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Main Circuit and Method for Improving Fault Ride-through Capability of Voltage Source Converter DC Transmission

A technology of voltage source converter and direct current transmission, which is applied in the direction of emergency protection circuit device, circuit device, power transmission AC network, etc. for limiting overcurrent/overvoltage, and can solve the difficulty and cost of high-voltage IGBT series switch technology High-level problems, to achieve the effect of convenient and practical traversal ability, excellent performance, and guarantee system security

Active Publication Date: 2017-02-01
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-voltage IGBT series switch with this structure is technically difficult to realize, and a large number of high-power switching devices are used, and the cost is very high

Method used

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  • Main Circuit and Method for Improving Fault Ride-through Capability of Voltage Source Converter DC Transmission
  • Main Circuit and Method for Improving Fault Ride-through Capability of Voltage Source Converter DC Transmission

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Embodiment

[0024] The structure schematic diagram of the present invention is shown in 2, the main circuit of the present invention to improve the fault ride-through capability of DC power transmission of the voltage source converter, the main circuit of the present invention to improve the fault ride-through capability of the DC power transmission of the voltage source converter, and the AC receiving end power grid A receiving-end converter station and a sending-end converter station are arranged between the wind farm and the receiving-end converter station, and the DC side of the receiving-end converter station is connected to an energy absorbing device.

[0025] The DC side connection of the receiving end converter station includes an energy absorbing device with a spark gap, a gap spark discharge device, and a metal oxide voltage limiter, or the DC side connection of the receiving end converter station includes an energy absorbing device with a spark gap, Either the receiving-end conv...

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Abstract

The invention discloses a main circuit and method for improving a voltage-source transverter DC power-transmission fault ride-through capability. A receiving-end convertor station and a sending-end convertor station are arranged between an AC receiving-end power grid and a wind power plant. A DC side of the receiving-end convertor station is connected with an energy-absorption device. A DC energy-absorption circuit at the DC wire inlet side of the receiving-end convertor station is configured into a type of spark gaps and metal-oxide voltage limiters. When a fault occurs to the AC side of the receiving-end power grid, the energy-absorption circuit triggers the spark gaps to act and then the gaps are switched on and DC voltages are applied to the two ends of the metal-oxide voltage limiters and the DC voltages are larger than the rated DC voltage of the metal-oxide voltage limiters. After the metal-oxide voltage limiters act, voltages are applied to the two ends of gap spark discharging devices and the metal-oxide voltage limiters and at the same time, the gap spark discharging devices control discharging current to be within a reasonable range. The new main-circuit structure adopts mature device elements such as the metal-oxide voltage limiters, the GAPs and the gap spark discharging devices and the like and operation reliability is high and cost of the DC energy-absorption circuit is reduced.

Description

technical field [0001] The invention relates to a main loop and a method for improving the DC transmission fault ride-through capability of a voltage source converter, and belongs to the innovative technology of the primary loop and the method for improving the DC transmission fault ride-through capability of the voltage source converter. Background technique [0002] In order to achieve sustainable development, using renewable energy such as solar energy and wind energy to generate electricity has become the development direction of the future power system. These power generation methods have the characteristics of being far away from the main grid and fluctuating greatly over time. The voltage source converter HVDC (VSC-HVDC) based on the voltage source converter can independently and quickly control the transmitted active power and reactive power. Active power and reactive power, with superior controllability and flexibility, have become the most potential power transmis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02H9/06H02H9/04
CPCY02E60/60
Inventor 饶宏许树楷黎小林冯满盈李立浧候婷朱喆陈俊魏伟陈名
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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