High-voltage DC line pilot protection method based on fault DC component

A DC component, high-voltage DC technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problem of not fully considering the impact of distributed capacitance current on the protection method, and achieve easy hardware implementation, low sampling rate requirements, and accurate identification. Effect

Active Publication Date: 2016-01-20
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology does not fully consider the influence of distributed capacitive current on the protection method

Method used

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  • High-voltage DC line pilot protection method based on fault DC component
  • High-voltage DC line pilot protection method based on fault DC component
  • High-voltage DC line pilot protection method based on fault DC component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, this embodiment includes the following steps:

[0025] Step 1. Synchronously collect the real-time voltage and real-time current at both ends of the high-voltage direct current line.

[0026] Step 2. Calculate the sudden changes in voltage and current on both sides of the line in real time.

[0027] The voltage mutation amount is the difference between the real-time voltage and the steady-state voltage when the high-voltage direct current line is in normal operation.

[0028] The current sudden change is the difference between the real-time current and the steady-state current when the high-voltage direct current line is in normal operation.

[0029] Step 3, using a filter to extract the DC component of the sudden change in voltage and the direct current component of the sudden change in current.

[0030] The filter is a Chebyshev filter.

[0031] Step 4. Calculate the transient power P of the faulty DC component at the protection installa...

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PUM

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Abstract

The invention discloses a high-voltage DC line pilot protection method based on a fault DC component. The method comprises the steps: carrying out the real-time synchronous sampling of a voltage and a current through voltage-dividing/current-dividing devices at two ends of a high-voltage DC power transmission line, and obtaining a real-time voltage and a real-time current; respectively calculating a voltage break variable and a current break variable; extracting corresponding DC components through a DC filter; calculating the transient power of a fault DC component at a rectification-side protection installation position; discriminating the transient power; calculating fault DC impedance according to the discrimination results, and discriminating the fault DC impedance, thereby determining a fault type. The method is low in requirements for a sampling rate, is simple and clear in setting, is not affected by distributed capacitance and current, and can recognize various types of faults quickly and sensitively.

Description

technical field [0001] The invention relates to a technology in the field of high-voltage direct current transmission systems, in particular to a method for longitudinal protection of high-voltage direct current lines based on faulty direct current components. Background technique [0002] In recent years, in order to meet the challenges of energy environment and sustainable development, a new round of energy structure transformation is being promoted worldwide. High-voltage direct current (HVDC) has significant technical advantages in large-scale power transmission, long-distance transmission, renewable energy acceptance, efficient new transmission and distribution network construction, and energy Internet construction, and is currently gaining more and more attention. focus on. my country has a vast territory, and the energy center and load center are distributed in reverse, which provides a broad application prospect for HVDC transmission technology. At present, the DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 杨亚宇邰能灵郑晓冬范春菊
Owner SHANGHAI JIAO TONG UNIV
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