A protection configuration and detection method for the DC region of a DC system

A DC system and protection configuration technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as wrong selection of fault areas, protection malfunctions, etc., and achieve the effect of solving malfunctions

Active Publication Date: 2021-05-28
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a protection configuration and detection method for the DC area of ​​the DC system, which can solve the problems of protection misoperation and wrong selection of fault areas in the DC power transmission and distribution system of the symmetrical unipolar topology, thereby ensuring the reliability of the system Stable operation

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  • A protection configuration and detection method for the DC region of a DC system
  • A protection configuration and detection method for the DC region of a DC system
  • A protection configuration and detection method for the DC region of a DC system

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[0015] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0016] The invention provides a protection configuration and detection method for the DC area of ​​a DC system. Firstly, a lightning arrester is arranged inside the symmetrical unipolar DC system, for example, it is set in figure 1 and figure 2 Surge arrester 2 in zone 1, when figure 2 When a negative pole grounding fault occurs in the shown DC area 4, the protection device in the area uses the voltage threshold of the fault pole and the non-fault pole to select the fault pole. When the positive pole voltage |U dp |>k 1 u DN And|U dn |2 u DN , it is considered that the negative pole is the fault pole and the positive pole is the non-fault pole. When |U dp |>k 3 u sa_ref , exit or delay the current differential criterion or longitudinal direction criterion of the DC positive region; where U DN is the voltage...

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Abstract

The invention discloses a protection configuration and detection method for a DC area of ​​a DC system. Firstly, a lightning arrester is arranged inside a symmetrical unipolar DC system. The voltage threshold selects the faulty pole, and at the same time, combined with the voltage of the non-faulty pole, exits or delays the current differential or longitudinal direction criterion of the positive DC positive area. This method can solve the problems of protection misoperation and wrong selection of fault areas in the DC power transmission and distribution system of symmetrical unipolar topology, so as to ensure the reliable and stable operation of the system.

Description

technical field [0001] The invention belongs to the field of direct current transmission and distribution of power systems, and in particular relates to a protection configuration and a detection method for a direct current area of ​​a direct current system. Background technique [0002] The flexible DC transmission and distribution system uses a voltage source converter, which can independently and quickly control the active power and reactive power of the system, thereby improving the stability of the system, suppressing the fluctuation of system frequency and voltage, and improving the steady-state performance of the AC system . [0003] With the development of flexible DC transmission technology, multi-terminal flexible DC transmission, flexible DC power grid, flexible DC distribution network, etc. have also been gradually popularized and applied. In flexible DC transmission / distribution, the topologies used are mainly divided into two types: bipolar and symmetrical uni...

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 王柯卢宇董云龙随顺科姜崇学李钢胡兆庆鲁雷
Owner NR ELECTRIC CO LTD
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