Pilot protection method based on Spearman rank correlation coefficient

A level-related, longitudinal protection technology, applied to emergency protection circuit devices, fault detection according to conductor types, electrical components, etc., can solve problems such as poor protection performance, inability to operate correctly, and high-frequency component effects, and achieve reliable longitudinal connection The effect of protection

Active Publication Date: 2019-03-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In the frequency domain, the difference in the ratio of the differential voltage of the fault component to the differential current of the fault component can be used to distinguish the internal and external faults, but the method based on the power frequency is affected by the current frequency offset of the doubly-fed fan. In the time domain, one is to use whether the first-order derivative of the differential voltage and differential current conforms to the capacitance model to distinguish

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  • Pilot protection method based on Spearman rank correlation coefficient
  • Pilot protection method based on Spearman rank correlation coefficient
  • Pilot protection method based on Spearman rank correlation coefficient

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Embodiment Construction

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0015] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flow chart of the Spearman rank correlation coefficient-based longitudinal protection method provided by the embodiment of the present invention, and the method includes:

[0016] Step 1. According to the transient short-circuit current expressions of different types of power supplies,...

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Abstract

The invention discloses a pilot protection method based on Spearman rank correlation coefficient. The method comprises the following steps: firstly acquiring fault features of different types of supply transient current according to transient short-circuit current expressions of different types of power supply; measuring waveform difference of transient current at two sides when an internal of thenew energy terminal outgoing line occurs by utilizing the Spearman rank correlation coefficient; and distinguishing the internal and external faults according to the waveform difference of transientcurrent at two sides when the internal fault occurs, thereby realizing the pilot protection on the new energy terminal outgoing line. By utilizing the method disclosed by the invention, the internal and external faults can be reliably distinguished, and the reliable pilot protection on the new energy terminal outgoing line is realized.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a longitudinal protection method based on Spearman rank correlation coefficient. Background technique [0002] Large-scale new energy access has become an inevitable trend in the field of energy and power in my country. However, the fault characteristics of new energy power supply are affected by the low voltage ride-through control strategy, showing sequence impedance instability, phase angle control, frequency offset, high-order Harmonics and other characteristics, which make the traditional ratio brake differential protection a huge challenge, so the study of reliable new principles of longitudinal protection is of great significance for the efficient use of new energy. [0003] In the prior art, there are few research results on the longitudinal protection of outgoing lines, and the main methods focus on the two aspects of frequency domain and time domain. In the freque...

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085H02H7/26
Inventor 贾科杨哲郑黎明方煜毕天姝董雄鹰杨彬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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