Fault Traveling Wave Treatment Method for Flexible HVDC Transmission Lines
A transmission line, flexible direct current technology, applied in the direction of the fault location, fault detection according to the conductor type, measurement of electricity, etc., can solve the problem of damage to the converter station, relay protection cannot meet the requirements of the rapidity of flexible direct current transmission line protection, and it is difficult to distinguish Fault traveling wave high-frequency transient interference and other problems, to achieve the effect of eliminating the influence of DC and low-frequency signals
Active Publication Date: 2020-03-27
TSINGHUA UNIV +1
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Problems solved by technology
However, when a short-circuit fault occurs on the flexible DC transmission line, the excessive short-circuit current will permanently damage the power electronic devices of the converter station. Therefore, it is necessary to correctly identify the fault in a very short time after the fault occurs and open the DC circuit breaker to protect the converter. Station Power Electronics
The relay protection of traditional DC transmission lines cannot meet the requirements of flexible DC transmission lines for fast protection. The protection technology and fault technology based on traveling wave principle is an ideal choice to solve this problem.
[0003] However, the current analysis method of fault traveling wave takes a single fault traveling wave head as the research object, and lacks an in-depth analysis of the characteristics of the entire wave process; and only through a single fault traveling wave head, it is difficult to highlight the overall characteristics of the fault traveling wave concisely and effectively , it is difficult to distinguish between fault traveling waves and high-frequency transient disturbances
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[0063] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0064] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.
[0065] like figure 1 As shown, according to an embodiment of the present invention, a method for processing fault traveling waves of flexible direct current transmission lines is provided, including...
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The invention provides a method for processing the fault traveling wave of a flexible DC transmission line. The method comprises a step of obtaining the pole mode current and pole mode voltage fault transient traveling wave of the flexible DC transmission line, a step of obtaining a pole mode reverse voltage fault transient traveling wave, a step of obtaining the modulus maximum of the pole mode reverse voltage fault transient traveling wave, and obtaining the equivalent pole mode inverse voltage travelling wave of the pole mode reverse voltage fault transient traveling wave. According to the technical scheme of the invention, the difference between the fault traveling wave and high-frequency transient interference can be effectively displayed, thus the overall characteristic of a flexible DC transmission line fault is more simple and intuitive, the influences of direct current and low frequency signal in the pole mode reverse voltage fault transient traveling wave can be eliminated, the high frequency characteristic of a traveling wave process is highlighted, the analysis difficulty of a flexible DC system downgoing wave process is reduced, and the ultra high speed flexible DC transmission line protection is possible.
Description
technical field [0001] The invention relates to the technical field of relay protection and fault detection of power systems, in particular to a method for processing fault traveling waves of flexible direct current transmission lines. Background technique [0002] Compared with traditional DC transmission technology, flexible DC transmission technology has the advantages of low harmonic level, no commutation failure problem, no reactive power compensation problem, power supply for passive systems, and independent adjustment of active power and reactive power at the same time. It has broad application prospects in our country. However, when a short-circuit fault occurs on the flexible DC transmission line, the excessive short-circuit current will permanently damage the power electronic devices of the converter station. Therefore, it is necessary to correctly identify the fault in a very short time after the fault occurs and open the DC circuit breaker to protect the converte...
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IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 董新洲汤兰西施慎行王宾庞辉孔明贺之渊杨杰裴翔羽
Owner TSINGHUA UNIV