Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line

A DC line, high-voltage DC technology, applied in the direction of automatic disconnection of emergency protection devices, circuit devices, emergency protection circuit devices, etc., can solve the problems of complex algorithm, large amount of calculation, etc., to achieve simple calculation, simple algorithm, and speed of action. quick effect

Active Publication Date: 2014-07-02
SHANGHAI JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

However, this existing technology needs to calculate the "average energy sum" of the high frequency, intermediate frequency and low frequency on the protection line, the algorithm is complex and the calculation amount is large

Method used

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  • Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line
  • Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line
  • Characteristic-harmonic-based protection method and system for high-voltage direct current transmission line

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Embodiment

[0026] Such as figure 1 As shown, the present embodiment is realized through a system with the following structure, which includes: a protection measurement unit, a characteristic current harmonic calculation unit, a logic judgment unit, a protection action execution unit and a display unit, wherein: the protection measurement unit is connected to the DC line The DC transformer device is connected to receive the line DC current measured by the DC transformer in real time and transmit the real-time current information to the characteristic current harmonic calculation unit; the real-time DC current information is analyzed in the characteristic current harmonic calculation unit, and the unit calculates According to the above logic judgment expression, the protection makes correct logic judgment and transmits the judgment result to the corresponding protection action execution unit and display unit.

[0027] Such as figure 2 As shown, the present invention realizes the characte...

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Abstract

The invention discloses a characteristic-harmonic-based protection method and a characteristic-harmonic-based protection system for a high-voltage direct current transmission line. The characteristic-harmonic-based protection method for the high-voltage direct current transmission line comprises the following steps of: synchronously sampling direct currents on the two sides of the high-voltage direct current transmission line to obtain real-time current data, and performing discrete Fourier transform to obtain current characteristic harmonics at the two ends of the line; and counting the number Nn.m of characteristic current harmonics, calculating a weighted index IH.M, and performing logic judgment on the weighted index IH.M, the number Nn.m of the characteristic current harmonics and set values IH.set and Nn.set to obtain a failure type. The influence of distributed capacitive current can be avoided, and the shortcomings of the conventional differential protection for the high-voltage direct current transmission line are overcome; and moreover, the method and the system are high in resistance to transition resistance, simple in operation, easy to implement and high in working speed and reliability, and special requirements on sampling frequency are avoided.

Description

technical field [0001] The present invention relates to a method and device in the technical field of relay protection for DC transmission lines in electric power systems, in particular to a characteristic harmonic-based HVDC transmission line protection method and system for EHV / UHV DC transmission lines. Background technique [0002] High-voltage direct current (HVDC) transmission occupies an important position in long-distance and high-power transmission because of its advantages such as large transmission power and good control performance. Developed countries in the world regard it as the main method for large-capacity, long-distance power transmission and asynchronous networking. means. In my country, since the completion of the Zhoushan DC transmission project in 1987, the number of DC transmission projects in my country has been increasing day by day. With the construction of a strong smart grid that "transmits power from west to east, mutual supply between north an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/52
Inventor 郑晓冬邰能灵杨光亮陈安鹏
Owner SHANGHAI JIAOTONG UNIV
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