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A longitudinal protection method suitable for AC lines on the inverter side of lcc-hvdc

A technology on the AC line and inverter side, which is applied in the electric power field, can solve the problems of low reliability of protection methods, and achieve the effect of improving protection reliability, high reliability, and improving stability

Active Publication Date: 2019-12-03
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to propose a longitudinal protection method suitable for AC lines on the inverter side of LCC-HVDC to solve the problem of low reliability of existing protection methods

Method used

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  • A longitudinal protection method suitable for AC lines on the inverter side of lcc-hvdc
  • A longitudinal protection method suitable for AC lines on the inverter side of lcc-hvdc
  • A longitudinal protection method suitable for AC lines on the inverter side of lcc-hvdc

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] see figure 1 , which is a flow chart of an embodiment of a longitudinal protection method applicable to LCC-HVDC inverter side AC lines based on the present invention. combine figure 2 The LCC-HVDC network architecture diagram shown, this embodiment adopts the following process to realize the longitudinal protection of the AC line on the inverter side of the LCC-HVDC:

[0046] Step 11: Obtain the sampling signal of the three-phase high-frequency current traveling wave, and determine whether the protection start condition is met.

[0047] Specifically, from figure 2 The sampling signal of the three-phase high-frequency current traveling wave is obtained on the direct current transmission line, and the specific sampling method refers to t...

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Abstract

The invention discloses a pilot protection method suitable for an LCC-HVDC inversion-side AC line, comprising the steps of acquiring a sampling signal of a three-phase high-frequency current travelingwave, and determining whether the sampling signal satisfies a known protection start condition; if so, starting a near-inversion-side protection unit and a far-inversion-side protection unit; and based on a narrow band-pass filter and an empirical mode decomposition algorithm, acquiring the power-frequency current integral values of the two protection units before and after the failure and determining a near-inversion-side state value and a far-inversion-side state value; and determining a fault type according to the near-inversion-side state value and the far-inversion-side state value, andexecuting the corresponding protection according to the fault type. The method of the invention has high reliability and adaptability.

Description

technical field [0001] The invention belongs to the field of electric power technology, in particular, it relates to a protection method for an electric power system, and more specifically, it relates to a longitudinal protection method applicable to an AC line on the inverter side of an LCC-HVDC (current source type high-voltage direct current transmission) . Background technique [0002] With the gradual increase in the scale of the power system, a large number of large-capacity AC-DC hybrid systems with the characteristics of long transmission distance, large transmission capacity, and high transmission efficiency have been constructed. LCC-HVDC, as a current source type high-voltage direct current transmission system, is widely used application. For LCC-HVDC, due to the special structure and control strategy of its inverter station, its normal operation is easily affected by the AC line fault on the inverter side. Generally, there are three different operating states a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 王栋侯梦倩刘喜梅于飞
Owner QINGDAO UNIV OF SCI & TECH
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