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Multi-infeed HVDC (high-voltage direct current) system partitioning method based on mounting of fault current limiters

A technology of fault current limiter and DC drop point, which is applied in the direction of instruments, measuring devices, circuit devices, etc., can solve the problems of ineffective improvement, increase the system, and reduce the reliability of power supply, so as to shorten the duration of commutation failure, The effect of speeding up recovery and improving security and stability

Inactive Publication Date: 2012-10-31
ZHEJIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Although the method introduced in the above literature can improve the transient stability of the multi-DC drop point system to a certain extent, it also has the disadvantages of increasing the complexity of the system operation and reducing the reliability of power supply, and in some cases its improvement The effect is not obvious

Method used

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  • Multi-infeed HVDC (high-voltage direct current) system partitioning method based on mounting of fault current limiters
  • Multi-infeed HVDC (high-voltage direct current) system partitioning method based on mounting of fault current limiters
  • Multi-infeed HVDC (high-voltage direct current) system partitioning method based on mounting of fault current limiters

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Embodiment Construction

[0042] In order to describe the present invention more specifically, the method for partitioning the multi-drain drop point system of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] The multi-flow drop point system studied in this embodiment is as follows: figure 2 As shown, the sending-end power grid and the receiving-end power grid constitute a power system; among them, power stations G1~G3, substations B1~B3, and rectifier stations Z1~Z3 form the sending-end power grid, power stations G4~G6, inverter stations N1~N3 , substations B4~B9 and loads L1~L3 form the receiving end power grid. There are three DC lines and three AC lines (Z1-N1, Z2-N2, Z3-N3) between the sending grid and the receiving grid, and the three DC landing points corresponding to the three DC lines are respectively Inverter stations N1-N3. Since the drop point of the three-circuit DC line is in the same receiving-end ...

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Abstract

The invention discloses a multi-infeed HVDC (high-voltage direct current) system partitioning method based on the mounting of fault current limiters. The fault current limiters are mounted on proper alternating current lines, so that a multi-infeed HVDC system is partitioned into a plurality of regional power grids which are isolated from one another by the fault current limiters; when the alternating current system in a certain regional power grid in the multi-infeed HVDC system is subjected to a short circuit fault, the impedance of the fault current limiter is increased to a rated value, so that an electrical distance among the regional power grids can be increased, and the short circuit fault can be prevented from being transmitted to other regional power grids from the faulted regional power grid; and the alternating current bus voltage in other regional power grids is increased, the phase change failure duration of each HVDC line in each of other regional power grids can be shortened, and the recovery speed of the transmission power of the direct current lines can be increased, so that the problems of power imbalance and flow transferring of the alternating current system caused by the simultaneous phase change failure of the HVDC lines in the multi-infeed HVDC system can be relieved, and the safety and stability of the multi-infeed HVDC system under the condition of the short circuit fault of the alternating current system are improved.

Description

technical field [0001] The invention belongs to the technical field of power system stability control, and in particular relates to a method for partitioning a multi-DC drop point system based on installing a fault current limiter. Background technique [0002] The power station converts petrochemical energy, water energy, nuclear energy, wind energy and solar energy into electric energy. The electric energy is transmitted and distributed to users through rectifier stations, inverter stations, substations and power lines, where it is passed through load equipment such as motors, electric furnaces and lamps. Convert electrical energy into mechanical energy, heat energy and light energy. Therefore, the unified whole composed of power stations, rectifier stations, inverter stations, substations, power lines and various electrical loads is called a power system. [0003] my country's energy resources and load distribution are extremely unbalanced. Due to its economic and techno...

Claims

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Application Information

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IPC IPC(8): H02J3/00G01R31/02
Inventor 徐政黄弘扬刘昇
Owner ZHEJIANG UNIV
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