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Flexible direct current transmission grounding measurement device and protection method

A flexible DC power transmission, measurement and protection technology, applied to emergency protection circuit devices, fault locations, electrical components, etc., can solve problems such as indirect detection methods and unbalanced DC bus voltage, and achieve the effect of improving operation speed and reliability

Active Publication Date: 2017-04-19
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two current measuring points and two voltage measuring points are respectively set on the positive DC bus and the negative bus, where the voltage measuring points are located as follows figure 1 In UdP and UdN, these two voltage measuring points are used to form the DC bus voltage imbalance to indirectly detect the ground fault. The disadvantage is that the detection method is not direct

Method used

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  • Flexible direct current transmission grounding measurement device and protection method
  • Flexible direct current transmission grounding measurement device and protection method
  • Flexible direct current transmission grounding measurement device and protection method

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Embodiment Construction

[0030] The measurement device and method of the present invention will be described below.

[0031] Embodiment 1 of the present invention is as figure 2 As shown, a measurement protection device in a flexible direct current transmission system, specifically refers to setting a current measurement device and a delay device at the grounding point (3). The current measuring device measures the ground current IGND. If |IGND|>fixed value 1, it indicates that a fault occurs, and the protection will be activated after a delay of 1 through the delay device. The fixed value 1 is 0.2±0.15 times the DC rated current. For example, for a ground fault, the IGND is 112A, the rated current is 1000A, and the fault lasts for 110ms; the fixed value 1 is 100A, and the delay 1 is 80ms. 80ms protection action after fault.

[0032] Embodiment 2 of the present invention such as image 3 As shown, the measurement device includes a voltage measurement device and a delay device at the grounding po...

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Abstract

The invention discloses a protection device and method suitable for flexible DC power transmission grounding measurement. A grounding part at a current converter side is provided with a current measurement device and / or a grounding voltage measurement device and / or a voltage measurement device arranged at a DC bus, and a time-delay device. Grounding current IGND, grounding voltage UGND and / or DC positive electrode voltage UdP and DC negative electrode voltage UdN are measured, and faults are judged according to each measurement value. If the faults occur, protection is started after time delay. Compared with an existing measurement protection technology, speed and reliability of protective motions related to the grounding faults are enhanced.

Description

technical field [0001] The invention relates to protection circuit technology, in particular to a flexible DC transmission grounding measurement device and a protection method. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently adjust the transmission of active and reactive power, improve the transmission capacity of the AC system, and easily form a multi-terminal DC transmission system. And other application fields, have obvious competitiveness. [0003] A flexible DC transmission system usually uses a converter transformer to connect two or more AC systems. For a single converter station, the primary side of the converter transformer is connected to the AC system, and the secondary side of the converter transformer is connected to the converter for conversion into DC, and the electric energy is transmitted to another converter station through the DC line. The grounding form of the primary side of the converter t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 张建锋卢宇田杰
Owner NR ELECTRIC CO LTD
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