both include an inductor 10111 and an H bridge 10112, the first end of the inductor 10111 is connected to the first end of the H bridge 10112, the second end of the inductor 10111 is used as the input end of the variable frequency bridge arm, and the second end of the H bridge 10112 is used as the variable frequency bridge arm The output terminal.
  • the input ends of the three frequency conversion bridge arms are respectively connected to the A phase, B phase and C phase of the first AC power grid 1, and the output ends of the three frequency conversion bridge arms are connected to a switch group 102.
  • the AC/AC frequency converter 101 contains 9 bridge arms composed of cascaded H-bridge 10112 modules, which lead to three-phase low-frequency AC from the neutral point.
  • the H bridge 10112 includes at least one fully controlled H bridge.
  • the H bridge 10112 includes a fully controlled H bridge, and the fully controlled H bridge includes two sets of power electronic device arms and DC capacitors.
  • Two groups of power electronic device bridge arms are connected in parallel, each group of power electronic device bridge arms includes: two power electronic devices connected in series, and a DC capacitor is connected in parallel with the power electronic device bridge arms.
  • the power electronic device includes an insulated gate bipolar transistor (IGBT) and an anti-parallel diode connected in parallel with the IGBT.
  • the power electronic device may also be a metal-oxide-semiconductor field effect transistor (MOS) or a bipolar junction transistor (BJT).
  • MOS metal-oxide-semiconductor field effect transistor
  • BJT bipolar junction transistor
  • the embodiment of the present invention provides a method for controlling low-frequency power transmission on an island, as shown in FIG. 5, including:
  • Step S1 When the bypass switch device and the island control switch are closed and the new energy wind farm disconnects the transmission line, the first AC power grid and the second AC power grid output power frequency electric energy to the first island platform.
  • the bypass switch device and the island control switch on the first island platform are closed, and the new energy wind farm on the first island platform disconnects the transmission line, it can pass through the first AC grid on land and the second Second, the AC power grid simultaneously transmits power frequency power, and the bypass switch device is closed to bypass the first AC/AC frequency conversion device, in order to facilitate the equipment maintenance of the first AC/AC frequency conversion device.
  • Step S2 When the bypass switch device and the island control switch are disconnected, the first AC power grid outputs power frequency power to the first island platform, and the second AC power grid outputs low frequency power to the first island platform, or through a new energy wind farm ,
  • the first AC/AC frequency conversion device and the low-frequency bus collection port respectively output low-frequency electric energy to the second island platform and the third island platform.
  • the first AC power grid and the second AC power grid can transmit power at the same time.
  • the first AC power grid can only transmit power frequency power alone, while the second AC power grid can transmit power frequency power as well as low frequency power. When it is turned on, it means that everything is normal for the first AC/AC frequency conversion device.
  • the second AC power grid can output low-frequency power to the first island platform.
  • the use of new energy wind farms, the first AC/AC inverter device and the low-frequency bus collection port can also output low-frequency power to the second island platform and the third island platform, namely the first island platform, the second island platform and the third island platform.
  • the platform conducts low-frequency networking.
  • Step S3 When the bypass switch device, the island control switch, and the new energy wind farm disconnect the transmission line, the first AC power grid alone outputs power frequency power to the first island platform, and the second AC power grid provides power to the second island platform and the second island platform.
  • the three-island platform outputs low-frequency power.
  • the new energy wind farm on the first island platform and the low-frequency electric energy and/or power frequency electric energy obtained through the first AC grid and the second AC grid are used to provide electric power to the electrical equipment in the island area, while the first island Low-frequency networking can also be carried out between the platform and the second island platform and the third island platform, thereby achieving large-capacity long-distance power transmission efficiency and enriching the diversity of power transmission.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

本文公开了一种海岛输电***及其控制方法。该海岛输电***包括：第一海岛平台，包括：新能源风电场、海岛控制开关、低频母线汇集端口和第一交流电AC/AC变频装置；第二海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接；第三海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接；第一交流电网，通过输电线缆与所述第一海岛平台连接；第一交流电网，通过输电线缆与所述第一海岛平台连接，或，通过旁路开关器件、所述输电线缆、所述海岛控制开关与所述第一海岛平台连接。

Description

海岛输电***及其控制方法
本申请要求在2019年12月10日提交中国专利局、申请号为201911259048.3的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本公开涉及电力输电技术领域，例如涉及一种海岛输电***及其控制方法。
背景技术
随着国民经济的发展，对电能的需求不断加大，对电网的电能输送能力的要求也越来越高。越来越多的岛屿资源被开发，旅游行业发展迅速，岛上用电负荷不断加大，岛屿供电及岛间联网的需求也随之增加，海缆将不再满足输电要求。而新建海缆的难度大、造价高，柔直联网成本高且灵活性差，亟需通过低频输电技术，有效提高海缆载流量。
为了有效解决能源枯竭和环境污染问题，发展新能源已成为应对能源安全、环境污染、气候变化三大挑战，实现人类社会可持续发展的必由之路。风力发电是新能源发电技术中最成熟、最具规模化开发条件的发电方式之一。有些地区风电资源分布和负荷中心呈逆向分布，需要通过大容量远距离输电来实现资源的优化配置，因此，低频输电技术可作为低频输电的优选方式。
低频输电(Low Frequency Alternating Current Transmission，LFAC)是一种新型的输电方式，通过降低***工作频率f，一方面线路感抗X L随频率下降而减小，使得输电线路阻抗大大降低，等效缩短线路的电气距离；另一方面线路容抗X C随频率下降而增大，可减少电缆线路充电无功功率，大大提升线路的输送容量，是未来具有发展前景的海岛联网和海上风电并网输电方式之一。
相关技术中的海岛输电***，通常通过一侧的单个变电站或配电站利用低频输电电缆向另一侧海岛上的供电设备输电，该海岛输电***仅仅是岸上的变电站或配电站与海岛之间建立低频输电传输关系。由于岸上变电站或配电站作为输电端，海岛作为待供电端，仅仅可以实现单一的输电端向待供电端输电，使得该海岛输电方式较为单一、可靠性低、输电容量不足，无法满足海岛联网的供电需求。
发明内容
本公开提供了一种海岛输电***及其控制方法，以解决相关技术中的海岛 输电***的输电方式较为单一、可靠性低、输电容量不足，无法满足海岛联网的供电需求的问题。
提供了一种第一海岛平台，包括：新能源风电场、海岛控制开关、低频母线汇集端口和第一AC/AC变频装置，所述第一海岛平台设置为以下之一：
通过闭合所述海岛控制开关以及以下至少之一给海岛区域的用电设备提供电能：获取的工频电能、获取的低频电能、所述新能源风电场；
通过所述低频母线汇集端口输出低频电能；
通过所述新能源风电场、所述第一AC/AC变频装置和所述低频母线汇集端口输出低频电能；
第二海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接，设置为获取所述低频母线汇集端口汇集输出的所述低频电能；
第三海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接，设置为获取所述低频母线汇集端口汇集输出的低频电能；
第一交流电网，通过输电线缆与所述第一海岛平台连接，设置为向所述第一海岛平台输出工频电能；
第二交流电网，通过第二AC/AC变频装置、输电线缆与所述第一海岛平台连接，设置为向所述第一海岛平台输出低频电能；或，通过旁路开关器件、所述输电线缆、所述海岛控制开关与所述第一海岛平台连接，设置为向所述第一海岛平台输出工频电能。
还提供一种海岛输电的控制方法，用于上述的海岛输电***，包括：
在所述海岛输电***的旁路开关器件和海岛控制开关闭合且所述海岛输电***的新能源风电场断开输电线路的情况下，所述海岛输电***的第一交流电网和第二交流电网向所述海岛输电***的第一海岛平台输出工频电能；
在所述旁路开关器件和所述海岛控制开关断开的情况下，所述第一交流电网向所述第一海岛平台输出所述工频电能，所述第二交流电网向所述第一海岛平台输出低频电能，或，通过所述新能源风电场、所述海岛输电***的第一AC/AC变频装置和低频母线汇集端口分别向所述海岛输电***的第二海岛平台和第三海岛平台输出低频电能；
在所述旁路开关器件、所述海岛控制开关和所述新能源风电场断开输电线路的情况下，所述第一交流电网单独向所述第一海岛平台输出工频电能，且所述第二交流电网向所述第二海岛平台和所述第三海岛平台输出低频电能。
附图说明
图1为本发明实施例提供的一种海岛输电***的结构示意图；
图2为本发明实施例提供的一种第二交流电网接入海岛输电***的结构示意图；
图3为本发明实施例提供的另一种海岛输电***的结构示意图；
图4为本发明实施例提供的一种第二交流电网接入海岛输电***的电路原理图；
图5为本发明实施例提供的一种海岛低频输电的控制方法的流程图。
附图标记：
1-第一交流电网；2-第二交流电网；3-第一AC/AC变频装置；4-旁路开关器件；5-第一海岛平台；6-第二海岛平台；7-第三海岛平台；8-第一变压器；9-第二变压器；10-第二AC/AC变频装置；11-第三AC/AC变频装置；12-第四AC/AC变频装置；51-新能源风电场；52-低频母线汇集端口；53-海岛控制开关；101-AC/AC变频器；102-开关组；1011-变频单元；10111-电感；10112-H桥。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述。
实施例1
本发明实施例提供一种海岛输电***，如图1所示，包括：第一海岛平台5、第二海岛平台6、第三海岛平台7、第一交流电网1和第二交流电网2。
第一海岛平台5，包括：新能源风电场51、海岛控制开关53、低频母线汇集端口52和第一AC/AC变频装置3。此处的第一海岛平台5既可以作为供电平台，又可以作为用电平台，该第一海岛平台5设置在每个海岛或岛屿上，设置为生产作业或其他活动用。例如：可以利用第一海岛平台5在海岛上通过石油钻井开采石油，还可以利用第一海岛平台5在海岛上开采煤炭资源。第一海岛平台5进行生产作业，就需要给生产作业的用电设备提供电能。由于海上的多个海岛的分布通常较为分散，且多个海岛之间也存在一定的距离，为了多个海岛上的多个平台相互之间能够实现远距离输电，可对海岛上的第一海岛平台5供电进行低频输电改造，进而可以增大输送容量，加大输送距离，节省改造成本，降低施工难度。
通过第一海岛平台5可以与岛屿上的其它平台进行海岛联网，因此，第一 海岛平台5可以作为多个岛屿上的中间枢纽平台。在第一海岛平台5上设置有新能源风电场51、海岛控制开关53、低频母线汇集端口52以及第一AC/AC变频装置3。其中，新能源风电场51可以为海上设置的多个风力发电站。由于新能源风电场51属于可再生能源，取之不尽，用之不竭，综合利用风能，可以减少对其它能源的消耗，在很大程度上，可以节约其它能源。并且风能属于清洁能源，对环境污染较小，有利于确保居民健康生活。所以，利用新能源风电场51进行汇集发电，可以节约能源，并且有利于环保建设。海岛控制开关53设置为控制第一海岛平台5的输电线路，低频母线汇集端口52设置为汇集输电线路的低频电能。
在一实施例中，第一海岛平台5设置为通过闭合海岛控制开关53以及获取的工频电能和/或低频电能和/或通过新能源风电场51给海岛区域的用电设备提供电能。第一海岛平台5可以从陆地上的交流电网获取工频电能，还可以从陆地上的交流电网获取低频电能，第一海岛平台5利用所获取的工频电能和/或低频电能可以给海岛区域的用电设备提供电能。当第一海岛平台5使用低频电能给海岛区域的用电设备提供电能时，可以通过第一AC/AC变频装置3进行变频转为工频电能再供电。第一海岛平台5还可以通过新能源风电场51产生电能给海岛区域的用电设备提供电能。
在一实施例中，第一海岛平台5还可以通过低频母线汇集端口52输出低频电能，该低频电能可以从陆地上的交流电网通过低频输电线缆获取，然后，该低频电能被第一海岛平台5上的低频母线汇集端口52汇集。第一海岛平台5还可以通过新能源风电场51、第一AC/AC变频装置3和低频母线汇集端口52输出低频电能。新能源风电场51产生工频电经过第一AC/AC变频装置3变频转为低频电被低频母线汇集端口52汇集。
第二海岛平台6，通过低频母线汇集端口52与第一海岛平台5连接，设置为获取低频母线汇集端口52汇集输出的低频电能。该第二海岛平台6可以为海岛或其它岛屿上的另一海岛平台，第二海岛平台6通过第一海岛平台5获取电能，与第一海岛平台5进行低频组网。
第三海岛平台7，通过低频母线汇集端口52与第一海岛平台5连接，设置为获取低频母线汇集端口52汇集输出的低频电能。该第三海岛平台7可以为海岛或其它岛屿上的另一海岛平台，第三海岛平台7也通过第一海岛平台5获取电能，可以与第一海岛平台5进行低频组网。
第一交流电网1，通过输电线缆与第一海岛平台5连接，设置为向第一海岛平台5输出工频电能。该第一交流电网1可以为陆地上的变电站。第一交流电网1给岛屿上的第一海岛平台5提供工频电能。在图1中，第一交流电网1为 35kV的变电站，其设置为通过输电线缆给第一海岛平台5提供工频电能。
第二交流电网2，通过第二AC/AC变频装置10、输电线缆与第一海岛平台5连接，第二交流电网2设置为向第一海岛平台5输出低频电能；或，通过旁路开关器件4、输电线缆、海岛控制开关53与第一海岛平台5连接，设置为向第一海岛平台5输出工频电能。该第二交流电网2可以为陆地上的另一变电站，第二交流电网2给岛屿上的第一海岛平台5提供低频电能。该第二交流电网2在第二AC/AC变频装置10发生故障或不便使用时，可以通过旁路开关器件4将第二AC/AC变频装置10旁路，此时，第二交流电网2还可以给第一海岛平台5提供工频电能。
如图2所示，上述中第二交流电网2的三相电压分别表示为A相电压V A、B相电压V B和C相电压V C，上述三相电压的相位差为120度。转换后的三相电压分别表示为第一电压V MA、第二电压V MB和第三电压V MC，上述三相电压的相位差为120度。在本实施例中，第二交流电网2通常建设在陆地上，通过汇集其分别对应的变电站产生的电能，向第一海岛平台5输出电能。
本发明实施例中的海岛输电***，不但可以给第一海岛平台5输送不同类型的电能，还可以在第二AC/AC变频装置3发生故障或当第二AC/AC变频装置3需要进行设备检修时，不影响对第一海岛平台5的正常输电。另外，利用第一海岛平台5的新能源风电场51、以及通过第一交流电网1和第二交流电网2所获取的低频电能和/或工频电能给该海岛区域的用电设备提供电能，同时第一海岛平台5与第二海岛平台6、第三海岛平台7之间还可以进行低频组网，进而实现大容量远距离的输电效率，丰富了输电的多样性。
本发明实施例中的海岛输电***，在图3中，还包括：第三AC/AC变频装置11和第四AC/AC变频装置12，第三AC/AC变频装置11可以将低频母线汇集端口52输出的低频电能对应的低频频率通过转换为工频电能对应的工频频率，进而最终通过工频频率为第二海岛平台6提供电能，工频频率通常为50Hz，随着输电频率增加，线缆电流增加，绝缘性能随之下降，在综合考虑其绝缘和成本等多种因素的影响后可选择低频传输后的低频频率采用50/3Hz的低频输电频率，这样设置可以增加3倍传输容量，降低线路阻抗、增加传输距离。同理，第四AC/AC变频装置12也可以将低频母线汇集端口52输出的低频电能对应的低频频率通过转换为工频电能对应的工频频率，进而最终通过工频频率为第三海岛平台7提供电能。
本发明实施例中海岛输电***，在图3中，还包括：第一变压器8和第二变压器9。
第一变压器8，其一次侧与低频母线汇集端口52连接，其二次侧通过第三 AC/AC变频装置11与第二海岛平台6连接，其二次侧还通过第四AC/AC变频装置12与第三海岛平台7连接。第一变压器8可认为是调节低频母线汇集端口52的输出电压，或，可认为是调节第二海岛平台6和第三海岛平台7的输入电压。
第二变压器9，其一次侧与新能源风电场51连接，其二次侧与第一AC/AC变频装置3连接。第二变压器9可以调节新能源风电场51的输出电压。
本发明实施例中的海岛输电***，第一AC/AC变频装置3、第二AC/AC变频装置10、第三AC/AC变频装置11、第四AC/AC变频装置12均包括：AC/AC变频器和开关组。其中，AC/AC变频器包括：至少一组变频模块，变频模块包括：三个变频单元。其中，开关组为断路器以及设置于断路器两端的隔离开关。
在本实施例中，在图2中，第二AC/AC变频装置10包括：AC/AC变频器101和开关组102。其中，AC/AC变频器101的输入端与第二交流电网2连接。在图2中，本发明实施例中的AC/AC变频器101的输出端通过开关组102与第一海岛平台5上设置的低频母线汇集端口52连接，开关组102设置于AC/AC变频器101的输出端和第一海岛平台5之间，这样设置便于第二交流电网2与第一海岛平台5之间进行低频输电。
AC/AC变频器101包括至少一组变频模块，每组变频模块包括三个变频单元，对于第一AC/AC变频装置3而言，其变频单元的输入端通过输电线缆与第二交流电网2连接，变频单元的输出端与开关组102连接，开关组102与第一海岛平台5连接。在本实施例中，如图4所示，AC/AC变频器101包括一组变频模块，该组变频模块包括三个变频单元1011，变频单元1011包括三个变频桥臂，每个变频桥臂均包括电感10111和H桥10112，电感10111的第一端与H桥10112的第一端连接，电感10111的第二端作为变频桥臂的输入端，H桥10112的第二端作为变频桥臂的输出端。三个变频桥臂的输入端分别与第一交流电网1的A相、B相和C相连接，三个变频桥臂的输出端与一开关组102连接。AC/AC变频器101含有9个由级联H桥10112模块组成的桥臂，从中性点引出三相低频交流。
H桥10112包括至少一个全控型H桥，在本实施例中，在图4中，H桥10112包括一个全控型H桥，全控型H桥包括两组电力电子器件桥臂和直流电容，两组电力电子器件桥臂并联连接，每组电力电子器件桥臂均包括：串联的两个电力电子器件，直流电容与电力电子器件桥臂并联连接。电力电子器件包括绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)和与IGBT并联连接的反并联二极管。在其它实施例中，电力电子器件还可以为金属(metal)-氧化物(oxide)-半导体(semiconductor)场效应晶体管(Metal-Oxide-Semiconductor， MOS)或者双极型晶体管(Bipolar Junction Transistor，BJT)等，根据需要合理设置即可。由于一个全控型H桥所能承受的电压等级有限，而第一海岛平台的电压较高，故需要多个全控型H桥进行级联，在其它实施方式中，可根据需要合理设置全控型H桥的级联个数。
实施例2
本发明实施例提供一种海岛低频输电的控制方法，如图5所示，包括：
步骤S1：当旁路开关器件和海岛控制开关闭合且新能源风电场断开输电线路时，第一交流电网和第二交流电网向第一海岛平台输出工频电能。在图1中，当旁路开关器件和第一海岛平台上的海岛控制开关闭合时，且第一海岛平台上的新能源风电场断开输电线路，可以通过陆地上的第一交流电网和第二交流电网同时输送工频电能，旁路开关器件闭合，将第一AC/AC变频装置旁路掉，为了便于第一AC/AC变频装置进行设备检修。
步骤S2：当旁路开关器件和海岛控制开关断开时，第一交流电网向第一海岛平台输出工频电能，第二交流电网向第一海岛平台输出低频电能，或，通过新能源风电场、第一AC/AC变频装置和低频母线汇集端口分别向第二海岛平台和第三海岛平台输出低频电能。第一交流电网和第二交流电网可以同时输送电能，第一交流电网只能单独输送工频电能，而第二交流电网既可以输送工频电能，还可以输送低频电能，当旁路开关器件断开时，说明第一AC/AC变频装置一切正常，利用第一AC/AC变频装置进行变频，第二交流电网可以向第一海岛平台输出低频电能。同时，利用新能源风电场、第一AC/AC变频装置和低频母线汇集端口还可以向第二海岛平台和第三海岛平台输出低频电能，即第一海岛平台、第二海岛平台和第三海岛平台进行低频组网。
步骤S3：当旁路开关器件、海岛控制开关和新能源风电场断开输电线路时，第一交流电网单独向第一海岛平台输出工频电能，且第二交流电网向第二海岛平台和第三海岛平台输出低频电能。
本发明实施例中的海岛低频输电的控制方法，通过切换旁路开关器件、海岛控制开关，不但可以给第一海岛平台输送不同类型的电能，还可以在第二AC/AC变频装置发生故障或当第二AC/AC变频装置需要进行设备检修时，不影响对第一海岛平台的正常输电。另外，利用第一海岛平台的新能源风电场、以及通过第一交流电网和第二交流电网所获取的低频电能和/或工频电能给该海岛区域的用电设备提供电能，同时第一海岛平台与第二海岛平台、第三海岛平台之间还可以进行低频组网，进而实现大容量远距离的输电效率，丰富了输电的多样性。

Claims (10)

  1. 一种海岛输电***，包括：
    第一海岛平台，包括：新能源风电场、海岛控制开关、低频母线汇集端口和第一交流电AC/AC变频装置，所述第一海岛平台设置为以下之一：
    通过闭合所述海岛控制开关以及以下至少之一给海岛区域的用电设备提供电能：获取的工频电能、获取的低频电能、所述新能源风电场；
    通过所述低频母线汇集端口输出低频电能；
    通过所述新能源风电场、所述第一AC/AC变频装置和所述低频母线汇集端口输出低频电能；
    第二海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接，设置为获取所述低频母线汇集端口汇集输出的所述低频电能；
    第三海岛平台，通过所述低频母线汇集端口与所述第一海岛平台连接，设置为获取所述低频母线汇集端口汇集输出的低频电能；
    第一交流电网，通过输电线缆与所述第一海岛平台连接，设置为向所述第一海岛平台输出工频电能；
    第二交流电网，通过第二AC/AC变频装置、输电线缆与所述第一海岛平台连接，设置为向所述第一海岛平台输出低频电能；或，通过旁路开关器件、所述输电线缆、所述海岛控制开关与所述第一海岛平台连接，设置为向所述第一海岛平台输出工频电能。
  2. 根据权利要求1所述的海岛输电***，还包括：第三AC/AC变频装置和第四AC/AC变频装置；
    所述第二海岛平台通过所述第三AC/AC变频装置与所述低频母线汇集端口连接，所述第三海岛平台通过所述第四AC/AC变频装置与所述低频母线汇集端口连接。
  3. 根据权利要求2所述的海岛输电***，还包括：
    第一变压器，所述第一变压器的一次侧与所述低频母线汇集端口连接，所述第一变压器的二次侧通过所述第三AC/AC变频装置与所述第二海岛平台连接，所述第一变压器的二次侧还通过所述第四AC/AC变频装置与所述第三海岛平台连接；
    第二变压器，所述第二变压器的一次侧与所述新能源风电场连接，所述第二变压器的二次侧与所述第一AC/AC变频装置连接。
  4. 根据权利要求2所述的海岛输电***，其中，所述第一AC/AC变频装置、 所述第二AC/AC变频装置、所述第三AC/AC变频装置、所述第四AC/AC变频装置均包括：AC/AC变频器和开关组，其中，所述AC/AC变频器包括：至少一组变频模块，每组变频模块包括：三个变频单元。
  5. 根据权利要求4所述的海岛输电***，其中，所述开关组为断路器以及设置于所述断路器两端的隔离开关。
  6. 根据权利要求4所述的海岛输电***，其中，所述变频单元包括：三个变频桥臂，每一个变频桥臂包括：电感和H桥，所述电感的第一端与所述H桥的第一端连接，所述电感的第二端作为所述变频桥臂的输入端，所述H桥的第二端作为所述变频桥臂的输出端。
  7. 根据权利要求6所述的海岛输电***，其中，所述H桥包括：至少一个全控型H桥，所述全控型H桥包括：两组电力电子器件桥臂和直流电容，所述两组电力电子器件桥臂并联连接，每组电力电子器件桥臂包括：串联的两个电力电子器件，所述直流电容与所述两组电力电子器件桥臂并联连接。
  8. 根据权利要求7所述的海岛输电***，其中，所述电力电子器件包括：绝缘栅双极型晶体管和与所述绝缘栅双极型晶体管并联连接的反并联二极管。
  9. 根据权利要求1-8所述的海岛输电***，其中，所述第一交流电网、所述第二交流电网均包括：变电站。
  10. 一种海岛输电的控制方法，用于权利要求1-9任一项所述的海岛输电***，包括：
    在所述海岛输电***的旁路开关器件和海岛控制开关闭合且所述海岛输电***的新能源风电场断开输电线路的情况下，所述海岛输电***的第一交流电网和第二交流电网向所述海岛输电***的第一海岛平台输出工频电能；
    在所述旁路开关器件和所述海岛控制开关断开的情况下，所述第一交流电网向所述第一海岛平台输出所述工频电能，所述第二交流电网向所述第一海岛平台输出低频电能，或，通过所述新能源风电场、所述海岛输电***的第一AC/AC变频装置和低频母线汇集端口分别向所述海岛输电***的第二海岛平台和第三海岛平台输出低频电能；
    在所述旁路开关器件、所述海岛控制开关和所述新能源风电场断开输电线路的情况下，所述第一交流电网单独向所述第一海岛平台输出工频电能，且所述第二交流电网向所述第二海岛平台和所述第三海岛平台输出低频电能。
PCT/CN2020/128716 2019-12-10 2020-11-13 海岛输电***及其控制方法 WO2021115019A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20900145.2A EP4075625A4 (en) 2019-12-10 2020-11-13 ISLAND POWER SYSTEM AND CONTROL METHODS THEREFOR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201911259048.3A CN111030118B (zh) 2019-12-10 2019-12-10 一种海岛输电***及其控制方法
CN201911259048.3 2019-12-10

Publications (1)

Publication Number Publication Date
WO2021115019A1 true WO2021115019A1 (zh) 2021-06-17

Family

ID=70205393

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/128716 WO2021115019A1 (zh) 2019-12-10 2020-11-13 海岛输电***及其控制方法

Country Status (3)

Country Link
EP (1) EP4075625A4 (zh)
CN (1) CN111030118B (zh)
WO (1) WO2021115019A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113595074A (zh) * 2021-08-02 2021-11-02 西安交通大学 一种高压交流电缆的电力传输***及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111030118B (zh) * 2019-12-10 2021-02-09 全球能源互联网研究院有限公司 一种海岛输电***及其控制方法
CN112769131A (zh) * 2020-12-30 2021-05-07 国网河北省电力有限公司沧州供电分公司 海上平台低频输电***及海陆电网***

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030074146A1 (en) * 2001-09-13 2003-04-17 Stoupis James D. Crossover fault classification for power lines with parallel circuits
CN201947047U (zh) * 2010-12-30 2011-08-24 比亚迪股份有限公司 一种电网供电***
CN110112731A (zh) * 2019-05-15 2019-08-09 全球能源互联网研究院有限公司 一种输电***
CN110137950A (zh) * 2019-05-15 2019-08-16 全球能源互联网研究院有限公司 一种输电***
CN110148963A (zh) * 2019-05-15 2019-08-20 全球能源互联网研究院有限公司 一种基于储能的多换流链交交变频器
CN111030118A (zh) * 2019-12-10 2020-04-17 全球能源互联网研究院有限公司 一种海岛输电***及其控制方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101867197B (zh) * 2010-07-14 2012-08-22 上海交通大学 海上风电场并网的轻型直流输电实验***

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030074146A1 (en) * 2001-09-13 2003-04-17 Stoupis James D. Crossover fault classification for power lines with parallel circuits
CN201947047U (zh) * 2010-12-30 2011-08-24 比亚迪股份有限公司 一种电网供电***
CN110112731A (zh) * 2019-05-15 2019-08-09 全球能源互联网研究院有限公司 一种输电***
CN110137950A (zh) * 2019-05-15 2019-08-16 全球能源互联网研究院有限公司 一种输电***
CN110148963A (zh) * 2019-05-15 2019-08-20 全球能源互联网研究院有限公司 一种基于储能的多换流链交交变频器
CN111030118A (zh) * 2019-12-10 2020-04-17 全球能源互联网研究院有限公司 一种海岛输电***及其控制方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4075625A4

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113595074A (zh) * 2021-08-02 2021-11-02 西安交通大学 一种高压交流电缆的电力传输***及方法

Also Published As

Publication number Publication date
CN111030118A (zh) 2020-04-17
EP4075625A4 (en) 2024-04-24
EP4075625A1 (en) 2022-10-19
CN111030118B (zh) 2021-02-09

Similar Documents

Publication Publication Date Title
WO2021115019A1 (zh) 海岛输电***及其控制方法
EP3651305A1 (en) Chained multi-port grid-connected interface apparatus and control method
CN105703388B (zh) 一种基于中高压直流接入的光伏并网发电***
CN110970922A (zh) 一种交直流混合分布式可再生能源***
WO2021004479A1 (zh) 变频输电***
CN110112731B (zh) 一种输电***
CN102983584A (zh) 一种用于不平衡***的统一潮流控制器
WO2022213525A1 (zh) 一种交交变换器
CN112152261A (zh) 一种基于电力电子变压器交直流混合组网的配电网***
WO2022001834A1 (zh) 数据中心供配电***
CN105652116B (zh) 一种基于dc/dc变换器的背靠背试验电路
CN113890122A (zh) 面向办公居住园区用的交直流多端口配电***
CN116826694B (zh) 多端口数据中心供电***及供电方法
CN103236693B (zh) 一种统一电能质量控制器
CN107666157B (zh) 一种交直流混联电网
CN202930956U (zh) 一种用于不平衡***的统一潮流控制器
Deng et al. Coordinated control and application of multi-terminal DC distribution system
CN116131325A (zh) 一种用于远距离海上风电场直流汇集外送的固态变压器
CN204103855U (zh) 串联式光伏方阵
CN216215929U (zh) 面向办公居住园区用的交直流多端口配电***
CN210137187U (zh) 一种基于储能的多换流链交交变频器
CN112467777B (zh) 一种利用模块化组合式直流变压器控制不对称直流电流的方法
Fu et al. Application Prospects of Flexible Low-Frequency AC Transmission in Offshore Wind Power Integration
CN210137183U (zh) 一种输电***
CN210404741U (zh) 一种输电***

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20900145

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020900145

Country of ref document: EP

Effective date: 20220711